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US 2022/0168832 A1Published application
Thread-cutting die head for powered pipe threader
AssigneeMilwaukee Electric Tool Corporation
InventorMatthew R. Wolf
Life of this patent
Estimating the term…
Abstract
A thread-cutting die head includes a die carrier, defining a central axis, for supporting a plurality of thread-cutting dies, a cam plate coaxial with the die carrier including a plurality of cam members for engaging with the plurality of thread-cutting dies, and a locking system including a positioning screw extending through an arcuate slot in the cam plate, a bushing surrounding the positioning screw, and a handle threadably coupled to the positioning screw configured to impart a force against the bushing to press the flange portion of the bushing against the first surface of the cam plate, thereby developing a frictional force between the bushing and the cam plate to lock the rotational position of the cam plate relative to the die carrier.
Claims26
A thread-cutting die head for a powered pipe threading machine, the thread- cutting die head comprising:
- a die carrier, defining a central axis, for supporting a plurality of thread-cutting dies for displacement relative to the central axis in a radially inward direction and radially outward direction;
- a cam plate coaxial with the die carrier including a plurality of cam members for engaging with the plurality of thread-cutting dies and displacing the cutting dies in the radially inward direction and radially outward direction in response to relative rotation between the cam plate and the die carrier;
- and
- a locking system including
- a positioning screw extending through an arcuate slot in the cam plate, the arcuate slot extending between a first face and a second face of the cam plate, the first face of the cam plate having a first surface roughness,
- a bushing surrounding the positioning screw having a flange portion with a second surface roughness less than the first surface roughness engaged with the first face of the cam plate, and
- a handle threadably coupled to the positioning screw configured to impart a force against the bushing to press the flange portion of the bushing against the first surface of the cam plate, thereby developing a frictional force between the bushing and the cam plate to lock the rotational position of the cam plate relative to the die carrier.
4 more elements
A thread-cutting die head for a powered pipe threading machine, the thread-cutting die head comprising:
- a die carrier, defining a central axis, for supporting a plurality of thread-cutting dies for displacement relative to the central axis in a radially inward direction and radially outward direction;
- a cam plate coaxial with the die carrier including a plurality of cam members for engaging with the plurality of thread-cutting dies and displacing the cutting dies in the radially inward direction and radially outward direction in response to relative rotation between the cam plate and the die carrier;
- and
- a locking system including
- a positioning screw extending through an arcuate slot in the cam plate,
- a cam washer surrounding the positioning screw,
- a pin threaded to the positioning screw, and
- a cam handle including
- a cylindrical cam portion engaged with the cam washer and defining a rotational axis of the handle, and
- an aperture in which the pin is slidably received, the aperture defining a longitudinal axis that is offset from the rotational axis of the handle,
- wherein rotation of the cam handle in a first direction about the rotational axis is configured to impart a clamping force against the cam washer to lock the rotational position of the cam plate relative to the die carrier.
8 more elements
A thread-cutting die head for a powered pipe threading machine, the thread-cutting die head comprising:
- a die carrier, defining a central axis, for supporting a plurality of thread-cutting dies for displacement relative to the central axis in a radially inward direction and radially outward direction;
- a cam plate coaxial with the die carrier including a plurality of cam members for engaging with the plurality of thread-cutting dies and displacing the cutting dies in the radially inward direction and radially outward direction in response to relative rotation between the cam plate and the die carrier;
- and
- a locking system including
- a bushing,
- a die-locking arm pivotably supported upon the bushing,
- a positioning screw extending through an arcuate slot in the cam plate and the die-locking arm, wherein bushing surrounds and is threaded to the positioning screw,
- a coupler coupled for co-rotation with the bushing and being engaged with the die-locking arm when the coupler is located in a first position relative to the positioning screw, and
- a spring for biasing the coupler away from the first position and toward a second position in which the coupler is disengaged from the die-locking arm,
- wherein, with the coupler in the first position, rotation of the die-locking arm in a first direction is configured to rotate the bushing relative to the positioning screw in a tightening direction, thereby imparting a clamping force between the bushing and the cam plate to develop a frictional force for locking the rotational position of the cam plate relative to the die carrier.
7 more elements
A thread-cutting die head for a powered pipe threading machine, the thread-cutting die head comprising:
- a die carrier, defining a central axis, for supporting a plurality of thread-cutting dies for displacement relative to the central axis in a radially inward direction and radially outward direction;
- a cam plate coaxial with the die carrier including a plurality of cam members for engaging with the plurality of thread-cutting dies and displacing the cutting dies in the radially inward direction and radially outward direction in response to relative rotation between the cam plate and the die carrier;
- and
- a locking system including
- a positioning screw extending through an arcuate slot in the cam plate,
- a bushing surrounding the positioning screw having a flange portion engaged with the first face of the cam plate,
- a handle threadably coupled to the positioning screw configured to impart a force against the bushing to press the flange portion of the bushing against the first surface of the cam plate, thereby developing a frictional force between the bushing and the cam plate to lock the rotational position of the cam plate relative to the die carrier,
- a rack coupled to the cam plate,
- a pinion rotatably supported by a head of the positioning screw and meshed with the rack, and
- an actuator coupled for co-rotation with the pinion,
- wherein, in response to rotation of the actuator and the pinion, the die carrier is rotated relative to the cam plate to adjust a radial position of the thread-cutting dies.
8 more elements
Dependencies are inferred from the claim text.