Switch arrangement
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United States of America Patent
Stats
-
Feb 16, 1988
Grant Date -
N/A
app pub date -
Mar 27, 1986
filing date -
Apr 1, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In connection with a switch arrangement for circuit-making and circuit-breaking, as well as for controlling the speed of, electric machines it is proposed to provide a double-pole circuit-maker and circuit-breaker safety switch and to connect it in series with the motor connections in such a manner that in a first switching position of the double-pole safety switch the connection to mains is established while in the other switching position at least one motor field winding is short-circuited with the armature winding by an actuating element provided in common for the two partial change-over switches, by changing the polarity for instantaneous braking, there being provided a separate speed-setting selector switch which can be operated independently of the saftey switch and which is designed to permit presetting of a motor cut-out position which enables the motor to run out freely when the safety switch does not respond separately or when the device is not opened to cause the safety switch to respond.
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