Webbing winding device

Abstract

To provide a webbing winding device that can improve the ease of assembly when rotatably attaching the base end of a protective member to a pair of leg plates of a frame. [Solution] Holes 36 and 37 are formed through the upper parts of a pair of leg plates 32L and 32R of the frame 32, and the shafts 42 and 43 of the protector 40 are inserted into the holes 36 and 37. The protector 40 has a pair of shafts 42 and 43, a pair of side parts 44 and 45, a front end connecting part 46, and a base end connecting part 48, and the shafts 42 and 43 are formed on the base end sides of the side parts 44 and 45. The front end connecting part 46 connects the front ends 44C of the pair of side parts 44 and 45, and a through-hole 46H is formed through the front end connecting part 46 through which the webbing 22 extending from the spool 34 passes. The base end connecting part 48 connects the base end portions of the pair of side parts 44 and 45 and is formed in a thin plate shape with the direction perpendicular to the front surface 48A facing the webbing 22 as the plate thickness direction, and is flexible.

Description

Technical Field

[0001] The present invention relates to a webbing winding device that winds a webbing worn by a vehicle occupant.

Background Art

[0002] The following Patent Document 1 discloses a technique related to a webbing winding device provided with a protector as a protective member. In this prior art, the protector has a rotating portion provided on the entire circumference of the winding shaft between a pair of leg plates on both sides in the width direction of the frame and rotatable in the circumferential direction of the winding shaft, and a passing portion provided integrally with the rotating portion through which the webbing extending from the winding shaft passes.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, there may be a configuration in which the base end portion of the protective member is rotatably attached to the upper portions of a pair of leg plates of the frame so that the protective member extends from the frame. However, in such a configuration, there is room for improvement in terms of assembly property.

[0005] In consideration of the above facts, an object of the present invention is to obtain a webbing winding device capable of improving the assembly property when rotatably attaching the base end portion of the protective member to a pair of leg plates of the frame.

Means for Solving the Problems

[0006] A webbing winding device according to a first aspect of the present invention comprises a winding shaft for winding webbing to be attached to a crew member; a frame having a pair of leg plates arranged on both sides of the winding shaft in the axial direction with the axial direction of the winding shaft facing each other, and having holes formed through each of the upper parts of the pair of leg plates facing each other; a pair of shaft portions inserted into the holes of the pair of leg plates, respectively; a pair of elongated side portions with the shaft portions formed at the base end; a tip-side connecting portion connecting the tip portions of the pair of side portions and having a through portion formed through which the webbing extending from the winding shaft passes; and a flexible base-side connecting portion connecting the base-end portions of the pair of side portions and formed in a thin plate shape with the plate thickness direction being perpendicular to the front surface which is the surface facing the webbing.

[0007] A second aspect of the webbing winding device of the present invention is a webbing winding device of the first aspect of the present invention, wherein an extension is formed at the base end of the pair of side portions, extending from the portion to which the base end connecting portion is connected in the direction toward the front surface of the base end connecting portion, the pair of shaft portions are formed on the outer surface side opposite to the inner surface side opposite to the inner surface side of the pair of extension portions, and the base end connecting portion is offset in the plate thickness direction of the base end connecting portion with respect to the pair of shaft portions when viewed from the axial direction of the pair of shaft portions.

[0008] A third aspect of the webbing winding device of the present invention is a webbing winding device of the first or second aspect of the present invention, wherein the base end connecting portion is set to be thinner in the intermediate portion in the direction connecting the base end portions of the pair of side portions than in other portions.

[0009] A webbing winding device according to a fourth aspect of the present invention is a webbing winding device according to any one of the first to third aspects of the present invention, wherein two elongated vertical connecting portions are formed between the pair of side portions, on both sides of the central position in the spacing direction, connecting the front end connecting portion and the base end connecting portion, and the distance between the two vertical connecting portions is set to be smaller than the width of the webbing.

