seat belt device

Abstract

To provide a seat belt device by which a guide state of a webbing by a guide member can be made appropriate when a pre-tensioner is operated.SOLUTION: A seat belt device comprises: a guide member 12 having a guide body 14 fixed to a rear seat 100 and formed with a guide hole 22 through which a webbing 42 penetrates so as to be relatively movable; a moving body 34 relatively movable in a vertical direction with respect to the guide body between a normal position and an operating position; and an urging member that moves the moving body to the operating position by elastically deforming when a downward external force of a magnitude equal to or greater than a predetermined value is applied to a second support surface 37 of the moving body from the webbing.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a seat belt device.

Background Art

[0002] The following Patent Document 1 discloses a seat belt device including a webbing connected to a pretensioner (retractor), and a guide member (D-ring) fixed to the vehicle body above the pretensioner and having a guide hole through which the webbing is relatively movably penetrated. The webbing extends upward from the pretensioner, extends downward after passing through the guide hole, and is attached to the body of an occupant seated on a vehicle seat.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Regarding the seat belt device of the above Patent Document 1, there is room for improvement in making the guiding state of the webbing by the guide member when the pretensioner operates an appropriate state.

[0005] In consideration of the above facts, an object of the present invention is to obtain a seat belt device capable of making the guiding state of the webbing by the guide member when the pretensioner operates an appropriate state.

Means for Solving the Problems

[0006] The seat belt device according to claim 1 includes: a retractor provided in a vehicle and having a pretensioner for retractably winding up a webbing for restraining an occupant; a guide member having a guide body fixed to the rear seat of the vehicle and having a guide hole formed through which the webbing is relatively movable; and a movable body that is relatively movable in the vertical direction relative to the guide body between a normal position and an operating position below the normal position; a first support surface that constitutes a part of the bottom of the guide hole; a second support surface which is the upper surface of the movable body and, when the movable body is in the normal position, is continuous with the first support surface and together with the first support surface constitutes a webbing support surface, and when the movable body is in the operating position, is located below the first support surface; and a biasing member which, when no downward external force of a predetermined value or more is applied to the second support surface, positions the movable body in the normal position, and when a downward external force of a predetermined value or more is applied from the webbing to the second support surface, moves the movable body to the operating position by elastic deformation.

[0007] In the seat belt device according to claim 1, when the print tensioner is activated, a downward external force of a predetermined value or greater may be applied from the webbing to the second support surface, which is the upper surface of the moving body. In this case, the biasing member elastically deforms, causing the moving body to move to the operating position. As a result, the second support surface is located below the first support surface of the guide hole in the guide body. Therefore, the seat belt device according to claim 1 can ensure that the guiding state of the webbing by the guide member is appropriate when the print tensioner is activated. [Effects of the Invention]

[0008] The seat belt device according to the present invention can ensure that the guide member maintains an appropriate guiding state for the webbing when the print tensioner is activated. [Brief explanation of the drawing]

[0009] [Figure 1]This is a schematic front view of the upper right side of the rear seat, the guide member, and the webbing to which the seat belt device according to the embodiment is applied. [Figure 2] This is a front view similar to Figure 1, showing the print tensioner in operation. [Figure 3] This is a schematic cross-sectional view along the line 3-3 in Figure 1. [Figure 4] This is a schematic cross-sectional view along the arrow 4-4 in Figure 2. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the seat belt device according to the present invention will be described with reference to the drawings. In the drawings, arrows FR indicate the front side in the longitudinal direction of the vehicle, arrow LH indicates the left side in the lateral direction of the vehicle, and arrow UP indicates the upper side in the vertical direction of the vehicle.

[0011] A vehicle to which the seat belt system of this embodiment is applied includes a rear seat 100 located behind the front seat (not shown). Further behind the rear seat 100, there is a retractor (not shown) equipped with a belt drum and pretensioner, which retracts the webbing 42 for occupant restraint. Furthermore, the vehicle body is provided with an anchor and a buckle (both not shown).

