CA1242963A - Pneumatic tires - Google Patents
Pneumatic tiresInfo
- Publication number
- CA1242963A CA1242963A CA000484447A CA484447A CA1242963A CA 1242963 A CA1242963 A CA 1242963A CA 000484447 A CA000484447 A CA 000484447A CA 484447 A CA484447 A CA 484447A CA 1242963 A CA1242963 A CA 1242963A
- Authority
- CA
- Canada
- Prior art keywords
- distance
- ply
- tire
- strip
- point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
Abstract of the Disclosure PNEUMATIC TIRES
A radial pneumatic tire (10) having bead portions (11) in which the carcass ply (17) passes from the axially inner side of the bead core and is wrapped around the outside of the bead core back into contact the carcass ply. An apex strip (21) of hardness greater that 80° Shore A is located directly in contact with the ply (17) in each bead portion (11) and a chafer strip (21) of a hardness of between 60-80° Shore A is located axially outside the apex strip (21) in each bead portion (11). There is a minimum hardness difference of 10° Shore A between the apex strip and the chafer strip.
A radial pneumatic tire (10) having bead portions (11) in which the carcass ply (17) passes from the axially inner side of the bead core and is wrapped around the outside of the bead core back into contact the carcass ply. An apex strip (21) of hardness greater that 80° Shore A is located directly in contact with the ply (17) in each bead portion (11) and a chafer strip (21) of a hardness of between 60-80° Shore A is located axially outside the apex strip (21) in each bead portion (11). There is a minimum hardness difference of 10° Shore A between the apex strip and the chafer strip.
Description
~2~ 3 PNEUMATIC TIRES
.. _ Background of the Invention This invention relates to pneumatic tires and in particular to radial tires for passenger cars.
Passenger radial car tires of present day construction typically have tire beads in which a bead core is surmounted by a filler strip of hard rubber having a triangular cross-section. The function of the filler strip is to bring about a gradual transition between the stiff bead portion of the tire and the very flexible sidewall areas. Such tires are illustrated in US Patents Nos 4,258,775, 4,236,563 and 3,232,331.
The present invention is a new and improved tire construction which achieves to good compromise between the requirements of the filler strip (sometimes called an apex strip), the requirements for sealing against a wheel rim, and a carcass construction in the bead area which reduces tension between the carcass plies and the filler strip.
Summary of Invention According to the present invention there is provided a pneumatic tire having a carcass with a pair of bead portions each of which contains a circumferentially extending bead core, at least one reinforcing ply extending between the bead cores and which passes on the axially inner side of each bead core and has turn-up portions wrapped around the outer side of each core into overlapping contact with the ply, an apex strip located in each bead portion and placed in direct contact with the outside of both the ply and the turn-up and being formed of an elastomeric material having a hardness in excess of 80 Shore A, and a chafer strip located in each bead portion adjacent and in contact with the axial outer side of the apex strip, said chafer strip extending at least to
.. _ Background of the Invention This invention relates to pneumatic tires and in particular to radial tires for passenger cars.
Passenger radial car tires of present day construction typically have tire beads in which a bead core is surmounted by a filler strip of hard rubber having a triangular cross-section. The function of the filler strip is to bring about a gradual transition between the stiff bead portion of the tire and the very flexible sidewall areas. Such tires are illustrated in US Patents Nos 4,258,775, 4,236,563 and 3,232,331.
The present invention is a new and improved tire construction which achieves to good compromise between the requirements of the filler strip (sometimes called an apex strip), the requirements for sealing against a wheel rim, and a carcass construction in the bead area which reduces tension between the carcass plies and the filler strip.
Summary of Invention According to the present invention there is provided a pneumatic tire having a carcass with a pair of bead portions each of which contains a circumferentially extending bead core, at least one reinforcing ply extending between the bead cores and which passes on the axially inner side of each bead core and has turn-up portions wrapped around the outer side of each core into overlapping contact with the ply, an apex strip located in each bead portion and placed in direct contact with the outside of both the ply and the turn-up and being formed of an elastomeric material having a hardness in excess of 80 Shore A, and a chafer strip located in each bead portion adjacent and in contact with the axial outer side of the apex strip, said chafer strip extending at least to
2~Z~g~3 the axially outer side of the bead core and being formed of an elastomeric material having a hardness of between 60-85 Shore A, there being at least a 10 Shore A hardness difference between the hardnesses of the elastomeric materials of the apex strip and chafer strip.
