Vehicular road block

Details Vehicular road block Vehicular road block

1984-02-03

1985-11-26

Novosad, Stephen J.

Bridges

Gangway, ramp, or dock leveler

404 6, 404 11, 52232, 49 33, E01D 100, E01F 1300

Patent

active

045546959

ABSTRACT:
A road block for preventing unauthorized vehicles from entering a secured area comprises a pit, a span covering the pit, collapsible support members supporting the span at the trailing end of the plate with respect to the direction of vehicle access, devices for collapsing the support members, and a triggering mechanism for actuating the collapsing devices in response to the approach of an unauthorized vehicle.

REFERENCES:
patent: 815663 (1906-03-01), Walker et al.
patent: 1217381 (1917-02-01), Zubryd
patent: 2107080 (1938-02-01), Mitchell
patent: 2643010 (1953-06-01), Hott et al.
patent: 2917283 (1959-12-01), Sumners
patent: 3530488 (1970-09-01), Beckwith
patent: 4332503 (1982-06-01), Hurst Jr.
patent: 4367975 (1983-01-01), Tyers
patent: 4429483 (1984-02-01), Murakami
patent: 4472908 (1984-09-01), Wanzl et al.

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