Spirit level

Details Spirit level Spirit level

1980-11-28

1982-06-22

Phillips, Charles E.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33379, G01C 928

Patent

active

043355242

ABSTRACT:
A level formed by a frame having opposing longitudinal working surfaces and a transverse opening in the frame supporting a ring assembly for angular rotation in a longitudinal plane of the frame. A spheroid vial containing a bubble indicator is supported by the ring assembly with its major axis extending diametrically across the inner periphery of the ring assembly to register a level position when the major axis of the vial is disposed in a horizontal plane. Angle indicating indicia is scored on the surface of plates abutting opposing sides of the frame and maintaining the ring assembly within the frame opening for indicating selective angular alignment of the major axis of the vial with respect to the plane of the working surface whereby preselected orientation of the vial with the angle indicia indicates a preselected angular relationship of the vial major axis and a working surface when the working surface is in contact with the surface being measured. A permanent magnet, slidably supported by the frame, releasably holds the ring assembly in selected positions of the vial relative to the plane of the working surface.

REFERENCES:
patent: 1300818 (1919-04-01), Collins
patent: 1794254 (1931-02-01), Sherwood
patent: 2993281 (1961-07-01), Dock
patent: 3871109 (1975-03-01), Vaida

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