JP7088448B2 - Buckle device - Google Patents

Description

The present invention relates to a buckle device in which a limiting member limits the movement of the tongue to one side and the webbing is mounted on the occupant.

In the buckle device described in Patent Document 1 below, a pair of support pieces of a lock plate are supported by a pair of support holes of the buckle body so that the lock plate can be rotated, and the lock plate is engaged with the tongue of the webbing. The engagement of the pieces limits the movement of the lock plate to one side of the tongue and the webbing is attached to the occupant.

By the way, in such a buckle device, it is preferable that when a load is applied from the tongue to the lock plate to one side, the amount of movement to one side due to elastic deformation of the lock plate can be increased.

JP-A-2007-151677

In consideration of the above facts, an object of the present invention is to obtain a buckle device capable of increasing the amount of movement to one side due to elastic deformation of the limiting member when a load is applied from the tongue to the limiting member. ..

In the buckle device of the first aspect of the present invention, a support body provided with a pair of support portions and an engaging portion are arranged on one side of the pair of supported portions, and the pair of the supported portions have a pair of the supported portions. Is supported and rotatable, and the engaging portion engages with the tongue provided on the webbing to limit the movement of the tongue to one side and the webbing is mounted on the occupant. The limiting member is provided between the supported portions, and the supported portions are opened to the other side, and the supported portion is arranged to one side from the supported position on one side by the supported portion. It is provided with a recess.

The buckle device according to the second aspect of the present invention is provided in the buckle device according to the first aspect of the present invention on one side of the restricted member from the supported portion, and the recess is arranged to the other side to one side. It is provided with a regulated portion in which the movement of the restricting member is restricted and the movement of the restricting member to one side is restricted.

The buckle device according to the third aspect of the present invention is the buckle device according to the first aspect or the second aspect of the present invention, in which the limiting member is provided with a through hole penetrating the limiting member on one side from the recess, and the limiting member is described. It is provided between the recess and the through hole, and includes a connecting portion for connecting the pair of supported portions.

The buckle device according to the fourth aspect of the present invention is provided in the limiting member in any one of the first to third aspects of the present invention, and is projected into the recess to support the supported portion. It is provided with a protruding portion that limits the tilt toward the concave portion.

In the buckle device according to the fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the strength of the portion of the supported portion opposite to the supported portion is the supported portion. It is made larger than the strength of the portion on the support portion side of the portion.

In the buckle device according to the sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, the peripheral surface of the recess is made smooth.

In the buckle device of the first aspect of the present invention, the engaging portion is arranged on one side of the pair of supported portions in the limiting member. Further, a pair of supported portions are supported by the pair of supporting portions of the support, so that the limiting member can be rotated. Further, by engaging the engaging portion with the tongue provided on the webbing, the limiting member restricts the movement of the tongue to one side, and the webbing is attached to the occupant.

Here, the limiting member is provided with a recess between the supported portions, and the recess opens the space between the supported portions to the other side and extends from the supported position on one side by the supported portion of the supported portion to one side. Be placed. Therefore, when a load is applied from the tongue to the limiting member to one side, the supported portion can be tilted (elastically deformed) toward the concave portion, and the amount of movement to one side due to the elastic deformation of the limiting member can be increased.

In the buckle device of the second aspect of the present invention, the restricted member is provided with a regulated portion on one side of the supported portion, and the movement of the restricted portion to one side is restricted to one side of the restricted member. Movement is restricted.

Here, the recess is arranged up to the other side of the regulated portion. Therefore, when the supported portion is tilted toward the concave portion, the displacement of the regulated portion can be suppressed, and the movement of the limiting member to one side can be appropriately regulated.

In the buckle device of the third aspect of the present invention, the limiting member is provided with a through hole penetrating the recess on one side, and the limiting member is provided with a connecting portion between the recess and the through hole. Connects a pair of supported parts. Therefore, the amount of tilt (elastic deformation amount) of the supported portion toward the concave portion can be adjusted by the connecting portion.

