Patent ID: 11931816
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 9:
10. 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 a 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 face 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,
wherein a shaft on which the pinion is formed is rotatably supported at one end by a pinion bushing and at an opposite end by the head of the positioning screw, and
wherein the pinion bushing is slidable within a second arcuate slot in the cam plate.