Preferably each of said turn-up portions ls in overlapping contact with the carcass ply for a distance of at least 10 mm, as measured along the ply, and each apex strip is triangular in radial cross-section and extends radially outwardly in contact with the ply for a distance G which is between 60 % to 80 % af the distance X, where X is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, and G is a radius measured from the point of intPrsection of said first axial plane and the external surface of the tire, and each of said chafer strips extends radially outwardly in contact with i~s respective apex strip for a distance H measured as a radius from said point, and the distance H is between 50 % to 80 % of the distance G.
Brief Description of Drawings The invention will be described by way of example and with reference to the accompanying drawing in which a radial cross-sectional view of one half of a tire according to this invention is illustrated.
Detailed Description of the Invention With reference to the accompanying drawing there is illustrated a radial cross-section through one half of a pneumatic tire for a passenger car. The tire construction is symmetrical about the mid-circumferential plane M-M of the tire 10 and the tire will be described with reference to the drawing as if the drawing were a complete radial cross-section. The tire comprises a pair of annular bead portions 11 for engaging the bead seats of a wheel rim. Each annular bead portion 11 -~ ~ 2 ~ ~9 contains a substantially inextensible annular bead cord 13. A sidewall 12 extends radially outwardly from each bead portion 11 into a crown portion 14 of the tire.
The crown portion 14 has a ground contacting tread 16 extending circumferentially thereabout.
The tire 10 has a radial carcass 17 extending from bead core 13 to bead core 13 and which comprises a singl~ elastomeric ply reinforced by cords of a suitable material such as steel, rayon, or polyamide.
The cords in the carcass ply are parallel to each other, and for the purposes of this invention a radial tire is a tire in which the cords are orientated at an angle of between 75 and 90 with respect to the mid-circumferential plane M-M of the tire. The tire 10 is further reinforced in the crown portion 14 by a circumferentially extending belt structure 18 disposed radially outside the carcass ply 17. The belt structure 18 comprises two reinforced plies 20A and 20B
which are superimposed one on the other, but could also comprise other belt structures which are practiced in art, for example it could comprise folded belts.
In each bead portion 11, the carcass ply 17 passes on the axially inner side of each bead core 13 and has a turn-up portion 19 which is wrapped back around the axially outer side of each core 13 into overlapping contact with the ply 17, so as to completely envelop the core 13. The terms 'axial' and 'axially' refer to displacements along the rotational axis of the tlre and the terms inner and outer refer to axial positions relative to the mid-circumferential plane M-M. The turn-up portion 19 should follow the external surface of the core 13 as closely as possible. However, during manufacture of the tire the bead coat, that is the elastomer surrounding the bead wire, is sometimes squeezed into the space 29 located between the core 13, the ply 17, and the turn-up portion 19. It is ~2~ 3~3 preferable for this space 29 to be as small as possible and its radially outmost point should not be more than 10 mm above the bead core. The overlapping contact between the turn-up portion 19 and the ply 17 should be for a distance of at least 10 mm measured radially outwardly along the ply line but is preferably in the order of 1/3 X where X is the height between a first plane passing through the middle of the bead core 13 parallel to the rotational axis, and a second plane passing through the mid-point on the sidewall 12 of the tire also parallel to said axis, the mid point corresponding with the section diameter SD oE the tire, that is where the tire has a maximum width between the sidewalls.
A filler strip 21, usually known as an apex strip, is located in each bead portion 11 and extend circumferentially around the tire. Each apex strip 21 is subs-tantially triangular in radial cross-section and is placed axially outside the ply 17 and the turn-up portion 19 and is in direct contact with said ply 17 and turn-up portion 19. The base of the triangular apex strip is adjacent the bead core 13. The apex strips are formed from an elastomeric material of a hardness greater than 80 Shore A and preferably about 90 to 95 Shore A.
