Lock, key and combination of lock and key

Details Lock, key and combination of lock and key Lock, key and combination of lock and key

1992-03-16

1994-09-27

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

70278, 70283, 361172, H04Q 100, G06K 1906, E05B 4706

Patent

active

053510429

ABSTRACT:
A battery-less electronic cylinder lock comprises an electromagnet or other electrical release mechanism controlled by an electronic circuit. A cooperating key comprises a battery and a code producing circuit. When the key is inserted in the lock, power for the lock is supplied from the battery to the electronic circuit and the electromagnet by means of a transformer coupling arrangement with a primary portion in the key and a secondary portion in the lock. Alternatively, power may be supplied via electrical contacts on the key and on the lock.

REFERENCES:
patent: 3846679 (1974-11-01), Jost et al.
patent: 3872415 (1975-03-01), Clarke
patent: 3953769 (1976-04-01), Sopko
patent: 3979647 (1976-09-01), Perron et al.
patent: 4031434 (1977-06-01), Perron et al.
patent: 4379966 (1983-04-01), Flies
patent: 4594637 (1986-06-01), Falk
patent: 4638882 (1987-01-01), Sato
patent: 4753465 (1988-06-01), Dalby
patent: 4848115 (1989-07-01), Clarkson et al.
patent: 4866962 (1989-09-01), Aston et al.
patent: 5140317 (1992-08-01), Hyatt, Jr. et al.

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