Restraint system for a vehicle seat

Abstract

The invention relates to a restraint system for a vehicle seat, comprising a webbing belt element for restraining an occupant of the vehicle seat, further comprising a guide belt element which is guided continuously on a guideway, the holding element being securely connected to a first section of the guide belt element, wherein the webbing belt element is passed through a cutout of the holding element, wherein by means of a movement of the self-contained guide belt element on the guideway in a first direction of rotation the holding element is continuously adjustable within an adjustment section of the guideway from a second maximum position to a first maximum position.

Claims

1. A restraint system for a vehicle seat, comprising: a webbing belt element for restraining an occupant of the vehicle seat, further comprising a guide belt element which is guided continuously on a guideway, a holding element being positionally secure connected to a first section of the guide belt element, wherein the webbing belt element is guided passing through a cutout in the holding element, wherein by means of a movement of the guide belt element, which is self-contained, on the guideway in a first direction of rotation, the holding element is continuously adjustable within an adjustment section of the guideway from a second maximum position to a first maximum position, wherein the guideway forms a friction section arranged separately from the adjustment section, and wherein in the friction section a braking unit for the guide belt element is arranged which comprises a friction wheel unit arranged on a first side of the guide belt element and a brake shoe unit which is arranged on a second side of the guide belt element and which can interact with the friction wheel unit.

2. The restraint system according to claim 1, wherein the friction wheel unit comprises a friction wheel element, an outer surface of which forms a friction surface with respect to the guide belt element, wherein a rotational movement of the friction wheel element around a central axis of the friction wheel element is acted upon by a force in a first direction and forms a freewheel in a second direction.

3. The restraint system according to claim 2, wherein the brake shoe unit comprises a brake shoe element which forms a cutout designed to be complementary to a section of the outer surface of the friction wheel element.

4. The restraint system according to claim 1, wherein at least one of the webbing belt element is guided passing through a cutout in the first section of the guide belt element, and the cutout of the guide belt element and the cutout of the holding element overlap one another.

5. The restraint system according to claim 4, wherein at least one of a longitudinal extension of the cutout of the guide belt element and a longitudinal extension of the cutout of the holding element are arranged at an acute angle relative to the first direction of rotation, and wherein an extent of the holding element in a direction parallel to the first direction of rotation is greater on a first side than on a second side.

6. The restraint system according to claim 4, wherein at least one of a longitudinal extension of the cutout of the guide belt element and a longitudinal extension of the cutout of the holding element are arranged at an acute angle relative to the first direction of rotation.

7. The restraint system according to claim 4, wherein an extent of the holding element in a direction parallel to the first direction of rotation is greater on a first side than on a second side.

8. The restraint system according to claim 1, wherein two exterior surfaces of the holding element each have an elevation, each of which is guided in a complementary groove of a frame element surrounding the holding element.

9. The restraint system according to claim 1, wherein a first tensioning roller for the guide belt element is arranged in a first tensioning section of the guideway between the adjustment section and the friction section, and a second tensioning roller for the guide belt element is arranged in a second tensioning section of the guideway between the adjustment section and the friction section, the first tensioning section and the second tensioning section being arranged opposite one another.

10. A restraint system for a vehicle seat, comprising: a webbing belt element for restraining an occupant of the vehicle seat, further comprising a guide belt element which is guided continuously on a guideway, a holding element being positionally secure connected to a first section of the guide belt element, wherein the webbing belt element is guided passing through a cutout in the holding element, wherein by means of a movement of the guide belt element, which is self-contained, on the guide-way in a first direction of rotation, the holding element is continuously adjustable within an adjustment section of the guideway from a second maximum position to a first maximum position, wherein at least one of: a) the webbing belt element is guided passing through a cutout in the first section of the guide belt element; and b) the cutout of the guide belt element and the cutout of the holding element are arranged to overlap one another.

11. The restraint system according to claim 10, wherein at least one of a longitudinal extension of the cutout of the guide belt element and a longitudinal extension of the cutout of the holding element are arranged at an acute angle relative to the first direction of rotation, and wherein an extent of the holding element in a direction parallel to the first direction of rotation is greater on a first side than on a second side.

12. The restraint system according to claim 10, wherein two exterior surfaces of the holding element each have an elevation, each of which is guided in a complementary groove of a frame element surrounding the holding element.

13. The restraint system according to claim 10, wherein an extent of the holding element in a direction parallel to the first direction of rotation is greater on a first side than on a second side.

14. The restraint system according to claim 10, wherein at least one of a longitudinal extension of the cutout of the guide belt element or a longitudinal extension of the cutout of the holding element are arranged at an acute angle relative to the first direction of rotation.

