Locks – Operating mechanism – Key
Patent
1987-07-07
1989-06-13
Wolfe, Robert L.
Locks
Operating mechanism
Key
70384, 70387, E05B 2500
Patent
active
048380580
ABSTRACT:
Engaging pieces of plates pivotally mounted in a lock box are adapted to engage holes or cutouts formed in a slide member slidable between its locked and unlocked positions. When a right card formed with holes and cutouts in right positions is inserted into a card slot, the engaging pieces in engagement with the holes or cutouts are all pushed down by the card, pivot or pins and are disengaged out of the holes, while the engaging pieces out of engagement are not pushed by the card owing to the cutouts or holes in the card. Thus the slide member freed from the restraint by the engaging pieces can be slid to its unlocked position to open the lock. When a wrong card is inserted, the engaging pieces out of engagement with the slide member will be pushed by the card and engage the slide member, restraining it from moving. Thus the lock cannot be opened.
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patent: 4777815 (1988-10-01), Lovell et al.
Dino Suzanne L.
Matsumoto Metal Mfg. Co., Ltd.
Wolfe Robert L.
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