The advantage of bringing the turn-up portion 19 back into contact with the ply 17 is that, because the ply end 2~ is closer to the neutral axis in the sidewall, there is less load acting on the ply end to initiate separation between the turn-up 19 and the apex strip 21. The neutral axis is usually followed by the carcass ply and is the boundary line in the sidewall between compression stresses and tension stresses.
A chafer strip 22 is located in each bead portion 11, and is adjacent the axially outer side of the respective apex strip 21. Each chafer strip extends radially inwardly at least to the outer side of the -` ~lZ~2~63 bead core 13 and is formed from an elastomeric material having a hardness of between 60-85 Shore A. In the present invention there is a difference in hardnesses of the elastomeric materials of the apex strip 21 and the chafer strip 22 of 10 Shore A and of preferably about 15 Shore A. Preferably the chafer strips 22 in each bead portion 11, forms a portion of the outer surface of the tire extending from adjacent the bead core 13 radially outwardly for a distance V of approximately 1/4 to 1/3 X where it becomes overlapped by the elastomer of the sidewall 12. At the point of overlap an annular raised rib 23 runs circumferentially around the tire. The rib 23 is arranged to be radially outside a wheel rim flange and is a visual aid for helping judge if the tire is correctly fitted onto the wheel rim. The chafer strips 22 therefore help prevent abrasion of the bead portion 11 on the wheel rim on which the tire is mounted since the sidewalls 12 are generally formed of softer elastomeric material having a hardness of less than 60 Shore A.
The turn-up portion 19 has its ply end 2~ at a distance K radially outwardly from a point P, which is the intersection of the axial plane passing through the middle of the bead core 13 and the external surface 27 of the tire. The apex strip 21 extends radially outwards in contact with the ply 17 and its radîally outermost point 28 is a distance G, measured as a radius distance from the point P, of approximately 60 % to 80 % of the height X. The distance K for the ply end 2~, also measured as a radius from the point P
should lie between 25 % to 65 % of the distance G for the apex strip. The chafer strip 22 extends radially outwards for a distance Ht also measured as a radius from P, in contact with the apex strip 21. The distance H should lie between 50 % to 75 % of the dis-tance G.
At the turn-up ply end 24 the thickness Tl of the apex strips 21 and the thickness T2 of the chafer 2 ~ 3 strips 22 when measured perpendicular to the ply line are in the ratio of between 1.5:1 and 3.5:1.
Although there has been shown and described a specific embodiment of the invention it is to be clearly understood that certain changes and modifications can be made by those skilled in the art without departing from the spirit and scope o the invention. For instance the carcass could be formed of more than one ply.
Preferably each of said turn-up portions ls in overlapping contact with the carcass ply for a distance of at least 10 mm, as measured along the ply, and each apex strip is triangular in radial cross-section and extends radially outwardly in contact with the ply for a distance G which is between 60 % to 80 % af the distance X, where X is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, and G is a radius measured from the point of intPrsection of said first axial plane and the external surface of the tire, and each of said chafer strips extends radially outwardly in contact with i~s respective apex strip for a distance H measured as a radius from said point, and the distance H is between 50 % to 80 % of the distance G.
Brief Description of Drawings The invention will be described by way of example and with reference to the accompanying drawing in which a radial cross-sectional view of one half of a tire according to this invention is illustrated.
Detailed Description of the Invention With reference to the accompanying drawing there is illustrated a radial cross-section through one half of a pneumatic tire for a passenger car. The tire construction is symmetrical about the mid-circumferential plane M-M of the tire 10 and the tire will be described with reference to the drawing as if the drawing were a complete radial cross-section. The tire comprises a pair of annular bead portions 11 for engaging the bead seats of a wheel rim. Each annular bead portion 11 -~ ~ 2 ~ ~9 contains a substantially inextensible annular bead cord 13. A sidewall 12 extends radially outwardly from each bead portion 11 into a crown portion 14 of the tire.
