DE2302699A1 - ELECTRIC PUSH BUTTON SWITCH - Google Patents

Description

Dr. Gertrud Hauser βοοο Manchen 6ο, January 15, 1973 Dipl.-Ing. Gottfried Leiser ι «.β« 9 · γ · ιι · μ · ι »

Phone: 83 15 10 23026 ""

Portehtdkontoi Munich 117078 ^{fc v} Our sign; P 2195

PLESSEY HANDEL UND INVESTMENTS AG
6300 Zug, Switzerland
Gartenstrasse 2

Electric push button switch

The invention relates to an electric push button switch, which can be used as a key switch in electronic keyboards. Electronic in many applications Keyboards it is advantageous to have a key in response to the depression of a keyboard push button Brief switching signal is generated in contrast to a continuously present switching signal, as this is the Key operation facilitated.

According to the invention is an electric push button switch for achieving a momentary switching effect thereby characterized in that a spring-loaded push button is provided which, when depressed, causes a cam surface to move against a resiliently moving contact member of the switch, thus initially bending the contact member is triggered to establish electrical contact or to release from a fixed contact member and then during the depression of the push button the sudden release of the pressure forces in the contact member by a Snap deflection is enabled when it is over the curve

309830/0529 originally inspected

surface slides so that electrical contact with the stationary Contact member is interrupted or restored by stretching the movable contact member.

The fixed contact member is preferably a helical spring, which also serves as a biasing spring for the push button, with the "resilient" moving contact member at least partially may be mounted inside the coil spring so that the moving contact member when it is bent under the . Action of the cam surface touches the inside of the coil spring.

An embodiment is shown in the single figure of the drawing, which is a schematic section through the invent proper key switch shows,

The switch shown in the drawing includes an insulating body 1, which has a push button 3 in the representation upwardly biasing coil spring 2 accommodates. This helical spring 2 also forms the stationary one Contact member of the switch. The movable contact member consists of a spring metal strip 4, the serpentine is pre-bent. The fixed and the movable contact element are equipped with connections 5 and 6, respectively, which extend through the base of the body 1.

To operate the switch, push button 3 is pressed against the action of helical spring 2 The underside of the pushbutton is designed as a kmkave curved surface that faces down onto the bent head of the Presses spring metal strip 4 and during this process bends the middle part of spring metal strip 4 outwards,

309830/0529

-, 3 -

until it touches the inner surface of the coil spring 2. In this way, the switch contacts are closed. After contact with the helical spring is made, the continued downward effect caused by the Movement of the push button 3 force exerted on the spring metal strip causes a sudden movement of the head of the Spring metal strip 4 along the curved surface 7 upwards into the recess 8, so that the spring metal strip 4 again essentially assumes its pre-bent shape shown and is released from the coil spring 2 with interruption of the electrical contact. It can thus be seen that the switch executes a momentary closing process.

After the pushbutton 3 has been released, it again assumes the position shown, and so does the head of the spring metal strip 4 consequently moves out of the recess 8, & o that it moves to the right in the view of the illustration moves and assumes the position shown.

From the above description it can be seen that the switch according to the invention is extremely simple. While a switch has been described which performs a momentary closing action, a Switching or interruption process can be brought about.

Claims

309830/0529

Claims (4)

23Ü / 699 claims 1. Electric push-button switch for executing a . momentary switching process during switch actuation, characterized in that a spring-loaded push button is provided, which when pressed down causes a cam surface against a resilient -moving contact member of the switch to move, thus initially bending the contact member to make electrical contact or is triggered to release by a fixed contact member and then while depressing the push button the sudden release of the pressure forces .im is made possible in the contact member by a snap deflection when it slides over the curved surface, .- so that the electrical contact with the fixed contact member by stretching the movable contact member is interrupted or restored. 2. Switch according to claim 1, characterized in that the fixed contact member consists of a helical spring, which also serves as a preload spring for the push button. 3. Switch according to claim 2, characterized in that the resiliently moving contact member is at least partially is mounted inside the coil spring, so that it is bent under the action of the cam surface moved to make electrical contact with the inside of the coil spring. 4. switch xiacn claim 1, characterized in that the resilient: the moving contact member is a serpentine-shaped spring strip. 309830 / OB29