JPS622664Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a mounting device for a double-shaft knob, which is used, for example, when mounting knobs for stereo volume (volume) and volume left/right ratio adjustment (balance) concentrically. .

FIG. 1 is a sectional view of a conventional device, and 10 is a first axis of a volume or the like. Reference numeral 11 denotes a second shaft such as a balance shaft, which is inserted through the outside of the first shaft 10 and has a hollow cylindrical shape, and its tip 12 is shorter than the tip of the first shaft 10 by a predetermined amount. Both tips 12, 13
A serration 14 having a triangular cross section and extending parallel to the axial direction of the shafts 11 and 10 is formed on the outer periphery of the shaft. A concave groove 15 is formed on the outer circumference of the shaft 11 at the inner end of the serration 14. This groove 15
has the same depth as serration 14 or a little greater depth.

16 is a first knob, which is located at the tip 1 of the first shaft 10;
A fitting cylinder part 18 having a hole 17 that can be fitted into a hole 17 is provided at the center, and a knob part 19 protruding from the fitting cylinder part 18 is provided on the outer periphery. The fitting cylinder part 18 and the knob part 19 are concentric. The first knob 16 is composed of a metal outer body 20 made of aluminum or the like, and an inner body 21 made of a synthetic resin such as ABS fitted inside the outer body 20.

A serration 14 into which the tip 13 of the first shaft 10 can be inserted and fitted is formed in the hole 17 from the entrance to a predetermined position in the middle, and the back end of the serration has a step that limits the insertion amount of the tip 13. A portion 22 is formed. This stepped portion 22 is formed by enlarging the entrance side of the hole 17 by the depth of the serrations 14.

23 is a second knob, which is attached to the tip 1 of the second shaft 11.
A fitting cylinder part 25 having a hole 24 that can be fitted into the fitting cylinder part 25 is provided at the center, and a knob part 26 protruding from the fitting cylinder part 25 is provided on the outer periphery.
It is equipped with A serration 14 is formed in the hole 24 of the fitting cylindrical portion 25 and is capable of being inserted and fitted into the tip end 12 of the second shaft 11 . The second knob 23 is
Like the first knob, it is composed of a metal outer body 28 made of aluminum or the like, and an inner body 29 made of ABS or the like fitted inside the metal outer body 28.

A cover 30 has a hole 31 through which the shafts 10 and 11 are inserted.

According to such a conventional device, when the first knob 16 and the second knob 23 are fitted to the tips 13 and 12 of the first shaft 10 and the second shaft 11, the first knob 16 is located at the second position by fitting the distal end surface 32 of the first shaft 10 into the stepped portion 22 of the first knob 16.
The position of the knob 23 is on the surface 2 of the groove 15 of the second shaft 11.
7, the tip surface 35 of the fitting cylinder portion 25 of the second knob 23
Since the gap C between the first knob 16 and the second knob 23 is determined by the collision between the two, the gap C between the first knob 16 and the second knob 23 varies due to manufacturing errors, which has the disadvantage of impairing marketability. In order to reduce this variation, it is necessary to increase the accuracy, which has the disadvantage of increasing the price.

For this purpose, conventionally, a first knob 16 and a second knob 2 are used.
3 is provided with a protrusion that abuts against the other side, and a synthetic resin film is interposed between the protrusion and the other abutting surface.
Disclosed in the 63156 local gazette.

However, according to this known example, a synthetic resin film is required to reduce the coefficient of friction caused by the collision between the first knob 16 and the second knob 23, which increases the number of parts and assembly man-hours, making it expensive. The point was hot.

This proposal was proposed in view of the above points, and by making only slight changes to the first knob 16 and the second knob 23, the gap C can be made constant, and the number of parts and assembly man-hours will increase. The aim is to provide it at a low price without any hassle.