The crown portion 14 has a ground contacting tread 16 extending circumferentially thereabout.
The tire 10 has a radial carcass 17 extending from bead core 13 to bead core 13 and which comprises a singl~ elastomeric ply reinforced by cords of a suitable material such as steel, rayon, or polyamide.
The cords in the carcass ply are parallel to each other, and for the purposes of this invention a radial tire is a tire in which the cords are orientated at an angle of between 75 and 90 with respect to the mid-circumferential plane M-M of the tire. The tire 10 is further reinforced in the crown portion 14 by a circumferentially extending belt structure 18 disposed radially outside the carcass ply 17. The belt structure 18 comprises two reinforced plies 20A and 20B
which are superimposed one on the other, but could also comprise other belt structures which are practiced in art, for example it could comprise folded belts.
In each bead portion 11, the carcass ply 17 passes on the axially inner side of each bead core 13 and has a turn-up portion 19 which is wrapped back around the axially outer side of each core 13 into overlapping contact with the ply 17, so as to completely envelop the core 13. The terms 'axial' and 'axially' refer to displacements along the rotational axis of the tlre and the terms inner and outer refer to axial positions relative to the mid-circumferential plane M-M. The turn-up portion 19 should follow the external surface of the core 13 as closely as possible. However, during manufacture of the tire the bead coat, that is the elastomer surrounding the bead wire, is sometimes squeezed into the space 29 located between the core 13, the ply 17, and the turn-up portion 19. It is ~2~ 3~3 preferable for this space 29 to be as small as possible and its radially outmost point should not be more than 10 mm above the bead core. The overlapping contact between the turn-up portion 19 and the ply 17 should be for a distance of at least 10 mm measured radially outwardly along the ply line but is preferably in the order of 1/3 X where X is the height between a first plane passing through the middle of the bead core 13 parallel to the rotational axis, and a second plane passing through the mid-point on the sidewall 12 of the tire also parallel to said axis, the mid point corresponding with the section diameter SD oE the tire, that is where the tire has a maximum width between the sidewalls.
A filler strip 21, usually known as an apex strip, is located in each bead portion 11 and extend circumferentially around the tire. Each apex strip 21 is subs-tantially triangular in radial cross-section and is placed axially outside the ply 17 and the turn-up portion 19 and is in direct contact with said ply 17 and turn-up portion 19. The base of the triangular apex strip is adjacent the bead core 13. The apex strips are formed from an elastomeric material of a hardness greater than 80 Shore A and preferably about 90 to 95 Shore A.
The advantage of bringing the turn-up portion 19 back into contact with the ply 17 is that, because the ply end 2~ is closer to the neutral axis in the sidewall, there is less load acting on the ply end to initiate separation between the turn-up 19 and the apex strip 21. The neutral axis is usually followed by the carcass ply and is the boundary line in the sidewall between compression stresses and tension stresses.
A chafer strip 22 is located in each bead portion 11, and is adjacent the axially outer side of the respective apex strip 21. Each chafer strip extends radially inwardly at least to the outer side of the -` ~lZ~2~63 bead core 13 and is formed from an elastomeric material having a hardness of between 60-85 Shore A. In the present invention there is a difference in hardnesses of the elastomeric materials of the apex strip 21 and the chafer strip 22 of 10 Shore A and of preferably about 15 Shore A. Preferably the chafer strips 22 in each bead portion 11, forms a portion of the outer surface of the tire extending from adjacent the bead core 13 radially outwardly for a distance V of approximately 1/4 to 1/3 X where it becomes overlapped by the elastomer of the sidewall 12. At the point of overlap an annular raised rib 23 runs circumferentially around the tire. The rib 23 is arranged to be radially outside a wheel rim flange and is a visual aid for helping judge if the tire is correctly fitted onto the wheel rim. The chafer strips 22 therefore help prevent abrasion of the bead portion 11 on the wheel rim on which the tire is mounted since the sidewalls 12 are generally formed of softer elastomeric material having a hardness of less than 60 Shore A.
