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 technology]

[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 a vehicle body above the pretensioner and having a guide hole through which the webbing passes so as to be relatively movable. The webbing extends upward from the pretensioner, passes through the guide hole, and then extends downward to be fastened to the body of an occupant seated in the vehicle seat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-230451 A Summary of the Invention [Problem to be solved by the invention]

[0004] The seat belt device of Patent Document 1 has room for improvement in terms of ensuring that the guide member guides the webbing in an appropriate state when the front tensioner is activated.

[0005] SUMMARY OF THE PRESENT EMBODIMENT In consideration of the above, an object of the present invention is to provide a seat belt device capable of properly guiding the webbing by the guide member when the print tensioner is activated. [Means for solving the problem]

[0006] a guide member fixed to a rear seat of the vehicle and having a guide hole through which the webbing passes so as to be movable relative to the guide body; and a movable body movable in a vertical direction relative to the guide body between a normal position and an operative position lower than the normal position; a first support surface constituting a part of a bottom of the guide hole; a second support surface which is an upper surface of the movable body and is continuous with the first support surface to form a webbing support surface together with the first support surface when the movable body is in the normal position, and which is located lower than the first support surface when the movable body is in the operative position; and a biasing member which positions the movable body at the normal position when a downward external force of a predetermined value or greater is not applied to the second support surface, and which elastically deforms to move the movable body to the operative position when a downward external force of a predetermined value or greater is applied from the webbing to the second support surface.

[0007] In the seatbelt device according to the invention recited in claim 1, when the print tensioner is activated, a downward external force of a predetermined value or more 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 is elastically deformed, causing the moving body to move to the operative position. Therefore, the second support surface is positioned below the first support surface of the guide hole of the guide main body. Therefore, the seatbelt device according to the invention recited in claim 1 can appropriately guide the webbing by the guide member when the print tensioner is activated. Effect of the Invention

[0008] The seat belt device according to the present invention can ensure that the guide member guides the webbing in an appropriate state when the print tensioner is activated. [Brief description of the drawings]

[0009] [Figure 1]2 is a schematic front view of an upper portion of the right side of a rear seat to which a seat belt device according to an embodiment is applied, a guide member, and a webbing. FIG. [Diagram 2] FIG. 2 is a front view similar to FIG. 1 when the print tensioner is activated. [Diagram 3] FIG. 3 is a schematic cross-sectional view taken along the arrow line 3-3 in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along the arrow line 4-4 in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0011] A vehicle to which the seat belt device of this embodiment is applied includes a rear seat 100 located behind a front seat (not shown). Behind the rear seat 100 is provided a retractor (not shown) that includes a belt drum and a pretensioner and winds up the webbing 42 for restraining an occupant so that it can be pulled out. Furthermore, an anchor and a buckle (both not shown) are provided on the vehicle body.

[0012] As shown in Fig. 1, a guide member 12 is provided near the outer end of the upper surface of a seat back 101 of a rear seat 100 in the vehicle width direction. That is, a guide member 12 is provided near both the left and right ends of the upper surface of the seat back 101. Below, the left guide member 12 provided near the left end of the upper surface of the seat back 101 will be described. The right guide member 12 is symmetrical to the left guide member 12. The guide member 12 includes a guide main body 14, a movable body 34, and a spring member (urging 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 portion of the seat back 101. A through hole 20 is formed in the guide portion 18, which has a substantially trapezoidal front shape. As shown in Figs. 1 and 2, the through hole 20 includes a guide hole 22, which has a substantially arc-shaped front shape, and a movement allowance portion 28 that is recessed downward from the bottom of the guide hole 22. The bottom surface of the left end portion 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 portion 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 movement 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 includes an upper wall portion 36 and a pair of vertical wall portions 38 extending downward from both front and rear edges of the upper wall portion 36. As shown in Figures 1 and 2, the front shape of the bottom surface forming portion (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 movement allowance portion 28.

[0015] The movable body 34 is attached to the guide body 14 in a manner that the upper wall portion 36 passes through 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 portion of the guide portion 18.

[0016] As shown in Figs. 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 moving 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 moving body 34 is located at the normal position shown in Figs. 1 and 3. When a downward external force of a predetermined value or more is not applied to the moving body 34, the position of the moving body 34 is maintained at the normal position by the spring member 40. On the other hand, when a downward external force of a predetermined value or more is applied to the moving body 34, the spring member 40 is elastically deformed, and the moving body 34 moves to the operating position shown in Figs. 2 and 4.

