ADJUSTABLE BED

Abstract

The invention concerns an adjustable bed (10) having zero wall clearance and zero gravity functionality. The bed comprises a frame (20) and an adjustable mattress support platform (11) having a plurality of articulated support sections (12, 16, 18) pivotally mounted with respect to one another for relative angular adjustment, and actuator means (52) for effecting coordinated movement of the support sections to reconfigure the bed, between a flat lowered configuration and a raised configuration for supporting an occupant in a zero gravity recumbent position. The actuator means comprises a single actuator, preferably a single linear actuator.

Claims

1. A wall proximity adjustable bed having zero wall clearance and zero gravity functionality, said bed comprising: a frame and an adjustable mattress support platform having a plurality of articulated support sections pivotally mounted with respect to one another for relative angular adjustment; said frame having a first and a second lateral side; and an actuator effecting co-ordinated movement of said support sections to reconfigure the bed between a flat lowered configuration and a raised configuration thereby supporting an occupant in a zero gravity recumbent position.

2. The wall proximity adjustable bed, as claimed in claim 1, wherein: said actuator is a single actuator.

3. The wall proximity adjustable bed, as claimed in claim 2, wherein: said actuator is a single linear actuator.

4. The wall proximity adjustable bed, as claimed in claim 1, wherein: said plurality of articulated mattress support sections include at least a head end section, a toe end section and an intermediate section disposed between the head and toe end sections.

5. The wall proximity adjustable bed, as claimed in claim 4, further comprising: a cam associated with one of the frame and the intermediate support section and a cam follower associated with the other of the frame and the intermediate movable support section.

6. The wall proximity adjustable bed, as claimed in claim 5, wherein: said cam is arranged so that movement of said intermediate support section follows a rearward and downwards trajectory with respect to the frame as the head end section is raised.

7. The wall proximity adjustable bed, as claimed in claim 6, wherein: said head end section is supported at a position along its length such that said rearward movement and said downward movement of the intermediate support section causes the head end section to rotate to an inclined position relative to a start position.

8. The wall proximity adjustable bed, as claimed in claim 7, wherein: said head end section is supported at a position along its length by a roller fixed in relation to the frame or the head end section.

9. The wall proximity adjustable bed, as claimed in claim 1, wherein: said frame further comprises a first and a second spaced apart parallel side frame members.

10. The wall proximity adjustable bed, as claimed in claim 4, wherein: said frame comprises further a first and a second spaced apart parallel side frame members shaped as an inflexion curve.

11. The wall proximity adjustable bed, as claimed in claim 4, wherein: said cam and cam follower are provided on both said first and said second lateral sides of the bed.

12. The wall proximity adjustable bed, as claimed in claim 4, wherein: said cam follower further comprises at least one of a roller, and a bearing.

13. The wall proximity adjustable bed, as claimed in claim 4, wherein: said cam and said cam follower are provided at both said first and said second lateral sides of the frame such that said intermediate support section is supported on both sides thereof.

14. The wall proximity adjustable bed, as claimed in claim 4, wherein: said cam comprises a first and a second guide.

15. The wall proximity adjustable bed, as claimed in claim 14, wherein: said first and second guides each further comprise a first and a second guide section.

16. The wall proximity adjustable bed, as claimed in claim 15, wherein: said first and second guide sections each further comprise at least one curved guide section.

17. The wall proximity adjustable bed, as claimed in claim 16, wherein: said first guide section further comprises said curved guide section.

18. The wall proximity adjustable bed, as claimed in claim 17, wherein: said first guide section is contiguous with a linear second guide section.

19. The wall proximity adjustable bed, as claimed in claim 17, wherein: said first curved guide section has a cam profile that is configured so that an initial movement of said intermediate section by said actuator in a rearwards direction has a greater downward vertical component of movement than in said second guide section.

