Title:
SAFETY SWITCH
Document Type and Number:
Japanese Patent JPH1125810
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent dangerous operation by enabling a safety door to be unlocked by a manual operation when the safety door is closed, and a key member is set at a predetermined position of a switch body and by keeping a lock member in an unlocked state by means of a spring action when the safety door is not closed or a control signal is turned off by a power failure or the like. SOLUTION: While a safety door 6 is opened, a lock solenoid 22 and a lock- release solenoid 33 are not energized, a lock block 20 is lowered through the action of a lock spring 23, and a lock-release block 30 is pressed against the side surface of the lock block 20 through a lock-release spring 32. A forced release key 4 is inserted and turned into a normal condition other than a power cut-off condition such as power failure or the like, the lock-release block 30 is moved leftwards but the lock solenoid 22 maintains a current-carrying state, so that the lock block 20 continues to lock a key 2 without being lowered. In normal condition, a forced release of the lock cannot be performed.
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Inventors:
SUGIO NAOKI
NISHIYAMA KAZUO
NISHIYAMA KAZUO
Application Number:
JP18230797A
Publication Date:
January 29, 1999
Filing Date:
July 08, 1997
Export Citation:
Assignee:
HITACHI METALS LTD
International Classes:
B23Q11/00; F16P3/10; H01H27/06; (IPC1-7): H01H27/06; B23Q11/00; F16P3/10
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