JPH0528668Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a switch that is operated by a push operation.

[Conventional technology]

In a conventional switch of this kind, the slider and cover do not engage with each other, making it impossible to partially assemble them and making it inconvenient to handle. Another disadvantage was that the movable contact piece and presser spring assembled in the slider tend to come off due to impact.

[Means to solve the problem]

According to this invention, a pair of fixed contact pieces are attached to the bottom plate of a resin case, the upper open surface of the case is covered with a resin cover, and the cover is extended vertically to face the inner surface of the cover. Two pairs of leg pieces are provided integrally, and a slider made of resin is placed in the case so as to be able to move up and down while being guided by the two sets of leg pieces, and is returned between the slider and the bottom plate of the case. A movable contact piece is arranged on the slider, and both ends of the movable contact piece face a pair of fixed contact pieces, and the movable contact piece is pressed downward by a coiled pressing spring held by the slider. A small protrusion is formed on the end of the leg, and a small protrusion that can engage with the small protrusion is formed on the slider. A displacement prevention bent portion is formed on the movable contact piece, and the displacement prevention bent portion is inserted into the displacement prevention hole of the slider. A positioning protrusion is formed on the movable contact piece, a boss is provided on the cover or the slider, and the positioning protrusion and boss are inserted on both sides of the coiled pressure spring.

〔Example〕

The figure shows an embodiment of this invention. A rectangular parallelepiped resin case 11 whose upper surface is an open surface is provided. A pair of fixed contact pieces 1 are attached to the bottom plate 11a of the case 11.
2 and 13 are attached, and each terminal of the fixed contact pieces 12 and 13 is led out to the outside of the case 11. The upper open surface of the case 11 is covered with a cover 14 made of resin. A U-shaped engagement piece 15 is integrally formed around the cover 14 and extends vertically, and is engaged with an engagement claw 46 formed on the side surface of the case 11 to close the cover 1.
4 is attached to the case 11.

Two pairs of leg pieces 16 are integrally provided on the inner surface of the cover 14, facing each other and extending vertically. A slider 17 made of resin is disposed within the case 11 so as to be movable up and down while being guided by these two pairs of legs 16. A return coil spring 18 is interposed between the slider 17 and the case bottom plate 11a. Slider 17
A positioning hole 19 is formed in the bottom surface of the case, into which the upper side of the return coil spring 18 is inserted, a positioning projection 21 is projected from the case bottom plate 11a, and the coil spring 18 is positioned by the positioning projection 21. The operation part 17a of the slider 17 is connected to the hole 22 of the cover 14.
It protrudes more outward.

A movable contact piece 23 is arranged on the slider 17. A movable contact piece mounting portion 24 is integrally formed to protrude from the lower side surface of the slider 17, and the movable contact piece 23 is formed by bending the center part of a rectangular plate-like piece into a U-shape.
The letter-shaped portion is fitted and placed on the movable contact piece placement portion 24,
Both ends of the movable contact piece 23 face the fixed contact pieces 12 and 13. A bending portion 25 for preventing slippage is integrally extended downward from the side edge of the central portion of the movable contact piece 23,
A displacement prevention bent portion 25 is inserted into a displacement prevention hole 26 formed in the slider 17.

Coiled pressing spring 2 held by slider 17
7 holds the movable contact piece 27 downward.
The upper end of the pressing spring 27 is engaged with the stopper 28 of the slider 17, and the lower end of the pressing spring 27 is engaged with the stopper 28 of the slider 17.
3, the movable contact piece 2 is moved by a pressing spring 27.
3 is held down. A positioning protrusion 29 is pushed out from the movable contact piece 23, and a pressing spring 27 is inserted onto this protrusion 29 for positioning. A boss 31 projecting downward is integrally provided on the inner surface of the cover 14, and the boss 31 is inserted into the presser spring 27.

