Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2006-01-31
2006-01-31
Thomas, David B. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
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.
Nixon & Vanderhye P.C.
Thomas David B.
LandOfFree
Power tongs does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power tongs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power tongs will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3558658