20. (canceled)

21. The wall proximity adjustable bed, as claimed in claim 18, wherein: said first curved guide section has a cam profile that is configured so that an initial movement of said intermediate section by said actuator in a rearwards direction has a greater downward vertical component of movement than in said second guide section.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Embodiments of the present invention will now be more particularly described, by way of example only, with reference to the accompanying drawings; in which:

[0040] FIG. 1 is a perspective view from above of a an adjustable bed according to an embodiment of the present invention, with the bed in an upright configuration for supporting an occupant in a recumbent zero gravity position;

[0041] FIG. 2 is a perspective view of the bed of FIG. 1 with the bed viewed from below;

[0042] FIG. 3 is a perspective view similar to FIG. 1 with the mattress support deck of the bed shown in ghost outline;

[0043] FIG. 4 is an enlarged perspective view of the underside of the mid-section of the bed shown in FIG. 1;

[0044] FIG. 5 a side elevation view of the bed of FIG. 1, with the bed in the upright configuration of FIG. 1;

[0045] FIG. 6 a side elevation view of the bed of FIG. 1, with the bed in an intermediate semi-recumbent position;

[0046] FIG. 7 is a perspective view of the bed of FIG. 1 with the bed viewed from the left hand side front quarter, with the bed shown in the fully lowered position;

[0047] FIG. 8 is a perspective view similar to FIG. 7 with the mattress support deck of the bed shown in ghost outline;

[0048] FIG. 9 a side elevation view of the bed of FIG. 1, with the bed in the fully lowered position of FIG. 7.

[0049] FIG. 10 is a perspective view from below of a an adjustable bed according to another embodiment of the present invention, with the bed in a semi-upright configuration for supporting an occupant in a recumbent zero gravity position;

[0050] FIG. 11 is a perspective view from below of the adjustable bed of FIG. 10, with the bed in a fully lowered configuration; and

[0051] FIGS. 12 to 14 are respective side views of the bed of FIG. 10 with the bed shown in lowered, intermediate and raised positions.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0052] Reference will now be made in detail to embodiments of the invention. Wherever possible, same or similar reference numerals are used in the drawings and the description to refer to the same or like parts or steps. The drawings are in simplified form and are not to precise scale. The word couple and similar terms do not necessarily denote direct and immediate connections, but also include connections through intermediate elements or devices. For purposes of convenience and clarity only, directional (up/down, etc.) or motional (forward/back, etc.) terms may be used with respect to the drawings. These and similar directional terms should not be construed to limit the scope in any manner. It will also be understood that other embodiments may be utilized without departing from the scope of the present invention, and that the detailed description is not to be taken in a limiting sense, and that elements may be differently positioned, or otherwise noted as in the appended claims without requirements of the written description being required thereto.

[0053] Various operations may be described as multiple discrete operations in turn, in a manner that may be helpful in understanding embodiments of the present invention; however, the order of description should not be construed to imply that these operations are order dependent.

[0054] As will be understood by those of skill in the art, the phrase zero gravity is used descriptive as representing the functional and structural results herewith and not an actual expression that there is no gravity.

[0055] Referring to the drawings, FIGS. 1 to 9 schematically show an adjustable bed 10 according to an embodiment of the present invention. The bed 10 comprises a mattress support deck 11 composed of three adjacent mattress support section panels, including an adjustable back/head (upper body) support section panel 12 at the head end of the bed, an intermediate support section panel 16 in the middle of the bed and a foot and lower leg support section panel 18 at the toe end of the bed. The panels 12, 16 and 18 are adjustably mounted on a structural support frame 20. In the drawings of FIGS. 2 to 10 the panels 12, 16 and 18 are shown in ghost outline to reveal the detail construction of the adjustable bed including the support frame and the actuating mechanism of the bed. The panels 12, 16 and 18 are substantially the same size and in the illustrated embodiment have a width dimension slightly greater than the width of the frame.

[0056] In the un-articulated configuration of FIGS. 7 to 9, the panels 12, 16 and 18 are aligned in a flat horizontal planar relationship. The panels 12, 16 and 18 are preferably constructed of wood, MDF or other suitable board material.

[0057] The panels may include upholstered cushions or pads (not shown) or the like for supporting a mattress (not shown) positioned on the deck, alternatively the mattress may be positioned directly on top of the panels 12-18.

