Claims
- 1. A method of making a wire cord for reinforcement of resilient articles, comprising:
- (a) forming a central bundle of wires having in transverse cross-section a core of adjacent wire cross-sections,
- (b) surrounding said central bundle with a ring of wire cross-section,
- (c) twisting the cord forming a plurality of cord length sections in close packed configuration, and
- (d) separating each close packed section from one another by a cord length section in a non-close packed configuration over a longitudinal regular twist with at least two, but no more than three hundred, position changes.
- 2. The method according to claim 1, including twisting the wires of the core of wires around each other in the same direction, but with a different pitch with respect to the twist pitch of the circumferential layer, and twisting a layer of wires around said core in the same direction and with the same pitch as the wires of the circumferential layer, said position changes being caused in said central bundle by the difference of twist pitch of the core with respect to the circumferential layer.
- 3. The method according to claim 1, in which said core comprises a number N of wires, N ranging from 3 to 5, said twisted layer around the core comprising N+6 wires and said circumferential layer comprising N+12-n wires, n ranging from 0 to 2.
- 4. The method according to claim 1, in which the wires of the circumferential layer have a twist pitch ranging from 50 to 100 times the wire diameter, and in which the wires of said core are twisted around each other with a twist pitch which differs from the twist pitch of said circumferential layer by more than 10 times the wire diameter.
- 5. The method according to claim 1, in which the wires of the core have a diameter of about 0.5 to 25% of the core wire diameter more than the diameter of the other wires.
- 6. The method according to claim 1, in which the lengthwise subsequently taken transverse cross-sections show on an average over at least 50% of the cord length a substantially compact configuration.
- 7. The method according to claim 6, wherein said average is in the range of about 70 to 97%.
- 8. The method according to claim 1, in which said central bundle comprises a pair number 2M of wires, M ranging from 6 to 8, and the circumferential layer comprises M+9 wires.
- 9. The method according to claim 1, in which the wires of the circumferential layer are twisted around said central bundle with a twist pitch ranging from 50 to 100 times the wire diameter.
- 10. The method according to claim 1, in which the steel cross-sectional area ranges from 0.5 to 3.5 mm.sup.2.
- 11. A method of making a wire cord for reinforcement of resilient articles, comprising:
- (a) forming a central core of wires twisted in the Z direction with a first pitch,
- (b) bundling said central core with a surrounding first layer of wires in the Z direction with a second pitch to form a central bundle, and
- (c) helicoidally twisting a circumferential surrounding layer around said central bundle in the Z direction with said second pitch.
- 12. An apparatus for making a wire cord, comprising:
- (a) means for forming a central core of wires twisted in the Z direction with a first pitch,
- (b) means for bundling said central core with a surrounding first layer of wires in the Z direction with a second pitch to form a bundle, and
- (c) means for helicoidally twisting a circumferential surrounding layer around said bundle in the Z direction with said second pitch.
- 13. An apparatus for making a wire cord for reinforcement of resilient articles, comprising:
- (a) means for forming a central bundle of wires having in transverse cross-section a core of adjacent wire cross-sections,
- (b) means for surrounding said central bundle with a ring of wire cross-section,
- (c) means for twisting the cord forming a plurality of cord length sections in close packed configuration, and
- (d) means for separating each close packed section from one another by a cord length section in a non-close packed configuration over a longitudinal regular twist with at least two, but no more than three hundred, position changes.
- 14. An apparatus according to claim 13, including means for twisting the wires of the core of wires around each other in the same direction, but with a different pitch with respect to the twist pitch of the circumferential layer, and means for twisting a layer of wires around said core in the same direction and with the same pitch as the wires of the circumferential layer, said position changes being caused in said central bundle by the difference of twist pitch of the core with respect to the circumferential layer.
