JPH0517843Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Technical Field of the Invention" This invention relates to an improvement of a small variable resistor switch with a built-in switch.

``Prior art'' Conventional small variable resistor switches of this type include the invention in Japanese Utility Model Publication No. 57-44642 and the improved invention in Japanese Utility Model Application Publication No. 60-163704, filed by the same applicant as the present application. , they include a switch plate in which a single flat switch movable piece is connected from a seat plate portion to a connecting terminal on the outer bottom of the box by a rivet on a stepped surface inside the box;
Since the movable piece is arranged relative to the contact plate so as to act as a switch, the movable piece of the single flat switch plate tends to have too light a leaf spring force, and the switch feel is very weak. When used for a long period of time, spring fatigue and loosening can occur quickly at the connection base with the seat plate, leading to concerns about poor contact and long-term stability, and the connection terminal of the switch plate Rivet installation requires a seat plate and two rivet parts, which requires troublesome work, resulting in poor workability and high assembly costs.
It has been discovered that the disadvantage of this type of small variable resistor is that it is expensive.

``Purpose'' The purpose of the present invention is to easily eliminate the drawbacks of the above-mentioned previous designs.The purpose of the present invention is to use a bifurcated spring switch plate instead of a single flat plate for the switch plate.
The forked spring plate and the upright plate part provided at the tip of the connection terminal are fitted and projected onto the step surface of the case, making the installation work of the switch plate very simple and efficient. In this way, the assembly structure cost of the switch mechanism is made easier.Furthermore, by having a two-pronged spring switch plate, the plate spring force is strengthened, the switch feels good, and the durability of the spring is ensured, thereby eliminating spring fatigue and loosening. This makes it possible to produce a switch mechanism with excellent long-term stability and excellent performance without contact failure at a low cost.In addition, the connection terminal on the side that connects the switch board can be riveted in only one place, which saves parts. The purpose is to provide an inexpensive small-sized variable resistor that guarantees simplification of work, has high switching performance, and economical long-term performance.

"Structure" An embodiment of the present invention will be described below with reference to the drawings.

A small variable resistor equipped with a switch mechanism connected to connection terminals 3 and 4 disposed relative to the outer bottom of the case on the step surface 2 provided on the inner circumferential wall of the case 1 in which the variable resistance mechanism is built-in. On one side on surface 2,
A contact plate 6 having a contact portion 5 riveted to one of the fixed connection terminals 3 is placed on the outer bottom of the box, and a flat plate is fitted on the other side of the stepped surface 2 at a considerable distance from the contact plate 6. An elongated slit 7 is bored from the outer bottom of the box at right angles to the step surface 2, and the tip is fitted into the slit 7 to a length such that the upper part 8' protrudes considerably outside the hole. The flat plate 8 of the other connection terminal 4 folded upright is inserted into the upright flat plate 8 of the terminal 4, and the terminal 4 is fixed with rivets with the upper part 8' protruding outside the hole. On the other hand, a cam plate 10 is used to connect the lower plate from a ring-shaped spring base 9 with a diameter that is press-fitted to both sides of the upper part 8'.
1 is a movable plate 12 of a required length on which the contact portion 5 of the contact plate 6 is switched, and the upper plate is folded outward slightly at the tip and lower sides of the trouble points at the required length. A locking plate 15 is provided with pieces 13 and 14.
Two-pronged spring switch plate 16 with a slightly open spring shape
The spring base 9 is fitted in such a way that the movable plate 12 side is switched by the cam plate 10, and each folded piece 13, 14 is attached to the box wall portion of the locking plate 15 corresponding to each folded piece 13, 14. Corresponding hole 1 for loosely fitting
7 and 18 are provided, and the corresponding folded pieces 13 and 14 are loosely fitted into the fitting holes 17 and 18, and the upper part 8'
It is constructed by fitting and equipping it as a mounting shaft. In addition, the outward small folded piece 1 on the front side of the locking plate 15
If the wall portion in which the fitting hole 18 for 4 is provided is formed in the overhanging thick wall 19 as shown in the figure, the folded piece 14 can be a short piece having the same length as the folded piece 13 at the tip, and the thick wall 19 If not provided, the corresponding folding piece 14
is a long folded piece that is simply inserted into a hole in the box wall, and its design can be changed at will.

In the figure, 20 is an element, and 21 is a rotating shaft.

"Function" Since the present invention is constructed as described above, the other connecting terminal 4 fits the upright flat plate 8 at its tip from the outer bottom of the box into the elongated slit 7 bored perpendicularly to the stepped surface 2. If the upper part 8' is made to protrude at right angles above the step surface 2 and a rivet is fixed at one place, a fixing device is formed by fitting the tip into the hole, and the upper part 8' of the protrusion The two-pronged spring switch plate 16 is then fitted using this as a mounting shaft.

