JPS6220009Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting device for a rotating shaft such as a rotating knob.

For example, the rotary knob on conventional radio receivers, etc.
It is supported by a rotating shaft that is immovably supported on the chassis and a rotating shaft of a variable electric quantity element such as a volume or switch that is attached to a printed circuit board, and is loosely fitted into an insertion hole provided in the cabinet. It was just sitting there. As a result, the knobs are wobbly and have a poor operational feel, and are also misaligned with respect to the cabinet, resulting in an unsightly appearance. Furthermore, in order to make such a rotary knob waterproof (drip-proof), separate parts such as rubber gaskets and O-rings are required, which increases the number of assembly steps and increases costs.

The present invention was developed in view of these problems, and aims to provide a rotating shaft mounting device that does not rattle or shift relative to the cabinet, and can easily be constructed to be waterproof. be.

The present invention will be described below with reference to embodiments and drawings.

As shown in Figure 1, in this example, ABS
An operating knob 1 made of synthetic resin such as resin is fitted into an insertion hole 3 of a cabinet 2 made of similar synthetic resin and is rotatably supported. That is, the operating knob 1 is integrally provided with a shaft-like projection 4 at its center, and this shaft-like projection 4 fits into a cylindrical projection 5 that is integrally provided in the insertion hole 3 of the cabinet 2. The operating knob 1 is attached. At this time, the play between the outer circumferential surface 6 of the shaft-like projection 4 and the inner circumferential surface 7 of the cylindrical projection 5 is approximately 0.01 to 0.05 mm at most, so that the operating knob 1 can be moved into the cabinet without wobbling. It is held at 2. A lubricant such as grease 8 is disposed between the outer circumferential surface 6 of these shaft-shaped projections 4 and the inner circumferential surface 7 of the cylindrical projection 5, thereby smoothing the rotation of the operating knob 1. At the same time, a waterproof effect is added between them. Reference numeral 9 denotes a recessed portion provided at the tip of the cylindrical projection 5 for storing grease.

The operating part 10 of the operating knob 1 is configured in a cap shape as shown in the figure, and the fitting part between the operating knob 1 and the cylindrical projection 5 is almost completely covered by this operating part 10. It's summery. This prevents rain or the like from directly hitting the fitting portion. Further, in this example, since the cylindrical projection 5 is provided in the insertion hole 3 of the cabinet 2, it is possible to more reliably prevent water from entering the fitting portion.

The shaft-like protrusion 4 of the operating knob 1 is provided with an insertion recess 11 at its center, and the tip 13 of the rotating shaft member 12 made of a low-friction material such as polyacetal resin is inserted into the insertion recess 11. has been done. At this time, as shown in FIG. 3, a serration 14 is formed on the inner peripheral surface of the insertion recess 11.
Approximately 120 mm is attached to the outer peripheral surface of the tip 13 of the rotating shaft member 12.
Three protrusions 15 integrally formed at .degree. intervals engage with the serrations 14, so that the operating knob 1 and the rotating shaft member 12 are non-rotatably coupled to each other.

As clearly shown in FIG. 2, the rotating shaft member 12 is
It is rotatably supported by a cylindrical shaft support 18 integrally formed with a chassis 16 made of synthetic resin such as ABS resin via an elastic piece 17. The elastic piece 17 has a cross-sectional shape that is bent like a crank relative to the chassis 16, so that it can be elastically deformed in the directions of arrows A and B, respectively.

The rotating shaft member 12 is inserted into the insertion hole 19 of the shaft support 18 from above, and an annular protrusion 20 integrally provided on the outer peripheral surface of the rotary shaft member 12 is inserted into the shaft support 18 from above.
8 and is held by the upper end surface of the rotating shaft member 12, and is prevented from coming off by an E ring 21 attached to the lower end of the rotating shaft member 12. A printed circuit board 23 is provided in the center through hole 22 of the rotating shaft member 12.
The operating elements 25 of the rotary electric quantity variable element 24, such as a volume, are press-fitted and are attached to each other in a non-rotatable manner.

