JPS6125211Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a dust-proof semi-fixed variable resistor having a structure in which a dust-proof cap is attached to the open semi-fixed variable resistor.

Conventionally, a structure in which a dustproof cap is attached to a board has been used. However, in this structure, the outer periphery of the insulating substrate is uneven, making it impossible to share with the open type.
Furthermore, since the unevenness of the insulating material is utilized, the strength is unstable.

The present invention aims to provide a dust-proof semi-fixed variable resistor with a mounting structure that eliminates these conventional problems.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a substrate made of an insulating material, which has a circular hole 1a in the center, and around the hole 1a on the surface of the substrate 1, a carbon-based resistor 2 having an arc shape is provided. Silver terminals 3 made of Ag paste are provided at both ends of the resistor 2, and are electrically connected to fixed terminals 5 made of a metal material through metal caulking studs 4. Reference numeral 6 denotes a slider made of a metal material having spring properties, and includes an arm portion 6b provided with a contact portion 6a that slides on the resistor 2, and a cutout provided on the opposite side of the contact portion 6a and bent upward. A mounting bracket 8 made of a metal material is inserted through a seat plate 7 made of an insulating material, and has a bottom portion 6c.
It is attached to the insulating substrate 1 by. Furthermore, a driver groove 6d is provided in the center of the slider 6. A portion of the seat plate 7 is inserted into the hole 1a so that the mounting bracket 8 and the resistor 2 do not come into contact with each other. Further, the slider 6 is electrically connected to an intermediate terminal plate 9 attached to the back side of the insulating substrate 1 via a mounting bracket 8, and is drawn out to the outside. Two claw portions 9a projecting outward from the outer periphery of the insulating substrate 1 are provided on a portion of the intermediate terminal plate 9. This claw portion 9a fits into a cap which will be described later. Reference numeral 10 designates a cap made of an insulating material having a hole 10a for inserting a screwdriver for slider adjustment in the center, and a claw portion 9a of the intermediate terminal board 9 on the side wall.
An engaging portion 10b that is fitted to the engaging portion 10b at a position facing the
This engaging portion 10b is connected to the claw portion 9 of the intermediate terminal plate 9.
The cap 10 is attached to the insulating substrate 1 from the resistor 2 side by fitting into the cap 1a. Also,
The cap 10 has a convex portion 10c inside, and when the slider 6 is rotated, the convex portion 10c comes into contact with the cut-and-raised portion 6c to regulate the rotation angle of the slider 6.

In the above embodiment, the claw portion 9a that is fitted into the engaging portion 10b of the insulating cap 10 is connected to the intermediate terminal plate 9.
In this case, the fixed terminals 5 located at both ends of the insulating substrate 1 are provided with claw portions, which are engaged with engaging portions provided on the insulating cap 10 at opposite positions. Alternatively, the insulating cap 10 may be attached to the insulating substrate 1 by combining both methods. In addition, in manufacturing these intermediate terminal boards 9 (or fixed terminals 5),
When the intermediate terminal plate 9 is formed into a hoop shape, if the claw portion 9a is located at the joint portion of the hoop, material removal of the hoop can be performed well.

The present invention is constructed as described above, and the shape of the insulating board may be the same as that of the open type, and the shape of the insulating board may be the same as that of the open type, and the shape of the insulating board may be the same as that of the open type. Because of the structure in which the cap is provided, the inner terminal board and the fixed terminal can be shared with the open type by simply removing the claw part, and it can be greatly rationalized as a semi-fixed variable resistor. . Furthermore, by attaching the insulating cap to the insulating substrate using the intermediate terminal board made of metal material or the claw portion of the fixed terminal as described above, it is possible to supply a product with stable strength to the user.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a dust-proof semi-fixed variable resistor according to the present invention, and FIG. 2 is an exploded perspective view of the same. DESCRIPTION OF SYMBOLS 1... Insulating board, 2... Resistor, 5... Fixed terminal, 6... Slider, 9... Middle terminal board, 9a... Claw part, 10... Insulating cap, 10b... Engaging part .

Claims (1)

[Scope of utility model registration request] A resistor formed on an insulating substrate, a slider sliding on the resistor, a fixed terminal electrically connected to both ends of the resistor, and the insulating substrate on which the resistor is formed. an intermediate terminal plate attached to the back side and electrically connected to the slider; and a plurality of insulating substrates protruding from the outer periphery of the insulating substrate provided on at least one of the intermediate terminal plate and the fixed terminal. A dust-proof semi-fixed variable resistor comprising an insulating cap having an engaging part that engages with the claw part, and an insulating cap that is attached to the insulating substrate from the resistor side by fitting the engaging part into the claw part. vessel.