Power tongs

Tools – Wrench – screwdriver – or driver therefor – Machine

Reexamination Certificate

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Details

C081S057200, C081S057330

Reexamination Certificate

active

06990876

ABSTRACT:
A power tong apparatus for rotating a pipe comprises a tong housing and a ring gear, rotatably mounted in the tong housing. A top cage plate is positioned above an inner portion of the ring gear and a corresponding bottom cage plate is positioned below the inner portion of the ring gear. The cage plates form a cage rotatable with respect to the tong housing and the ring gear. A jaw is pivotally attached to the cage and grips the pipe when the ring gear is rotated with respect to the cage. The cage plates are fastened together by a fastener extending through a slot in the ring gear located between the inner and outer peripheries of the ring gear, such that the cage plates can rotate with respect to the ring gear through a limited arc.

REFERENCES:
patent: 3023651 (1962-03-01), Wallace
patent: 4290304 (1981-09-01), Eckel
patent: 4346629 (1982-08-01), Kinzbach
patent: 4401000 (1983-08-01), Kinzbach
patent: RE31699 (1984-10-01), Eckel
patent: 4986146 (1991-01-01), Buck
patent: 5048377 (1991-09-01), Varis
patent: 5394774 (1995-03-01), Dlask
patent: 6070500 (2000-06-01), Dlask
patent: 6082224 (2000-07-01), McDaniels et al.
patent: 6223629 (2001-05-01), Bangert
patent: 6327938 (2001-12-01), Pietras
patent: 6446524 (2002-09-01), Gravouia
patent: 6619160 (2003-09-01), Buck et al.

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