Sumitomo (sei) Steel Wire Corp.

Sumitomo Electric Tochigi Co., Ltd.

Hitoshi Wakahara

Kenichi Okamoto

Yuichi Sano

Hiroshi Sasabe

Koji Kato

Masaki Saito

A method of manufacturing an annular concentric stranded bead cord, wherein, while rotating an annular core at a fixed position in a peripheral direction, a reel, upon which a lateral wire is wound, repeatedly performs a pendulum swinging movement and a perpendicular movement with respect to the annular core, thereby spirally winding the lateral wire upon the annular core to form a sheath layer. When forming the sheath layer, a fulcrum of the pendulum swinging movement of the reel is determined so that, with reference to a tangential line of a circle of the annular core passing through a winding point where the lateral wire is wound upon the annular core, the lateral wire is wound upon the winding point of the annular core within 15 degrees at a position above the tangential line and within a range of 55 degrees at a position below the tangential line.

Method and apparatus of manufacturing annular concentric stranded bead cord

An annular metal cord includes an annular core portion and an outer layer portion. The annular core portion is formed by connecting together both ends of a first strand material which is made up of six twisted first metal filaments. The outer layer portion is formed by winding spirally a second strand material which is made up of six twisted second metal filaments around the annular core portion. The second strand material is wound at a predetermined winding angle relative to a center axis of the annular core portion, and a winding initiating end portion and a winding terminating end portion are connected together. As a result, the breaking strength of the annular metal cord can be made large, and the production thereof can be facilitated.

Annular metal cord and endless metal belt

The disclosed bead cord which is lightweight and inexpensive and high in formability includes an annular core and a wrap wire helically wrapped around the annular core, the annular core being made of a medium carbon steel or an alloy steel having a lower carbon content and containing specific elements in suitable amounts. The diameter dof alular core satisfies 1.04&#x2266;d/d&#x2266;1.30 where dis the diameter of the wrap wire. The wrap wire has a coil diameter Dwhich is 0.5 to 1.3 times diameter Dof an annular shape of the annular core. The annular core may be formed with a plating layer of an Al&#x2014;Zn alloy or a thick plating layer of Zn, or the annular core may be made of stainless steel.

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Tochigi, Japan

Hitoshi Wakahara