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US RE37,450 E1Granted
Directional multi-blade boring head
AssigneeThe Charles Machine Works, Inc.
InventorsArthur D. Deken, Cody L. Sewell
Life of this patent
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Abstract
Directional boring bits (1100, 1200) are disclosed which have at least one roller cone (1202, 1104) and also each define a deflecting surface (1104) for deflecting the boring bit when the bit is advanced without rotation. The borehole can be curved by pushing the bit forward without rotation.
Claims7
A directional boring head for a boring machine, the boring machine capable of axially advancing and rotating a drill string about an axis of rotation underground, the drill string ending in the directional boring head, said directional boring head comprising:
- a body having a central axis of rotation;
- a deflection structure mounted on the body defining a deflecting surface at an oblique angle to the central axis of rotation of the body;
- at least one a single roller cone mounted to said body;
- and
- the deflecting surface deflecting the boring head as the boring machine advances the drill string without rotation and the directional boring head drilling a relatively straight borehole as the boring machine advances the drill string with rotation.
2 more elements
Dependencies are inferred from the claim text.