Patent GB-948573-A (GB)
Title: Improvements in or relating to ice cream freezer installations
Inventor: CAMPBELL THOMAS ALEXANDER
IPC: F25C1/00
Filed: 1962-10-24
Abstract: 948,573. Ice-cream freezers. ICE CREAM EQUIPMENTS Ltd. Oct. 24, 1962, No. 40304/62. Heading F4H. In an ice cream freezer installation comprising an internal-combustion engine, a refrigeration unit for a soft ice cream compartment, a beater in said compartment and clutch means for completing a drive path between the engine and the beater, the beater is controlled electrically so that the clutch means and the refrigeration unit are periodically energized and are de-energized when the viscosity of the ice cream exceeds a predetermined value. As shown, the beater is driven through an electromagnetic clutch C1 and the compressor of the refrigeration system is driven through a clutch C2, refrigerant from said compressor being supplied to the refrigerating unit of an ice cream compartment through a solenoid valve SV1 and to the refrigeration unit of a deep freeze storage compartment through a solenoid valve SV2. In operation, the internal-combustion engine is started and a switch ETS closes when the engine temperature reaches a desired value; the contacts SW2/1 to 3 of a main switch are then closed. This energizes a relay coil R3 through a closed contact R2/2 and a switch DFS so that contacts R3/1 and R3/2 close and energize the clutch C2 and valve SV2 respectively. A motor M1 which is energized by the closure of switch SW2 drives a cam C through gearing G1, which cam closes a switch SW1 which energizes the valve SV1 and a relay coil R1 through contact SW2/2 and a switch PS. Contact R1/1 then closes to keep the coil R1 and valve SV1 energized when the switch SW1 is opened after a short interval by the cam C, and contacts R1/2 and R1/3 close to energize the beater clutch C1 and relay coil R2 respectively. Contact R2/1 then closes to maintain the compressor clutch C2 energized and contact R2/2 opens to de-energize relay coil R3. Contact R3/2 opens to de-energize valve SV2 and so cut off the supply of refrigerant to the deep freeze unit. Operation of the ice cream refrigeration unit and of the beater continues until the viscosity of the ice cream reaches a predetermined value and a torque sensitive switch TS opens. This de-energizes coil R1 and valve SV1, contact R1/3 opens to deenergize coil R2, contact R2/2 closes to energize coil R3 and consequently contact R2/1 opens to de-energize the beater clutch C2 and contact R3/2 closes to energize valve SV2. Thus the soft ice cream refrigeration unit and beater are switched off and the deep freeze unit is switched on. Should the deep freeze unit reach a sufficiently low temperature, the switch DFS will open to de-energize coil R3 and compressor clutch C2 unless coil R2 is energized and contact R2 is energized and contact R2/1 closed. When ice cream is dispensed from the ice cream compartment micro-switches MS/1 and MS/2 are closed to energize the beater clutch C1 and a second motor M2 respectively. The motor M2 drives the cam C through gearing G2 to hasten the closing of switch SW1. A switch SW3 is provided to assist in cleaning the soft ice cream compartment when the switch SW2 is open, the contacts SW3/1 and SW3/2 being closed to energize the beater clutch C1 during such cleaning.