JPH0735238Y2 - Ultra small push switch - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to miniaturization and drip-proofing of a push switch.

"Problems to be solved by the conventional technology and device" Obtain an ultra-compact compact push switch with ON / OFF current of DC2A, size 5-6mm square, length 11-13mm or less. It was difficult. Recently, along with the drastic downsizing of electronic devices, there has been a strong demand for the downsizing of push switches to the above dimensions.

Further, the conventional small push switch has a drawback that moisture and water droplets penetrate into the inside of the switch from the front side to be pushed, and the reliability of the switch is deteriorated.

The present invention has been made in view of such circumstances, and its purpose is to make the push switch ultra-miniaturized and drip-proof.

"Means for Solving the Problems" This invention is a microminiature push switch including a body, a slider, a ring, an insulator, a fixed contact piece, a movable contact piece, a coil spring, and a back cover. is there.

The body is formed of a synthetic resin into a box shape with an open back surface, an opening formed in the upper surface thereof, a slider insertion hole formed substantially in the front surface, and an insulator member formed on the bottom surface. A stop hole, a cover locking hole formed on the peripheral surface, a pair of movable contact piece insertion grooves and a pair of fixed contact piece insertion grooves formed in the lower and upper ends of the inner surfaces of both side walls facing each other in the front-rear direction. Have.

The fixed contact piece and the movable contact piece are formed by bending the ends of two opposite sides of a planar U-shaped metal plate by bending them at a substantially right angle to form a contact portion, and integrally forming a terminal from the other side. The contact portion of the movable contact piece faces the contact portion of the fixed contact piece by being inserted and held in the contact piece insertion groove of the body.

The insulator is made of synthetic resin and has a rectangular front plate with a slider insertion hole formed in the center, and an upper plate that extends rearward from the upper end of the front plate at a substantially right angle and closes the upper opening of the body. , A lower plate extending rearward from the central portion of the lower end of the front plate at a substantially right angle, and a lower surface of the extended end provided with a locking claw that engages with the insulating locking hole of the body. It is constructed and is coaxially attached to the body, and holds the ring between the body and the slider so as to be movable back and forth between the upper plate and the lower plate.

The slider is made of synthetic resin, and is composed of a cylindrical portion, a flange portion formed at the rear end of the cylindrical portion, and a small diameter portion provided coaxially with the rear surface of the cylindrical portion. The slider is inserted into the slider insertion hole formed in each of the insulator and the body.

The ring is made of rubber and is sandwiched between the front surface of the body and the front plate of the insulator, and the cylindrical portion of the slider is fitted in the center hole of the ring.

The back cover is made of a synthetic resin and has a rectangular parallelepiped shape. It is formed in the center of the front surface and has a cylindrical recess for accommodating and holding the coil spring. Has a pawl.

The coil spring is mounted around the small diameter portion of the slider, accommodated and held in the cylindrical recess of the back cover, and presses the cylindrical portion of the slider so that the front end of the slider projects from the front surface of the body. By doing
The flange portion of the slider brings the contact portion of the movable contact piece into contact with the contact portion of the fixed contact piece.

By moving the slider rearward against the biasing force of the coil spring, the electrical connection between the contact pieces is released.

[Embodiment] As shown in the embodiment of FIGS. 1 and 2, the microminiature push switch of the present invention comprises a body 1, a slider 2, a ring 3, an insulator 4, and a fixed contact piece 5. , The movable contact piece 6,
It is composed of a spacer 7, which is used as necessary, a back cover 8 and a coil spring 9. An insulator 4 is attached to the body 1, and a ring 3 is sandwiched between them. Double-sided piece
Reference numerals 5 and 6 are inserted and held in insertion grooves formed in the front-rear direction at the upper and lower ends of the inner surfaces of both side walls of the body 1. The slider 2 is inserted into a slider insertion hole formed in the shaft center of the body 1 and the insulator 4, and the front end of the slider 2 is biased by the coil spring 9 so as to project from the front surface of the body 1.
A back cover 8 is attached to the switch, and a coil spring 9 is housed and held in a cylindrical recess 8a thereof. Hereinafter, these components will be described in detail in order.