In this case, the fitting cylinder part 18 of the first knob 16 is formed of synthetic resin and is not coated with metal;
Fitting cylinder part 1 of the first knob 16 in the knob 23
The part facing 8 is covered with the first knob 16, and there is no need to apply metal for decoration, and the synthetic resin can be used as is. By abutting them, the gap is reduced. The structure is such that C is limited to a certain level and the coefficient of friction is reduced by utilizing the lubricity of the synthetic resin.

Figure 2 is a sectional view of the device according to the first embodiment of the present invention.
The same parts as those in the figures are given the same reference numerals, and the explanation will be omitted. The difference is that a cylindrical projection 34 is formed on the upper center surface of the second knob 23. This cylindrical protrusion 34 has a second knob 23 fitted to the tip end 12 of the second shaft 11, and a second knob 23 that fits into the cylindrical portion 2 of the second knob 23.
5 is the surface 27 of the groove 15 of the second shaft 11.
After the first knob 16 is fitted to the first shaft 10
When the first knob 16 is fitted to the distal end 13 of the fitting cylinder part 18, the distal end surface 36 of the fitting cylinder part 18 of the first knob 16 abuts against each other, whereby the first knob 16 and the second knob 2
This is to keep the gap C with respect to 3 constant.

This cylindrical projection 34 is provided on the second knob 23 in the case of FIG.
A similar effect can be expected even if it is provided at 8 and abuts against the inner body 29 of the second knob 23.

In the case of FIG. 2, the fitting cylinder portion 18 of the first knob 16
In the hole 17 formed in the step part 22 of FIG.
The equivalent is unnecessary and will be deleted.

As described above, according to the present invention, the fitting cylinder portion 18 of the first knob 16 is abutted against the second knob 23, thereby determining the gap C between the first knob 16 and the second knob 23. Therefore, the manufacturing error of the shafts 10 and 11 is due to the gap C
This method has no effect on the product, and the variation is reduced compared to the conventional method. Further, a simple improvement such as forming the protrusion 34 is sufficient, and it has the effect of being able to be provided at a low cost.

Furthermore, the fitting cylinder part 18 of the first knob 16 is made of synthetic resin, and since the second knob part with which the fitting cylinder part 18 abuts is covered with the first knob 16, it is not made of metal for decoration. can be removed, and the synthetic resin can be used as is. Therefore, the butting relationship can be made of synthetic resin, and the lubricity of synthetic resin can be used to create parts that move smoothly and have a small coefficient of friction. It has the effect of being able to be provided at low cost without increasing the number of parts or assembly man-hours.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional device, and Fig. 2 is a sectional view of an embodiment of the present invention. In Figs. 1 and 2, the first axis and the second axis are along the center line A-A. The left side shows a cross section, while the right side shows a non-cross section. 10 is the first axis, 11 is the second axis, 18, 25
19 and 26 are knob portions, 20 and 28 are outer bodies made of metal, and C is a gap.

Claims (1)

[Scope of utility model registration request] a second shaft that is rotatably inserted concentrically and relatively to the first shaft outside the first shaft and is shorter than the first shaft by a predetermined amount; 1
A fitting cylinder part having a hole to be fitted into the tip of the shaft and a knob protruding to the outside of the fitting cylinder part are integrally formed of synthetic resin, and the knob is adhered to the surface of the knob part. a first knob having an outer body made of metal; a fitting tube portion having a hole to be fitted into the tip end of the second shaft; and a knob projecting on the outer periphery of the fitting tube portion. A second knob integrally formed of synthetic resin and comprising an outer body made of metal and coated on the surface of the knob except for the portion facing the fitting cylinder part of the first knob. When the fitting cylinder part of the first knob is fitted to the tip part of the first shaft, the fitting cylinder part of the second knob fits to the tip part of the second shaft. A biaxial knob attachment device, characterized in that the device is abutted against a portion of the synthetic resin that is not coated with the knob, and a predetermined gap is formed between the knob portion of the first knob and the second knob portion. .