CA1146839A - Multistrand reinforcement cord for elastomers - Google Patents
Multistrand reinforcement cord for elastomersInfo
- Publication number
- CA1146839A CA1146839A CA000367691A CA367691A CA1146839A CA 1146839 A CA1146839 A CA 1146839A CA 000367691 A CA000367691 A CA 000367691A CA 367691 A CA367691 A CA 367691A CA 1146839 A CA1146839 A CA 1146839A
- Authority
- CA
- Canada
- Prior art keywords
- wires
- cord
- wire
- main wires
- group
- 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
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2022—Strands coreless
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2033—Parallel wires
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2095—Auxiliary components, e.g. electric conductors or light guides
- D07B2201/2097—Binding wires
Landscapes
- Ropes Or Cables (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A reinforcement cord for elastomers comprises three generally parallel and coplanar main wires of steel extending longitudinally as a group in edge-to-edge contact with one another. A wrap steel wire similar to these main wires is wound around the group of main wires. When the cord of the invention is embedded in an elastomer, each and every wire is in contact with the embedding elastomer. Thus, transmission of tension between the wires and the elastomer is maximized, while protection of the wires both from corrosion and from rubbing on one another is minimized. The cord of the invention is particularly suitable for use in tires, inner tubes, conveyor belts and the like.
A reinforcement cord for elastomers comprises three generally parallel and coplanar main wires of steel extending longitudinally as a group in edge-to-edge contact with one another. A wrap steel wire similar to these main wires is wound around the group of main wires. When the cord of the invention is embedded in an elastomer, each and every wire is in contact with the embedding elastomer. Thus, transmission of tension between the wires and the elastomer is maximized, while protection of the wires both from corrosion and from rubbing on one another is minimized. The cord of the invention is particularly suitable for use in tires, inner tubes, conveyor belts and the like.
Description
~q~
The present invention relates to a multistrand rein-forcement cord for elastomers. More particularly, the invention concerns a reinforcement cord for use in tires, inner tubes, conveyor belts, and the like.
Tire cord is used in conveyor belts, motor-vehicle tires, inner tubes, and the like. It is normally formed of three to five separate wires that are wound together. It is standard practice to use brass-plated wire in order to increase the bond between the wire and the elastomer in which it will be embedded. ~ormally very thin steel wires are used, having diametçrs between 0.1 mm and 0.40 mm. These wires are wound together like standard cable and then imbedded in the elastomer which they are to reinforce. Such cord is subjected to consi-derable tension, bending stress, axial compression as well as inner wear, corrosion, and metal fatigue. In fact, the environ-ment in which such wire is used is normally very hostile.
It has been suggested that the best way of decreasing the d~eleterious effects on the reinforcing cord is to imbed it as thoroughly as possible in the elastomer. Thus U.S. Patents 4,022,009 and 4,030,248 have proposed to make thè wire as open as possible so that the elastomer in which it is imbedded will be able to directly contact as much of the surface of the wire as possible. In accordance with these patents, several main wires and wound together in parallel line contact with each other in a helix, and another wrap wire is wound around these main wires in a helix of identical hand, but lying on the inside of ~he helix formed by the main wires.
Such arrangement has given some advantages over the normal relatively solid wire. However, the central wires of the main helix of such a cord are frequently almost completely out of contact with the elastomer in which the cord is imbedded.
As a result, some of the above-described problems are still encountered with this type of cord.
It is therefore an ob~ect of the present invention to provide an improved reinforcement cord for elastomers.
It is another object of the invention to provide a reinforcement cord which allows each and every wire of the cord to be imbedded in an elastomer with virtually all of the surfaces of the wires in contact with the imbedding elastomer.
In accordance with the present invention, there is thus provided a reinforcement cord for elastomers, which comprises three generally parallel and coplanar main wires of steel extending longitudinally as a group in edge-to-edge line contact with one another, and a wrap steel wire similar to the main wires and w~und around the group of main wires.
With this arrangement, the wires will have vir-tually all of their surfaces exposed for direct contact with the elastomer in which they are imbedded. Thus, transmission of tension between the wires and the elastomer is maximized, while protection of the wires both from corrosion and from rubbing on one another is minimized. At the same time, the full tensile strength of the wires will be fully effective when the cord is imbedded in an elastomer.
According to a preferred feature of the invention, the wrap wire is wound around the group of main wires with a pitch such that the length of the wrap wire exceeds that of the paral~el wires by no more than 3/O~ and also at least two of the main wires cross each other at crossing points spaced apart by a distance of no more than 15 cm.
Thus, in the cord of the invention, all wires are compressed together and such cord has all of the longitudinal :~9 tensile strength of the prior-art cords of more compact construction. Such cord is normally supplied ready-made on spools to the manufacturer of tires, conveyor belts, or the like. The individual wires are also normally of the prestretched steel type of great tensile strength.
