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US 4,709,599 AGranted
Compensating jaw assembly for power tongs
OwnerDavid A. Buckinventor
Life of this patent
Estimating the term…
Abstract
A pipe die linkage for power tongs has a preloaded spring between a force producing cam follower and pipe die of such strength and preload that the die serrations will be forced to adequately bite into the pipe. Bias resisted overtravel will prevent pipe crushing at high torque levels, as the cam follower is forced more toward the pipe.
Claims4
An improved pipe gripping assembly for use in powered pipe tongs having:
- (a) pipe gripping means mounted on said power tong and arranged to move toward and away from a pipe gripping position;
- (b) cam follower means mounted on the power tong and arranged to move said pipe gripping means in response to movement of actuator means of the tong for developing gripping force;
- the improvement comprising:
- (c) biased overtravel means situated to transmit the principle gripping forces between said pipe gripping means and said cam follower means and to permit bias resisted relative motion therebetween when gripping forces applied to the pipe exceed a preselected amount;
- and
- (d) means mounting said pipe gripping means and said cam follower means, for said relative movement, on the pipe tong.
3 more elements
Dependencies are inferred from the claim text.