The device shown in FIG. 1 is assembled in the following steps. First, the rotating shaft member 12 is attached and fixed to the elastic piece 17 of the chassis 16. Next, the printed circuit board 23 to which the rotary variable electric quantity element 24 and the like are attached is attached to the chassis 16, and the operator 25 of the rotary variable electric quantity element 24 is connected to the rotating shaft attached to the elastic piece 17 of the chassis 16. It is press-fitted into the central through hole 22 of the member 12 from below. At this time, as is generally done, the printed circuit board 23 is attached so as to be able to move slightly laterally with respect to the chassis 16, so that the operator 25 of the rotary variable electric quantity element 24 passes through the center of the rotating shaft member 12. Accurate alignment with the hole 22 can be achieved. Furthermore, even if the printed circuit board 23 is immovably fixed to the chassis 16 with screws or the like, each electrical quantity variable element 24 soldered to the printed circuit board 23
can be displaced to some extent by its legs, which are the lead parts. Therefore, also in this case, the operator 25 of the rotary electric quantity variable element 24 can be aligned with the central through hole 22 of the rotating shaft member 12.

After the printed circuit board 23 is attached to the chassis 16 as described above, the cabinet 2 is attached from above. Next, the shaft-shaped protrusion 4 of the operating knob 1 is fitted into the rotating shaft member 12 protruding from the insertion hole 3 of the cabinet 2, and the operating knob 1 is press-fitted into the insertion hole 3 of the cabinet 2. At this time, a lubricant such as grease 8 may be placed on the inner surface of the insertion hole 3 in advance.

The positional deviation between the chassis 16 and the cabinet 2 is absorbed by the displacement of the elastic piece 17 in the directions of arrows A and B, and the printed circuit board 23 or the rotary electric quantity variable element 24 itself is also displaced accordingly.

In this manner, in this example, the rotary shaft member 12 is supported via the elastic pieces 17 that can be elastically deformed in the directions of arrows A and B, so that the rotary switch 2
4 and the insertion hole 3 of the cabinet 2 (usually about 0.1 mm), this can be corrected by utilizing the elastic deformation of the elastic piece 17. Therefore, it is possible to fit the operating knob 1 into the insertion hole 3 of the cabinet 2 and directly support it, thereby preventing rattling of the operating knob 1 or misalignment with the cabinet 2, such as It is possible to eliminate positional misalignment with the display formed on the surface of 2. In addition, since the operating knob 1 can be closely fitted into the insertion hole 3 of the cabinet 2, it is possible to fit the operating knob 1 closely into the insertion hole 3 of the cabinet 2.
A waterproof structure can be achieved easily and at low cost without using a ring or the like.

Although the present invention has been described above with reference to one embodiment, the above-mentioned embodiment can be modified in various ways based on the technical idea of the present invention. For example, the shape of the elastic piece 17 can be changed variously as necessary, and
It may be possible to deform only one of the following. Further, the elastic piece portion 17 can also be configured to be elastically deformable in the vertical direction. Furthermore, in this invention,
It is not necessarily necessary to have a waterproof structure as in the above embodiment, and in this case, the insertion hole 3 of the cabinet 2
The cylindrical protrusion 5 provided in the cylindrical projection 5 may be omitted.

As explained above, in the present invention, the rotating shaft member that is non-rotatably fitted into the fitting recess of the operating knob is pivotally supported via the elastic piece, and the operating knob and rotating shaft member are connected to each other. The structure is such that positional deviation between the two parts can be corrected by elastic displacement of the elastic piece. Therefore, the operating knob can be supported by fitting into the insertion hole of the case of the cabinet, etc., thereby eliminating rattling of the operating knob and misalignment with the cabinet, etc., and improving the operating feel. Also, it is possible to provide a rotary operation device with good appearance. Further, the present invention has the advantage that its structure is very simple and that it can be made into a waterproof structure easily and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a rotary operating device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the - line in FIG.
FIG. 3 is a sectional view taken along the line -- in FIG. 1. In addition, in the symbols used in the drawings, 1...operation knob, 2...cabinet, 3...insertion hole, 12...
... Rotating shaft member, 17 ... Elastic piece part.

Claims (1)

[Scope of utility model registration request] An elastic piece that can be elastically displaced and integrally provided on a synthetic resin base disposed inside the casing, a rotating shaft member that is rotatably supported by a shaft support provided on the elastic piece, and the casing. and an operating knob rotatably fitted into an insertion hole provided in the operating knob, and the rotating shaft members are fitted into a fitting recess provided in the operating knob so as to be able to rotate with each other. The rotary shaft is connected to each other, and is configured such that a positional deviation between the operating knob and the rotary shaft member can be corrected by elastic displacement of the elastic piece. Mounting device.