JPH066435Y2 - Movable contact support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a support device for a movable contact piece of a small switch, and more particularly, to a movable terminal on a common terminal integrally formed with a receiving portion and a terminal portion. The present invention relates to a support device for a movable contact piece of a switch in which a piece is placed and the movable contact piece is tilted left and right to open and close.

(Prior Art) Conventionally, in this type of small switch, the movable contact piece has a flat plate shape, and when the switch is switched by the seesaw movement, chattering occurs in the receiving part and the movable contact piece, and the life is long for a high current capacity. There was a shortcoming that it was short.

Therefore, various supporting devices for the movable contact piece have been devised in order to eliminate this drawback.

For example, as shown in FIG. 7, vertical grooves 1-1 are formed on the opposite wall surfaces in the case 1 from the upper end to a predetermined length,
A flat plate-shaped common terminal 6 is provided between the vertical grooves 1-1. The common terminal 6 has an upper end portion 6-1 protruding in the case and a recessed engagement portion 6-2 provided on both side edges thereof. The movable contact piece 7 is placed on the projecting upper end portion 6-1 and a pair of leg pieces 7-1, 7- having elastic force is applied from both sides of the central portion of the movable contact piece 7.
1'extends downward and is configured to sandwich both side edges of the projecting upper end portion 6-1 in a state of being loosely fitted in each of the vertical grooves 1-1. (Refer to Japanese Utility Model Publication No. 57-4751) (Problems to be solved by the invention) As described above, the movable contact piece 7 sandwiches the common terminal 6 and supports it so as to prevent chattering. In order to enable swinging, the leg pieces 7-1 of the movable contact piece 7 are loosely fitted in the vertical grooves 1-1 formed on the inner surfaces of the case 1 which face each other,
Due to the elasticity of the leg piece, the movable contact piece 7 is supported so as not to fall off from the common terminal 6 by sandwiching the both side edges of the common terminal 6, so that the leg piece 7-1 of the movable contact piece 7 of the case 1 Since there is contact friction with the inner wall, contact pressure is lost at that portion to make the contact unstable, and further, the inner wall of the case 1 is shaved and powder is scattered, resulting in poor contact. In addition, it is necessary to form a vertical groove on the inner wall of the case 1,
There is a problem that the mold becomes complicated and expensive.

Therefore, in view of the above situation, an object of the present invention is to provide a supporting device for a movable contact piece, in which the common terminal press-contacts the movable contact piece to prevent chattering, and the contact is stable and which is inexpensive. is there.

(Means for Solving the Problems) A supporting device for a movable contact piece of a switch according to the present invention is provided with a receiving part in the center of a case, and fixed contacting parts are arranged on the left and right sides of the receiving part. In a switch that mounts a movable contact piece on a receiving portion and tilts the movable contact piece to the left and right to open and close an electric path, a common terminal that integrates the receiving portion and the terminal portion is formed of an elastic plate,
A recess is provided in the center of the receiving part, and an upright part with a tongue is provided on the side of the recess, the movable contact piece is placed in the recess, and the center of the movable contact piece is formed. A pair of ear pieces is projected on the side surface of the portion, and the tongue piece is pressed against the inner surface of the ear piece.

(Operation) According to the support device for the movable contact piece of the switch of the present invention,
When the switching element 15 slides on the movable contact piece 14 to open and close the electric path, the movable contact piece 14 is placed on the common terminal 12, and the rising portions 12-2, 12-at the upper end portion of the common terminal 12 are placed. 2'is a movable contact piece
A pair of ear pieces 14-1, 14- protruding from the side surface of the central portion of 14
The fixed contact pieces 13 and 13 'and the movable contact piece 14 are opened and closed while the inner surface of 1'is always pressed against the tongue pieces 12-3 and 12-3'.

(Embodiment) FIG. 1 is a front sectional view of a switch according to the present invention, FIG. 2 is a perspective view of the switch according to the present invention, FIG. 3 is a plan view of essential parts according to the present invention, and FIG. FIG. 5 is an explanatory view of the movable contact piece supporting device, and FIG. 5 is a perspective view of an essential part of the movable contact piece supporting device of the present invention.

In these figures, 11 is a case having an opening on the upper surface, 12 is a common terminal, and 13 and 13 'are fixed contact pieces.
Three rectangular through holes are provided on the inner bottom surface of 11, the common terminal 12 is inserted into the central through hole, and the fixed contact pieces 13 and 13 'are inserted and fixed in the left and right through holes, respectively. The common terminal 12 is formed of an elastic plate, and has a recess 12-1 for receiving the movable contact piece 14 at the upper end and standing portions 12-2, 12-at the side of the recess 12-1.
2'is provided. Further, the standing portions 12-2 and 12-2 'are cut out to form elastic tongue pieces 12-3 and 12-3'. In this embodiment, the tongues 12-3 and 12-3 'are alternately projected on both sides, but they may be projected in the same direction.

