Abstract: A clamping apparatus for lifting objects includes a frame and two or more clamping arms pivotably supported by the frame for movement into and out of contact with an object to be lifted. An internal support is supported by the frame for reinforcing the inner walls of a cavity in the object to be lifted. The insert may be supported by the frame for vertical movement with respect to the frame so that when the insert is not needed, it can be raised above the object. The insert may passively reinforce a cavity, or it may be equipped with movable reinforcing portions which can be moved into and out of contact with the walls of the cavity which is to be reinforced.

Abstract: A clamping apparatus for lifting objects includes a frame and first and second opposing clamping arms pivotably supported by the frame about first and second parallel axes. Each clamping arm has a contact portion. A drive member is connected to the first and second clamping arms to simultaneously pivot the first and second clamping arms about the first and second axes. The height of the contact portions when spaced apart by a first separation is the same as when spaced apart by a second separation. As a result, the clamping apparatus can securely grasp both square and elongated rectangular objects.