[0012] As shown in Figure 1, guide members 12 are provided near the outer ends in the vehicle width direction on the upper surface of the seat back 101 of the rear seat 100. That is, guide members 12 are provided near both the left and right ends of the upper surface of the seat back 101. The left guide member 12, which is provided near the left end of the upper surface of the seat back 101, will be described below. The right guide member 12 is symmetrical to the left guide member 12. The guide member 12 comprises a guide body 14, a movable body 34, and a spring member (biasing member) 40.

[0013] The guide body 14 is an integrally molded product having a fixed portion 16 and a guide portion 18. The fixed portion 16 is fixed to the upper part of the seat back 101. The guide portion 18, which has a substantially trapezoidal front shape, has a through hole 20 formed therein. As shown in Figures 1 and 2, the through hole 20 comprises a guide hole 22, which has a substantially arc-shaped front shape, and a movable allowance portion 28 recessed downward from the bottom of the guide hole 22. The bottom surface of the left end in the longitudinal direction of the guide hole 22 is formed by a first bottom surface (first support surface) 24, and the bottom surface of the right end of the guide hole 22 is formed by a second bottom surface (first support surface) 26 located above the first bottom surface 24. The front shape of the bottom surface 30 of the movable allowance portion 28 is substantially arc-shaped.

[0014] As shown in Figures 1 and 2, the front shape of the movable body 34 is approximately trapezoidal, and as shown in Figures 3 and 4, the cross-sectional shape of the movable body 34 is approximately U-shaped. The movable body 34 comprises an upper wall portion 36 and a pair of vertical wall portions 38 extending downward from both the front and rear edges of the upper wall portion 36. As shown in Figures 1 and 2, the front shape of the bottom surface component (second support surface) 37, which is the upper end surface of the upper wall portion 36, is approximately arc-shaped. The left-right dimension of the movable body 34 is slightly smaller than the left-right dimension of the movable allowable portion 28.

[0015] The movable body 34 is attached to the guide body 14 in such a manner that its upper wall portion 36 penetrates the through hole 20 in the front-rear direction. As shown in Figures 3 and 4, the distance between the inner surfaces of the pair of vertical wall portions 38 is greater than the thickness of the upper part of the guide portion 18.

[0016] As shown in Figures 3 and 4, a spring member 40 is provided between the bottom surface 30 of the guide portion 18 and the lower surface of the upper wall portion 36 of the movable body 34. That is, the lower end of the spring member 40 is fixed to the bottom surface 30, and the upper end of the spring member 40 is fixed to the lower surface of the upper wall portion 36. The spring member 40 is a compression coil spring whose axis is parallel to the vertical direction. When the spring member 40 is in a free state, the movable body 34 is in the normal position shown in Figures 1 and 3. When no downward external force of a predetermined value or greater is applied to the movable body 34, the position of the movable body 34 is maintained in the normal position by the spring member 40. On the other hand, when a downward external force of a predetermined value or greater is applied to the movable body 34, the spring member 40 elastically deforms, causing the movable body 34 to move to the operating position shown in Figures 2 and 4.

[0017] When the movable body 34 is in its normal position, as shown in Figure 1, the first bottom surface 24 and the second bottom surface 26 of the guide hole 22 and the bottom surface component 37 of the movable body 34 are continuous in a front view, and the webbing support surface 39 is formed by the first bottom surface 24, the second bottom surface 26 and the bottom surface component 37. On the other hand, when the movable body 34 is in its operating position, as shown in Figure 2, the bottom surface component 37 is located below the first bottom surface 24 and the second bottom surface 26. That is, a step is formed between the first bottom surface 24 and the second bottom surface 26 and the bottom surface component 37.

