Hole saw driver-extruder and hole enlarger

Details Hole saw driver-extruder and hole enlarger Hole saw driver-extruder and hole enlarger

1989-10-20

1990-11-06

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408 80, 408204, 408209, B23B 3500, B23B 5105

Patent

active

049681893

ABSTRACT:
A device is disclosed for driving conventional hole saws and for extruding sawed material from within said saws after sawing. An internally right hand threaded shank is attached to the outer base end of a conventional hole saw. A cooperating mandrel is threaded into the shank from within the hole saw. The end of the mandrel remaining in the hole saw forms wing-like projections which spiral into the hole saw as the mandrel is threaded into the shank. A sleeve freely mounted on the shank contains pins which protrude into the saw through complimentary holes provided in the base of the conventional hole saw to obstruct the spiral motion of the mandrel projections to transfer torque from the mandrel to the saw for sawing, and the sleeve is moved away from the hole saw on the shank, withdrawing the pins from within the saw to free the mandrel to thread out through the saw to extrude sawed contents therefrom. In an altered mode, a supplementary mandrel is secured in the end of the first mandrel for retaining a second saw in the first saw to pilot the first saw into a hole to be enlarged and to stabilize the first saw concentrically around the hole to a saw a concentric enlargement thereof.

REFERENCES:
patent: 3784316 (1974-01-01), Bittern
patent: 4036560 (1977-07-01), Clark et al.
patent: 4148593 (1979-04-01), Clark
patent: 4749315 (1988-06-01), Mills

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