CRANK SHEARS WITH TWO PAIRS OF KNIVES FOR CUTTING ROLLED STRIPS Russian patent published in 2008 - IPC B23D25/08 

FIELD: cutting devices.

SUBSTANCE: shears contain blade holders, two pairs of knives, supplementary drive shafts, instantaneous supporting arms and hydraulic executive agents. The pairs of knives are fastened onto the blade holders. The blade holders are positioned in a vertical plane opposite each other on a pair of supplementary drive shafts with a capability of turning on the instantaneous supporting arms in double hinged devices. Where the blade holders are made with the formation of almost radial projections located parallel to the pairs of flanking surfaces for the pairs of knives. In this case the top pair of knives situated on the inside directed towards each others surfaces scallop the top blade holders, and the lower pair of knives - on the outer surfaces directed towards scalloping a relatively more slender projection.

EFFECT: collision of the curved end of a strip is eliminated.

6 cl, 4 dwg