Security system for loading doors

Details Security system for loading doors Security system for loading doors

1988-02-22

1989-09-19

Wolfe, Robert L.

Locks

Operating mechanism

Using a powered device

292144, 292334, 292DIG32, 70282, 70256, E05B 4900

Patent

active

048669636

ABSTRACT:
A system for securing the loading doors of trucks, semi-trailers, and other like enclosures against forced or unauthorized entry should the usual manually operable closure device on such doors be breached. The system comprises a locking arrangement which is disposed entirely within but which is selectively operable from the exterior of the enclosure as by a special key or by activation of an electronic or electric circuit through entry of a predetermined code or signal. The locking arrangement includes a plunger which is automatically engageable with a strike member to secure a door upon its closure and which is moveable to an inoperative position by the action of a pneumatic or hydraulic cylinder or electric solenoid or other like activator.

REFERENCES:
patent: 1654207 (1927-12-01), Bergonzoni
patent: 2466855 (1949-04-01), Lauver
patent: 2650388 (1953-09-01), White
patent: 2709610 (1955-05-01), Chandler
patent: 3601453 (1971-08-01), Silverman
patent: 3614147 (1971-10-01), Spector
patent: 3830332 (1974-08-01), Fontaine
patent: 3933382 (1976-01-01), Counts
patent: 3950018 (1976-04-01), Pickering
patent: 4021066 (1977-05-01), McShane
patent: 4207555 (1980-06-01), Trombly

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