[0010] A fifth aspect of the present invention is a webbing winding device according to any one of the first to fourth aspects of the present invention, wherein the end face of the tip-side connecting portion, which is located on the winding shaft side of the through portion than the through portion, has an inclined portion that is inclined toward the through portion side toward the side adjacent to the webbing. [Effects of the Invention]

[0011] In the webbing winding device according to the first aspect of the present invention, a winding shaft winds up webbing to be attached to an occupant. A pair of leg plates are arranged on both sides of the winding shaft in the axial direction, with the axial direction of the winding shaft facing each other, and the frame having the pair of leg plates supports both ends of the winding shaft. Holes are formed through the upper parts of the pair of leg plates on opposite sides. A protective member has a pair of shaft portions, a pair of side portions, a tip-side connecting portion, and a base-side connecting portion, and the shaft portions are inserted into the holes of the pair of leg plates, respectively. The side portions are formed in an elongated shape, with the shaft portion formed on the base end side. The tip-side connecting portion connects the tip portions of the pair of side portions, and a through portion is formed through this tip-side connecting portion through which the webbing extending from the winding shaft passes. Furthermore, the base-side connecting portion connects the base end portions of the pair of side portions and is formed in a thin plate shape with the direction perpendicular to the front surface, which is the surface facing the webbing, as the plate thickness direction, and is flexible. Therefore, when assembling the protective member to the pair of leg plates, the base end connecting portion can be flexed, and the elastic return of the base end connecting portion allows the shaft portion to be inserted into the hole. Furthermore, the elastic force of the base end connecting portion prevents the shaft portion from coming out of the hole. Thus, for example, there is no need to provide a bent portion at the tip of the shaft portion to prevent it from coming out, and the deterioration of assembly caused by providing such a bent portion can be avoided. As a result, the assembly of the base end of the protective member when rotatably attaching it to the pair of leg plates of the frame can be improved.

[0012] In the webbing winding device of the second aspect of the present invention, extensions are formed at the base ends of a pair of side portions, extending in a direction toward the front surface of the base end connecting portion from the portion to which the base end connecting portion is connected. The pair of shaft portions are formed on the outer surfaces opposite to the inner surfaces that face each other in the pair of extension portions, and the base end connecting portion is positioned offset in the plate thickness direction of the base end connecting portion relative to the pair of shaft portions when viewed from the axial direction of the pair of shaft portions. Therefore, even when the amount of webbing wound on the winding shaft increases, it is possible to avoid the webbing coming into contact with the base end connecting portion. In addition, the amount of bending required when flexing the base end connecting portion to assemble the protective member to the pair of leg plates is small.

[0013] In the webbing winding device according to the third aspect of the present invention, the base end connecting portion is set to be thinner in the intermediate portion in the direction connecting the base end portions of the pair of side portions than in other portions, so that the base end connecting portion can be easily bent when assembling the protective member to the pair of leg plates.

[0014] In the webbing winding device of the fourth aspect of the present invention, two elongated vertical connecting sections are formed between a pair of side sections, connecting the tip-side connecting section and the base-side connecting section on both sides of the central position in the spacing direction, and the distance between the two vertical connecting sections is set to be smaller than the width of the webbing, so that when passing the webbing through the penetration section, it is possible to pass the webbing through the penetration section while the webbing is resting on the two vertical connecting sections.

[0015] In the fifth aspect of the present invention, the webbing winding device has an inclined portion on the end face of the tip-side connecting portion that is positioned on the winding shaft side of the through portion than the through portion, so that when passing the webbing through the through portion, the tip of the webbing is less likely to get caught on the end face of the tip-side connecting portion that is positioned on the winding shaft side of the through portion than the through portion, making it easier to pass the webbing through the through portion. [Brief explanation of the drawing]

[0016] [Figure 1]It is a cross-sectional view showing the upper part of a seatback in which a webbing winding device according to an embodiment of the present invention is mounted inside. [Figure 2] It is a left side view of the webbing winding device of FIG. 1. [Figure 3] It is a perspective view of the webbing winding device of FIG. 1 seen from the front left diagonal side. [Figure 4] It is a perspective view of the protector of FIG. 3 seen from the front and the lower right diagonal side. [Figure 5] It is a perspective view of the protector of FIG. 3 seen from the front and the upper left diagonal side. [Figure 6] It is a perspective view of the protector of FIG. 3 seen from the rear and the lower left diagonal side. [Figure 7] It is a perspective view of the protector of FIG. 3 seen from the upper right diagonal side. [Figure 8A] It is a perspective view showing a state in which one shaft portion of the protector is inserted into the hole portion of the foot plate in order to assemble the protector to the frame. [Figure 8B] It is a perspective view showing a state in which the proximal end side connecting portion of the protector is bent with a finger from the state of FIG. 8A. [Figure 8C] It is a perspective view showing a state in which the other shaft portion of the protector is moved to directly below the hole portion of the foot plate from the state of FIG. 8B. [Figure 8D] It is a perspective view showing a state in which the other shaft portion of the protector is inserted into the hole portion of the foot plate by elastically returning the protector from the state of FIG. 8C. [Figure 9A] It is a diagram schematically showing the amount of bending of the proximal end side connecting portion at the time of assembly in a protector according to another example. [Figure 9B] It is a diagram schematically showing the amount of bending of the proximal end side connecting portion at the time of assembly in a protector according to an embodiment. [Figure 10] It is a side view of the webbing winding device showing a state in which the webbing passes through the passing portion of the protector. [Figure 11] It is a perspective view of the webbing winding device shown in the posture when the webbing passes through the passing portion of the protector. [Figure 12]This is a rear view showing the deformation of the protector when a diagonal tensile force is applied to the webbing. [Modes for carrying out the invention]

