JPH0532655Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is mainly used for operating tools for various movable devices installed in automobiles, such as lumbar support handles, headrest swing handles, and wind regulators. The present invention relates to a shaft and operating tool fixing device for fixing a synthetic resin operating tool such as a handle for a rotor to the end of a shaft for transmitting operating force so that both rotate together.

[Conventional technology]

FIG. 6 shows the structure of this type of conventional fixing device for a shaft and an operating tool. In the figure, 1 is a cylindrical shaft that is rotatable around its axis, Although omitted, an operation transmission member such as a cam is fixed. Reference numeral 2 designates an operating tool made of synthetic resin, which has a dial shape and has a cylindrical boss portion 2A having an inner diameter approximately equal to the outer diameter of the shaft 1, which is integrally molded at the center of the axis thereof, projecting to one side. , cap locking through holes 2B are provided at three locations on the outer circumferential side of this cylindrical boss portion 2A.
is formed.

Reference numeral 3 denotes a metal detent member, which is inserted into the bottom of the cylindrical boss portion 2A of the operating tool 2, and the shaft hole 3A of the detent member 3 is formed in a non-circular shape such as an oval shape. The distal end portion 1A of the shaft 1 is fitted into the shaft hole 3A in a non-rotating manner, and the operating tool 2 is fixed by a countersunk screw body 4 screwed into the shaft 1.

In order to cover the countersunk screw body 4, a cap 5 is attached to the operating tool 2 by locking a protruding locking protrusion 5a into the through hole 2B.

However, according to the above structure, since the operating tool 2, the rotation prevention member 3, and the countersunk screw body 4 are provided, the number of parts increases accordingly, and the assembly work is troublesome and time-consuming.

Therefore, as an example of means for improving the above-mentioned problem, a mounting device having a structure as described in Japanese Utility Model Application Publication No. 59-122613 has been proposed.

As shown in FIGS. 7 and 8, this mounting device forms a rectangular storage hole 2C at the back of the cylindrical boss portion 2A of the operating tool 2, and also forms a rectangular storage hole 2C on the inner peripheral tip side of the cylindrical boss portion 2A. A ring-shaped blocking frame 2D is formed therein. On the other hand, a U-shaped locking member 7 is formed separately from the operating tool 2. This locking member 7 has a bottom plate portion 7A and wide portions 7B on both sides thereof, and bends the tips of these wide portions 7B outward to form a locking portion 7a.
A blocking pawl 7b for preventing slipping off is formed by cutting and raising it inwardly from the bottom plate portion 7A.

By the way, although it is possible to improve the mounting structure of the operating tool 2 and the appearance of the mounting portion according to the mounting device having the above configuration, the storage hole 2C formed at the back of the cylindrical boss portion 2A cannot be reinforced in any way. Not even done. Therefore, it cannot withstand large operating loads. Further, it is necessary to form a ring-shaped blocking frame 2D on the inner periphery of the cylindrical boss portion 2A, which requires more time and effort in the molding process.Furthermore, the structure of the locking member 4 is complicated, and The stop member 4 must first be assembled to the shaft 1 and then inserted into the cylindrical boss portion 2A, which poses problems such as the assembly work being difficult and time consuming.

[Problem to be solved by the invention] This invention was made to improve the above-mentioned problems. It simplifies the configuration by reducing the number of parts, makes assembly work easier, and is sufficiently resistant to large operating loads. It is an object of the present invention to provide a fixing device for a shaft and an operating tool that can endure and enable strong rotational transmission.

[Means to solve the problem]

A fixing device for a shaft and an operating tool according to this invention includes a cylindrical shaft having a planar contact surface and an annular locking groove formed in the vicinity of the contact surface on the outer circumferential surface of the tip, and the shaft. The operating tool has a cylindrical boss portion into which the tip portion is removably fitted, and a fixing member in which a rotation prevention portion and a removal prevention portion are formed by bending a single wire, and the above-mentioned The anti-rotation portion of the fixing member is integrally inserted into the cylindrical boss portion of the operating tool when it is molded, and is supported at both ends so that the intermediate portion is exposed inside the cylindrical boss portion. The retaining portion of the fixing member has a length that protrudes outward beyond the cylindrical boss portion, and by fitting the shaft to the cylindrical boss portion, the retaining portion is locked to the abutting surface of the shaft and is prevented from being pulled out. The stop portion is configured to be elastically and detachably locked in the locking groove of the shaft.

[Effect]

According to the above structure, since the tip of the shaft is removably fitted into the bottomed cylindrical boss, it is not necessary to attach a cap as in the conventional case. Therefore, the number of parts is reduced accordingly.

Furthermore, the rotation preventing portion of the fixing member is integrally inserted into the cylindrical boss portion of the operating tool when it is molded, and is supported on both sides so that the intermediate portion is exposed inside the cylindrical boss portion. This makes it possible to securely lock onto the planar contact surface of the shaft, enabling strong rotational transmission, and by inserting the fixing member into the cylindrical boss part as an integral part, assembly is facilitated. The number of parts required during assembly is reduced, making assembly work much easier.

Further, since the fixing member has the rotation preventing portion and the slipping preventing portion formed by bending a single wire, the structure of the fixing member itself is extremely simple and easy to manufacture.

〔Example〕

An embodiment of this invention will be described below based on the drawings.

FIG. 1 shows the structure of a shaft and operating tool fixing device according to an embodiment of this invention.

In the figure, 1 is a cylindrical shaft;
On the outer circumferential surface of the tip 1A, opposing parts in the diametrical direction are cut to form mutually parallel planar abutment surfaces 1a, 1a, and the areas close to the abutment surfaces 1a, 1a are Annular locking groove 1c
is formed.

