JPH09201246A - Member for linking left and right of seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve inconvenience of linking by means of welding by fixing a link to both end parts of a pipe without performing welding. SOLUTION: In this member for linking the left and right of a seat for a vehicle, the link 21 is orthogonally crossed and connected to both end parts of the pipe 20 in a prescribed length with torsional rigidity. Then, the link 21 for which a circular hole with a flange is formed is inserted to the pipe 20, the link 21 is held therebetween and fixed so as not to be moved in an axial direction by a flange part 24 formed by bulging work and projection parts 23 for which the diameter of an end part is enlarged and the plural projection parts 23 are formed so as to gnaw into the circular hole in a radial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a left-right interlocking member for a vehicle seat, and particularly to improve the product quality.

[0002]

2. Description of the Related Art As is well known, in order to ensure an optimal driving posture, a vehicle seat has a reclining device which allows the seat back to adjust to a desired inclination angle. A structure that can be rotated and can be held at a desired angle is adopted.

For example, as shown in FIG. 4, an arm 5 is connected to a base plate 2 fixed to a seat cushion 1 so as to be pivotally attached via a center shaft 3 to which an arm 5 is connected. 6 is fixed, a tooth portion located on the circumference of a predetermined radius around the center shaft 3 is formed on the upper part 4, and a lower tooth member 7 engaging and disengaging with the tooth portion is provided on the base plate 2
A cam member 8 pivotally supported on the base plate 2 is pivotally supported on the base plate 2 so as to rotate integrally with the operation lever 9.

In order to interlock the left and right reclining devices, a pin 10 is projected on a cam member 8 which rotates integrally with the operating lever 9, and the pin 10 is inserted into an elongated hole 11 formed in the base plate 2. , A link pipe 13 having a U-shaped end portion with which the pin 10 engages is fixed to both ends by welding so that both ends are rotatably fitted to the center shaft 3 and the left and right reclining devices 14, It is interposed between 14.

In order to transmit the rotational movement of the connecting pipe 13, as shown in FIG. 5, both ends of a pipe material having torsional rigidity are inserted into a circular hole 15 formed at the base end of the link 12 and orthogonal to each other. In general, the welding 16 is integrated to enable torque transmission.

Such a connecting pipe 13 is used not only in a seat reclining device but also in a seat lifter device for holding a seat cushion so that it can be raised and lowered.

[0007]

However, according to the conventional technique, when the link 12 is welded to the connecting pipe 13, the strength is lowered by the welding heat, and the quality is lowered due to thermal strain or spatter generated during welding. There's a problem.

Therefore, the present invention is intended to solve the inconvenience caused by welding by fixing the links to both ends of the pipe without welding.

[0009]

A left and right interlocking member for a vehicle seat according to the present invention is a left and right vehicle seat in which links are orthogonally connected to both ends of a pipe having a predetermined length having torsional rigidity. In the interlocking member, a link having a circular hole with a flange is inserted into the pipe, and the link is axially immovably clamped and fixed by a flange portion formed by bulging and a projecting portion having an enlarged end portion. In addition, a plurality of protrusions are formed so as to bite into the circular hole in the radial direction.

With the above structure, the link is clamped and fixed by the collar and the protrusion, the axial movement of the connecting pipe is prevented, and the connecting pipe and the link are formed by the protrusion formed so as to bite into the circular hole. Are integrated so that torque can be transmitted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. In the connecting pipe 20 shown in FIG. 1, links 21 are fixed to both ends of a pipe material having a predetermined length so as to be orthogonal to each other by bulging. To integrate the connecting pipe 20 and the link 21,
A circular hole 22 (see FIG. 2) with a flange is formed in the link 21, and the connecting pipe 2 inserted through the circular hole 22.
For example, four points of the circumferential portion of 0 are enlarged to form the protruding portion 23 that protrudes in the radial direction of the circular hole 22 and bites in an arc shape.

The projecting portion 23 is formed so as to expand the flange portion of the circular hole 22 together with the end portion of the connecting pipe 20, and the flange portion 24 and the projecting portion 23 formed by expanding the connecting pipe 20 are The link 21 is formed so as to sandwich it so that the link 21 cannot move in the axial direction of the connecting pipe 20. Both ends of the connecting pipe 20 are rotatably fitted to the center shafts 27 (corresponding to 3 in FIG. 4) of the left and right reclining devices 26. The link 21 may be an offset-shaped link 21a.

The manufacturing process of such a connecting pipe 20 will be described. As shown in FIG. 2, the connecting pipe 20 is inserted into the processing hole 31 of the bulge processing table 30, and both ends thereof are slightly separated from the processing hole 31. The flanged circular holes 22 of the links 21 are fitted to their ends so as to project, and the die heads 32 are inserted into both ends of the connecting pipe 20, and the liquid is compressed into the connecting pipe 20 by a normal bulging process. Four
0 is injected and the die heads 32 are pressed toward each other toward the processing table 30 by a press in the axial direction.

As shown in FIG. 2, the die head 32 is provided with protrusions 33 protruding in the radial direction at equal intervals on the circumference of the base of the cylindrical head to be inserted into the connecting pipe 20. Although an example in which four protrusions 33 are formed is shown, the number may be two or more.

As a result, as shown in FIG. 3, both ends of the connecting pipe 20 are crushed and squeezed with the link 21 sandwiched therebetween, and the collar portion 24 on the working table 30 side and the projecting portion 2 on the die head 32 side.
3 are respectively formed, and the link 21 is pinched and fixed so as not to move in the axial direction.

Thus, according to the above-described embodiment, the link pipe is crushed by the bulge process in the axial direction to form the flange portion 24 having a large diameter and the protruding portion 23 having an enlarged end portion to form a link. A circular hole 22 of the link 21 is formed by sandwiching the protrusion 23 of the die head 32 in a radial direction while sandwiching the protrusion 23 so as to be immovable in the axial direction.
By forming so as to bite into, it is possible to transmit the rotational movement of the link to the connecting pipe, and therefore, because no welding is performed, the strength of the connecting pipe, etc. does not decrease, and thermal strain occurs. There is no fear that the quality will deteriorate.

[0017]

As described above, according to the present invention, since welding is not used at all, the quality is improved, and the joint portion of the link and the connecting pipe can be improved in strength by work hardening and can be pressed. Productivity can be improved and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view (A) and an AA sectional view (B) of a main part showing an embodiment of the present invention.

FIG. 2 is a schematic explanatory view of a manufacturing process.

FIG. 3 is a schematic explanatory diagram of a manufacturing process.

FIG. 4 is a perspective view of a main part of the seat reclining device.

FIG. 5 is a front view (A) and a cross-sectional view (B) taken along the line BB of the main part showing a conventional connecting pipe.

[Explanation of symbols]

 20 ... Connection pipe 22 ... Flanged circular hole 23 ... Projection part 24 ... Collar part 32 ... Die head 33 ... Projection part

Claims (1)

[Claims] 1. A left-right interlocking member of a vehicle seat, wherein links are orthogonally coupled to both ends of a pipe having a predetermined length having torsional rigidity, and a link having a circular hole with a flange is formed in the pipe. The link is sandwiched between the flange portion formed by bulging and the protruding portion whose diameter is enlarged so as to be immovable in the axial direction, and a plurality of protruding portions are formed so as to bite into the circular hole in the radial direction. A left-right interlocking member for a vehicle seat, which is characterized in that