SU860162A1 - Push-button switch - Google Patents

Description

(54) BUTTON SWITCH

one

The invention relates to electrical engineering and is intended for switching electrical and radio circuits, in particular, can be used as a switching device of small-sized dial-ups intended for entering digital information into various electronic devices.

Known pushbutton switches are used as a switching device in field floors, which contain a board and an enclosure mounted on it, in the window of which a button is placed that is spring-loaded with an external spring. An additional contact spring is mounted on the board to provide contact in a button switch inside said external spring. To increase the reliability of mounting both springs, there are centering grooves l} on the board.

However, the presence of an additional spring in the centering grooves complicates the switch assembly technology.

In addition, an additional contact spring is attached to the board with only one bent coil, which reduces the reliability of its fixation, especially under shock and vibration loads, and leads to the issuance of spurious signals.

The closest in technical essence to the present invention is a push-button switch comprising a printed circuit board and a housing mounted thereon with at least one window in which a button is placed, spring-loaded with a contact conical twisted spring, the portion of which with a large diameter constantly contacts the printed board, and a plot with a smaller diameter is installed with the ability to interact with it when you act on the button G2.

However, the presence of the plunger connected to the button complicates the design

ichpes IHoro gg switch and did not allow iiCT to reduce the size, since dl). the work of the conical contact Moii springs must be retained by its “certain constructive parameters”. In addition, such a form of a conical spring does not ensure the creation of a constant contact pressure, which adversely affects the stability of the value of contact resistance and, consequently, the reliability of the device as a whole.

The purpose of the invention is to reduce the size and increase reliability by stabilizing the contact resistance of the contacts.

This goal is achieved by the fact that, in a well-known push-button switch, a section of a spring with a smaller diameter is concave inside the spring and faces its section with a larger diameter, the inner surface of the button is made in the form of a truncated cone, the lateral surface of which is guided by a spring button.

Fig. 1 shows a button switch, a slit; Fig 2 is the same when the button is pressed.

The pushbutton switch consists of 1 orbit 1 mounted on a printed circuit board 2. In the case opening there is a push button 3, spring-loaded with a conical twisted spring 4, the portion of which with a smaller diameter is bent inward and facing the portion with a larger diameter. The larger diameter of the spring rests on the ring current-carrying contact 5 of the printed circuit board 2. Along the axis of the spring 4 on the printed circuit board 2 a second contact 6 is located. The inner surface of the button 3 is made in the form of a truncated cone, the lateral surface of which is a guide for the spring 4, B open (top) button position

3 between the section with the smaller diameter of the spring 4 and the contact 6 there is the zone with the large diameter of the spring

4 can be soldered to the ring current-conducting contact 5 to reduce the transient resistance of the push-button switch.

The device works as follows.

When nahsatiy on button 3, the compression of the spring 4, the section with a smaller

the diameter of the spring touches contact 6 and closes the electrical circuit between contacts 5 and 6 through the spring 4. When the button is moved downwards, compression

springs 4. At the end of the stroke the button 3 with its conical surface sits on the lateral surface of the spring 4. This ensures: a soft, unstressed stop of the button and good centering of the spring relative to the axis of the push-button switch. The contact pressure is carried out at the expense of a spring section with a smaller diameter facing in the direction of its section with

large diameter.

Claims (1)

Invention Formula A push button switch containing a printed circuit board and a housing mounted on it with at least one window in which the button is placed is spring-loaded with a contact conical twisted spring, the portion of which with a larger diameter constantly contacts the printed circuit board, and the portion with a smaller diameter is installed with the ability to interact with it when acting on a button, characterized in that, in order to reduce overall dimensions and increase reliability by stabilizing the transient resistance, a portion of said spring with a smaller d ametrom concave internal spring and turned toward its large diameter portion, the inner surface of the button is formed as a truncated cone side surface which is a guide for the spring upirayusch-eys in the button. Sources of information taken into account in the examination 1, US Patent No. 3773996, class, 200-159, 1973, 2, Patent of Germany No. 2247905, class, H 01 H 13/52, 1975, (rig 2