Water heater construction and method of making same

Details Water heater construction and method of making same Water heater construction and method of making same

1990-07-11

1990-12-25

Moy, Joseph Man-Fu

Receptacles

Receptacle having flexible, removable inner liner

Means for venting air trapped between the liner and its...

220459, B65D 2518

Patent

active

049796372

ABSTRACT:
A water heater construction including an inner tank for containing water surrounded in spaced apart relationship by an outer shell. A sleeve of insulation material, such as fiberglass mat is located in the annular space between the inner tank and outer sleeve and extends from proximate the bottom end of the water heater construction upwardly longitudinally thereof a distance less than the entire height of the water heater construction such that the top edge of the insulation sleeve is a distance below the top end of the water heater construction. The top edge of the insulation sleeve includes an annular cuff which is of a radial thickness greater than the radial thickness of the rest of the insulation sleeve such that the cuff is compressed between the interior wall surface of the outer shell and exterior wall surface of the inner tank. An expanded foam thermal insulation material fills the annular space above the cuff of the insulation mat. A method of making the water heater construction includes the steps of locating a sleeve of insulation material around the exterior wall surface of the inner tank extending from proximate the bottom end of the inner tank and extending upwardly longitudinally thereof a predetermined distance less than the full length of the inner tank, folding the top end of the insulation sleeve back over itself to form an annular cuff at the top end of the sleeve, and positioning the outer shell concentrically over the inner tank whereupon the annular cuff is compressed between the interior wall surface of the outer shell and exterior wall surface of the inner tank. The annular space above the annular cuff of the sleeve is then filled with an expandable foam insulation material which is allowed to foam in situ.

REFERENCES:
patent: 2951608 (1960-09-01), Morrison
patent: 3489311 (1970-01-01), Folkerts et al.
patent: 3773604 (1973-11-01), Desai et al.
patent: 3935957 (1976-02-01), Hasegawa
patent: 4168013 (1979-09-01), King et al.
patent: 4190305 (1980-02-01), Knight et al.
patent: 4191304 (1980-02-01), Schiedai
patent: 4323620 (1982-04-01), Iwabuchi et al.

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