In the buckle device of the fourth aspect of the present invention, the limiting member is provided with a protruding portion, and the protruding portion is projected into the recess, and the protruding portion limits the tilting of the supported portion toward the recess. Therefore, it is possible to limit the excessive tilting of the supported portion toward the concave portion.

In the buckle device of the fifth aspect of the present invention, the strength of the portion of the supported portion opposite to the supported portion is increased as compared with the strength of the portion of the supported portion on the supported portion side. Therefore, when the supported portion is tilted toward the concave portion, the deforming force applied to the portion of the supported portion opposite to the supported portion is increased as compared with the portion of the supported portion on the supported portion side. However, the plastic deformation of the supported portion can be suppressed.

In the buckle device of the sixth aspect of the present invention, the peripheral surface of the recess is made a smooth surface. Therefore, when the supported portion is tilted toward the concave portion, the plastic deformation of the limiting member around the concave portion can be suppressed.

FIG. 3 is an exploded perspective view showing a buckle device and a tongue plate according to the first embodiment of the present invention as seen from the front diagonally left side. (A) and (B) are cross-sectional views seen from the left which showed the buckle apparatus and the tongue plate which concerns on 1st Embodiment of this invention, and (A) shows the tongue plate non-attached state of the buckle apparatus. , (B) show the tongue plate mounting state of the buckle device. (A) and (B) are views showing the lock plate of the buckle device according to the first embodiment of the present invention, (A) is a plan view seen from the front side, and (B) is a front diagonal view. It is a perspective view seen from the left. (A) and (B) are cross-sectional views seen from the left which showed the buckle apparatus and the tongue plate which concerns on 2nd Embodiment of this invention, and (A) shows the tongue plate non-attached state of the buckle apparatus. , (B) show the tongue plate mounting state of the buckle device.

[First Embodiment]
FIG. 1 shows an exploded perspective view of the buckle device 10 according to the first embodiment of the present invention as viewed from the front diagonally left side, and FIG. 2A shows the buckle device 10 from the left side. It is shown in the cross-sectional view seen. In the drawing, the front side of the buckle device 10 is indicated by an arrow UP, the front side (one in the thickness direction) of the buckle device 10 is indicated by an arrow SF, and the left side of the buckle device 10 is indicated by an arrow LH.

The buckle device 10 according to the present embodiment is installed on the lower side and one side of the seat of the vehicle, the front side of the buckle device 10 is directed to the upper side of the vehicle, and the back side of the buckle device 10 (the other side in the thickness direction). Is directed toward the seat side (the occupant side seated on the seat).

As shown in FIGS. 1 and 2A, the buckle device 10 is provided with a cover 12 made of resin as an insert and having a substantially rectangular parallelepiped shape. The cover 12 is configured by assembling the upper cover 12A on the front side and the lower cover 12B on the back side. The upper cover 12A constitutes the front end portion of the cover 12 and the front side portion other than the front end portion, and the lower cover 12B is , Consists of a back side portion other than the front end portion of the cover 12.

A tongue insertion port 14 is formed at the front end of the cover 12, and a tongue plate 16 as a tongue can be inserted into the tongue insertion port 14 from the front side. A rectangular flat plate-shaped insertion portion 16A is provided at the tip of the tongue plate 16, and the tongue plate 16 can be inserted into the tongue insertion port 14 at the insertion portion 16A, and the insertion portion 16A has a rectangular shape. An engaging hole 18 having a shape is formed through.

A long strip-shaped webbing 20 is movably penetrated through the base end portion of the tongue plate 16, and the webbing 20 is wound by a winding device (not shown). The take-up device is installed in the vehicle, and the webbing 20 is retractable from the take-up device. The take-up device is provided with a lock mechanism, and in an emergency of the vehicle (for example, in the event of a collision), the lock mechanism locks the drawer of the webbing 20 from the take-up device.