[0058] In FIGS. 1 to 5 the bed 10 is shown in a fully articulated configuration, adjusted for supporting an occupant of the bed in a recumbent zero gravity position. In this position the back support section panel 12 is raised about, and inclined with respect to, the frame 20 about a pivot axis defined by hinges 22 which pivotally connect the upper body support panel 12 and the intermediate section support panel 16 together along their respective adjacent edges. The intermediate support section panel 16 is inclined with respect to the frame about the pivot axis defined by hinges 22. The lower leg section panel 18 is maintained in a horizontal orientation through a third pivot axis defined by hinges 26 which pivotally connect the lower leg support panel 18 to the other end of the intermediate section support panel 16. Hinges 22 and 26 are constructed in preferred embodiments of a fatigue resistant plastics material and may be constructed as a so called living hinge. Other types of hinge are also contemplated including extruded metal tubes, for example extruded aluminum or aluminum alloy, having a d or p shape cross section, including a longitudinal mounting flange as an integral part of the extrusion. A hinge pin passes through the extruded tube in a known manner and may be mounted on bearings (ball bearing type) located at the respective ends of the tube to support the hinge pin in a low friction manner.

[0059] In the lowered position the adjustable support panels 12 16 and 18 combine to define a substantially flat planar horizontal support platform. The various support panels 12, 16 and 18 may each have a mattress support cushion (not shown) of pre-determined thickness, which combine to provide a mattress foundation for supporting a suitable mattress. The panels 12-18 may be upholstered, with or without support cushions. The bed may be a so called soft edge adjustable bed having an upholstered bolster around the edges of the bed. The present invention also contemplates arrangements where the frame 10 is integrated in a divan type bed foundation structure. In the illustrated embodiment the bed frame 20 is provided with floor standing legs 28 and is thus self-supporting and may therefore be located in the interior region of a bed surround. The dimensions of the bed are such that the bed has the size of a double bed, but the present invention contemplates beds of many different widths including standard single size beds to much larger doubles. For example, where independent control of each side of a double bed is required, a pair of single size adjustable beds according to the present invention may be arranged in side by side relation so that each occupant may independently control the degree of adjustment on their respective side of the bed.

[0060] The frame 20 comprises a generally rectangular structural support, when viewed in plan, and is preferably constructed of metal but other materials may be used for various component parts, in addition to or instead of metal, including board type material, for example engineering plastic, MDF, timber or other fiber type board for example.

[0061] The frame 20 comprises a pair of elongate parallel lateral side frame members 30 in the form of side rails. The side frame members have the shape of an inflexion curve with the inflexion point substantially midway along their length. The upper surface of the side frame members has a convex profile along the first half of its length, from the toe end to the inflexion point of the bed, and a concave profile from the inflexion point to the head end of the bed. Thus, the inflexion curves provides for a change in vertical height of the frame along the length of the bed, with the toe end of the side frame members occupying a higher position above the floor on which the bed stands than the head end. The significance of the inflexion curve profile of the side members will become apparent from the description that follows.

[0062] The side frame members extend longitudinally along the length of the bed, on opposite sides thereof, and are joined together at their respective ends by metal, preferably steel, cross-members 31, 32 to form a rectangular box type structural support frame. A further cross-member 34 is positioned between the side frame members 30 towards the toe end of the bed. The side frame members 30 are constructed of suitably dimensioned oval shape cross-section metal tube, preferably extruded steel tube, and the cross-member 34 of similar section metal tube. The frame 20 is provided with legs 28 at each of the corners of the rectangular frame structure. The side members 30 and cross-members 31, 32 and 34 are joined together by welding or alternatively by fixing means such as screws, bolts, fasteners or the like. In preferred embodiments the legs are attachably/detachably fixed to the frame by suitable reversible fixing means as well known in the art.

[0063] The support frame 20 thereby constitutes the floor standing part of the bed 10 and in this respect the frame may stand directly on legs 28 or be provided with castors, feet or the like at the end of the legs, as is also well known in the art.

[0064] Two pairs of guide channels 36 and 38 are provided on the inward facing surfaces of the respective side frame members 30 at longitudinally spaced locations on each side of the bed. The first pair of guide channels 36 is positioned adjacent to the cross member 34 and the second pair 38 in the region of the inflexion point substantially mid-way along the length of the bed. The first guide channel comprises a slightly curved forward section 36a and linear rearward section 36b. The forward section 36a curves upwards slightly from the linear rearward section which extends substantially horizontally in the normal orientation of the bed. A mounting bracket 37 is attached to each of the guides 36 for attachment to the inward facing surface of the respective side member 30, preferably by welding. The second guide channel also comprises a curved forward section 38a and linear rearward section 38b. The forward section 36a is curved upwards from the adjacent linear rearward section 38b of the guide which is inclined in an upwards and forwards direction towards the toe end of the bed. A mounting bracket 39 is attached to each of the guides 38 for attachment to the inward facing surface of the respective side member 30, preferably by welding. The curvature of the forward guide section 38a is significantly greater than the curvature of the forward guide section 36b for reasons as will become apparent from the description that follows.

