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US 10,519,719 B2Granted
Retractable auger head
AssigneeRadius HDD Direct, LLC
InventorsDavid Bullock, Ronald F. Wright, Toby Wright, Thomas Miller, Boston Bullock
Life of this patent
Estimating the term…
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;
- 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;
- and
- at least one biasing element configured to urge a corresponding mobile cutting element towards its first position, in which the biasing element is disposed on an opposite side of the base plate from the static cutting elements and the at least one mobile cutting element.
3 more elements
Dependencies are inferred from the claim text.