Scriber-compass with spring-loaded center punch

Details Scriber-compass with spring-loaded center punch Scriber-compass with spring-loaded center punch

1977-04-27

1979-11-06

Haroian, Harry N.

Geometrical instruments

Scriber

Curved line

33191, B43L 922, B25D 502

Patent

active

041730763

ABSTRACT:
A scriber-compass comprises a pair of first and second arms pivotally connected together at first ends thereof and a threaded rod, having a thumb nut threadably mounted thereon, adapted to selectively pivot the arms relative to each other to set the linear distance between second ends of the arms. A calibrated scale is formed on the rod to visually indicate such linear distance which coincides with the radius of a circle to be scribed on a work piece. A scibing point is formed on the second end of the first arm whereas an automatic punch is mounted on the second end of the second arm for automatically punching a centering hole upon depression of the punch against the workpiece and release of a spring-loaded impact member.

REFERENCES:
patent: 772334 (1904-10-01), Bornheimer
patent: 921407 (1909-05-01), Irish
patent: 1009256 (1911-11-01), O'Leary
patent: 1226337 (1917-05-01), Lackner
patent: 1303747 (1919-05-01), Walton
patent: 1572046 (1926-02-01), Seiler
patent: 1766546 (1930-06-01), Roos
patent: 1777653 (1930-10-01), Rehm
patent: 2384707 (1945-09-01), Sweet
patent: 2758381 (1956-08-01), Benkoe

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