JP6582176B2 - Tire tube - Google Patents

Description

The present invention relates to filter ear tube inserted between the rim and the tire.

  As a general bicycle tire, a tire that is made by inserting a rubber tire tube between a rim and a tire base and filling the tire tube with pressurized air is mainly used. However, in the case of such a tire, when a foreign object such as a nail or sharp glass is pierced, the compressed air in the tire tube is released and a so-called puncture is caused.

  For these reasons, recently, a puncture tire that does not generate punctures even if a foreign object is stuck in the tire has been proposed. For example, what is disclosed in Patent Document 1 is that this puncture tire is prepared by injecting a foamable synthetic resin into a tire tube and foaming and curing the resin to prevent tire puncture. Yes.

JP-A-8-142603

  However, the puncture tire disclosed in Patent Document 1 has the following problems because the tire tube is filled with a foaming synthetic resin instead of air. That is, in the case of the invention described in Patent Document 1, since the foamed resin is filled in the tire tube without a gap, the tire weight is increased. For this reason, a large force is particularly required at the beginning of rowing a bicycle. Also, by filling the tire tube with foamed resin without any gaps, the resilience of the tire is increased, the absorption of vibrations and shocks is reduced, and the riding comfort of the bicycle is deteriorated. In some cases, the rim may be damaged. Furthermore, filling the tire tube with the resin without any gap means that the amount of the resin filled per tire is large, which inevitably increases the cost.

Accordingly, the present invention, while achieving the task of preventing a puncture of the tire, has been an object of the present invention to provide a ride comfort of pain ear tube at a low cost.

To achieve the above object, engagement Ruta ear tube in the present invention, there is provided a tire tube that is inserted between the annular tire substrate to be mounted on an annular rim and said rim, said tire tube, elastomer the a substantially circular cylindrical body was cut into extruded and predetermined length in the hollow elongated as a raw material, to form a portion of the rim facing the cylinder wall thickness, the outer peripheral surface thereof A non-through hole in which a thin-walled portion remains on the inner peripheral side is continuously drilled at a slight interval, and further, the inside of the cylindrical body is formed in an annular shape by joining both ends in a state of normal pressure. It is said.

The present invention cuts a cylindrical body extruded into a hollow elongated shape from an elastomer as a raw material into a predetermined length and connects the both ends thereof to form an annular shape. The pressure is maintained at 1 atm, and the shape is held by the elastic force of the elastomer. For this reason, it is not necessary to fill the tire tube with pressurized air unlike a general tire. That is, even sharp foreign matter is stuck in the tire, to restore by the elasticity of the elastomer.

  Furthermore, since it is not necessary to fill the tire tube with a resin without a gap, the tire weight is not increased, and vibrations and shocks applied to the tire can be appropriately absorbed. Therefore, there is no weight at the beginning of rowing the bicycle, and the riding comfort during running is improved. Furthermore, as compared with the case where the resin is filled in the tire tube, the amount of resin filled per tire can be greatly reduced, so that the cost can be reduced at a low cost.

  In addition, since a plurality of non-through holes are formed at appropriate intervals on the circumferential surface facing the rim of the annularly formed tire tube, the manufacture thereof can be facilitated. That is, when joining both ends of a substantially circular cylindrical body cut to a predetermined length, it is necessary to bend the cylindrical body and attach the both end surfaces together. Since the plurality of non-through holes are provided, the cylindrical body can be easily bent in an annular shape, and the end faces can be easily matched with each other.

Sectional view showing a state in which tire tube and the tire base body is mounted on the rim. The perspective view of a cylinder. The perspective view of a cylinder. Sectional drawing which shows the state which fuse | melts and combines the both end surfaces of a cylinder with a hot platen. Perspective view showing a state for mounting the tire tube to the rim. Main part perspective view showing a state where the tire tube and the tire base body is mounted on the rim.

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, engages filter ear tubes to the present invention will be interposed between the rim and the tire base. Therefore, before describing the engagement filter ear tube present invention will be briefly described the rim and the tire base. Incidentally, the description for convenience, hereinafter, the tire tube to simply as "tubes".

