Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent
1982-09-29
1984-10-02
Meister, James M.
Tool driving or impacting
Means to drive tool about an axis
Means to hold and relatively rotate sections of tool shaft
173171, E21B 300
Patent
active
044742495
ABSTRACT:
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 movable with respect to the longitudinal axis of the cylinder. A rotary quill surrounds the kelly for supplying rotational force to the kelly. A packing assembly carried about the kelly within the hydraulic cylinder proximate and end thereof seals hydraulic fluid within the hydraulic cylinder. An improved retaining assembly connects the packing assembly to the rotary quill but allows limited 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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Stevens John W.
Zahradnik Anton F.
Felsman Robert A.
Gunter Jr. Charles D.
Hughes Tool Company
Knoble J. L.
Meister James M.
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