Geometrical instruments – Area integrators – Electrical
Patent
1976-07-13
1977-07-05
Phillips, Charles E.
Geometrical instruments
Area integrators
Electrical
33180R, G01B 500
Patent
active
040330443
ABSTRACT:
An alignment tool for establishing the proper location for boring a hole in a door to receive the cylinder of a lock so that the lock will be properly aligned with the strike in a lock of the type colloquially referred to as a "jimmy-proof" lock. The strike, which has two bolt-receiving protruding flanges, is installed in the proper place on the door jamb. The alignment tool is then mounted on the strike, the tool including an elongated bar dimensioned to fit between the strike flanges and having an opening which is to be aligned with the flange openings. A peg is inserted through the flange openings and the opening in the end of the bar so that the bar is pivotable about the central axis of the flange openings. A threaded bolt penetrates the other end of the bar and the bar is moved so that the end of the bolt contacts the door surface. The bolt is then rotated until the bar is parallel with the door surface. A marking punch slidably passes through an additional opening in the bar, this opening being positioned so that its central axis lies in the precise location for the center of the lock cylinder relative to the strike. With the bar thus positioned, the punch is struck, making a mark on the door where the lock cylinder hole can be bored. The alignment tool is then removed and the lock is installed. Pegs are provided for strikes made by different manufacturers to accommodate different size openings in the strike flanges.
REFERENCES:
patent: 837195 (1906-11-01), Chase
patent: 2384071 (1945-09-01), Boyer
New York School of Locksmithing, Inc.
Phillips Charles E.
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