Power tong

A jaw assembly comprising, a jaw body having integral means for defining a pivot axis about which said body rotates in either one of opposite directions, said body having a pair of surface portions having extents converging towards an apex spaced laterally outermost from said pivot axis, said pivot axis being disposed adjacent a distal end of said jaw body with respect to said apex, member engaging cam die means supported by said surface portions respectively, one of said die means having an outer surface of a configuration to provide driving engagement for a member upon pivotal movement of said body about said pivot axis in one direction, the other said die means having an outer surface of a configuration to provide driving engagement for a member upon pivotal movement of said body member about said pivot axis in direction opposite said one direction, pin means received within said integral means and secured thereto, and gear means projecting generally radially with respect to said pivot axis means for effecting rotary motion to said jaw body through said pin means.

A tong assembly comprising, a housing having an axial extent with an open ended passageway extending inwardly from one side thereof with the inner portion of said passageway having a central axis extending transversely of said axial extent, means movably supported by said housing and extending in circumferentially spaced relationship with respect to said central axis, drive means carried by said housing and cooperable with said means for selectively rotating said means in either one of opposite directions about said central axis, jaw means bodily carried by said means for movement into position within said passageway in circumferentially spaced relationship with respect to said central axis and positions spaced radially outwardly from said first mentioned positions with respect to said central axis, each said jaw means having cam means for engaging a portion of a member extending axially within said passageway, and said means for movement having a circumferentially and radially open extent with respect to said axis.

A tong assembly comprising, a housing having a through opening therein with a central axis, said housing having alignable openings therein to provide an open head structure, a rotor movably supported by said housing and extending circumferentially with respect to said central axis, a power output drive carried by said housing and cooperable with said rotor for selectively rotating said rotor in either one of opposite directions about said central axis, a plurality of jaw members bodily carried by said rotor in circumferentially spaced relationship with respect to said central axis, each of said jaw members having convergent cam surfaces, each of said jaw members being movable between spaced positions relative to said rotor which are arcuately spaced relative to said central axis with the path of movement between such positions being at least in part within said opening, means supported by said housing and cooperable with all of said jaw members in one mode to selectively simultaneously move said jaw members into said positions upon rotation of said rotor in opposite rotational directions, respectively, and cooperable with said jaw members in another mode to rotate bodily with said jaw members.