[0065] The guide channels 36 and 38 are U-section open channels with their respective open sides facing inwards into the interior region of the frame 20.

[0066] The guide channels 36 and 38 define cam means for guiding the intermediate section 16 of the bed. The guide channels 36 and 38 accommodate respective rollers in the form of bearings 40, 42 mounted on respective bearing pins 40a, 42a on L-shape 5 brackets 40b, 42b secured to the underside of the intermediate support section panel 16. Bearings 40 are located at the forward end of the panel 16 adjacent hinges 26. Bearings 42 are located at the midpoint of panel 16 substantially equidistant from the rearward and forward ends thereof. The bearings 40 and 42 define respective cam followers of the guide channels 36 and 38.

[0067] A pair of rollers in the form of bearings 44 is provided at longitudinally spaced apart locations at the forward or toe end of the bed. The bearings 44 are mounted on respective mounting pins 44a attached to the side frame members 30 on each side of the bed. A first of the bearings 44 is located rearwards of the cross-member 31 and a second is located forwards of the cross-member 34. The bearings are located on the inward facing side of the respective side members and are arranged to support the underside of the support panel 18. As will be described in more detail below the underside of the panel 18 is in rolling contact with the support bearings 44 throughout its range of movement with respect to the frame.

[0068] The head end support panel 12 is similarly supported on its underside by rollers in the form of bearings 46 disposed on opposite sides of the frame 20 at the head end of the bed. The bearings are mounted on respective upstanding mounting brackets 48 secured to the side members 30 adjacent to and forward of cross-member 32 at the 25 head end of the bed.

[0069] The guides 36 and 38 and their respective bearings 40 and 42 and the bearings 44 and 46 are disposed such that the respective support panels lie flat and level when the bed is lowered, as shown in FIGS. 7 to 9, in the normal orientation of the bed. The bearing brackets 48 extend upwards therefore above the side members 30 to compensate for the degree of inflexion in the side members which lowers the head end of the frame with respect to the toe end.

[0070] An electrical linear actuator 52 for moving the support panels 12, 16 and 18 relative to the frame 20 is provided on the underside of the frame between the respective side rails 30. The actuator is of the Delta-drive type produced by Dewert-Okin GmbH and comprises a reversible motor part 54, a gearbox 56, an outer tube 58 and a retractable and extendable rod 60. The actuator 52 is pivotally mounted at the gearbox end of the actuator to the cross-member 34 via a cross-member clevis bracket 62 and pivot pin 64. At the other end the rod 60 is pivotally mounted to a U-shape clevis bracket 66 by means of a clevis pin 68. The bracket 66 is secured to the underside of the intermediate panel 16 in the region of the hinges 22.

[0071] The actuator 52 extends generally parallel to the side members 30 and is disposed substantially horizontal in the normal operational orientation of the bed.

[0072] Coordinated movement of the panels 12, 16 and 18 relative to the frame 20 is effected by activation of linear electrical actuator 52 positioned on the underside of the bed within the space envelope of the frame. Panel 12 is raised and lowered by respective extension and retraction of actuator 52 acting on panel 16, the movement of which is determined by the geometry of the guides 36, 38. As the actuator 52 is extended the panel 16 moves rearwards towards the head end of the bed as the rollers 40, 42 follow the cam profile of the respective guides 36, 38. As the panel 16 moves rearward the panel also moves downwards. This downwards movement of the panel 16 is greatest at the rearward end of the panel, at hinges 22 due to the difference in guide path geometry between the forward guides 36 and rearward guides 38. The forward end of the panel 16 at hinges 26 does not move downwards as the panel moves rearwards. The initial downward movement of the panel 16 is exaggerated by the downward curved nature of the guide sections 36a and 38a. This causes the rearward end of the panel to dip below the plane occupied by the upper point on the bearings 46, which generates a turning moment on the rear panel 12 due to the reaction force at the rollers 46 acting on the panel 12 causing it to pivot upwards with respect to the mid panel 16 as panel 16 is moved rearwards. The initial angular adjustment of the rear panel 12 is greater during this initial phase of adjustment as the rollers 40, 42 move from the forward end of the respective guides 36, 38 through the curved sections 36a, 38a.

