Portable power tool for milling tube ends
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United States of America Patent
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-
Apr 16, 1991
Issued Date -
N/A
app pub date -
Feb 21, 1990
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 compresseed 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. An air motor design is also disclosed that provides very high rotary speeds using standard air system pressure, very high horsepower, a low polar amount of inertia and low torque. Also disclosed is a thin-walled, lightweight motor containing a sleeve therein as well as a motor having a sequentially increased exhaust port opening.
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