JPS6037616Y2 - Knob mounting structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a knob mounting structure, which is applied to a manual tuning shaft of a push button tuner, etc., and allows an operation knob to be easily and securely mounted to the manual tuning shaft (rotation shaft). The purpose is to provide.

As a conventional example of a knob mounting structure, there is one applied to a manual tuning shaft of a push button tuner, but the manual tuning shaft is usually made of a metal material, and the operating knob is usually made of a resin material.

In this case, a plurality of axial protrusions are provided on the outer periphery of the tip of the manual tuning shaft, and the tip is divided by grooves, and a plurality of axial protrusions are provided on the inner periphery of the cylindrical operating knob.

Then, the operating knob is moved around the outer periphery of the tip of the manual tuning shaft so that each protrusion on one side engages between each protrusion on the other side, and the tip of the manual tuning shaft is elastically deformed in the radial direction by the function of the groove. It was installed by fitting them together with pressure.

However, according to the above-mentioned conventional example, since the manual tuning shaft is made of metal, it is difficult to cause elastic deformation even if the groove is provided, and it is difficult to attach and detach the operating knob.
Another drawback is that if the fitting is loose, the operating knob is likely to fall off.

The present invention eliminates the above-mentioned drawbacks, and embodiments thereof will be described below with reference to the drawings.

FIG. 1 is a partially cutaway plan view of a manual tuning shaft mounting structure for a push button tuner to which an embodiment of the knob mounting structure of the present invention is applied.

In the figure, 1 is a metal frame of a push button tuner.

Reference numeral 2 denotes a metal bearing sleeve, which has a bearing hole 2a, a flange 2b, and a male thread 2c, and is inserted into the hole of the frame 1 until the flange 2b abuts, and is secured by a nut 3 screwed onto the male thread 2c. It is fixed to the frame 1 via a washer 4.

Reference numeral 5 denotes a manual tuning shaft, which is composed of a first shaft body 6 and a second shaft body 7.

The first shaft body 6 is made of metal and has an engaging shaft portion 6a having a plurality of axial protrusions on the outer periphery of one end, and a shaft portion 6b and a joint portion 8a at the other end.

The second shaft body 7 is made of resin, and has a cylindrical portion 7b having an axial recess 7a at one end as shown in FIGS. 3A and 3B.
A plurality of axial protrusions 7c are formed on the outer periphery, and the other end shaft portion 7
d has a hole 7e.

As shown in FIG. 3B, only the four protrusions 7cm square located at the positions where the entire circumference is divided into four equal parts are larger than the other protrusions 7c-2.

The procedure for assembling the first and second shaft bodies 6, 7 is to first insert the shaft body 6 with its engaging shaft portion 6a side from behind the hole 2a of the bearing sleeve 2, and then insert the shaft body 7 into its shaft portion. 7d side to the hole 2
a Insert from the front.

Then, the engagement shaft portion 6a is press-fitted into the hole 7e, and the two shafts 6 and 7 are caused to rotate integrally by the function of the protrusion on the outer periphery of the engagement shaft portion 6a.

In this way, the manual tuning shaft 5 is fully utilized, and the shaft portions 6b and 7d are aligned with the hole 2.
It is rotatably supported by a.

Reference numeral 9 designates a resin operating knob, which has a cylindrical shape with a bottom, has a plurality of axial protrusions 9a on the inner periphery, and has a tapered portion 9b at the open end of the inner periphery.

This operating knob 9 is connected to the cylindrical portion 7b of the manual tuning shaft 5.
Each protrusion 9a (or protrusion 7c) on one side is engaged between each protrusion 7c (or protrusion 9a) on the other side, and the cylindrical part 7b is thereby fitted in a diametrical direction. It is elastically deformed.

Note that the above-mentioned fitting operation is extremely easy due to the guide of the tapered portion 9a.

