公开(公告)号：JP2002090278A

公开(公告)日：2002-03-27

申请号：JP2000285823

申请日：2000-09-20

Applicant: BRIDGESTONE CORP

Inventor： KINOSHITA TAKASHI ,  MIZUTA YOSHIKI ,  YAMADA TAKAHIRO ,  UEDA SHOGO ,  KUDO EIJI ,  KIMURA YUICHI ,  SAGAWA YUKIO

IPC: G01B7/16 ,  D07B7/02 ,  G01B7/30 ,  G01N3/26

Abstract: PROBLEM TO BE SOLVED: To accurately measure residual torsion, and at the same time improve productivity. SOLUTION: When a terminal 12A of a cord 12 that is pinched by a chuck 61 is inserted between two electrodes 20 and 22 of a residual torsion-measuring device 10, a rotor 14 is rotated in the direction of an arrow B, and the electrode 22 is brought into contact with the terminal 12A of the cord 12. At this time, a control device 24 stops the rotation of the rotor 14 and stores a detection angle α. After that, the chuck 61 is opened, the rotor 14 is rotated in the direction of the arrow B, and the terminal 12A of the cord 12 is brought into contact with the electrode 22 again. An electric signal at this time is inputted to the control device 24, and the control device 24 stops the rotation of the rotor 14 and stores a detection angle α2, and at the same time calculates the residual torsion of the cord 12 from the difference between the detection angles α1 and α2, and displays the result on a display 26 of an operation section 28.

公开(公告)号：JPH07197389A

公开(公告)日：1995-08-01

申请号：JP34913093

申请日：1993-12-28

Applicant: BRIDGESTONE CORP ,  BRIDGESTONE METALPHA CORP

Inventor： YAMANAKA TAKAYA ,  KUDO EIJI

IPC: B60C9/00 ,  B60C9/20 ,  D07B1/06

Abstract: PURPOSE:To obtain a steel cord for reinforcing a rubber article of a three-layer laid structure capable of improving the corrosion resistance and productivity in spite of the maintenance of a high cord strength and good fatigue resistance which are advantages of a multilayer laid steel cord. CONSTITUTION:This three-layer laid steel cord for reinforcing a rubber article comprises a core 1 composed of two wires, an intermediate sheath composed of 6 wires wound around the core and further an outer layer sheath 3 composed of 11 wires wound around the intermediate sheath. In the steel cord, the ratio (ds/dc) of the diameter (ds) of the wires in the outer layer sheath to the diameter (dc) of the wires constituting the core is within the range of 1.15-1.5 and the laying pitch of the core is >=20mm.