JPS6210961Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a variable resistor used in radio receivers, television receivers, etc.

Conventional configuration and its problems Conventionally, there is a variable resistor that integrates two variable resistors as shown in FIG. 1. a ₁ ,
a ₂ , a ₃ and b ₁ , b ₂ , b ₃ are variable resistors A and B, respectively.
, terminals a ₁ and a ₂ and b ₁ and b ₂ are connected to both ends of first and second resistors 1 and 2, respectively, in which resistors are formed along the circumference. a ₃ and b ₃ are sliding bodies 5 having brushes 3 and 4 that come into contact with the first and second resistors 1 and 2 and slide on the resistors, respectively;
6. 7 is a cover. In addition,
The first and second resistors 1 and 2 are arranged coaxially and separated by a predetermined distance l. A hole is bored in the center of each of the sliding bodies 5 and 6, and toothed portions 8 and 9 are formed on the inner surface of the hole. Reference numeral 10 denotes an operating shaft in which a gear part 11 that can mesh with the teeth parts 8 and 9 is formed in the intermediate part, and is aligned in the axial direction [arrows P-Q] on the axes of the first and second resistors 1 and 2. direction] so that it can slide a predetermined distance.

Because of this configuration, when variable resistance A of the two variable resistances A and B is to be varied, pull up the operating shaft 10 as shown in FIG. In this state, rotate the operating shaft 10 around its axis [in the direction of arrow R].
By rotating the brush 3 to the first resistor 1, the contact position of the brush 3 to the first resistor 1 is changed, and the contact position between the terminals _a1 - _a3 and _a2-
The resistance value between a and ₃ changes. When variable resistance B is to be varied, it can be similarly done by sliding operating shaft 10 in the direction of arrow Q and then rotating it in the direction of arrow R so that gear portion 11 meshes with tooth portion 8.

However, in this variable resistor, the operating axis 1
0 push-pull system, the volume knobs are together, and the front and back direction of the operating shaft 10 [arrows P-Q]
Because of the stroke in the [direction], there is a drawback that it cannot be used as an adjustment volume installed in a place close to the operating shaft 10 with a door on the front.

Purpose of the invention The object of the invention is to provide a variable resistor that does not require a longitudinal stroke of the operating shaft when switching the variable resistor to be operated.

Structure of the invention The variable resistor of the invention has first and second resistors formed along the circumference and arranged coaxially at a predetermined interval. First and second sliding bodies are disposed between the resistors and can move along the resistors by contacting the respective resistors, and the switching operation is performed by passing through the first and second resistors on their axes. An intermediate gear member is inserted through the shaft and is slidable between a first position, which is located around the switching operation shaft, meshes with the first sliding member, and a second position, which meshes with the second sliding member. A common knob member is provided on the outside of the first and second resistors, the inner peripheral surface of which is formed with a tooth portion that engages with the intermediate gear member; A rotary and linear motion conversion means is provided to slide between a first position and a second position, and one of the first and second sliders to be operated is selected by rotation of the switching operation shaft, and a common knob is operated. It is characterized in that the slider on the selected side is rotated by the rotation of the member.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Components having the same functions as those in FIG. 1 are given the same reference numerals and their explanations will be omitted.

In FIG. 2, reference numeral 12 denotes a switching operation shaft which is rotated when switching the variable operation, and is disposed on the axis of the switching operation shaft passing through the first and second resistors 1 and 2. Reference numeral 13 denotes an intermediate gear member located around the switching operation shaft 12, which includes a gear part 14 that can mesh with the tooth parts 8 and 9 of the sliding bodies 5 and 6, and a gear part 15 that protrudes further outward than this gear part 14. It has a sliding body 5
The first position meshing with the tooth portion 8 of [the position shown in Fig. 2]
and a second position where it meshes with the teeth 9 of the second sliding body 6. Reference numeral 16 denotes a cylindrical common knob member located outside the first and second resistors 1 and 2, and a tooth portion 17 that meshes with the gear portion 15 of the intermediate gear member 13 is formed on the inner circumferential surface. . Reference numerals 18 and 19 denote a cam body constituting a rotational linear motion converting means that operates to slide the intermediate gear member 13 between the first position and the second position in accordance with the rotational direction of the switching operation shaft 12; The switching operation shaft 12 is rotatably fitted into the cylindrical oscillating body 19, and the intermediate gear member 13 is rotatably fitted onto the oscillating body 19 and oscillated therein. It is disposed between two flanges 20 and 21 provided on the outer peripheral surface of the moving body 19. The cam body 18 is fixed to one end of the switching operation shaft 12.

With this configuration, when changing the variable resistance A, when the switching operation shaft 12 is rotated in the direction of the arrow R, the oscillating body 19 moves against the inclined surface 2 of the cam body 18.
2, and the intermediate gear member 3 is pushed up to the first position by the flange 20. When the common knob member 16 is operated in this state, its rotation is transmitted to the sliding body 15 via the intermediate gear member 13. Further, when variable resistance B is to be varied, when the switching operation shaft is rotated in the direction of arrow S, the oscillating body 19 descends along the inclined surface 22 of the cam body 18, and the intermediate gear member 13 moves toward the flange 21. is pushed down to the second position by. Therefore, the rotation of the common knob member 16 is transmitted to the slider 6 via the intermediate gear member 13.

In the above embodiment, a means for biasing the rocking body 19 was not provided, but in some cases, a means for biasing the rocking body 19 toward the cam body 18 is provided. This can be realized by interposing a compression spring between the gear member 13 and the flange 21.

Effects of the invention As explained above, according to the variable resistor of the present invention, the variable resistance that can be varied by rotating the switching operation shaft can be selected, so there is no stroke of the operation shaft, saving space and Can be used in places with restrictions.

[Brief explanation of drawings]

1A and 1B are a longitudinal sectional view and an electric circuit diagram of a conventional variable resistor, and FIG. 2 is a longitudinal sectional view of an embodiment of the variable resistor according to the present invention. A, B... variable resistor, 1, 2... first and second resistor, 3, 4... brush, 5, 6... sliding body,
8, 9, 17...Tooth part, 11...Gear part, 12...
...Switching operation shaft, 13...Intermediate gear member, 14,
15...Gear portion, 16...Common knob member, 18
...cam body, 19...oscillating body.

Claims (1)

[Scope of utility model registration request] A first resistor and a second resistor, each having a resistor formed along the circumference, are arranged coaxially at a predetermined interval.
First and second sliding bodies are disposed between the second resistive bodies and can move along the resistive bodies while coming into contact with the respective resistive bodies, and extend through the first and second resistive bodies so as to move along the respective resistive bodies. A switching operation shaft is inserted onto the core, and it is slidable between a first position located around the switching operation shaft and meshing with the first sliding body, and a second position meshing with the second sliding body. A common knob member is provided on the outside of the first and second resistors, and the tooth portion that meshes with the intermediate gear member is formed on the inner peripheral surface, and A variable resistor provided with rotational linear motion converting means for sliding an intermediate gear member between a first position and a second position.