In this case, the four large protrusions 7C-1 first come into contact with the inner periphery of the operating knob 9, and as the guard dog-shaped protrusions 7C-1 are crushed and elastically deformed, the remaining protrusions 7cm2 are applied to the operating knob 9. It abuts on the inner periphery, and when the two 5 and 7 are fitted together, reliable abutment is maintained at least at four equal positions in the circumferential direction.

Thus, both 5 and 9 are the above-mentioned protrusions 7c. The operation knob 9 can be rotated integrally by the engagement of the knob 9a, and since the cylindrical part 7b is made of resin and easily deforms elastically, the operation knob 9 can be easily mounted and removed, and the mounting strength is also high due to the elastic force at the time of elastic deformation. be.

Reference numeral 10 denotes a pinion shaft, which has a joint portion 8b connected to the joint portion 8a (the joint portion 8 is constituted by the joint portions 8a and 8b), and its pinion portion 1.
0a is engaged with a clutch gear (not shown) of a clutch mechanism of the push button tuner.

Therefore, when the operating knob 9 is rotated, the knob 9 and the manual tuning shaft 5 are rotated together, and the pinion shaft 10 is also rotated together, so that the desired station is tuned.

As described above, according to the knob mounting structure of the present invention, in the knob mounting structure of the manual tuning shaft of a push-button tuner, the manual tuning shaft is loosely fitted into a bearing sleeve fixed to the frame of the push-button tuner. and a second shaft body made of resin, which is supported on the bearing sleeve and is attached to the first shaft body so as to be able to rotate integrally with the first shaft body. , and the second shaft has an axial recess on the distal end surface and a plurality of axial protrusions on the outer periphery of the distal end, and has a cylindrical shape with a plurality of axial protrusions on the inner periphery. While the operating knob is engaged with the outer periphery of one end of the second shaft, each protrusion on one side is engaged between each protrusion on the other side, and the one end side of the second shaft is elastically deformed in the diametrical direction. Since it is configured to be attached by being fitted with pressure, it has the following features.

■ Since the operating knob is attached to the second shaft made of resin, the second shaft easily deforms elastically in the direction of diameter reduction, making it easy to attach the operating knob, and the elastic deformation is easy. The resulting elastic force can increase the mounting strength of the operating knob.

(2) Since the second shaft body made of resin is supported on the bearing sleeve, there is no need to lubricate this part, which is convenient in terms of manufacturing and maintenance.

(2) The first shaft body is simply fitted loosely into the bearing sleeve, and the diameter and other dimensions are not required to be exact, making it easier to process and assemble.

Further, the first shaft body can be stably supported within the bearing sleeve and rotated by the action of the second shaft body.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of a manual tuning shaft mounting structure for a push button tuner to which an embodiment of the knob mounting structure of the present invention is applied, and Fig. 2 A and B are longitudinal cross-sections of the operating knob of the above mounting structure, respectively. A side view and a front view, and FIGS. 3A and 3B are a longitudinal sectional side view and a front view, respectively, of the main part of the rotating shaft of the above-mentioned mounting structure. 2...Sleeve shaft, 5...Manual tuning shaft, 6...First shaft body, 7...Second shaft body, 7a... ...Concave part, 7b...Cylindrical part,
7c...7c 1?7C2?9a...
・Protrusion, 9... Operation knob.

Claims (1)

[Scope of utility model registration request] In the knob mounting structure of the manual tuning shaft of the push button tuner,
The manual tuning shaft includes a first shaft loosely fitted in a bearing sleeve fixed to the frame of the push button tuner, and a first shaft that is supported on the bearing sleeve and integrally attached to the first shaft. The second shaft body is made of a resin and is attached so as to be able to rotate freely. The cylindrical operation knob has a plurality of axial protrusions on the inner periphery, and is connected to the outer periphery of one end of the second shaft between each protrusion on one side and between each protrusion on the other side. A knob mounting structure configured to be mounted by being engaged with the second shaft body and being pressed and fitted while elastically deforming one end side of the second shaft body in a diametrical direction.