METHOD FOR PRODUCING RESIN JOINT BOOT

WIPO Patent Application WO/2006/054338

A1

A method for producing a resin joint boot capable of being fixed to an outer case having noncircular outer circumferential profile, comprising a step for injection molding a parison (40) consisting of a first portion (42) having a plurality of protrusions (24) at the inner circumferential part and corresponding to a large diameter side fixing section (14), a second portion (44) corresponding to a small diameter side fixing section (12), and a third portion (46) for coupling them using an injection molding die (50), and a step for blow molding a bellows section (16) by covering the outer circumference of the third portion with a blow molding die (85). The injection molding die (50) is provided with a core (55) for forming a material removing hole (25) in the outer surface of the protrusion (24) such that the core can be advanced to a cavity (56) for forming the protrusion or retracted therefrom. The parison is injection molded while the core is kept projecting into the cavity and the core is retracted from the cavity at the time of mold releasing.

OHSHITA TAKENORI (JP)
SAITO KATSUSHI (JP)
IMAZU EIICHI (JP)

PCT/JP2004/017088

May 26, 2006

November 17, 2004

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TOYO TIRE & RUBBER CO (JP)
OHSHITA TAKENORI (JP)
SAITO KATSUSHI (JP)
IMAZU EIICHI (JP)

B29C49/06; B29C45/44; B29C49/64; F16D3/84; F16J3/04; F16J15/52; B29L31/26

JPH10325464A	1998-12-08
EP0915264A2	1999-05-12
JP2003222155A	2003-08-08
JPH01250673A	1989-10-05
JPS6425110U	1989-02-10

Tsutada, Akiko (Nissei Bingomachi Bldg. 7-10, Bingomachi 1-chome, Chuo-k, Osaka-shi Osaka 51, JP)

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