Head support assembly and support unit

Abstract

A support unit for a modular head support assembly having a right support post and a left support post, said support unit comprising: a support body; a right attachment element and a left attachment element configured for articulation with said right support post and said left support post, respectively, said right attachment element and said left attachment element being disposed at opposite sides of the support body; and an adjustment mechanism configured for selectively adjusting the position of the right attachment element and the left attachment element with respect to each other, at least from an extended position towards a retracted position.

Claims

1. A support unit for a modular head support assembly having a right support post and a left support post, said support unit comprising: a support body; a right attachment element and a left attachment element configured for articulation with said right support post and said left support post, respectively, said right attachment element and said left attachment element being disposed at opposite sides of the support body; and an adjustment mechanism configured for selectively adjusting a position of the right attachment element and the left attachment element with respect to each other, at least from an extended position towards a retracted position, wherein the adjustment mechanism is configured to simultaneously adjust the position of both the right attachment element and the left attachment element.

2. The support unit of claim 1, wherein said adjustment mechanism further comprises a fixing mechanism configured to prevent said right attachment element and said left attachment element from being adjusted at least from any one intermediate position from a plurality of intermediate positions towards the extended position.

3. The support unit of claim 2, wherein said fixing mechanism configured to fix said right attachment element and said left attachment element at any one intermediate position from a plurality of intermediate positions between the extended position and the retracted position.

4. The support unit of claim 1, wherein the adjustment mechanism is configured for adjusting the position of the right attachment element and the left attachment element with respect to each other between the extended position and the retracted position.

5. The support unit of claim 1, wherein the support body has a longitudinal axis, and the position of the right attachment element and the left attachment element with respect to each other is linearly adjustable along said longitudinal axis.

6. The support unit of claim 5, wherein the adjustment mechanism extends at least partially along said longitudinal axis.

7. The support unit of claim 5, wherein the adjustment mechanism extends at least partially within said support body.

8. The support unit of claim 1, wherein at the retracted position, a distance between the right attachment element and the left attachment element is a first distance, and at the extended position, a distance between the right attachment element and the left attachment element is a second distance which is greater than the first distance.

9. The support unit of claim 1, wherein the simultaneous adjustment of the position of the right attachment element and the left attachment element is such that the right attachment element and the left attachment element are displaced at the same distance.

10. The support unit of claim 1, wherein the right attachment element and the left attachment element are disposed at opposite sides of the support body via a right extending element and a left extending element, respectively.

11. The support unit of claim 10, wherein the adjustment mechanism is configured to adjust and fix said right attachment element and said left attachment element with respect to each other by adjusting and fixing the right extending element and said left extending element with respect to the support body.

12. The support unit of claim 10, wherein the adjustment mechanism comprises: right and left drive elements, oppositely disposed to one another along the length of the right extending element and the left extending element, respectively; and a driving gear comprising a driving portion engaged with both of the right and left drive elements.

13. The support unit of claim 12, wherein the right extending element comprises a right elongate opening formed therein, said right elongate opening comprises a right upper rim and a right lower rim, and the right drive element extends on one of the right upper and lower rim; the left extending element comprises a left elongate opening formed therein, said left elongate opening comprises a left upper rim and a left lower rim, and the left drive element extending along the opposite rim to the rim on which the right drive element extends along; and wherein said driving portion is extending through both the right elongate opening and the left elongate opening.

14. The support unit according to claim 1, wherein said support body is configured with a front portion to which a head restraint is attachable.

15. The support unit according to claim 1, wherein the support body comprises a handle, extending upwards and spaced from a top portion of the support body, forming a gap therebetween.

16. The support unit according to claim 1, wherein the support body comprises a lower section having at least one aperture disposed thereon.

17. The support unit according to claim 1, wherein said adjustment mechanism is configured for selectively adjusting the position of the right attachment element and the left attachment element by displacing or facilitating displacement thereof.

18. The support unit according to claim 1, wherein the support body comprises a right body member connected to the right attachment element at a right end thereof, and a left body member connected to the left attachment element at a left end thereof, said right body member and said left body member are pivotally articulated to one another by the adjustment mechanism; and wherein pivotal displacement of the right body member with respect to the left body member is configured for selectively adjusting the position of the right attachment element and the left attachment element with respect to each other, between the extended position and the retracted position.

19. The support unit according to claim 1, wherein each one of the right and left attachment elements comprises a mounting bore configured for receiving therein a section of the respective support post.

20. A support unit for a modular head support assembly having a right support post and a left support post, said support unit comprising: a support body; a right attachment element and a left attachment element configured for articulation with said right support post and said left support post, respectively, said right attachment element and said left attachment element being disposed at opposite sides of the support body; and an adjustment mechanism configured for selectively adjusting a position of the right attachment element and the left attachment element with respect to each other, at least from an extended position towards a retracted position; the right attachment element and the left attachment element are disposed at opposite sides of the support body via a right extending element and a left extending element, respectively; wherein the adjustment mechanism comprises: right and left drive elements, oppositely disposed to one another along the length of the right extending element and the left extending element, respectively; and a driving gear comprising a driving portion engaged with both of the right and left drive elements.

21. A support unit for a modular head support assembly having a right support post and a left support post, said support unit comprising: a support body; a right attachment element and a left attachment element configured for articulation with said right support post and said left support post, respectively, said right attachment element and said left attachment element being disposed at opposite sides of the support body; and an adjustment mechanism configured for selectively adjusting a position of the right attachment element and the left attachment element with respect to each other, at least from an extended position towards a retracted position; wherein the support body comprises a handle, extending upwards and spaced from a top portion of the support body, forming a gap therebetween.

