Cooper Industries, Inc.

Edison International, Inc.

Moon Choung

Jerome Weiner

David Maye

The plate lifting clamp of the present invention includes linkage disposed on the clamp with one end of the linkage connected to the lifting shackle and the other end of the linkage connected to a cam rotatably mounted on the clamp. A spring on the linkage causes the cam to rotate against the work piece gripping the work piece between the cam and a swivel pad mounted on the clamp. A further force is applied to the rotation of the cam as the work piece is lifted on the lifting shackle by the hoist. An operating handle is rotatably disposed on the clamp whereby when rotated to the open position, will cause the cam to rotate away from the work piece and open the clamp. A spring biased locking mechanism is provided on the clamp to lock the operating handle into the open position.

Plate lifting clamp

A plate lifting clamp has an eccentric cam with spaced apart rounded teeth having sharp crested edges which are provided with gauge marks extending into each tooth. Excessive wear on the teeth may be visually observed by comparing the worn portion of each tooth to the location of the gauge marks.

Lifting clamp cam wear indicator and method

A clamp suitable for a wide variety of uses is provided. The clamp is particularly suitable for selectively either rotating a variety of standard structural workpieces so that they rest on a new base after a lift, or lifting workpieces so that they rest on their original base after a lift. The invention includes a swivel pad having at least two faces and a settable jaw for retaining workpieces. A selection of one face to engage a workpiece will cause it to rest on a new base after a lift, and the selection of another will cause the workpiece to rest on its original base after a lift.

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Bayside, NY, United States of America

Moon Choung