JPH0714092Y2 - Anchor structure of automobile seat belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an anchor structure for an automobile seat belt.

(Prior Art) Conventionally, as an anchor structure of an automobile seat belt,
It is known that when a large load is applied to the seat belt due to a collision accident, the anchor plate is plastically deformed and bent, so that the seat belt is strongly locked. (See Japanese Patent No. 26665). This is because the bracket is attached to the seat rotatably around a horizontal axis at a position away from the connection point with the seat belt, and when a tensile force is applied from the seat belt to the connection point, the bracket engages the anchor plate from above and below. In this state, the entire body rotates relative to the anchor plate, so that a large bending moment is applied to the anchor plate.

However, if the anchor plate is positively plastically deformed and bent, the anchor plate itself may be broken when the load acting on the seat belt is excessive. In this case, the occupant cannot be restrained to the seat and the function as the seat belt cannot be achieved.

Further, since the anchor plate has a structure that is easily bent, the anchor plate may be bent due to repeated light load on the seat belt. In this case, the bracket does not follow the movement of the seat even if the seat is slid during normal use, and therefore the anchor plate needs to be replaced and repaired.

(Purpose of the Invention) The present invention has been made in order to solve such a conventional problem, and can reliably lock the seat belt even if an excessive load acts on the seat belt due to a collision accident or the like. The present invention provides an anchor structure for an automobile seat belt that can be manufactured and has high durability.

(Structure of the Invention) According to the present invention, an anchor plate having an engaging portion formed on an upper edge thereof and an insertion portion fixed to a seat and movably inserted through the anchor plate are formed on the insertion portion. A bracket having a support portion that abuts a lower edge of the anchor plate, and a bracket whose base end portion is rotatably supported by the bracket about a horizontal axis, and whose tip portion engages with the engagement portion of the anchor plate. The anchor plate has a hook having a pawl formed therein, a central portion rotatably supported by the bracket about a horizontal axis, and a cam to which a seat belt end is connected at a base end portion. Is mounted on the vehicle body at the rear side of the seat so as to be rotatable around a horizontal axis, and the cam and hook are pressed by the cam by the load acting on the seat belt. As a result, the hook is arranged so that its locking claw is rotated in a direction in which the locking claw engages with the engaging part of the anchor plate, and the locking claw and the supporting part are arranged so as to face each other with the anchor plate interposed therebetween. It has been done.

According to the above configuration, the cam presses the hook due to the load acting on the seat belt, and the locking claw of the hook is engaged with the engaging portion of the anchor plate by this pressing force, whereby the anchor plate is locked by the locking claw. The seat belt is securely locked by being sandwiched by the support shaft. Further, in the locked state, the locking claws sandwiching the anchor plate and the support shaft face each other at a right angle to the axial direction of the anchor plate, and the anchor and the anchor plate rotate together in the locked state to the acting direction of the load in the locked state. It is possible to prevent an excessive bending moment from acting on the plate.

(Embodiment) In FIG. 1, a seat 1 is attached to a vehicle body 2 via a slide rail 3, and the slide rail 3 moves the seat 1 in the front-rear direction of the vehicle (left-right direction in the drawing) to adjust the position. Is being done. On the side of the seat bottom 11 of the seat 1, a band-plate-shaped anchor plate 4 is arranged in the moving direction of the seat 1, and the bracket 5 is attached to the seat bottom 11 with the anchor plate 4 movably inserted. The bracket 5 is attached with the buckle 61 of the seat belt 6.

The anchor plate 4 is attached to the vehicle body 2 such that its rear end portion is rotated around a horizontal axis by a shaft pin 41. As shown in FIG. 2, a plurality of engaging portions 42 formed of irregularities are formed on the upper edge of the anchor plate 4 at regular intervals, and the lower edge is formed in a straight line.

As shown in FIG. 2, the bracket 5 is formed by stacking a pair of bracket pieces 5a, 5b on the inside and the outside and integrally joining them with a rivet 51. The bracket 5 is located on both front and rear sides of the inner bracket piece 5a. Mounting piece 54 formed on
It is attached to the side portion of the seat bottom 11 by means of a screw 55 via. The attachment with the screws 55 is set to such an attachment strength that the position of the bracket 5 can be held when a slight load is applied to the seat belt 6.

An insertion portion 52 of the anchor plate 4 is formed in the lower portion of the anchor plate 5 by bending the opposing surfaces of the pair of bracket pieces 5a, 5b into a concave groove shape. A support shaft (support part) 53 is attached to the rear end of the insertion part 52, and the anchor plate 4 is arranged so that the lower edge thereof abuts on the support shaft 53 as shown in FIG.

As shown in FIGS. 2 and 3, a hook 7 and a cam 8 are arranged above the insertion portion 52 between the opposed surfaces of the pair of bracket pieces 5a, 5b, and the base end of the hook 7 is a bracket. 5 and the cam 8 on the rear of the bracket 5 so that the front end of the cam 8 contacts the upper edge of the intermediate portion of the hook 7.
And a shaft 81 so as to be rotatable about a horizontal axis.

A locking claw 72 is formed at the tip of the hook 7, and the locking claw 72 is formed.
72 is disposed so as to face the engaging portion 42 of the anchor plate 4 of the bracket 5 and to face the support shaft 53 substantially vertically with the anchor plate 4 interposed therebetween. The lower edge of the hook 7 abuts on a support piece 56 formed by cutting and raising the side wall of the bracket 5 inward, and the support piece 56 supports the hook 7 so as not to rotate further toward the anchor plate 4 side. The locking claw 72 and the engaging portion 42 of the anchor plate 4 are positionally fixed in a state of being separated from each other.