  The said rim | limb 1 is a well-known thing used for a general bicycle, The whole is formed in the cyclic | annular form of predetermined diameter. Specifically, as shown in FIG. 1, the rim 1 has a substantially U-shaped cross section by a bottom surface portion 2 and side frame portions 3, 3 having a predetermined height rising from both side edges of the bottom surface portion 2. In addition, hooks 4 and 4 that are slightly bulged inward are formed at the tips of the side frame parts 3 and 3.

  The tire base 5 is a well-known one used for a general bicycle, and is entirely formed in an annular shape having a predetermined diameter. Specifically, as shown in FIG. 1, the tire base 5 includes a tread portion 6 in which three grooves are circulated at the top portion thereof, and sidewall portions 7 provided continuously on both sides of the tread portion 6. , 7 have a substantially horseshoe-shaped cross section, and rim fitting portions 8, 8 that are slightly bulged outward are formed at the tips of the sidewalls 7, 7.

  The tube T according to the present invention is attached to the rim 1 by partially extending the circumference by pulling outwardly, and then the tire base 5 is attached to the rim 1 so as to cover the tube T. Will be.

  The tube T is finally configured in an annular shape, but as shown in FIGS. 2 and 3, the tube T was extruded into a hollow long shape using an elastomer as a raw material. It is a rod-shaped object obtained by cutting the substantially circular cylindrical body 10 into a predetermined length. The cylindrical body 10 can be cut at an arbitrary length according to the diameter of the rim 1. For example, when the rim diameter is 26 inches, the cylindrical body 10 is cut to 1945 mm. If the rim diameter is 27 inches, cut to 2065 mm. This is because the inner diameter of the tube T is made smaller than the outer diameter of the rim 1 when both end surfaces of the rod-shaped cylinder 10 are joined to form an annular tube T. As described above, when the tube T is pulled to be smaller than the outer diameter of the rim 1 and the tube T is pulled to increase the circumference, the tube T is firmly fitted to the rim 1. It will be. Note that air of approximately 1 atm (normal pressure) is sealed inside the annular tube T.

  Further, the tube T (tubular body 10) has a slightly elliptical cross section, and when mounted on the rim 1, the rim facing portion 11 facing the bottom surface portion 2 of the rim 1 is thickened. The outer peripheral surface is a flat surface. That is, the thickness of the tube T is basically set to about 3 mm, but the rim facing portion 11 is set to about 8 mm. Furthermore, a plurality of holes 12 are formed in the rim-facing portion 11 of the tube T at a certain interval and at equal intervals on the same circumference. The holes 12 are slightly formed inside the rim-facing portion 11. It is a non-through hole that leaves a thin part. Further, the hole 12 can be selected in an arbitrary shape such as a circular hole as shown in FIG. 2 or a rectangular hole as shown in FIG. The reason why the hole 12 is a non-through hole is to prevent the air inside the tube T from escaping and to maintain the restoring property. That is, if an external force is applied to the tube T when it is a through-hole, normal pressure air inside the tube T is released and deforms, and this is avoided.

  In addition, the elastomer as a material of the tube T employ | adopts the urethane elastomer as what is in this embodiment. Of course, other elastomers can be used as long as they have elastic restoring force even when foreign matter is stuck in the tube T and have elastic force that can maintain good riding comfort.

