Title: Pneumatic tire with an internal damage indicator

Abstract: Projections made of a different and less abrasion resistant kind of rubber to that constituting the exterior of the tire are arranged to contact the road during low pressure conditions, whereby the amount of rubber worn off indicates the amount of fatigue accumulated and degree of internal damage done by running the tire at that pressure.

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Inventors: Yabuta, Keiichiro (Yokohama, JP)
Marumo, Nagayuki (Yokohama, JP)
Shimabara, Yoichi (Takatsuki, JP)
Ishigaki, Masahiro (Ibaragi, JP)
Ishihara, Ken (Ibaragi, JP)
Mayama, Yoshiki (Nishinomiya, JP)

Application Number: 773349
Filing Date: 1977-03-01
Publication_date: 1979-03-20
Assignee: Nissan Motor Company, Limited (Yokohama, JP); The Toyo Rubber Co., Ltd. (Osaka, JP)
Primary Class(es): 152/154.2 116/34R, 152/523
Other Classes:
US Patent Ref:

2706509	Apr, 1965	White	152/330.
3362376	Jan, 1968	Norton	152/330.
3400745	Sep, 1968	Schwartz	152/352.
3516467	Jun, 1970	Sims	152/330.
3786850	Jan, 1974	Turocz, Jr.	152/330.

Other Refs: 1362008

Apr, 1964	FR

Primary Examiner: Oresky, Lawrence J.
Assistant Examiner: Underwood, D. W.
Attorney: