JPH0239316Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field to which the invention pertains The invention relates to a small switch.
In particular, the present invention relates to a movable contact drop prevention device for a switch which opens and closes by tilting the movable contact piece placed on a common terminal integrally formed into a flat plate shape from side to side.

BACKGROUND ART Conventionally, a switch of this type has vertical grooves formed in opposing wall surfaces in a switch case piece over a predetermined length from the upper end, and a vertical groove corresponding to the pair of vertical grooves in the switch case. A flat terminal made of a conductive material held in a penetrating state through the bottom plate of the switch, and a flat terminal provided on both sides of the terminal located between the upper end of the terminal protruding into the case and the bottom plate of the switch case. a recessed engagement portion, a movable contact piece made of a conductive material whose longitudinal lower center portion is placed on the upper end surface of the terminal protruding inside the case, and a movable contact piece made of a conductive material that extends downward from both sides of the longitudinal center portion of the movable contact piece. a pair of leg pieces having an elastic force that sandwich both side edges of the protruding end portion of the terminal in the case when the terminal is loosely fitted into each of the vertical grooves; Japanese Utility Model Publication No. 57-4751 proposes a device for supporting a movable switch contact piece, which is provided with a locking portion that is engaged with the engaging portion of the terminal.

However, in this invention, the pair of legs of the movable contact piece tended to become entangled, resulting in deformation during the plating process and difficulty in assembling workability. In addition, in a switch in which a movable contact piece is placed on a receiving piece and is tilted like a seesaw to switch between open and closed states with respect to a fixed contact piece, the movable contact piece may bounce and cause chattering on the receiving piece. At this time, an arc may fly, damaging the contact portion or causing an increase in contact resistance.

Purpose of the invention The present invention was made in view of the above-mentioned conventional circumstances.Therefore, the purpose of the present invention is to eliminate the above-mentioned drawbacks, and also to meet the trend of miniaturizing switches due to the miniaturization of equipment. A flat common terminal is provided in which a piece and a terminal are integrally formed, and the movable contact piece placed on the receiving piece is brought into reliable contact with the movable contact piece, and is easy to assemble, and the movable contact piece does not fall off from above the receiving piece. An object of the present invention is to provide a new movable contact piece falling-off prevention device that can be supported reliably.

Structure of the Invention In order to achieve the above object, the movable contact piece falling-off prevention device according to the present invention includes a common terminal in which a receiving piece and a terminal are integrally formed in a flat plate shape, and a common terminal is inserted into the bottom of a switch case. A support plate is provided in the center with a rectangular hole that can be received at the front and back sides, has elasticity on the front and back sides, is bent inward, and has a plurality of rising surfaces that are bent further inward at the top. The support plates are arranged on the left and right sides of a receiving piece having a recess, and the upright surfaces of the support plates are configured to hold the movable contact piece.

Embodiments of the Invention Next, preferred embodiments of the present invention will be specifically explained with reference to the drawings.

1 to 4 showing one embodiment of the present invention, FIG. 1 is a front cross-sectional view of a switch constructed by applying one embodiment of the present invention, and FIG. 2 is a lower half of the switch. FIG. 3 is an exploded perspective view of the present invention, and FIG. 4 is a perspective view of essential parts of the present invention.

Three rectangular through holes are provided on the inner bottom surface of the case 1 which has an opening on the top surface, and the fixed contact piece 2a and the terminal 2 are provided with three rectangular through holes.
The contact terminals 2 are inserted into the left and right sides of the rectangular through hole, and the receiving piece 3a and the terminal 3b are integrally formed into a flat plate shape to form the common terminal 3. The common terminal 3 is inserted into a central through hole provided on the inner bottom surface of the case 1. A rectangular hole 4a is provided in the lower part of the receiving piece 3a, which is received by the stepped part 3c of the receiving piece 3a, and has elasticity on the front and rear sides, is bent inward at an acute angle, and the upper part is further bent inward. A supporting plate 4 having a plurality of rising pieces 4b formed thereon is attached, and the receiving piece 3a is arranged and fixed higher than the left and right fixed contact pieces 2a, 2a.

Receiving piece 3a is plate-shaped and has a recess 3d formed in the center.
A lug piece 5a is formed to sandwich the protrusion 3e on the front and rear sides, and the plate-shaped movable contact piece 5 is attached to the rising piece 4b of the support plate 4.
It is placed between the wheels and can be tilted left and right.

A cover 6 made of metal, for example, is attached to the opening of the case 1, and the lower end of an externally threaded sleeve 7 is fixed to a circular hole in the center of the top surface.

A handle 8 is inserted into the sleeve 7 so as to protrude upward and downward, and a central enlarged portion 8a of the handle 8 is irremovably engaged with the inner upper surface of the sleeve 7. A pin 10 is inserted into the lower cylindrical portion of the handle 8 with a spring 9 interposed therebetween, and the lower end of the pin 10 is inserted into a converter 11. In order to guide the left and right movement of the handle 8, a long guide hole 6a is formed in the upper surface of the cover 6 in the left and right directions, into which the lower cylindrical portion of the handle 8 is inserted.

