Power operated pipe slips and pipe guide
OwnerJohn F. Wardinventor
Life of this patent
Estimating the term…
Abstract
A pipe or casing spider coaxially overies a base ring and is provided with a plurality of slips supported by a slip ring above the spider. The slip ring and slips are moved vertically by a plurality of pressure cylinders interposed between the base ring and slip ring. A support plate coaxially underlies the base ring and is provided with a radial latch tongue slidable toward and away from the axis of the spider for maintaining a tubular string coaxially aligned with the spider.
Claims4
In combination with power operated pipe supporting apparatus coaxially surrounding pipe in a borehole and including a spider having a central downwardly converging slip seat coaxially overlying a base ring and having a plurality of slips pivotally supported by an overlying slip ring and moved vertically into and out of the slip seat in pipe gripping and released relation by a plurality of pressure operated cylinders extending between the base ring and slip ring, the improvement comprising:
- a control valve mounted on said spider and operatively connected with said pressure cylinders;
- a lever pivotally mounted at one end on said spider for vertical pivoting movement of its other end portion, said lever being operatively connected intermediate its ends with said valve;
- a laterally projecting shaft connected with the pivotally connected end of said lever;
- a handle engageable with said shaft for moving said lever other end portion vertically;
- and,
- pipe guiding plate means having a bore coaxially underlying said base ring for maintaining said pipe coaxial with said spider.
In combination with power operated pipe supporting apparatus coaxially surrounding pipe in a borehole and including a spider having a central downwardly converging slip seat coaxially overlying a base ring and having a plurality of slips pivotally supported by an overlying slip ring and moved vertically into and out of the slip seat in pipe gripping and released relation by a plurality of pressure operated cylinders extending between the base ring and slip ring, the improvement comprising:
- a plate having a bore coaxially underlying said spider, said plate having an upwardly open radial groove extending inwardly from its periphery and communicating in surrounding relation with the plate bore;
- a plate-like tongue longitudinally slidable within the groove and having a bifurcated inner end portion defining a partcircular inner end surface formed on a smaller radius than the radius of the plate bore;
- and,
- an arcuate tongue link pivotally connected at one end with one tongue bifurcation and cooperatively contacting at its other end portion the other tongue bifurcation,
- said link having an inner surface formed on a radius complemental with the radius of said partcircular surface and having an outer surface complemental with the surface of the groove surrounding the plate bore.
Dependencies are inferred from the claim text.