Boots – shoes – and leggings
Patent
1989-02-06
1991-09-17
Smith, Jerry
Boots, shoes, and leggings
364510, 236 1212, 13762412, G05D 2330
Patent
active
050500627
ABSTRACT:
A temperature controlled fluid system includes hot and cold fluid supply connections and hot and cold fluid valves for controlling the flow of the hot and cold fluids into the system. Each valve has a valve seat and a valve member which is moveable with respect to the valve seat. First and second stepper motors are connected to the valves in such a manner that actuation of the respective stepper motor moves the corresponding valve member in relationship to the associated valve seat. The system includes a mixer for promoting mixing of the hot and cold fluids into a fluid mixture which has a substantially uniform temperature throughout a given cross section of the mixed fluid flow. Also included in the inventive system is a device for generating an electrical signal corresponding to the actual temperature of the mixed fluid, and digital processing circuitry for computing an error value between the actual fluid temperature and a preselected value therefor and then applying a feedback control algorithm to the error value to generate a feedback control signal for the hot and cold fluid valves. A logic decoder is connected between the processing circuitry and the stepper motors to selectively power the motors in response to the feedback signal. The invention may further include an input device for selecting the desired temperature and flow rate of the mixed fluid, as well as device for displaying actual and selected system parameters.
REFERENCES:
patent: 3974434 (1976-08-01), Yablonski
patent: 4322031 (1982-03-01), Gehlert
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patent: 4629968 (1986-12-01), Butts et al.
patent: 4682728 (1987-07-01), Oudenhoven et al.
patent: 4696428 (1987-09-01), Shakalis
Gordon Paul
Jarvis Robert J.
Smith Jerry
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