F - Mech Eng,Light,Heat,Weapons – 25 – C
Patent
F - Mech Eng,Light,Heat,Weapons
25
C
62/18
F25C 1/00 (2006.01) F25C 1/12 (2006.01)
Patent
CA 1328041
ABSTRACT OF THE DISCLOSURE An ice cube maker has a generally upright gridded evaporator, a hot gas defrost for harvest of cubes, a storage bin below the evaporator, a hinged cube and water curtain between the evaporator and the bin, a new and improved control for the freeze cycle, and a new and improved control for the harvest cycle. The freeze cycle control has a temperature sensor, on a backside of the evaporator, circuitry to count down a predetermined time after a predetermined plate temperature has been sensed, the circuit terminates the countdown if the plate temperature exceeds the predetermined temperature and restarts the countdown when the predetermined temperature is again reached, and the circuit switches the refrigeration from freeze to hot gas defrost when the countdown is completed for harvest of the ice cubes; the harvest control has an ice curtain sensor connected to the refrigeration control, and a lever between the ice curtain and the sensor, when the curtain is opened by ice cubes the sensor picks up the lever movement and the control switches the refrigeration from the defrost to the freeze cycle. Methods of making ice cubes have the steps of freezing cubes, sensing the ice thickness as a function of the temperature of the evaporator plate, counting down after a predetermined temperature is reached, terminating countdown if the temperature increases and restarting countdown at the next sensing of the predetermined temperature, and switching into defrost upon completion of the countdown; when the ice drops off the evaporator it opens the ice curtain and the opening of the curtain is sensed to give a signal to switch the refrigeration from defrost to the subsequent freeze cycle.
553611
Josten Marvin H.
Merrill Terry L.
Schneider Kenneth W.
Utter Robert P.
Ridout & Maybee Llp
Schneider Metal Manufacturing Co.
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