Apparatus for congealing liquids having a moving scraper

Claim 1

IN A MACHINE OF THE TYPE DESCRIBED, THE COMBINATION OF A HOUSING, AN EVAPORATOR IN THE HOUSING, SAID EVAPORATOR HAVING A FREEZING SURFACE, MEANS FOR DIRECTING THE PRODUCT TO BE FROZEN TO SAID SURFACE OF THE EVAPORATOR, AND FOR DIRECTING REFRIGERANT INTO THE EVAPORATOR, A MOTOR-COMPRESSOR UNIT CONNECTED WITH THE EVAPORATOR, A FROZEN PRODUCT HARVESTER BAR, A MOTOR INDEPENDENT OF SAID MOTOR-COMPRESSOR UNIT HAVING A DRIVE SHAFT CONNECTED AT ONE END FOR ROTATING THE HARVESTER BAR OVER SAID FREEZING SURFACE OF THE EVAPORATOR TO REMOVE THE PRODUCT FROZEN THEREON, THE OPPOSITE END OF THE DRIVE SHAFT OF THE LAST MENTIONED MOTOR PROJECTING UPWARDLY AND SUPPORTING A FAN HAVING A CENTRAL HUB, THE HUB OF SAID FAN BEING JOURNALLED ON THE UPPER END OF SAID LAST MENTIONED DRIVE SHAFT, A ROTARY CAM DRIVING CONNECTION BETWEEN THE HUB OF THE FAN AND THE DRIVE SHAFT ARRANGED SUCH THAT THE HUB OF THE FAN IS DISPLACED AXIALLY OF THE SHAFT IN RESPONSE TO ROTATION OF THE DRIVE SHAFT AND SWITCH MEANS ACTUATED BY AXIAL DISPLACEMENT OF THE HUB OF SAID FAN FOR CONDITIONING THE CIRCUIT TO THE MOTOR-COMPRESSOR UNIT FOR OPERATION WHEREBY WHEN THE HARVESTER BAR DRIVING MOTOR STALLS, THE CIRCUIT TO THE MOTORCOMPRESSOR UNIT IS OPENED.