Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1981-07-28
1984-03-27
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361171, 292144, H01H 4700
Patent
active
044398085
ABSTRACT:
An electromagnetic lock for, for example, a door comprising an electromagnet attached to the frame and a magnetizable member attached to the door the magnetizable member being attracted to the electromagnet when the door is in its closed or otherwise locked position, shoulders being provided on or adjacent the electromagnet and magnetizable member whereby if the door is forced to overcome the electromagnetic attraction the shoulders engage to prevent unauthorized unlocking of the door.
REFERENCES:
patent: 1958940 (1934-05-01), Cavanaugh et al.
patent: 2673108 (1954-03-01), Roller
patent: 2727772 (1955-12-01), Hamilton
patent: 3751088 (1973-08-01), Schlage et al.
patent: 3851314 (1974-11-01), Hedin
patent: 3859571 (1975-01-01), Strobl
patent: 4100810 (1978-07-01), Sima, Jr. et al.
patent: 4148092 (1979-04-01), Martin
BSG (Security) Limited
Eisenzopf Reinhard J.
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