Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – Expansible or vaporizable fluid actuated
Patent
1989-10-02
1990-06-26
Broome, H.
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
Expansible or vaporizable fluid actuated
337311, 337320, H01H 3738
Patent
active
049375490
ABSTRACT:
A condition responsive switching apparatus with an alarm feature for use in refrigeration appliances, such as freezers or the like. The switching apparatus includes a contact operator which moves between first, second, and third positions in response to the pressure changes of a bellows. The bellows pressure increases and decreases in response to changes in temperature sensed at the appliance. The apparatus includes a first set of control contacts to provide energization of a compressor and a second set of alarm contacts to provide energization of an alarm circuit. The contact operator has a first dog which opens and closes the control set of contacts as the operator moves through a snap action increment of travel between the first and second positions. An alarm spring opposes the travel of a second dog of the contact operator beyond the second position with a preload force until the excess of the snap action energy of the operator is dissipated. The alarm spring, thereafter, opposes the contact operator with a spring gradient until the operator reaches the third position and closes the alarm contacts. The closure of the alarm contacts causes the energization of an alarm circuit which signals that the appliance temperature is in excess of the cycling temperature and that the failure of a system component is likely to have occurred.
REFERENCES:
patent: 2537431 (1951-01-01), Stickel
patent: 2741099 (1956-04-01), Beane
patent: 2762888 (1956-09-01), Jacobs
patent: 2968275 (1961-01-01), Spiro
patent: 3100383 (1963-08-01), Foster et al.
patent: 3105362 (1963-10-01), Gould
patent: 3304395 (1967-02-01), Slonneger
patent: 3454919 (1969-07-01), Kulick
patent: 3510860 (1970-05-01), Christman
patent: 3617665 (1971-11-01), Berson
patent: 3631685 (1972-01-01), Young
patent: 3648214 (1972-03-01), Slonneger
patent: 3668594 (1972-06-01), Kulick
patent: 3721880 (1973-03-01), Neill
patent: 3735069 (1973-05-01), Andresen
patent: 3924213 (1975-12-01), Semple
patent: 4003044 (1977-01-01), Richmond, Jr.
patent: 4118610 (1978-10-01), Purssell et al.
patent: 4121655 (1978-10-01), Hart
patent: 4163129 (1979-07-01), Rossi et al.
patent: 4169357 (1979-10-01), Kelley
patent: 4190764 (1980-02-01), Decker
patent: 4194102 (1980-03-01), Branson et al.
patent: 4214136 (1980-07-01), Rossi et al.
patent: 4237746 (1980-12-01), Rossi et al.
patent: 4278855 (1981-07-01), Rossi
patent: 4301661 (1981-11-01), Krewson, Jr.
patent: 4311190 (1982-01-01), Walley
patent: 4346564 (1982-08-01), Gemma et al.
patent: 4406322 (1983-09-01), Rossi et al.
patent: 4490708 (1984-12-01), Thompson et al.
patent: 4575706 (1986-03-01), Heidman, Jr.
patent: 4621502 (1986-11-01), Ibrahim et al.
patent: 4777350 (1988-10-01), Crockett et al.
"K" Series Temperature Control, Ranco Information Bulletin No. 1531010, 1981.
Fuller Kennett R.
Kelly Ronald W.
Broome H.
General Electric Company
Payne R. Thomas
LandOfFree
Condition responsive switching apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Condition responsive switching apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Condition responsive switching apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1127874