JPS639771Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a structure for preventing the pivot from coming off, and more specifically, the invention applies a restoring action to the pivot that pivots a movable member that requires rotational operation, such as an operating lever, to a support piece. In order to do this, a torsion coil spring is wound around the shaft, and the structure prevents the pivot from coming off.

For example, in an operating lever for locking the seat bottom of an automobile seat, as shown in FIG. The torsion coil spring 3, the operating lever 2, the support piece, and the other side wall 1b are penetrated from the side wall 1a, and then an engagement groove 4 is carved in the circumferential surface of the pivot shaft 4 located inside the support piece 1.
Fit the retaining ring 10 into the shaft 4
We are trying to prevent this from falling out. However, axis 4
is inserted into the support piece 1, the pivot engagement groove 4
The work of fitting the retaining ring 10 into a is as follows:
It is very troublesome, and since a retaining ring is required, there are many parts to be assembled, which requires time and effort to manage, and has the disadvantage of increasing costs.

This invention aims to solve the above-mentioned conventional drawbacks, and by engaging a torsion coil spring with the engagement groove of the pivot shaft, the pivot shaft is prevented from coming off, and the assembly is easy and the number of parts is reduced. The present invention provides a structure for preventing a pivot from coming off, which is characterized by a reduced amount of the shaft.

Hereinafter, this invention will be explained in detail with reference to embodiments shown in FIG. 2 and subsequent figures.

In the first embodiment shown in FIGS. 2 to 5,
5 is a support piece, 6 is a control lever for a movable member, 7 is a pivot, and 8 is a torsion coil spring.

The supporting piece 5 has a concave cross-sectional surface and is attached to an upper wall 5a of a seat bottom frame (not shown) of an automobile seat.
is fixed and protrudes downward,
Pivot mounting holes 5d and 5 are provided opposite to both side walls 5b and 5c.
E is drilled. The operating lever 6 is approximately L-shaped, has a knob 9 attached to one end, a locking hook 6a at the other end, and a pivot through hole 6 at the bent part.
b is bored, and a protrusion 6d bent laterally is provided on the upper surface of the knob mounting side, and the tip of the torsion coil spring 8 is locked on the lower surface of the protrusion 6d. As shown in FIG. 3, the pivot 7 consists of a head 7a having a larger diameter than the mounting holes 5d and 5e of the support piece 1, and a small diameter shaft portion 7b that just fits into the mounting holes 5d and 5e. One engagement groove 7c is carved along the outer circumferential surface of the portion 7b at a position near the head. The torsion coil spring 8 has one end protruding to one side from the annularly wound central winding part 8c to provide a locking part 8a with the movable member, while the other end is bent inward and engaged with the pivot shaft. An engaging portion 8b that engages with the groove is provided.

Next, the method of assembling each of the above members will be explained.
First, the bent portion of the operating lever 6 is inserted between the side walls 5b and 5c of the support piece 1, and the torsion coil spring 8 is inserted in a free state. Next, Axis 7
is passed through the mounting hole 5d of the one side wall 5b, and inserted into the winding portion 8c of the torsion coil spring 8 in a free state as shown by the chain line in FIG. At this time, since the engaging portion 8b is bent inward, the engaging portion 8b is pushed open and the pivot shaft 7 is inserted. Next, pass the support piece through the through hole 6b of the operating lever 6, and insert the support piece into the other side wall 5c.
The head 7a is inserted into the mounting hole 5e of the side wall 5b.
to be secured to the outer surface of the Next, as shown in FIG. 4, the protruding locking portion 8a of the spring 8 is pushed down to lock its tip to the protrusion 6d of the operating lever 6. The tip of the inwardly bent engaging portion 8b at the other end of the torsion coil spring 8 is connected to the upper wall 5a of the support piece 5.
Therefore, when the locking portion 8a is pushed down and locked to the protrusion 6d, a pressing force is applied to the torsion coil spring 8, so that the locking portion 8b fits into the locking groove 7c of the pivot shaft 7. engage.

As described above, since the torsion coil spring 8 engages with the engagement groove 7c of the pivot shaft 7, the pivot shaft 7 cannot be detached from the support piece 5, and is securely prevented from coming off. In addition, since the operating lever 6 is engaged with the torsion coil spring 8, the biasing force of the torsion coil spring 8 acts on the operating lever 6, causing the operating lever to perform a restoring action.

On the other hand, when releasing the above-described assembly, when the locking part 8a of the torsion coil spring 8 and the protrusion 6d of the operating lever 6 are released, the engaging part 8b comes off from the engagement groove 7c of the pivot shaft, and the pivot 7 can be extracted.

As is clear from the above explanation, according to this invention, an engagement groove is formed in the pivot shaft, and one end of the torsion coil spring is engaged with the engagement groove, thereby reliably preventing the pivot shaft from coming off. can. In addition, by simply inserting the pivot shaft with the movable member and torsion coil spring inserted into the support piece, and then locking one end of the torsion coil spring to the movable member, the torsion coil spring will engage with the engagement groove of the pivot shaft. Therefore, assembly is extremely easy. In addition, since the conventional retaining ring is not required, it has various effects such as being able to reduce costs.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a conventional example, Fig. 2 is a side sectional view, and Fig. 3 is a sectional view taken along the line X-X. Fig. 3 is a perspective view of the pivot.
Figure 5 is a drawing showing the assembly method, and Fig. 5 is a perspective view showing the engaged state of the pivot and the torsion coil spring. 5...Support piece, 6...Operation lever, 6d...Protrusion, 7...Pivot, 7c...Engagement groove, 8...Torsion coil spring.

Claims (1)

[Claims for Utility Model Registration] Pivot mounting holes 5 with concave cross-section facing both side walls.
The supporting piece 5 has holes d and 5e, and is approximately L-shaped, and has a pivot hole 6b in the bent part, and a protrusion 6d for spring engagement on one side.
an operating lever 6 which is a movable member provided with a head 7a having a larger diameter than the pivot mounting holes 5d and 5e.
and a small-diameter shaft portion 7b that fits into the shaft mounting holes 5d and 5e, the shaft portion 7b having an engagement groove 7c carved along its outer circumferential surface, and a central portion wound in an annular shape. One end protrudes to one side from the winding part 8c to provide a locking part 8a for engaging the movable member, and the other end is bent inward to engage the pivot engagement groove 7c. After inserting the bent part of the operating lever 6 and the coil spring 8 into the support piece 5, insert the pivot 7 into the pivot mounting hole of the operating lever 6 through one of the pivot mounting holes of the support piece 5. Pass through the through hole and the coil spring 8 into the other pivot mounting hole, push down the locking part 8a at one end of the coil spring 8, and release the protrusion 6 of the operating lever 6.
d, the engagement portion 8b at the other end is pushed down and engaged with the engagement groove 7c of the pivot 7.