Expansion wedge for use with heat exchanger tube, and...

Metal deforming – Process – Tube making or reshaping

Reexamination Certificate

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Details

C072S370060, C072S358000, C072S316000

Reexamination Certificate

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06843097

ABSTRACT:
An expansion section for expanding the distance between longitudinal side surfaces of an opening of a tube when being inserted a predetermined depth into the opening is formed an expansion wedge body, and guide protuberances are protrusively formed on the respective longitudinal sides of the expansion section. The guide protuberances are inserted into the spaces provided on the respective sides of the opening of the tube, thereby guiding the expansion section into the opening.

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