Flush Mounted Spider Assembly
AssigneeDrawWorks LP
InventorsAlbert Augustus Mullins, Matthew J. Hickl
Life of this patent
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Abstract
A rotary table has a non-circular drive recess in the central opening which carries an assembly of mounting structures and slip carriers that when joined together fit in the non-circular drive recess. The plurality of slip carriers are distributed about the periphery of the drive recess are extended down into the central opening of the rotary table. A slip and die arrangement is situated on each slip carrier. Slip manipulation drive cylinders, are distributed about the assembly periphery and move a synchronizer plate that moves the slips vertically to grip or release pipe extending through the opening of the rotary table.
Claims16
A pipe gripping apparatus for placement in a rotary table opening, comprising:
- a base having a lower passage for the pipe to pass through, said base shaped to enter said opening;
- a plurality of spaced members extending from said base and terminating in upper ends with interconnecting members therebetween, adjacent said upper ends, to define a segmented ring structure with an outer periphery having the shape of said opening for direct torque resistance transmitted from the pipe when supported by movable slips that are supported by said spaced members.
Dependencies are inferred from the claim text.