Patent GB-350660-A (GB)
Title: Process and apparatus for continuously producing ice cream and other plastic substances
IPC: A23G9/20
Filed: 1930-04-22
Abstract: 350,660. Ice-cream and like freezers. VOGT INSTANT FREEZERS, Inc., 1303, South Shelby Street, Louisville, Kentucky, U.S.A.-(Assignees of Vogt, C. W. ; 34, Hill Road, Louisville, Kentucky, U.S.A.) April 22, 1930, No. 12442. Convention date, May 13, 1929. [Class 29.] In apparatus for the continuous production of plastic substances, e.g. ice-cream, the pressure and corresponding temperature of the refrigerant circulating through the apparatus are regulated in accordance with the resistance to movement of the substance. The cream flows from a tank 58, Fig. 2, through a pipe 59 to the inlet 60 of a reciprocating pump 61 which discharges it, together with incorporated air or carbon dioxide, through a pipe 62 to the freezer 39. The freezer comprises cylinders 43, Fig. 15, having rotary stirrers 49 and arranged in a barrel 46 to which liquid refrigerant, e.g. ammonia, is supplied from a reservoir 32, Fig. 1, the cream passing in series through the cylinders to an outlet 57 with which is associated a whipping chamber. A byepass 113 connects the creamsupply pipe 62 with a regulator 114 having a piston coacting with a counterweighted pivoted lever 115 connected by links to the valve 123 in the refrigerant vapour inlet pipe of the compressor of a refrigerating machine. The position of the valve determines the pressure in the reservoir 32 and, through the pipes 35, 40, the pressure and corresponding temperature in the barrel 46. The rate of evaporation in the barrel may be regulated by an injector supplied with liquid refrigerant through a valved pipe 34. Upon the cream reaching a predetermined consistency a switch 108 energizes a solenoid 110 which closes the valve 41 and stops the evaporation of the refrigerant in the barrel 46. The pump includes a double piston 132, Fig. 12, reciprocated through eccentric gear from a shaft 71 driven through a variable speed gear comprising grooved pulleys 68, 70, Figs 6 and 7, connected by an adjustable friction wheel 72 mounted in a stirrup 73 carried by a spring-loaded rod 74. The right-hand end of the pump cylinder communicates through passages controlled by a rotatable valve 140, Fig. 9, actuated by a cam 142 on the shaft 71 either with the cream inlet 60 or the passage 138 communicating with the central space 139 of the pump, while the left-hand end communicates through a ball valve 154, Fig. 13, either with the atmosphere or a supply of carbon dioxide gas. When the piston moves to the right air is drawn into the left-hand end of the cylinder and cream is forced through the passage 138 from the right-hand end to the central space 139. During the return stroke cream is drawn into the righthand end of the cylinder and the air previously drawn into the left-hand end passes through the ball valve 156 into the central space where it becomes incorporated with the cream which is discharged through the pipe 62. Specification 174,147, [Class 29, Cooling &c.], is referred to. The Specification, as open to inspection under Sect. 91 (3) (a) comprises also arrangements of the stirrers 49 and their shafts for increasing the ratio between the cooling surface and the cream space of the cylinders 43. This subject-matter does not appear in the Specification as accepted.