Reference numeral 2 denotes a dial-shaped operating tool made of synthetic resin, and a cylindrical boss portion 2A having an inner diameter approximately equal to the outer diameter of the shaft 1 is integrally molded at the center of the axis thereof and projects to one side. .

Reference numeral 6 denotes a fixing member made by bending a single metal wire into a rectangular plane and a substantially dogleg shape on the sides.As shown in FIG.
It is integrally inserted near the bottom of the cylindrical boss portion 2A of the operating tool 2.

The fixing member 6 is formed with a detent portion 6A that abuts the contact surfaces 1a, 1a and has two wire portions that cross in parallel with each other within the shaft hole 2E of the cylindrical boss portion 2A, Having a wire portion that protrudes laterally beyond the opening end surface of the cylindrical boss portion 2A,
A retaining portion 6B that elastically engages with the retaining groove 1c of the shaft 1 is formed.

Next, a procedure for assembling the device having the above configuration will be explained.

First, when the operating tool is pushed toward the tip of the shaft 1 or against the cylindrical boss portion 2A of the operating tool 2, the retaining portion 6B of the fixing member 6 resists the elastic force and is pushed around. The tip 1A of the shaft 1 enters the cylindrical boss portion 2A while being displaced in the direction of the arrow a in FIG.
By abutting the wire portion of the book, rotation of the shaft 1 and the operating tool 2 is prevented. At almost the same time, the retaining portion 6B is displaced in the direction of arrow b in FIG. 1 due to the elastic restoring force, and the shaft 1
As a result, the shaft 1 and the operating tool 2 are prevented from coming off, and the assembled and fixed state shown in FIG. 3 is obtained.

In this assembled and fixed state, the shaft 1 can be rotated by hand by turning the operating tool 2.
For example, the lumbar support can be operated by rotating the lumbar support.

That is, according to the above structure, since the distal end portion 1A of the shaft 1 is removably fitted into the bottomed cylindrical boss portion 2A, it is not necessary to attach the cap 5 as in the conventional case. Therefore, the number of parts is reduced accordingly.

Further, the detent portion 6A of the fixing member 6 is integrally inserted into the cylindrical boss portion 2A during molding of the operating tool 2, and is supported on both sides so that the intermediate portion is exposed inside the cylindrical boss portion 2A. Since the fixing member 6 is supported in the cylindrical boss portion 2A, it is firmly engaged with the planar contact surfaces 1a, 1a of the shaft 1, making it possible to transmit strong rotation.
By inserting it into a single piece, the number of parts during assembly can be reduced and the assembly work can be facilitated.

Further, the fixing member 6 is formed by bending a single metal wire to form a rotation prevention portion 6A and a removal prevention portion 6.
Since B is formed, the structure of the fixing member 6 is extremely simple and manufacturing is also easy.

FIG. 4 shows another embodiment, in which both end portions of a rectangular wire in the long side direction are bent in the same direction so that the ends approach each other, so that the shaft 1 is attached to the fixing member 6. Two retaining portions 6B, 6B are formed to elastically engage at two locations in the diametrical direction of the annular retaining groove 1c.

According to this other embodiment, the effect of preventing the shaft 1 and the operating tool 2 from coming off can be further enhanced compared to the case of the above embodiment.

FIG. 5 shows still another embodiment, in which a contact surface 1a is formed by cutting one side on the outer circumferential surface of the tip end 1A of the shaft 1, and a rotation preventing portion 6A on the fixed member 6 side is formed. It is formed with only one wire rod portion that crosses the inside of the shaft hole 2E of the cylindrical boss portion 2A.

Note that the operating tool 2 is not limited to a dial-shaped one, but may be a knob-shaped one.

[Effect of idea]

As described above, according to this invention, it is possible to have a simple structure with a small number of parts, and thereby the assembly work can be made very easy. Moreover, the anti-rotation part of the fixing member is integrally inserted into the cylindrical boss part of the operating tool, and the cylindrical boss part is reinforced, so it can withstand large operating loads and provides powerful rotational transmission. It can be made possible.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a shaft and operating tool fixing device according to an embodiment of the invention before assembly, Fig. 2 is a perspective view of the same, Fig. 3 is a longitudinal cross-sectional view of the device in an assembled and fixed state; Fig. 4 is a vertical cross-sectional view of the main part in an assembled and fixed state showing another embodiment, Fig. 5 is an exploded perspective view before assembly showing yet another embodiment, and Figs. 6 to 8 show a conventional example. 6 is a longitudinal sectional view of the assembled and fixed state, FIG. 7 is an exploded perspective view before assembly, and FIG. 8 is a longitudinal sectional view of the main part of FIG. 7. 1...Shaft, 1A...Shaft tip, 1
a...Abutment surface, 1c...Annular locking groove, 2...Operation tool, 2A...Cylindrical boss portion, 2E...Shaft hole of cylindrical boss portion, 6...Fixing member, 6A...Rotation stopper Part, 6
B... Retaining part. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A cylindrical shaft with a planar contact surface and an annular locking groove formed close to the contact surface on the outer peripheral surface of the tip, and a cylindrical shaft into which the tip of the shaft is removably fitted. The device includes an operating tool having a boss portion, and a fixing member in which a rotation prevention portion and a removal prevention portion are formed by bending a single wire, and the rotation prevention portion of the fixing member is formed during molding of the operation tool. The fixing member is integrally inserted into the cylindrical boss portion and supported on both sides with the intermediate portion exposed inside the cylindrical boss portion, and the retaining portion of the fixing member is inserted from the cylindrical boss portion By fitting the shaft into the cylindrical boss portion, the detent portion is retained on the abutting surface of the shaft, and the retaining portion is elastically engaged with the retaining groove of the shaft. A fixing device for a shaft and an operating tool, characterized in that it is configured to be removably locked.