Self-centering clamp

Details Self-centering clamp Self-centering clamp

1979-09-11

1981-12-01

Marbert, James B.

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Locking device

414 22, B66C 142

Patent

active

043032702

ABSTRACT:
A self centering clamp for down-hole tubulars includes first and second opposed clamping members guided along a clamping axis by first and second guide channels defined by a frame. Each clamping member defines a hydraulic cylinder in which is disposed a piston which is rigidly mounted to the frame. A rack is coupled to move with each of the clamping members. These racks are interconnected via a pinion gear which meshes with both racks so that the two clamping members move in a counterdirectional manner and remain equidistant from a central point on the clamping axis. In this way the clamp centers down-hole tubulars of various diameters about the same line, perpendicular to the clamping axis.

REFERENCES:
patent: 3386726 (1968-06-01), Lorenz
patent: 3881761 (1975-05-01), Meyer et al.
patent: 4172684 (1979-10-01), Jenkins

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