Automatic temperature and humidity regulation – Mixing fluid of dissimilar temperature – Mixing valve with temperature motive means
Patent
1988-06-08
1989-08-08
Wayner, William E.
Automatic temperature and humidity regulation
Mixing fluid of dissimilar temperature
Mixing valve with temperature motive means
364502, G05D 23185
Patent
active
048544981
ABSTRACT:
A shower temperature control system includes a single mixing valve connected between hot and cold sources of water and a shower head, a gear motor with a shaft connected to the mixing valve, a water temperature sensor positioned in the shower plumbing, a numeric keypad for numeric entry of desired shower water temperature, a potentiometer for alternate entry of desired shower temperature, and a controller which derives a motor drive signal from a difference between the sensed temperature and the set temperature. Initially, and when no temperature has been set, the controller maintains a safe default water temperature, such as 98.degree. F. The controller incorporates memory for the storage of a plurality of preset shower water temperatures which may be selected by selection keys on the keypad.
REFERENCES:
patent: 1820145 (1931-08-01), Liaset
patent: 1996330 (1935-04-01), Goshaw
patent: 2430133 (1947-11-01), Muffly
patent: 2533624 (1950-12-01), Ray
patent: 4311271 (1982-01-01), Nagui
patent: 4420811 (1983-12-01), Tarnay et al.
patent: 4421269 (1983-12-01), Ts'as
patent: 4611757 (1986-09-01), Saether
patent: 4739923 (1988-04-01), Tsutsui et al.
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