Power tong with improved guard and method
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United States of America Patent
Stats
-
Jul 16, 1996
Grant Date -
N/A
app pub date -
Apr 12, 1994
filing date -
Apr 12, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for an open throat power tong is provided to cover the rotary region of the power tong, including the pipe slot, wherein numerous moving parts may cause injury due to accidentally misplaced fingers or hands. Top and bottom movable guard portions, movable between open and closed positions, operate in conjunction with top and bottom fixed guard portions to cover the rotary region. When the movable guard portions are in the open position, hydraulic oil flow to a hydraulic power tong motor is completely blocked rather than diverted so as to avoid slow creep of the motor. Sensors that detect the open and closed position of the guards are placed in series so that all sensors must be shifted to allow tong motor operation. The movable guard portions may be pivotally mounted to a rear segment of the fixed guard portion.
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Family
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Cited Art Landscape
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