The turn-up portion 19 has its ply end 2~ at a distance K radially outwardly from a point P, which is the intersection of the axial plane passing through the middle of the bead core 13 and the external surface 27 of the tire. The apex strip 21 extends radially outwards in contact with the ply 17 and its radîally outermost point 28 is a distance G, measured as a radius distance from the point P, of approximately 60 % to 80 % of the height X. The distance K for the ply end 2~, also measured as a radius from the point P
should lie between 25 % to 65 % of the distance G for the apex strip. The chafer strip 22 extends radially outwards for a distance Ht also measured as a radius from P, in contact with the apex strip 21. The distance H should lie between 50 % to 75 % of the dis-tance G.
At the turn-up ply end 24 the thickness Tl of the apex strips 21 and the thickness T2 of the chafer 2 ~ 3 strips 22 when measured perpendicular to the ply line are in the ratio of between 1.5:1 and 3.5:1.
Although there has been shown and described a specific embodiment of the invention it is to be clearly understood that certain changes and modifications can be made by those skilled in the art without departing from the spirit and scope o the invention. For instance the carcass could be formed of more than one ply.
Claims (9)
1. A pneumatic tire having a radial carcass with a pair of bead portions each of which contains a circumferentially extending bead core, at least one reinforcing ply extending between the bead cores and passing on the axially inner side of each bead core and having turn-up portions wrapped around the outer side of each core into overlapping contact with the ply, an apex strip located in each bead portion and placed in direct contact with the outside of both the ply and the turn-up and being formed of an elastomer having a hardness in excess of 80° Shore A, and a chafer strip located in each bead portion adjacent and in contact with the axial outside of the apex strip, said chafer strip extending at least to the axially outer side of the bead core and being formed of an elastomer having a hardness of between 60° to 85° Shore A, there being at least a 10° Shore A hardness difference between the hardnesses of the elastomeric materials of the apex strip and the chafer strip.
2. A tire as claimed in Claim 1 wherein each of the chafer strips forms a portion of the outside surface of the tire in the bead area.
3. A tire as claimed in Claim 1 or Claim 2 wherein each of said turn-up portions is in overlapping contact with the carcass ply for a distance of at least 10 mm, as measured along the ply.
4. A tire as claimed in Claim 1 or Claim 2 wherein each of said turn-up portions is in overlapping contact with the carcass ply for a distance of at least 10 mm, as measured along the ply, each apex strip is triangular in radial cross-section and extends radially outwardly in contact with the ply for a distance G
which is between 60% to 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, and G is a radius measured from the point of intersection of said first axial plane and the external surface of the tire.
which is between 60% to 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, and G is a radius measured from the point of intersection of said first axial plane and the external surface of the tire.
5. A tire as claimed in Claim 1 or Claim 2, wherein each of said turn-up portions is in overlapping contact with the carcass ply for a distance of at least 10 mm, as measured along the ply, each apex strip is triangular in radial cross-section and extends radially outwardly in contact with the ply for a distance G
which is between 60% to 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, G
is a radius measured from the point of intersection of said first axial plane and the external surface of the tire, each of the turn-up portions has a ply end which is a distance K from said point measured as a radius and the distance K is between 25% and 65% of the distance G.
which is between 60% to 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, G
is a radius measured from the point of intersection of said first axial plane and the external surface of the tire, each of the turn-up portions has a ply end which is a distance K from said point measured as a radius and the distance K is between 25% and 65% of the distance G.
6. A tire as claimed in Claim 1 or Claim 2 wherein each of said turn-up portions is in overlapping contact with the carcass ply for a distance of at least 10 mm, as measured along the ply, each apex strip is triangular in radial cross-section and extends radially outwardly in contact with the ply for a distance G
which is between 60% to 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, G
is a radius measured from the point of intersection of said first axial plane and the external surface of the tire, each of the turn-up portions has a ply end which is a distance K from said point measured as a radius, the distance K is between 25% and 65% of the distance G, each chafer strip extends radially outwardly in contact with its respective apex strip for a distance H
measured as a radius from said point, and the distance H is between 50% and 80% of the distance G.
which is between 60% to 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, G
is a radius measured from the point of intersection of said first axial plane and the external surface of the tire, each of the turn-up portions has a ply end which is a distance K from said point measured as a radius, the distance K is between 25% and 65% of the distance G, each chafer strip extends radially outwardly in contact with its respective apex strip for a distance H
measured as a radius from said point, and the distance H is between 50% and 80% of the distance G.