22. A support unit for a modular head support assembly having a right support post and a left support post, said support unit comprising: a support body; a right attachment element and a left attachment element configured for articulation with said right support post and said left support post, respectively, said right attachment element and said left attachment element being disposed at opposite sides of the support body; and an adjustment mechanism configured for selectively adjusting a position of the right attachment element and the left attachment element with respect to each other, at least from an extended position towards a retracted position; wherein the support body comprises a right body member connected to the right attachment element at a right end thereof, and a left body member connected to the left attachment element at a left end thereof, said right body member and said left body member are pivotally articulated to one another by the adjustment mechanism; and wherein pivotal displacement of the right body member with respect to the left body member is configured for selectively adjusting the position of the right attachment element and the left attachment element with respect to each other, between the extended position and the retracted position.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In order to better understand the subject matter that is disclosed herein and to exemplify how it may be carried out in practice, embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:

(2) FIG. 1A illustrates a rear perspective view of a foldable wheelchair fitted with a modular head support assembly fitted with a head support unit with its right attachment element and left attachment element at an intermediate position, according to one example of the presently disclosed subject matter;

(3) FIG. 1B illustrates the wheelchair of FIG. 1A with the head support assembly at a position lower than in FIG. 1A;

(4) FIG. 1C illustrates the wheelchair of FIG. 1B at a collapsed position, with the support unit removed;

(5) FIG. 2 is an exploded view of the head support assembly of FIG. 1A;

(6) FIG. 3A illustrates a rear perspective view of a support unit of the head support assembly of FIG. 1A, with its right attachment element and left attachment element at a retracted position, and with its driving gear at a locked state;

(7) FIG. 3B is a cross-sectional view along line A-A in FIG. 3A;

(8) FIG. 3C is a cross-sectional view along line B-B in FIG. 3A;

(9) FIG. 3D is a cross-sectional view along line C-C in FIG. 3A;

(10) FIG. 4A illustrates the support unit of FIG. 3A, with the driving gear at an unlocked state;

(11) FIG. 4B is a cross-sectional view along line D-D in FIG. 4A;

(12) FIG. 4C is a cross-sectional view along line E-E in FIG. 4A;

(13) FIG. 5A illustrates a rear perspective view of a support unit of FIG. 3A, with its right attachment element and left attachment element at an extended position;

(14) FIG. 5B is a cross-sectional view along line F-F in FIG. 5A;

(15) FIG. 6A illustrates a rear left perspective view of a support post and a coupler unit of the head support assembly of FIG. 1B, with a top section of the support post extending above the coupler unit;

(16) FIG. 6B illustrates the support post and the coupler unit of FIG. 6A, with the top section at lower position than in FIG. 6A;

(17) FIG. 7 illustrates a rear perspective view of a foldable wheelchair fitted with a modular head support assembly according to another example of the presently disclosed subject matter, with its support posts retracted and support unit removed;

(18) FIG. 8 is a rear perspective view of the wheelchair of FIG. 7, with the support posts projecting up;

(19) FIG. 9 is a rear perspective view of the wheelchair of FIG. 7, with the support unit mounted on the support posts;

(20) FIG. 10 illustrates a first step of folding the wheelchair of FIG. 7;

(21) FIG. 11A illustrates the wheelchair of FIG. 7 at a folded position;

(22) FIG. 11B illustrates the wheelchair of FIG. 9 at a folded position;

(23) FIG. 12A is front perspective view of a portion of the wheelchair of FIG. 9, the restraining member at an upward, open position;

(24) FIG. 12B is front perspective view of a portion of the wheelchair of FIG. 9, the restraining member at a closed, restraining position;

(25) FIG. 13 is a bottom perspective view of the head support unit of FIG. 9;

(26) FIG. 14A illustrates a rear perspective view of a foldable wheelchair fitted with a modular head support assembly according to yet another example of the presently disclosed subject matter, with its support posts retracted and head support unit removed;

(27) FIG. 14B illustrates a first step of folding the wheelchair of FIG. 14A;

(28) FIG. 15A illustrates the wheelchair of FIG. 14A with a top portion of the support posts folded;

(29) FIG. 15B illustrates the wheelchair of FIG. 8A at a fully folded position;

(30) FIG. 16 illustrates a perspective view of the modular head support assembly;

(31) FIG. 17A illustrates a rear perspective view of a foldable wheelchair fitted with a modular head support assembly fitted with an upper support unit and a lower support unit with their right attachment element and left attachment element at an intermediate position, respectively, according to yet another example of the presently disclosed subject matter;

(32) FIG. 17B illustrates the wheelchair of FIG. 17A with the head support assembly at a position lower than in FIG. 17A and with the wheelchair at a collapsed position, and with the upper support unit removed;

(33) FIG. 17C illustrated a perspective view of the lower support unit of FIG. 17A, with its right attachment element and left attachment element at an extended position with respect to its pivotal adjustment mechanism of the lower support unit, and with its right attachment element and left attachment element at a retracted position with respect to its linear adjustment mechanism of the lower support unit;

(34) FIG. 17D illustrated a perspective view of the lower support unit of FIG. 17A, with its right attachment element and left attachment element at a retracted position with respect to its pivotal adjustment mechanism of the lower support unit, and with its right attachment element and left attachment element at a retracted position with respect to its linear adjustment mechanism of the lower support unit;

(35) FIG. 17E illustrated a perspective view of the lower support unit of FIG. 17A, with its right attachment element and left attachment element at an extended position with respect to its pivotal adjustment mechanism of the lower support unit, and with its right attachment element and left attachment element at an extended position with respect to its linear adjustment mechanism of the lower support unit;

(36) FIG. 17F is a cross-sectional view along line G-G in FIG. 17C; and

(37) FIG. 17G is a cross-sectional view along line H-H in FIG. 17E.

DETAILED DESCRIPTION OF EMBODIMENTS

(38) Attention is first made to FIGS. 1 to 6B of the drawings, directed to a first example of head support assembly according to the present disclosure, generally designated 10, mounted on a seat in the form of a generic type wheelchair, generally designated 14.

(39) The wheelchair 14 is a collapsible wheelchair of the type comprising a right side frame 18 and a left side frame 20 articulated to one another by a collapsible X-shaped cross-frame 24, each side frame mounted over a large rear wheel 26 and a front caster wheel 28, with a foldable seat 30 and a foldable backrest 32 extending between the right side frame 18 and the left side frame 20. The wheelchair 14 is collapsible between a collapsed position (shown in FIG. 1C) and a deployed position (shown in FIGS. 1A and 1B).

