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US 5,348,104 AGranted
Rotary drive assemblies
OwnerWalter F. Torfsinventor
Life of this patent
Estimating the term…
Abstract
A well assembly including a drive string, a frame, a spindle mounted on the frame and means for rotating the spindle, is constructed to allow the upper end of the string to pass through the spindle. A nut with a non-circular downward protuberance is tightly, threadably engaged with the upper end of the drive stung. The spindle has a non-circular upward protuberance, and a tail bar snugly receives both protuberances. The tail bar supports the weight of the string and transmits rotary torque from the spindle to the string.
Claims10
In a well assembly that includes
- a drive string having a threaded upper end,
- a stationary frame,
- a spindle rotatably mounted on the frame and having an axial bore through which the drive string extends,
- first means for rotating the spindle, and
- second means for suspending the drive string from the spindle,
- the improvement wherein said second means includes a nut member threadably engaged with said threaded upper end on the drive string, the nut member having a non-circular, downwardly projecting first protuberance, and the spindle having a non-circular, upwardly projecting second protuberance, and a tail bar in the form of a sleeve member having a non-circular second end for snugly receiving said second protuberance, the tail bar surrounding said drive string, whereby the non-circularity of the protuberance and the ends of the tail bar ensure that the string, the threaded member, the tail bar and the spindle all rotate together.
3 more elements
Dependencies are inferred from the claim text.