- 15. A method of making a wire cord for reinforcement of resilient articles, comprising:
- (a) forming a central core of wires twisted in the Z direction with a first pitch, said core comprising a number N of wires, N ranging from 3 to 5, said twisted layer around the core comprising N+6 wire and said circumferential layer comprising N+12-n wires, n ranging from 0 to 2,
- (b) bundling said central core with a surrounding first layer of wires in the Z direction with a second pitch to form a central bundle, and
- (c) helicoidally twisting a circumferential surrounding layer around said central bundle in the direction with said second pitch.
- 16. A method of making a wire cord for reinforcement of resilient articles, comprising:
- (a) forming a central core of wires twisted in the Z direction with a first pitch,
- (b) bundling said central core with a surrounding first layer of wires in the Z direction with a second pitch to form a central bundle, and
- (c) helicoidally twisting a circumferential surrounding layer around said central bundle in the Z direction with said second pitch, the wires of the circumferential layer having a twist pitch ranging from 50 to 100 times the wire diameter, and the wires of said core being twisted around each other with a twist pitch which differs from the twist pitch of said circumferential layer by more than 10 times the wire diameter.
- 17. A method of making a wire cord for reinforcement of resilient articles, comprising:
- (a) forming a central core of wires twisted in the Z direction with a first pitch, the wires of the core having a diameter of about 0.5 to 25% of the core wire diameter more than the diameter of the other wires,
- (b) bundling said central core with a surrounding first layer of wires in the Z direction with a second pitch to form a central bundle, and
- (c) helicoidally twisting a circumferential surrounding layer around said central bundle in the Z direction with said second pitch.
- 18. A method of making a wire cord for reinforcement of resilient articles, comprising:
- (a) forming a central core of wires twisted in the Z direction with a first pitch,
- (b) bundling said central core with a surrounding first layer of wires in the Z direction with a second pitch to form a central bundle,
- (c) helicoidally twisting a circumferential surrounding layer around said central bundle in the Z direction with said second pitch, and
- (d) wherein lengthwise subsequently taken transverse cross-sections show on an average over at least 50% of the cord length a substantially compact configuration.
- 19. The method according to claim 18, wherein said average is in the range of about 70 to 97%.
- 20. A method of making a wire cord for reinforcement of resilient articles, comprising:
- (a) forming a central core of wires twisted in the Z direction with a first pitch,
- (b) bundling said central core with a surrounding first layer of wires in the Z direction with a second pitch to form a central bundle, and
- (c) helicoidally twisting a circumferential surrounding layer around said central bundle in the Z direction with said second pitch, said central bundle comprising a pair number 2M of wires, M ranging from 6 to 8, and the circumferential layer comprising M+9 wires.
- 21. A method of making a wire cord for reinforcement of resilient articles, comprising:
- (a) forming a central core of wires twisted in the Z direction with a first pitch,
- (b) bundling said central core with a surrounding first layer of wires in the Z direction with a second pitch to form a central bundle, and
- (c) helicoidally twisting a circumferential surrounding layer around said central bundle in the Z direction with said second pitch, wherein the wires of the circumferential layer are twisted around said central bundle with a twist pitch ranging from about 50 to 100 times the wire diameter.
- 22. A method of making a wire cord for reinforcement of resilient articles, comprising:
- (a) forming a central core of wires twisted in the Z direction with a first pitch,
- (b) bundling said central core with a surrounding first layer of wires in the Z direction with a second pitch to form a central bundle,
- (c) helicoidally twisting a circumferential surrounding layer around said central bundle in the Z direction with said second pitch, and
- (d) wherein the wire cross-sectional area ranges from about 0.5 to about 3.5 mm.
Priority Claims (2)
Number |
Date |
Country |
Kind |
8417485 |
Jul 1984 |
GBX |
|
8426654 |
Oct 1984 |
GBX |
|
Parent Case Info
This is a division of application Ser. No. 748,987, filed June 26, 1985, now U.S. Pat. No. 4,628,683.
US Referenced Citations (11)
Foreign Referenced Citations (1)
Number |
Date |
Country |
143732 |
May 1985 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
748987 |
Jun 1985 |
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