JPS6037617Y2 - Rotary knobs for audio equipment, etc. - Google Patents

Description

[Detailed description of the invention] This invention uses a rotating shaft (F-shaped rotating shaft) with a D-shaped vertical cross section (F-shaped rotating shaft) in which a part of the circumferential surface at the end of each rotating shaft is formed into a planar shape, for example, for rotating a dial or a volume. This invention relates to a rotating knob for audio equipment, etc., which is used by being fitted onto a shaft.

Three types of conventional rotary knobs that fit on this seed-shaped rotary shaft will be explained with reference to FIGS. 1 to 3. The rotary knob shown in FIG. The insertion part B has a structure in which an insertion hole having the same shape as the shaft end of the rotation shaft C is bored, and although the structure is simple, it is easy to remove the shaft end of the rotation shaft C from the insertion hole. The disadvantage is that the removal force is not stable.

Furthermore, the rotary knob shown in Fig. 2 has an insertion hole and a vertically divided groove E similar to those shown in Fig. 1 formed in the insertion part B, and the removal force is stable, but when the temperature rises, the vertically divided RE becomes It opens and becomes unstable.

Moreover, if a rubber cap F is fitted over the opening of the insertion part B and the insertion part B and the rotation operation part A are plated, the vertical split RE
Because of this, the inner circumferential surface of the insertion hole is also plated, which makes the removal force unstable and prevents electrical insulation from the rotating shaft C when the rotating shaft C is received in the insertion hole. It will also be difficult.

Furthermore, in the rotary knob shown in Fig. 3, the elongated hole G is connected to the insertion hole of the insertion part B, so the shape of the rubber cap F that fits into the insertion part B is complicated, and therefore, it is difficult to perform the plating process. It becomes difficult to insulate the inner peripheral surface of the insertion hole with plating.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks and provide a rotary knob for audio equipment, etc., which has a stable removal force on the rotary shaft and allows plating to be applied only to necessary parts.

Hereinafter, the present invention will be explained based on the drawings of the embodiments. Fig. 4 is a perspective view of a rotary knob according to the present invention, and Fig. 5 is a rear view of the same knob.

In the figure, 1 is a rotating shaft, 1a is a plan view formed at the tip of the rotating shaft 1, 2 is a rotating operation section, and 3 is an insertion cylinder, and this insertion cylinder 3 and rotation operation section 2 are integrally made of synthetic resin. Mold.

Then, on the inner peripheral surface of the insertion cylinder 3, a plurality of protruding pieces 4a, 4b, 4c, etc. are provided along the axial direction and inwardly.
The protruding pieces 4a, 4b, 4c, . Form small.

In addition, in the drawing, the protruding piece 4a is the flat part 1 of the rotating shaft 1.
a, 4c, and 4d are respectively crimped to the arc circumferential surface 1b, and the opposing protruding pieces 4b and 4e are configured to simply contact the flat part 1a, and the protruding pieces 4a, 4c, and 4d The corner portions are chamfered 6 to facilitate insertion of the rotating shaft 1.

Therefore, if the tip of the rotating shaft 1 is inserted into the insertion portion 5 of the insertion cylinder 3, the shape of the insertion portion 5 will change to the shape of the rotating shaft 1 as described above.
As shown in FIG. 5, the portion of the insertion cylinder 3 that connects with the protruding pieces 4a, 4c, and 4d bulges outward as shown by dotted lines, and therefore, as shown in FIG.
Due to the restoring force, the protruding pieces 4a, 4c, and 4d are pressed against the flat surface 1a and the arc circumferential surface 1b of the rotating shaft 1, respectively, and the opposing protruding pieces 4b and 4e are brought into contact with the flat surface 1a, and the rotating shaft 1
is rotated in conjunction with the rotation knob.

The present invention is based on a rotary operation part made of synthetic resin, which is used in a rotary knob of an audio equipment, etc., which is fitted onto a rotary shaft whose circumferential surface is partially shaped into a planar shape. A plurality of protruding pieces are provided to protrude inward from the inner circumferential surface of the insertion cylinder connected to the distal end, and the inserting part that receives the distal end of the distal end shaft of the rotating shaft is rotated by the protruding pieces. The rotating shaft, which is slightly smaller in size than the shaft and press-fitted into the insertion portion, bulges out the insertion cylinder through the protruding piece, and its restoring force crimply holds the insertion cylinder in a non-rotatable manner.

Therefore, in the rotary knob according to the present invention, the removal force to the rotating shaft 1 is stable, and since the insertion cylinder 3 does not have a cut groove or the like, the removal force is not affected by temperature.

In addition, since the rotating shaft 1 is crimped so as not to rotate by the plurality of protruding pieces 4a, 4b, 4c, . . . , the dimensional accuracy of the insertion cylinder 3 may be low, and mold production is easy and costs can be reduced.

Furthermore, during the plating process, since the insertion cylinder 3 has a cylindrical shape, the rubber cap is in close contact with the end of the insertion cylinder 3, and therefore,
Plating insulation on the inner surface of the insertion cylinder 3 is ensured.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional rotary knob and a rotating shaft, FIGS. 2 and 3 are perspective views showing other conventional rotary knobs, and FIG. 4 is a perspective view showing a rotary knob according to the present invention. FIG. 5 is a perspective view showing a rotation knob and a rotation shaft, and FIG. 5 is a rear view of the rotation knob. 1... Rotation axis, 1a... Plan view, 2.
... Rotating operation section, 3 ... Insertion cylinder, 4a
y 4b, 4c...Protruding piece, 5...
Insertion part.

Claims (1)

[Scope of utility model registration request] In a rotary knob for an audio device, etc., which is fitted onto a rotary shaft with a part of the circumferential surface formed into a planar shape, the inner periphery of the rotary operation part and the insertion cylinder connected to its tip, which are made of synthetic resin. A plurality of protruding pieces are provided to protrude inward from the surface, and an insertion portion for receiving the tip of the distal end shaft of the rotating shaft is formed by the protruding pieces to be slightly smaller than the rotating shaft. A rotary knob for an audio device, etc., characterized in that a rotary shaft press-fitted into the projection piece bulges out the insertion cylinder through the protruding piece, and its restoring force crimply holds the insertion cylinder in a non-rotatable manner.