[0017] A webbing winding device according to one embodiment of the present invention will be described with reference to Figures 1 to 12. Figure 1 shows a longitudinal cross-sectional view, seen from the side, of one side (including the shoulder portion) of the upper part of a seat back 12 in the left-right direction, in which the webbing winding device 30 according to the embodiment is mounted.

[0018] The seat back 12 is part of the vehicle seat 10 and supports the back of the seated occupant. In Figure 1, arrow FR indicates the front side of the vehicle seat 10, and arrow UP indicates the upper side of the vehicle seat 10. The vehicle seat 10 is composed of a seat cushion (not shown) that supports the buttocks and thighs of the seated occupant. The seat back 12 has a seat back frame 14 which is its skeletal member, a seat back pad 16 which is placed over the seat back frame 14, and a seat back surface 18 which covers the seat back pad 16.

[0019] The webbing winding device 30, mounted inside the seat back 12, is attached to a part of the seat back frame 14. Note that in Figure 1, the webbing winding device 30 is shown in a simplified form for convenience. The seat belt system 20 equipped with the webbing winding device 30 is a three-point seat belt system. In the seat belt system 20, the long, strip-shaped webbing 22 worn by the occupant has one end in the longitudinal direction locked to a spool 34, which serves as the winding shaft of the webbing winding device 30, and the other end in the longitudinal direction locked to an anchor member provided on one side of the seat cushion (not shown). Furthermore, a tongue plate (not shown) is attached to the middle of the webbing 22 in the longitudinal direction, and the tongue plate can be connected to a buckle (not shown) provided on the other side of the seat cushion (not shown). The webbing winding device 30 will be described later.

[0020] A bezel 24 is provided on one shoulder portion of the seat back 12 in the left-right direction. The bezel 24 serves as a guide for the webbing 22, and a slit-shaped hole 24H is formed through it for the webbing 22 to pass through. The bezel 24 is fixed to a part of the seat back frame 14 (not shown) with screws or the like via a component.

[0021] Figure 2 shows a left side view of the webbing winding device 30, and Figure 3 shows a perspective view of the webbing winding device 30 viewed from the left front. Note that the basic configuration of the webbing winding device 30 (excluding the protector 40 as a protective member and related parts, which will be described later) can be based on a known basic configuration (for example, the basic configuration of a webbing winding device disclosed in Japanese Patent Application Publication No. 2014-162290, etc.). Therefore, a detailed explanation of the basic configuration of the webbing winding device 30 will be omitted as appropriate.

[0022] As shown in Figures 2 and 3, the webbing winding device 30 is equipped with a frame 32, which is made of metal (for example, steel). The frame 32 is equipped with a flat back plate 32B that is fixed to the seat back frame 14 (see Figure 1). A pair of leg plates 32L and 32R are formed from both ends of the back plate 32B shown in Figure 3, which are bent at approximately right angles in the same direction. The pair of leg plates 32L and 32R constitute a part of the frame 32 and are arranged on both sides of the spool 34 in the axial direction, with the spool 34's axial direction facing the frame 32, and the frame 32 supports both ends of the spool 34.

[0023] The spool 34 is positioned between a pair of leg plates 32L and 32R and is formed in a substantially cylindrical shape with its axial direction aligned with the opposing directions of the pair of leg plates 32L and 32R. It is equipped with a spool shaft 34A that constitutes the axial core. In addition, flange portions 34F (one of the flange portions is not shown) are formed at both axial ends of the spool 34 as extensions that extend radially outward.

[0024] When the spool 34 is rotated in one direction, the winding direction, around its central axis, the webbing 22 is wound in layers around the outer circumference of the spool 34, starting from its longitudinal base end. When the webbing 22 is pulled toward its tip, the webbing 22 wound on the spool 34 is pulled out, and the spool 34 rotates in the pulling direction, opposite to the winding direction.

