JPS61289602A - Trimmer potentiometer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to the construction of a nose housing for a trimmer potentiometer, and more particularly to a construction for securing and fixing the nose housing and a base.

(Prior art) Trimmer potentiometers that have been used conventionally, especially the housing, are made of synthetic resin, and a slider block and a shaft that is screwed into the slider block are built into the cavity formed by the housing and the base, and the shaft t- There was a variable sliding type that made it possible to set a desired resistance value by rotating the multi-contact wiper of the slider block and sliding it over the resistor and electrode body disposed on the base.

This will be explained in detail below with reference to the attached drawings. In FIG. 3, a shaft 6 is rotatably installed in the housing 2 in a cavity formed by the housing 2 and the base 4 and has a threaded portion 8 on its outer periphery, and a shaft 6 is screwed into the shaft threaded portion 8. The slider block 10 is accommodated therein.

A band-shaped resistor 12 and an electrode body 14 are arranged parallel to each other on the upper surface of the base 4, and electrode bodies 15, . 15 are connected and arranged.

A resistor 12 and an electrode body 1 are placed in a recess 16 provided on the opposite lower surface of the threaded portion 9 with the shaft 6 of the slider block 10.
Coil wiper 18 that touches 4 and this wine! ? It accommodates an elastic member 20 that presses it. Code 22.24.26
are pin terminals that pass through the base 4 and are connected to the electrode bodies 14 and 15, respectively.

When the shaft 6 is rotated, the slider block 10 screwed onto the threaded portion 8 slides forward or backward on the resistor 12 and electrode body 14, 15 of the base 4 depending on the direction of rotation of the shaft. , the desired resistance value can be obtained.

(Problems to be Solved by the Invention) Regarding the assembly structure of the housing 2 and the base 4 described above, a stepped recess (not shown) is provided inside the lower end of the housing 2, and the base 4 is inserted into this recess from below. While the housing 2 and the base 4 were pushed in and reached the stepped part, the entire surface of the base 4 was poured with adhesive, etc., and the housing 2 and the base 4 were adhesively fixed.

However, when the base is pushed into the recess from below, the base 4 is moved to the desired position by the elastic repulsive force of the elastic member 20 housed in the recess 16 provided at the bottom of the slider block 10 and the multi-contact wiper ξ such as a coil wiper. It is difficult to position the coil wiper ξ on the stepped part of the resistor 12. on the top surface of the base. In order to maintain an appropriate degree of contact with the electrode bodies 14, 15, there were problems such as the need to devise an accurate configuration of the depth of the stepped recesses provided in the housing 2.

(Means and operations for solving the problem) Therefore, in the present invention, slit grooves 28 are provided on both sides of the base 2 as shown in FIG.
1. A projecting piece 3° having a shape that engages with the housing is provided protrudingly from the housing. When the base 4 is pushed into the recess (not shown) of the housing 2, the protrusion 30i of the housing 2 is engaged with the slit groove 28 of the base 4 for positioning, and then the protrusion 30 is welded and caulked 32. After that, the entire bottom surface of the base 4 is fully coated with adhesive. The base 4 is therefore easily fixed in a precise position in the recess of the housing 2. Furthermore, if the protrusion 30 of the housing 2 is formed with a groove 28 on the surface where it engages with the groove 28 of the base 4, the base 4 will not move when the protrusion 30 is welded to the base 4 and caulked. It is fixed at 2.

(Example) An example according to the present invention will be described below based on the drawings. Figures 1 to 4 are wiper ξ explaining the conventional technology.
This invention relates to a sliding variable type trimmer potentiometer. FIG. 4 is a bottom view showing the slit grooves 28 provided on both sides of the base 40. 2 is a plan view of the base 4 held in the stepped recess of the housing 2, and FIG. 1 is a plan view of the protruding piece 30.
FIG. 3 is a bottom view of the housing 2 and base 4 assembled together so that they do not move by welding and caulking 32. As shown in FIG.
By forming the portion 31, the base 4 is fixed to the housing 2 so as not to move when the protruding piece 30 is welded to the base 4.

In Figures 5 and 6, the coil wiper is a resistor on the top surface of the base,
This invention relates to a variable rotation trimmer potentiometer that rotates on the upper surface of an electrode body. In FIG. 5, the housing 34
Base 36t inserted from below - 4 of housing 34
It is a bottom view in which both members are assembled by welding and staking 40 protrusions provided at the corners. FIG. 6 is a bottom view of the base 48 assembled to the housing 42 by welding and caulking a plurality of protrusions provided on the housing 42. In addition, grooves for positioning the base 36, 48 are fully drilled on the inner surface of the housing 34°42 of the rotary variable trimmer potentiometer shown in Figs. This makes positioning easier.

(Effects of the Invention) In the present invention, the base is easily fixed at an accurate predetermined position within the recess of the housing, and the wiper slides in equal contact with the resistor and electrode provided on the base.
This is useful for improving the performance of the trimmer potentiometer, and since the base and housing can be assembled automatically using a welding and caulking device, costs can be reduced through mass production.

[Brief explanation of drawings]

FIG. 1 is a bottom view of a sliding variable trimmer potentiometer according to an embodiment of the present invention after assembly. FIG. 2 is a bottom view of FIG. 1 before assembly. 3 is a cross-sectional perspective view showing the internal structure of the sliding variable potentiometer, and FIG. 4 is a plan view of the base of the potentiometer shown in FIG. 1. FIG. 5 is an assembled bottom view of a rotary variable potentiometer according to another embodiment of the present invention. FIG. 6 is an assembled bottom view of a rotary variable potentiometer according to another embodiment. Figure 7 shows the longitudinal section of the housing shown in Figure 2, as seen from the bottom surface of the housing protrusion. ? A cross-sectional view showing the fireflies. 2...Housing 4...Base 10...
Slider block 12...Resistor 14...Electrode body 15...Electrode body 28...Groove
30... Projection piece 32... Welding caulking 34...
・Housing 36...Base 38...
Projecting piece 40...Welding caulking 42...Housing. 44...Welding and caulking 46...Welding and caulking 48
...Base patent applicant Copal Electronics Co., Ltd. Agent Patent attorney Eiko Kobayashi 1 Figure 112 Figure 131X1 m4 Figure

Claims (1)

[Claims] 1. A trimmer potentiometer in which a projecting piece provided at the end of a housing that houses a multi-contact wiper and its support member is welded to a base that closes an opening of the housing. 2. The trimmer potentiometer according to claim 1, wherein the base is provided with a groove in which the projecting piece of the housing engages. 3. The trimmer potentiometer according to claim 1, wherein protrusions provided at the four corners of the housing are welded and caulked to the base. 4. The trimmer potentiometer according to claim 1, wherein a tapered portion is formed on a surface of the projecting piece that engages with the base.