Safety circuit

Details Safety circuit Safety circuit

1996-10-04

1998-06-23

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361190, 307326, H01H 4732

Patent

active

057711461

ABSTRACT:
Safety circuits with an actuating device for electrical appliances, where the actuating device is capable of being operated by means of two key buttons or switch stacks are of use in many different areas of application. In order to create a generally suitable safety circuit, which is very simple and clear and which therefore brings with it low costs, which however stands up to all safety criteria, including the avoidance of any manipulation it is proposed that the two key buttons (S1, S2) each have a break contact (s1o, s2o) and a make contact (s1s, s2s) and act in combination with an associated driver stage (2), preferably a transistor driver stage with transistors (Q1, Q2, Q3, Q4), that the driver stage has two relays (K1, K2), that an astable circuit or multivibrator (1) with an elementary frequency of about 1000 Hz for the generation of two complementary square wave signals is connected to the relays (K1, K2) via contacts (k1, k2) so that the relays (K1, K2) are dynamically switchable.

REFERENCES:
patent: 3315243 (1967-04-01), Weiberg
patent: 3371254 (1968-02-01), Hagfors
patent: 3793533 (1974-02-01), Ginsberg
patent: 3914621 (1975-10-01), Passarelli, Jr. et al.
patent: 4412268 (1983-10-01), Dassow
patent: 5235217 (1993-08-01), Kirton

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