Geometrical instruments – Indicator of direction of force traversing natural media – Structurally installed including relation to feature thereof
Patent
1983-05-26
1984-02-21
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Structurally installed including relation to feature thereof
33382, 33390, G01C 928
Patent
active
044321465
ABSTRACT:
A drill includes an integrated bi-directional orienting means for leveling the device when in use. The bi-directional orienting means preferably comprises a circular bubble level attached to the butt of the drill. It is relatively easy for the drill operator to level the drill by keeping the bubble in the center of the circular level. A tubular level is separately attached to the top of the drill for guidance in the direction perpendicular to the plane of the circular level. In an alternative embodiment, a tubular level is integrally attached at right angles to the circular level. The liquid filled cavity inside the circular level and tubular level is continuous so that the indicator bubble can travel from the tubular level to the circular level and back again. The apparatus may be adhesively attached to the drill or, the drill may include a cavity for receiving and holding the apparatus.
REFERENCES:
patent: 960718 (1910-06-01), Schtabe
patent: 1204768 (1916-11-01), Hommel
patent: 1234594 (1917-07-01), Wilner
patent: 1333559 (1920-03-01), Moulton
patent: 2541366 (1951-02-01), Kennedy
patent: 3540122 (1970-11-01), Bogdan
patent: 3864839 (1975-02-01), Wolf
patent: 4125944 (1978-11-01), Esposito et al.
patent: 4295279 (1981-10-01), Sienknecht
"Drill Guide" Sears Catalog No. 9 GT 51726; p. 138.
Little Willis
Woodbridge Richard C.
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