Portable power tool for milling tube ends
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United States of America Patent
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-
Apr 10, 1990
Issued Date -
N/A
app pub date -
Apr 6, 1989
filing date -
Oct 7, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A portable gas operated rotary tool is provided for milling a surface on the end of a cylindrical workpiece. The tool has a motor powered by a pressurized gas, such as compressed air. The motor directly drives a rotary milling head which is axially aligned with the axis of rotation of the motor. The motor has a stator chamber which houses a rotor having radial slots. Vanes are journaled within said slots for radial movement within the slot and define progressively expanding cavities. The milling head has a central bore for mounting on an arbor of the motor. The milling head includes blades for milling a frustoconical surface on the workpiece and a non-locking pilot tube to align the tool with the longitudinal axis of the workpiece. A novel air motor design is also disclosed that provides very high rotary speeds using standard air system pressure, very high horsepower, a low polar moment of inertia and a low torque.
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