§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0300779A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Pneumatic Tyre

Assignee: Sumitomo Rubber Industries Ltd
•
Filing: 1988-07-21
•
Granted: —
•
Expires: 2008-07-21
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A pneumatic tyre comprising a pair of bead cores (2), a carcass (6) turned up around said bead cores (2) to form a pair of turnup portions (6A, 6B), a pair of bead apexes (9) extending radially outwardly from said bead cores (2) respectively, a tread (5) disposed radially outside the crown portion of said carcass (6) and a belt (9) disposed between said carcass (6) and said tread (5) characterised in that the belt (7) comprises at least two plies (7A, 7B) of cords including a narrower belt ply (7B) and a wider belt ply (7), the width (WB) of said narrower belt ply (7B) being larger than the ground contact width (WS) defined as the axial distance between the edges of the ground contacting region of said tread (5) the ration Hb/H of a radial height Hb, from the upper end of said bead core (2) to the upper end of said bead apex (a) to the tyre sectional height H, is less than 0.4, and the ratio Hc/Hb of the radial height Hc, from said upper end of said bead core (2) to the upper end of said carcass turnup portion (6B) to said height Hb of said upper end (9a) of said bead apex (9) is less than 0.5.

Inventors

  • 👤 Kiichiro Kakumu
  • 👤 Tokuzo Nakajima

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-27 07:26
CPC Classifications
B; B60; B60C; B60C11/00; B60C3/00; B60C3/04

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 213 words
A pneumatic tyre comprising a pair of bead cores (2) a carcass ply (6) turned up around said bead cores (2) to form a pair of turnup portions (6A,6B) a pair of bead apexes (9) extending radially outwardly from said bead cores (2) respectively, a tread (5) disposed radially outside the crown portion of said carcass (6) and a belt (4) disposed between said carcass (6) and said tread (5) characterised in that the belt (7) comprises at least two plies (7A, 7B) of cords including a narrower belt ply (7B) and a wider belt ply (7A) the width (WB) of said narrower belt ply (7B) being larger than the ground contact width (WS) defined as the axial distance between the edges of the ground contacting region of said tread (5), the ratio Hb/H of a radial height Hb, from the upper end of said bead core (2) to the upper end of said bead apex (a) to the tyre sectional height H, is less than 0.4 and the ratio Hc/Hb of the radial height Hc, from said upper end of said bead core (2) to the upper end of said carcass turnup portion (6B) to said height Hb of said upper end (9a) of said bead apex (9) is less than 0.5.
Claim 2
Dependent Claim 213 words
A pneumatic tyre comprising a pair of bead cores (2) a carcass ply (6) turned up around said bead cores (2) to form a pair of turnup portions (6A,6B) a pair of bead apexes (9) extending radially outwardly from said bead cores (2) respectively, a tread (5) disposed radially outside the crown portion of said carcass (6) and a belt (4) disposed between said carcass (6) and said tread (5) characterised in that the belt (7) comprises at least two plies (7A, 7B) of cords including a narrower belt ply (7B) and a wider belt ply (7A) the width (WB) of said narrower belt ply (7B) being larger than the ground contact width (WS) defined as the axial distance between the edges of the ground contacting region of said tread (5), the ratio Hb/H of a radial height Hb, from the upper end of said bead core (2) to the upper end of said bead apex (a) to the tyre sectional height H, is less than 0.4 and the ratio Hc/Hb of the radial height Hc, from said upper end of said bead core (2) to the upper end of said carcass turnup portion (6B) to said height Hb of said upper end (9a) of said bead apex (9) is less than 0.5.
Claim 3
Dependent Claim 28 words
A pneumatic tyre according to claim 1 characterised in that the tread (5) is made of rubber having a JIS A hardness of not more than 60 degrees.
Claim 4
Dependent Claim 28 words
A pneumatic tyre according to claim 1 or claim 2, characterised in that the tread (5) is made of rubber having a thickness of not less than 10mm.
Claim 5
Dependent Claim 54 words
A pneumatic tyre according to claims 1, 2 or 3 characterised in that the thickness T1 of the tread (5) at the tyre equator (C) is larger than the thickness T2 of the edges of the ground contacting region (12) of the tread (5) and the difference T1-­T2 therebetween is not less than 10.5mm.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag