Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1977-12-27
1979-05-15
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 928, G01C 936
Patent
active
041540018
ABSTRACT:
The combination with an electric drill of a spirit level, a foot provided with a spindle, the axis of which is at right angles to the surface of the foot by means of which the foot may be mounted in the drill chuck with its surface at right angles to the axis of the drill and a band encircling the electric drill, said band mounting the spirit level thereon such as to enable positioning the bubble in the level at a predetermined position for the angle of the shaft relative to the plane surface to be drilled such that when the foot is replaced by a drill, the drill may be positioned at said angle to said surface by positioning the bubble at said predetermined position.
REFERENCES:
patent: 2756512 (1956-07-01), Pettit
patent: 2757458 (1956-08-01), Zipser
patent: 2806296 (1957-09-01), Weichert
patent: 3030710 (1962-04-01), Fell
patent: 3807051 (1974-04-01), Funakubo
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