Polycast level instruments with means for retaining level vials

Details Polycast level instruments with means for retaining level vials Polycast level instruments with means for retaining level vials

1984-01-30

1986-02-25

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33384, G01C 928

Patent

active

045718458

ABSTRACT:
A specially contoured cavity or recess for the precise alignment and retention of a uniform cylindrical level vial in Polycast plastic level instruments or other hand tools. The recess is accurately oriented with respect to tool measuring surfaces during the Polycast molding process. The contoured cavity or recess is dimensioned to tightly receive the level vials thereby accurately indexing the vial in relation to the measuring surfaces. The retention recess has a semi-cylindrical contour and a vial receiving opening defined between a pair of opposed ridges. The ridges include a sloped vial receiving forward surface and extend inwardly into the receiving opening a selected dimension to permit entry and retention of the level vial.

REFERENCES:
patent: 2993281 (1961-07-01), Dock
patent: 3225451 (1965-12-01), Olexson et al.
patent: 3368287 (1968-02-01), Ault
patent: 3824700 (1974-07-01), Rutty

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