(40) Whilst a specific wheelchair is illustrated in the annexed drawings, it is appreciated that other types and shapes of wheelchairs can be used as well.

(41) The head support assembly 10 is a modular system that can be configured as an add-on assembly for mounting on a wheelchair, or pre-fitted on a wheelchair.

(42) In the examples of FIGS. 1 to 6B, the head support assembly 10 comprises a pair of support posts, namely a right support post 40 and a left support post 42, configured for attaching to the right side frame 18 by a right coupler unit 46, and to the left side frame 20 by a left coupler unit 48, respectively. The right coupler unit 46 and the left coupler unit 48 are configured for facilitating sliding displacement of the right support post 40 left support post 42 therein between an upper position shown in FIG. 1A and a lower position shown in FIGS. 1B and 1C, and for fixing the right and left support posts 40 and 42 at any position between the upper position and the lower position.

(43) The head support assembly 10 further comprises a head support unit 50 having a support body 52 with a front portion 53, a rear portion 54, a right opening 55, a left opening 56, and a tunnel 57 extending between the right opening 55 and the left opening 56 along a longitudinal axis X. The head support unit 50 is configured for providing support for a head of a user 12 seated on the wheelchair 14. Since the head support unit 50 is not foldable, it first has to be detached from the right and left support posts 40 and 42 bringing the wheelchair 14 to its collapsed position shown in FIG. 1C.

(44) As shown in FIGS. 1A and 1B, a head restraint 2 is attached to the support body 52 and is disposed in front of the front portion 53. The head restraint 2 is configured for providing improved head and neck support to the user 12 while seated in the wheelchair 14, e.g., in case the user falls asleep or in case of an individual with physical disorders. More particularly, the head restraint 2 is configured for preventing the user's head from falling forward, and furthermore, for preventing the user's head from tilting to the left or the right side. This provides comfortable and stable support of the user's head while sitting on the wheelchair 14.

(45) According to the particular example of FIGS. 1A and 1B, the head restraint 2 is the one disclosed in U.S. Pat. No. 9,566,885, the content of which is incorporated herein by reference. The head restraint 2 comprise: a headrest member 3 configured with a back portion 4 and two side portions 5 and 6 extending therefrom. The side portions 5 and 6 are foldable with respect to the back portion 4 so as to allow the headrest member to assume a first state in which the side portions 5 and 6 are spaced from each other at a first extent and a second state in which the side portions 5 and 6 are spaced from each other to a second extent which is smaller than the first extent. The head restraint 2 further comprises a mounting arrangement 7 including a hook and pile fastener (Velcro™) for detachably attaching the head restraint 2 to the support body 52. The head restraint 2 further comprises a restraining member 8 pivotally articulated to the side portions 5 and 6 for rotation at least between an upward position and a downward position, wherein displacement of the restraining member 8 between its upward position (not shown) and its downward position (shown in FIGS. 1A and 1B) is configured to cause the headrest member 3 to assume its first and second states, respectively. In use, when the user's head is positioned at the head restraint 2, the restraining member 8 at its upward position can be located substantially above the use's head, and in its downward position, the restraining member 8 is located in front of the user's forehead.

(46) The head support unit 50 comprises a right attachment element 60 and a left attachment element 70 configured for articulation at top portions of the right support post 40 and the left support post 42, respectively. The right attachment element 60 and the left attachment element 70 are disposed at opposite sides of the support body 52. The head support unit 50 further comprises an adjustment mechanism 80 configured for selectively adjusting and fixing the position of the right attachment element 60 and the left attachment element 70 with respect to each other between an extended position (shown in FIGS. 5A and 5B) and a retracted position (shown in FIGS. 3A to 4C).

(47) The adjustment of the position of the right attachment element 60 and the left attachment element 70 is performed by linearly displacing to and from each other along the longitudinal axis X extending along the support body 52.

(48) As shown in FIGS. 1A to 2, the right support post 40 and the left support post 42 extend vertically upwards in parallel to each other, defining a certain distance therebetween. When the right support post 40 and the left support post 42 are attached to the right and left side frame members 18 and 20, the distance therebetween is dictated by the width of the wheelchair 14, and in particular, by the structure and the distance between the right and left side frame members 18 and 20 of the wheelchair 14. This distance can change from one seat to another, or be dependent on the locations at which the right and left posts are articulated to the side frame of a particular seat. Thus, the right attachment element 60 and the left attachment element 70 are adjustable with respect to each other in order to detachably attach the head support unit 50 to the right and left support posts 40 and 42 and to fixedly fit the distance therebetween and respectively between right and left side frame members 18 and 20. This adjustment enables the right attachment element 60 and the left attachment element 70 to fixedly assume any one intermediate position from a plurality of intermediate positions between the extended position and the retracted position. In the example of FIGS. 1A and 1B, the right attachment element 60 and the left attachment element 70 are fixedly adjusted to an intermediate position which fits the distance between the right support post 40 and the left support post 42, dictated by the distance between the right and left side frames 18 and 20 at the deployed position of the wheelchair 14.

(49) Reference is now made particularly to FIGS. 2 to 5B, illustrating the head support assembly, and different parts thereof. As mentioned above, the right attachment element 60 and the left attachment element 70 are adjustable between the extended position (shown in FIGS. 5A and 5B) and the retracted position (shown in FIGS. 3A to 4C) by displacing them along the longitudinal axis, so that at the retracted position, the distance between the right attachment element 60 and the left attachment element 70 is a minimal first distance D1, and at the extended position, the distance between the right attachment element 60 and the left attachment element 70 is a maximal second distance D2 which is greater than the first distance D1. As shown in FIGS. 3A and 3B, at the retracted position, the right attachment element 60 and the left attachment element 70 are adjacently positioned to opposite lateral sides of the head support body 52. At the intermediate position, the right attachment element 60 and the left attachment element 70 shown in FIGS. 1A and 1B, are spaced from each other to a third distance D3 which is greater than D1 and smaller than D2.

