Hr Textron, Inc.

Oasis Corporation

Larry L Nichols

Louis M Busick

Robert C Heagey

Clyde E Cobb

Stephen W Wharton

Alvon C Elrod, Jr

John W Host

Donald C Muths

A filter monitor system is provided in a bottled water cooler for automatically tracking a filter service interval, and for indicating that filter cleaning or replacement is required for continued efficient cooler operation. In the preferred form, the water cooler includes a thermoelectric chiller module for chilling at least a portion of water contained within a cooler reservoir. An air filter is mounted on a filter frame which is removably positioned for filtering air drawn by a fan to circulate over a heat sink associated with the thermoelectric chiller module. The filter monitor system includes a reset switch engaged by the filter frame to initiate and track a predetermined filter service time interval, such as thirty days, and to energize a signal such as an indicator light at the conclusion of this service interval to indicate that the air filter should be removed for cleaning or replacement.

Thermoelectric water cooler with filter monitor system

An electrohydraulic servovalve including a tailoring circuit coupled to provide a predetermined input signal to the motor of the valve. The predetermined signal functions to control the flow of fluid from the valve to effect a desired result. The electrohydraulic servovalve includes a housing defining round flow ports with a spool valve for metering flow through the ports. The spool valve substantially overlaps the round flow ports. The tailoring circuit includes a plurality of amplifiers each of which has a different gain. A command signal is applied to the amplifier and the output from the amplifiers is summed to provide an input signal to the motor of the electrohydraulic servovalve.

Electrohydraulic servovalve with flow gain compensation

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Valencia, CA, United States of America

Larry L Nichols