JPS5824345Y2 - push button switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push button switch, and in particular, it is an object of the present invention to provide a push button switch with good productivity, small size, and stable contact.

Conventional small pushbutton switches, such as microswitches,
As is well known from Japanese Patent Publication No. 47-41731, in order to ensure reliable switching between the normal contact (NC) side and the normally open (NO) side, it is necessary to provide a large gap between the fixed contact piece and the movable contact piece. Moreover, the movable contact piece becomes longer, the switch becomes thicker as a whole, and chattering is more likely to occur, resulting in unstable operation.

The purpose of the present invention is to eliminate such conventional drawbacks.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings. Reference numeral 1 denotes a base made of an insulating synthetic resin, and the base has a recess 1a in the center, holes 1b in the corners, lb and lc, lc
is provided.

Reference numeral 2 is a common fixed contact piece that is embedded in the base 1 and has a contact portion 2a exposed at the bottom corner of the recess 1a, and a terminal portion 2b that projects outward from the base 1; A fixed contact piece having a contact part 3a exposed at the center of the bottom surface and a terminal part 3b protruding outward from the base 1, 4 is a movable contact piece made of a metal spring plate, and has a peripheral part 4a and a central bridging part 4b. and contact portions 4C provided opposite to each other on both sides of the central bridging portion 4b, and the entire movable contact piece 4 is curved by applying a drawing portion 4d to the peripheral portion 4a. The configured movable contact piece 4 is housed in the recess 1a of the base body 1 so as to be in constant contact with the common fixed contact piece 2.

Reference numeral 5 denotes an upper fixed contact piece made of a metal plate and having a contact part 5a that comes into contact with the contact part 4C of the movable contact piece, a bent terminal part 5b, and an insertion hole 5C through which the push button is inserted so as to be movable up and down; 6 is an insulating material. The push button 7 is made from an insulating material and has a push button insertion hole 7a in the center and a protrusion 7b on the lower surface. , place the upper fixed contact piece 5 on the top surface of the base 1, place the case 7 with the push button 6 attached on the upper fixed contact piece 5 so that the push button 6 passes through the insertion hole 5C, and then press the protrusion 7b of the case 7. After inserting the case 7 into the hole 1C of the base body 1, the case 7 is attached to the base body 1 by expanding the tip of the protrusion 7b by heat or the like, and the upper fixed contact piece 5 is sandwiched between the base body 1 and the case 7.

FIG. 2A shows a cross-sectional view of the pushbutton switch, which shows the pushbutton 6
is not pressed, and in this state, the movable contact piece 4
is bent upward, the peripheral part 4a contacts the common fixed contact piece 2, and the contact part 4C contacts the upper fixed contact piece 5, so that the common fixed contact piece 2 and the upper fixed contact piece 5 are in a short-circuited state. When the push button 6 is pressed in this state, the push button 6 presses the central bridging portion 4b of the movable contact piece 4, and as a result, the central bridging portion 4b moves in reverse after passing the dead center, and as shown in FIG. As shown in FIG.
contacts the fixed contact piece 3, and the fixed contact piece 3 and the common fixed contact piece 2 are brought into a short-circuited state.

In addition, when the push button 6 is released from the press in this state, the movable contact piece 4 performs a reverse movement due to its own return force and returns to its original state of contacting the upper fixed contact piece 5, and at the same time, the push button 6 is released. 6 is also returned to the state before being pressed by the movable contact piece 4.

Then, the movable contact piece 4 repeats the reversal movement by pressing and releasing the push button 6, and the movable contact piece 4 approaches and separates from the upper fixed contact piece 5 and the fixed contact piece 3, but first, the movable contact piece 4 When contacting the fixed contact piece 3, after the contact part 4C, which is elastic, contacts the bottom surface of the base body 1, the central bridging part 4b contacts the fixed contact piece 3, and the upper fixed contact piece 5 has elasticity. Since the contact part 4C comes into direct contact, when the movable contact piece 4 contacts the fixed contact piece 3, the contact part 4C, and when the movable contact piece 4 contacts the upper fixed contact piece 5, The central bridging portion 4b absorbs vibrations of the movable contact piece 4 that occur during contact, and chattering can be extremely reduced.

A base body having a common fixed contact piece and a recessed part in which a part of the fixed contact piece is exposed at the bottom thereof and in which the common fixed contact piece and the fixed contact piece are embedded, a peripheral part, and a drawing process provided on the peripheral part. It consists of a central bridging part curved by a part and contact parts provided opposite to each other on both sides of the central bridging part, and a part of the common fixed contact piece stored in the recessed part of the base body and exposed at the bottom of the recessed part. a metal plate upper fixed contact piece comprising a movable contact piece made of a metal spring plate with which the peripheral part is always in contact; a contact part arranged on the movable contact piece and abutting the contact part of the movable contact piece; and an insertion hole. and a push button movably inserted into the insertion hole of the upper fixed contact piece and disposed on the central bridging portion of the movable contact piece. Since the fixed contact piece and the upper fixed contact piece are brought into contact with and separated from each other,
It has a good space factor, is compact, and has good contact with little chattering. It can be assembled by sequentially incorporating the case 7 to which the movable contact piece 4, upper fixed contact piece 5, and push button 6 are attached to the base body 1. is completed, and the productivity is also good.

[Brief explanation of drawings]

Both of them show the push button switch of the present invention; FIG. 1 is an exploded perspective view, and FIGS. 2A and 2B are sectional views showing the operating state. 1... Base body, 1a... Concave portion, 2...
...Common fixed contact piece, 3...Fixed contact piece, 4...
...Movable contact piece, 4a...Peripheral part, 4b...
...Central bridging part, 4C...Contact part, 4d.
...Drawing part, 5...Top fixed contact piece,
5C...Insertion hole, 6...Push button, 7...
····Case.

Claims (1)

[Scope of utility model registration request] A base body having a common fixed contact piece and a recessed part in which a part of the fixed contact piece is exposed at the bottom thereof and in which the common fixed contact piece and the fixed contact piece are embedded, a peripheral part, and a drawing process provided on the peripheral part. A part of the common fixed contact piece, which is housed in the recess of the base body and exposed at the bottom of the recess, is made up of a central bridging part that is curved by a part and contact parts provided opposite to each other on both sides of the central bridging part. a movable contact piece made of a metal spring plate, the peripheral portion of which is in constant contact with the
a metal plate upper fixed contact piece that is disposed on the movable contact piece and includes a contact part that abuts the contact part of the movable contact piece and an insertion hole; A push button switch is comprised of a push button arranged on a central bridging part of a piece, and the movable contact piece is brought into contact with and separated from a fixed contact piece and an upper fixed contact piece by reversing movement of the movable contact piece by the push button.