Cam follower for power tongs and other uses

Details Cam follower for power tongs and other uses Cam follower for power tongs and other uses

2007-05-22

2007-05-22

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Machine

C081S057210

Reexamination Certificate

active

10513018

ABSTRACT:
A power tong or back-up tong has a jaw assembly that is advanced into engagement with a pipe through a cam follower that contacts the camming surface on the inside circumference of a ring gear, the cam follower being in the form of a series of roller elements arranged as a circulating bearing. In a preferred form, the roller elements are cylindrical roller bearings and the jaw assembly is mounted for sliding advancement towards the pipe to be engaged. In an alternate variant the cam follower includes an indexing guide that maintains the cylindrical roller bearings in proper alignment.

REFERENCES:
patent: 5413416 (1995-05-01), Grunze et al.
patent: 5582483 (1996-12-01), Grunze et al.

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