(50) The adjustment mechanism 80 extends at least partially within the support body 52 and is configured to simultaneously displace the right attachment element 60 and the left attachment element 70 with respect to each other and with respect to the head support body 52. The simultaneous adjustment of the position of the right attachment element 60 and the left attachment element 70 is such that upon operation of the adjustment mechanism 80, the right attachment element 60 and the left attachment element 70 are displaced at the same distance. Moreover, the head support body 52 is symmetrical and the right attachment element 60 and the left attachment element 70 are disposed at equal distances from the center thereof at their various positions between the extended position and the retracted position. The adjustment mechanism 80 is operable by a user to increase or decrease the distance between the right attachment element 60 to the left attachment element 70, so that a single operation of the user adjusts and displaces both of the right attachment element 60 and the left attachment element 70, either towards the extended position and/or towards the retracted position.

(51) As sown in FIG. 2, the right attachment element 60 and the left attachment element 70 are connected at opposite sides of the head support body 52 via a right extending element 62 and a left extending element 72, respectively, both slidable within the tunnel 57 and constituting part of the adjustment mechanism 80. The adjustment mechanism 80 is configured to displace and fix the right attachment element 60 and the left attachment element 70 at a plurality of positions by displacing and fixing the right extending element 62 and the left extending element 72 with respect to the head support body 52.

(52) The right extending element 62 comprises a top and a bottom right slide members 65 and 67 and the left extending element 72 comprises a top and a bottom left slide members 75 and 77 slidably secured to the top and the bottom right slide members 65 and 67. The tunnel 57 has a complementary shape to the shape of the right extending element 62 and the left extending element 72 slidably secured together.

(53) The right extending element 62 comprises a right elongate opening 63 formed therein with a right upper rim 64 having a right drive element in the form of teeth extending therefrom and constituting an upper rack 84.

(54) The left extending element 72 comprises a left elongate opening 73 formed therein with a left lower rim 74 having a left drive element in the form of teeth extending therefrom and constituting a lower rack 86. The adjustment mechanism 80 comprises the upper rack 84, the lower rack 86, and a driving gear 87 comprising a driving portion in the form of a pinion 88 engaged with both of the upper rack 84 and the lower rack 86 and extending through the right elongate opening 63 and the left elongate opening 73.

(55) The right elongate opening 63 further comprises right distal rim 66 and a right proximal rim 68, with the upper rack 84 extending therebetween. The left elongate opening 73 further comprises a left distal rim 76 and a left proximal rim 78, with the lower rack 86 extending therebetween.

(56) The right and left distal rims 66 and 76 are situated closest to their respective attachment elements, and are configured to determine the retracted position (shown in FIG. 3B), at which the pinion 88 engages the distal rims 66 and 76, thereby delimiting further displacement of both the right and left attachment elements 60 and 70. Also, at the extended position (shown in FIG. 5B) the pinion 88 engages the right proximal rim 68 and the left proximal rim 78 delimiting further displacement of both the right and left attachment elements 60 and 70.

(57) The driving gear 87 comprises a rotatable handle 89 for configured to be gripped by a user and rotated towards a clockwise direction for adjustment of the right and left attachment elements 60 and 70 from the retracted position towards the extended position, and rotated towards a counterclockwise direction for adjustment of the right and left attachment elements 60 and 70 from the extended position towards the retracted position.

(58) As mentioned above, the adjustment mechanism 80 is further configured for fixing the position of the right attachment element 60 and the left attachment element 70 with respect to each other. The adjustment mechanism 80 thus comprises a fixing mechanism 90 configured to fix the right attachment element 60 and the left attachment element 70 at any one intermediate position from a plurality of intermediate positions between the extended position and the retracted position.

(59) The fixing mechanism has a latch portion 92 (shown in FIGS. 3C, 3D and 4C) in the form of teeth formed in the handle 89, selectively engageable with a locking portion 94 of the head support body 52 (shown in FIGS. 2, 3C, 3D and 4C) formed as depressions. The teeth of the locking portion 94 are designed in a complementary manner to the depressions of the latch portion 92, such that when the locking portion 94 is displaced into engagement with the latch portion 92, the locking portion 94 is flush with the latch portion 92 and is prevented from movement. This state of the fixing mechanism 90 is shown in FIGS. 3A to 3D and 5A to 5B, and is considered as a locked state of the fixing mechanism 90. The number of teeth and depressions and the spacing therebetween determines the number of the discrete positions (e.g., intermediate positions) and the difference between the positions.

(60) Thus, the fixing mechanism 90 is configurable between:

(61) a locked state (shown in FIGS. 3A to 3D and 5A to 5B), at which the latch portion 92 is engage with the locking portion 94, so as to prevent the driving gear from rotation, and fixing the respect position of the right and left attachment elements 60 and 70; and

(62) an unlocked state (shown in FIGS. 4A to 4C), at which the latch portion 92 is disengaged from the locking portion 94, so as to enable rotation of the driving gear 87.

(63) The fixing mechanism 90 is configurable between the locked state and the unlocked state by being slidably displacing the driving gear 87 towards and away from the head support body 52 perpendicularly to the longitudinal axis X, by pulling and pushing the handle 89 by the user, towards and away from the head support body 52.

(64) For example, in order to displace the right attachment element 60 and the left attachment element 70 from their retracted position of FIG. 3A, at which the fixing mechanism 90 is at the locked state, the handle 89 has first to be pulled by the user away from the head support body 52. This causes the fixing mechanism 90 to assume its unlocked state, as shown in FIGS. 4A to 4C. Only at this unlocked states, the latch portion 92 is disengaged from the locking portion 94, and the user can rotate the handle 89 in the clockwise direction, so as to rotate the driving gear 87. During the rotation of the handle 89, the distance between the right attachment element 60 and the left attachment element 70 is decreased, and they pass through a plurality of intermediate positions. At any intermediate position, at which the wanted distance is obtained, the handle 89 is pushed towards the head support body 52, causing the fixing mechanism 90 to assume its locked state. FIGS. 5A and 5B shown the extended position of the right attachment element 60 and the left attachment element 70, as which the fixing mechanism 90 is at its locked state.

