Self centering tongs and transfer arm for drilling apparatus

Details Self centering tongs and transfer arm for drilling apparatus Self centering tongs and transfer arm for drilling apparatus

1981-06-01

1983-09-13

Novosad, Stephen J.

Boring or penetrating the earth

With orienting or racking means for unconnected tools or...

175 52, 81 5716, F21B 1900

Patent

active

044036663

ABSTRACT:
A drill rig having a drill rig mast and a transfer arm is described. The clamps of the transfer arm are resiliently mounted to the transfer arm so as to provide limited axial movement of the clamps and thereby of a clamped down hole tubular. This resilient support for the down hole tubular serves to reduce damage to the threaded ends of the tubular during tubular handling operations. In addition, the clamps of the transfer arm are provided with resilient clamping surfaces which serve to engage the clamped tubular frictionally, without gouging or deeply scratching the surface thereof. A pair of automatic, self-centering, hydraulic tongs is provided for making up and breaking out threaded connections of tubulars having various diameters without manual adjustment of the tongs.

REFERENCES:
patent: Re26284 (1967-10-01), O'Neill et al.
patent: 3336991 (1967-08-01), Klem et al.
patent: 3799009 (1974-03-01), Guier
patent: 4303270 (1981-12-01), Adair

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