A tong, preferably a power tong, with one or more floating jaws which are releasably retained on and selectively movable with a rotary device; in one aspect the jaws having a compound jaw camming surface with a primary cam action surface, a rest surface, and a fixed positioning surface; and in one aspect...http://www.google.es/patents/US5207128?utm_source=gb-gplus-sharePatente US5207128 - Tong with floating jaws
