Mark W Walter

US Patent:

7682082, Mar 23, 2010

Filed:

Jun 13, 2007

Appl. No.:

11/818017

Inventors:

Nathan R. Kane - Somerville MA, US
Joachim Sihler - Cheltenham, GB
Alexander H. Slocum - Concord NH, US
Mark Walter - Keene NH, US

Assignee:

AMETEK-Precitech, Inc. - Keene NH

International Classification:

F16C 32/06
F16C 29/00

US Classification:

384110, 384 12

Abstract:

A compact surface self-compensated hydrostatic bearing includes a rotor assembly including a rotor plate having upper and lower fluid restricting faces, a rotor top and bottom, each having bearing surfaces angled with respect to an axis of rotation of the rotor assembly; a stator assembly including a stator top and a stator bottom housing the rotor assembly therebetween, the stator top and bottom having bearing surfaces facing and spaced apart from the rotor top and bottom bearing surfaces forming upper and lower bearing gaps, respectively, therebetween; the stator top and bottom including a lower and an upper fluid restricting surface, respectively, facing and spaced apart from the rotor upper and rotor lower fluid restricting faces, respectively, forming upper and lower restricting gaps, respectively, therebetween; and a fluid supply system configured to supply pressurized fluid to the bearing gaps and into the upper and lower fluid restricting gaps.

US Patent:

57743223, Jun 30, 1998

Filed:

Jul 13, 1995

Appl. No.:

8/501847

Inventors:

Mark Richard Walter - Bridgeport CT
David Philip Eckel - Wetherfield CT
Thomas James Batko - Wallingford CT

Assignee:

Hubbell Incorporated - Orange CT

International Classification:

H01H 4722

US Classification:

361170

Abstract:

A power supply circuit is provided for use in combination with a load and an alternating current (AC) power source for selectively connecting and disconnecting the load and the AC power source. The load is connected between a neutral conductor of the AC power source and the power supply circuit. The power supply circuit is connected to a power or hot line conductor and a ground conductor of the AC power source. The power supply circuit comprises relay connected in series between the load and the line conductor; a control circuit for selectively operating the relay; and a transformer. The primary winding of the transformer is connected in series with the line conductor and the ground conductor for supplying power to the control circuit even when the load is disconnected from the AC power source. The power supply circuit comprises a switch in series with the primary winding of the potential transformer for interrupting the primary winding current at frequencies above the AC line frequency. The power supply circuit can also comprise a slide or air gap switch to isolate the power supply circuit from the AC power source when the air gap switch is in the OFF position or to limit current to an acceptable level.

US Patent:

57269009, Mar 10, 1998

Filed:

Nov 8, 1995

Appl. No.:

8/554377

Inventors:

Mark Richard Walter - Bridgeport CT
David Philip Eckel - Wetherfield CT
Thomas James Batko - Wallingford CT

Assignee:

Hubbell Incorporated - Orange CT

International Classification:

H02H 316

US Classification:

364483

Abstract:

A three wire power supply circuit is provided comprising a circuit for monitoring the integrity of the ground connection of the power supply circuit. A circuit element is provided in the line-to-ground current path which conducts when current flows in the line-to-ground current path and is nonconductive when the ground connection is poor or absent. A microcontroller monitors the output of the circuit element and operates a buzzer or a light emitting diode to indicate when the ground connection is poor or absent.