Apparatus for making and breaking joints in drill pipe strings

Details Apparatus for making and breaking joints in drill pipe strings Apparatus for making and breaking joints in drill pipe strings

1995-08-14

1999-02-09

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5716, 81 5721, B25B 1350

Patent

active

058680454

ABSTRACT:
Apparatus for making and breaking joints in drill pipe strings has three jaws each of which is adjustable to an infinite number of settings. The jaw-adjustment means are symmetrical about a central plane, and incorporate a spherical section. Different portions of the spherical section operate relative to closing and self-energizing of each jaw, the particular operative portion depending upon the exact set or adjusted position of the jaw. Each jaw is constructed for stable clamping of a drill type portion, with only one side of each jaw having a die element that is rotatably mounted. The jaw-adjustment mechanism effects both opening and closing of the jaw, there being no necessity to manually pull on a jaw portion at any time.

REFERENCES:
patent: 2959996 (1960-11-01), Wheeler
patent: 4706528 (1987-11-01), Inoue
patent: 5044232 (1991-09-01), Schulze-Beckinghausen
patent: 5060542 (1991-10-01), Hauk

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