Devices for applying pressure to a closed door

Details Devices for applying pressure to a closed door Devices for applying pressure to a closed door

1988-05-11

1990-10-02

Hartman, J. J.

Implements or apparatus for applying pushing or pulling force

Fluid pressure

Vehicle attached

254133R, 72705, 29239, B66F 324

Patent

active

049602659

ABSTRACT:
A jack for opening locked or barricaded doors has a first hydraulic single acting piston and cylinder actuator mounted on a casing by which holding claws are forces into engagement with a door frame to hold the jack in place. An arm is pivotted on the casing and an end opposite the pivot forced against the door by a second hydraulic single acting piston and cylinder actuator to open the door, reaction to the opening force being transmitted to the door frame through the casing and claws. The reservoir for the hydraulic fluid is provided to the rear of the piston of the actuator. The jack is readily portable and self-contained, and does not present a significant obstacle to entry through a door which has been forced using the jack.

REFERENCES:
patent: 3295330 (1967-01-01), Meshorer
patent: 4664364 (1987-05-01), Lymburner
patent: 4762304 (1988-09-01), Hill

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