JPH0434572Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a dial drive device for a radio receiver.

Conventional technology Conventionally, dial drive devices for radio receivers, etc.
As shown in FIGS. 2 and 3, a bearing 1c is provided on the intermediate chassis 1, which is fixed with a screw 5 to a boss 4a protruding into the cabinet 4, and the shaft 3b of the intermediate drum 3 is inserted into the bearing 1c. and the above intermediate drum 3
is fixed to the intermediate chassis 1 by a claw a at the optical end of the shaft, and the shafts 2a and 2b of the tuning knob 2 are mounted in mutually opposing bearing holes 1a provided in the intermediate chassis 1.
and 1b, the intermediate drum 3 was attached so as to mesh with the gear 2c of the tuning knob 2.

Problems to be Solved by the Invention However, in the above structure, the shafts 2a and 2b of the tuning knob 2 are attached to the intermediate chassis 1.
In order to configure the bearing holes 1a and 1b for fitting the intermediate chassis, the mold structure of the intermediate chassis becomes complicated, leading to increased mold costs, mold troubles during production, and a decline in the quality of the intermediate chassis. . Furthermore, insert the tuning knob into the bearing hole 1 of the intermediate chassis 1.
In order to insert and fix between a and 1b, it is necessary to insert the tuning knob 2 while pushing apart the plate portion of the intermediate chassis 1 having the bearing holes 1a and 1b, which results in very poor insertion workability. Ta.

Means for Solving the Problems In order to solve the above problems, the dial drive device of the present invention has a knob shaft provided in the intermediate chassis in the same direction as the bearing for mounting the intermediate drum, and a dial drive device inserted into the knob shaft. A plate portion is provided above the gear of the tuning knob to be engaged with the intermediate drum supported by the bearing of the intermediate chassis, and the tip of the knob shaft supporting the tuning knob is inserted into the bearing hole of the cabinet to which the intermediate chassis is installed. The feature is that they fit together.

Effect The present invention has the above-described configuration, and by supporting the intermediate drum on the intermediate chassis bearing with the tuning knob supported on the knob shaft of the intermediate chassis, the intermediate drum is meshed with the gear of the tuning knob. Step 1 on the top of the gear
5 Since it will be engaged with the above intermediate drum,
During assembly, the tuning knob is prevented from falling off by the intermediate drum, and when the intermediate chassis is assembled into the cabinet, the knob shaft of the intermediate chassis is fitted into a bearing hole provided in the cabinet and serves as a bearing for the tuning knob. Therefore, the tuning bearing of the intermediate chassis can be eliminated, thereby reducing the mold cost of the intermediate chassis and improving the quality of the intermediate chassis. Furthermore, the tuning knob can be prevented from falling off during assembly work, and the tuning knob can be easily inserted, reducing assembly time.

Embodiments Hereinafter, embodiments of the dial driving device of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of a dial driving device in an embodiment of the present invention. In FIG. 1, 11 is an intermediate chassis, 12 is a tuning knob, 13 is an intermediate drum, and 14 is a cabinet.

The intermediate chassis 11 has a bearing 11b and a knob shaft 11a extending in the same direction, and is fastened to a boss 14b protruding into the cabinet 14 with a screw 15. The tuning knob 12 has a stepped portion 12a at the top of the gear 12b, and is supported by the knob shaft 11a of the intermediate chassis 11. The intermediate drum 13 has a gear 13b on its outer periphery that meshes with the gear 12b of the tuning knob 12, and a central shaft 13c is inserted into the bearing 11b of the intermediate chassis 11, and a pawl 13a provided at the tip of the shaft 13c is used to rotate the intermediate drum. It is rotatably supported by the chassis 11. The cabinet 14 has a bearing hole 14a into which the tip of the knob shaft 11a of the intermediate chassis 11 is fitted.

In the dial drive device having such a configuration, after the tuning knob 2 is inserted into the knob shaft 11a of the intermediate chassis 11, the bearing 11 of the intermediate chassis 1 is inserted.
The intermediate drum 13 is inserted into the intermediate drum 13, and the intermediate drum 13 is rotatably fixed to the intermediate chassis 11 by the claw 13a at the tip of the shaft of the intermediate drum 13. Next, insert the intermediate chassis 11 into the cabinet 14, and insert the tip of the knob shaft 11a of the intermediate chassis 11 into the cabinet 1.
4, and the intermediate chassis 11 is fixed to the boss 14b of the cabinet 14 with screws 15. With this structure, when the tuning knob 12 is inserted into the knob shaft 11a of the intermediate chassis 11, the tuning knob 12 will fall out toward the cabinet 14 side when the intermediate chassis 11 is assembled into the cabinet 14, so that the tuning knob 1
A stepped portion 12a is provided on the upper part of the gear 12b of the tuning knob 12 to prevent the intermediate drum 13 from hitting or missing the gear 12b of the tuning knob 12. Therefore, the tuning knob 12 can be prevented from falling off, and the bearing for the tuning knob of the intermediate chassis 11 can be eliminated.

Effects of the invention As described above, the present invention prevents the tuning knob from falling off by providing a plate above the gear of the tuning knob and applying it to the intermediate drum that meshes with the gear of the tuning knob, thereby preventing the bearing of the intermediate chassis from falling off. Since it has been abolished, it is possible to reduce mold costs for intermediate chassis and improve quality. Further, the inserting operation of the tuning knob is improved, and the number of man-hours can be reduced.

[Brief explanation of drawings]

Fig. 1 is a sectional side view of a dial driving device according to an embodiment of the present invention, Fig. 2 is a sectional side view of a conventional dial driving device, and Fig. 3 is a sectional view of the tuning knob attachment part of the same device. . 11...Intermediate chassis, 11a...Knob shaft,
11b... Bearing, 12... Tuning knob,
12b... Gear, 12a... Step portion, 13... Intermediate drum, 14... Bottom cabinet, 14a... Bearing hole.

Claims (1)

[Scope of utility model registration request] An intermediate chassis having a knob shaft screwed to a boss protruding into the cabinet and fitted into a bearing hole provided in the cabinet; and a tuning knob inserted into the knob shaft protruding from the intermediate chassis. and an intermediate drum that is rotatably fitted into a bearing protruding from the intermediate chassis in the same direction as the knob shaft and meshed with the gear of the tuning knob, 2. A dial drive device, characterized in that a plate portion is provided above the gear, the plate portion being in contact with the intermediate drum to prevent the tuning knob from coming off the knob shaft.