  Next, the manufacturing method of the tube T comprised as mentioned above is demonstrated. First, the urethane elastomer heated and melted in the extruder is passed through a ring-shaped gap at the tip of the extruder and extruded as a continuous hollow long cylindrical body 10 (step 1), which is belt-type take-up. Sequentially feed in the extrusion direction by machine. At this time, the rim facing portion 11 of the cylindrical body 10 faces upward. Next, the extruded cylindrical body 10 is sized to a predetermined size in a vacuum water tank, and then cooled to about room temperature in a cooling water tank (step 2). Then, the cooled cylindrical body 10 is cut into a predetermined length by an automatic cutting machine (step 3). The cutting length differs depending on the outer diameter of the rim 1 to which the tube T is mounted, but at least the inner diameter of the annular tube T is made smaller than the outer diameter of the rim 1. Next, a plurality of cylindrical holes 12 are drilled using a multi-axis drilling machine in a rim fitting portion 11 located on the upper side of the cylindrical body 10 cut into a rod shape having a predetermined length. At this time, the hole 12 is drilled as a non-through hole in which a thin portion remains in the inner portion of the rim fitting portion 11 of the cylindrical body 10 (step 4). When the process up to step 4 is completed, the rod-shaped cylinders 10 having a predetermined length are once collected in one place. Then, while the collected cylindrical body 10 is bent manually in an annular shape, as shown in FIG. 4, both end surfaces thereof are brought into contact with the hot plate 20 to be melted by heating (step 5). When both end faces of the cylinder 10 are appropriately melted, the hot plate 20 is pulled up and the both end faces of the cylinder 10 are butted and joined (step 6). The tube T is completed by such a process.

  Of the above steps, the following advantages can be obtained by adding the step 4, that is, the step of forming the non-through hole 12 in the rim fitting portion 11 of the cylindrical body 10. Specifically, since the non-through hole 12 is formed in the cylindrical body 10 and the portion thereof is thin, the cylindrical body 10 can be easily bent by hand without applying much force. It becomes possible to match exactly. Therefore, the mechanical process by the winding drum etc. which are performed normally can be abbreviate | omitted. Moreover, since it becomes easy to match | combine an end surface correctly, not only a skilled worker but anyone can perform the said operation | work.

  Incidentally, in the above process, an example in which a multi-axis drilling machine is used as the process 4 for drilling the non-through hole 12 in the rim fitting portion 11 of the cylindrical body 10 has been shown. It is also possible to form a non-through hole by providing a pressing portion having a shape, heating the pressing portion, and pressing the pressing portion against the rim fitting portion 11 of the cylindrical body 10.

  Next, a procedure for mounting the tube T that has been made annular through the above steps to the rim 1 and mounting the tire base 5 to the rim 1 will be described. First, as shown in FIG. 5A, the tube T is fitted to a part of the rim 1. Next, the side of the tube T that is not fitted to the rim 1 is pulled outward, the circumference of the tube T is lengthened, and the tube T is fitted to the outer circumference of the rim 1 as shown in FIG. Let As a result, the tube T once having a longer circumferential length contracts again due to its elastic restoring force and is firmly attached to the rim 1. Then, this time, the tire base 5 is covered from the outside of the tube T, and the rim fitting portions 8 and 8 formed at the tips of the sidewall portions 7 and 7 are attached to the side frame portions 3 and 3 of the rim 1 with a jig or the like. 3 Push inside. As a result, the rim fitting portions 8, 8 of the tire base 5 are hooked on the hooks 4, 4 of the rim 1, and the tire base 10 is attached to the rim 1.

In the above embodiment, an example of using the engagement filters ear tube on the bicycle to the present invention, light vehicles other than bicycles, for example, a wheelchair or stroller, also be used as a tire tube, such as golf carts Is possible.

As described above, engagement filter ear tube in the present invention, this means that its shape by the elastic force of the elastomer is maintained, it is not necessary to fill the compressed air into the tire tube, also worry punk There is no need to do. Further, engagement filter ear tube in the present invention, we are possible to reduce the weight of the tire weight, moderately absorb vibration and shock applied to the tire, therefore, it is possible to improve the ride comfort.

T tire tube 1 rim 5 tire base body 10 the cylindrical body 12 blind holes

Claims (1)

A tire tube interposed between an annular rim and an annular tire base attached to the rim,
The tire tube is a substantially circular cylindrical body that is extruded into a hollow long shape using an elastomer as a raw material and cut into a predetermined length, and a portion facing the rim of the cylindrical body is formed thick. , a plurality of drilled with interval a non-through hole thin portion remains on the inner peripheral side to the outer peripheral surface thereof,
Further, the inside of the cylinder body is formed in an annular shape by joining both ends in a normal pressure state, and the atmospheric pressure air is used in a state of being sealed inside the annularly formed cylinder body. A characteristic tire tube.

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