Patent ID: 7882767

Claim:
A power tong, comprising: a) a ring gear comprising gear teeth and having a rotational axis, and further comprising a set of spaced apart upper and lower circumferential load support surfaces, disposed inclined to said rotational axis; b) a plurality of dumbell rollers, each of said plurality of dumbell rollers having a rotational axis and comprising a set of spaced apart upper and lower circumferential load support surfaces, disposed inclined to said rotational axis; and wherein: said ring gear and said dumbell rollers are sized and positioned so that said spaced apart circumferential load support surfaces, disposed inclined to said rotational axis, on said ring gear and said plurality of dumbell rollers, are in operational contact, so that vertical and horizontal loads on said ring gear are transferred to said dumbell rollers, and said teeth of said ring gear do not contact said dumbell rollers.