Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1997-10-23
1999-05-04
Knable, Geoffrey L.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156119, 156122, B29D 2324
Patent
active
059000880
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process for producing a tire tube having a sealant contained therein and including an air chamber filled with air and a sealant chamber filled with a sealant.
BACKGROUND ART
In a usual tube-incorporated tire, if a tube gets a punctured wound caused by a nail or the like, air in the tube is leaked from the punctured wound through a small clearance between the tire and the tube and via a nipple bore in the rim to the outside and, the tire becomes flat.
Therefore, there is a conventionally known tube-incorporated tire including a liquid sealant which is previously injected in an appropriate amount for automatic emergence repairing of a puncture when the tube is punctured (see Japanese Patent Application Laid-open No. 58-74342).
In the above known tire, however, a capsule filled with the sealant is incorporated into the tube in forming the tube, and after the formation, the capsule is broken to charge the sealant into the tube. For this reason, when an external force is applied to break the capsule, not only the tube is prone to be damaged, but also the sealant may clog an air valve of the tube, and may clog a pressure gauge when an air pressure within the tube is measured.
To solve this problem, the inside of the tube may be divided into an air chamber filled with air, and a sealant chamber filled with the sealant, and the sealant may be charged directly into the sealant chamber without use of a capsule.
DISCLOSURE OF THE INVENTION
Accordingly, it is an object of the present invention to provide aprocess for efficiently producing a sealant-contained tire tube including an air chamber and a sealant chamber.
To achieve the above object, according to the present invention, there is provided a process for producing a sealant-contained tire tube including an air chamber filled with air and a sealant chamber filled with a sealant, the process comprising: a first step of extruding a tube blank including a peripheral wall of a circular section in which an air chamber and a sealant chamber are defined by a partition wall; a second step of bonding the tube blank at its opposite ends into an annular shape; a third step of forming a sealant charging bore in a peripheral wall of the tube blank to communicate with the sealant chamber; a fourth step of charging the sealant into the sealant chamber through the sealant charging bore in a state in which air has been charged into the air chamber; and a fifth the closing step of sealant charging bore formed in the peripheral wall.
With the above process, the tube blank including the air chamber and the sealant chamber defined by dividing the inside of the peripheral wall having the circular section is formed by extrusion, and the sealant is charged into the sealant chamber. Thereafter, the sealant charging bore is closed. Therefore, the air chamber and the sealant chamber can be reliably separated from each other, while preventing a damage of the tube, and the sealant can be prevented from clogging an air valve and from being leaked. In addition, since the sealant is charged into the sealant chamber through the sealant charging bore in the state in which the air has been charged into the air chamber, the air can be expelled from the sealant chamber prior to the charging of the sealant to avoid the mixing of the sealant with the air.
If the air is charged into the air chamber through an air valve mounted in the peripheral wall at the fourth step, the need for provision of a special air-charging bore in the peripheral wall can be eliminated, leading to a reduced number of fabricating steps.
If a raw rubber sheet is affixed to the sealant charging bore and vulcanized to close the sealant charging bore, the sealant charging bore can be reliably closed to prevent the leakage of the sealant.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 to 8 illustrate an embodiment of the present invention; wherein
FIG. 1 is a cross-sectional view of a wheel on which a tube-incorporated tire is mounted;
FIG. 2 shows tube-producing steps;
REFERENCES:
patent: 719425 (1903-02-01), Blodgett
patent: 1427277 (1922-08-01), Fetter
patent: 1689907 (1928-10-01), Allen
patent: 2782829 (1957-02-01), Peterson et al.
patent: 4228839 (1980-10-01), Bohm et al.
patent: 4388261 (1983-06-01), Codispoti et al.
Honda Giken Kogyo Kabushiki Kaisha
Knable Geoffrey L.
LandOfFree
Process for producing sealant-contained tire tube does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for producing sealant-contained tire tube, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing sealant-contained tire tube will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1867801