A buckle body 22 made of metal as a support and having a U-shaped cross section is fixed in the cover 12, and the inside of the buckle body 22 is open to the front side. The back side portion of the buckle body 22 is formed as a long flat plate-shaped bottom plate 22A, and the bottom plate 22A is arranged vertically in the front and back directions. The left side portion and the right side portion of the buckle body 22 are formed into a long flat plate-shaped side plate 22B, and the side plate 22B is arranged vertically in the left-right direction. The inside of the buckle body 22 is communicated with the tongue insertion port 14 of the cover 12, and the insertion portion 16A of the tongue plate 16 inserted into the tongue insertion port 14 is inserted into the buckle body 22 from the front side.

A substantially rectangular insertion hole 24 is formed through the bottom plate 22A, and the insertion hole 24 is extended in the front-rear direction. A substantially rectangular support hole 26 as a support portion is formed through the rear portion of each side plate 22B, and the pair of support holes 26 are opposed to each other in the left-right direction and are opened to the upper side. A substantially rectangular regulation hole 28 as a regulation portion is formed through the middle portion in the front-rear direction of each side plate 22B, and the pair of regulation holes 28 are opposed to each other in the left-right direction and are opened to the upper side respectively. There is.

A long plate-shaped anchor plate 30 is inserted into the buckle body 22 from the rear side, and the tip end portion (front end portion) of the anchor plate 30 is fixed to the rear end portion of the bottom plate 22A of the buckle body 22. It is fixed by the rivet 32 as. The rivet 32 is formed into a substantially columnar shape and penetrates through the bottom plate 22A and the anchor plate 30, and the rivet 32 has both ends in the axial direction (front end and back end) expanded in diameter and both ends in the axial direction. The bottom plate 22A and the anchor plate 30 are sandwiched between them. The anchor plate 30 extends rearward from the cover 12 and has a base end (rear end) fixed to the vehicle body or a seat, whereby the buckle device 10 is installed in the vehicle.

A substantially plate-shaped ejector 34 made of resin as a moving member is engaged with the insertion hole 24 of the bottom plate 22A of the buckle body 22, and the ejector 34 is slidable in the front-rear direction along the insertion hole 24. ing. A pressing surface 34A is formed on the front surface of the ejector 34, and the pressing surface 34A is arranged on the front side of the bottom plate 22A.

An ejector spring 36 (compression coil spring) as an urging means is hung between the ejector 34 and the rear end of the insertion hole 24, and the ejector spring 36 urges the ejector 34 forward to the front side. Is located at the discharge position (see FIG. 2 (A)). When the insertion portion 16A of the tongue plate 16 is inserted into the buckle body 22 from the front side, the pressing surface 34A of the ejector 34 is pressed backward by the insertion portion 16A, so that the ejector 34 is attached to the ejector spring 36. It is slid backwards against the forces and placed at the rear insertion position (see FIG. 2B).

In the buckle body 22, a metal plate-shaped lock plate 38 (see (A) and (B) in FIG. 3) as a limiting member is arranged on the front side of the ejector 34, and the lock plate 38 is The shape is symmetrical with respect to the central surface in the left-right direction.

A support plate 40 as a supported portion is formed on the left side portion and the right side portion of the lock plate 38, and the rear portion of the support plate 40 is formed into a rectangular plate-shaped shaft portion 40A to lock. The plate 38 is projected outward in the left-right direction. The shaft portion 40A is inserted through the support hole 26 of the side plate 22B of the buckle body 22, and the lock plate 38 is supported by the buckle body 22 in the pair of shaft portions 40A, and is supported on the back side and the front side with the shaft portion 40A as the center. It is made rotatable.

The front side portion of the support plate 40 is formed into a flexible portion 40B, and extends inward in the left-right direction of the lock plate 38 toward the front, and the flexible portion 40B and the shaft portion 40A of the support plate 40 are extended. Both sides of the boundary portion with and are curved. The width dimension of the flexible portion 40B is gradually increased toward the front side (inside in the left-right direction of the lock plate 38), and the strength of the flexible portion 40B is gradually increased toward the front side. Further, the outer portion (the outer portion in the left-right direction of the lock plate 38) of the front end surface (the front end surface of the flexible portion 40B) of the support plate 40 is curved in a concave shape.