As shown in FIG. 3, the body 1 is made of synthetic resin and is formed into a box-like shape with its back surface opened. An opening 1a is formed on the upper surface, and a slider insertion hole 1b is formed at the center of the front surface. In this example, a ring-shaped protrusion is placed around the slider insertion hole 1b on the front surface.
1c is provided. An insulator locking hole 1d is formed at the center of the bottom surface of the body 1. Cover engaging holes 1e, 1f, and 1g are formed on the peripheral surface of the body, that is, the bottom surface and both side surfaces.
A pair of movable contact piece insertion grooves 1h, 1i and a pair of fixed contact piece insertion grooves 1j, 1k are formed in the front-rear direction at the lower end and the upper end of both side walls of the body so as to face each other.

The opening 1a on the upper surface of the body is composed of a cover engaging recess 1 in which the upper end wall of the rear end is completely removed, and a cross-shaped insulator engaging recess 1m in front of the cover engaging recess 1.

As shown in FIG. 4, the fixed contact piece 5 is formed by bending the front ends of the two opposite sides 5a and 5b of the planar U-shaped metal plate 5k downwardly at a right angle to extend the contact points 5d and 5e. The terminal 5f is formed on the rear side of the other side 5c of the U-shape. Contact part
The plate surfaces of 5d and 5e are punched backward in a convex shape to serve as contacts.

As shown in FIG. 5, the movable contact piece 6 is formed by bending the front ends of the two opposite sides 6a and 6b of the planar U-shaped metal plate 6k so as to extend upward at a substantially right angle so that the contact portions 6d and 6e are formed. The edge of the other side 6c on the side 6b side is bent upward at a substantially right angle and extended upward, and the terminal 6e is provided behind the extended end of the extended portion 6d.
Is projected.

The fixed contact piece 5 has two opposite sides 5a, 5 as shown in FIG.
b is inserted into the fixed contact piece insertion grooves 1j and 1k from the back side of the body 1 and held therein. The movable contact piece 6 has one side
Both ends of 5c are movable from the back side of the body 1 Contact piece insertion groove 1h, 1i
(Fig. 3) Inserted and held in the contact part 6 of the movable contact piece
d and 6e are arranged so as to face the back side of the contact portions 5d and 5e of the fixed contact piece.

The insulator 4 is made of synthetic resin, and as shown in FIG. 6, a square front plate 4b having a slider insertion hole 4a in the center,
A cross-shaped upper plate 4c that extends rearward from the upper end of the front plate 4b at a right angle and closes the top opening 1a of the body, and a lower plate that extends rearward at a substantially right angle from the center of the lower end of the front plate 4b. It is composed of 1d and a roughly U shape. The distance between the upper plate 4c and the lower plate 4d is made substantially equal to the diameter of the slider insertion hole 4a, and the slider 2 is held so that it can move back and forth. On the lower surface of the extended end of the lower plate 4d, a locking claw 4e that engages with the insulator locking hole 1d of the body is projected.
As shown in FIG. 1, the insulator 4 has the engaging claw 4e engaged with the insulator engaging hole 1d of the body, and the upper plate 4c engaged with the insulator engaging recess 1m of the opening 1a of the body, respectively. It is mounted coaxially with respect to 1. That is, the slider insertion hole 4a of the insulator 4 is located coaxially with the slider insertion hole 1b of the body. The insulator 4 is especially provided for holding the ring 3 between the front surface portion of the body 1.

The slider 2 is made of a synthetic resin, and as shown in FIG. 7, a cylindrical portion 2a extending in the front-rear direction and a pair of protrusions extending in opposite directions at substantially right angles from the peripheral surface of the rear end of the cylindrical portion 2a. The flange portion 2b and the rear surface of the cylindrical portion 2a are coaxially projected from the rear surface,
It is composed of a small diameter portion 2c having a diameter smaller than that of the cylindrical portion 2a.
As shown in FIG. 1, the slider 2 has a cylindrical portion 2a from the rear side of the body 1 to the insulator 4 and the slider insertion hole of the body 1.
It is inserted in 4a and 1b, and is held between the upper plate 4c and the lower plate 4d of the insulator 4 so as to be movable back and forth.

