JPS6233376Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a mounting mechanism for a dial thread hook pulley used to suspend a dial thread for moving a dial needle of a radio, a cassette tape recorder with a radio, or the like.

2. Description of the Related Art Conventionally, there is a mechanism for attaching a dial threading pulley for moving a dial needle used in radios, radio cassette tape recorders, etc., as shown in FIGS. 1 and 2. That is, in the case shown in FIG. 1, a female threaded hole 1'b is provided in a mounting boss portion 1'a that bulges on the chassis 1', and a threaded portion 10a that is screwed into this female threaded hole 1'b with a screwdriver is inserted at the tip. The pulley body 2' was rotatably attached to the mounting boss portion 1'a using a special screw 10 formed on the outer periphery. However, in this conventional pulley mounting mechanism, the threaded portion 1 is attached only to the tip of the pulley body 2', excluding the mounting location.
It is necessary to prepare a special screw 10 with a diameter of 0a, and a female screw hole 1'b into which the threaded part 10a is screwed must be formed in the mounting boss part 1'a of the chassis 1'. The drawbacks were that it was time-consuming and expensive to produce.

The pulley body 2'' is rotatably attached to the attachment boss portion 1''a of the chassis 1'' using a shaft body 11 having a head 11a.However, this conventional attachment mechanism Pulley body 2″
After inserting the shaft body 11 into the pulley body 1'', the tip of the shaft body 11 is caulked and fixed to the mounting boss portion 1''a using a caulking machine, which requires time and effort to attach the pulley body 1''.

The present invention was developed in view of the above-mentioned points, and its purpose is to reduce the number of parts by forming a shaft on the pulley body to be attached to the chassis, and also to make it possible to attach the pulley body to the chassis with a single touch. To provide a mounting mechanism for a dial threading pulley, which can be mounted on a dial threader, thereby simplifying the mounting work and reducing costs.

The present invention will be explained below with reference to an embodiment shown in FIGS. 3 and 4.

1 is a chassis with a bulging mounting boss portion 1a; 2 is a pulley body made of elastic synthetic resin and provided with a groove 2a on the outer periphery for suspending the dial thread 3; Forms an annular recess 2b into which the mounting boss 1a is loosely fitted, and a shaft 2c protrudes from the center of the annular recess 2b. 2c ₁ and 2c ₁ are tapered locking portions formed at the outer peripheral tip of the shaft body 2c;
c ₁ and 2c ₁ engage with the bottom surface of the hole 1a 1 when the shaft body 2c is inserted into the hole 1a ₁ provided on the top surface of the mounting boss portion 1a and the pulley body ₂ is rotatably mounted. , to prevent the shaft body 2c from coming out of the hole _1a1 . 2c ₂ is a hole provided on the lower surface of the shaft body 2c.

Since one embodiment of the present invention has the above-described configuration, in order to attach the pulley body 2 to the attachment boss portion 1a of the chassis 1, the shaft body 2c of the pulley body 2 must be attached to the attachment boss portion 1a of the chassis 1. The locking portions 2c _{1 and} 2c 1 are inserted into the hole 1a 1 provided in the hole 1a 1 and the locking portions 2c 1 and 2c ₁ are engaged with the lower surface of the hole 1a ₁ .
By rotatably and loosely fitting the mounting boss portion 1a into the mounting boss portion 1a of the chassis 1, the pulley body 2 is attached to the mounting boss portion 1a of the chassis 1.
Attach to a. Attach the shaft body 2c to the hole 1 of the boss portion 1a.
When inserting into the hole _{1a 1} , the locking parts 2a, 2a are tapered and a hole 2c ₂ is formed on the lower surface of the shaft 2c, so insert the shaft 2c into the hole 1a ₁ . In this case, the shaft body 2c is compressed and can be easily inserted into the hole _1a1 , and after the locking parts _2c1 , _2c1 are inserted into the shaft body 2c, the locking parts _2c1 , _2c1 are attached to the lower surface of the hole 1a. Since they are engaged, the shaft body 2c will not come out of the hole _1a1 .

When the dial thread 3 is moved by rotating a dial (not shown), the pulley body 2, which suspends the dial thread 3 in a groove 2a provided on the outer periphery, rotates around the shaft 2c. . On this occasion,
Even when a radial load is applied to the pulley body 2 due to the tension of the dial thread 3, the inner wall of the annular recess 2b will slightly slide into contact with the mounting boss 1a at the portion where the load is applied. Therefore, the pulley main body 2 rotates stably around the shaft body 2c without lateral vibration.

If you want to replace the old pulley body 2, you can forcefully pull the shaft 1a from the hole 1a _1.The shaft 1a is also made of a synthetic resin plastic material that exhibits elasticity, just like the pulley body 2. Since a hole _2c2 is formed on the lower surface of the shaft body 2c, the shaft body 2c is pressed against the inner wall of the hole _1a1 and narrows, so that the locking parts _2c1 , _2c1 can be easily removed from the hole _1a1 . I can do it.

As mentioned above, in this invention, the shaft body is formed on the pulley body, so it is easy to operate with just one touch by simply inserting the shaft body into the hole of the mounting boss, without using special screws or separate shaft bodies as in the past. The pulley body can be attached to the mounting boss part of the chassis, and since the annular recess of the pulley body is supported by the mounting boss part, the connection between the shaft body of the pulley body and the hole in the mounting boss part of the chassis is improved. Even if a large play is formed between them to facilitate installation, it is possible to prevent the pulley body from playing against the chassis, and therefore to prevent the dial thread from coming off due to play in the pulley body.
Furthermore, by preventing the shaft portion of the pulley body from protruding beyond the mounting boss portion of the chassis, the thickness of the pulley mounting mechanism can be reduced.
It has the advantage of being optimal as a mounting mechanism for pulleys for thin radios such as pocket radios.

[Brief explanation of drawings]

1 and 2 are sectional views showing two examples of conventional dial threading pulley mounting mechanisms, and FIG. 3 is a plan view showing the dial threading pulley mounting mechanism of the present invention. FIG. 4 is a sectional view as well. 1... Chassis, 1a... Mounting boss part, 1a ₁ ...
...hole, 2...pulley body, 2a...groove, 2a ₁ ...
...Locking portion, 2b...Annular recess, 2c...Shaft body.

Claims (1)

[Scope of utility model registration request] A mounting boss portion having a recess is formed, and
A chassis having a hole formed in the top surface of the mounting boss portion, and a groove portion around the outer periphery around which the dial thread is wound;
Further, an annular recess is formed inside to be supported by the mounting boss portion of the chassis, and a shaft body is formed that protrudes from the center into the annular recess, is elastically fitted into the hole of the chassis, and is rotatably locked. 1. An attachment mechanism for a pulley for dial threading, characterized in that the tip of the shaft does not protrude beyond a recess in an attachment boss portion of a chassis.