Electric safety locking device
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Jun 6, 1996
filing date -
Jun 6, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric locking device includes at least one main switch with a make contact, one secondary magnetic flexible leaf switch with a break contact, at least one auxiliary relay including at least one make contact, and an external control member comprising at least one permanent magnet. The main switch directly controls the relay coil after the secondary switch has been opened by the presence of a magnet in the control member, and the secondary switch, when it closes again, shorts the relay coil. This occurs when the control member and the magnet moves away. The assembly may be constructed such that the approach of the control member, by the presence of the magnet, first causes the opening of the secondary switch, then the closing of the main switch. The control member, during its retraction, releases the main switch that opens before the secondary switch closes. The secondary switch is never crossed by a current except in the case of a failure of the main switch, or during an attempt to tamper the locking device, causing the closure of the main switch without opening the secondary switch.
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