Buckles – buttons – clasps – etc. – Strap-end-attaching devices – Buckle connected
Patent
1979-12-07
1983-06-28
Frazier, Roy D.
Buckles, buttons, clasps, etc.
Strap-end-attaching devices
Buckle connected
24263DA, 24263R, A44B 2100
Patent
active
043897606
ABSTRACT:
A slip unit for releasably supporting a well pipe, including a support structure to be positioned on and turn with a rotary table and preferably taking the form of a slip bowl, and a vertically movable slip carrier structure suspending a number of pipe-gripping slips and adapted to be releasably retained by latch means in a lower active position, with the carrier and slips being yieldingly urged upwardly to inactive positions when the latch means are released. The support structure and carrier structure are both desirably formed of complementary sections hinged for relative swinging movement between closed positions about the pipe and open positions permitting movement of the unit laterally relative to the pipe, and with an additional latch being provided for retaining the structures in their closed positions. The carrier structure and slips are urged upwardly by spring cartridges which are removable as units from the slip assembly in a condition maintaining the actuating springs under compression and preventing injury or damage by release of the spring force during removal. Vertical guides are provided circularly between the slips for centering a well pipe in a manner preventing damage to the slips by engagement with enlargements on the pipe.
REFERENCES:
patent: 1725459 (1929-08-01), Krell et al.
patent: 1844378 (1932-02-01), Campbell
patent: 2231923 (1941-02-01), Koen
patent: 2589159 (1952-03-01), Stone
patent: 2623257 (1952-12-01), Moon
patent: 2698734 (1955-01-01), Tremolada
patent: 2814461 (1957-11-01), Martin
patent: 4203182 (1980-05-01), Boyadsieff
Aschenbrenner Peter A.
Frazier Roy D.
Green William P.
Varco International, Inc.
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