The ring 3 is made of rubber and is sandwiched between the front surface of the body 1 and the front plate 4b of the insulator as shown in FIG. 1, and the cylindrical portion 2a of the slider 2 is fitted in the center hole of the ring. The ring 3 is especially provided in order to prevent moisture or water droplets from entering the inside of the body through the gap between the cylindrical portion 2a of the slider and the slider insertion hole 1b of the body 1.

The spacer 7 is made of a synthetic resin in a sheet shape, and has substantially the same outer shape as the U-shaped metal plate 5k of the fixed contact piece 5 as shown in FIG. And the fixed contact piece insertion groove 1 of the body 1 as shown in FIG. 1B.
Inserted at j, 1k. The spacer 7 is the contact portion 6d, 6 of the movable contact piece.
This is to prevent the tip of e from coming into contact with the fixed contact piece 5.

The back cover 8 is made of synthetic resin and has a rectangular parallelepiped shape as shown in FIG. A cylindrical recess 8a for accommodating and holding the coil spring 9 is formed in the center of the front surface thereof, and engagements for engaging with the cover locking holes 1f, 1g and 1e of the body 1, respectively, on the peripheral surface, that is, both side surfaces and the bottom surface. The claws 8b, 8c and 8d are provided so as to project. A terminal lead-out hole 8e for the fixed contact piece is formed through the center of the upper end of the cover 8 in the front-rear direction, and a terminal lead-out recess 8f for the movable contact piece is formed on the side surface of the cover. On the inner surface of the cover, the peripheral portion 8g except the upper portion of the cylindrical recess 8a is projected forward, and the corners on both sides of the lower end of the peripheral portion are chamfered to form slopes 8h and 8i. The upper end of the peripheral portion 8g has a cylindrical recess 8
It is a horizontal plane that intersects with the upper end of the inner peripheral surface of a, so that a part of the inner peripheral surface is cut out to form a slit 8j.
The upper front surface 8k (FIG. 9B) of the cover 8 also has a function of holding the fixed contact piece 5, the spacer 7 and the insulator 4 mounted on the body 1.

The coil spring 9 is attached around the small diameter portion 2c of the slider 2 as shown in FIG.
The slider flange portion 2b is housed in and held by the slider 8a so that the front end of the slider 2 projects from the front surface of the body 1 so that the flange portion 2b of the slider contacts the contact portion 6 of the movable contact piece.
The d and 6e are brought into contact with the contact points 5d and 5e of the fixed contact piece, respectively.
When the slider 2 is displaced rearward against the biasing force of the coil spring 9, the electrical connection between the contact pieces 5 and 6 is released. Therefore, both contact pieces are always closed.

The position of the front surface of the flange 2b on the left and right of the slider is slightly shifted, the height of the fixed contact piece 5d, 5e to the rear is stepped, or the shape of the movable contact piece 6d, 6e is changed. It is also possible to prevent the deterioration of the contact portion due to arc discharge by giving a slight time difference to the time when the left and right two contacts are turned on or off by appropriately deforming. Further, in order to extend the life of the switch, a contact material may be welded to the contact portions of both contact pieces.

[Advantage of Invention] In the push switch of this invention, an insulator 4 is coaxially attached to a body 1, and a ring 3 is sandwiched between them. Fixed and movable contact pieces 5, 6 are inserted and held in the contact piece insertion grooves on the inner surfaces of both side walls of the body 1. The slider 2 is inserted into a slider insertion hole formed in the shaft center of the body 1 and the insulator 4, and is held by the insulator 4 so as to be movable back and forth.
As a result, the front end of the slider 2 is biased so as to project from the front surface of the body 1. A back cover 8 is attached to the switch, and a coil spring 9 is housed and held in a cylindrical recess 8a thereof. In this way, the switch of this invention has a small number of parts,
Since the parts are relatively simple in shape and the structure is easy to assemble, a very small push switch can be realized.

