Dual camming action jaw assembly and power tong
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United States of America Patent
Stats
-
Mar 20, 1984
Grant Date -
N/A
app pub date -
Jun 29, 1981
filing date -
Jun 29, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary tong for use in well drilling operations to make up and break out drill strings or similar axially elongated objects which has a secondary camming action provided by the jaw assembly. By use of the inventive jaw assembly a secondary camming action is produced which reduces the cam angle of the primary camming function. The reduced cam angle gives greater gripping force thereby reducing slippage. The secondary camming function also allows the jaw to be used for a greater variety of drill string sizes thereby reducing the need to change tongs or jaw elements when drill string sizes change.
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