The inner portion of the front end surface of each support plate 40 (the inner portion in the left-right direction of the lock plate 38) is connected by a substantially V-shaped plate-shaped connection plate 38A as a connection portion, and the connection plate 38A is projected to the front side. At the same time, the central portion of the front surface and the rear surface in the left-right direction is curved. The front surface of the connection plate 38A is smoothly connected to the outer side of the front end surface of each support plate 40, and the rear surface of the connection plate 38A is the inner surface of the flexible portion 40B of each support plate 40 (lock plate 38 left-right direction). It is continuous with the inner surface). The width dimension of the connection plate 38A is made constant and smaller than the width dimension of the shaft portion 40A of the support plate 40, and the strength of the connection plate 38A is smaller than the strength of the shaft portion 40A. There is.

A substantially rectangular through hole 42 is formed through the central portion of the lock plate 38, and the rear surface of the through hole 42 is formed by the front surface of the connection plate 38A and the outer portion of the front end surface of each support plate 40. There is. The rear portion of the through hole 42 is gradually expanded to both sides in the left-right direction toward the rear, and the rear portions of the left and right surfaces of the through hole 42 are smoothly connected to the outer portion of the front end surface of the support plate 40. Further, the left and right corner surfaces on the front side of the through hole 42 are curved.

The lock plate 38 is formed with a long plate-shaped outer plate 38B as a side portion on both outer sides in the left-right direction of the through hole 42, and the outer plate 38B is extended in the front-rear direction. The outer plate 38B is connected to the outer surface of the flexible portion 40B of the support plate 40 (the outer surface in the left-right direction of the lock plate 38), and can be connected to the outer surface of the outer plate 38B (the outer surface in the left-right direction of the lock plate 38). The boundary portion of the flexible portion 40B with the outer surface is curved.

A substantially triangular recess 44 is formed through the rear portion of the lock plate 38, and the peripheral surface of the recess 44 is formed by the rear surface of the connection plate 38A and the inner surface of the flexible portion 40B of each support plate 40. At the same time, it is open to the rear side. Further, the rivet 32 is arranged on the back side of the recess 44, and the front end of the recess 44 (center in the left-right direction of the peripheral surface) is arranged on the front side of the rear portion of the support plate 40.

A substantially rectangular plate-shaped projecting piece 38C as a projecting portion is integrally formed on the flexible portion 40B of each support plate 40, and the projecting piece 38C projects inward in the left-right direction of the lock plate 38. The boundary portion between the front surface and the rear surface of the projecting piece 38C and the outer surface of the flexible portion 40B is curved, and the projecting piece 38C projects into the recess 44. The pair of projecting pieces 38C are opposed to each other in the left-right direction, and the projecting end surface of the projecting piece 38C (the inner surface in the left-right direction of the lock plate 38) is inclined inward in the left-right direction of the lock plate 38 toward the front. Has been done.

A substantially rectangular plate-shaped regulation piece 38D as a regulated portion is integrally formed in the front-rear intermediate portion of each outer plate 38B, and the regulation piece 38D is projected outward in the left-right direction of the lock plate 38. .. The regulation piece 38D is inserted into the regulation hole 28 of the side plate 22B of the buckle body 22, and the regulation piece 38D is separated from the front surface to the rear side of the regulation hole 28. The rear surface of the restricting piece 38D is arranged on the front side from the front end (center in the left-right direction of the front surface) of the connecting plate 38A, and the front end of the recess 44 (center in the left-right direction of the rear surface of the connecting plate 38A) is located on the rear surface of the restricting piece 38D. It is located on the rear side.

