Door unlocking device and method

Details Door unlocking device and method Door unlocking device and method

1990-10-23

1993-03-23

Nelson, Peter A.

Ammunition and explosives

Blasting

Mat or deflector

102302, 89 114, 70262, F12D 300

Patent

active

051966476

ABSTRACT:
The invention comprises a device and method for forcibly opening a locked door. A sealed chamber is adapted to sealably receive the barrel of conventional firearm. A piston in the sealed chamber is connected to a ramming plate. A blank cartridge is placed in the firearm and detonated, pressurizing the chamber and forcing the ramming plate against the exterior of the door with great force and speed. After the piston moves a predetermined distance, the chamber is vented and a spring returns the piston and ramming plate to their original position. The procedure may be rapidly repeated as many times as may be necessary to force the door open.

REFERENCES:
patent: 3218927 (1965-11-01), Stott
patent: 3885761 (1975-05-01), Pendergast et al.
patent: 3983892 (1976-10-01), Hardesty
patent: 4187759 (1980-02-01), Toy et al.
patent: 4282714 (1981-08-01), Fiocchi
patent: 4848209 (1989-07-01), Almeras
patent: 4856430 (1989-08-01), Gibb et al.
patent: 4978089 (1990-12-01), Alquier et al.

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