Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1997-02-19
2000-07-04
Scherbel, David A.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5718, 81 572, B25B 1700
Patent
active
060822244
ABSTRACT:
A new power tong for rotating tubular members for make-up (connection) and break-out (disconnection) operations. In one aspect such a tong has at least one movable jaw with a smooth surface gripping element thereon and pre-load apparatus for applying a pre-load force to a movable jaw so that the jaw does not slip on a tubular to be rotated and so it does not mark or damage the tubular. In one aspect the pre-load apparatus includes a first pre-load device at one end of a movable jaw for breakout operations and a second pre-load device at another end of the jaw for make-up operations. In one aspect a power tong which has unique smooth surfaced jaw inserts made, e.g., of aluminum. In one aspect a single pivotable pre-load cylinder, fixed to rotary, pivots for pivotable connection to one jaw or the other. This can be done manually or a powered smaller piston/cylinder may be used to pivot the pre-load cylinder. In one aspect a jaw unit which comprises a jaw holder and a jaw movable with respect to said jaw holder, characterized in that said jaw is slidably mounted on said jaw holder.
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Albright Steven
Carlsson Andreas
Cummings Patrick
Hayes Michael
McDaniels Gary
Danganan Joni B.
McClung Guy
Scherbel David A.
Weatherford / Lamb, Inc.
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