Spirit level

Details Spirit level Spirit level

1983-04-15

1985-08-13

Stearns, Richard R.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33381, 52208, 277 50, G01C 928, E06B 300

Patent

active

045341176

ABSTRACT:
A spirit level which includes a frame having a hole therein. At least one liquid-containing leveling vial is located in the hole and is preferably mounted in a vial holder having a central opening therethrough. The vial and, where used, the vial holder are fixed to the frame. Extending substantially across the hole is a transparent sight plate held in place by a resilient annular gasket. The gasket includes an angular, annular lip which is sealingly deflected against the sight plate, and a similar lip is sealingly deflected against the portion of the frame forming the hole. The gasket preferably includes a radially outward flange which maintains the gasket in contact with the transparent plate, and which extends into a radial groove around the frame opening.

REFERENCES:
patent: 1166045 (1915-12-01), Gethmann
patent: 1426454 (1922-08-01), Bredeson
patent: 2175909 (1939-10-01), Nelson
patent: 2280389 (1942-04-01), Edwards
patent: 2536788 (1951-01-01), Vaida
patent: 2669029 (1954-02-01), Ries
patent: 2948066 (1960-08-01), Rosenholm
patent: 3004305 (1961-10-01), Goodemote et al.
patent: 3029524 (1962-04-01), Vaida et al.
patent: 4259135 (1981-03-01), Kulla
patent: 4283885 (1981-08-01), Remick et al.

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