Back-up power tongs

Details Back-up power tongs Back-up power tongs

1985-08-29

1987-03-17

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5721, 81 5734, B25B 1350, B25B 2100

Patent

active

046497773

ABSTRACT:
Back-up power tongs are provided, for holding a tubular member, such as a drill pipe, against rotation of a connected tubular member, the back-up tongs comprising a body, having a center opening of sufficient size for the tubular member to pass therethrough, a slot communicating between the edge of the body and the center opening, and a cavity disposed within the body. A plurality of jaw members are disposed within the body around the perimeter of the center opening, each jaw member having a concave surface generally conforming to the curvature of the tubular member and facing the interior of the opening so as to be grippingly engageable with the tubular member. At least one cylinder assembly is disposed within the cavity and fixedly connected to one jaw member so as to extend or retract the jaw member on a radial path centered at the center of the tubular member.

REFERENCES:
patent: 3796418 (1974-03-01), Carlberg
patent: 3921473 (1975-11-01), Boyadjiett et al.
patent: 4345493 (1982-08-01), Rassieur
patent: 4402239 (1983-09-01), Mooney

Affiliated with

Also associated with

Rating

Back-up 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 Back-up power tongs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Back-up power tongs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1780610