[0073] The downwards progression of the panel 16 becomes more linear as the actuator is further extended and the rollers 40, 42 move along the linear sections 36b, 38b of the respective guides 36, 38. As the actuator is extended the rearwards and downwards trajectory of panel 16 causes the rear panel 12 to rise progressively from the non-adjusted position of FIGS. 7-9 to the fully raised inclined position of FIGS. 1-5. The movement of panel 12 follows a zero wall clearance path throughout its range of movement, that is to say a constant gap is maintained between the rearward edge of the panel 12 and surrounding structure, for example a headboard of the bed or adjacent wall, when the panel 12 moves rearwards or forwards with respect to the frame during adjustment of the bed. This functionality provides a wall proximity adjustable bed as the position of the occupant is maintained in proximity with the wall against which the head end of the bed is arranged. As is well known in the art this desirable function also ensures that the occupant is comfortably positioned adjacent bedside furniture and the like when the bed is raised or lowered, maintaining the position of the occupant with respect to their surroundings even when the bed is adjusted to raise the occupant towards a recumbent position.

[0074] The initial curved part of the guides 36a, 36b provides the bed with a greater degree of zero wall clearance functionality during the initial movement when the intermediate panel 16 is moved rearwards and the rear panel 12 begins to rise.

[0075] During the rearward movement of the panel 16 by the actuator 52, the forward panel 18 also moves rearward with respect to the frame 20. Relative pivoting of the panels 16 and 18 at hinges 26 ensures that the forward panel 18 remains horizontal. Contact between the underside of the panel and rollers 44 is maintained under gravity by the weight of the panel and that part of any mattress positioned on the bed that is carried by the panel 18.

[0076] The bed of FIGS. 1-9 comprises so called zero-gravity functionality, that is to say it is capable of supporting the occupant in a zero gravity recumbent position when the rear panel is raised to an inclined position. Coordinated movement of the panels 12, 16 and 18 during extension and retraction of the actuator is such that the rear end of the mid-section panel at hinge 22 occupies a lower position relative to the forward end of the panel at hinge 24 in all adjustment positions of the bed. Panel 16 is therefore inclined downwards in the rearwards direction of the bed in all adjustment positions when the rear panel 12 is raised or inclined upwards. In this respect the occupant is less likely to experience discomfort due to the raised rear panel creating a forward force on the occupant's body forcing the occupant towards the toe end of the bed. The dipping nature of the rear hinge line 22 compensates for such effects due to its proximity to the occupant's hip joint and the raised position of the hinge line 26 is in proximity to the occupant's knee joint.

[0077] Referring now to FIGS. 10 to 14 which show a second embodiment of a wall proximity adjustable bed according to the present invention. In the drawings of FIGS. 10 to 14 the same reference numerals are used to designate the same or similar components as in the embodiment of FIGS. 1 to 9. The adjustable bed of FIGS. 10 to 11 differs from the bed of FIGS. 1 to 9 in a number of respects. In the second embodiment the elongate parallel lateral side frame members 30 are straight, not curved. The side frame members are constructed as box section rails having a flat upper surface.

[0078] Instead of the rollers 44, a pair of rollers in the form of bearings 44 is provided at the forward or toe end of the bed. The bearings 44 are mounted on respective mounting brackets 70 attached to the underside of the panel 18 on both sides of the bed. The brackets 70 are positioned approximately half way along the length of the panel 18. The bearings 44 are arranged to run on the upper surface of the side frame members 30 as the adjustable panels are moved with respect to the frame.

[0079] Pairs of guide channels 36 and 38 are provided on the inward facing sides of the respective side frame members 30 at longitudinally spaced locations on each side of the bed. The guide channels 36 and 38 are attached to planar mounting plates 72 attached to the inward facing surfaces of the respective side frame members 30 rearward of the forward cross-member 34.