On the other hand, the movable contact piece 14 is placed in the recess 12-1 formed in the upper end portion of the common terminal 12. A pair of ear pieces 14-1 and 14-1 'are formed on the side of the central portion of the movable contact piece 14 so as to project therefrom, and the upright portion 12-2 of the upper end portion of the common terminal 12 is formed by these ear pieces. , 12-2 '.

Therefore, the engagement state between the common terminal 12 and the movable contact piece 14 is changed to the fourth state.
Explaining in detail with reference to FIG. 5 and FIG. 5, the upright portions 12-2 and 12-2 ′ in FIG. 5 are held by the ear pieces 14-1 and 14-1 ′ and the upright portion 12-2 and 12-2 'is cut out and bent in the thickness direction in a dogleg shape to form tongues 12-3 and 12-3'. The diagonal inner surfaces of the ear pieces 14-1 and 14-1 'are formed. Pressed. When the movable contact piece 14 makes a seesaw motion in such a state, the common terminal 12 formed of an elastic plate bends in XX 'and slides on the fixed contact pieces 13, 13' which come into contact with the tip of the movable contact piece 14. By the self-cleaning action, a switch with stable contact can be obtained.

A cover 16 made of metal, for example, is attached to the opening of the case 11, and a lower end of the sleeve 17 with an external thread is fixed to a circular hole at the center of the upper surface of the cover 16. Therefore, the handle 18 is inserted into the sleeve 17 so as to project vertically, and the pin 20 is inserted with the coil spring 19 interposed in the cylinder opening to the lower portion of the handle 18, and the movable contact piece is attached to the lower end of the pin 20. A converter 15 is provided for moving the 14 into a seesaw motion. Long guide holes on the left and right of the top surface of the cover 16 to guide the left and right movements of the handle 18.
21 is provided and the cylindrical portion below the enlarged portion 18-1 is inserted.

Next, another embodiment will be described.

FIG. 6 is a perspective view of a common terminal showing another embodiment. The common terminal 12 shown in FIG. 6 is formed of a single elastic plate, and upright portions 12-2 and 12-2 'are provided diagonally.
-2, 12-2 'notch-shaped bent tongue 12-
The common terminal 12 is formed by folding the center terminals 3 and 12-3 'from the center. Further, standing portions 12-2, 12-2 'and tongue pieces 12-3, 12-3' are provided symmetrically on both sides in the developed view, and the inner surfaces of the ear pieces 14-1, 14-1 'of the movable contact piece 14 are You may press them together.

(Effect of the Invention) According to the present invention, a receiving portion is received in the central portion of the receiving portion, a standing portion provided with a tongue piece is formed on a side portion of the receiving portion, and the movable contact piece is placed in the recess portion. At the same time, a pair of ears are projected on the side surface of the central part of the movable contact piece, and the tongue piece is pressed against the inner surface of this ear piece, so not only chattering is prevented but also movable contact caused by shock or vibration of the equipment. It is possible to obtain an excellent movable contact piece supporting device that prevents the pieces from falling off.

Further, since the movable contact piece and the common terminal are engaged with each other in a concavo-convex manner and the common terminal is formed of the elastic plate, the tip of the movable contact piece slides on the fixed contact piece with the seesaw movement of the movable contact piece, and self-cleaning is performed. By the action, a small switch with stable contact can be provided. Further, the tongue pieces provided on the upright portions of the inner surfaces of the pair of ear pieces projecting from the side surfaces of the central portion of the movable contact piece are elastically engaged with each other by projections and depressions, so that the assembling workability is good and the movable contact piece can be detached due to vibration or impact. Therefore, it is suitable for automatic assembly.

[Brief description of drawings]

FIG. 1 is a front sectional view of a switch according to the present invention, FIG. 2 is a perspective view of the switch according to the present invention, FIG. 3 is a plan view of relevant parts of the present invention, and FIG. 4 is a movable contact piece of the present invention. 5 is a perspective view of an essential part of a support device for a movable contact piece of the present invention, FIG. 6 is a perspective view of a common terminal showing another embodiment of the present invention, and FIG. 7 is a conventional view. 3 is a perspective view of a main part of the switch of FIG. 11 ... Case, 12 ... Common terminal, 12-1 ... Recess, 12-
2, 12-2 '... Standing part, 12-3, 12-3' ... Tongue piece,
13, 13 '... Fixed contact piece, 14 ... Movable contact piece, 14-1, 14-
1 '... earpiece

Claims (1)

[Scope of utility model registration request] 1. A receiving portion is provided in a substantially central portion of a case, fixed contact pieces are disposed on the left and right sides of the receiving portion, a movable contact piece is placed on the receiving portion, and the movable contact piece is moved to the left and right. In a switch that tilts to open and close an electric path, a common terminal in which the receiving portion and the terminal portion are integrated is formed of an elastic plate, a recess is provided in the center of the receiving portion, and a side portion of the recess is cut out. And a standing portion formed with an elastic tongue is provided, the movable contact piece is placed in the recess, and a pair of ear pieces is projected on the side surface of the central portion of the movable contact piece, and the inner surface of the ear piece is A support device for a movable contact piece, characterized in that the tongue pieces are pressed against each other.