JPH0429454Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a micro-miniature push switch, particularly to a locking mechanism for a lock pin.

``Prior art'' The conventional ultra-compact push switch consists of a lock pin, a spring, a heart cam, a contact piece, etc., which are inserted, so the outer diameter is 6 mm.
It is considered extremely difficult to do the following.

``Problems to be Solved by the Invention'' However, there is a method for inserting a terminal board inside the base of an ultra-small push switch, and a recess is formed in both lower side walls of the slider, and the recess is provided with elasticity. It is extremely difficult to insert and hold it in this way due to structural or operational reasons.

In addition, integrally molding the terminal plate and the contact piece with molten resin results in a decrease in the elasticity of the contact piece due to melting and temperature, and not only does it have durability for repeated use, but it also has 100% reliability when on and off. It cannot be used unless it is %.

Therefore, the contact piece is securely held on the terminal plate and slider of the base of the ultra-compact push switch.
The technical challenge of this invention is to achieve 100% on/off reliability.

"Means for solving problems" To achieve the above technical problems, the following configuration is adopted.

An ultra-compact push switch comprising a lock pin and one end of a coil spring arranged on a base having an open end, a heart cam of a slider engaging with the other end of the lock pin, and an upper cover holding the slider movably up and down on the base. The upper end of the terminal piece is insert-molded in the side wall of the open end of the base, and the one end of the contact piece is insert-molded in the lower side walls of the slider, which has a substantially U-shaped cross section and is inserted from the open end of the base. , and a lock pin insertion groove is formed in the center of the central bulge of the bottom wall of the base, and in front of the insertion groove, a lock pin guide groove and a lock pin stopper/spring receiving seat divided into two are formed on the same axis. An object of the present invention is to provide an ultra-compact push switch characterized by the following.

"Operation" The upper end of the terminal piece is insert-molded in both side walls of the open end of the base of the push switch of the present invention,
The slider that is inserted into the base has one end of the contact piece insert-molded in both side walls, and the other end of the contact piece has sufficient elasticity, so it functions as a switch and is suitable for assembly. As the number of parts is reduced, the number of assembly steps is reduced, and costs can be reduced.

Furthermore, since there is no displacement of the contact piece when the slider moves forward or backward, the switch can be turned on and off accurately, and malfunctions of other equipment to be incorporated can be completely prevented.

In particular, the locking function of the lock pin is considered to be one of the most important in an extremely small micro switch such as the one of the present invention.

That is, when the lower end of the lock pin is inserted into the lock pin insertion groove in the central bulge of the bottom wall of the base, the lower end moves forward while being guided by the lock pin guide groove and enters the lock pin stopper/spring receiving seat which is divided into two parts. Then, it is held by the receiving seat and is strongly pressed by a coil spring inserted into the receiving seat, so that the tip of the locking pin is engaged and locked in the recess of the heart cam using the bent portion of the locking pin as a fulcrum.

"Embodiment" Next, an embodiment of the technical means of the present invention will be described based on the drawings.

Reference numeral 10 denotes a base made of a plastic material such as polyacetal resin by injection molding, and the base 10 (hereinafter referred to as the case body) has a bottomed box shape with an open end at the top.

The upper ends 121, 121 of the terminal plates 12, 12... are insert-molded on the inner walls 11, 11 of the case body 10, and the central bulging portion 14 of the bottom wall 13 of the case body 10 is inserted. A lock pin insertion groove 15 is formed in the center, and in front of the insertion groove 15, a lock pin guide groove 16 and a two-part lock pin stopper/spring receiving seat 17 are integrally formed on the same line.

18 is a notch formed at the front and rear of the case body 10 to engage with the protruding piece 23 of the upper cover 22;
Stoppers 19 are formed on the left and right sides of the notch 18.

Reference numeral 20 has a locking step portion 21 formed protruding from the upper part of the case body 10 and having a substantially U-shaped cross section, and is crowned by the flange portion 24 of the upper cover 22 .

25 is a slider in which a contact piece 26 is insert-molded using a material such as polyacetal resin.

A contact piece 26 inserted into the slider 25
As shown in FIG. 5, blocks are formed by punching left and right sides at required intervals from a strip member 261 made of a conductive material such as phosphor bronze, and after setting the blocks in a mold (not shown). When a plurality of sliders 25 are molded using molten resin injected from a nozzle, the contact pieces 26,
26... One end holding part 262 is insert-molded in both side walls 271 of the support member 27 having a substantially U-shaped cross section as shown in FIG. A passage 29 is formed, a descending staircase is formed in the circulation passage 29, and the heart cam 28
and the coil spring 3 in the axial direction via the partition wall 30.
1 recess 32 is integrally formed.

