JP2024165061A - Anchor plate and anchor device - Google Patents

Abstract

To provide an anchor plate which can reduce an influence on a use period of a seat belt webbing.SOLUTION: An anchor plate 3 has: a base plate including a plate body 10 and a resin plate 30 overlapping a top surface 10f of the plate body 10; and a spring plate 20 mounted on the base plate. The plate body 10 is formed into a flat plate shape, and has a large width part 15a which is an opening for inserting a seat belt webbing 103 thereinto. The resin plate 30 has: a webbing insertion part 35w which covers an edge part of the large width part 15a and inserts the seat belt webbing 103 thereinto; and a projection part 39 which is provided in a part in at least a width direction of the seat belt webbing 103 in the edge part of the webbing insertion part 35w, projects in a direction separated from a main surface of the plate body 10, and whose surface is formed into a curved surface shape in an extension direction of the seat belt webbing 103.SELECTED DRAWING: Figure 10

Description

This disclosure relates to anchor plates and anchor devices.

Patent document 1 describes an anchor device that connects a seat belt webbing to an automobile body. This anchor device includes an anchor plate, an opening in the anchor plate, and a stopper made of a spring plate riveted to the plate body. The head of a bolt fixed to the vehicle body is inserted into the opening, and the edge of the opening is clamped between the flange and head of the bolt. A locking piece provided on the stopper engages with the bolt head, preventing the bolt head from moving back, and maintaining the edge clamped by the bolt head and flange.

JP 2019-202561 A

In conventional anchor devices such as those described in Patent Document 1, the seat belt webbing is inserted and fixed into an opening in the anchor plate, but because the anchor plate is flat, the contact area between the seat belt webbing and the opening is small. For this reason, when an occupant puts on the seat belt webbing, for example, the occupant pulls on the seat belt webbing and an external force is applied through the seat belt webbing, which tends to increase the load on the contact portion of the seat belt webbing. This may cause wear on the seat belt webbing, which may affect its service life.

The present disclosure aims to provide an anchor plate and an anchor device that can reduce the impact on the usage period of seat belt webbing.

The anchor plate according to one aspect of the embodiment of the present invention is an anchor plate connected and fixed to a stopper attached to a vehicle body or a seat, and includes a base plate having an opening into which the stopper is inserted at the base end and through which the seat belt webbing is inserted at the tip end, and a spring plate attached to the base plate. The base plate includes a first plate and a second plate made of resin that overlaps one surface of the first plate. The first plate is formed in a flat shape and has a first insertion hole through which the seat belt webbing is inserted. The second plate has a second insertion hole that covers an edge of the first insertion hole and through which the seat belt webbing is inserted, and a convex portion that is provided on at least a portion of the edge of the second insertion hole along the width direction of the seat belt webbing, protrudes in a direction away from the main surface of the first plate, and has a surface that is curved along the extension direction of the seat belt webbing.

Similarly, an anchor device according to one aspect of an embodiment of the present invention comprises the above-mentioned anchor plate and a locking body that is attached to the vehicle body or the seat and connects and fixes the anchor plate.

The present disclosure provides an anchor plate and an anchor device that can reduce the impact on the usage period of the seat belt webbing.

FIG. 1 is a perspective view of an anchor device according to an embodiment; FIG. 1 is a perspective view of an anchor device in the middle of engagement between an anchor plate and a bolt; FIG. 1 is a perspective view of an anchor device in which an anchor plate and a bolt are engaged with each other; An exploded perspective view of an anchor plate Top view of the resin plate Plan view of spring plate FIG. 2 is a longitudinal sectional view of the anchor plate in FIG. FIG. 1 is a longitudinal sectional view of an anchor device in the middle of engagement between the anchor plate and the bolt; FIG. 1 is a longitudinal sectional view of an anchor device in which an anchor plate and a bolt are engaged with each other; FIG. 1 is a schematic diagram showing an example of a state in which an anchor device is installed on a vehicle body; FIG. 13 is a diagram showing a convex portion according to a first modified example. FIG. 13 is a diagram showing a convex portion according to a second modified example. FIG. 13 is a diagram showing a convex portion according to a third modified example.

The following describes the embodiments with reference to the attached drawings. To facilitate understanding of the description, the same components in each drawing are denoted by the same reference numerals as much as possible, and duplicate descriptions are omitted.

In the following description, the X, Y, and Z directions are perpendicular to each other. The X direction is the longitudinal direction of the anchor plate 3, and is the sliding direction when the anchor plate 3 engages with the bolt 2. The Y direction is the transverse direction of the anchor plate 3. The Z direction is the opposing direction between the anchor plate 3 and the bolt 2, and is the axial direction of the bolt 2 when the anchor plate 3 is engaged with the bolt 2. In the following description, the positive Z direction may be referred to as the "upper side" and the negative Z direction as the "lower side."

