Level with two guide frames and ball in each

Details Level with two guide frames and ball in each Level with two guide frames and ball in each

1984-08-06

1985-05-07

Ward, Robert S.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33 1H, 33395, 116215, G01C 910

Patent

active

045149089

ABSTRACT:
A level characterized wherein two guide frames are arranged within a base member one above the other so that they cross each other at right angles. The guide frames are provided with internal rolling-contact surfaces each shaped as an upward-curving circular arc, respectively, the lowest parts of the rolling-contact surfaces being positioned at the point at which the guide frames cross, and the interiors thereof being visible through top surfaces thereof. Balls are contained rotatably in the two guide frames, respectively. The ball in the upper guide frame is formed so as to have a diameter slightly smaller than that of the ball in the lower guide frame.

REFERENCES:
patent: 2067474 (1937-01-01), Carbonara
patent: 2068017 (1937-01-01), Given
patent: 2411165 (1946-11-01), McBride
patent: 2859725 (1958-11-01), Genasci
patent: 3548508 (1970-12-01), Jacobsen

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