[0025] Meanwhile, the frame 32 has bearing holes 36 and 37 formed through the upper parts of a pair of leg plates 32L and 32R, respectively, on opposite sides. The holes 36 and 37 are for assembling the protector 40. The protector 40 is made of resin and has a pair of shafts 42 and 43 that are inserted into the holes 36 and 37 of the pair of leg plates 32L and 32R, respectively. The protector 40 as a whole extends upward from the frame 32 and inclined forward, and is rotatably positioned around the axes of the pair of shafts 42 and 43.

[0026] Figure 4 shows a perspective view of the protector 40 from the front and diagonally downward to the right, and Figure 5 shows a perspective view of the protector 40 from the front and diagonally upward to the left. Furthermore, Figure 6 shows a perspective view of the protector 40 from the rear and diagonally downward to the left, and Figure 7 shows a perspective view of the protector 40 from the diagonally rear to the right.

[0027] As shown in Figures 4 and 5, the protector 40 has a pair of elongated side portions 44 and 45, with shaft portions 42 and 43 formed on the base end 44A and 45A sides of the side portions 44 and 45. The pair of side portions 44 and 45 are formed parallel to each other. Front extension portions 44F and 45F are formed at the base end 44A and 45A of the pair of side portions 44 and 45, extending forward. The pair of shaft portions 42 and 43 are formed on the outer surface 44F2 and 45F2 sides opposite to the inner surface 44F1 and 45F1 sides of the pair of front extension portions 44F and 45F. In addition, rear extension portions 44R and 45R are formed at the base end 44A and 45A of the pair of side portions 44 and 45, extending backward. The rear extensions 44R and 45R are formed with stopper protrusions S1 and S2 that project outward in the width direction (left-right direction) of the protector 40. The protrusions S1 and S2 are designed to contact the upper end surfaces of the leg plates 32L and 32R of the frame 32 shown in Figure 3 when the protector 40 is rotated to a predetermined angle towards the rear.

[0028] As shown in Figures 4 and 5, the pair of side portions 44 and 45 are rod-shaped portions 44B and 45B, with the portions excluding both ends in the longitudinal direction being rod-shaped. The cross-sectional shape of the rod-shaped portions 44B and 45B perpendicular to the longitudinal direction is, for example, approximately rectangular, and the length in the width direction (left-right direction) is set to be smaller than the length in the thickness direction perpendicular to it. In addition, the tip portions 44C and 45C of the pair of side portions 44 and 45 have protruding pieces 44P and 45P that project forward. The protruding pieces 44P and 45P are, for example, configured to include a portion in which the amount of protrusion gradually increases from the side connected to the rod-shaped portions 44B and 45B.

[0029] The tip portions 44C and 45C of the pair of side portions 44 and 45 are connected by a tip-side connecting portion 46. The tip-side connecting portion 46 is formed with its longitudinal direction perpendicular to the pair of side portions 44 and 45 in a front view (in other words, the width direction (left-right direction) of the protector 40). A through portion 46H is formed through the tip-side connecting portion 46 through which the webbing 22 extending from the spool 34 shown in Figure 3 passes. In other words, the tip-side connecting portion 46 is an element that can be understood as a part of the belt guide portion. As shown in Figure 4, the through portion 46H extends along the longitudinal direction of the tip-side connecting portion 46. To explain in more detail, in this embodiment, as an example, the tip-side connecting portion 46 has a base portion 46A that connects the bases of the tip portions 44C and 45C of the side portions 44 and 45, and a tip component portion 46B that connects the protruding tip portions of the protruding pieces 44P and 45P, with a through portion 46H between the base portion 46A and the tip component portion 46B.

[0030] Furthermore, the protector 40 has an inclined portion 46S on the end face 46E of the tip-side connecting portion 46, which is located on the spool 34 (see Figure 3) side (i.e., the lower side in Figure 4) of the through portion 46H (i.e., the lower side in Figure 4), and which is inclined toward the through portion 46H side toward the side adjacent to the webbing 22 (front side). In this embodiment, the inclined portion 46S is formed on the base portion 46A of the tip-side connecting portion 46.