In this example, a push-button configuration is used, and a heart cam 32 is formed on the side surface of the slider 17 opposite to the movable contact piece 23, one end of the hook 33 engages with the heart cam 32, and the other end of the hook 33 engages with the heart cam 32. is engaged with the bottom plate 11a of the case. The hook 33 is held within the heart cam 32 by a leaf spring 34.

A small protrusion 35 is integrally formed on the end of the leg piece 16 to face the slider 17.
A convex portion 36 that can be engaged with 5 is integrally formed. Note that both ends of the slider 17 are sandwiched between the leg pieces 16 and the slider 17 is guided. Slider 1 with convex portion 36 engaged with retaining small protrusion 35
The operating portion 17a of No. 7 is prevented from coming out from the hole 22. Cover 14 covers operating section 17a of slider 17.
When the slider 17 is inserted into the hole 22 from the bottom thereof and pushed open between the small retaining protrusions 35 and the convex portion 36 is passed between them, the slider 17 is held by the cover 14 so as to be able to move up and down.

When the operation part 17a is pushed into the case 11, the movable contact piece 23 comes into contact with the fixed contact pieces 12 and 13, and the contact state is held by being elastically pressed by the pressing spring 27, and the contact between the fixed contact pieces 12 and 13 is maintained. are electrically connected. After pressing the operating part 17a again, when you release your hand from the operating part 17a, the slider 17 moves upward due to the spring force of the return coil spring 18, and the movable contact piece 23 separates from the fixed contact pieces 12, 13 and is fixed. The contact pieces 12 and 13 are electrically disconnected.

Note that the boss 31 may be provided on the slider 17 instead of the cover 14. Instead of protruding or bending the movable contact piece 23, the slider 17 may be provided with a protrusion, and the protrusion may be inserted into the lower end of the pressing spring 27.

[Effect of idea]

The slider 17 is held by the cover 14 so as to be movable up and down, and is in a partially assembled state, facilitating assembly work. The movable contact piece 23 is formed with a bent portion 25 for preventing misalignment, and this bent portion 25 is inserted into a hole 26 for preventing misalignment in the slider 17, so that the movable contact piece 23 is unlikely to come off the slider 17. A positioning protrusion 29 or projection is formed on the movable contact piece 23, and a boss 31 is attached to the cover 14 or the slider 17.
Since these are inserted into the pressing spring 27, the pressing spring 27 is difficult to come off.

[Brief explanation of drawings]

Figure 1 shows an example of the switch of this invention, a front view with the case cut away, Figure 2 is a vertical sectional view of the switch of this invention, Figure 3 is a vertical sectional view 90 degrees different from Figure 2, and Figure 4. 5 is a side view showing the cover and the slider, and FIG. 5 is a bottom view of FIG. 4.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of fixed contact pieces are attached to the bottom plate of a resin case, the upper open surface of the case is covered with a resin cover, and the top and bottom are opposite to the inner surface of the cover. Two pairs of extended leg pieces are provided integrally, and a slider made of a resin material is placed inside the case so as to be able to move up and down while being guided by these two sets of leg pieces, and between the slider and the bottom plate of the case. A return coil spring is interposed, a movable contact piece mounting portion is integrally formed on the slider to protrude in the lateral direction, an intermediate portion of the movable contact piece is arranged on the movable contact piece mounting portion, and the movable contact piece Both ends of the leg face the pair of fixed contact pieces, the movable contact piece is pressed downward by a coiled presser spring held by the slider, and a small protrusion for preventing removal is formed at the end of the leg piece. The slider is formed with a small convex portion that can engage with the small protrusion for preventing slippage, and a bending portion for preventing slippage is integrally extended downward from the side edge of the intermediate portion of the movable contact piece. inserted into a slippage prevention hole formed in the slider, a positioning protrusion is formed upward in the middle part of the movable contact piece, and a boss is formed to protrude downward from the cover or the slider opposite to the protrusion; Both ends of a presser spring are positioned at the boss and the protrusion, and the movable contact piece is pressed onto the movable contact piece mounting portion by the presser spring.