Figure 1 is a perspective view of an anchor device 1 according to an embodiment. Figure 2 is a perspective view of the anchor device 1 in the middle of engagement between the anchor plate 3 and the bolt 2. Figure 3 is a perspective view of the anchor device 1 in a state in which the anchor plate 3 and the bolt 2 are engaged. Figure 4 is an exploded perspective view of the anchor plate 3. Figure 5 is a plan view of the resin plate 30. Figure 6 is a plan view of the spring plate 20. Figure 7 is a vertical cross-sectional view of the anchor plate 3 in Figure 1.

The anchor device 1 according to this embodiment is a device that connects the seat belt webbing 103 to the vehicle body by connecting the loop portion 103A (see FIG. 10) at one end of the seat belt webbing 103 and fixing it to a bolt 2 fixed to the vehicle body or the seat.

As shown in FIG. 1, the anchor device 1 has a bolt 2 as a fastening body that is attached to the body of the automobile, and an anchor plate 3 that is fastened to the bolt 2. The seat belt webbing 103 (see FIG. 10) is passed through the anchor plate 3.

The bolt 2 has a bolt shank 2a, a bolt head 2b at the tip of the bolt shank 2a, a flange 2c provided midway along the bolt shank 2a, and a groove 2d formed between the bolt head 2b and the flange 2c. Although not shown in the figure, a male thread is provided on the outer peripheral surface of the bolt shank 2a, which is closer to the rear end than the flange 2c. The groove 2d goes around the periphery of the bolt head 2b. The symbol 2r indicates the back surface of the bolt head 2b.

The anchor plate 3 has a plate body (first plate) 10, a resin plate (second plate) 30, and a spring plate 20 attached to the plate body 10. The plate body 10 is made of a metal plate having an upper surface 10f as shown in FIG. 4. The length of the plate body 10 in the front-rear direction from the tip 10T to the base end (rear end) 10E is greater than the width in the direction perpendicular to the length. In this embodiment, the plate body 10 and the resin plate 30 form a base plate.

As shown in FIG. 4, an opening 15 is provided in the plate body 10. The opening 15 extends in the longitudinal direction of the plate body 10, with a large width portion 15a on the tip end 10T side and a small width portion 15b on the base end 10E side.

The large width portion 15a is wide enough for the bolt head 2b to pass through. The portion where the large width portion 15a and the small width portion 15b join is gradually narrower in width from side to side toward the small width portion 15b. The width of the small width portion 15b is smaller than the diameter of the bolt head 2b and the flange 2c, and slightly larger than the bolt diameter at the groove portion 2d.

The plate body 10 has a pair of long sides 11, 12 surrounding the opening 15, and a pair of short sides 13, 14. Rivet holes 16, 17 are provided midway along the longitudinal direction of the long sides 11, 12.

As shown in Figures 4, 5, and 7, the resin plate 30 is arranged so as to overlap one surface (upper surface 10f) of the plate body 10. The outer shape of the resin plate 30 is the same as or slightly smaller than the outer shape of the plate body 10.

The resin plate 30 has a pair of long sides 31, 32 that overlap the long sides 11, 12 of the plate body 10, a pair of short sides 33, 34 that overlap the short sides 13, 14, an opening 35 surrounded by the long sides 31, 32 and the short sides 33, 34, and rivet holes 36, 37 provided midway along the length of the long sides 31, 32.

As shown in Figures 4 and 7, a hook piece 38 with an L-shaped cross section is provided on the short side 33 on the tip 30T side of the resin plate 30. There is a gap between this hook piece 38 and the short side 33 that is approximately the same as the thickness of the plate body 10.

The lower surfaces of the long side portions 31, 32 on the base end 30E side are inclined surfaces that move away from the upper surface 10f of the plate body 10 as they approach the base end 30E side, and the legs 21, 22 of the spring plate 20 shown in Figures 4 and 6 are arranged along these inclined surfaces.

As shown in Figures 4 and 5, near portions 41, 42 that protrude from the inner periphery of the opening 35 toward the tip 30T from the longitudinal midpoint of the long side portions 31, 32 are provided. The distance between the narrowest portions of the near portions 41, 42 is smaller than the diameter of the bolt head 2b. The opening 35 has a webbing insertion portion 35w (second insertion hole) on the tip 30T side from the near portions 41, 42.

On the base end 30E side of the approaching portions 41, 42, protruding pieces 51, 52 are provided from the inner peripheral edge of the opening 35.

The protruding pieces 51, 52 extend in the longitudinal direction of the opening 35. The distance between the protruding pieces 51, 52 is approximately the same as the distance between the narrow portions 15b, is smaller than the diameter of the head 2b and flange 2c of the bolt 2, and is slightly larger than the diameter of the bolt groove 2d.

The area between the protruding pieces 51, 52 is the small hole 35b. The area between the protruding pieces 51, 52 and the adjacent parts 41, 42 is the large hole 35a.

