Abstract: A tong assembly for use in making-up and breaking-out joints of varying diameter. The tong assembly includes a housing, a carrier element, at least one jaw, a link corresponding to each jaw and pivotably connected to the carrier element and to which the corresponding jaw is pivotably connected, a drag means, and a brake means. A power means may be connected to the tong assembly to drive the tong and a backup tong may be secured relative to the housing and to the power means of the tong assembly.

Abstract: A tong assembly for use in making-up and breaking-out joints of varying diameter. The tong assembly includes a housing, a carrier element, at least one jaw, a link corresponding to each jaw and pivotably connected to the carrier element and to which the corresponding jaw is pivotably connected, a drag device, and a brake. A power device may be connected to the tong assembly to drive the tong and a backup tong may be secured relative to the housing and to the power device of the tong assembly.

Abstract: A coupling for use with two relatively movable members to transmit force between the members comprising a resilient coil element having convolutions positioned between the members and a solid core element positioned within the convolutions of the resilient element, the resilient element being positioned such that relative movement of the members urges the convolutions into frictional engagement with both of the members. The solid core element is of a size such that when frictional engagement of the members with the convolution occurs, the convolutions are prevented from being distorted beyond their elastic limit to thereby cause permanent set of the resilient element.