A plate-shaped arm 38E is integrally formed on the rear portion of each outer plate 38B, and the arm portion 38E is projected outward in the left-right direction of the lock plate 38, and the front and rear surfaces and the outer surface of the outer plate 38B are formed. The boundary portion with and is curved and extends in the direction toward the back side. The arm portion 38E is inserted in the buckle body 22, and when the ejector 34 is slid rearward from the ejection position, each arm portion 38E is pressed rearward by the ejector 34, and the lock plate 38 is rotated to the back side. It is moved (see FIG. 2 (B)).

A substantially rectangular plate-shaped engaging piece 38F as an engaging portion is formed at the front end portion of the lock plate 38, and the engaging piece 38F extends forward in the direction toward the back side. The engaging piece 38F is in contact with the front side surface of the ejector 34, whereby rotation of the lock plate 38 to the back side is prevented, and the lock plate 38 is held at the release position on the front side. When the lock plate 38 is rotated to the back side and reaches the engagement position on the back side, the engagement piece 38F is inserted (engaged) into the engagement hole 18 of the tongue plate 16 and the buckle body 22 is inserted. By being inserted into the hole 24, the engaging piece 38F restricts the tongue plate 16 from sliding forward (see FIG. 2B).

At the front end of the lock plate 38, rectangular plate-shaped contact pieces 38G are formed on both outer sides of the engagement piece 38F in the left-right direction, and the contact pieces 38G are projected to the front side.

In the cover 12, a columnar lock member 46 (cam) is provided on the front side and the front side of the lock plate 38, and the lock member 46 is arranged along the left-right direction. A columnar shaft 46A protrudes from both ends in the left-right direction of the lock member 46, and the shaft 46A is rotatably supported by each side plate 22B of the buckle body 22, so that the lock member 46 is shafted to the buckle body 22. It is supported so as to be swingable around 46A.

A substantially plate-shaped pressed portion 46B is formed on the front side portion of the lock member 46, and the pressed portion 46B is projected to the front side. The rear surface of the back side portion of the lock member 46 is a contact surface 46C, the contact surface 46C is in contact with the front surface of the contact piece 38G of the lock plate 38, and the lock member 46 is held in the unlocked position. ing. The back surface of the lock member 46 is a lock surface 46D, and the lock surface 46D is a circumferential surface coaxial with the shaft 46A. When the lock plate 38 is arranged at the engaging position, the lock member 46 is swung to the lock position, and the lock surface 46D is brought into contact with the front surface surface of the contact piece 38G of the lock plate 38 (FIG. 2). (B)).

A resin-made, substantially U-shaped frame-shaped holder 48 is attached to the back side portion of the lock member 46, and the holder 48 is arranged on the front side of the back side portion of the lock member 46. A substantially rectangular plate-shaped spring hold portion 48A is formed in the central portion of the holder 48 in the left-right direction, and the spring hold portion 48A is projected to the front side.

A release button 50 as an operation member is provided on the front side of the lock member 46, and the front surface of the release button 50 is exposed from the front end of the cover 12. The rear portion of the release button 50 is engaged with each side plate 22B of the buckle body 22, and the release button 50 is supported by the buckle body 22 so as to be movable in the front-rear direction within a predetermined range.

A box-shaped operation unit 50A is provided on the front side portion of the release button 50, and the operation unit 50A forms a tongue insertion port 14 at the front end of the cover 12 with the lower cover 12B, and the inside is on the rear side. It is open. Further, the release button 50 can be pressed backward by the occupant in the operation unit 50A.

The release button 50 is formed with a pressing portion 50B on the front side and the rear side of the operating portion 50A, and the pressing portion 50B is projected to the rear side. The pressing portion 50B is arranged on the front side of the pressed portion 46B of the lock member 46, and when the release button 50 is pressed backward, the pressed portion 46B is pressed backward by the pressing portion 50B. The lock member 46 is swung toward the unlock position side.

A lock spring 52 (compression coil spring) is hung between the front wall of the operation portion 50A of the release button 50 and the spring hold portion 48A of the holder 48, and the lock spring 52 is a lock member via the holder 48. 46 is urged to the lock position side.

