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US 2017/0342776 A1Published application
Retractable Auger Head
AssigneeRadius HDD Direct, LLC
InventorsDavid Bullock, Ronald F. Wright, Toby Wright, Thomas Miller, Boston Bullock
Life of this patent
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Abstract
A retractable auger boring cutter head. The cutter head has fixed cutters and at least one pivoting cutter. The pivoting cutter is biased to a position that extends beyond a diameter of a casing being installed. When pulled back through the casing, a surface of the pivoting cutter contacts the casing, reducing the effective diameter of the cutter head and allowing it to be removed.
Claims19
A cutting assembly comprising;
- a base plate;
- a plurality of first bits fixed in position relative to the base plate;
- a second bit pivotally attached to a first side of the base plate and movable between a first and second position;
- wherein an effective diameter of the cutting assembly is larger when the second bit is in the first position;
- and
- a biaser disposed entirely on a second side of the base plate to urge the second bit into the first position.
3 more elements
A cutting assembly having a longitudinal axis, comprising:
- a base plate having a center through which the axis extends, and concentric inner and outer zones arranged around the center;
- a plurality of static cutting elements supported by the base plate and having no axial footprint within the outer zone;
- at least one mobile cutting element supported by the base plate and movable between a first position, in which its axial footprint is at least partially situated within the outer zone, and a second position, in which it has no axial footprint within the outer zone;
- and
- a guide plate disposed adjacent to the at least one mobile cutting element to transfer torque from the at least one mobile cutting element to the base plate.
2 more elements
Dependencies are inferred from the claim text.