[0031] As shown in Figures 4 and 5, the base end portions 44A and 45A of the pair of side portions 44 and 45 are connected in the width direction (left-right direction) by a base end connecting portion 48. The base end connecting portion 48 is connected to the portion of the base end portions 44A and 45A of the pair of side portions 44 and 45 between the front extension portions 44F and 45F and the rear extension portions 44R and 45R. The base end connecting portion 48 is formed in a thin plate shape with the thickness direction being perpendicular to the front surface 48A, which is the surface facing the webbing 22 (see Figure 3), and is therefore flexible.

[0032] As shown in Figure 6, the base end connecting portion 48 has a middle portion 48M in the connecting direction W, which is the direction in which the base end portions 44A and 45A of the pair of side portions 44 and 45 are connected, that is thinner than the other portions. To further explain, in this embodiment, the rear surface 48B of the base end connecting portion 48 has a shape in which the middle portion 48M in the connecting direction W is recessed compared to the portions 48S on both sides of the connecting direction W. On the rear surface 48B of the base end connecting portion 48, the boundary portion 48N between the relatively thinned middle portion 48M in the connecting direction W and the relatively thicker portions 48S on both sides of the connecting direction W is formed in an inclined shape, for example. Note that the connecting direction W in this embodiment is the same direction as the width direction (left-right direction) of the protector 40.

[0033] Furthermore, as shown in Figures 4 and 5, the front extensions 44F and 45F at the base ends 44A and 45A of the aforementioned pair of side portions 44 and 45 are portions that extend in the direction toward the front surface 48A of the base end connecting portion 48 from the portion to which the base end connecting portion 48 is connected. In addition, the base end connecting portion 48 is positioned offset (shifted) in the plate thickness direction of the base end connecting portion 48 relative to the pair of shaft portions 42 and 43 when viewed from the axial direction of the pair of shaft portions 42 and 43 (not shown), so that the webbing 22 does not come into contact with the base end connecting portion 48 even when the amount of webbing 22 wound onto the spool 34 shown in Figure 3 is at its maximum.

[0034] Furthermore, as shown in Figures 4 and 5, two elongated vertical connecting sections 50 and 51 are formed between the pair of side sections 44 and 45, connecting the tip-side connecting section 46 and the base-side connecting section 48, respectively, on either side of the central position CL in the spacing direction K. The two vertical connecting sections 50 and 51 are formed in a rod shape and are formed parallel to the rod-shaped sections 44B and 45B of the pair of side sections 44 and 45. The cross-sectional shape of the vertical connecting sections 50 and 51 perpendicular to the longitudinal direction is, for example, approximately rectangular, and except for the portion near the base-side connecting section 48, the length in the width direction (left-right direction) is set to be smaller than the length in the thickness direction perpendicular to it. The distance between the two vertical connecting sections 50 and 51 is set to be smaller than the width of the webbing 22 (see Figure 3). Furthermore, as shown in Figures 6 and 7, the two vertical connecting portions 50 and 51 are connected to the base-side connecting portion 48 by portions 48S on both sides in the width direction that are formed to be relatively thicker at the base-side connecting portion 48.

[0035] Next, an example of how to assemble the protector 40 onto the frame 32 shown in Figure 3 will be explained using Figures 8A to 8D.

[0036] When assembling the protector 40 to the frame 32, first, as shown in Figure 8A, grasp the base end connecting portion 48 of the protector 40 with three fingers: thumb F1, index finger F2, and ring finger F3, and insert one shaft portion 42 of the protector 40 into the hole 37 of the leg plate 32R on one side (the lower side in the figure) of the frame 32. Next, as shown in Figure 8B, use the three fingers: thumb F1, index finger F2, and ring finger F3 to bend the base end connecting portion 48 of the protector 40 so that its front surface 48A becomes concave.

[0037] Next, as shown in Figure 8C, with the base end connecting portion 48 bent, the other shaft portion 43 of the protector 40 is moved to the position opposite (directly below in the figure) the hole 36 of the other leg plate 32L of the frame 32. Then, as shown in Figure 8D, the force bending the base end connecting portion 48 is released, allowing the base end connecting portion 48 to elastically return to its original position, thereby inserting the other shaft portion 43 of the protector 40 into the hole 36 of the other leg plate 32L of the frame 32. In this way, the protector 40 is assembled to the frame 32.

[0038] Next, the operation of this embodiment will be described.