During operation, when the handle 8 is tilted from the right side to the left side in FIG.
The converter 11 slides on the upper surface and passes over the receiving piece 3a, and at the same time, the lug 5a of the movable contact piece 5 slides against the rising piece 4b bent inside the support plate 4, and the movable contact piece 5 is tilted to the right to change the switch.

FIG. 5 is an enlarged perspective view of a main part showing a modified embodiment of the support plate according to the present invention. There are two rising pieces 4b of the support plate diagonally on the left and right of the receiving piece 3a, that is, one on the front and one on the front.
They are deployed one by one.

FIG. 6 is an enlarged perspective view of main parts showing still another modification of the support plate according to the present invention. In this modification, the upper end of the rising piece 4b of the support plate 4 is provided with a protrusion 4c instead of being bent inward. The movement of the movable contact piece 5 is restricted by this protrusion 4c.

In the above embodiments, the present invention is applied to a toggle switch, but the present invention is not limited to toggle switches, and can be similarly applied to push button switches and other various devices.

Functions and Effects of the Invention The present invention is constructed as described above.According to the invention, a rectangular hole is provided, the front and rear sides have elasticity,
A supporting plate formed with a plurality of rising pieces bent inward and further bent inward at the upper part or provided with a protrusion integrates a flat receiving piece with a recess in the center and a terminal. The rising pieces of the support plate are placed on the left and right sides of the formed common terminal, and the movable contact piece is held between the movable contact pieces. This has the effect of preventing accidents such as falling off.

When the movable contact piece placed on the receiving piece is tilted, the rising piece of the support plate clamps the ear piece of the movable contact piece with an appropriate force, which not only prevents the movable contact piece from falling off, but also prevents the movable contact piece from falling off when changing the switch. The movable contact piece does not bounce due to vibration etc.
The receiving piece and the movable contact piece are always in an electrically conductive state, preventing arcing and preventing damage to the receiving piece and the movable contact piece. Therefore, a switch with a long life can be provided.

The lug of the movable contact piece placed on the receiving piece is held by a plurality of rising pieces having the elasticity of the support plate, bent inward, and the upper part further bent inward, or provided with a protrusion. Therefore, the movable contact piece can be installed inside the case without falling off due to vibration during assembly, which has the effect of facilitating automatic assembly.

A support plate with a rectangular hole, elasticity on the front and rear sides, bent inward, and a plurality of rising pieces formed by bending the upper part further inward or by providing a protrusion is made into a flat plate. Since it can be provided at the same time as the common terminal, it is possible to provide a movable contact piece fall prevention device that is simple and easy to assemble.

In order to respond to the miniaturization of equipment, the receiving piece and the terminal are integrally formed to form a flat common terminal, and the supporting plate with the rising piece is small and prevents the movable contact piece from falling off due to vibration etc. We can provide an excellent small switch with no chattering.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the present invention, of which Figure 1 is a front sectional view of the invention, Figure 2 is a plan view of the lower half of the invention, and Figure 3 is a plan view of the lower half of the invention. FIG. 4 is an enlarged perspective view of the main parts of the present invention.
FIG. 5 is an enlarged perspective view of a main part showing a modified embodiment of the present invention, and FIG. 6 is an enlarged perspective view of a main part showing still another modification of the present invention. 1... Case, 2... Contact terminal, 2a... Fixed contact piece, 2b... Terminal, 3... Common terminal, 3a...
Receiving piece, 3b...terminal, 3c...step, 3e...protrusion, 3d...recess, 4...support plate, 4a...hole,
4b...Rising piece (surface), 4c...Protrusion, 5...
Movable contact piece, 5a...Ear piece, 6...Cover, 7...Sleeve, 8...Handle, 9...Coil spring, 10...
...Pin, 11...Transformer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a switch in which a movable contact piece with ears is placed on a receiving piece with a recess provided in the case, and the movable contact piece is opened and closed by tilting the movable contact piece from side to side. , the receiving piece and the terminal are integrally formed into a flat plate shape to form a common terminal, a rectangular hole is formed to be received by the stepped part of the common terminal, and has elasticity on the front and rear sides, and has a U-shape. A support plate is formed by providing a rising piece that is bent and further bent inward at its upper part, and the rising pieces of the support plate are arranged on the left and right sides of the receiving piece that is flat and has a recess in the center, A device for preventing falling off of a movable contact piece, characterized in that projections on both sides of the receiving piece are sandwiched between ears of the movable contact piece, and a rising piece of the support plate presses against a side surface of the movable contact piece. (2) The movable contact piece falling-off prevention device according to claim (1), further characterized in that rising pieces of the support plate are arranged on the front, rear, left and right sides of the receiving piece. (3) Utility model registration claim No. (1) further characterized in that instead of bending the upper part of the rising piece inward, a protrusion is provided on the upper inner side of the rising piece.
The movable contact piece falling-off prevention device described in paragraph (2).