The buckle device 10 is miniaturized in the front-rear direction, and the dimensions of the cover 12, the buckle body 22, the lock plate 38, and the like in the front-rear direction are reduced.

Next, the operation of this embodiment will be described.

In the buckle device 10 having the above configuration, when the insertion portion 16A of the tongue plate 16 is inserted into the tongue insertion opening 14 at the front end of the cover 12, the pressing surface 34A of the ejector 34 is pressed backward by the insertion portion 16A. , The ejector 34 is slid backward against the urging force of the ejector spring 36, and is slid from the discharge position to the insertion position. Therefore, the ejector 34 is slid rearward from the engaging piece 38F of the lock plate 38 and presses each arm portion 38E of the lock plate 38 rearward, so that the lock plate 38 is rotated to the back side. It is rotated from the release position to the engagement position.

As a result, the engaging piece 38F is inserted into the engaging hole 18 of the insertion portion 16A and inserted into the insertion hole 24 of the buckle body 22. Further, the contact piece 38G of the lock plate 38 is rotated to the back side from the contact surface 46C of the lock member 46, and the lock member 46 is swung from the unlock position to the lock position by the urging force of the lock spring 52. Then, the lock surface 46D of the lock member 46 is brought into contact with the front surface surface of the contact piece 38G, and the rotation of the lock plate 38 from the engagement position to the release position is restricted. Therefore, the rear surface of the engaging hole 18 is brought into contact with the engaging piece 38F, and the engaging piece 38F restricts the forward movement of the tongue plate 16, so that the tongue plate 16 is locked to the buckle device 10. The webbing 20 is attached to the occupant.

When the operation portion 50A of the release button 50 is pressed backward, the pressed portion 46B of the lock member 46 is pressed backward by the pressing portion 50B of the release button 50, and the lock member 46 is attached with the lock spring 52. By swinging from the lock position to the unlock position against the force, the lock surface 46D of the lock member 46 is swung forward from the contact piece 38G of the lock plate 38, and the lock plate 38 by the lock member 46 The rotation regulation of is lifted. Therefore, the ejector spring 36 moves the engaging piece 38F of the ejector 34, the tongue plate 16, and the lock plate 38 forward by the urging force, and the lock plate 38 is rotated from the engaging position to the disengaging position. The engaging piece 38F is disengaged from the insertion hole 24 of the buckle body 22 and disengaged from the engaging hole 18 of the insertion portion 16A of the tongue plate 16. Further, the ejector 34 is slid forward to the discharge position by the urging force of the ejector spring 36, and the insertion portion 16A is discharged from the tongue insertion port 14 at the front end of the cover 12 by the ejector 34, so that the tongue plate to the buckle device 10 is ejected. The lock of 16 is released, and the webbing 20 is released from being attached to the occupant.

By the way, in an emergency of a vehicle, the locking mechanism of the take-up device locks the drawer of the webbing 20 from the take-up device, so that the occupant wearing the webbing 20 is restrained by the webbing 20. Further, when a load is applied to the webbing 20 from the occupant, a forward load is applied from the webbing 20 to the tongue plate 16 to lock the tongue plate 16 from the insertion portion 16A (rear surface of the engagement hole 18). A forward load is applied to the engaging piece 38F of the plate 38. Therefore, the shaft portion 40A of the support plate 40 of the lock plate 38 is in contact with the front surface of the support hole 26 of the buckle body 22, and the shaft portion 40A is brought into contact with the flexible portion 40B of the support plate 40 by the front surface of the support hole 26. By tilting (elastically deforming) to the rear side, the lock plate 38 (the portion on the front side of the support hole 26) is moved to the front side.

