Reversal mechanism for power tong

Details Reversal mechanism for power tong Reversal mechanism for power tong

1981-12-11

1984-03-13

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Machine

294114, B25B 1700

Patent

active

044360029

ABSTRACT:
A power tong unit which is operable as a closed head or open head unit. The jaws of the tong unit are rotatable to an extended pipe gripping position from either of opposite directions to make-up or break-out pipe from a single retracted position. An improved reversal means controls the direction of rotation of the jaws between the make-up and break-out positions.

REFERENCES:
patent: 1811666 (1931-06-01), Foster
patent: 2263267 (1941-11-01), Franklin
patent: 2370837 (1945-03-01), Boynton
patent: 2613564 (1952-10-01), Walraven et al.
patent: 2657014 (1953-10-01), Webster
patent: 3196717 (1965-07-01), Sheppard
patent: 3610640 (1971-10-01), Bollin et al.
patent: 4005621 (1977-02-01), Turner et al.
patent: 4060014 (1977-11-01), Turner
patent: 4170908 (1979-10-01), Peveto et al.
patent: 4372026 (1983-02-01), Mosing

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