JPS61135802A - Separate tube - Google Patents

Abstract

PURPOSE:To facilitate an operation such as a puncture mending, according to a method wherein both ends of a tube are sealed at an individual air tight surface to make the tube to be a discontinuous, and the non-uniform of tire pressure or the like in the discontinuous portion is reduced, in the tuber for a tire. CONSTITUTION:A conventional doughnut type tube is cut to form a discontinuous tube wherein the shape of the section of the each tube end is equal to the section of a tire and the each section of the tube is sealed 1 by a flexible material, a ring 3 for equalizing tube inside pressure is inserted between both ends 1, 1 or both edges 1, 1 are covered by an equivalent member to equalize tire pressure. The pressure equalizing ring 3 is like a devil's tongue, which is light and has a very small stress against deformation, suitable elasticity, incompressibility, and durability. According to the above constitution, a puncture mending operation or the like can be performed without removing the tire.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field This invention relates to a tube for a wheel tire.

(B) Prior Art Conventionally, tire tubes have been continuous, and when the tube of a bicycle or motorcycle needs to be replaced due to a puncture, it is necessary to remove the wheel, which is a complicated process. Also, when repairing by patching the tube, it was difficult to do because the tube had to protrude from the tire without removing the wheel.

(C) Problems to be Solved by the Invention In order to eliminate this drawback, the present invention makes it possible to easily remove and install the tube completely without cutting the tube and removing the wheel, and improves the distribution of pressure on the tire. The aim is to make the technology and safety equivalent to or better than conventional ones.

(D) Means to solve the problem Cut the conventional donut-shaped tube as shown in Figures 1 and 2, and make the openings on both sides with the same material as the tube, or with a soft and strong material that is elastic and easy to stretch. The airtight surface (1) is made of a suitable material and has the same shape as the internal cross section of the tire.When using the former as the airtight surface, if necessary, place a pressure equalizing ring (3) for the tube at the joint of both airtight surfaces. ) or separately coat both airtight surfaces with a material of the same quality as (3) to an appropriate thickness to more completely equalize the pressure on the tire.

The material of this equalizing ring is, for example, konjac, which is light and has very little stress against deformation, has appropriate elasticity and non-compressibility, and is durable.

(a) Since the tube is divided, by passing the axle, chino, and other accessories through the gaps, the tube can be easily completely removed and installed without removing the wheel.

(b) Even when only the above-mentioned easily stretchable material is used as the airtight surface, the non-uniformity of pressure on the tire at the airtight surface portion becomes negligible. This can be concluded from the experimental results and from the fact that the pressure (5) is equal and perpendicular to the plane everywhere as shown in Figure 3.

(c) If the tube is untwisted and placed inside the tire, the two airtight surfaces (1) will be
Crimp automatically in the normal relationship position.

(d) When the tube of the present invention, which uses only the above-mentioned easily stretchable material as an airtight surface, is installed and normal air pressure is applied, if the tube size is small compared to the internal volume of the tire or the tire is thin, Due to the tension on the airtight surface, a slight dent may occur in the outer tire with a small width.

This is not noticeable unless you look carefully, and there is no problem with driving. However, as shown in Figure 4, by inserting the tube pressure equalization ring (3) between the two airtight surfaces, uneven pressure on the tire can be almost completely eliminated, and the pressure on the tire is uniform. As in case (b), it is clear from Pascal's principle or Figure 4 that this is the case.

(E) When a tire goes flat while driving, the relative movement between the rim and tire may cause the tube to become unevenly distributed as shown in Figure 6, causing it to bounce and become dangerous.

This can be prevented by providing the airtight surface (1) of the tube as close to the air inlet (2) as possible, as shown in FIG.

Note that this also facilitates the attachment and detachment of the tube.

(f) In addition, if the airtight surface (1) is cut diagonally as shown in Figure 2, the denting of the tire in the radial direction due to the tension on the airtight surface will be reduced.

(F) Example (A) The tube of the present invention cut vertically without the tube pressure equalization ring (3) is being used in the 3.00-17 motorcycle tube, but it appears that there is a dent near the airtight surface of the tire. I don't know. The airtight surface uses a large rubber plate for patching, and the airtight surface on the rim side is partially reinforced with two rubber plates stacked on top of each other. I am currently running about 11,000K with no difference from the normal tube when running. In this case, if you carry a tire lever and an air pump, in the event of a puncture, you can completely repair the puncture in about 5 minutes by replacing the spare tube of the present invention.

Moreover, even punctures such as those caused by a tube leak can be reliably repaired.

(b) For bicycle tubes, if the tube is cut vertically and there is no pressure equalizing ring (3), the width of the tire on the outside of the airtight surface is 2
A dent with a depth of about 0.3 mm occurs, but this does not pose any practical problem. This dent could also be completely removed by inserting a pressure equalizing ring (3) for the tube.

(1) The airtight surface (1) of the tube is provided at a distance of <5 cm to 10 cm from the air inlet (2).

(G) Effects of the Invention Since the tube can be easily removed and installed without removing the wheel, replacement of the tube in the event of a puncture or repair by patching can be done quickly and easily. Moreover, there is virtually no unevenness in the pressure on the tire at discontinuous sections of the tube;
It can be removed with a pressure equalization ring. It takes about 5 minutes to repair a puncture by replacing the tube of the present invention, so if you set this tube with a tire lever and a portable air pump or gas cylinder, you can repair a two-wheeled vehicle. Figure 2 shows the plan view and side view of the diagonal cut of the present invention, and the shape of the airtight surface. Figure 3 shows the pressure distribution of the airtight surface attachment without a pressure equalizing ring for tubes of the present invention. Figure 4 shows the pressure equalizing ring for tubes according to the present invention and its pressure distribution. Figure 5 shows a plan view and side view of the pressure equalizing ring for tubes. Figure 6 shows the state of the conventional tube in the event of a puncture. The figure is a diagram of the state of the tube of the present invention in the event of a puncture.

Claims (1)

[Claims] 1. A conventional donut-shaped tube is cut and the openings on both sides are closed with airtight surfaces (1), and the uneven pressure on the tire at the discontinuous portion is reduced. A tire tube 2 configured to reduce the pressure. A tire tube 3 according to claim 1, in which the airtight surface is made of an elastic, easily stretchable, and durable material. A pressure equalizing ring for the tube (between both airtight surfaces) 3) or the first claim accompanied by a function having an alternative function.
Tire tubes listed in section