Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
2002-05-09
2004-10-19
Johnstone, Adrienne C. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C057S206000, C057S236000, C057S311000, C057S902000, C152S451000
Reexamination Certificate
active
06805178
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a metallic cord for rubber articles, more particularly to a cord structure capable of improving rubber penetration, flexibility and the like of the cord.
In recent years, in order to improve penetration of rubber into steel cords used to reinforce rubber articles such as pneumatic tires, there has been proposed a cord which is formed by twisting together steel filaments including filaments which are waved by a constant wave length and a constant wave height.
In such a cord, however, buckling is liable to occur on occasion and as a result the fatigue resistance and impact load resistance are decreased.
BRIEF SUMMARY OF THE INVENTION
It is therefore, an object of the present invention to provide a metallic cord in which the occurrence of buckling is effectively controlled to improve the fatigue resistance and impact load resistance as well as the rubber penetration.
According to one aspect of the present invention, a metallic cord is composed of metallic filaments gathered together, the total number of the metallic filaments is in a range of from two to twelve, and the metallic filaments include at least one patterned filament which is, before gathered together, two-dimensionally waved so as to have a wave form defined by plural kinds of cycles different from each other in respect of the wave length P and/or wave height H.
REFERENCES:
patent: 4219601 (1980-08-01), Inoue et al.
patent: 5135039 (1992-08-01), Mizuta et al.
patent: 6089293 (2000-07-01), Niderost
patent: 10236108 (1998-09-01), None
patent: 2000129583 (2000-05-01), None
patent: 2000198311 (2000-07-01), None
Miyazaki Shinichi
Toda Osamu
Yamazaki Kazumi
Johnstone Adrienne C.
Sumitomo Rubber Industries Ltd.
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