Jaw assembly for power tongs and like apparatus

Details Jaw assembly for power tongs and like apparatus Jaw assembly for power tongs and like apparatus

1990-02-08

1991-03-19

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5715, 81 5733, 81467, 81472, 279 64, B25B 1700

Patent

active

050000659

ABSTRACT:
A jaw assembly for apparatus for gripping pipes, the apparatus being of the type having automatic means for exerting increased gripping force upon application thereto, is provided with a member having a concave surface which cooperates with a gripped pipe to override the automatic means for exerting increased gripping force. Having such a member, the jaw assembly of the present invention can exert a predetermined maximum gripping force on a gripped pipe notwithstanding amount of torque applied to the apparatus. Considering angular relationships involving jaw cam angle, the present invention can be manifested in an increasing cam angle jaw for power tongs.

REFERENCES:
patent: 1072142 (1913-09-01), Miller
patent: 2693365 (1954-11-01), Von Zelewsky
patent: 3413876 (1968-12-01), Shinn
patent: 3610640 (1971-10-01), Bollin et al.

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