US 4,354,411 A · Cold shears and method for cutting billets and bars

Abstract

The shears have a lower blade and an upper blade. The upper blade is reciprocated with respect to the lower blade through a transmission. The transmission includes a first eccentric which is continuously rotated to continuously reciprocate the upper blade over a vertical stroke equal to the throw of the first eccentric. This throw is transmitted to the upper blade through a second eccentric surrounding the first. The second eccentric is quickly rotatable, between two positions. In the first position, the upper blade is always clear of a billet on the lower blade. In the second position, the upper blade cuts the billet during the reciprocation. To ensure that the upper blade only penetrates approximately half the thickness of the billet, the position of the lower blade is vertically adjustable.

Claims6

Dependent claims

A method for shearing bars having a large cross-section, comprising:

(a) placing a bar to be sheared over a stationary shear blade;
(b) reciprocatingly moving a movable shear blade between upper and lower limits above said bar, so as not to contact said bar, by continuously rotating a crankshaft having an attachment connected to said movable shear blade;
and
(c) in response to the rotational position of said crankshaft, lowering said movable shear blade, on an up stroke of said reciprocating motion by rotating an eccentric mounted between said crankshaft and said movable shear blade to increase the distance between said movable shear blade and said crankshaft to lower said upper and lower limits by a distance sufficient to cause said movable shear blade to separate said bar entirely on the next successive down stroke of said reciprocating motion.

1 more element

Dependencies are inferred from the claim text.

Cold shears and method for cutting billets and bars

Life of this patent

Cold shears and method for cutting billets and bars

Life of this patent

Abstract

Claims6