Combination screw-tapping and screwdriving tool

Details Combination screw-tapping and screwdriving tool Combination screw-tapping and screwdriving tool

1987-06-11

1989-01-10

Parker, Roscoe V.

Compound tools

Cutter combined with other tool or tools

7165, 408225, B25F 300

Patent

active

047963190

ABSTRACT:
A drill accessory kit for mounting screw-type fasteners is comprised of several drill bit holders and a screwdriving attachment. The bit holder engages a common twist drill bit in the chuck of a drill and allows one to drill a pilot hole to a desired depth in a workpiece with a cutting action which provides a proper-shaped hole for clean flush mounting or countersinking of a screw. Subsequently, the screwdriver attachment slips over the drill bit and engages with the bit holder, allowing a quick change from drilling to powerdriving of a screw.

REFERENCES:
patent: 162315 (1875-04-01), Shaw et al.
patent: 385791 (1888-07-01), Carpenter
patent: 524906 (1894-08-01), McDougall
patent: 679693 (1901-07-01), Burkhart
patent: 1678124 (1928-07-01), Perreault
patent: 3336611 (1967-08-01), Schepp
patent: 3575520 (1971-04-01), Halpern
patent: 4092753 (1978-06-01), Fuhrmann
patent: 4218795 (1980-08-01), Ernst

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