(65) Reference is now made particularly to FIGS. 2, 3B, 6A and 6B in order to describe the structure of the left support post 42 and its articulation manner to the left attachment element 70 and to the left side frame 20 by the left coupler unit 48. Since the right support post 40 has the same structure and functionality, the description with respect to the left support post 42 is similarly relevant with respect to the right support post 40.

(66) The left attachment element 70 comprises a mounting bore 71 configured for receiving therein a top section 44 of the left support post 42. The mounting bore 71 comprises a bore opening 71′ formed at a bottom surface of the left attachment element and configured for receiving therethrough the top section 44. The left attachment element 70 comprises a securing element 79 in the form of a magnet disposed at an internal end of the mounting bore 71 for magnetically detachably attaching to a magnetically attractable member 43 of the left support post.

(67) The left coupler unit 48 comprises: a support post receiving member 49 formed as a vertically positioned pipe for receiving therethrough the left support post 42 and facilitating sliding displacement of the left support post 42 in an up/down orientation; a mounting mechanism 36 attachable to the left side frame member 20; and a height fixing mechanism in the form of a lock fastener 38 configured for selectively arresting the left support post 42 with respect to the left support post receiving member 49. The lock fastener 38 is configured for allowing and preventing elevation of the left support post 42 at any desired elevation, between an upward position (FIG. 1A and a downward position (FIG. 1B), whereby any intermediate elevation can be set too. The support posts can thus be height adjustable, so as to adjust the height at which the support unit extends with respect to the backrest of the wheelchair 14.

(68) The mounting mechanism 36 comprises a first frame engaging section 36a and a complementary second frame engaging section 36b configured for tightly receiving therebetween the left side frame member 20. The first frame engaging section 36a and the second frame engaging section 36b is tightly attached to each other. Each one of the first frame engaging section 36a and the second frame engaging section 36b comprises a depression formed at a frame engaging side thereof, and a first and second elastomer unit 36c and 36d extending through the length of the depression. The first and second elastomer unit 36c and 36d are configured to enable the mounting mechanism 36 for receiving a diversely formed side frame member therebetween. The first and second elastomer unit 36c and 36d are configured to mediate different designs of the side frame members, so as to tightly receive the side frame member therebetween regardless of the design differences.

(69) As shown in FIGS. 6A and 6B, the left support post comprises a shock absorber 33 formed at the top section 44. The shock absorber 33 is disposed within the top section 44 to which the left attachment element 40 is attachable. The shock absorber 33 is configured to be used to mitigate damages to the head support unit 50 attached thereon in case the right and left support posts 40 and 42 fall down fast. Additionally, the shock absorber 33 is configured to be used to substantially level the top section 44 of the left support post 42 with the left coupler unit 48, as shown in FIG. 6B.

(70) The left shock absorber 33 comprises a spring mounting member 44a disposed within the upper part of the top section 44, an external stopper 44b wider than the left support post 42 and wider than the support post receiving member 49 and displaceable towards and from the spring mounting member 44a along a stopper track 44c disposed vertically below the spring mounting member 44a, and a spring 44d interconnecting the spring mounting member 44a and the external stopper 44b. Upon engagement of the external stopper 44b with the support post receiving member 49, the external stopper 44b cannot pass though the support post receiving member 49. This position is shown in FIG. 6A. Further pulling of the left support post 42 in the downward direction, causes the spring mounting member 44a to be displaced towards the external stopper 44b and to engage it. At this position, which is shown in FIG. 6B, the top section 44 does not extend above the left coupler unit 48. The spring 44d is configured for normally biasing the stopper 44b away from the spring mounting member 44a along the stopper track 44c. Thus, the stopper 44b is positioned by default at the bottom of the top section 44. For example, when the stopper 44b is being pushed upwards along the stopper track 44c, the spring applies compression forces on the stopper 44b entailing the stopper 44b to revert back to the bottom of the top section 44.

(71) The stopper track 43c is disposed below the spring mounting member 44a and extends to a distance corresponding to the length of the left mounting bore 71. Thus, when the left support post 42 is inserted to the coupler unit at the position of FIG. 6A, the head support unit 50 can still be attached on the top section 44, which extends above the left coupler unit 48.

(72) The head support body 52 comprises a handle 58, extending upwards and spaced from a top portion of the head support body 52, forming a gap therebetween. The gap is designed such that at least one upper strap of the head restraint 2 can extend through the gap for securing the head restraint 2 to the head support body 52.

(73) The head support body 52 comprises a lower section having a plurality of lateral apertures 52′ disposed thereon and to which a plurality of convenient devices are attachable. Such convenient devices can comprise articulating arms for supporting beverages and the like.

(74) Attention is now made to FIGS. 7 to 13 and 16 of the drawings, directed to another example of wheelchair head support assembly according to the present disclosure, generally designated 110, mounted on a generic type wheelchair generally designated 114.

(75) The wheelchair 114 is foldable wheelchair of the type comprising a right side frame 118 and a left side frame 120 articulated to one another by a collapsible X-shaped cross-frame 124, each side frame mounted over a large rear wheel 126 and a front caster wheel 128, with a foldable seat 130 and a foldable backrest 132 extending between the right side frame 118 and the left side frame 120. Each of the right side frame 118 and the left side frame 120 is configured with an upright rear bar 135.

(76) Whilst a specific wheelchair is illustrated in the annexed drawings, it is appreciated that other types and shapes of wheelchairs can be used as well.

(77) The head support assembly 110 is a modular system that can be configured as an add-on assembly for mounting on a wheelchair, or pre-fitted on a wheelchair.

(78) In the first example, the head support assembly 110 comprises a pair of support posts, namely a right support post 140 and a left support post 142, each configured for attaching to a respective upright rear bar 135 of the wheelchair 114, by a coupler unit 146 articulated to the upright rear bar 135. The coupler unit 146 comprises a support post channel through which the respective support post is slidably displaceable in an up/down orientation. A secondary support unit 147 is configured below each coupler unit 146, slidingly accommodating a support post, wherein a set screw 149 is provided at coupler unit 146 for fixing elevation of the support posts at any desired elevation, between a fully retracted position (FIG. 7) and a fully extended position (FIG. 8), whereby any intermediate elevation can be set too.

