Abstract: A ratchet wrench includes a wrench body and a switch member that is operatively coupled to a gear engaging member so as to be accessible from an exterior of the wrench body. A spring applies a biasing force to the gear engaging member such that the gear engaging member having one or more engaging teeth engages with gear teeth of a torque receiving gear in intermeshed relation. A mounting element mounts the gear engaging member to the switch element. The gear engaging member is pivotally mounted to the mounting element. The pivotal mounting of the gear engaging member enables the gear engaging member to pivot relative to the mounting element as the gear engaging member moves between a first ratcheting position and a second ratcheting position thereof. Also provided is switch securing structure for securing the switch during operation of the ratchet wrench and a method of making the ratchet wrench.

Abstract: A ratchet wrench includes a wrench body and a switch member that is operatively coupled to a gear engaging member so as to be accessible from an exterior of the wrench body. A spring applies a biasing force to the gear engaging member such that the gear engaging member having one or more engaging teeth engages with gear teeth of a torque receiving gear in intermeshed relation. A mounting element mounts the gear engaging member to the switch element. The gear engaging member is pivotally mounted to the mounting element. The pivotal mounting of the gear engaging member enables the gear engaging member to pivot relative to the mounting element as the gear engaging member moves between a first ratcheting position and a second ratcheting position thereof. Also provided is switch securing structure for securing the switch during operation of the ratchet wrench and a method of making the ratchet wrench.

Abstract: A breakout wrench for making and breaking joints between successive drill pipe in a drill string on a drilling rig includes a swing arm pivotable between a storage and a pipe gripping position. The swing arm carries a first and second pipe gripping jaw, the first jaw movable relative to the swing arm, and the second jaw movable relative to the first jaw. Both jaws are freely movable, to a slight degree, in all directions in the plane of their movement, to permit self-adjustment of position to the wrench relative to a drill pipe centerline. A double-rod hydraulic cylinder actuates both jaws.

Abstract: A hydraulic system for moving a drilling head in a rectilinear motion between a mast crown and a mast table on a drilling machine includes a double rod hydraulic cylinder connected at a bottom end to a mast table and at a top end to a traveling sheave block; first and second flexible connector members for connecting a drilling head to the mast through the sheave block; and hydraulic feed circuitry for actuating the cylinder to move the sheave block and drilling head alternately in a first pulldown direction and in a second pullback direction.