Hydraulic spring vehicle barricade and hydraulic circuit therefo

Details Hydraulic spring vehicle barricade and hydraulic circuit therefo Hydraulic spring vehicle barricade and hydraulic circuit therefo

1988-05-04

1989-07-25

Massie, IV, Jerome W.

Road structure, process, or apparatus

Traffic steering device or barrier

49 33, 49 49, 49131, 91508, 60477, E01F 1300

Patent

active

048507377

ABSTRACT:
A vehicle barricade comprises a frame to which a barrier plate is pivotally mounted for being moved between a passage and a blocking position. First and second hydraulic motors operably interconnect the plate and the frame. An hydraulic power supply is operably connected with the hydraulic motors and includes an uninterrupted line for assuring constant power supply to the first hydraulic motor for thereby biasing the first hydraulic motor into extension and control valve means for selectively supplying power to the second motor for thereby causing selective pivoting of the plate.

REFERENCES:
patent: 2187513 (1940-01-01), Evans
patent: 3626637 (1971-12-01), Rudicel
patent: 3748782 (1973-07-01), Reynolds
patent: 3984889 (1976-10-01), Blomgren
patent: 4091488 (1978-05-01), Artzberger
patent: 4332503 (1982-06-01), Hurst, Jr.
patent: 4354771 (1982-10-01), Dickinson
patent: 4490068 (1984-12-01), Dickinson
patent: 4627763 (1986-12-01), Roemer et al.
patent: 4630395 (1986-12-01), Nasatka

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