The upper surfaces (surfaces opposite the plate body 10) of the overhanging pieces 51, 52 are provided with slopes 51a, 52a that slope downward toward the approaching parts 41, 42. The back surface 2r of the bolt head 2b shown in FIG. 1 can move along these slopes 51a, 52a and ride up onto the upper surfaces of the overhanging pieces 51, 52. The overhanging pieces 51, 52 are provided at positions and sizes that overlap the edges of the narrow parts 15b of the openings 15 of the long sides 11, 12 of the plate body 10. Note that while only the overhanging piece 51 is shown in FIG. 7, the positional relationship of the overhanging piece 52 is similar.

As shown in Figs. 5 and 7, the resin plate 30 has a small piece 53 that protrudes from the short side 34 on the base end 30E side into the opening 35. The small piece 53 is located between the elastic pieces 61 and 62 described below. As shown in Fig. 7, the small piece 53 is located at a position and size that overlaps with the edge of the opening 15 on the base end 10E side of the plate body 10.

As shown in FIG. 7, the top surface of the small piece portion 53 is flush with the top surfaces of the protruding pieces 51 and 52 (excluding the slope portions 51a and 52a). As a result, when the bolt 2 is engaged with the anchor plate 3 as described below, the back surface 2r of the bolt head 2b rides up on the protruding pieces 51 and 52 and the small piece portion 53.

Elastic pieces (resin elastic pieces) 61, 62 against which the bolt head 2b abuts are provided near the short side portion 34 on the base end 30E side of the resin plate 30. The elastic pieces 61, 62 extend from the inner peripheral edges near the base end 30E of the long side portions 31, 32 in directions approaching each other and approaching the short side portion 34.

The elastic pieces 61, 62 are provided symmetrically on both sides of the center of the width of the opening 15. The extending ends of the elastic pieces 61, 62 are spaced apart from the short side portion 34.

Retaining pieces 71, 72 protrude from the base end 30E of the long sides 31, 32 in the extension direction of each long side 31, 32.

As shown in Figures 4 and 6, the spring plate 20 has legs 21, 22 whose tip ends 20T are attached to the long sides 11, 12 of the plate body 10, a tie portion 23 that connects the base ends 20E of the legs 21, 22, a tongue portion 25 that extends from the tie portion 23 to the vicinity of the approach portions 41, 42, and a stopper piece 26 that is cut and raised from the tongue portion 25.

The legs 21 and 22 have rivet holes 21a and 22a on the tip 20T side. The rivet holes 21a and 22a are coaxial with the rivet holes 16 and 17 of the plate body 10, and the spring plate 20 is fixed to the plate body 10 by driving rivets 81 and 82. The legs 21 and 22 are farther away from the plate body 10 toward the base end 20E.

The base end 20E side of the legs 21 and 22 is curved into a substantially U-shape to form U-shaped portions 21u and 22u.

Both ends of the tie portion 23 of the spring plate 20 are connected to the end portions 21b, 22b of each U-shaped portion 21u, 22u. Each end portion 21b, 22b and the tie portion 23 are planar so as to overlap the upper surface of the plate body 10.

The base end of the tongue portion 25 is a U-shaped curved portion 25r that connects to the tie portion 23.

The tongue portion 25 extends from the curved portion 25r in a direction substantially parallel to the upper surface 10f of the plate body 10. The tip of the tongue portion 25 in the extending direction reaches the large hole portion 35a of the resin plate 30.

The tip of the tongue portion 25 is bent into a generally U-shape to form a bent portion 25b. The bent portion 25b is disposed between the adjacent portions 41, 42 of the resin plate 30.

As shown in FIG. 7, the plate surface of the tang portion 25 and the upper surface 10f of the plate body 10 are spaced apart by the thickness of the bolt head 2b (see also FIG. 9).

The stopper piece 26 is formed by cutting and raising from the tongue portion 25. The stopper piece 26 is connected to the tip 20T side of the tongue portion 25 and is shaped like a tongue that extends toward the base end 20E side. The stopper piece 26 is inclined so that it approaches the plate body 10 from the plate surface of the tongue portion 25 as it approaches the base end 20E side.

To assemble this anchor plate 3, first, the spring plate 20 and the resin plate 30 are assembled. At this time, the legs 21, 22 engage with the undersides of the base ends 30E of the long sides 31, 32, and the rivet holes 21a, 22a are coaxial with the rivet work holes 36, 37.

The tie portion 23 is disposed below the short side portion 34. The curved portion 25r of the tongue portion 25 surrounds the short side portion 34. The tongue portion 25 passes above the narrow hole portion 35b and extends to the large hole portion 35a, and the curved portion 25b is disposed between the adjacent portions 41 and 42.

After assembling the spring plate 20 and the resin plate 30 in this manner, as shown in FIG. 7, the L-shaped hook piece 38 of the resin plate 30 is inserted through the opening 15 into the underside of the short side 13 of the plate body 10. This causes the short side 13 of the plate body 10 to be clamped between the hook piece 38 and the short side 33. The base end 20E side of the spring plate 20 and the resin plate 30 are then placed on the upper surface 10f of the plate body 10. Next, rivets 81 and 82 are driven through the rivet work holes 36 and 37 into the rivet holes 21a and 22a and the rivet holes 16 and 17 to connect and fix the spring plate 20 and the resin plate 30 to the plate body 10.

