Importance

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Abstract

A tong having a flexible belt and an anchor member for it. A belt assembly for mounting, disposing, and moving a flexible belt in a tong or in the rotary of tongs having rotary elements. One embodiment of such a tong for rotating a tubular member according to the present invention has a housing; a rotary element in the housing which is either turned manually or power driven; mount plates (which can also serve as brake plates) disposed within the housing and movable therein with respect to the rotary element and, upon the action of other member, movable with the rotary element; an anchor assembly mounted to the mount plates; the anchor assembly having an exterior cam surface; a belt carrier movably mounted to the rotary element; the belt carrier having a cam follower for contacting and following the cam surface of the anchor assembly; a flexible belt extending from the anchor assembly to the belt carrier, the belt being tightened around the tubular as the rotary and belt carrier rotate to the point where a portion of the belt is wrapped around the tubular and the belt carrier's cam follower has moved to contact the cam surface of the anchor assembly, and the anchor assembly and mount plates then move with the rotary to rotate the tubular. An anchor assembly with an exterior cam surface. A belt holder for holding a belt and for tightening it.

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First Claim