Robert S Wilks

US Patent:

50276352, Jul 2, 1991

Filed:

Sep 4, 1990

Appl. No.:

7/576760

Inventors:

Robert S. Wilks - Loveland OH

Assignee:

General Electric Company - San Jose CA

International Classification:

B21D 3920

US Classification:

723427

Abstract:

Apparatus for thermal sizing elongated, tubular channels of a square cross section includes a die having plural elongated die elements and an elongated mandrel having a frame mounting plural pairs of rollers distributed along its length on all four sides. The die is inserted in the channel with its die elements disposed adjacent the channel corners. The mandrel is then inserted with its roller pairs peripherally engaging the die elements, pressing them against the channel corners. The channel, die and mandrel are then heated to a hot-forming temperature, thermally expanding the mandrel frame into pressing engagement with the die elements in lieu of the rollers to plastically reform the channel to a stable shape free of geometric irregularities.

US Patent:

55564488, Sep 17, 1996

Filed:

Jan 10, 1995

Appl. No.:

8/370865

Inventors:

William A. Cheney - Cincinnati OH
John T. Grady - Cincinnati OH
Victor L. Sellers - Park Hills KY
Kevin Lefler - New Richmond OH
Robert S. Wilks - Loveland OH

Assignee:

United Air Specialists, Inc. - Cincinnati OH

International Classification:

B03C 368

US Classification:

95 6

Abstract:

An improved electrostatic precipitator system is provided for use in high-grease atmospheres in which the grease is electrically conductive. The precipitator includes high-voltage insulators that are both located in areas unlikely to accumulate electrically-conductive grease and that, in themselves, can operate in a high-voltage system without tracking, even when a certain amount of conductive grease has accumulated on the insulators' surfaces. In a multi-cell precipitator system, a high-voltage insulator is provided as part of a cell-to-cell assembly that receives high-voltage electricity on one side of its insulator, and conducts that electricity to its opposite side, and is placed in a specially-shaped cut-out in the bulkhead between the cell chambers, in which the cut-out is shaped so as to minimize the amount of grease that may accumulate upon the cell-to-cell assembly's insulators. The electrostatic precipitator also includes a high-voltage electrical power supply that has special current limiting features and time delay functions that allow it to operate during relatively brief time intervals when a high-humidity atmosphere exists along with the electrically-conductive grease particulate. The electrostatic precipitator also includes electrical door interlocks using safety limit switches to detect whether or not any of the doors have been opened and which shut down the high voltage power of the system in the event of an untimely opening of one of the doors.