[0017] When the movable body 34 is in the normal position, as shown in Fig. 1, the first bottom surface 24 and the second bottom surface 26 of the guide hole 22 and the bottom surface constituent portion 37 of the movable body 34 are continuous in a front view, and the first bottom surface 24, the second bottom surface 26 and the bottom surface constituent portion 37 form a webbing support surface 39. On the other hand, when the movable body 34 is in the operating position, as shown in Fig. 2, the bottom surface constituent portion 37 is located lower than 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 constituent portion 37.

[0018] One end of the webbing (belt) 42, which is a flexible, long, belt-like member, 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 a portion of the webbing 42 located between the anchor and the guide member 12. As shown in Figs. 1 and 2, the width of the webbing 42 is shorter than the longitudinal dimension of the guide hole 22. Therefore, the webbing 42 is relatively movable within the guide hole 22 along the longitudinal direction of the guide hole 22.

[0019] Among the components described above, the guide member 12, the webbing 42, the retractor, the buckle and the tongue are the 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 of the rear seat 100 and a tongue provided on the webbing 42 is pulled downward, the webbing 42 moves left and right inside the guide hole 22. When the tongue is connected to the buckle, a part of the webbing 42 is attached to the torso (chest region, waist region) of the passenger. At this time, as shown in Figures 1 and 3, one surface of the portion of the webbing 42 passing through the through hole 20 comes into contact with the bottom surface forming portion 37 of the upper wall portion 36.

[0022] Now, assume that a vehicle collision occurs. At this time, the webbing 42 is pulled into the retractor by the action of the belt drum and the pretensioner, so that a strong tension is applied to the webbing 42. As a result, a downward external force of a magnitude equal to or greater than the above-mentioned predetermined value is applied from the webbing 42 to the moving body 34 (upper wall portion 36). As a result, as shown in Figures 2 and 4, the spring member 40 is elastically deformed, and the moving body 34, which is located in the normal position, instantaneously descends to the actuated position.

[0023] Incidentally, when such strong tension is applied to the webbing 42, the webbing 42 may try to move inside the guide hole 22 toward the second bottom surface 26. However, as shown in FIG. 2, at this time, a step is formed between the second bottom surface 26 and the bottom surface forming portion 37. Therefore, the movement of the webbing 42 toward the second bottom surface 26 is prevented by the wall 28A (see FIG. 2) of the movement permitting portion 28 on the second bottom surface 26 side. Therefore, in this case, there is little risk that the position of the webbing 42 in the guide hole 22 will move toward the second bottom surface 26. That is, the guide state of the webbing 42 by the guide member 12 when the print tensioner is activated is maintained in an appropriate state.

[0024] Although the seat belt device according to the embodiment has been described above, the design thereof can be appropriately modified without departing from the gist of the present invention.

[0025] For example, the guide member 12 may be provided with a rubber member, instead of the spring member 40, which biases the moving body 34 upward relative to the bottom surface 30. [Explanation of symbols]

[0026] 10 Seat belt device 12 Guide member 14 Guide body 22 Guide hole 24 1st bottom surface (1st support surface) 26 2nd bottom surface (1st support surface) 34 Mobile 36 Upper wall 37 Bottom component (second support surface) 39 Webbing support surface 40 Spring member (biasing member) 42 Webbing (belt) 100 Back seat

Claims

[Claim 1] a retractor provided in the vehicle, the retractor having a pretensioner and winding up a webbing for restraining an occupant so that the webbing can be pulled out; a guide member fixed to a rear seat of the vehicle, the guide member including a guide body having a guide hole through which the webbing passes so as to be relatively movable, and a movable body movable in a vertical direction relative to the guide body between a normal position and an operating position lower than the normal position; A first support surface that constitutes a part of a bottom portion of the guide hole; a second support surface that is an upper surface of the movable body, that is continuous with the first support surface and constitutes a webbing support surface together with the first support surface when the movable body is in the normal position, and that is positioned below the first support surface when the movable body is in the operating position; a biasing member that positions the movable body at the normal position when a downward external force of a magnitude equal to or greater than a predetermined value is not applied to the second support surface, and that moves the movable body to the actuated position by elastically deforming when a downward external force of a magnitude equal to or greater than the predetermined value is applied from the webbing to the second support surface; A seat belt device comprising:

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