[0018] One end of a flexible, elongated strip-shaped webbing (belt) 42 is connected to the belt drum of the retractor. The other end of the webbing 42 extends upward from the retractor, passes forward through the through hole 20, and then extends downward. The other end of the webbing 42 is fixed to the anchor, and a tongue (not shown) is slidably attached to the portion of the webbing 42 located between the anchor and the guide member 12. As shown in Figures 1 and 2, the width of the webbing 42 is shorter than the longitudinal dimension of the guide hole 22. Therefore, the webbing 42 can move relative to the guide hole 22 along its longitudinal direction.

[0019] Among the configurations described above, the guide member 12, the webbing 42, the retractor, the buckle, and the tongue are components of the seat belt device 10.

[0020] Next, the operation of the seat belt device 10 will be described.

[0021] When a passenger is seated on the left side portion of the rear seat 100 and the tongue provided on the webbing 42 is pulled downward, the webbing 42 moves in the left - right direction within the guide hole 22. When the tongue is connected to the buckle, a part of the webbing 42 is worn on the passenger's body (chest, waist). At this time, as shown in FIGS. 1 and 3, one surface of the portion passing through the through - hole 20 of the webbing 42 contacts the bottom surface component 37 of the upper wall portion 36.

[0022] Here, assume that a vehicle collision occurs. At this time, due to the action of the belt drum and the pretensioner, the webbing 42 is pulled into the retractor, so a strong tension is applied to the webbing 42. Therefore, a downward external force greater than or equal to the predetermined value is applied from the webbing 42 to the moving body 34 (upper wall portion 36). Therefore, as shown in FIGS. 2 and 4, the spring member 40 elastically deforms, and the moving body 34 that was in the normal position instantaneously descends to the operating position.

[0023] By the way, when such a strong tension is applied to the webbing 42, the webbing 42 may try to move toward the second bottom surface 26 side within the guide hole 22. However, as shown in FIG. 2, a step is formed between the second bottom surface 26 and the bottom surface component 37 at this time. Therefore, the movement of the webbing 42 toward the second bottom surface 26 side is blocked by the wall 28A (see FIG. 2) on the second bottom surface 26 side of the movement allowance portion 28. Therefore, in this case, the possibility that the position of the webbing 42 in the guide hole 22 moves toward the second bottom surface 26 side is small. That is, the guiding state of the webbing 42 by the guide member 12 when the pretensioner operates is maintained in an appropriate state.

[0024] Although a seat belt device according to an embodiment has been described above, these can be modified as appropriate without departing from the spirit of the present invention.

[0025] For example, the guide member 12 may include a rubber member instead of the spring member 40 to bias the movable body 34 upward relative to the bottom surface 30. [Explanation of symbols]

[0026] 10. Seat belt system 12 Guide members 14 Guide body 22 Guide holes 24 1st bottom surface (1st support surface) 26 2nd bottom surface (1st support surface) 34 Mobile Units 36 Upper wall 37 Bottom component (second support surface) 39 Webbing support surface 40. Spring member (biasing member) 42 Webbing (Belt) 100 Rear seats

Claims

[Claim 1] A retractor is provided on the vehicle, has a pretensioner, and retracts the webbing for occupant restraint so that it can be extended, A guide member having a guide body fixed to the rear seat of the vehicle and having a guide hole through which the webbing is able to move relative to it, and a movable body that is able to move vertically relative to the guide body between a normal position and an operating position below the normal position, The first support surface, which constitutes a part of the bottom of the guide hole, The upper surface of the movable body, which, when the movable body is in the normal position, is continuous with the first support surface and together with the first support surface constitutes a webbing support surface, and when the movable body is in the operating position, is a second support surface located below the first support surface, A biasing member that, when no downward external force greater than a predetermined value is applied to the second support surface, positions the movable body in the normal position, and when a downward external force greater than the predetermined value is applied from the webbing to the second support surface, moves the movable body to the operating position by elastic deformation, A seat belt system equipped with a seat belt.

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