15. A restraint system for a vehicle seat, comprising: a webbing belt element for restraining an occupant of the vehicle seat, further comprising a guide belt element which is guided continuously on a guideway, a holding element being positionally secure connected to a first section of the guide belt element, wherein the webbing belt element is guided passing through a cutout in the holding element, wherein by means of a movement of the guide belt element, which is self-contained, on the guide-way in a first direction of rotation, the holding element is continuously adjustable within an adjustment section of the guideway from a second maximum position to a first maximum position, wherein two exterior surfaces of the holding element each have an elevation, each of which is guided in a complementary groove of a frame element surrounding the holding element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages, aims, and features of the present invention are explained with reference to the accompanying drawings and the following description, in which embodiments of the vehicle seat according to the invention are shown and described by way of example. In the drawings:

(2) FIG. 1 shows a side view of a vehicle seat with a schematically marked example area, in which a frame element of a restraint system according to the invention can be arranged;

(3) FIG. 2a shows a perspective view of a first embodiment of the restraint system according to the invention;

(4) FIG. 2b shows a perspective view of the restraint system according to the invention, according to which parts of the restraint system are hidden;

(5) FIG. 3a shows a perspective view of the restraint system according to the invention, according to which the holding element is arranged in a central position;

(6) FIG. 3b shows the view according to FIG. 3a, wherein the holding element is arranged in a first maximum position;

(7) FIG. 4a shows a schematic representation of the restraint system according to the invention;

(8) FIG. 4b shows an enlarged representation of the view of FIG. 4a;

(9) FIG. 5a shows representations of the holding element, the guide belt element and the webbing belt element;

(10) FIG. 5b shows a cross-section along the line A-A in FIG. 2b.

DETAILED DESCRIPTION

(11) It should be mentioned that parts have been omitted from the figures for better clarity. For example, FIG. 5b does not show the webbing belt element 4. FIGS. 2a and 2b show only parts of the restraint system 1 according to the invention.

(12) FIG. 4a shows a restraint system 1 for a vehicle seat S (see FIG. 1), comprising a webbing belt element 4 for restraining an occupant (not shown) of the vehicle seat S, further comprising a guide belt element 5 which is guided continuously on a guideway 6. The holding element 3 is securely connected to a first section 52 of the guide belt element 5, the webbing belt element 4 being passed through a cutout 31 (see FIG. 5a) of the holding element 3. According to the invention, it is provided that the guide belt element 5 is self-contained, whereby by means of a movement of the guide belt element 5 on the guideway 6 in a first direction of rotation 61, the holding element 3 is continuously adjustable within an adjustment section 6a of the guideway 6 from a second maximum position 12b to a first maximum position 12a.

(13) As shown in FIG. 5b, the guide belt element 5 has a cross-section which is perpendicular to the first direction of rotation 61 and in the present case is in the form of a rectangle. In the present case, a width 5b of the guide belt element 5 is substantially greater than a height 5h of the guide belt element 5. A constricted state of the guide band element 5 is shown (as will be explained in more detail below); in the present case, the relations mentioned between the dimensions of the cross-section of the guide belt element also apply to the non-constricted cross-section of the guide belt element.

(14) In the present case, all conceivable positions of the holding element 3, which it assumes with respect to a course of the guideway 6, are arranged within the adjustment section 6a. According to FIG. 3a, the holding element 3 is arranged in a position approximately midway between the first maximum position 12a and the second maximum position 12b. According to FIG. 3b, the holding element 3 is arranged in the first maximum position 12a.

(15) The holding element 3 takes on the function of the support element of the webbing belt element 4. The webbing belt element 4 is guided within the cutout 31 of the holding element 3, but is otherwise designed to be movable with respect to the latter.

(16) In the present case, the holding element 3 experiences only a translational movement and no rotational movement during an adjustment as described above. In the present case, the direction of rotation 61 and the guide belt element 5 are designed to run in a straight line within the adjustment region 6a.

(17) Due to the closed shape of the guide belt element, it has two possible directions of rotation 61, 62. In the present case, the two directions of rotation 61, 62 are opposite to each other. The second direction of rotation 62 in relation to a course of the guideway 6 preferably corresponds to the direction from the first 12a to the second maximum position 12b. Furthermore, the first direction of rotation 61 corresponds with respect to a course of the guideway 6 in the present case to the direction from the second maximum position 12b to the first maximum position 12a.