In this way, the spring plate 20 and the resin plate 30 are fixed to the plate body 10 to form the anchor plate 3.

At this time, the anchor plate 3 includes a base plate having an opening into which a bolt 2 attached to the vehicle body or the seat is inserted at the base end and through which the seat belt webbing 103 is inserted at the tip end, and a spring plate 20 attached to the base plate. The base plate includes a plate body 10 and a resin plate 30 that overlaps the upper surface 10f of the plate body 10. In other words, the "base plate opening" is formed by overlapping the opening 15 of the plate body 10 and the opening 35 of the resin plate 30 in the Z direction.

Next, the procedure for engaging the anchor plate 3 with the bolt 2 will be described with reference to Figs. 1 to 3, 7, and also Figs. 8 and 9. Fig. 8 is a vertical cross-sectional view of the anchor device 1 in the middle of engaging the anchor plate 3 with the bolt 2, and corresponds to the state shown in Fig. 2. Fig. 9 is a vertical cross-sectional view of the anchor device 1 in the state where the anchor plate 3 and the bolt 2 are engaged, and corresponds to the state shown in Fig. 3. Fig. 7 is a vertical cross-sectional view of the anchor plate 3 after assembly, and corresponds to the state shown in Fig. 1.

In this embodiment, the anchor plate 3 and the bolt 2 are engaged in the procedure shown in Figures 1, 2, and 3.

The bolt 2 is fixed to the vehicle body or the seat by screwing the bolt shaft 2a into a female thread member (not shown) of the vehicle body or the seat. In this embodiment, it is fixed to a fixing member 101 (see FIG. 10) of the vehicle body. In addition, the seat belt webbing 103 (see FIG. 10) is inserted in advance into the webbing insertion portion 35w (the tip side of the approaching portions 41, 42) of the anchor plate 3.

First, as shown by arrow A in Fig. 1, the anchor plate 3 is brought close to the bolt 2 from the positive Z direction, and the large hole portion 35a of the opening 35 is fitted onto the bolt head 2b. The anchor plate 3 is then pushed further into the negative Z direction as shown by arrow A in Figs. 1 and 8, which presses the tongue portion 25 through the stopper piece 26 of the spring plate 20 that contacts the bolt head 2b, and as shown by arrow B in Figs. 2 and 8, the tongue portion 25 and the stopper piece 26 elastically deform around the curved portion 25r on the base end 20E side, and are pushed upward.

Next, as shown by arrow C in Figures 2 and 8, the anchor plate 3 is moved in a direction (X-positive direction) in which the base ends 10E, 20E, and 30E approach the bolt 2. Then, the bolt 2 moves from the large hole portion 35a to the small hole portion 35b, and the back surface 2r of the bolt head 2b slides along the slope portions 51a and 52a of the protruding pieces 51 and 52 of the resin plate 30 shown in Figure 7, and the flange 2c slides along the back surface of the plate body 10.

During this movement, the upper surface of the bolt head 2b first comes into contact with the lower surface of the stopper piece 26. When the anchor plate 3 is moved further, the bolt head 2b enters between the stopper piece 26 and the protruding pieces 51, 52, as shown in Figure 8. When the anchor plate 3 is moved further in the direction of arrow C, the bolt head 2b passes through the stopper piece 26, moves beyond the slope parts 51a, 52a of the protruding pieces 51, 52 to the base end 20E side, and is elastically pressed against the elastic pieces 61, 62, as shown in Figures 3 and 9. The back surface 2r of the bolt head 2b also rides up onto the small piece part 53.

In this state, the stopper piece 26 is located closer to the large hole portion 35a than the bolt head 2b, and as shown by arrow D in Figures 3 and 9, the tang portion 25 and the stopper piece 26 elastically return downward around the curved portion 25r, returning to the initial position shown in Figure 1. This causes the tip of the stopper piece 26 to move below the top surface of the bolt head 2b and engage with the side surface of the bolt head 2b. As a result, the bolt head 2b is prevented from moving backward toward the large hole portion 35a, and the anchor plate 3 is connected to the bolt 2 so that it cannot be removed.

In addition, the bolt head 2b receives an elastic reaction force from the elastic pieces 61 and 62 and is pressed against the tip of the stopper piece 26, preventing the anchor plate 3 from moving in the longitudinal direction.

As shown in FIG. 9, the bolt head 2b and the flange 2c clamp the protruding pieces 51, 52 and small piece 53 of the resin plate 30 and the edge of the base end 10E of the opening 15 of the plate body 10.

This anchor plate 3 has a plate body 10 with one opening 15, so it is easy to manufacture and the overall length of the plate body 10 can be made small. In addition, the legs 21, 22 and tongue 25 of the spring plate 20 are also shaped like a flat plate overall, making it easy to manufacture.

