MXPA01011705A - Tubeless tire for bicycle wheel. - Google Patents

Abstract

Herein is depicted a tubeless tire for bicycle wheel which comprises a peripheral wall radially internal (2), a peripheral wall radially external (3), two circumferential lateral walls (4, 5) connecting the internal and external peripheral walls (2, 3) forming two edges (6, 7) which extend beyond the external peripheral wall (3), to fix a tubeless tire. The internal and external peripheral walls (2, 3), have two orifices (8, 9) facing each other, in which an intermediate tubular element is mounted inside (10) to which a valve body (11) of the standard type, normally used for bicycle tires with internal tubes is connected.

Description

"RIM FOR BICYCLE WHEEL WITH TIRE WITHOUT CHAMBER" DESCRIPTION OF THE INVENTION The present invention relates to rims for bicycle wheels with tubeless tires. In particular, the invention relates to a rim for bicycle wheel with tubeless tire, of the type comprising: a peripheral radially internal wall; - a peripheral radially external wall; two circumferential side walls connecting the outer wall and the inner wall, wherein the side walls extend radially outwardly beyond the outer peripheral wall, forming two edges for securing a tubeless tire; and - a valve body rigidly connected to the inner and outer walls for blowing inflation air in the chamber defined between the tire and the outer peripheral wall of the rim. For example, a rim of the type specified above is illustrated in Figure 2 of European Patent Application EP-A-0 790 141. In this known solution, the valve body is connected directly to the inner and outer peripheral walls of the tire.

REF 134053 . The purpose of the present invention is to provide a rim of the type specified above consisting of a relatively simple and inexpensive structure, which allows an easy and quick assembly operation of the tire, which guarantees perfect rigidity of the defined chamber between the tire and the tire. the outer peripheral wall of the rim, and, finally, that is capable of using a valve body of the standard type normally used for bicycle wheels with tires provided with internal chambers. In order to achieve the above purposes, the object of the present invention is a rim of the type specified at the beginning of the present description, further characterized in that the valve body is one of the standard type used in bicycle wheels with tires provided with cameras. internal, and where the valve body is connected to the inner and outer walls of the rim by means of an intermediate tubular element which is mounted inside two holes facing each other, which are formed in the internal and external walls, and having a portion projecting radially beyond the inner wall in the direction of the rim shaft, furthermore the valve body is secured to this portion.

Preferably, the valve body has an external surface with a threaded portion screwed into a threaded end portion of the inner surface of the intermediate tubular member. In a first embodiment, the intermediate tubular element has its radially outer end attached or welded to the outer peripheral wall of the rim. In greater detail, in this embodiment the intermediate tubular element is hermetically sealed to the circumferential edge of the hole in the outer peripheral wall of the rim, as well as to the circumferential edge of the hole in the inner peripheral wall. Further, preferably the radially outer end of the intermediate tubular element has a front surface that is substantially flush with the outer surface of the outer peripheral wall. In contrast, in a second embodiment, the intermediate tubular element is connected in a disconnectable manner to the rim. In a first example of the implementation of the second embodiment, the intermediate tubular element has a radially outer peripheral end portion mounted in a removable manner on a bushing having its fixed ends, preferably joined or welded, within the aforementioned orifices. facing each other from the outer peripheral wall and the Internal peripheral wall of the rim. Additionally, there are the means of fixed sealing between the intermediate tubular element and the aforementioned bushing, for example consisting of one or more O-rings that are mounted within peripheral grooves of the intermediate tubular element and make pressure contact with the inner surface of the tubular element. previously mentioned cap. In the first example already mentioned of the implementation of the second modality, the intermediate tubular element is screwed into the bushing and has an annular surface in opposition which engages the radially inner end surface of the bushing. In a second example of the implementation of the second embodiment of the invention, the intermediate tubular element has a widened head that remains on the outer surface of the outer peripheral wall of the rim and a threaded portion projecting behind the inner peripheral wall, in direction of the rim shaft, in which a nut is screwed, to pull the aforementioned head against its supporting surface. In a second example of the implementation of the second embodiment, the aforementioned bushing is not available, and the intermediate tubular element engages through the above-mentioned holes facing each other of the inner and outer peripheral walls of the rim and has an enlarged end head that remains on the external surface of the outer peripheral wall and a threaded portion that protrudes beyond the inner peripheral wall, in the direction of the rim shaft, and in which a nut is screwed to pull the head previous against its support surface. Preferably, between the head and the abutment surface are the fixed sealing means, for example, consisting of an adhesive, or of an O-ring mounted within a front annular groove 'formed in the outer surface of the outer peripheral wall. , along the edge of the respective hole. Thanks to the above characteristics, the invention produces numerous advantages. First, the valve body used in the rim according to the invention can be a standard type valve body used in tires with tires provided with internal chambers. Second, the structure of the rim is simple, economical and allows easy and quick operation of both the tire assembly and the valve body assembly. Finally, in the case of the second embodiment, in which the anterior intermediate tubular element is removably connected to the rim, the invention also allows the easy and rapid conversion of the rim to fit with a tire provided with a camera. internal In this case, in fact, it will be sufficient to remove the intermediate tubular element and assemble the inner tube with the corresponding valve body in the traditional manner, inserting the valve body through the two holes facing each other formed in the walls external and internal peripherals of the rim, as well as through the previous bushing in the examples of the modality where the latter is present. Additional features and advantages of the present invention will be seen from the following description, with reference to the accompanying drawings, only provided by way of non-limiting example, wherein: Figure 1 is a cross-sectional view of the rim of according to the invention, in a plane containing the rim axis and at the point where the valve for inflating is mounted, according to a first embodiment of the invention; - Figure 2 illustrates a first example of the second embodiment of the invention; Figures 3 and 4 illustrate two additional examples of the second embodiment. In the Figures, the corresponding parts are indicated by the same reference numbers.

