US 5,848,617 AGranted

Bellows and method for manufacturing the same

AssigneeNok Corporation

InventorJun Enomoto

Life of this patent

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Abstract

A tubular hollow molded body is formed with a resin having a bending resistance; the hollow molded body is inserted into a mold; a resin with less stress relaxation is injected into both ends of the hollow molded body through a connecting path to mold a bellows intermediate; the resin moved into the connecting path of the bellows intermediate is removed; and a cut is put in the hollow molded body to mold a bellows portion.

Claims10

Dependent claims

A resin bellows structure comprising:

a first resin portion formed in the shape of a bellows so as to be expansible,
said first resin portion having a first axial end and a second axial end,
a second resin portion integrally connected to said first axial end of said first resin portion, and
a third resin portion integrally connected to said second axial end of said first resin portion,
each of said first axial end and said second axial end of said first resin portion having an annular projection which protrudes in an axial direction and has an end connecting surface, an inner-peripheral connecting surface and an outer-peripheral connecting surface,
said second resin portion sandwiching said projection of said first end of said first resin portion in such a way that said projection of said first end of said first resin portion is covered by said second resin portion,
said third resin portion sandwiching said projection of said second end of said first resin portion in such a way that said projection of said second end of said first resin portion is covered by said third resin portion,
said second resin portion having a connecting surface which contacts said end connecting surface, said inner-peripheral connecting surface and said outer-peripheral connecting surface of said first end of said first resin portion,
said third resin portion having a connecting surface which contacts said end connecting surface, said inner-peripheral connecting surface and said outer-peripheral connecting surface of said second end of said first resin portion,
at least one of said inner-peripheral connecting surface and said outer-peripheral connecting surface of said projection of said first end of said first resin portion having an annular groove which contacts said connecting surface of said second resin portion, and
at least one of said inner-peripheral connecting surface and said outer-peripheral connecting surface of said projection of said second end of said first resin portion having an annular groove which contacts said connecting surface of said third resin portion.

8 more elements

Dependencies are inferred from the claim text.

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Abstract

A resin bellows structure comprising:

a first resin portion formed in the shape of a bellows so as to be expansible,
said first resin portion having a first axial end and a second axial end,
a second resin portion integrally connected to said first axial end of said first resin portion, and
a third resin portion integrally connected to said second axial end of said first resin portion,
each of said first axial end and said second axial end of said first resin portion having an annular projection which protrudes in an axial direction and has an end connecting surface, an inner-peripheral connecting surface and an outer-peripheral connecting surface,
said second resin portion sandwiching said projection of said first end of said first resin portion in such a way that said projection of said first end of said first resin portion is covered by said second resin portion,
said third resin portion sandwiching said projection of said second end of said first resin portion in such a way that said projection of said second end of said first resin portion is covered by said third resin portion,
said second resin portion having a connecting surface which contacts said end connecting surface, said inner-peripheral connecting surface and said outer-peripheral connecting surface of said first end of said first resin portion,
said third resin portion having a connecting surface which contacts said end connecting surface, said inner-peripheral connecting surface and said outer-peripheral connecting surface of said second end of said first resin portion,
at least one of said inner-peripheral connecting surface and said outer-peripheral connecting surface of said projection of said first end of said first resin portion having an annular groove which contacts said connecting surface of said second resin portion, and
at least one of said inner-peripheral connecting surface and said outer-peripheral connecting surface of said projection of said second end of said first resin portion having an annular groove which contacts said connecting surface of said third resin portion.

8 more elements