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OwnerGerhard Heitze, Ulrich Grebe +1inventors
InventorsGerhard Heitze, Ulrich Grebe, Klaus Baumer
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The invention relates to crank scissors, especially for cutting rolling strips (22), comprising two pairs of blades (3, 4) which can be secured to blade carriers (1, 2). The blade carriers (1, 2) are arranged in an opposite position on a vertical plane (x-x) in a pair of eccentric drive shafts (5, 6). Double-joint arrangements (9, 10) are maintained in a pivoatable manner on torque-supporting levers (7, 8) co-operating with hydraulic control units (11, 12) engaging thereon. Said type of crank scissors can be improved by enabling the blade carriers (1, 2) to form pairs of bearing surfaces (16-19), which are parallel to the axis, for the pairs of blades (3, 4) on approximately radial projections (13-15), whereon the upper pair of blades (3) is arranged on the inner, bearing surfaces (16, 17) of an arc-shaped recess (20) of the upper blade carrier (1) which are orientated towards each other, and the lower pair of blades (4) is arranged on a relatively narrow projection (15) on the outer bearing surfaces (19, 18) thereof.
Crank shear, especially for cutting rolled strip (22), which comprises two pairs of blades (3, 4) that can be mounted on blade holders (1, 2), wherein the blade holders (1, 2) are supported opposite each other in a vertical plane (x-x) in a pair of eccentric drive shafts (5, 6) and are pivoted on torque supporting levers (7, 8) in double-joint mechanisms (9, 10) in interaction with two hydraulic control units (11, 12) that act on these double-joint mechanisms (9, 10), wherein the blade holders (1, 2) form axially parallel pairs of bearing surfaces (16-19) for the pairs of blades (3, 4) on approximately radial projections (13-15), with the upper pair of blades (3) arranged on inner, oppositely oriented bearing surfaces (16, 17) of a curved recess (20) of the upper blade holder (1), and with the lower pair of blades (4) arranged on the outer bearing surfaces (19, 18) of a relatively narrow projection (15) oriented towards the recess (20), and wherein in a spread position of the torque supporting levers (7, 8) of approximately 90° and at the greatest separation (d) of the eccentric shafts (5, 6) and a running direction (21) of the rolled strip (22) towards the supporting levers (7, 8), a passage position of the crank shear is reached, in which the control unit (12) on the lower supporting lever (8) of the double-joint mechanism (10) is fully retracted, and the control unit (11) on the upper supporting lever (7) of the double-joint mechanism (9) is fully extended (FIG. 2).
Crank shear, especially for cutting rolled strip (22), which comprises two pairs of blades (3, 4) that can be mounted on blade holders (1, 2), wherein the blade holders (1, 2) are supported opposite each other in a vertical plane (x-x) in a pair of eccentric drive shafts (5, 6) and are pivoted on torque supporting levers (7, 8) in double-joint mechanisms (9, 10) in interaction with two hydraulic control units (11, 12) that act on these double-joint mechanisms (9, 10), wherein the blade holders (1, 2) for axially parallel pairs of bearing surfaces (16-19) for the pairs of blades (3, 4) on approximately radial projections (13-15), with the upper pair of blades (3) arranged on inner, oppositely oriented bearing surfaces (16, 17) of a curved recess (20) of the upper blade holder (1), and with the lower pair of blades (4) arranged on the outer bearing surfaces (19, 18) of a relatively narrow projection (15) oriented towards the recess (20), and wherein in a position of the upper supporting lever (7) that is downwardly inclined towards the rolled strip (22) with the upper hydraulic control unit (11) of the double-joint mechanism (9) retracted, and in a position of the lower supporting lever (8) that is upwardly inclined towards the rolled strip (22) with the lower control unit (12) of the double-joint mechanism (10) fully extended, and with the greatest separation (d) of the eccentric shafts (5, 6), the passage position through the shear is reached (FIG. 4).
Dependencies are inferred from the claim text.