Secured locking device

Details Secured locking device Secured locking device

1990-07-16

1991-11-05

Smith, Gary L.

Closure fasteners

Bolts

Sliding and rotary

292 62, 292 11, 292DIG25, 292DIG32, E05C 502

Patent

active

050626698

ABSTRACT:
A lock mechanism for safely locking doors, such as trailer-tractor vehicle doors and for controllably releasing same including a reciprocal or rotatable locking member such as a sliding bolt movable up through the floor of a trailer to a first locking position wherein a door is positively locked and a release position wherein the vehicle door is released with the locking member housed in a tamper-proof box with a pivotal panel that is held shut by a latch released by a latch operator means which is activated by an air drive that can be primarily operated only when connected to the air pressure system of a vehicle.

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patent: 1356774 (1920-10-01), Lanchester
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patent: 3601453 (1971-08-01), Silverman
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patent: 3813119 (1974-05-01), Panici
patent: 4021066 (1977-05-01), McShane
patent: 4111472 (1978-09-01), Smith et al.
patent: 4249345 (1981-02-01), Littleton
patent: 4501378 (1985-02-01), Berfield

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