Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1994-03-30
1995-08-08
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
82128, 82172, 408 835, 408187, 407175, B23B 4112, B23B 3500
Patent
active
054393299
ABSTRACT:
Methods and apparatus for on-site machining are disclosed. The internal portions of devices such as turbine valves must be machined in place, but present certain areas, such as the valve seat, that cannot be readily accessed from an external surface. The present invention provides methods and apparatus whereby such surfaces can be machined using a fixture to which a milling head or other machine tool is attached. In a preferred embodiment, a mounting plate is provided that contains holes or other features that cooperate with the structure to which the plate attached, thereby providing a rigid base for the machining operation. The present inventions also preferably uses a tool bar that has a cutting head that retracts and swivels. In its initial position the cutting head is swiveled inside the tool bar and the assembly can be inserted into a structure. Once inside, a threaded push rod is turned and manipulated to cause the cutting head to swivel, and then it is locked in place. After machining is complete, the cutting head is unlocked, swiveled and retracted into its original position so that the tool bar can be removed.
REFERENCES:
patent: 2040273 (1936-05-01), Rottler
patent: 2959109 (1960-11-01), Buchan
patent: 4022106 (1977-05-01), Kile
patent: 4234275 (1980-11-01), Clement
patent: 4678379 (1987-07-01), Sunday
patent: 5030041 (1991-07-01), Marron
patent: 5030046 (1991-07-01), Ricci
Bishop Steven C.
Westinghouse Electric Corporation
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