JPH0115131Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a variable resistor, and in particular, it is constructed by inserting a sliding body provided with a slider and a resistance board provided with a resistance layer into a case, and then gripping it with a mounting plate. This invention relates to a fixing structure for a mounting plate in a rotary variable resistor.

Conventionally, as this type of variable resistor, one having a structure as shown in FIG. 1 is known. That is, the case 1 has one end open and the other end provided with a through hole 1a.
is inserted into the mounting plate 7 from its open end side, and the tip of the mounting plate 7 is bent inward to form a bent portion 7a, thereby fixing the case 1 and the mounting plate 7. From the through hole 1a of the case 1,
The operating lever 3a, which is a part of the sliding body, protrudes, and in the space formed by the case 1 and the mounting plate 7, although it is not visible in the figure, there is a sliding body to which the slider is fixed, and A resistive substrate on which a resistive layer is formed is disposed.

By rotating the operating lever 3a, the resistance value of the variable resistor is changed.

However, when the operator rotates the operating lever 3a, the mounting plate 7 expands in the direction of the arrow in the figure because a pressing force is applied together with the rotational force, and the bent portion 7a of the mounting plate 7 eventually bends over the case 1. There was a risk that the variable resistor would come off and disassemble.

The purpose of the present invention is to eliminate the drawbacks of the prior art described above, prevent the mounting plate from spreading even if a pressing force is applied when rotating the sliding body, and facilitate installation work in a variable resistor. The plank is to provide a fixed structure.

In order to achieve this objective, the present invention provides a through hole on the other side of a case with one side open, and inserts a sliding body to which a slider is fixed from the open end side of the case, so that a part of the hole is inserted into the case. A resistor board having a resistor layer formed thereon that protrudes from the through hole and comes into contact with the slider is provided on the open end side of the case, and a mounting plate having a U-shaped cross section is externally fitted from the open end side of the case. A variable resistor formed by bending the tip of a plate inward, characterized in that hook-shaped protrusions are provided on both side walls of the case to form a gap, and a part of the mounting plate is inserted into this gap. shall be.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

FIG. 2 is a perspective view of the variable resistor according to the present invention.
FIG. 3 is an exploded perspective view thereof, and FIG. 4 is an enlarged sectional view of the main parts thereof.

In Figures 2 and 3, 1 is a case made of synthetic resin with an opening on one side and a through hole 1a on the other side, 1b is a hook-shaped protrusion provided on both side walls of this case 1, and 1c is a case of this case. A gap formed by the hook-shaped protrusion 1b and the wall surface of the case 1, 2 a click spring provided with a through hole, and 3 an insulating material provided with a protrusion that fits into the through hole of the click spring 2. A sliding body,
3a is a control lever which is a part of this sliding body 3;
is a slider fixed to the sliding body 3, 5 is an insulating substrate on which an insulating layer 6 is formed, 7 is a mounting plate made of a thin metal plate and has a U-shaped cross section, and 7a is a bent portion at the tip of this mounting plate 7. It is.

The two upper and lower bent portions 7a of the mounting plate 7 are provided so that the mounting plate 7 can be positioned vertically when the mounting plate 7 is assembled.
are provided at a position such that the distance between them is slightly larger than the length of the hook-shaped projection 1b in the vertical direction. Further, as shown in FIG. 4, the tip of the hook-shaped protrusion 1b has a tapered surface in order to facilitate insertion of the mounting plate 7 from the direction of the arrow in the figure.

When assembling, first insert the sliding body 3 with the click spring 2 locked from the open end side of the case 1, make the operating lever 3a protrude from the through hole 1a of the case 1, and then insert the sliding body 3 from the rear of the inserted sliding body 3. Slider 4
Insert the resistance board 5 so that the resistance layer 6 is in contact with the
Furthermore, the mounting plate 7 is fitted onto the case 1 from the open end side, and the bent portion 7a of the mounting plate 7 is bent inward. At this time, a part of the mounting plate 7 is inserted into the gap 1c of the case 1.

Then, when the operator slides the slider 3 against the case 1 and the resistance board 5 via the operation lever 3a, the contact position between the slider 4 and the resistance layer 6 is changed, and the variable resistor The resistance value of is changed.

Therefore, in the above embodiment, even if a pressing force is applied to the mounting plate 7 when the sliding body 3 is rotated, the portion of the mounting plate 7 inserted into the gap 1c will not touch the hook-shaped protrusion 1b. Because of this contact, the mounting plate 7 will not expand and the bent portion 7a will not come off from the case 1.

Note that the shape of the hook-shaped protrusion is not limited to this embodiment; for example, a through hole may be formed in the hook-shaped protrusion, and the bent portion of the mounting plate may be inserted into the through hole and bent inward.

As described above, according to the present invention, even if pressing force is applied when rotating the sliding body, the hook-shaped protrusion can prevent the mounting plate from spreading, so there is no risk of disassembly and damage. Since the mounting plate is also positioned in the vertical direction, the assembly work is easy.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional example, FIG. 2 is a perspective view showing an embodiment of the present invention, FIG. 3 is an exploded perspective view of the embodiment, and FIG. It is an enlarged sectional view showing the shape of the part. DESCRIPTION OF SYMBOLS 1... Case, 1b... Hook-shaped projection, 1c... Gap, 7... Mounting plate, 7a... Bent part.

Claims (1)

[Scope of utility model registration request] A through hole is provided on the other side of the case with one side open.
A sliding body to which a slider is fixed is inserted from the open end side of the case, and a part thereof protrudes from the through hole,
A resistive substrate with a resistive layer that contacts the slider is provided on the open end side of the case, a mounting plate having a U-shaped cross section is fitted from the open end side of the case, and the tip of this mounting plate is placed inside. The variable resistor is bent to form a variable resistor, characterized in that hook-shaped protrusions are provided on both side walls of the case to form a gap, and a part of the mounting plate is inserted into the gap. Fixing structure of the mounting plate.