[0039] In the webbing winding device 30 shown in Figure 3, a spool 34 winds up the webbing 22 that is attached to the crew. A pair of leg plates 32L and 32R are arranged on both sides of the spool 34 in the axial direction, with the axial direction of the spool 34 facing the other, and a frame 32 having the pair of leg plates 32L and 32R supports both ends of the spool 34. Holes 36 and 37 are formed through the upper parts of the pair of leg plates 32L and 32R on opposite sides. The protector 40 has a pair of shaft portions 42 and 43, a pair of side portions 44 and 45, a tip-side connecting portion 46, and a base-side connecting portion 48, and the shaft portions 42 and 43 are inserted into the holes 36 and 37 of the pair of leg plates 32L and 32R, respectively. As a result, the protector 40 is movable around the axis of the pair of shaft portions 42 and 43.

[0040] As shown in Figures 4 and 5, in the protector 40, the side portions 44 and 45 are formed in an elongated shape, and shaft portions 42 and 43 are formed on the base end 44A and 45A sides. The tip connecting portion 46 connects the tip portions 44C of the pair of side portions 44 and 45, and a through portion 46H is formed through this tip connecting portion 46 through which the webbing 22 extending from the spool 34 shown in Figure 3 passes. Here, as mentioned above, the protector 40 is movable around the axis of the pair of shaft portions 42 and 43, so the position of the through portion 46H can be changed according to the amount of webbing 22 wound onto the spool 34 (see Figure 1).

[0041] Furthermore, as shown in Figures 4 and 5, the base end connecting portion 48 of the protector 40 connects the base end portions 44A and 45A of the pair of side portions 44 and 45, and is formed in a thin plate shape with the thickness direction perpendicular to the front surface 48A facing the webbing 22 (see Figure 3), and is flexible. Therefore, when assembling the protector 40 to the pair of leg plates 32L and 32R shown in Figure 8A, the base end connecting portion 48 can be bent with fingers F1, F2, and F3 as shown in Figures 8B and 8C, and the elastic return of the base end connecting portion 48 as shown in Figure 8D allows the shaft portions 42 and 43 to be inserted into the holes 36 and 37. In addition, the elastic force of the base end connecting portion 48 prevents the shaft portions 42 and 43 from coming out of the holes 36 and 37. Therefore, for example, there is no need to provide a bent portion to prevent detachment at the tip of the shaft portion 42, 43, and the deterioration of assembly caused by providing such a bent portion can be avoided. As a result, assembly can be improved when rotatably attaching the base end of the protector 40 to the pair of leg plates 32L, 32R of the frame 32.

[0042] Furthermore, in this embodiment, as shown in Figures 4 and 5, front extensions 44F and 45F are formed at the base ends 44A and 45A of the pair of side portions 44 and 45, extending from the portion to which the base end connecting portion 48 is connected in the direction toward the front surface 48A of the base end connecting portion 48. The pair of shaft portions 42 and 43 are formed on the outer surfaces 44F2 and 45F2 of the pair of front extensions 44F and 45F, opposite to the inner surfaces 44F1 and 45F1 that face each other. The base end connecting portion 48 is positioned offset in the thickness direction of the base end connecting portion 48 relative to the pair of shaft portions 42 and 43 when viewed from the axial direction of the pair of shaft portions 42 and 43 (not shown). Therefore, even when the amount of webbing 22 wound on the spool 34 shown in Figure 3 increases, it is possible to avoid the webbing 22 coming into contact with the base end connecting portion 48, which contributes to miniaturizing the entire webbing winding device 30. In addition, the amount of bending required when flexing the base end connecting portion 48 to assemble the protector 40 to the pair of leg plates 32L and 32R is reduced.

[0043] Here, the amount of bending of the base end connecting portion 48 during assembly of the protector 40 will be explained in detail using Figures 9A and 9B. Figure 9A is a schematic diagram showing the amount of bending of the base end connecting portion 148 during assembly in a protector 140 according to another example, and Figure 9B is a schematic diagram showing the amount of bending of the base end connecting portion 48 during assembly in the protector 40 according to this embodiment.

[0044] In the protector 140 of another example shown in Figure 9A, the base end connecting portion 148 is not offset in the plate thickness direction of the base end connecting portion 148 relative to the pair of shaft portions 142 and 143 when viewed from the axial direction of the pair of shaft portions 142 and 143, in the state before the base end connecting portion 148 is bent (not shown). Therefore, the amount of bending (bending angle θ1) when bending the base end connecting portion 148 in order to assemble the protector 140 to the pair of leg plates 32L and 32R must be increased. In contrast, in the protector 40 according to this embodiment shown in Figure 9B, before the base end connecting portion 48 is bent (see Figures 4 to 7, etc.), the base end connecting portion 48 is offset in the plate thickness direction of the base end connecting portion 48 relative to the pair of shaft portions 42 and 43 when viewed from the axial direction of the pair of shaft portions 42 and 43. Therefore, compared to the case of the other example shown in Figure 9A, it is possible to reduce the amount of bending (bending angle θ2) when bending the base end connecting portion 48 in order to assemble the protector 40 shown in Figure 9B to the pair of leg plates 32L and 32R.

