Locks – Parts – attachments – accessories and adjuncts – Condition indicators
Patent
1988-12-19
1990-06-26
Smith, Gary L.
Locks
Parts, attachments, accessories and adjuncts
Condition indicators
70408, 70276, 70413, E05B 4100
Patent
active
049368966
ABSTRACT:
A device for confirming whether a lock is locked or unlocked in which a display magnet consisting of a sheet- or plate-like permanent magnet is rotatably disposed within a key head. Two magnet pairs, each consisting of a first drive magnet, and a second drive magnet are located at angular positions, respectively, on the front end face of a cylinder lock at opposite sides, respectively, of an intermediate angular position within a range of rotation of a key for locking and unlocking the cylinder lock. The direction of magnetization of one magnet pair is opposite to that of the other magnet pair. In response to the rotation of the key for locking or unlocking the cylinder lock, one, and the other, magnet pair imparts magnetic forces through a pair of magnetic induction plates disposed within the key head to the display magnet from different directions so that when the cylinder lock is locked or unlocked, the display magnet is forced to rotate in one or other direction to a predetermined angular position and is securely maintained at this position by the attraction between the display magnet and the magnetic induction plates.
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Dino Suzanne L.
Hasegawa Hiroshi
Smith Gary L.
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