[0080] The first pair of guide channels 36 is positioned adjacent to the cross member 34 at the forward end of the mounting plates 72 and the second pair 38 rearwards thereof. In this embodiment the first guide channel is straight and provides a linear guide along its length and extends substantially horizontally in the normal orientation of the bed. The second guide channel 38 comprises a linear forward section 38a, a curved mid-section 38b and linear rearward section 38c. The mid-section 38b is curved upwards from the adjacent linear rearward section 38c of the guide which is inclined in an upwards and forwards direction towards the toe end of the bed. The length of the forward guide section 38a is significantly less than the length of the mid and rearward sections of the guide 38 for reasons as will become apparent from the description that follows.

[0081] The guide channels 36 and 38 are U-section open channels with their respective open sides facing inwards into the interior region of the frame 20.

[0082] As in the previous embodiment, the guide channels 36 and 38 define cam means for guiding the intermediate section 16 of the bed. The guide channels 36 and 38 accommodate the respective rollers 40, 42 mounted on the underside of the intermediate support section panel 16.

[0083] A pair of ramp elements 74 is provided at the rearward end of the frame 20 on the side members 30. The ramp elements are provided on both sides of the frame and provide an inclined upper surface 76 which are adapted to support respective rollers in the form of bearings 78 mounted on respective downward depending brackets 80 attached to the underside of the rear panel 12. The upper surfaces of the ramp elements are inclined towards the rear or head end of the bed.

[0084] As in the previous embodiment, actuator 52 is pivotally mounted at the gearbox end of the actuator to the cross-member 34 via a cross-member clevis bracket 62 and pivot pin 64. At the other end, however, the rod 60 is pivotally mounted to the apex of a V-shape forked bracket 82 by mean of a pin 68. The distal ends of the respective forks are attached to the underside of the panel 12 in the region of the hinged end of the panel. A reinforcement bracket 84 extends between the apex of the forked bracket 82 and the underside of the panel 12 at a position approximately midway along its length.

[0085] The operation of the bed of the second embodiment is similar to the operation of the bed of the first embodiment. Coordinated movement of the panels 12, 16 and 18 relative to the frame 20 is effected by activation of linear electrical actuator 52. Panel 12 is raised and lowered by respective extension and retraction of actuator 52 acting on panel 12, the movement of which is determined by the geometry of the guides 36, 38, the ramp elements 74 and respective rollers 78. As the actuator 52 is extended the panel 16 moves rearwards, linearly at first, towards the head end of the bed as the rollers 40, 42 follow the cam profile of the respective guides 36, 38. As the panel 16 moves rearward the panel also moves downwards after an initial horizontal only movement, as determined by the linear section 38a of the guide 38. The subsequent downward movement of the panel 16 is greatest at the rearward end of the panel, at hinges 22 due to the difference in guide path geometry between the forward guides 36 and rearward guides 38.

[0086] As the panels 12, 16 and 18 move rearwards the rollers 78 follow the inclined surface of the ramp elements so that the rear or head end panel 12 is progressively raised. The ramp elements 74 and rollers 78 ensure that the distance between the hinge 22 and the contact point between the rollers 78 and the ramp elements remains the same as the panel rotates. The panel 12 is thus supported at the same point along its length throughout its range of movement.

[0087] During the rearward movement of the panel 16 by the actuator 52, the forward panel 18 also moves rearward with respect to the frame 20. Relative pivoting of the panels 16 and 18 at hinges 26 ensures that the forward panel 18 remains horizontal. Contact between the underside of the panel and rollers 44 is maintained under gravity by the weight of the panel and that part of any mattress positioned on the bed that is carried by the panel 18.

[0088] The ramp elements 74 are each provided with rollers in the form of bearings 86 at their respective distal ends. The rollers 86 contact the underside of the panel 12 when the panel 12 lies flat above the frame 20, that is to say, in the flat configuration of the bed.

[0089] In a further embodiment (not shown), the toe end section comprising the lower leg and foot support panel 18 is divided, that is to say the panel 18 is divided to provide both a lower leg support part and an adjustable foot support part hinged with respect to the lower leg support part and having angular adjustment means for adjusting the angle between both parts, as is known in the art.

[0090] Having described at least one of the preferred embodiments of the present invention with reference to the accompanying drawings, it will be apparent to those skills that the invention is not limited to those precise embodiments, and that various modifications and variations can be made in the presently disclosed system without departing from the scope or spirit of the invention. Thus, it is intended that the present disclosure cover modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.