(18) In the present case, the guide belt element 5 is a polyester belt and has a low degree of stretchability. The holding element 3 is securely mounted on the guide belt element 5 (see FIG. 5b) and in the present case is connected to both sides 50, 51 of the guide belt element 5 by means of an adhesive connection 54. In addition, the holding element 3 comprises two parts 3a, 3b, of which one part 3a is arranged on the first side 50 of the guide belt element 5 and the other part 3b is arranged on a second side 51 of the guide belt element 5. In the present case, these two parts 3a, 3b are connected to one another by means of a clip connection 36.

(19) In the present case, the guide belt element 5 forms a constriction in its cross-section in the first section 52 when the holding element 3 is mounted, since the guide belt element 5 in the present case is subjected to a force in the form of a surface pressure by means of the holding element 3.

(20) In the present case, the webbing belt element 4 likewise has a rectangular cross-section (see FIG. 5a). The cutout 31 in the holding element 3 for the webbing belt element 4 is complementary here to the cross-section of the webbing belt element 4 and is rectangular.

(21) FIG. 4a also shows that the guideway 6 forms a friction section 6b arranged separately from the adjustment section 6a. In the present case, a braking unit 9 for the guide belt element 5 is arranged in the friction section 6b. This braking unit comprises a friction wheel unit 10 arranged on the first side 50 of the guide belt element 5 and a brake shoe unit 11 which is arranged on a second side 51 of the guide belt element 5 and which can interact with the friction wheel unit 10.

(22) In the present case, the friction wheel unit 10 forms a frictional contact with the first side 50 of the guide belt element 5. In the present case, the brake shoe unit 11 forms a frictional contact with the second side 51 of the guide belt element 5. In the present case, the friction wheel unit 10 and the brake shoe unit 11 lie opposite one another in relation to the direction of rotation 61.

(23) It is also shown that the friction wheel unit 10 in the present case comprises a friction wheel element 13. In the present case, the outer surface 13b of the friction wheel element forms a friction surface with respect to the guide belt element 5. In the present case, a rotational movement of the friction wheel element 13 about a central axis 13a of the friction wheel element 13 is acted upon by force in a first direction 14a and forms a freewheel in a second direction 14b.

(24) In the present case, the brake shoe unit 11 has exactly one mirror symmetry plane E1 (see FIG. 4b). In the present case, a central axis 13a of the friction wheel element 13 lies in this mirror symmetry plane E1.

(25) According to FIG. 4a, it is shown that the first direction 14a of the friction wheel element 13 is aligned with the second direction of rotation 62 of the guideway 6. It is also shown that the second direction 14b of the friction wheel element 13 is aligned with the first direction of rotation 61 of the guideway 6.

(26) In the present case, the first maximum position 12a is arranged above the second maximum position 12b with respect to a height direction 1z of the restraint system 1. According to FIG. 4a, the holding element 3 is arranged at a position between the first maximum position 12a and the second maximum position 12b. Gravity acts on the holding element 3 and attempts to move it towards the second maximum position 12b. This undesired movement is successfully prevented by the force applied to the guide belt element 5 by means of the friction wheel element 13 and the brake shoe unit 11. In the case of a desired adjustment of the holding element 3 in the direction of the second maximum position 12b, the friction surface of the friction wheel element 13 and the brake shoe unit 11 is designed such that the applied frictional force can be overcome manually. In the opposite direction, that is to say with a desired adjustment of the holding element 3 upwards, on the other hand, an almost force-free adjustment is possible.

(27) In the event of a crash, strong forces act on the webbing belt element 4, for example in a direction 16 (see FIG. 4a) starting from the holding element 3 and directed away from the friction section 6b of the restraint system 1. This immediately overcomes the applied frictional force. The position of the holding element 3 is changed until the second maximum position 12b is reached. According to FIG. 1, the vehicle seat S is designed so that the backrest RL is designed to be pivotable relative to the seat surface of the seat part ST and so that the two maximum positions 12a, 12b of the holding element 3 are arranged on an upper region 17 of the backrest RL. The lever arm, which the backrest RL represents with respect to a rotation about an axis A1 between the backrest RL and the seat surface or seat part ST, is therefore shortened in the event of a crash, and the torque introduced into the seat axis A1 is reduced. The illustration shows the maximum length L12a of the lever arm when the holding element 3 is arranged in its first maximum position 12a, and the minimum length 12b of the lever arm when the holding element 3 is arranged in its second maximum position 12b.

(28) In the present case, it is provided that the brake shoe unit 11 comprises a brake shoe element 15. In the present case, this forms a cutout 15a designed to be complementary to a section 13bb of the outer surface 13b of the friction wheel element 13. In the present case, this cutout 15a is curved at least in some sections.

(29) It is thus ensured in the present case that at least part of the outer surface 13b of the friction wheel element 13 and at least part of a surface of the cutout 15a of the brake shoe element 15 form a section of the guideway 6 for the guide belt element 5.

