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US5205883A Expired / Lapsed US ⏱️ 0.0 years remaining

Pneumatic tire with polygonal bead core

Assignee: Yokohama Rubber Co Ltd
•
Filing: 1991-04-19
•
Granted: 1993-04-27
•
Expires: 2011-04-19
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Abstract

Abstract A pneumatic radial tire having a circular bead core of substantially polygonal cross section which includes a base (a) adjacent an inclined bead base portion of the tire, an inner side (b) on a side of the bead core nearest a bead toe portion of the tire, an outer side (d) on a side of the bead core nearest a bead heel portion of the tire, and a top side (c) opposite the base (a) and joining the inner side (b) and the outer side (d). An inclination θ 1 of the base (a) relative to the axial direction of the tire is substantially the same as that of the bead base portion relative to the axial direction of the tire. A cross angle β between the base (a) and the inner side (b) is 70° to 90°. An inclination θ 2 of the top side (c) relative to the axial direction of the tire is smaller than the inclination θ 1 and the direction of inclination of the top side (c) is opposite to that of the base (a).

Inventors

  • 👤 Masahiko Kanamaru

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 17:54
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/04

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 184 words
A pneumatic radial tire having a circular bead core, wherein said bead core has substantially a polygonal cross section comprising a base (a) adjacent an inclined bead base portion of said tire, an inner side (b) on a side of said bead core nearest a bead toe portion of said tire, an outer side (d) on a side of said bead core nearest a bead heel portion of said tire, and a top side (c) opposite said base (a) and joining said inner side (b) and said outer side (d), an inclination θ 1 of said base (a) relative to the axial direction of the tire is substantially the same as that of said bead base portion relative to the axial direction of the tire, a cross angle β between said base (a) and said inner side (b) is 70° to 90°, an inclination θ 2 of said top side (c) relative to the axial direction of the tire is smaller than said inclination θ 1 and the direction of inclination of said top side (c) is opposite to that of said base (a).
Claim 2
Dependent Claim 184 words
A pneumatic radial tire having a circular bead core, wherein said bead core has substantially a polygonal cross section comprising a base (a) adjacent an inclined bead base portion of said tire, an inner side (b) on a side of said bead core nearest a bead toe portion of said tire, an outer side (d) on a side of said bead core nearest a bead heel portion of said tire, and a top side (c) opposite said base (a) and joining said inner side (b) and said outer side (d), an inclination θ 1 of said base (a) relative to the axial direction of the tire is substantially the same as that of said bead base portion relative to the axial direction of the tire, a cross angle β between said base (a) and said inner side (b) is 70° to 90°, an inclination θ 2 of said top side (c) relative to the axial direction of the tire is smaller than said inclination θ 1 and the direction of inclination of said top side (c) is opposite to that of said base (a).
Claim 3
Dependent Claim 34 words
A pneumatic tire according to claim 1, wherein said inner side (b) on a side of said bead core nearest a bead toe portion of said tire is a straight line or a curve.
Claim 4
Dependent Claim 16 words
A pneumatic tire according to claim 1, wherein the inclination θ 1 is 13° to 18°.
Claim 5
Dependent Claim 16 words
A pneumatic tire according to claim 1, wherein the inclination θ 2 is 2° to 10°.
Claim 6
Dependent Claim 31 words
A pneumatic tire according to claim 1, wherein said bead core is comprised of a plurality of bead wires and each of said bead wires is circular or quadrangular in section.

References Cited (Backward Citations)

BE557915A Cited
DE2044995A1 Cited
DE2458923A1 Cited
US4192368A Cited
US4180116A Cited
FR2591154A1 Cited
US4998575A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-04-26 1996-10-26 1997-04-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-04-26 2000-10-26 2001-04-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-04-26 2004-10-26 2005-04-27 $7700.00 Window Closed / Lapsed

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