[0045] Furthermore, as shown in Figure 6, etc., in this embodiment, the base end connecting portion 48 is set to be thinner in the intermediate portion 48M in the connecting direction W, which is the direction in which the base end portions 44A and 45A of the pair of side portions 44 and 45 are connected, than in other portions. Therefore, when assembling the protector 40 to the pair of leg plates 32L and 32R (see Figure 8A, etc.), the base end connecting portion 48 can be easily bent.

[0046] Furthermore, in this embodiment, two elongated vertical connecting sections 50 and 51 are formed between the pair of side sections 44 and 45, connecting the tip-side connecting section 46 and the base-side connecting section 48 on both sides of the central position CL in the spacing direction K, and the distance between the two vertical connecting sections 50 and 51 is set to be smaller than the width of the webbing 22 (see Figure 3). Therefore, as shown in Figures 10 and 11, when passing the webbing 22 through the through section 46H from the side closer to the spool 34 (see Figure 11) (in the direction of arrow P), it is possible to pass the webbing 22 through the through section 46H while the webbing 22 rests on the two vertical connecting sections 50 and 51 shown in Figure 11.

[0047] Furthermore, in this embodiment, as shown in Figures 6 and 7, the two vertical connecting portions 50 and 51 are connected to the base-side connecting portion 48 by portions 48S on both sides in the width direction that are relatively thicker at the base-side connecting portion 48. With this configuration, when molding the protector 40 in a mold, good fluidity of the resin can be ensured in the area of ​​the mold where the two vertical connecting portions 50 and 51 are molded, and intermediate solidification of the resin can be prevented.

[0048] Furthermore, as shown in Figure 4, in this embodiment, the tip-side connecting portion 46 has an inclined portion 46S on the end face 46E, which is located on the spool 34 side (see Figure 3) (i.e., the lower side in Figure 4) of the through portion 46H, and is inclined toward the through portion 46H side toward the side adjacent to the webbing 22 (see Figure 3). Therefore, as shown in Figure 11, when passing the webbing 22 through the through portion 46H, the tip of the webbing 22 is less likely to get caught on the end face 46E, which is located on the spool 34 side of the tip-side connecting portion 46H, making it easier to pass the webbing 22 through the through portion 46H.

[0049] Furthermore, as shown in Figure 6, etc., in this embodiment, as an example, the cross-sectional shape perpendicular to the longitudinal direction of most of the rod-shaped portions 44B, 45B and vertical connecting portions 50, 51 of the pair of side portions 44, 45 (excluding the portion near the base end connecting portion 48) is set such that the length in the width direction (left-right direction) is smaller than the length in the thickness direction perpendicular to it. Therefore, as shown in Figure 12, when the webbing 22 is pulled in an oblique direction (see arrow D) and a lateral load F is applied from the webbing 22 to the penetration portion 46H (see Figure 3) of the tip-side connecting portion 46 of the protector 40, the rod-shaped portions 44B, 45B and vertical connecting portions 50, 51 of the pair of side portions 44, 45 undergo elastic deformation. As a result, deformation of the surrounding portion of the shaft portions 42, 43 can be suppressed, and the shaft portions 42, 43 can be prevented from coming loose.

[0050] The webbing 22 may be pulled diagonally (see arrow D) for example, when the webbing 22 is pulled towards one end in the direction of extension of the slit of the bezel 24 shown in Figure 1 (the direction perpendicular to the plane of the paper in Figure 1), and the end portion of the webbing 22 in the width direction becomes trapped inside the J-shaped bend in the slit (not shown).

[0051] (Supplementary explanation of the embodiment) In the embodiments shown in Figures 1 to 8D and Figures 9B to 12, the pair of shaft portions 42 and 43 are formed on the outer surfaces 44F2 and 45F2 of the front extension portions 44F and 45F, and the base end connecting portion 48 is positioned offset in the plate thickness direction of the base end connecting portion 48 relative to the pair of shaft portions 42 and 43 when viewed from the axial direction of the pair of shaft portions 42 and 43. While this configuration is preferred, as a modification, a configuration can also be adopted in which the base end connecting portion (48) is not offset in the plate thickness direction of the base end connecting portion (48) relative to the pair of shaft portions (42 and 43) when viewed from the axial direction of the pair of shaft portions (42 and 43).

