Tool wrench

Claim 2

In a tool wrench for holding sections of a drill string of a drilling apparatus, the combination comprising: a mounting arm pivotably connected at one end to the drilling apparatus and swingable about an axis parallel to a drill string axis of the drilling apparatus; a pair of chucks slidably attached upon said mounting arm for movement towards and away from each other and adapted to close around a section of a drill string, said chucks being upwardly pivotable about the longitudinal axis of said mounting arm; a first hydraulic cylinder pivotal with said mounting arm and Having ends each being fixed to one of said chucks for moving said chucks along said mounting arm; and a second hydraulic cylinder associated with the drilling apparatus and having one end joined to said mounting arm for swinging said mounting arm towards and away from a drill string.

Claim 3

A tool wrench as in claim 1, wherein said mounting arm comprises a cylinder having stop elements affixed thereto for limiting the outermost movement of said chucks.

Claim 4

A tool wrench as in claim 2, wherein each of said chucks includes a tubular sleeve slidably engageable with said mounting arm and a jaw secured to said tubular sleeve.

Claim 5

A tool wrench as in claim 3, wherein each said jaw has a tooth biased outwardly and engageable with recesses formed on the sections of a drill string to prevent loosening thereof.

Claim 6

A tool wrench as in claim 4 having a hinge coupling which comprises an upright spindle joined to the drilling apparatus, a post connected with said mounting arm and having a transfer link extending therefrom, said post being disposed on said spindle for rotation thereabout and said transfer link being connected to one end of said second hydraulic cylinder.

Claim 7

In a tool wrench for holding sections of a drill string of a drilling apparatus, the combination comprising: a circular, cylindrical mounting arm pivoted at one end to swing about an axis parallel to a drill string axis of the drilling apparatus; a hinge coupling connecting the one end of said mounting arm to the drilling apparatus; a swing actuator associated with the drilling apparatus and having one end joined to said hinge coupling for swinging said mounting arm towards and away from a drill string; a pair of chucks slidably attached upon said mounting arm for movement towards and away from each other and adapted to clamp around a section of a drill string, said chucks being pivotable about the longitudinal axis of said mounting arm; and a clamp actuator pivotal with said mounting arm and having ends each being fixed to one of said chucks for moving said chucks along said mounting arm.

Claim 8

In a tool wrench for holding sections of a drill string of a drilling apparatus, the combination comprising: a circular, cylindrical mounting arm pivoted at one end to swing about an axis parallel to a drill string axis of the drilling apparatus; a hinge coupling connecting the one end of said mounting arm to the drilling apparatus; a swing actuator associated with the drilling apparatus and having one end joined to said hinge coupling for swinging said mounting arm towards and away from a drill string; a pair of chucks slidably attached upon said mounting arm for movement towards and away from each other and adapted to clamp around a section of a drill string, said chucks being pivotable about the longitudinal axis of said mounting arm; and a clamp actuator pivotal with said mounting arm and having ends each being fixed to one of said chucks for moving said chucks along said mounting arm.

Claim 9

In a tool wrench for holding sections of a drill string in a drilling apparatus, the combination comprising: a mounting arm with a circular, cylindrical surface extending longitudinally of its length, and pivoted at one end for swinging movement toward and away from a drill string of the drilling apparatus, such movement being in a plane substantially perpendicular to said drill string; a pair of sleeves encircling and slidable along said circular, cylindrical surface in converging and diverging movement with respect to one another, which sleeves are also free to rotate about said surface; a pair of chuck jaws, one on each of said sleeves, extending radially outward from said mounting arm and positioned in a facing relation to converge upon and diverge from one another in unison with sleeve movements, said jaws also being swingable upward upon a rotation of said sleeves; and an extendable and retractable clamp actuator connected between said sleeves for imparting said converging and diverging movements, such movements tightening said jaws upon and releasing them from said drill string when said jaws are positioned on opposite sides thereof by a pivoted movement of said mounting arm, said upward swinging of said jaws permitting maintenance of jaw engagement with said drill string upon occurrence of an upward displacement of the drill string.

Claim 10

In a tool wrench for holding sections of a drill string in a drilling apparatus, the combination comprising: a mounting arm with a circular, cylindrical surface extending longitudinally of its length, and pivoted at one end for swinging movement toward and away from a drill string of the drilling apparatus, such movement being in a plane substantially perpendicular to said drill string; a pair of sleeves encircling and slidable along said circular, cylindrical surface in converging and diverging movement with respect to one another, which sleeves are also free to rotate about said surface; a pair of chuck jaws, one on each of said sleeves, extending radially outward from said mounting arm and positioned in a facing relation to converge upon and diverge from one another in unison with sleeve movements, said jaws also being swingable upward upon a rotation of said sleeves; and an extendable and retractable clamp actuator connected between said sleeves for imparting said converging and diverging movements, such movements tightening said jaws upon and releasing them from said drill string when said jaws are positioned on opposite sides thereof by a pivoted movement of said mounting arm, said upward swinging of said jaws permitting maintenance of jaw engagement with said drill string upon occurrence of an upward displacement of the drill string.