33, 33... are through holes formed around the band member 261 which is wound into a roll shape, and are automatically fed into the mold of an injection molding machine through the through holes 33... to perform insert molding. After that slider 2
It is used to remove it from the mold together with step 5 and move on to the next process.

After removing from the mold, unnecessary parts are cut off using a press.

Reference numeral 34 designates a resilient locking pin, and the lower end 341 of the locking pin 34 is inserted into the insertion groove 15 of the case body 10, passes through the insertion groove 15, and is inserted into the spring receiving seat 1.
7, the upper bent portion 342 is used as a fulcrum, and the tip 343 is inserted into the circulation passage 29 of the slider 25.
(consisting of an inclined surface and a flat surface), and is locked into the recess 281 of the heart cam 28.

Reference numeral 35 denotes a square hole formed on the upper surface of the upper cover 22, and the square hole 35 is used for inserting the knob attachment portion 36 of the slider 28 and the slider body.

Next, these assemblies will be explained.

First, insert the lower side 341 of the lock pin 34 into the lock pin insertion groove 15 of the central bulge 14 of the case body 10.
is inserted between the spring receiving seats 17, 17 along the guide groove 16.

After that, with one end of the coil spring 31 inserted into the coil spring recess 32 of the slider 25, the coil spring 31 is inserted into the open end side of the case body, and the tip of the lock pin is guided to the circulation passage 29 side, and the spring 31 is inserted in the same manner. Insert the other end into the spring receiving seat 17.

Finally, attach the upper cover 22 and insert the projecting piece 23 of the cover 22 into the notch 18 of the case body.
It is completed by fitting it into the

``Effect of the invention'' In the ultra-compact push switch of this invention, the upper end of the terminal piece is insert-molded into both side walls of the open end of the case body, and one end of the contact piece is insert-molded into the both side walls of the slider. The work of assembling the slider into the switch becomes extremely easy, and there is no contact failure or falling off due to misalignment of the terminal pieces and contact pieces, which helps improve quality and at the same time allows the switch to function satisfactorily.

Additionally, the number of parts for assembly is much smaller than in conventional methods, making it possible to automate the assembly process.

In particular, when the lower end of the lock pin is inserted into the lock pin insertion groove, the lower end moves forward while being guided by the lock pin guide groove, and when it enters the lock pin stopper/spring receiving seat which is divided into two parts, the coil spring inserted into the receiving seat. As a result, the front and rear ends of the lock pin are strongly pressed, thereby preventing the lock pin from falling off and at the same time ensuring that the tip is locked into the recess of the heart cam using the bent portion as a fulcrum.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the ultra-compact push switch of the present invention, Fig. 2 is a plan view of the case body, Fig. 3 is a front view of Fig. 2, Fig. 4 is a sectional view taken along line A-A in Fig. 2, Figure 5 is a plan view showing a block in which the contact piece to be insert-molded into the slider is stamped;
FIG. 6 is a front view of the slider showing a state in which one end of the contact piece is insert-molded in the slider, and FIG. 7 is a bottom view of FIG. 6. Explanation of symbols, 10... Base body, 11... Inner wall, 12... Terminal board, 14... Central bulge, 1
5...Insertion groove, 16...Guide groove, 25...Slider, 28...Heart cam.

Claims (1)

[Scope of utility model registration request] A lock pin 34 and one end of a coil spring 31 are disposed on a base 10 having an open end, and a heart cam 2 of a slider 25 is disposed at the other end of the lock pin 34.
8 engages and moves the slider 25 to the base 10.
In an ultra-compact push switch consisting of an upper cover 22 that is movably held up and down on the base 1,
The upper end of the terminal piece is insert-molded in the side wall of the open end of the base, and one end of the contact piece is insert-molded in the lower side walls of the slider which has a substantially U-shaped cross section and is inserted from the open end of the base, and base 10
A lock pin insertion groove 15 is formed in the center of the central bulge 14 of the bottom wall 13, and in front of the insertion groove 15, a lock pin guide groove 16 and a lock pin stopper/spring receiving seat 17 divided into two are formed on the same axis. An ultra-compact push switch characterized by: