Cutting by use of rotating axially moving tool – With signal – indicator – illuminator or optical means
Patent
1983-09-06
1986-01-14
Briggs, William R.
Cutting by use of rotating axially moving tool
With signal, indicator, illuminator or optical means
33334, 33384, 408241R, B23B 4900, G01C 928
Patent
active
045643229
ABSTRACT:
A drill scope comprising a calibrated protractor that can be read directly in terms of angle of tilt of the drill bit and a pivoting spirit level support means with tilt angle marker and bull's-eye bubble level that can be pivoted to a selected angle of tilt and then held in that position during use of the drill. In this manner, when the hand held drill is held such that the bubble reads level, the angle of tilt or inclination of the resulting hole can be readily maintained within one degree. The drill scope can be a U-shaped arm with level that swings over the entire drill housing, a circularly curved surface integrally mounted in the drill housing with a sliding element that holds the level or a calibrated protractor disc with radial support arm and level that attaches to the conventional side handle hole of the drill.
REFERENCES:
patent: 953863 (1910-04-01), Shaw
patent: 1333559 (1920-03-01), Moulton
patent: 2525387 (1946-05-01), Volk
patent: 2806296 (1957-09-01), Weichert
patent: 4141151 (1979-02-01), Jansky
patent: 4227839 (1980-10-01), Conway
patent: 4295279 (1981-10-01), Sienknecht
patent: 4329095 (1982-05-01), Schmuck
patent: 4402141 (1983-09-01), Sterrenberg
patent: 4457078 (1984-07-01), Suchy
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