| US 7,491,284 B2 | ||
| Manufacturing method of rubber member for tire | ||
| Norio Hayashi, Kobe (Japan); and Toshihiko Omokawa, Kobe (Japan) | ||
| Assigned to Sumitomo Rubber Industries, Ltd., Kobe-shi (Japan) | ||
| Filed on Aug. 02, 2005, as Appl. No. 11/194,601. | ||
| Claims priority of application No. 2004-227018 (JP), filed on Aug. 03, 2004; and application No. 2004-368000 (JP), filed on Dec. 20, 2004. | ||
| Prior Publication US 2006/0027309 A1, Feb. 09, 2006 | ||
| Int. Cl. B29D 30/60 (2006.01) | ||
| U.S. Cl. 156—130 [156/117] | 3 Claims |
| 1. A method for forming a rubber member by overlapping and winding at least one rubber strip in a circumferential direction
and in a spiral shape,
wherein a cross sectional shape of said rubber strip is a scalene triangular shape defined by
a bottom line,
a first diagonal line extending from one end of the bottom line to a facing apex and
a second diagonal line extending between the other end of said bottom line and said facing apex and being shorter than said
first diagonal line,
a length L0 of said bottom line in the rubber strip is equal to or more than 5 mm and equal to or less than 50 mm, and
a thickness T thereof is equal to or more than 0.2 mm and equal to or less than 5.0 mm, and
a length L1 of said first diagonal line along said bottom line is set larger than 0.5 times and equal to or less than 0.8 times the length
L0 of said bottom line, wherein
said at least one rubber strip is two rubber strips which are a first rubber strip and a second rubber strip having the same
cross sectional shape,
the first rubber strip is wound from a wind start position close to one end of the rubber member to a wind end position close
to the other end of the rubber member,
the second rubber strip is wound from a wind start position close to the other end of the rubber member to a wind end position
close to the one end of the rubber member, passing each other with respect to said first rubber strip, and
in the wind start positions of the first and second rubber strips, said one end of the bottom line of each of the first and
second rubber strips is directed to an axially outer side of the rubber member.
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