Refrigeration – With indicator or tester – Condition sensing
Patent
1997-07-31
2000-09-19
Tapoical, William E.
Refrigeration
With indicator or tester
Condition sensing
73 493, F25B 4900
Patent
active
061194700
ABSTRACT:
A freezing tank for making ice cream includes an outer tank that has a first enclosing tank wall with a first open end, and an inner tank that is placed in the outer tank through the first open end and that has a second open end surrounded by the first open end. The inner tank has a second enclosing tank wall received in the first enclosing tank wall. The first and second enclosing tank walls confine a cooling chamber for receiving a freezing fluid therein. The second open end is jointed to the first open end in a fluid-tight relationship to prevent leakage of the freezing fluid. Pressurized fluid can enter into the cooling chamber via a first hole that is communicated with the cooling chamber and that allows for insertion of a pressurizing device. A pressure detecting device can be mounted to the first enclosing tank wall to detect a decreased pressure representative of existence of a leakage via a second hole formed in the first enclosing tank wall. Closure members are provided for closing sealingly and selectively the first and second holes.
REFERENCES:
patent: 3280586 (1966-10-01), Funakoshi
patent: 4442702 (1984-04-01), Sawada
patent: 4791814 (1988-12-01), Nee
patent: 5081864 (1992-01-01), Zaim
patent: 5184504 (1993-02-01), Spring
patent: 5375455 (1994-12-01), Maresca, Jr. et al.
patent: 5507176 (1996-04-01), Kammeraad et al.
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