METHOD FOR WORKING RADIALLY ENLARGED FAUCET OF TUBE WITH INNER AND OUTER SMOOTH WAVES

Title:

METHOD FOR WORKING RADIALLY ENLARGED FAUCET OF TUBE WITH INNER AND OUTER SMOOTH WAVES

Document Type and Number:

Japanese Patent JP3771490

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To prevent a flat rigidity of a rubber ring faucet from decreasing by not collapsing a rib, to surely connect a spigot of a tube to the faucet by reducing unevenness of an inner diameter of the faucet, and to surely hold watertightness of the faucet by the rubber ring by mounting the ring at the faucet having a smooth inner surface.
SOLUTION: A method for working a radially enlarged faucet of a tube with inner and outer smooth waves comprises the step of removing an outer layer 26 formed on an end 12d of the tube 50 with the inner and outer smooth waves. The method further comprises the steps of heating the end 12d of the tube in which the layer 26 is removed to a temperature of softening point lower than a melting point. The method also comprises the step of forming the rubber ring faucet 14 by radially enlarging the end 12d of the tube. Thus, since the end 12d of the tube is radially enlarged in a state in which the layer 26 is removed, a rib 18 is not collapsed by the layer 26. Since the rib 18 is not collapsed, an inner peripheral surface 14a of the faucet 14 can be formed smooth. Accordingly, the unevenness of the inner diameter of the faucet 14 is reduced.

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Inventors:

Kenzo Nishitani
Keiji Murakami
Akeboshi Yoshishige

Application Number:

JP2001391681A

Publication Date:

April 26, 2006

Filing Date:

December 25, 2001

Export Citation:

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Assignee:

Kubota Sea Eye Co., Ltd.
Daika Polymer Co., Ltd.

International Classes:

B29C57/04; F16L21/00; F16L11/11; F16L33/00; F16L33/28; B29L23/18; (IPC1-7): B29C57/04; F16L21/00

Domestic Patent References:

JP61148036A
JP2000148036A
JP6185681A
JP5660213A

Attorney, Agent or Firm:

Yoshito Yamada

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