The ring 3 is sandwiched between the body 1 and the insulator 4, and is closely attached to the outer peripheral surface of the slider 2. Therefore, it is possible to sufficiently prevent the ingress of moisture or water droplets through the slider insertion hole of the switch, and greatly improve the reliability of the connection. it can. Further, since the fixed and movable contact pieces have two contact points, the reliability of the connection is improved accordingly.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and A is a second
A sectional view taken along the line AA of FIG. B, B is a sectional view taken along the line BB of A (D- of C
The same as the D sectional view), C is a sectional view taken along the line CC of B, FIG. 2 is a view showing the outer shape of the embodiment of FIG. 1, A is a plan view, B is a left side view, and C is a front view. D is a right side view, E is a bottom view, FIG. 3 is a view showing the body 1 of FIG. 1, A is a plan view, B is a left side view, C is a front view, D is a right side view, and E is Bottom view, F is B
4 is a sectional view taken along line AA of FIG. 4, and FIG. 4 is a view showing the fixed contact piece 5 of FIG. 1, where A is a front view, B is a right side view, C is a bottom view, and FIG. 5 is the movable contact of FIG. In the figure which shows piece 6, A is a top view, B is a front view, C is a right side view, FIG. 6 is a figure which shows the insulator 4 of FIG. 1, A is a plan view, B is a left side view, C is a front view, D is a right side view, E is a bottom view, FIG. 7 is a view showing the slider 2 of FIG. 1, A is a plan view, B is a front view, C is a right side view, and FIG. 1 is a plan view of the spacer 7 of FIG. 1, FIG. 9 is a view showing the back cover 8 of FIG. 1, A is a plan view, B is a left side view, C is a front view, D is a right side view, E Is a bottom view and F is a rear view.

Claims (1)

[Scope of utility model registration request] 1. A microminiature push switch comprising a body, a slider, a ring, an insulator, a fixed contact piece, a movable contact piece, a coil spring, and a back cover, wherein the body is a composite. A resin is formed into a box shape with an open back surface, an opening formed in the top surface, a slider insertion hole formed in the front surface at the center, an insulator locking hole formed in the bottom surface, and a peripheral portion. A cover locking hole formed in the surface, a pair of movable contact piece insertion grooves and a pair of fixed contact piece insertion grooves formed in the front and rear directions facing each other at the lower and upper ends of the inner surfaces of both side walls, The fixed contact piece and the movable contact piece are formed by bending the protruding ends of two opposite sides of a flat U-shaped metal plate at a substantially right angle to form contact points, and integrally forming terminals from the other side. , Is inserted and retained in the contact piece insertion groove of the body, and The contact parts of the moving contact pieces are opposed to each other.The insulator is made of synthetic resin and has a rectangular front plate with a slider insertion hole in the center and a right angle behind the upper end of the front plate. And an upper plate that closes the upper opening of the body and extends at a substantially right angle rearward from the central portion of the lower end of the front plate, and engages with the insulator locking hole of the body on the lower surface of the extended end. A lower plate provided with a locking claw that is fitted to the body, is coaxially attached to the body, holds the ring between the body and the slider between the upper plate and the lower plate. The slider is made of synthetic resin, and has a cylindrical portion, a flange portion formed at the rear end of the cylindrical portion, and a small diameter portion projecting coaxially from the rear surface of the cylindrical portion. And the cylindrical portion is formed on the insulator and the body, respectively. The ring is made of rubber and is sandwiched between the front surface of the body and the front plate of the insulator, and the cylindrical portion of the slider is fitted in the center hole of the ring. The back cover is made of synthetic resin and is formed into a rectangular parallelepiped shape. The back cover is formed in the center of the front surface and has a cylindrical recess for accommodating and holding the coil spring. The coil spring is fitted around the small diameter portion of the slider and is housed and held in the cylindrical recess of the back cover, and the front end of the slider is attached to the body. By pressing the cylindrical part of the slider so that it projects from the front surface,
The flange portion of the slider abuts the contact portion of the movable contact piece with the contact portion of the fixed contact piece, and the slider is rearwardly displaced against the biasing force of the coil spring. Ultra-compact push switch that releases the electrical connection between the contact pieces.