ApplicationNo. 05/965607 filed on 12/01/1978
US Classes:62/70, By injecting137/594, Plural noncommunicating flow paths141/46, System fluid used in seal or in valve or lift operation222/146.6, Cooling only62/306, Means feeding gas into pressurized receiver62/342With means for working congealing material, e.g., beater
ExaminersPrimary: Wayner, William E.
Assistant: Tapolcai, William E.
Attorney, Agent or Firm
International ClassesA23G 9/04 (20060101)
A23G 9/28 (20060101)
A23G 9/20 (20060101)
F25C 1/12 (20060101)
F25C 1/14 (20060101)
AbstractA method and apparatus for preparing and dispensing a semi-frozen food product containing liquid and gaseous ingredients including a refrigerated freezing chamber and volumetric type gas and liquid pumps operable when driven to pump gas and liquid in preselected proportions and under pressure to the freezing chamber. The gas and liquid pumps are motor driven under the control of a pressure responsive control which starts the pumps when the pressure in the freezing chamber falls below a predetermined super-atmospheric pressure range and stops the pumps when it rises above that predetermined super-atmospheric pressure range. The gas and liquid are supplied to the respective pumps under a pressure that is above atmospheric pressure but below the predetermined super-atmospheric pressure range to be maintained in the freezing chamber, and hold-back valves are provided between the pumps and the freezing chamber to inhibit flow of liquid and gaseous ingredients to the freezing chamber until the pressure at the outlets of the pumps exceeds the pressure at the inlets of the pumps.