US 4,635,514 A · Elliptical shearing apparatus

Abstract

A shearing apparatus for bar stock comprising a fixed die and a movable die wherein the movable die comprises a shearing ring carried by an arm at a location intermediate the ends of the arm, an eccentric fixed on a driven shaft is journalled in one end of the arm, and the other end of the arm includes a slot which receives a rotationally mounted slide block so that the slot and slide block coact to accommodate combined rotary and translatory movement of that end of the arm. The described arrangement produces an elliptical loop movement of the movable die relative to the fixed die to cleanly shear the stock. Also disclosed is a novel mandrel assembly including a pair of plug members adapted to be positioned within tubular stock to be cut wherein one of the plug members is mounted for selective radial excursion during the shearing operation to accommodate the eccentric movement of the movable die.

Claims5

Dependent claims

A shearing apparatus comprising:

(A) a fixed die comprising a first shearing ring defining a first die aperture to receive stock to be cut;
(B) a movable die comprising a second shearing ring defining a second die aperture having a size and shape generally corresponding to that of said first die aperture and having a neutral position in which its center is coaxial with the axis of said first die aperture to allow stock to be cut to be inserted through said first and second die apertures;
and
(C) means for moving said movable die in a manner to move said center of said second die aperture in a closed elliptical path passing through said axis and thereby shear the inserted stock at the interface of said fixed immovable dies, said moving means comprising
(1) an arm carrying said second shearing ring at a location intermediate the ends of the arm,
(2) a driven shaft,
(3) an eccentric fixed on said drive shaft and journalled in one end of said arm, and
(4) means mounting the other end of said arm for combined rotary and translatory movement.

5 more elements

Dependencies are inferred from the claim text.

Elliptical shearing apparatus

Life of this patent

Elliptical shearing apparatus

Life of this patent

Abstract

Claims5