Here, a recess 44 is formed through the lock plate 38 on the rear side of the flexible portion 40B and the connection plate 38A of each support plate 40, and the recess 44 is opened to the rear side and the support plate 40 is formed. It is arranged from the front surface of the shaft portion 40A (supported position on the front side by the support hole 26 of the shaft portion 40A) to the front side. Therefore, as described above, when a forward load is applied from the insertion portion 16A of the tongue plate 16 to the engaging piece 38F of the lock plate 38, the support plate 40 is on the concave portion 44 side (inside in the left-right direction of the lock plate 38). ) Can be tilted (elastically deformed) to increase the amount of tilting of the shaft portion 40A to the rear side, and the amount of displacement of the shaft portion 40A inward in the left-right direction of the lock plate 38 can be increased to the front side of the lock plate 38. The amount of movement can be increased. As a result, even when the size of the lock plate 38 in the front-rear direction is reduced and the amount of elastic deformation of the lock plate 38 to the front side of the support plate 40 is small, the amount of movement of the lock plate 38 to the front side due to the elastic deformation is small. It can be made large (for example, the lock plate 38 can be elastically deformed until the engaging piece 38F abuts on the front surface of the insertion hole 24 of the buckle body 22), and the plastic deformation of the lock plate 38 can be suppressed.

Further, a connection plate 38A is formed in the lock plate 38 between the recess 44 and the through hole 42, and the connection plate 38A connects the pair of support plates 40. Therefore, by adjusting the width dimension of the connecting plate 38A and adjusting the strength of the connecting plate 38A, the amount of tilt (elastic deformation amount) of the support plate 40 toward the recess 44 can be adjusted, and the lock plate 38 can be adjusted. The amount of movement to the front due to elastic deformation can be adjusted.

Further, the width dimension of the flexible portion 40B of the support plate 40 is gradually increased toward the front side, and the strength of the flexible portion 40B is gradually increased toward the front side. Therefore, when the support plate 40 is tilted toward the recess 44, the deformation force acting on the flexible portion 40B may be gradually increased toward the front side (as it is separated from the support hole 26). The stress applied to the flexible portion 40B can be equalized, and the plastic deformation of the flexible portion 40B can be suppressed.

Further, both side surfaces of the boundary portion between the shaft portion 40A and the flexible portion 40B of the support plate 40, both side surfaces of the connection portion between the support plate 40 and the connection plate 38A, both side surfaces of the central portion in the left-right direction of the connection plate 38A, and The side surface (including the peripheral surface of the recess 44) of the connection portion between the outer plate 38B of the support plate 40 and the projecting piece 38C is made smooth. Therefore, since the bent surface is not formed on the side surfaces of the support plate 40 and the connection plate 38A, when the support plate 40 is tilted toward the recess 44, stress is applied to a part of the side surfaces of the support plate 40 and the connection plate 38A. Concentration can be suppressed, and plastic deformation of the support plate 40 and the connection plate 38A can be suppressed.

Further, when an excessive forward load is applied from the insertion portion 16A of the tongue plate 16 to the engaging piece 38F of the lock plate 38, the restricting piece 38D of the lock plate 38 is the front surface of the restricting hole 28 of the buckle body 22. The movement of the control piece 38D to the front side is restricted by being abutted against the lock plate 38, so that the excessive movement of the lock plate 38 to the front side is restricted.

Here, the recess 44 is arranged up to the rear side of the rear surface of the regulation piece 38D. Therefore, when the support plate 40 is tilted toward the recess 44, it is possible to prevent the restricting piece 38D from being displaced inward in the left-right direction of the lock plate 38. As a result, even when an excessive forward load is applied from the insertion portion 16A of the tongue plate 16 to the engaging piece 38F of the lock plate 38, the front surface of the restricting hole 28 can appropriately move the restricting piece 38D to the front side. It can be regulated and the excessive movement of the lock plate 38 to the front side can be properly regulated.

Further, the projecting piece 38C protrudes from the support plate 40 into the recess 44. Therefore, even when an excessive forward load is applied from the insertion portion 16A of the tongue plate 16 to the engaging piece 38F of the lock plate 38, the protruding tip surfaces of the pair of protruding pieces 38C are in contact with each other to support them. Excessive tilting of the plate 40 toward the recess 44 is restricted. Thereby, the support plate 40 can be restricted from being separated from the support hole 26, and the excessive movement of the lock plate 38 to the front side can be appropriately regulated.