[0052] Furthermore, in the above embodiment, the base end connecting portion 48 has a thinner intermediate portion 48M in the connecting direction W, which is the direction in which the base end portions 44A and 45A of the pair of side portions 44 and 45 are connected, compared to the other portions. While this configuration is preferred, as a modification, the base end connecting portion may have a different configuration from the above embodiment, for example, by having a constant plate thickness.

[0053] Furthermore, in the above embodiment, two vertical connecting portions 50 and 51 are formed between the pair of side portions 44 and 45, on both sides with respect to the central position CL in the spacing direction K, connecting the tip-side connecting portion 46 and the base-side connecting portion 48, respectively. While this configuration is preferred, as a modification, a configuration in which one or more vertical connecting portions connecting the tip-side connecting portion (46) and the base-side connecting portion (48) are formed can also be adopted, as can a configuration in which no vertical connecting portions are formed.

[0054] Furthermore, in the above embodiment, the tip-side connecting portion 46 has an inclined portion 46S on the end face 46E, which is located on the spool 34 side of the through portion 46H, and which is inclined toward the through portion 46H side toward the side adjacent to the webbing 22. While this configuration is preferred, as a modified example, a configuration in which such an inclined portion 46S is not provided can also be adopted.

[0055] Furthermore, the above embodiments and the various modifications described above can be combined as appropriate.

[0056] Although an example of the present invention has been described above, the present invention is not limited to the above, and it is of course possible to implement it in various ways without departing from its spirit. [Explanation of Symbols]

[0057] 22...Webbing, 30...Webbing winding device, 32...Frame, 32L, 32R...Leg plate, 34...Spool (winding shaft), 36, 37...Hole, 40...Protector (protective member), 42, 43...Shaft section, 44, 45...Side section, 44F, 45F...Front extension section (extension section), 44F1, 45F1...Inner surface, 44F2, 45F2...Outer surface, 46...Tip-side connecting section, 46H...Through section, 46E...End face, 46S...Inclined section, 48...Base-side connecting section, 48A...Front surface, 48M...Intermediate section in the connecting direction (intermediate section in the direction connecting the base end portions of a pair of side sections), 50...Vertical connecting section, CL...Center position in the spacing direction, K...Spacing direction, W...Connecting direction (direction connecting the base end portions of a pair of side sections)

Claims

1. A winding shaft for winding the webbing attached to the crew, A frame having a pair of leg plates positioned on both sides of the winding shaft in the axial direction with the winding shaft's axial direction facing each other, supporting both ends of the winding shaft, with holes formed through the upper parts of the pair of leg plates in their opposing portions, A protective member having: a pair of shaft portions inserted into the holes of the pair of leg plates; a pair of elongated side portions formed on the base end side of the shaft portions; a tip-side connecting portion connecting the tip ends of the pair of side portions and having a through portion formed through which the webbing extending from the winding shaft passes; and a flexible base-side connecting portion connecting the base end portions of the pair of side portions and formed in a thin plate shape with the thickness direction perpendicular to the front surface which is the surface facing the webbing. A webbing winding device equipped with [a specific feature].

2. At the base ends of the pair of side portions, an extension is formed that extends from the portion to which the base end connecting portion is connected in the direction toward the front surface of the base end connecting portion. The pair of shaft portions are formed on the outer surface side opposite to the inner surface side facing each other in the pair of extension portions. The webbing winding device according to claim 1, wherein the base end connecting portion is positioned offset in the plate thickness direction of the base end connecting portion with respect to the pair of shafts when viewed from the axial direction of the pair of shafts.

3. The webbing winding device according to claim 1, wherein the base end connecting portion has a middle portion in the direction connecting the base end portions of the pair of side portions set to be thinner than the other portions.

4. The webbing winding device according to claim 1, wherein two elongated vertical connecting portions are formed between the pair of side portions, on both sides of the central position in the spacing direction, connecting the tip-side connecting portion and the base-side connecting portion, and the distance between the two vertical connecting portions is set to be smaller than the width of the webbing.

5. The webbing winding device according to claim 1, wherein the end face of the tip connecting portion, which is positioned on the winding shaft side of the through portion, has an inclined portion that slopes toward the through portion side toward the side adjacent to the webbing.

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