Sumitomo (sei) Steel Wire Corp.

Sumitomo Electric Tochigi Co., Ltd.

Hiroshi Sasabe

Kenichi Okamoto

Hitoshi Wakahara

Yuichi Sano

Koji Kato

Masaki Saito

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.

Annular concentric-lay bead cord

Growing community of inventors

Tochigi, Japan

Hiroshi Sasabe