Gripping clamp

Claim 1

A MATERIAL HANDLING CLAMP COMPRISING A PAIR OF LEVERAGE MEMBERS PIVOTALLY CONNECTED INTERMEDIATE THEIR ENDS, SAID MEMBERS HAVING INWARDLY OPPOSED RELATIVELY WIDE GRIPPING JAWS ON ONE END, LINK MEANS PIVOTALLY CONNECTED TO THE OPPOSITE ENDS OF SAID MEMBERS, MEANS FOR CONNECTING SAID LINK MEANS TO APPLY FORCE TO SAID LEVERAGE MEMBERS AND MOVE SAID GRIPPING JAWS TOWARD EACH OTHER, AT LEAST ONE OF SAID JAWS HAVING AN ELONGATED GENERALLY PLANAR GUIDING PORTION DISPOSED GENERALLY RADIALLY WITH REGARD TO SAID PIVOTAL CONNECTION, AN ARCUATE CAMMING SURFACE AT THE END OF SAID PLANAR PORTION REMOTE FROM SAID PIVOTAL CONNECTION, SAID ARCUATE CAMMING SURFACE TERMINATING IN AN ELONGATED SUBSTANTIALLY U-SHAPED RECESS EXTENDING OUTWARDLY GENERALLY AT A RIGHT ANGLE TO SAID PLANAR PORTION AND HAVING A DEPTH SUBSTANTIALLY GREATER THAN THE DISTANCE ACROSS THE MOUTH OF THE RECESS WHEN MEASURED ALONG A LINE EXTENDING RADIALLY OF SAID PIVOTAL CONNECTION, WHEREBY THE FLANGE OF A STRUCTURAL MEMBER MAY BE SLIDINGLY ENGAGED BY SAID PLANAR PORTION AND GUIDED INTO A POSITION TO BE GRIPPED BY SAID JAWS.