Pumps – Successive stages – Reciprocating rigid stages
Patent
1975-12-31
1977-04-19
Freeh, William L.
Pumps
Successive stages
Reciprocating rigid stages
417503, 417265, 92129, F04B 300, F04B 2104
Patent
active
040185451
ABSTRACT:
A cylinder houses a slidable piston that is separated into two axially spaced portions. A rod interconnects the portions and permits lost motion between the portions when the piston is slid in either direction in the cylinder. By valving and conduits, the piston and cylinder draw quanta of air and liquid mix, for ice milk or the like, together in selected proportion, mix these together and forward them from the pump, e.g. to a freezing chamber. Means are provided, for instance the rod may be exchanged for one of another size, for varying said selected proportion. Preferably a sensor is provided to cause the pump to operate intermittently, e.g. to replenish mix which has been withdrawn from the freezing chamber. Also by preference the freezing chamber is maintained at 10-40 p.s.i.g. in order to tend to prevent reduction of overrun between the time when the air is mixed with the liquid mix and the time when the frozen confection is dispensed.
REFERENCES:
patent: 833457 (1906-10-01), Hammond
patent: 1364823 (1921-01-01), Aull
patent: 1653562 (1927-12-01), Grimley
patent: 1858036 (1932-05-01), Brown
patent: 2365234 (1944-12-01), Wineman
patent: 2458821 (1949-01-01), Anderson et al.
patent: 2912935 (1959-11-01), Wier et al.
patent: 3023710 (1962-03-01), Tyree, Jr.
patent: 3330211 (1967-07-01), Faro et al.
patent: 3829242 (1974-08-01), Duke et al.
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