In another preferred embodiment of this invention, all four wires of the cord are of identical material and have substantially the same diameter. The diameters may lie between 0.10 mm and 0.40 mm. This small difference in diameter between the wrap wire and the main wires permits the wrap wire to be wound at the desired pitch. The three main wires contact each other in substantially line contact over the full length.
The cord according to the invention is normally straight and free of internal tension in the unstressed condition. Thus, the production of calandered inserts for radial tires is a relatively easy procedure with a cord in accordance with the invention.
As already mentioned, two of the three main wires may periodically cross each other: the wrap wire preferably crosses the group of main wires between the crossings of the main wires. Thus, any minor differences in length or com-position of these two wires will be compensated for.
During construction, the wrap wire is normally pressed into tight permanent contact with the main wires, so as to be somewhat plastically deformed in its wound condition therearound. ~s a result, the cord according to the invention is mechanically very stable both when longi-tudinally stressed or unstressed.
In the accompanying drawings:
~",46~
FIGS. 1, 2 and 3 are large-scale cross sections through prior-art cords, FIG. 4 is a side view of the prior-art cable shown in Fig. 2, FIG. 5 is a cross section through a cord according ~4~9 to the instant invention and FIG. 6 is a perspective view showing the cord of FIG. 5.
As shown in FIGS. 1, 2, 3, respectively, it is standard practice to form a wire cord of 3, 4 or 5 wires W wound as shown in FIG. 4 for the four-wire cord in a tight helix.
With such arrangement,it is apparent that the elastomer in which such a cord is to be imbedded will hardly be able to contact all of the surface of the wires W.
FIGS. 5 and 6 show a cord according to the invention, which is formed of three identical steel wires 1, 2 and 3 which are parallel and coplanar in a common plane P so that the wire 1 contacts the wire 2 in line contact and the wire 2 contacts the wire 3 in line contact. A fourth such wire 4 is wound around the band formed by the three wires 1-3 with a pitch such that the length of the wrap wire 4 exceeds that of the parallel wires 1-3 by no more than 3%.
FIG. 6 also shows how the wires 1 and 3 are reversed at a crossing 5 so that any variations in length between the wires 1 and 3 will be compensated for.
The cord shown in FIGS. 5 and 6 is ideally suitable for use in a calandered body such as an insert for a radial tire. During such calandering, the elastomer forming the insert will contact and bond to virtually all of the surfaces of all the wires 1-4. No central hollow space as is apparent in FIGS. 1-3 is formed by these wires 1-4, so that extremely good force transmission between the wires 1-4 and the body in which they are embedded is insured. Furthermore, since the contact between the wires 1-4 is minimized, and consists only of a line contact, the amount of wear resulting from~the wires rubbing on each other is reduced to an absolute minimum.
~`~
Normally such cord is supplied to the tire manufac-turer or other manufacturer in the form seen in FIGS. 5 and 6, but wound up on spools. Once the cord has been assembled on a standard cabling machine which can easily be adapted to produce the cord according to this invention, it is passed through rollers so as to.,permanently deform the wrap wire 4 into contact with the wires 1-4.
The present invention relates to a multistrand rein-forcement cord for elastomers. More particularly, the invention concerns a reinforcement cord for use in tires, inner tubes, conveyor belts, and the like.
Tire cord is used in conveyor belts, motor-vehicle tires, inner tubes, and the like. It is normally formed of three to five separate wires that are wound together. It is standard practice to use brass-plated wire in order to increase the bond between the wire and the elastomer in which it will be embedded. ~ormally very thin steel wires are used, having diametçrs between 0.1 mm and 0.40 mm. These wires are wound together like standard cable and then imbedded in the elastomer which they are to reinforce. Such cord is subjected to consi-derable tension, bending stress, axial compression as well as inner wear, corrosion, and metal fatigue. In fact, the environ-ment in which such wire is used is normally very hostile.
It has been suggested that the best way of decreasing the d~eleterious effects on the reinforcing cord is to imbed it as thoroughly as possible in the elastomer. Thus U.S. Patents 4,022,009 and 4,030,248 have proposed to make thè wire as open as possible so that the elastomer in which it is imbedded will be able to directly contact as much of the surface of the wire as possible. In accordance with these patents, several main wires and wound together in parallel line contact with each other in a helix, and another wrap wire is wound around these main wires in a helix of identical hand, but lying on the inside of ~he helix formed by the main wires.
Such arrangement has given some advantages over the normal relatively solid wire. However, the central wires of the main helix of such a cord are frequently almost completely out of contact with the elastomer in which the cord is imbedded.
As a result, some of the above-described problems are still encountered with this type of cord.
It is therefore an ob~ect of the present invention to provide an improved reinforcement cord for elastomers.
