Lifting tongs

Details Lifting tongs Lifting tongs

1987-07-13

1988-05-10

Marbert, James B.

Handling: hand and hoist-line implements

Grapple

Pivoted jaws

2941101, 294104, B25J 1500

Patent

active

047430567

ABSTRACT:
Improved lifting tongs are provided which are particularly suitable for use in lifting heavy sections of cylindrical pipe. The lifting tongs are comprised of first and second opposing jaws and first and second mounting plates which are respectively rigidly joined to the first and second jaws. The mounting plates are arranged in mutually overlapping parallel disposition in spaced separation from each other. First and Second crank or cam levers are interposed in the gap between the mounting plates, and are rotatably secured relative thereto. The crank levers have cam lobes which act against corresponding cam surfaces on the jaws to force the jaws together with about a 4 to 1 mechanical advantage when the tongs are lifted.

REFERENCES:
patent: 1457104 (1923-05-01), Connor et al.
patent: 3011821 (1961-12-01), Doty
patent: 3029100 (1962-04-01), Laine
Publication-Crescent Tongs-published by Crescent Tongs, Inc.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1315969