(79) It is however appreciated that the support posts are retained and articulated to the respective upright bars of the wheelchair at a fashion facilitation rotational displacement of the support posts about their longitudinal axis during folding the wheelchair. Accordingly, the coupler unit 146 and the secondary support unit 147 facilitate rotation of the support posts 140 there within.

(80) As noted, the support posts are height adjustable by the set screw. However, according to another embodiment (not shown) the support posts can be preset at a fixed elevation above the back rest 132. According to yet an embodiment (not shown), elevation of the support posts can set by a telescopic arrangement comprising two or more support post segments axially displaceable and arrested by a height fixating mechanism. Likewise, the height fixating mechanism can be a snap lock fastener, or the support posts can be height adjustable by a combined height adjusting mechanism comprising a telescopic assembly and a fastener arrangement associated with the side frames.

(81) It is appreciated that the coupler unit 146 and the secondary support unit 147 can be detachable attachable to the respective upright rear bars 135, for removal of the head support assembly 110. Alternatively, the head support assembly 110 can be removed from the wheelchair 114 by fully sliding out the right support post 140 and a left support post 142 and removing same.

(82) The head support assembly 110 is further configured with a bottom bar 150 extending between respective bottom ends of the support posts 140 (imparting it a right angled U-like frame shape), the bottom bar 150 extending at a substantially right angle with respect to the support posts 140, and is configured with a left bar member 152 extending from a bottom of the left support post 142, and a right bar member 154 integrally extending from a bottom of the right support post 140, wherein the left bar member 152 and right bar member 154 are pivotally articulated to one another through a coupler member 156 with a pivot axis X extending substantially parallel to the support posts 140 and 142 (FIGS. 1 and 2). Noticeable, where the wheelchair is non-foldable, the bottom bar 150 can be a solid member. furthermore, the left bar member 152 and right bar member 154 can be articulated with the respective bottom left support post 142 and bottom of the right support post 140 (as opposed to being integral therewith).

(83) The coupler member 156 can be configured with a locking mechanism to prevent unintended collapsing of the bottom bar 150, or it can be configured as a toggle type mechanism retaining it at the expanded position. However, it is advantageous that the coupler member 156 can be readily collapsed e.g. by a user's foot as exemplified by in FIG. 4, assisting in collapsing/folding of the wheelchair 114.

(84) Also, the left bar member 152 and right bar member 154 of the bottom bar (and similarly of a top bar if provided) can be coaxially extendible (exemplified by arrow 155 in FIG. 7) so as to adjust to varying wheelchair width. Extension of the top bar and the bottom bar can be by a telescopic extension mechanism.

(85) It is noted that at the lowermost position of the head support assembly 10 (FIGS. 7, 11A, 15A) the top end of the support posts 140 and 142 extends in close proximity with a top surface of the coupler unit 146. According to a particular example, the coupler unit 146 is configured with a cutout portion 147 (best seen in FIGS. 10, 12A and 12B) such that at the lowermost position of the head support assembly 110, the top ends of the support posts 140 and 142 are flush with a top of the coupler unit 146 (and with the push handles 151 of the wheelchair 114).

(86) A flexible head support unit 170 (FIGS. 9, 12, 13) is attachable over top portions 140T and 142T of the support posts 140 and 142, respectively. The head support unit 170 comprises a head support body 172 configured at respective side ends thereof with a pair of right and left attachment elements 174 configured for mounting over a top portion 140T and 142T, of the support posts 140 and 142, respectively. An adjustment mechanism in the form of a pair of fastening straps 178 is provided for adjusting the distance between the attachment elements 174 at least from an extended position towards a retracted position by tightening the straps 178. When the head support unit 170 is mounted on the over top portions 140T and 142T, the pair of fastening straps 178 is configured for tensioning the head support unit 170 over the top portions 140T and 142T, thereby causing the attachment elements 174 to deform and to approach each other. It is appreciated that in other examples, the flexible head support body 172 can be formed as a rigid member with the flexible right and left attachment elements 174.

(87) As shown in FIG. 13, tightening the straps 178 causes the attachment elements 178 to approach each other, and the distance therebetween to be decreased. Moreover, the straps 178 have a fixing mechanism in the form of a latch 179, configured for preventing the attachment elements 178 to be adjusted from any intermediate position (shown in FIG. 9) towards their extended position.

(88) The flexible head support unit 170 is configured at a front portion 175 thereof with an integrally mounted head restraint 173 configured with a back portion 180 and two side portions 182 extending therefrom, the side portions 182 are foldable with respect to the back portion 180 so as to allow the head restraint 173 to assume a first state in which the side portions 182 are spaced from each other at a first extent, (open position as in FIG. 12A) and a second state in which the side portions are spaced from each other to a second extent which is smaller than the first extent (closed position as in FIG. 12B). A flexible restraining member 184 is pivotally articulated to the side portions 182 and is configured for rotation at least between an upward position (FIG. 12A) and a downward position (FIG. 12B), wherein displacement of the restraining member 184 between its upward position and its downward position is configured to cause the restraining member 184 to assume its first and second states, respectively.

(89) The head restraint 173 is integral with the head support unit 170 or it can be detachably attached thereto, e.g. by a hook and pile fastener (Velcro™) facilitating fine adjusting of elevation and angularity of the head restraint 173, so as to suit particular needs of an individual occupying the wheelchair.

(90) At an operative, unfolded position of the wheelchair 110, the support posts extend upright with the top portions 140T and 142T extending above a top edge of the back rest 132, at a an adjustable projection, with the flexible head support unit 170 tensioned therebetween. When it is required to adjust elevation of the head support unit 170 all that is required is to loosen the set screws 149 of the coupler units 146 and then pull/push the support posts frame to assume the required elevation. Tensioning the straps 78 of the head support unit 170 increases stability and rigidity of the U-shaped frame constructed by the support posts and bottom bar.

