Power tongs and control system

Details Power tongs and control system Power tongs and control system

1989-06-14

1991-01-29

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

173 12, B25B 2315

Patent

active

RE0335266

ABSTRACT:
A control system for power tongs comprises two tongs torque limiters, one of which limits tongs torque to a very low (hand-tight) level; the other limits torque at full makeup to, for example, 2000 ft. lb. The hand-tight torque limiter is manually or automatically disabled after the hand-tight level is reached. The system enables the operator to verify that the threads are properly engaged before applying full torque to the connection. The tongs have a very high reduction ratio, so that torque rises very slowly and can be more accurately controlled.

REFERENCES:
patent: 1864844 (1932-06-01), Meunier
patent: 2978936 (1961-04-01), Orner
patent: 3299725 (1967-01-01), Gewirc et al.
patent: 3319494 (1967-05-01), Ulbing
patent: 3586115 (1971-06-01), Amtaberg
patent: 3610343 (1971-10-01), Bratt
patent: 3719236 (1973-03-01), Smith, Jr. et al.
patent: 3719237 (1973-03-01), Flick
patent: 3722331 (1973-03-01), Radulescu
patent: 4037672 (1977-07-01), Hodge
patent: 4125040 (1978-11-01), True
patent: 4266444 (1981-05-01), Anderson et al.
patent: 4305472 (1981-12-01), Brossette
patent: 4484871 (1984-11-01), Adman et al.

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