The switch plate 16 originally has a slightly spring-open shape, and the fitting of the switch plate 16 to the upper part 8' is achieved by the presence of a ring-shaped spring base 9 with a diameter that fits on both sides of the upper part 8'. Then, the movable plate 12 is placed on the lower side so as to be operated by the cam plate 10, and the base 9 is
If the spring is fitted to the upper part 8', the inner periphery of the base part 9 will be securely pressed against both sides of the upper part 8', and the switch plate 16 will be shaped like a spring with the upper part 8' as the mounting axis. As a result, the locking plate 15 side is spring-opened toward the case wall, and the spring force is used to open the outward small folded sides 13 provided on the lower sides of the tip and front portions. , 14 are inserted into the corresponding fitting holes 17 and 18 in the box wall, respectively, and the end locking will reliably prevent the locking plate 15 from slipping off.
In addition, locking on the front side serves to reliably prevent the base portion 9 from coming off and coming off when the movable plate 12 is moved by the cam plate 10.

As a result, the bifurcated switch plate 16
By fitting into the upper part 8' from above and fitting the locking plate 15 into two holes using spring force, it can be easily, securely and quickly fitted into the upper part 8' without coming off at all. installation is done.

As the movable plate 12 springs around the base 9 by rotating the cam plate 10, the fork spring switch plate 16 moves the locking plate 12 around the base 9.
On the 5th side, the holes of the bent sides 13 and 14 are loosely fitted, so the springs are interlocked with each other, so the spring force of the bifurcated spring is stronger than that of a conventional single flat switch plate. Since the switch has a sufficient feel and a good switch action, and it is sure to prevent poor contact of the switch and lifting of the base 9, there is no fear of poor contact of the base 9 with the upper part 8'. .

"Effect" As described above, the two-pronged spring switch plate 16 of the present invention
Because the spring force is strong, the switch feel is sufficient and good.In addition, compared to the conventional single flat plate, the spring durability is extremely high, so there is no spring fatigue or loosening, and therefore the switch contact is easy. No defects occur, long-term performance is extremely stable, and long-term usability is guaranteed.

Also, the other connection terminal 4 is attached to the upright flat plate 8.
Since the rivet only needs to be fixed at one location by hole fitting, the number of rivet parts is saved and the installation work is simple and efficient.

Also, the installation work of the bifurcated spring switch plate 16 is only done by fitting the spring into the protruding upper part 8' of the upright flat plate 8 of the base 9 and fitting the small folded pieces 13 and 14 into holes by utilizing the force of the opening spring of the locking plate 15. Because it can be done easily and quickly, the installation work efficiency is outstanding.
Further, since the upper part 8' can be formed into a simple rectangular shape, the terminal 4 can be easily manufactured, and the switch plate 16 can be fitted very easily. , 14 from the holes, the base 9 can be easily removed upward from the upper part 8', making it easy to replace and install the switch plate 16, and simplifying the switch mechanism. Combined with the ease of spring fitting, the assembly work of the switch mechanism is very efficient and can be done at a very low cost.We provide a small variable resistor with a built-in switch that has good switch performance, low cost, and high productivity, and is in high demand. There are effects such as being able to do it.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an enlarged plan view, Fig. 2 is an enlarged slope view of the switch board,
FIG. 3 is an enlarged perspective view of the other connection terminal to which the switch plate is attached, and FIG. 4 is an enlarged partial cross-sectional view of the switch plate attachment portion. 1... Case body, 2... Step surface, 3, 4... Connection terminal, 6... Contact plate, 7... Elongated slit, 8...
Upright flat plate, 8'... Upper part, 9... Annular spring base, 12... Movable plate, 13, 14... Outward small folded piece, 15... Locking plate, 16... Bifurcated spring switch plate, 17, 18... Fitting hole.

Claims (1)

[Scope of utility model registration request] A small variable resistor equipped with a switch mechanism connected to connection terminals 3 and 4 disposed relative to the outer bottom of the case on the step surface 2 provided on the inner circumferential wall of the case 1 in which the variable resistance mechanism is built-in. On one side on surface 2,
A contact plate 6 having a contact part 5 riveted to one of the fixed connection terminals 3 is arranged on the outer bottom of the box, and on the other side on the stepped surface 2 which is quite far from the contact plate 6,
An upright flat plate 8 whose tip end is fitted into the slit 7 and has a length such that the upper part 8' protrudes considerably outside the hole.
Insert the flat plate 8 of the other connecting terminal 4 which has been folded upright into the hole, make the upper part 8' protrude outside the hole, fix the terminal 4 with rivets, and fix the terminal 4 to the upper part 8' which protrudes outside the hole.
A movable plate 12 whose tip end contact portion 11 is switched to the contact portion 5 of the contact plate 6 by a cam plate 10, which connects the lower plate from a ring-shaped spring base 9 with a diameter that is press-fitted to both sides of the upper portion 8'. In addition, a bifurcated spring switch plate 16 is provided with outward small bent pieces 13 and 14 on the lower sides of the top and front parts of the upper plate, respectively, to serve as a locking plate 15.
, so that the movable plate 12 side is switched by the cam plate 10, and the spring base 9 is fitted with a spring, and each of the folded pieces 13, 14 of the locking plate 15 is inserted into the corresponding fitting holes 17, 18 provided in the case wall. A small variable resistor switch in which the switch plate 16 is loosely fitted to the upper part 8' with the upper plate 8' serving as a mounting shaft.