Abstract: A clamp of the type comprising a body which, equipped with a gripper has a clevis-shaped part consisting, on the one hand, of a fixed jaw and, on the other hand, of a mobile jaw in the shape of a pivoting cam subjected to the action of a spring, the mobile jaw being releasable from its open position by a trigger pivotably mounted on the body and protruding inside the clevis. This clamp comprises a locking hook for locking the mobile jaw in the open position, independently of the trigger and actuatable by the latter during its pivoting motion in a direction of disengagement of the opening of the clevis, under the pressure of a sheet or the like.

Abstract: A clamping device for handling and lifting metal sheets is disclosed. The device has a body member with a first flanged portion and a second flanged portion mounted adjacent to the first flanged portion. The first and second flanged portions define an opening therebetween for receiving metal sheets therebetween. A cam member includes an adjustable grip portion and an opposite leg portion. The cam member is attached to the first flanged portion so as to permit the adjustable grip portion to rotate in the opening from a first open position to a second closed position. The cam member is biased to a closed position by a helical spring member acting on the opposite leg portion. The spring member is supported on the other end by the body member and coiled about a pivot pin. The cam member is automatically locked in an open position by a lever engaging a pin on the cam member adjacent the adjustable gap portion. One leg of the lever arm extends through the opening between the two flanged portions.