(91) Folding the wheelchair 110 takes place simply by collapsing the left bar member 152 and the right bar member 154 by displacement of the coupler member 156 forwards, in direction of arrow F (FIG. 4), e.g. by the foot of an individual. Once the left bar member 152 and the right bar member 154 are collapsed, the wheelchair 114 will be easily collapsed as known per-se, into the fully collapsed position of FIG. 11B, with the head support unit 170 collapsing accordingly. If required (e.g. for reducing overall space of the folded wheelchair such as when storing or mounting into a vehicle), the head support unit 170 can be removed and the support posts 140 and 142 can be retracted (FIG. 5A).

(92) As can be seen, at the folded position (FIGS. 11A and 11B) the left bar member 152 and the right bar member 154 extend substantially parallel to one another and within the space between the wheels 126 of the wheelchair. At a fully expanded position (FIGS. 7, 8 and 16) the left bar member 152 and the right bar member 154 substantially coextend.

(93) It is further appreciated that one or more intermediate bars (not shown) can extend between the support posts 140 and 142, each of the intermediate bars comprising a left bar member and a right bar member, respectively, and are coupled to one another by a coupler similar to coupler 156 as disclosed hereinabove, facilitating their collapsing. Such additional couplers are disposed coaxially with respect to coupler 156, pivotally about axis X, to facilitate folding of the structures.

(94) Further attention is now being directed also to FIGS. 14 and 15 of the drawings, illustrating an embodiment of the disclosure. The difference in the currently disclosed embodiment resides in the provision of a foldable top segment at a top of the support posts. Accordingly, like elements are designated with like reference numbers, however shifted by 100.

(95) The top segments 240T and 242T are foldable with respect to the support posts 240 and 242, respectively, through a pivot coupler 211. Pivot coupler 211 can be configured with a locking mechanism configured to prevent unintentional folding of the top segments. A top bar 215 is configured with a left bar member 217 extending from an upper portion of the left support post 242, and a right bar member 219 extending from an upper portion of the right support post 240, wherein the left bar member 217 and right bar member 219 are pivotally articulated to one another through a coupler member 256 with a pivot axis X extending substantially parallel to the support posts 240 and 242 and coextending with the axis X of the bottom bar 250.

(96) The arrangement is such that the flexible head support unit 170 (as disclosed hereinabove) is mountable over the foldable top segments 240T and 242T. In use, the foldable top segments 240T and 242T can be folded albeit positioning of the flexible head support unit 170, wherein at the folded position of the wheelchair (FIG. 15B) the left bar member 217 and a right bar member 219 extend substantially parallel forwards from the support posts 240 and 242, whist the top segments 240T and 242T are folded over the support posts and are disposed substantially parallelly with respect thereto.

(97) It is appreciated that the foldable top segments 240T and 242T at a top of the support posts 240 and 242 can replace the bottom bar 250 or be in addition thereto.

(98) Folding and unfolding of the wheelchair takes place similar to the arrangement disclosed hereinbefore in connection with the previous example.

(99) Attention is now made to FIGS. 17A to 17G of the drawings, directed to yet another example of head support assembly according to the present disclosure, generally designated 310, mounted on a seat in the form of a generic type wheelchair, generally designated 314.

(100) The wheelchair 314 is a collapsible wheelchair of the type comprising a right side frame member 318 and a left side frame member 320 articulated to one another by a collapsible X-shaped cross-frame 324, each side frame mounted over a large rear wheel 326 and a front caster wheel 328, with a foldable seat 330 and a foldable backrest 332 extending between the right side frame member 318 and the left side frame member 320. The wheelchair 314 is collapsible between a collapsed position (shown in FIG. 17B) and a deployed position (shown in FIG. 17A).

(101) Whilst a specific wheelchair is illustrated in the annexed drawings, it is appreciated that other types and shapes of wheelchairs can be used as well.

(102) The head support assembly 310 is a modular system that can be configured as an add-on assembly for mounting on a wheelchair, or pre-fitted on a wheelchair.

(103) In the examples of FIG. 17A to 17G, the head support assembly 310 comprises a pair of support posts, namely a right support post 340 and a left support post 342, configured for attaching to the right side frame member 318 by a right coupler unit 346, and to the left side frame member 320 by a left coupler unit 348, respectively. The right coupler unit 346 and the left coupler unit 348 are identical to the right coupler unit 46 and the left coupler unit 48 described above. The right coupler unit 346 and the left coupler unit 348 are configured for facilitating sliding displacement of the right support post 340 left support post 342 therein between an upper position shown in FIG. 17A and a lower position shown in FIG. 17B, and for fixing the right and left support posts 340 and 342 at any position between the upper position and the lower position.

(104) The head support assembly 310 further comprises a bottom support unit 350 having a support body 352 structured of a right body member 353 and a left body member 354 pivotally articulated to one another by a first adjustment mechanism in the form of a pivot joint 355. The right body member 353 has a right opening 353′ with a tunnel formed therein and a left opening 354′ with a left tunnel formed therein.

(105) The bottom support unit 350 further comprises a right attachment element 360 and a left attachment element 370 disposed at opposite sides of the bottom support unit 350 and configured for articulation at bottom portions of the right support post 340 and the left support post 342, respectively. The right attachment element 360 is connected to the right body member 353 and the left attachment element 370 is connected to the left body member 354. The pivot joint 355 is configured for selectively adjusting the position of the right attachment element 360 and the left attachment element 370 with respect to each other between a first extended position (shown in FIG. 17C) and a first retracted position (shown in FIG. 17D).

(106) The adjustment of the position of the right attachment element 360 and the left attachment element 370 is performed by pivotally displacing them about a rotation axis Y extending through the pivot joint 355. The pivotal displacement of the right body member 353 with respect to the left body member 354 is configured for selectively adjusting the position of the right attachment element 360 and the left attachment element 370 with respect to each other, between the first extended position (shown in FIG. 17C) and the first retracted position (shown in FIG. 17D). This operation of the pivot joint 355 is configured for displacing the right attachment element 360 and the left attachment element 370 to and from each other, so as to fit the distance therebetween to the distance between the support posts 340 and 342.

