| 摘要 |
Apparatus for positively retaining drill pipe tongs at a desired position horizontally displaced from a center of a rig floor. The apparatus includes a latch connected to a removable stand which places the latch at a desired height above the rig floor and a desired horizontal displacement from the center of the rig floor. The latch includes a jaw having an elongated channel. A retainer arm is rotatably attached to the jaw and is spring biased between a first closed position, where the retainer arm obstructs the channel, and a second open position, where the retainer arm does not obstruct the channel. A catch piece, including a generally vertically disposed tubular member sized to fit in the retainer arm, is attached to a set of tongs. The tongs are pushed away from the center of the rig floor, and the catch piece is guided into the channel of the jaw, displacing the retainer arm from the first closed position and permitting the catch piece to move toward the terminus of the channel. Further movement of the catch piece past the retainer arm permits the catch piece to clear the retainer arm and the retainer arm to move into a second closed position, trapping the catch piece in the channel, thus retaining the drill pipe tongs at a desired position horizontally displaced from the center of the rig floor.
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