Device for and method of enlarging and center displacing an open

Details Device for and method of enlarging and center displacing an open Device for and method of enlarging and center displacing an open

1998-03-23

1999-02-16

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408 72B, 408 72R, 408204, 408241B, B23B 3500

Patent

active

058713107

ABSTRACT:
A device (10) for use in combination with a hole saw (12) of the type including a cylindrical hollow body (14) having a circular lower cutting edge (16), a top mandrel (18) with a shank (20) in engagement with a chuck (22) of a drill (24) and a pilot bit (26) for guiding the hole saw (12) when cutting a new opening in a workpiece (28) having a predrilled opening (30), in which the center of the new opening lies within the predrilled opening (30). The device (10) comprises a dowel plug (32) having a plurality of holes (34) therethrough. The dowel plug (32) is inserted into the predrilled opening (30), so that the pilot bit (26) of the hole saw (12) can be positioned in a rotatable manner into one of the holes (34) in the dowel plug (32) on center or off center with the predrilled opening (30) in the workpiece (28).

REFERENCES:
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patent: 4131385 (1978-12-01), Narang
patent: 4280776 (1981-07-01), Chaconas et al.
patent: 4307983 (1981-12-01), Blough et al.
patent: 4579486 (1986-04-01), Damico
patent: 4971484 (1990-11-01), Specktor
patent: 5143489 (1992-09-01), Bogner et al.
patent: 5366326 (1994-11-01), Converse
patent: 5415502 (1995-05-01), Dahlin
patent: 5664913 (1997-09-01), Scholz

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