In this anchor plate 3, the openings 15, 35 are partitioned by the approaching sections 41, 42 to define the webbing insertion section 35w, so that when the anchor plate 3 is engaged with the bolt 2, the seat belt webbing 103 does not enter the large hole section 35a, and this engagement operation can be performed easily.

In this anchor plate 3, the bolt head 2b and flange 2c clamp the protruding pieces 51, 52 and small piece 53 of the resin plate 30 and the edge of the opening 15 of the plate body 10. This prevents the anchor plate 3 from moving in the axial direction of the bolt 2. In addition, the reaction force from the elastic pieces 61, 62 presses the side of the bolt head 2b against the tip of the stopper piece 26. This prevents the anchor plate 3 from moving in the plate surface direction (longitudinal direction), preventing vibration and abnormal noise.

In particular, in this embodiment, the spring plate 20 is formed so that at least a portion of it protrudes beyond the surface (the surface facing upward) of the resin plate 30 before and after the anchor plate 3 is connected and fixed to the bolt 2.

Specifically, in this embodiment, the protrusion 27 is provided at approximately the center of the upper surface of the tongue portion 25 of the spring plate 20. The protrusion 27 is approximately circular in plan view, as shown in FIG. 1, for example, and is formed to protrude upward from the upper surface of the tongue portion 25. In this embodiment, the surface of the protrusion 27 is formed in a curved shape such that the center portion in plan view protrudes the most upward and is convex outward. Furthermore, as shown in FIG. 7, for example, the protrusion 27 is formed so that at least the top portion is located at the uppermost position on the spring plate 20. Note that, although FIG. 1 shows an example of a configuration in which one protrusion 27 is provided, a configuration in which multiple protrusions are provided may also be used.

By providing the protrusion 27 on the tongue portion 25, in the anchor plate 3 during assembly as shown in FIG. 7, before the anchor plate 3 is connected and fixed to the bolt 2, the height H from the upper surface 10f of the plate body 10 to the top of the spring plate 20, i.e., the protrusion 27, can be set higher than the height h from the upper surface 10f of the plate body 10 to the upper surface of the resin plate 30. Similarly, even in the state after the anchor plate 3 is connected and fixed to the bolt 2 as shown in FIG. 9, the height H from the upper surface 10f of the plate body 10 to the top of the spring plate 20, i.e., the protrusion 27, can be set higher than the height h from the upper surface 10f of the plate body 10 to the upper surface of the resin plate 30. Also, as shown in Figure 8, when the anchor plate 3 is in the process of being connected and fixed to the bolt 2, the tongue portion 25 of the spring plate 20 is pushed upward, so naturally the height H' from the top surface 10f of the plate body 10 to the top of the spring plate 20, i.e., in the case of Figure 8, the tip of the tongue portion 25 on the positive X-direction side, can be set higher than the height h from the top surface 10f of the plate body 10 to the top surface of the resin plate 30. In other words, the relationship is H>h and H'>h as shown in Figures 7 to 9.

As described above, this embodiment satisfies the requirement that at least a portion of the tongue portion 25 of the spring plate 20 protrudes from the surface of the resin plate 30 before and after the anchor plate 3 is connected and fixed to the bolt 2. Specifically, the protrusion 27 is formed so that the height H from the top surface 10f of the plate body 10 to the top of the protrusion 27 is higher than the height h from the top surface 10f of the plate body 10 to the part of the resin plate 30 that is furthest above the top surface 10f, thereby satisfying the above requirement.

The effect of satisfying the above requirements will be described with reference to Figure 10. Figure 10 is a schematic diagram showing an example of a state in which an anchor device 1 according to an embodiment is installed on a vehicle body. In the example of Figure 10, the bolt 2 is installed on a fixing member 101 on the vehicle body side, such as a pillar. The anchor plate 3 is installed so that its upper surface faces a seat exterior material 102, such as a side cover of a seat inside the vehicle cabin.

As described above, the protrusion 27 is formed to protrude upward from the tongue portion 25 of the spring plate 20. Therefore, the top of the protrusion 27 is positioned closer to the surface of the exterior material 102 than the upper surface of the tongue portion 25. In other words, as shown in FIG. 10, the distance D1 between the protrusion 27 and the exterior material 102 is smaller than the distance D2 between the tongue portion 25 and the exterior material 102 (D1>D2).

The seat belt webbing 103 is inserted through the webbing insertion portion 35w of the anchor plate 3 and connected to the anchor plate 3. After one end of the seat belt webbing 103 is inserted through the webbing insertion portion 35w, it is joined to the seat belt webbing 103 to form a loop portion 103A. This loop portion 103A surrounds the short side portion 33 and the hook piece portion 38 of the resin plate 30 of the anchor plate 3 and the short side portion 13 of the plate body 10 around the Y axis. The seat belt webbing 103 is connected to the anchor plate 3 via this loop portion 103A.

