US 4,312,610 A · Sheet material cutting device

Abstract

A generally portable sheet material cutting tool comprising apparatus having a substantially stationary sleeve member with a free end and a cutting tool reciprocable within the sleeve member, the cutting tool having both a transverse cutting edge formed along its length cooperable with the free end of the sleeve member and an initial hole forming means extending beyond the free end of the sleeve member. The reciprocation of the cutting tool is effected by cam means acting in response to rotary motion supplied by a hand held drill unit or by a rotary drive motor, the cam means being capable of being disengaged by axial pressure applied to the initial hole forming means. In one form of the apparatus the transverse cutting edge is given both a reciprocating and a rotating component of motion, and in a modified form of the apparatus the transverse cutting edge is restrained for reciprocating movement only.

Claims19

Dependent claims

A device for cutting sheet material comprising:

a cutter having rotatable hole cutting means at one end thereof for creating an initial opening in said sheet material and a cutting edge transverse to the axis of rotation of said hole cutting means, said transverse cutting edge being arranged axially spaced from said hole cutting means;
and said device further including an element cooperable with said transverse cutting edge, said element and said transverse cutting edge being relatively reciprocable whereby, in use, said transverse cutting edge engages with an edge of said sheet material to remove material therefrom.

A device adapted for cutting sheet material comprising:

(a) a support body;
(b) a drive shaft adapted for connection with drive means whereby said drive shaft is rotatable;
(c) cutting tool means arranged for movement relative to said drive shaft between a first position where said cutting tool means is rotatable without reciprocation with said drive shaft and a second position where said cutting tool means is disengaged from rotation for reciprocation only, said cutting tool means having an elongated shank region, a drill point at a free end of said shank region and a recess formed in the periphery of said shank region forming at least one transverse cutting edge axially spaced from the drill point;
(d) a sleeve member having an axially extending bore adapted to receive the shank region of said cutting tool means such that the drill point extends beyond a free end region of said sleeve member, said sleeve member being adapted to be held substantially stationary relative to said support body;
(e) cam means operable between said drive shaft and said cutting tool means to effect reciprocation without rotation of said cutting tool means upon rotation of said drive shaft;
(f) first positive engagement surfaces cooperable between said sleeve member and said cutting tool means being operable, when engaged, to restrain said cutting tool means for axial reciprocation without rotation relative to said sleeve member;
and
(g) resilient biasing means urging said cam means and said first positive engagement surfaces into interengagement but enabling disengagement of said cam means and said first positive engagement surfaces upon a predetermined axial load being applied to the drill point of said cutting tool means whereby said cutting tool means is movable to said first position.

5 more elements

Dependencies are inferred from the claim text.

Sheet material cutting device

Life of this patent

Sheet material cutting device

Life of this patent

Abstract

Claims19