Peter R Fitzpatrick

US Patent:

6810302, Oct 26, 2004

Filed:

Mar 31, 2003

Appl. No.:

10/404179

Inventors:

Paul Darcy, Jr. - Hamden CT
William C. Harris - Derby CT
Michael S. Torok - Cheshire CT
Tahany El-Wardany - Hartford CT
Peter Fitzpatrick - Chatham MA

Assignee:

Sikorsky Aircraft Corporation - Stratford CT

International Classification:

G06F 1900

US Classification:

700182, 703 2, 700280

Abstract:

A method of predicting the cutting speed for machining of titanium alloy comprising the steps of obtaining a first transfer function for a tool system, obtaining a second transfer function for a workpiece system, selecting from the first transfer function a first flexible mode, selecting from the second transfer function a second flexible mode, defining a natural frequency of the first flexible mode and the second flexible mode, calculating a tooth passing frequency using the defined natural frequency, accepting the calculated tooth passing frequency if the calculated tooth passing frequency differs from a second harmonic of a combined system formed of the tool system and the workpiece system and from at least one natural frequency corresponding to the tool system and the workpiece system, calculating a stable spindle speed, defining a cut depth using the calculated spindle speed.

US Patent:

20030223831, Dec 4, 2003

Filed:

Jun 3, 2002

Appl. No.:

10/161264

Inventors:

Daniel Viens - Mansfield Center CT, US
Peter Fitzpatrick - Chatham MA, US
Tahany El-Wardany - Dundas, CA
Stephen Varanay - Guilford CT, US

International Classification:

B23B051/02

US Classification:

408/060000

Abstract:

A tool design methodology is provided for high speed machining tools for titanium alloys. The methodology includes providing a predetermined cutting criteria such as cutting speed and cutting depth. The geometry of the tool and work piece is modeled and discretized into desired sections. Cutting parameter such as instantaneous chip load per section and three dimensional forces per section are calculated. The heat parameters are calculated such as the heat generated on the shear and friction surfaces and the heat transfer across the work piece and tool interface. The temperature at the tool and work piece interface is calculated and the coolant parameters are adjusted to reduce the temperature at the interface. Coolant parameters may include the coolant flow angle relative to the interface, coolant impingement pressure at the interface, and the coolant flow rate at the interface. The temperature at the tool and work piece interface is again calculated to determine the coolant parameters that reduce the temperature thereby extending tool life. A high speed cutting tool may be provided according to the present invention that includes a shaft having a fluid passageway with the shaft being adapted to be secured to a chuck. The passageway terminates in a threaded aperture. A threaded fitting such as a pipe fitting is removably received in the threaded aperture with a nozzle at the end opposite the threaded aperture. The nozzle is in fluid communication with the passageway. The nozzle directs cooling fluid at the insert and work piece interface at a desired rate, pressure, and angle. The nozzle may be adjusted relative to the tool body to change the angle of the coolant upon the tool insert.

US Patent:

42792940, Jul 21, 1981

Filed:

Dec 22, 1978

Appl. No.:

5/972599

Inventors:

Peter R. Fitzpatrick - Glastonbury CT
Russell G. Meyerand - Glastonbury CT
Kenneth E. Shotwell - Stafford Springs CT

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

F28D 1500

US Classification:

165 45

Abstract:

Method and apparatus for utilizing the earth as a heat source and heat sink for heating and cooling buildings are disclosed. Flexible material such as hollow plastic or metal foil bags which can be buried in deep, narrow trenches are draped over and clamped to heat transfer fluid conduits or conventional heat pipes vastly increasing the heat transfer surface area serving the conduits or heat pipes. The heat pipe bags contain a heat transfer fluid and can contain wicks which are in heat transfer communication with the heat transfer fluid conduits or other heat pipes. The plastic or metal of the heat pipe bag similarly encloses the wick forming a closed, sealed system which can also include the conduit or heat pipe. Such conduit-heat pipe bag combination can be used in combination with conventional heat pumps to both heat and cool buildings.

US Patent:

45905789, May 20, 1986

Filed:

Jul 11, 1983

Appl. No.:

6/512829

Inventors:

John J. Barto - Cheshire CT
Peter M. Walsh - So. Windsor CT
Peter R. Fitzpatrick - Glastonbury CT
Richard F. Dondero - So. Meriden CT
Kenneth P. Demers - W. Hartford CT
Stephen M. Gardner - Enfield CT

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

G06F 1546

US Classification:

364513

Abstract:

Machine operations are performed by a robot at a plurality of locations on a workpiece based on off-line data. The off-line data is corrected based on two levels of workpiece/robot alignment. First the robot determines the orientation of a fixture to which the workpiece is mounted by "touching-off" on known reference points (touchblocks) on the fixture. Coordinate data for the location of local features on the workpiece is corrected based on the first level of alignment and the positions of the local features are then sensed to provide a coordinate transformation for subsequent application to nominal machine operation location coordinates. The local features may be preassembly rivets and provide for individualized robot response on a workpiece-by-workpiece basis.

US Patent:

43399290, Jul 20, 1982

Filed:

Apr 10, 1981

Appl. No.:

6/252731

Inventors:

Peter R. Fitzpatrick - Glastonbury CT
Russell G. Meyerand - Glastonbury CT
Kenneth E. Shotwell - Stafford Springs CT

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

F25B 2702

US Classification:

62 79

Abstract:

Method and apparatus for utilizing the earth as a heat source and heat sink for heating and cooling buildings are disclosed. Flexible material such as hollow plastic or metal foil bags which can be buried in deep, narrow trenches are draped over and clamped to heat transfer fluid conduits or conventional heat pipes vastly increasing the heat transfer surface area serving the conduits or heat pipes. The heat pipe bags contain a heat transfer fluid and can contain wicks which are in heat transfer communication with the heat transfer fluid conduits or other heat pipes. The plastic or metal of the heat pipe bag similarly enclosed the wick forming a closed, sealed system which can also include the conduit or heat pipe. Such conduit-heat pipe bag combination can be used in combination with conventional heat pumps to both heat and cool buildings.