(107) Although the pivot joint 355 is not configured for fixing the position of the right body member 353 with respect to the left body member 354 at any particular intermediate position between the extended position and the retracted position, according to other examples, the pivot joint 355 can be provided with any known in the art fixing mechanism capable of providing such fixing operation.

(108) As sown in FIG. 17G, the right attachment element 360 is connected to the right body member 353 via a right extending element 362, and the left attachment element 370 is connected to the left body member 354 via a left extending element 372. Both the right extending element 362 and the left extending element 372 are slidable within the tunnel of their respective body member.

(109) The right extending element 362 constitutes a part of a second adjustment mechanism 380a and the left extending element 372 constitutes a part of a third adjustment mechanism 380b. The second adjustment mechanism 380a is configured to displace and fix the right attachment element 360 with respect to the left attachment element 370 at a plurality of positions by displacing and fixing the right extending element 362 with respect to the right body member 353. The third adjustment mechanism 380b is configured to displace and fix the left attachment element 370 with respect to the right attachment element 360 at a plurality of positions by displacing and fixing the left extending element 372 with respect to the left body member 354. The second adjustment mechanism 380a and the third adjustment mechanism 380b operable independently from each, and their manner of operation is detailed below.

(110) As shown in FIG. 17A, at the deployed position of the wheelchair 314, the right support post 340 and the left support post 342 extend vertically upwards in parallel to each other, defining a certain distance therebetween. When the right support post 340 and the left support post 342 are attached to the right and left side frame members 318 and 320, the distance therebetween is dictated by the width of the wheelchair 314, and in particular, by the structure and the distance between the right and left side frame members 318 and 320 of the wheelchair 314. This distance can change from one seat to another, or be dependent on the locations at which the right and left posts are articulated to the side frame of a particular seat. Thus, the right attachment element 360 and the left attachment element 370 are adjustable with respect to each other in order to detachably attach the bottom support unit 350 to the right and left support posts 340 and 342 and to fixedly fit the distance therebetween and respectively between right and left side frame members 318 and 320. This adjustment enables the right attachment element 360 and the left attachment element 370 to fixedly assume any one intermediate position from a plurality of intermediate positions between the extended position and the retracted position. In the example of FIG. 17A, the right attachment element 360 and the left attachment element 370 are fixedly adjusted to an intermediate position which fits the distance between the right support post 340 and the left support post 342, dictated by the distance between the right and left side frames members 318 and 320 at the deployed position of the wheelchair 314.

(111) The second adjustment mechanism 380a is operable by a user to increase or decrease the distance between the right attachment element 360 to the left attachment element 370 by pulling and pushing the right attachment element 360 along the longitudinal axis X with respect to the right body member 353. The third adjustment mechanism 380b is operable by a user to increase or decrease the distance between the right attachment element 360 to the left attachment element 370 by pulling and pushing the left attachment element 370 along the longitudinal axis X with respect to the left right body member 354.

(112) Reference is now made particularly to FIGS. 17F and 17G, illustrating the structure of the bottom support unit. As mentioned above, the right attachment element 360 and the left attachment element 370 are each separately adjustable between an extended position and a retracted position (shown in FIG. 17F) by displacing them along a longitudinal axis X, so that at the retracted position, the distance between the right attachment element 360 and the left attachment element 370 is a minimal first distance D4, and at the extended position, the distance between the right attachment element 360 and the left attachment element 370 is a maximal second distance D5 which is greater than the first distance D4. As shown in FIG. 17F, at the retracted position, the right attachment element 360 and the left attachment element 370 are adjacently positioned to opposite lateral sides of the right body member 353 and the right body member 354, respectively. At the intermediate position of the right attachment element 360 and the left attachment element 370 shown in FIG. 17A, the right attachment element 360 and the left attachment element 370 are spaced from each other to a third distance D6 which is greater than D4 and smaller than D5.

(113) As shown in FIG. 17G, each one of the second adjustment mechanism 380a and the third adjustment mechanism 380 is further configured for fixing the position of the right attachment element 360 and the left attachment element 370 with respect to each other. The second adjustment mechanism 380a thus comprises a first fixing mechanism in the form of a lower rack 386 of the right extending element 362 and an upper rack 387 of a right fixing member 388, which upon engagement configured to fix the right attachment element 360 and the left attachment element 370 at any one intermediate position from a plurality of intermediate positions between the extended position and the retracted position. The right fixing member 388 is mounted to the right body member 353 by two spring screws 389, allowing slight displacement of the right fixing member 388 upwardly and downwardly upon displacement of the right extending element 362 along the longitudinal axis X, while the right fixing member 388 normally tends to be displaced to its upward fixing position.

(114) The third adjustment mechanism 380b comprises a second fixing mechanism in the form of a lower rack 386′ of the left extending element 372 and an upper rack 387′ of a left fixing member 388′, which upon engagement configured to fix the right attachment element 360 and the left attachment element 370 at any one intermediate position from a plurality of intermediate positions between the extended position and the retracted position. The left fixing member 388′ is mounted to the left body member 354 by two spring screws 389, allowing slight displacement of the left fixing member 388′ upwardly and downwardly upon displacement of the left extending element 372 along the longitudinal axis X, while the right fixing member 388′ normally tends to be displaced to its upward fixing position.

(115) As shown in FIG. 17A, the flexible head support unit 170 of FIGS. 9, 11B, 12A, 12B and 13 is articulated to the right support post 340 and to the left support post 342. Therefore, all the above explanations with respect to the flexible head support unit 170 are similarly relevant for the example of FIGS. 17A to 17G.

(116) Each one of the right attachment element 360 and the left attachment element 370 comprises a pivotal member 361 and 371, respectively, pivotally rotatable within an interior of the respective attachment element. The pivotal members 361 and 371 are configured for tightly receiving a bottom end of their respective support post via a mounting bore, so that during the course of collapsing the wheelchair 314, the right body member 353 and the left body member 354 are pivoted with respect to each other, while the support posts and their respective pivotal members 361 and 371 do not rotate. This allows easily collapsing the wheelchair 314 without requiring detaching the head support assembly 310 from the wheelchair 314, or facilitating rotation of the support posts 340 and 342 with respect to their coupler units.