Cutting by use of rotating axially moving tool – Tool or tool with support – Having axial – core-receiving central portion
Patent
1984-09-05
1986-04-01
Schran, Donald R.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having axial, core-receiving central portion
408 75, 408 79, 408 82, 408115R, B23B 4900
Patent
active
045794863
ABSTRACT:
A hole saw guide positions a hole saw while forming a new hole either partially overlapping or surrounding an existing hole in a work piece. The hole saw guide includes a disc-shaped body having a pilot drill guide hole through the center sized to guide the pilot drill of a conventional hole saw. Two or more guide arms extend radially outwardly from the body and have outer ends which engage the inner circumference of an existing hole in the work piece to secure the guide at a desired position. The guide arms are adjustable in length radially so the pilot drill guide hole in the body can be positioned where desired. The pilot drill of a conventional hole saw is then inserted into the pilot drill guide hole which properly centers the hole saw so that the new hole formed in the work piece is properly located.
REFERENCES:
patent: 2435256 (1948-02-01), Whitmore
patent: 2633040 (1953-03-01), Schlage
patent: 3011369 (1961-12-01), Russell
patent: 3071991 (1963-01-01), Vernooy
patent: 3257896 (1966-06-01), Mills
patent: 3630632 (1971-12-01), Holleman
patent: 4422811 (1983-12-01), Ellison
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