When an occupant puts on the seat belt webbing 103, for example, the occupant pulls on the seat belt webbing, and an external force F is applied to the other end of the seat belt webbing 103. This external force F is transmitted to the anchor plate 3 via the loop portion 103A. This external force F may cause the anchor plate 3 to twist around the X axis with respect to the axial direction (Z direction) of the bolt 2, or to tilt in the positive X direction and the negative Z direction (to the lower right in FIG. 10). If such a situation occurs, the tongue portion 25 of the spring plate 20 may elastically deform upward relative to the bolt 2 around the curved portion 25r, which may affect the engagement between the stopper piece 26 and the side of the bolt head 2b of the bolt 2.

In response to this problem, the anchor plate 3 and anchor device 1 according to this embodiment provide the protrusion 27 on the spring plate 20 as described above, and by satisfying the above-mentioned requirements, the distance between the spring plate 20 and the seat exterior material 102 can be shortened. Therefore, even if an external force F is applied to the anchor plate 3 via the seat belt webbing 103, the protrusion 27 can be caused to come into contact with the exterior material 102 first, thereby suppressing the amount of upward elastic deformation of the tongue portion 25 of the spring plate 20. This suppresses the effect on the engagement between the anchor plate 3 and the bolt 2.

Note that while FIG. 10 illustrates an example of a configuration in which the anchor device 1 according to this embodiment is installed on the vehicle body, the anchor device 1 may also be installed on the seat side. In this case, the bolt 2 is installed, for example, on the side of the seat. The anchor plate 3 is installed so that its upper surface faces a surface of the vehicle body facing the passenger compartment, such as a pillar. In other words, the positional relationship between the element 101 on the vehicle body side and the element 102 on the seat side shown in FIG. 10 is reversed with respect to the anchor device 1.

Therefore, even in the case where the anchor device 1 is installed on the seat side, the same effect as that described with reference to FIG. 10 can be achieved. In other words, by providing the protrusion 27 on the spring plate 20, the distance between the spring plate 20 and the surface of the vehicle body side element 101 on the passenger compartment side can be shortened. Therefore, even if a situation occurs in which the anchor plate 3 is pried off, the protrusion 27 can make the spring plate 20 come into contact with the vehicle body side element 101 first, so the amount of elastic deformation of the tongue portion 25 of the spring plate 20 toward the vehicle body side can be suppressed. This suppresses the effect on the engagement between the anchor plate 3 and the bolt 2.

As shown in FIG. 4 and other figures, the plate body 10 is a metal plate formed in a flat plate shape. The plate body 10 has a seat belt webbing 103 inserted through the wide portion 15a (first insertion hole) on the tip 10T side of the opening 15. As shown in FIG. 4 and FIG. 7, a gap approximately equal to the thickness of the plate body 10 is provided between the short side portion 33 on the tip 30T side of the resin plate 30 and the hook piece portion 38 having an L-shaped cross section, and the short side portion 13 on the tip 10T side of the plate body 10 is fitted into this gap. As a result, the short side portion 13 of the plate body 10 is sandwiched between the hook piece portion 38 and the short side portion 33, and a webbing insertion portion 35w (second insertion hole) is formed that covers the edge of the wide portion 15a of the plate body 10 and inserts the seat belt webbing 103.

In particular, in this embodiment, a convex portion 39 is provided on the edge of the webbing insertion portion 35w (second insertion hole). The convex portion 39 is provided on at least a portion (portion on the positive X side) of the edge along the width direction (Y direction) of the seat belt webbing 103, protrudes in a direction away from the upper surface 10f of the plate body 10 (positive Z direction in this embodiment), and has a curved surface formed along the extension direction of the seat belt webbing 103.

By providing the convex portion 39 in this manner, when the seat belt webbing 103 is pulled from the other end side by an external force F as shown in FIG. 10, the portion of the loop portion 103A that comes into contact with the edge of the webbing insertion portion 35w can come into contact with the convex portion 39. This increases the contact area between the loop portion 103A and the edge of the webbing insertion portion 35w, and distributes the load applied to the contact portion of the seat belt webbing 103. This reduces wear on the seat belt webbing 103 and reduces any effects on the service life.

In addition, since the convex portion 39 is formed on the resin plate 30, there is no need to perform burring on the short side portion 13 of the metal plate body 10 covered by the resin plate 30 to correspond to the shape of the convex portion 39, and the short side portion 13 can remain flat. This improves the ease of manufacturing the plate body 10 and also improves the degree of freedom in the shape of the convex portion 39.

Next, a modified example of the convex portion 39 according to this embodiment will be described with reference to Figures 11 to 13.

Figure 11 shows the convex portions 39A and 39B according to the first modified example. Figure 11 corresponds to an enlarged view of the vicinity of the webbing insertion portion 35w, the hook piece portion 38, and the short side portion 33 in Figure 10.

As shown in FIG. 11(A), the convex portions 39A and 39B may be provided on both sides of a pair of main surfaces of the plate body 10. In FIG. 11(A), the first convex portion 39A is provided in a direction moving upward from the upper surface 10f of the plate body 10, and the second convex portion 39B is provided in a direction moving downward from the lower surface opposite the upper surface 10f. That is, in the example of FIG. 11, two convex portions 39A and 39B protruding on both sides in the Z direction are provided at the edge of the webbing insertion portion 35w. The shape of each of the convex portions 39A and 39B is formed in a curved shape along the extension direction of the seat belt webbing 103, similar to the convex portion 39 in the above embodiment.