7. A tire as claimed in Claim 1 or Claim 2 wherein each of said turn up portions is in overlapping contact with the carcass ply for a distance of at least 10 mm, as measured along the ply, each apex strip is triangular in radial cross-section and extends radially outwardly in contact with the ply for a distance G
which is between 60% to 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, G
is a radius measured from the point of intersection of said first axial plane and the external surface of the tire, each of the turn-up portions has a ply end which is a distance K from said point measured as a radius, the distance K is between 25% and 65% of the distance G, each chafer strip extends radially outwardly in contact with its respective apex strip for a distance H
measured as a radius from said point, the distance H is between 50% and 80% of the distance G and the thickness of each apex strip relative to the thickness of its respective adjacent chafer strip when measured perpendicular to the ply at the turn up ply end, is between 1.5:1 and 3.5:1.
which is between 60% to 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, G
is a radius measured from the point of intersection of said first axial plane and the external surface of the tire, each of the turn-up portions has a ply end which is a distance K from said point measured as a radius, the distance K is between 25% and 65% of the distance G, each chafer strip extends radially outwardly in contact with its respective apex strip for a distance H
measured as a radius from said point, the distance H is between 50% and 80% of the distance G and the thickness of each apex strip relative to the thickness of its respective adjacent chafer strip when measured perpendicular to the ply at the turn up ply end, is between 1.5:1 and 3.5:1.
8. A tire as claimed in Claim 1 wherein the apex strip has a hardness of approximately 90° Shore A, and the difference in hardness between the apex strip and the chafer strip is at least 15° Shore A.
9. A tire as claimed in Claim 1 or Claim 2 wherein each of said turn-up portions is in overlapping contact with the carcass ply for a distance of at least 10 mm, as measured along the ply, each apex strip is triangular in radial cross-section and extends radially outwardly in contact with the ply for a distance G
which is between 60% and 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, G
is a radius measured from the point of intersection of said first axial plane and the external surface of the tire, each chafer strip extends radially outwardly in contact with the respective apex strip for a distance H
measured as a radius from said point, and the distance H is between 50% and 80% of the distance G.
which is between 60% and 80% of the distance X, where X
is the height between a first axial plane passing through the middle of the bead core and a second axial plane passing through the mid-point of the sidewall, G
is a radius measured from the point of intersection of said first axial plane and the external surface of the tire, each chafer strip extends radially outwardly in contact with the respective apex strip for a distance H
measured as a radius from said point, and the distance H is between 50% and 80% of the distance G.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64399484A | 1984-08-24 | 1984-08-24 | |
| US643,994 | 1984-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1242963A true CA1242963A (en) | 1988-10-11 |
Family
ID=24583009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000484447A Expired CA1242963A (en) | 1984-08-24 | 1985-06-19 | Pneumatic tires |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1242963A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5779829A (en) * | 1995-08-24 | 1998-07-14 | The Goodyear Tire & Rubber Company | Pneumatic tire having a single carcass ply reinforced with metallic cords, a high ending ply, turnup and locked bead construction |
-
1985
- 1985-06-19 CA CA000484447A patent/CA1242963A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5779829A (en) * | 1995-08-24 | 1998-07-14 | The Goodyear Tire & Rubber Company | Pneumatic tire having a single carcass ply reinforced with metallic cords, a high ending ply, turnup and locked bead construction |
| US6719030B2 (en) | 1995-08-24 | 2004-04-13 | The Goodyear Tire & Rubber Company | Pneumatic tire having a single carcass ply reinforced with metallic cords, a high ending ply, turnup and locked bead construction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |