Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1989-01-02
1990-03-20
Jennings, Derek S.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361160, 335179, 335205, 307112, 340547, 200 50A, 200 6162, H01H 316
Patent
active
049106341
ABSTRACT:
An interlock switch for the service door of a computer. The switch prevents power from being automatically resupplied to the computer if the door is opened while power has been interrupted, even if the door is subsequently closed. The interlock switch includes a magnetic reed switch, an electromagnet for closing the reed switch contacts when the power-on switch of the computer is actuated, and a permanent magnet which holds the reed switch contacts closed as long as the service door has not been opened. The reed switch and electromagnet are mounted on the frame of the cabinet of the computer. The permanent magnet is mounted on the edge of the service door adjacent the reed switch. The use of the switch in a security system is also disclosed.
REFERENCES:
patent: 3742162 (1973-06-01), Wasemann
patent: 3771154 (1973-11-01), Takei
patent: 3967164 (1976-06-01), Valle
patent: 4214220 (1980-07-01), Queen
patent: 4284864 (1981-08-01), Crow et al.
patent: 4438430 (1984-03-01), Young et al.
patent: 4581597 (1986-04-01), Walley
patent: 4716495 (1987-12-01), Craker
Hawk Jr. Wilbert
Jennings Derek S.
Jewett Stephen F.
NCR Corporation
Osborn David
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