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US 5,853,053 AGranted
Stabilization devices for drill motors
AssigneeNeyrfor-Weir Limited
InventorsDavid Andrew Gilchrist, Andrew McPherson Downie
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AssigneeNeyrfor-Weir Limited
InventorsDavid Andrew Gilchrist, Andrew McPherson Downie
Estimating the term…
The invention relates to stabilisation devices for down-hole drill motors and provides such a device comprising a tubular motor body portion (18) adapted for rotational movement on a selective basis to provide a steering capability, a motor shaft (16) passing through the body portion (18). A lower end portion of the shaft provides an end surface (20) for attachment of a tool (32) by a bit attachment means (28, 30) provided within a lower end of the shaft. The lower end of the shaft (16) has an external diameter less than the internal diameter of the motor body portion so as to be either completely or partially received within the body portion to enable the overhang distance between the operating faces of the bit and the stabiliser on the bearing housing to be as short as possible. Alternatively the end face (20) of the shaft may project slightly (.ltoreq.5 cm) from the end face (22) of the motor body portion (18).
In a drill motor assembly of the kind adapted for use in a bore, a stabilisation device comprising a tubular motor body portion adapted for rotational movement on a selective basis to provide a steering capability, a motor shaft passing through said tubular motor body portion, a tool bit attachment means being provided within a lower end portion of the motor shaft, wherein the lower end portion of the motor shaft has an external diameter less than an internal diameter of a lower end portion of the motor body portion so as to be received or at least substantially received therewithin.
Dependencies are inferred from the claim text.