Cutting by use of rotating axially moving tool – Means to drive tool – With specific tool structure
Patent
1990-02-21
1991-04-16
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Means to drive tool
With specific tool structure
408201, 408211, 408702, 418270, B23B 4504
Patent
active
050077783
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.
REFERENCES:
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patent: 4620823 (1986-11-01), Hillestad
patent: 4761104 (1988-08-01), Hillestad
patent: 4819526 (1989-04-01), Geise
Hillestad Mark W.
Hillestad Tollief O.
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