[Second Embodiment]
FIG. 4A shows a cross-sectional view of the buckle device 60 according to the second embodiment of the present invention as viewed from the left, and FIG. 4B shows a tongue plate 16 of the buckle device 60. The mounted state is shown in a cross-sectional view seen from the left.

The buckle device 60 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

As shown in FIGS. 4A and 4B, the buckle device 60 according to the present embodiment is not provided with the anchor plate 30 and the rivet 32 in the first embodiment.

The tip of the belt-shaped belt 62 as a fixing portion is inserted into the rear end of the bottom plate 22A of the buckle body 22, and the insertion portion of the tip of the belt 62 into the rear end of the bottom plate 22A is the lock plate 38. It is arranged on the back side of the recess 44. The tip of the belt 62 is formed in an annular shape and is fixed to the rear end of the bottom plate 22A, and the base end of the belt 62 is fixed to the vehicle body or the seat, whereby the buckle device 60 is fixed to the vehicle. It is installed in.

Here, also in this embodiment, the same actions and effects as those in the first embodiment can be obtained.

In the first and second embodiments, the protruding piece 38C is integrally formed with the support plate 40 of the lock plate 38. However, it is not necessary to integrally form the projecting piece 38C on the support plate 40 of the lock plate 38. As a result, in the first embodiment, when the rivet 32 is arranged on the back side of the recess 44 of the lock plate 38, the tip portion of the anchor plate 30 and the bottom plate 22A of the buckle body 22 are arranged by the rivet 32 from the front side of the recess 44. Can be easily fixed to the rear end. Moreover, in the second embodiment, when the insertion portion of the tip of the belt 62 into the rear end of the bottom plate 22A is arranged on the back side of the recess 44 of the lock plate 38, the front end of the recess 44 to the rear end of the bottom plate 22A. The tip of the belt 62 can be easily inserted into the portion.

10 ... buckle device, 16 ... tongue plate (tong), 20 ... webbing, 22 ... buckle body (support), 26 ... support hole (support), 38 ... lock Plate (restricting member), 38A ... connection plate (connection part), 38C ... projecting piece (projecting part), 38D ... regulated piece (regulated part), 38F ... engaging piece (engagement) Part), 40 ... Support plate (supported part), 42 ... Through hole, 44 ... Recess, 60 ... Buckle device

Claims (5)

A support provided with a pair of supports and
An engaging portion is arranged on one side of the pair of supported portions, and the pair of the supported portions are supported by the pair of the supporting portions to be rotatable, and the engaging portion is attached to the tongue provided on the webbing. Engage with a limiting member that limits the movement of the tongue to one side and the webbing is attached to the occupant.
A recess provided in the limiting member between the supported portions, which opens the space between the supported portions to the other side and is arranged to one side from the supported position on one side of the supported portion by the supported portion. ,
A through hole provided in the limiting member on one side of the recess,
A connecting portion provided in the limiting member between the recess and the through hole, connecting the pair of supported portions, and extending in a direction toward one side from both end sides toward the center side.
A buckle device equipped with. The restricting member is provided on one side of the supported portion, and the recess is arranged to the other side, and the restricted movement is restricted to one side and the movement to one side of the restricting member is restricted. The buckle device according to claim 1. The buckle device according to claim 1 or 2, wherein the buckle device is provided on the limiting member and is provided with a protruding portion that protrudes into the recess and limits the tilt of the supported portion toward the recess . The one according to any one of claims 1 to 3 , wherein the strength of the portion of the supported portion opposite to the supported portion is increased as compared with the strength of the portion of the supported portion on the supported portion side . Buckle device. The buckle device according to any one of claims 1 to 4, wherein the peripheral surface of the recess is made smooth .

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