(30) In the present case, the brake shoe element 15 is spring-loaded with respect to a direction 18 (see FIG. 4b), which is arranged parallel to the normal vector of the two sides 50, 51 of the guide belt element 5 and is oriented towards the central axis 13a of the friction wheel element 13.

(31) According to FIG. 5a, the webbing belt element 4 is shown in a cross-section, and the holding element 3 and the guide belt element 5 are each shown in a non-assembled state of the restraint system 1; thus there are individual views of the elements 3, 4 and 5. In the fully assembled state (see, for example, FIG. 4a) of the restraint system 1, it is ensured in the present case that the webbing belt element 4 is guided through a cutout 53 (see FIG. 5a) in the first section 52 of the guide belt element 5. In the present case, the cutout 53 of the guide belt element 5 and the cutout 31 of the holding element 3, through which the guide belt element 5 is also guided, are arranged overlapping one another. Furthermore, in the present case, both cutouts 31, 53 are of the same size and congruent to one another. In the fully assembled state of the restraint system 1, the degree of overlap between the two cutouts 31, 53 is 100% in the present case.

(32) According to FIG. 5a, it is also illustrated that a longitudinal extension of the cutout 53 of the guide belt element 5 and a longitudinal extension of the cutout 31 of the holding element 3 are arranged at an acute angle to the first direction of rotation 61.

(33) It is also shown that an extent of the holding element 3 in a direction 3z parallel to the first direction of rotation 61 is greater on a first side 32 than on a second side 33.

(34) In addition, two exterior surfaces 34, 35 of the holding element 3 each have an elevation 30, which is guided in a complementary groove 71 of a frame element 7 surrounding the holding element 3. This ensures that the holding element 3 is guided vertically displaceably within the frame element 7. In the present case, the frame element 7 forms the upper and lower limits of the adjustment movement. In addition, the first maximum position 12a and the second maximum position 12b of the holding element 3 are formed by means of the frame element 3 (see here FIG. 2a).

(35) FIG. 4a shows that a first tensioning roller 81 for the guide belt element 5 is arranged in a first tensioning section 6c of the guideway 6 between the adjustment section 6a and the friction section 6b, and a second tensioning roller 82 for the guide belt element 5 is arranged in a second tensioning section 6d of the guideway 6 between the adjustment section 6a and the friction section 6b, the first tensioning section 6c and the second tensioning section 6d being arranged opposite one another.

(36) In the present case, the guideway 6 comprises the following sections along its circumference in this sequence: the first tensioning section 6c, the friction section 6a, the second tensioning section 6d and the adjustment section 6a, which is followed by the first tensioning section 6c due to the closed configuration of the guide belt element 5. This sequence is illustrated in FIG. 4a in a clockwise direction in a direction of the guideway 6.

(37) In this case, a position of both tensioning rollers 81, 82 is adjustable in the present case. In the present case, the position of both tensioning rollers is adjusted perpendicular to one of the directions of rotation 61, 62 of the guideway 6 and is illustrated in FIG. 4a by means of the directions 19a, 19b marked with double arrows.

(38) It is understood that the above embodiment is merely an initial configuration of the restraint system 1 according to the invention. In this respect, the configuration of the invention is not limited to this embodiment.

(39) All the features disclosed in the application documents are claimed as being essential to the invention, provided that, individually or in combination, they are novel over the prior art.

LIST OF REFERENCE SIGNS

(40) 1 restraint system

(41) 3 holding element

(42) 3a, 3b part

(43) 3z, 16, 18, 19a, 19b direction

(44) 4 webbing belt element

(45) 5 guide belt element

(46) 5b width

(47) 5h height

(48) 6 guideway

(49) 6a adjustment section

(50) 6b friction section

(51) 6c, 6d tensioning section

(52) 7 frame element

(53) 9 braking unit

(54) 10 friction wheel unit

(55) 11 brake shoe unit

(56) 12a, 12b maximum position

(57) 13 friction wheel element

(58) 13a central axis

(59) 13b outer surface

(60) 13bb, 52 section

(61) 14a, 14b direction

(62) 15 brake shoe element

(63) 15a, 31, 53 cutout

(64) 17 region

(65) 30 elevation

(66) 32, 33, 50, 51 side

(67) 34, 35 exterior surface

(68) 36, 54 connection

(69) 61, 62 direction of rotation

(70) 71 groove

(71) 81, 82 tensioning roller

(72) A1 axis

(73) E mirror symmetry plane

(74) F spring element

(75) L12a, L12b length

(76) RL backrest

(77) S vehicle seat

(78) ST seat part

(79) W angle