It is another object of the invention to provide a reinforcement cord which allows each and every wire of the cord to be imbedded in an elastomer with virtually all of the surfaces of the wires in contact with the imbedding elastomer.
In accordance with the present invention, there is thus provided a reinforcement cord for elastomers, which comprises three generally parallel and coplanar main wires of steel extending longitudinally as a group in edge-to-edge line contact with one another, and a wrap steel wire similar to the main wires and w~und around the group of main wires.
With this arrangement, the wires will have vir-tually all of their surfaces exposed for direct contact with the elastomer in which they are imbedded. Thus, transmission of tension between the wires and the elastomer is maximized, while protection of the wires both from corrosion and from rubbing on one another is minimized. At the same time, the full tensile strength of the wires will be fully effective when the cord is imbedded in an elastomer.
According to a preferred feature of the invention, the wrap wire is wound around the group of main wires with a pitch such that the length of the wrap wire exceeds that of the paral~el wires by no more than 3/O~ and also at least two of the main wires cross each other at crossing points spaced apart by a distance of no more than 15 cm.
Thus, in the cord of the invention, all wires are compressed together and such cord has all of the longitudinal :~9 tensile strength of the prior-art cords of more compact construction. Such cord is normally supplied ready-made on spools to the manufacturer of tires, conveyor belts, or the like. The individual wires are also normally of the prestretched steel type of great tensile strength.
In another preferred embodiment of this invention, all four wires of the cord are of identical material and have substantially the same diameter. The diameters may lie between 0.10 mm and 0.40 mm. This small difference in diameter between the wrap wire and the main wires permits the wrap wire to be wound at the desired pitch. The three main wires contact each other in substantially line contact over the full length.
The cord according to the invention is normally straight and free of internal tension in the unstressed condition. Thus, the production of calandered inserts for radial tires is a relatively easy procedure with a cord in accordance with the invention.
As already mentioned, two of the three main wires may periodically cross each other: the wrap wire preferably crosses the group of main wires between the crossings of the main wires. Thus, any minor differences in length or com-position of these two wires will be compensated for.
During construction, the wrap wire is normally pressed into tight permanent contact with the main wires, so as to be somewhat plastically deformed in its wound condition therearound. ~s a result, the cord according to the invention is mechanically very stable both when longi-tudinally stressed or unstressed.
In the accompanying drawings:
~",46~
FIGS. 1, 2 and 3 are large-scale cross sections through prior-art cords, FIG. 4 is a side view of the prior-art cable shown in Fig. 2, FIG. 5 is a cross section through a cord according ~4~9 to the instant invention and FIG. 6 is a perspective view showing the cord of FIG. 5.
As shown in FIGS. 1, 2, 3, respectively, it is standard practice to form a wire cord of 3, 4 or 5 wires W wound as shown in FIG. 4 for the four-wire cord in a tight helix.
With such arrangement,it is apparent that the elastomer in which such a cord is to be imbedded will hardly be able to contact all of the surface of the wires W.
FIGS. 5 and 6 show a cord according to the invention, which is formed of three identical steel wires 1, 2 and 3 which are parallel and coplanar in a common plane P so that the wire 1 contacts the wire 2 in line contact and the wire 2 contacts the wire 3 in line contact. A fourth such wire 4 is wound around the band formed by the three wires 1-3 with a pitch such that the length of the wrap wire 4 exceeds that of the parallel wires 1-3 by no more than 3%.
FIG. 6 also shows how the wires 1 and 3 are reversed at a crossing 5 so that any variations in length between the wires 1 and 3 will be compensated for.
The cord shown in FIGS. 5 and 6 is ideally suitable for use in a calandered body such as an insert for a radial tire. During such calandering, the elastomer forming the insert will contact and bond to virtually all of the surfaces of all the wires 1-4. No central hollow space as is apparent in FIGS. 1-3 is formed by these wires 1-4, so that extremely good force transmission between the wires 1-4 and the body in which they are embedded is insured. Furthermore, since the contact between the wires 1-4 is minimized, and consists only of a line contact, the amount of wear resulting from~the wires rubbing on each other is reduced to an absolute minimum.
~`~
Normally such cord is supplied to the tire manufac-turer or other manufacturer in the form seen in FIGS. 5 and 6, but wound up on spools. Once the cord has been assembled on a standard cabling machine which can easily be adapted to produce the cord according to this invention, it is passed through rollers so as to.,permanently deform the wrap wire 4 into contact with the wires 1-4.
Claims (6)
1. A reinforcement cord for elastomers, said cord comprising:
three generally parallel and coplanar main wires of steel extending longitudinally as a group in edge-to-edge contact with one another; and a wrap steel wire similar to said main wires and wound around said group of main wires.
three generally parallel and coplanar main wires of steel extending longitudinally as a group in edge-to-edge contact with one another; and a wrap steel wire similar to said main wires and wound around said group of main wires.
