Geometrical instruments – Indicator of direction of force traversing natural media – Structurally installed including relation to feature thereof
Patent
1980-03-10
1981-10-20
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Structurally installed including relation to feature thereof
33373, 33381, 33390, G01C 928
Patent
active
042952794
ABSTRACT:
Leveling apparatus for a hand tool such as an electric drill or reciprocating saw is comprised of both a cylindrical bubble level and circular bubble level. The cylindrical bubble level has a longitudinal axis parallel to the working axis of the tool, and thus is utilized for leveling the tool in a horizontal plane. The circular bubble level has an axis passing perpendicularly through its center which is parallel to the working axis of the tool. The circular bubble is utilized for vertically aligning the tool normal to a horizontal datum plane. The bubble of the cylindrical bubble level is viewable from a multiplicity of perspectives. The apparatus may be selectively attached to the drill of different positions on the tool to further improve visibility of the bubble levels. Alternatively, the apparatus is integrated into the housing of the drill.
REFERENCES:
patent: D220124 (1971-03-01), Powell
patent: 1234594 (1917-07-01), Wilner
patent: 2406211 (1946-08-01), Flint
patent: 4154001 (1979-05-01), Serafin
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