As in the example of FIG. 11, if the convex portions 39A and 39B are provided on both sides in the Z direction of the edge of the webbing insertion portion 35w, the contact area between the loop portion 103A and the edge of the webbing insertion portion 35w can be further increased compared to the configuration of the above embodiment, and the load applied to the contact portion of the seat belt webbing 103 can be further distributed. This is more advantageous in achieving the effect of suppressing the influence on the usage period of the seat belt webbing 103.

In addition, in the configuration of FIG. 11, in both cases where the seat belt webbing 103 is pulled toward one of the convex portions 39A and the other convex portion 39B, the load from the seat belt webbing 103 can be received primarily by one of the pair of convex portions 39A and 39B. As a result, regardless of the difference between the longitudinal direction of the anchor plate 3 and the pulling direction of the seat belt webbing 103, the load applied to the contact portion of the seat belt webbing 103 can always be distributed with the same structure shown in FIG. 11. This improves the versatility of the anchor plate 3 and the anchor device 1.

Also, as shown in FIG. 11(B), a configuration may be used in which the convex portion 39A shown in FIG. 11(A) is not provided, and only the convex portion 39B is provided in a direction away from the lower surface of the plate body 10. In short, a configuration may be used in which the convex portion 39 is provided on one side of a pair of main surfaces of the plate body 10, such as a configuration having the convex portion 39 shown in FIG. 10 or a configuration having the convex portion 39B shown in FIG. 11(B).

11B, in the case of an installation structure in which the seat belt webbing 103 is pulled on the side where the convex portion 39B is provided, i.e., in the direction of the X positive direction and the Z negative direction, and an external force F is applied in this direction, the convex portion 39B can mainly receive the load from the seat belt webbing 103. On the other hand, in the case of an installation structure in which the seat belt webbing 103 is pulled on the side where the convex portion 39 is provided, i.e., in the direction of the X positive direction and the Z positive direction, and an external force F is applied in this direction, the convex portion 39 can mainly receive the load from the seat belt webbing 103. In this way, in the case of a configuration in which the convex portion is provided on one side of the pair of main surfaces of the plate body 10, it is sufficient to use either the configuration having the convex portion 39 shown in FIG. 10 or the configuration having the convex portion 39B shown in FIG. 11B depending on the pulling direction of the seat belt webbing 103 relative to the longitudinal direction of the anchor plate 3 (the X direction in FIGS. 10 and 11).

Figure 12 shows the convex portions 39C and 39E according to the second modified example. Figure 12 also corresponds to an enlarged view of the vicinity of the webbing insertion portion 35w, the hook piece portion 38, and the short side portion 33 in Figure 10.

As shown in FIG. 12, the protruding direction of the convex portions 39C and 39E does not necessarily have to be the normal direction of the pair of main surfaces of the plate body 10, and may be inclined with respect to the direction of the main surfaces. In this case, it is preferable that the inclination direction is inclined in the direction of the external force F applied from the seat belt webbing 103.

For example, as shown in FIG. 12A, in the case of an installation structure in which the seat belt webbing 103 is pulled in the X-positive direction and the Z-positive direction and an external force F is applied in this direction, the convex portion 39C is provided so as to protrude in a direction E that is inclined from the Z-positive direction toward the X-positive direction. This configuration makes it possible to more uniformly distribute the load from the seat belt webbing 103 on each portion of the convex portion 39C.

Furthermore, when providing the convex portion 39C as shown in FIG. 12(A), it is preferable that the portion 39D of the inner peripheral surface of the webbing insertion portion 35w where the convex portion 39C is provided is also formed at an incline with respect to the Z direction so as to extend along the protruding direction E of the convex portion 39C. In this case, as shown in FIG. 12(A), the convex portion 39C and the inner peripheral surface 39D of the webbing insertion portion 35w are formed flush with each other, and both are formed at an incline along the inclination direction E. This configuration makes it possible to more uniformly distribute the load from the seat belt webbing 103 on each portion of the convex portion 39C and the inner peripheral surface 39D.

On the other hand, for example, as shown in FIG. 12(B), in the case of an installation structure in which the seat belt webbing 103 is pulled in the X positive direction and the Z negative direction and an external force F is applied in this direction, the convex portion 39E is provided so as to protrude in a direction G that is inclined from the Z negative direction toward the X positive direction. This configuration makes it possible to make the load from the seat belt webbing 103 applied to each part of the convex portion 39E more uniform.

