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Patent Searching and Data


Title:
PROTECTIVE COVER AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2013/072958
Kind Code:
A1
Abstract:
The purpose of the invention is to provide a protective cover having a novel structure that is able to achieve a large extension-contraction stroke in the axial direction by an increase of the axial dimension during extension and a decrease of the axial dimension during contraction, and a manufacturing method therefor. A protective cover (10) formed in a cylindrical shape and having a bellows section (24) in which multiple valley sections (28) and multiple ridge sections (26) are alternately formed, wherein the valley sections (28) of the bellows section (24) have large valley sections (30) and intermediate valley sections (32), the internal and external diameters of the bottoms of which are larger than the large valley sections (30). Multiples of both the large valley sections (30) and the intermediate valley sections (32) are alternately formed, and small valley sections (34), the internal and external diameters of the bottoms of which are larger than the intermediate valley sections (32), are provided between each large valley section (30) and intermediate valley section (32). Meanwhile, between the large valley sections (30) and the small valley sections (34) and between the intermediate valley sections (32) and the small valley sections (34), respective ridge sections (26) are formed. The external diameters of the apices of the multiple ridge sections (26) are configured to be the same and the apices of the ridge sections (26) are configured to be thinner-walled than the bottoms of the large valley sections (30).

Inventors:
MATSUMURA HIROYUKI (JP)
NAKAMURA YORIKAZU (JP)
Application Number:
JP2011/006366
Publication Date:
May 23, 2013
Filing Date:
November 15, 2011
Export Citation:
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Assignee:
TOKAI RUBBER IND LTD (JP)
MATSUMURA HIROYUKI (JP)
NAKAMURA YORIKAZU (JP)
International Classes:
F16F9/38; F16J3/04; F16J15/52; F16L11/11
Foreign References:
JPS59152285U1984-10-12
JPS59180049U1984-12-01
JPS58116858U1983-08-09
JPS4929219B11974-08-02
JPH10267124A1998-10-09
Attorney, Agent or Firm:
KASAI, Yoshitaka et al. (JP)
Yoshitaka Kasai (JP)
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Claims: