Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support
Patent
1978-07-05
1983-03-01
Briggs, William R.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
408 97, 408111, B23B 4000
Patent
active
043753418
ABSTRACT:
This is an attachment for electric drills by which accurate alignment for drilling may be achieved without the necessity of complicated preliminary steps. The invention comprises an elongated extension rod mounted in a particularly constructed handle which is slideable with relation to the rod and which handle has an extension through which the drill can be observed, which extension has a particular end configuration making it suitable to drill straight and accurate holes into virtually any configuration of surface and at a distance from the drill without the necessity of complicated measuring, marking and preliminary steps.
REFERENCES:
patent: 100772 (1870-03-01), Kelly
patent: 757950 (1904-04-01), McElwain et al.
patent: 1212634 (1917-01-01), Hathaway
patent: 2671667 (1954-03-01), Flory
patent: 2784616 (1957-03-01), Quackenbush
patent: 3060772 (1962-10-01), Crump
patent: 3083593 (1963-04-01), Cotter
patent: 3146675 (1964-09-01), Anderson
patent: 3320832 (1967-05-01), Jensen
patent: 3620636 (1971-11-01), Godard
patent: 3907452 (1975-09-01), Tripp
"Safety Devices", p. 134, American Machinist, May 10, 1945.
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