Kelly seal

Details Kelly seal Kelly seal

E - Fixed Constructions

21

B

255/23

E21B 3/00 (2006.01) E21B 3/04 (2006.01) E21B 33/08 (2006.01)

Patent

CA 1185593

ABSTRACT OF THE DISCLOSURE An earth boring machine is shown with an improved kelly seal. The machine includes a hydraulic cylinder and a kelly rotatably carried within the cylinder and axially cylinder. A rotary quill surrounds the kelly for supplying rotational force within the hydraulic cylinder proximate and end thereof seals hydraulic fluid within the hydraulic cylinder. An improved retaining assembly connects the relative rotational movement of the packing assembly with respect to the rotary quill about the longitudinal axis of the kelly. The limited movement provided by the retainer assembly isolates the packing assembly from drive torque which is transferred from the rotary quill to the kelly, thereby reducing the tendency of the packing assembly to drive the kelly.

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