Tilt sensor and top cover plate thereof

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive

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Details

33379, G01C 936

Patent

active

059269650

ABSTRACT:
A tilt sensor includes a sealed container formed of a container body, a top cover plate adapted to close the container body and provided on one end surface thereof with a recess having a concave surface whose depth gradually increases from a peripheral edge toward a center thereof. The tilt sensor further includes a liquid enclosure containing an air bubble, that is enclosed in the container body. To coincide the center of the configuration of the top cover plate with a line normal at a deepest portion of the concave surface at a grinding operation after molding the top cover plate, an indicia is provided on the line normal to the concave surface at the deepest point of the concave surface.

REFERENCES:
patent: 666843 (1901-01-01), Brownell
patent: 988637 (1911-04-01), Graul
patent: 1898367 (1933-02-01), Heinze
patent: 2806296 (1957-09-01), Weichert
patent: 3061920 (1962-11-01), Johnson
patent: 3164023 (1965-01-01), Holderer
patent: 3487303 (1969-12-01), Remington
patent: 3871109 (1975-03-01), Vaida
patent: 4583296 (1986-04-01), Dell'Acqua
patent: 5774996 (1998-07-01), Ogawa et al.

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