As shown in FIGS. 2 and 3, an angular shaft 82 is penetrated through the rear end portion of the cam 8, and a buckle fitting 611 is rotatably attached around the horizontal axis at the tip end portion of the angular shaft 82. There is. This square shaft 82 is the long hole 5 formed in the bracket pieces 5a, 5b.
A direction in which the cam 8 presses the hook 7 downward by the tensile force acting on the seat belt 6 and the hook 7 engages with the anchor plate 4 by being supported by 7 so as to draw a rotation locus about the axis 81. I am trying to rotate.

In the seat belt anchor structure having the above-described structure, the hook 7 is provided with a support piece 56 as shown in FIG. 3 during normal use.
The engaging claw 72 causes the engaging portion 42 of the anchor plate 4 to
Since the position of the seat 1 is separated from each other, the bracket 5 slides along the lower edge of the anchor plate 4 even if the seat 1 slides as shown by the one-dot chain line in FIG. By following the movement, the slide position can be adjusted while wearing the seat belt 6.

When the vehicle suddenly stops or causes a slight collision, a diagonally forward load is applied to the seat belt 6 as indicated by an arrow of a chain line in FIG. When this load reaches a predetermined amount, the cam 8 rotates around the shaft 81 and presses the hook 7 downward, and this pressing force causes the hook 7 to support the support piece 56.
Is plastically deformed and rotated about the axis 71. The anchor plate 4 is sandwiched between the locking claw 72 and the support shaft 53,
The seat belt 6 is locked by the engaging claw 72 and the engaging portion of the anchor plate 4 engaging each other, and the load acting on the seat belt 6 is seated via the screw 55.
The seat belt 6 is transmitted to the seat 11, and is supported by the seat bottom 11.

When the car has a stronger collision, the seat belt 6
The excessive load acting on the seat bottom 11 deforms the mounting portion between the seat bottom 11 and the bracket 5, so that the bracket 5 and the anchor plate 4 move in a direction substantially the same as the acting direction of the load on the seat belt 6 as shown in FIG. It rotates centering on the shaft pin 41 until it becomes. As a result, the load acting on the seat belt 6 is transmitted to the vehicle body 2 via the shaft pin 41, and the seat belt 6 is supported by the vehicle body 2.

At this time, the transmission of the load to the anchor plate 4 is performed by the anchor plate 4 being sandwiched by the locking claw 72 and the support shaft 53 which are arranged to face each other at substantially right angles to the axial direction of the anchor plate 4. Therefore, it is possible to prevent an excessive bending moment from acting on the portion for transmitting the load to the anchor plate 4. Therefore, the anchor plate 4 does not bend or break,
The load acting on the seat belt 6 can be reliably transmitted to the vehicle body 2 and the restraint state of the occupant on the seat 1 can be reliably maintained.

4 and 5, it is conceivable to arrange the cam 8 so that the upper edge of the tip of the hook 7 is pressed by the cam 8. However, in this embodiment, the rotation of the hook 7 is greater than that in this case. Since the length from the center (shaft 71) to the contact portion between the hook 7 and the cam 8 is set to be smaller than the length from the rotation center to the locking pawl 72, the seat belt 6 is locked. It is possible to reduce the amount of movement of the seat belt 6 up to.

(Effect of the Invention) According to the anchor structure of the seat belt for an automobile of the present invention, even if an excessive load acts on the seat belt due to a collision accident, the anchor plate does not bend or break and the load is reliably applied to the vehicle body. And the restraint state of the occupant to the seat can be reliably maintained. Moreover, during normal use, the seat can be slid while the seat belt is worn, and the durability of each component can be improved.

[Brief description of drawings]

1 is an explanatory side view of a seat to which an embodiment of the present invention is applied, FIG. 2 is an exploded perspective view of the anchor structure of FIG. 1, and FIG.
FIG. 4 is a sectional explanatory view at the time of normal use, FIG. 4 is a sectional explanatory view when a light load is applied, and FIG. 5 is a sectional explanatory view when an excessive load is applied. 1 ... Seat, 2 ... Car body, 4 ... Anchor plate,
5 ... Bracket, 6 ... Seat belt, 7 ... Hook, 8 ... Cam, 42 ... Engaging portion, 52 ... Inserting portion, 53 ...
Support shaft (support part), 72 ... Locking claw.

Claims (1)

[Scope of utility model registration request] 1. An anchor plate having an engaging portion formed at an upper edge thereof, and an insertion portion fixed to a sheet and movably inserted through the anchor plate, and the insertion portion is provided with the anchor plate. A bracket having a support portion that contacts the lower edge and a base end portion that is rotatably supported by the bracket around a horizontal axis, and a locking claw that engages with the engagement portion of the anchor plate is formed at the tip portion. Has a hook and a central portion rotatably supported around the horizontal axis by the bracket, and a cam to which the seat belt end is connected at the base end, and the anchor plate is arranged in the seat moving direction. At the same time, the cam is attached to the rear side of the seat so as to be rotatable about a horizontal axis, and the cam and the hook press the hook by the load acting on the seat belt. The hook is arranged so that its locking claw is rotated in a direction in which the locking claw and the engaging part of the anchor plate are engaged with each other, and the locking claw and the supporting part are arranged to face each other with the anchor plate interposed therebetween. An anchor structure for seat belts for automobiles.