Pipe gripping system and method

Details Pipe gripping system and method Pipe gripping system and method

1996-06-26

1998-03-31

Friedman, Carl D.

Supports

Pipe or cable

248 58, 248 741, 2483162, 2483163, 166209, F16L 318

Patent

active

057329095

ABSTRACT:
A slip die with a substantially smooth pipe contact surface is employed in a conventional slip assembly as a primary mechanism for gripping pipe. A second conventional slip assembly with conventional dies having penetrating die teeth on their contact surfaces is employed as a secondary gripping mechanism to automatically grip the pipe in the event the primary mechanism loses its grip. The smooth slip elements are constructed of a malleable material which tends to conform to surface irregularities on the outer surface of the pipe to increase the gripping force on the pipe. In the method, the pipe is initially gripped by the primary slip mechanism before the secondary mechanism is actuated to contact the pipe. The slips are set by downward pipe forces acting on the dies so that the die teeth of the secondary mechanism do not grip the pipe unless the primary slip mechanism fails. The system and method permit the pipe to be gripped without producing damaging die teeth marks on the pipe during normal pipe handling operations while providing a secondary mechanism which will automatically grip the pipe if the primary gripping mechanism fails.

REFERENCES:
patent: 2676036 (1954-04-01), Arrowood
patent: 2683046 (1954-07-01), Allen
patent: 2887754 (1959-05-01), Johnson
patent: 3127198 (1964-03-01), Orund
patent: 4202090 (1980-05-01), Cook
patent: 5042756 (1991-08-01), Pratt, Jr.
patent: 5120009 (1992-06-01), Sasin
patent: 5163642 (1992-11-01), Torrens et al.

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