(under subclass 93) Devices in which means are provided to grip the work on opposite sides of the portion which is to be severed, comprising two sets of gripping elements; and in which each set of elements is caused to impart movement to the work in a different direction or at a different speed
than the movement imparted to the work by the other set of elements, so as to stress the work beyond its yield point and thereby sever it between said two sets of elements.
(1) Note. Included in this subclass are patents wherein the work is moved in a single direction by a plurality of feed roll pairs, which pairs are driven at different speeds to stress the work between the pairs of rolls.
SEE OR SEARCH CLASS
72, Metal Deforming,
205, for a rolling-mill which includes means to tension the work, subclasses 274+ for a drawing apparatus which pulls work through a die, subclass 302 for the stretching of work between and by means to end clamps, subclass 392 for means to stretch work by relatively receding work-engaging tool faces, and subclass 395 for means to stretch flat work by using paired coplanar tool-faces engaging the work face and moving in opposite directions.
73, Measuring and Testing, 826+, and 856+ for gripping devices for determining tensile strength of material.
