Tool for setting and determining angles

Details Tool for setting and determining angles Tool for setting and determining angles

1998-02-26

2000-11-21

Hirshfeld, Andrew H.

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33500, B43L 710

Patent

active

061485314

ABSTRACT:
A tool for accurately determining and setting angles using an x beam and a y beam that pivot about a common axis and may be locked in position relative to each other with an axle lock and by locking one leg of each beam to a slotted stabilizer bar. Index holes on the x beam and the y beam receive movable index pins between which measurements are taken. Trigonometric calculation may be used, or a precalculated reference book or data table may be consulted, to determine or set the angle between the x and y beams for various index pins separations, when the pins are located in the various combinations of x and y beam holes. Relatively course linear measurements permit very fine angular measurements and settings.

REFERENCES:
patent: 404451 (1889-06-01), Waggoner
patent: 655005 (1900-07-01), Penfield
patent: 732827 (1903-07-01), Chambers
patent: 883908 (1908-04-01), Petterson
patent: 1006948 (1911-10-01), Johnson
patent: 1534865 (1925-04-01), Owens
patent: 1590031 (1926-06-01), Imhof
patent: 1593068 (1926-07-01), Gray
patent: 3635942 (1972-01-01), Nicyper
patent: 3868777 (1975-03-01), Bell
patent: 4394801 (1983-07-01), Thibodeaux

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