E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 19/16 (2006.01) B25B 13/50 (2006.01)
Patent
CA 2259082
An open throat power tong includes a tong body 15 having an open throat 17 therein, a partial ring member 12 for rotating a tubular during a makeup or breakout operation, at least two heads 16 rotatable with the partial ring for gripping engagement with the tubular, and a drive motor 18, 20 for powering rotation of the partial ring. A door 40, 50 is pivotally connected to a tong body adjacent a side of the open throat to allow the power tong to be moved laterally on and off the tubular string. A latch arm 56, 84 is movable between a closed position and an opened position, with the latch arm including a latch head 58, 86 for engagement with a latch stop 60, 61 to latch the door in the closed position. A locking arm 66, 94 includes a locking member 70 for engagement with a locking stop 72. The door mechanism significantly reduces the force and effort required to reliably latch the door in the closed position, thereby improving tong safety.
Eckel Manufacturing Company Inc.
Taylor Euan R.
LandOfFree
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