公开(公告)号：US5143353A

公开(公告)日：1992-09-01

申请号：US658868

申请日：1991-02-22

申请人： Hiroaki Sano ,  Yoshiaki Terasawa ,  Shigeru Tanaka

发明人： Hiroaki Sano ,  Yoshiaki Terasawa ,  Shigeru Tanaka

IPC分类号： B65H51/28 ,  G02B6/44 ,  G02B6/46 ,  H02G1/08

CPC分类号： G02B6/4464

摘要： The invention relates to an apparatus for laying an optical fiber unit with a pressure fluid into a previously laid duct line. Specifically, the apparatus performs this operation by a method for causing pressure fluid to flow backward into the guide tube on the feed side of the optical fiber unit so as to generate a buoyant force, so that the load due to the frictional force in the section between the feed side and the driving means can be much reduced. Accordingly, the method according to the present invention is particularly useful for pressure-sending an optical fiber unit into a duct line having insertion resistance, for example, a vertical duct line, a duct line having fine curves, or the like.

公开(公告)号：US4997256A

公开(公告)日：1991-03-05

申请号：US477062

申请日：1990-02-08

申请人： Hiroaki Sano ,  Yoshiaki Terasawa ,  Kuni Hayashi

发明人： Hiroaki Sano ,  Yoshiaki Terasawa ,  Kuni Hayashi

IPC分类号： G02B6/44

CPC分类号： G02B6/4438

摘要： An optical fiber unit suitable for installation by the force of a fluid flowing through a passage. The unit includes at least one optical fiber and at least one interstitial cord. The fibers and cords are of the same diameter. They are bundled and surrounded by a first sheath that is formed of a material having a high Young's modulus. An outer sheath, of foamed polyethelene surrounds the first sheath.