Furthermore, when providing a convex portion 39E as shown in FIG. 12(B), it is preferable that a portion 39F of the inner peripheral surface of the webbing insertion portion 35w where the convex portion 39E is provided is also formed at an incline with respect to the Z direction so as to extend along the protruding direction G of the convex portion 39E. In this case, as shown in FIG. 12(B), the convex portion 39E and the inner peripheral surface 39F of the webbing insertion portion 35w are formed flush with each other, and are both formed at an incline along the inclination direction G. This configuration makes it possible to more uniformly distribute the load from the seat belt webbing 103 on each portion of the convex portion 39E and the inner peripheral surface 39F.

Figure 13 shows the convex portions 39G and 39H of the third modified example. Figure 13 corresponds to the longitudinal cross-sectional view of the anchor device 1 shown in Figure 10.

As shown in FIG. 13, it is preferable that the convex portions 39G and 39H are provided on at least one of the pair of main surfaces of the plate body 10 that is subject to a large tensile force F from the seat belt webbing 103.

For example, as shown in FIG. 13(A), consider a case where the seat belt webbing 103 is pulled in a direction perpendicular to the longitudinal direction (X direction) of the anchor plate 3 (Z positive direction in the example of FIG. 13(A)). In this case, the tensile force F applied by the seat belt webbing 103 is on the Z positive direction side, so that among the edges of the webbing insertion portion 35w, the underside of the lower hook piece portion 38 receives the greatest tensile force F from the loop portion 103A of the seat belt webbing 103.

Therefore, in the case of the positional relationship between the longitudinal direction of the anchor plate 3 and the pulling direction of the seat belt webbing 103 shown in FIG. 13(A), it is preferable to provide the convex portion 39G on the hook piece portion 38 so that it protrudes in the negative Z direction. This allows the thickness of the resin plate 30 to be increased in the portion that receives the greatest tensile force F from the seat belt webbing 103, thereby improving the durability of the anchor plate 3 against the tensile force F.

As shown in FIG. 13(B), consider a case where the anchor plate 3 is installed at an angle to the vertical direction (the Z positive direction side is the vertically upward direction in FIG. 13(B)). In this case, the seat belt webbing 103 is pulled vertically upward.

When the anchor plate 3 is installed at an angle in this manner, it is preferable that the convex portion 30H is provided at least on the side of the pair of main surfaces of the plate body 10 that faces upward. In this case, the upper short side portion 33 of the edge of the webbing insertion portion 35w receives the greatest tensile force F from the loop portion 103A of the seat belt webbing 103. Therefore, as shown in FIG. 13(B), the convex portion 39H is provided at least on the side of the pair of main surfaces of the plate body 10 that faces upward, i.e., the short side portion 33 on the top surface 10f side.

The configuration shown in FIG. 13(B) allows the thickness of the resin plate 30 to be increased at the portion that receives the greatest tensile force F from the seat belt webbing 103, thereby improving the durability of the anchor plate 3 against the tensile force F.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Design modifications to these specific examples made by a person skilled in the art are also included within the scope of the present disclosure as long as they have the features of the present disclosure. The elements of each of the above-mentioned specific examples, as well as their arrangement, conditions, shape, etc., are not limited to those exemplified and can be modified as appropriate. The elements of each of the above-mentioned specific examples can be combined in different ways as appropriate, as long as no technical contradictions arise.

1 Anchor device 2 Bolt (retaining body)
3 Anchor plate 10 Plate body (first plate)
20D Spring plate 30 Resin plate (second plate)
103 Seat belt webbing 15a Large width portion of opening of plate body (first insertion hole)
35w Webbing insertion part (second insertion hole)
39, 39A, 39B, 39C, 39E, 39G, 39H Convex portion

Claims (6)

An anchor plate that is connected and fixed to a fastener that is attached to a vehicle body or a seat,
a base plate having an opening through which the engaging body is inserted at a base end side and through which the seat belt webbing is inserted at a tip end side;
a spring plate attached to the base plate;
Equipped with
the base plate includes a first plate and a second plate made of resin and overlapping one surface of the first plate;
The first plate is formed in a flat plate shape and has a first insertion hole through which the seat belt webbing is inserted,
The second plate is
a second insertion hole that covers an edge portion of the first insertion hole and through which the seat belt webbing is inserted;
a convex portion provided on at least a portion of an edge of the second insertion hole along a width direction of the seat belt webbing, protruding in a direction away from the main surface of the first plate, and having a surface formed in a curved shape along the extending direction of the seat belt webbing;
Anchor plate. The convex portion is provided on one side of a pair of main surfaces of the first plate.
The anchor plate according to claim 1 . The convex portions are provided on both sides of a pair of main surfaces of the first plate.
The anchor plate according to claim 1 . The convex portion is provided on at least one of the pair of main surfaces of the first plate that is largely subjected to a tensile force from the seat belt webbing.
The anchor plate according to claim 1 . The convex portion is provided on at least one of the pair of main surfaces of the first plate facing upward when the anchor plate is installed at an angle.
The anchor plate according to claim 1 . An anchor plate according to any one of claims 1 to 5;
A locking body that is attached to a vehicle body or a seat and connects and fixes the anchor plate;
An anchor device comprising:

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