2. The cord defined in claim 1, wherein the wrap wire is wound around the group of main wires with a pitch such that the length of the wrap wire exceeds that of the parallel wires by no more than 3%.
3. The cord defined in claim 2, wherein at least two of said main wires cross each other at crossing points spaced apart by a distance of no more than 15 cm.
4. The cord defined in claim 1, wherein said wires have substantially the same diameter.
5. The cord defined in claims 1 or 4, wherein said wires have diameters between 0.1 mm and 0.4 mm.
6. The cord defined in claim 1, wherein two of said main wires cross each other at crossing points spaced apart by a distance of no more than 15 cm and wherein said wrap wire crosses said group of main wires between said crossing points.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU82.707 | 1980-08-12 | ||
| LU82707A LU82707A1 (en) | 1980-08-12 | 1980-08-12 | SINGLE-LEADED WIRE ROPE SUITABLE FOR REINFORCING ELASTOMERIC PRODUCTS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1146839A true CA1146839A (en) | 1983-05-24 |
Family
ID=19729465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000367691A Expired CA1146839A (en) | 1980-08-12 | 1980-12-30 | Multistrand reinforcement cord for elastomers |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU7043581A (en) |
| BE (1) | BE886238A (en) |
| CA (1) | CA1146839A (en) |
| DE (2) | DE3042031A1 (en) |
| FR (1) | FR2488626B1 (en) |
| GB (1) | GB2081763A (en) |
| LU (1) | LU82707A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4464892A (en) * | 1983-03-11 | 1984-08-14 | The Goodyear Tire & Rubber Company | Metallic cable for reinforcing elastomeric articles |
| BR8403847A (en) * | 1983-08-15 | 1985-07-09 | Goodyear Tire & Rubber | REINFORCING ELEMENT FOR ELASTOMERIC ITEM AND ELASTOMERIC ITEM |
| KR860008863A (en) * | 1985-05-17 | 1986-12-18 | 알. 제이. 반스틸란드 | Steel cord for reinforcing elastic products |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB225477A (en) * | 1924-06-24 | 1924-12-04 | American Chain & Cable Co | Improvements in or relating to wire cables |
| US1611147A (en) * | 1926-04-09 | 1926-12-14 | Nat Standard Co | Reenforcing element for pneumatic-tire beads |
| US1612922A (en) * | 1926-04-20 | 1927-01-04 | Nat Standard Co | Tire-bead reenforcing element |
| US1774748A (en) * | 1928-07-05 | 1930-09-02 | Gore Thomas | Reenforcing element for the beads of automobile shoes |
| US1767772A (en) * | 1929-03-13 | 1930-06-24 | Nat Standard Co | Tire-bead reenforcing element |
| US1849781A (en) * | 1931-02-05 | 1932-03-15 | Thompson Wire Company | Reenforcing element for beads of rubber tires |
| FR731314A (en) * | 1932-02-12 | 1932-09-01 | Trefilerie Et Cablerie J Wurth | Improvements in the manufacture of steel rods for automobile tire casings |
| BE655590A (en) * | 1964-11-12 | 1965-03-01 | ||
| US3625809A (en) * | 1970-02-24 | 1971-12-07 | Owens Corning Fiberglass Corp | Filament blend products |
| IT1059752B (en) * | 1975-05-12 | 1982-06-21 | Akzo Nv | REINFORCEMENT CABLE FOR ELASTOMERIC TICLES AND RELATED METHOD AND MANUFACTURING APPARATUS |
| JPS55136534A (en) * | 1979-04-13 | 1980-10-24 | Tokyo Seikou Kk | Production of steel cord |
-
1980
- 1980-08-12 LU LU82707A patent/LU82707A1/en unknown
- 1980-11-07 DE DE19803042031 patent/DE3042031A1/en not_active Withdrawn
- 1980-11-07 DE DE19808029762 patent/DE8029762U1/en not_active Expired
- 1980-11-18 BE BE6/47322A patent/BE886238A/en not_active IP Right Cessation
- 1980-12-30 CA CA000367691A patent/CA1146839A/en not_active Expired
-
1981
- 1981-04-07 FR FR8106937A patent/FR2488626B1/en not_active Expired
- 1981-05-01 GB GB8113498A patent/GB2081763A/en not_active Withdrawn
- 1981-05-11 AU AU70435/81A patent/AU7043581A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| FR2488626A1 (en) | 1982-02-19 |
| AU7043581A (en) | 1982-02-18 |
| LU82707A1 (en) | 1982-05-10 |
| FR2488626B1 (en) | 1986-04-25 |
| DE8029762U1 (en) | 1982-07-08 |
| DE3042031A1 (en) | 1982-03-18 |
| BE886238A (en) | 1981-03-16 |
| GB2081763A (en) | 1982-02-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |