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US 4,316,503 AGranted
Solderless heat exchanger
AssigneeNippondenso Co., Ltd.
InventorsShogo Kurachi, Masami Tamura, Akio Ueda
Life of this patent
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AssigneeNippondenso Co., Ltd.
InventorsShogo Kurachi, Masami Tamura, Akio Ueda
Estimating the term…
A solderless type heat exchanger having an upper and lower tanks, header plates closing the opposing opened ends of respective tanks, a plurality of tubes extending through the head plates to provide a communication between the upper and lower tanks, and a plurality of plate fins attached to the outside of the tubes, the tubes being joined to the header plates and plate fins solely by pressure contact therebetween provided through expansion of the tubes. The header plate is provided with a collared portion around each bore for receiving the corresponding tube and an annular groove is formed around the periphery of each collared portion. The annular groove provides a resiliency which ensures the rigid and stable joint between the tubes and the header plate achieved solely by the pressure contact through the expansion of the tube.
In a heat exchanger having a pair of opposing tanks, a metal header plate of uniform thickness fixed to the open end of each of said tanks, a plurality of metal tubes extending through said header plates and providing a communication between said tanks, and a plurality of metal plate fins disposed on the outer surface of said tubes, said tubes being joined to said fins and said header plates solely through expansion of said tubes,
Dependencies are inferred from the claim text.