Metal working – Method of mechanical manufacture – Disassembling
Patent
1980-10-08
1982-07-20
Parker, Roscoe V.
Metal working
Method of mechanical manufacture
Disassembling
81 3R, B23B 3500, B23P 1904
Patent
active
043398634
ABSTRACT:
A tool is provided for opening a lock, particularly a mortise cylinder type lock, the plug of which has been drilled out with drill bits available in the art. The lock opening tool, which is inserted into this prepared opening includes a hollow member, preferably a cylindrical tube having an opening along one diameter into which a strip of spring steel is inserted, and an opening along the circumference, at the opposite end of the cylindrical tube, through which the end of the strip of spring steel can be extended, essentially at a 90.degree. angle. In use, the cylinder lock which must be opened without the benefit of a key, for example because of a lost key, is drilled out by using essentially standard means through the cylinder plug, which is a continuation of the hole already started. The lock opening device of the present invention is inserted through the opening, the spring steel inserted, and the extending portion, from the circumference, employed to engage and move the tongue inside the mortise cylinder counterpart lock at the rear of the lock to remove the bolt from the strike plate.
REFERENCES:
patent: 2344696 (1944-03-01), Graham
patent: 3990301 (1976-11-01), Smith
patent: 4094176 (1978-06-01), Hughes
patent: 4261093 (1981-04-01), Steffen et al.
patent: 4307983 (1981-12-01), Blough
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