Drill/countersink nosepiece assembly

Details Drill/countersink nosepiece assembly Drill/countersink nosepiece assembly

1998-04-14

1999-09-07

Bishop, Steven C.

Cutting by use of rotating axially moving tool

With work-engaging structure other than tool or tool-support

408 97, 408112, B23B 4902

Patent

active

059476540

ABSTRACT:
The drill/countersink nosepiece assembly of the present invention permits the fabrication of a precise hole and countersink in a structural assembly workpiece in a single operation with the aid of a drill plate or other hole template. The small size of the nosepiece tip enables multiple holes to be closely spaced without interference between drill plate engagement slots. A close fit between the shaft of the rotating drill/countersink bit and the inner surface of the sleeve prevents the bit from wandering upon repeated or heavy use. The drill/countersink nosepiece comprises a combination drill/countersink bit to be received by a drill motor chuck, a bushing to be received by a fixed housing portion of the drill motor, a sleeve telescopically mounted within the bushing, a spring within the bushing to bias the sleeve forward, and fingers or other features at the end of the sleeve for engaging an alignment slot in a drill plate. In operation, the nosepiece is attached to a power feed or hand-held drill motor and tooling slots or other features about the hole template in the drill plate are engaged by the sleeve fingers, which extend longitudinally from the retractable sleeve and lie within the infinite cylinder defined by the outer diameter of the sleeve. The drill/countersink nosepiece is adapted to be mated interchangeably with power feed and hand-held drill motor units.

REFERENCES:
patent: 2461716 (1949-02-01), Blatt
patent: 2539223 (1951-01-01), Bellek
patent: 3060772 (1962-10-01), Crump
patent: 3874808 (1975-04-01), Zaccardelli et al.
patent: 4674164 (1987-06-01), McCloskey
patent: 5033917 (1991-07-01), McGlasson et al.

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