In Figure 1, the reference number 1 indicates, in its entirety, a rim for bicycle wheel, comprising an inner peripheral wall 2, an outer peripheral wall 3, and two circumferential side walls 4, 5, connecting the two walls 2, 3 and extending radially outwardly forward of the wall 3 in such a way that two edges 6, 7 are formed to fix a tubeless tire (not shown). In the area where the valve for inflating the tire will be mounted, the two walls 2, 3 have two holes 8, 9 facing each other, which have a common axis in radial direction with respect to the rim axis, and in which at the edges an intermediate tubular element 10 is fixed by means of welding or other joining means. The tubular element 10 has an end face surface, oriented radially outward and indicated by the number 10a. The surface 10a is formed and fixed to the level of the outer surface 3a of the outer peripheral wall 3 of the rim. In addition, the intermediate tubular element 10 has a portion 10b, which protrudes beyond the inner peripheral wall 2 in the direction of the rim axis (not shown) and which abuts an end portion 10c having an internal thread 10d. The reference number 11 indicates a valve body (illustrated only schematically) of the standard type normally used for bicycle wheels with tires provided with internal cameras. Because it is well known, the internal structure of the valve body is not illustrated). The valve body 11 has an intermediate threaded portion 11a, which is screwed into the threaded portion 10Od of the tubular element 10. Figure 2 illustrates a second embodiment, wherein the intermediate tubular element 10 is connected in a disconnectable manner to the rim 1. In the case of the example of Figure 2, the intermediate tubular element 10 has a radially external end portion 10e, which is threaded on the outside and which is screwed into the internal threaded surface of a bushing 12, the ends of which are joined or welded by means of welding or other attachment means S within the edges of the holes 8, 9. The end portion 10e of the intermediate tubular element 10 on the other hand is provided with an O-ring 13 received in a circumferential groove of the portion 10e and which press-contacts with the inner surface of the bushing 12 to ensure rigidity and provide go the exit of the tire chamber defined between the same tire (not shown) and the outer peripheral wall 3 of the rim. In addition, the intermediate tubular element 10 has a collar 10F with an annular counter-rotating surface 10G, which is in contact with the radially inner end surface of the sleeve 12.

The embodiment illustrated in Figure 2 has a slightly more complicated structure than that of the example of Figure 1, but with the advantage that it allows easy and quick conversion of the rim into one that can be used with a tire provided with an internal camera. . In this case, in fact, it is sufficient to unscrew the intermediate tubular element 10 to remove it, after which the internal chamber of the tire can be assembled in a conventional manner, inserting the valve body associated thereto through the inner passage of the bushing 12. Figure 3 illustrates a variant of Figure 2, in which the disconnectable connection of the intermediate tubular element 10 within the bushing 12 is obtained in a different manner. In this case, in fact, the intermediate tubular element 10 has, at its radially outer end, an enlarged head 14, which remains on the external surface 3a of the outer peripheral wall 3. Additionally, the part 10b of the intermediate tubular element 10 , which protrudes beyond the inner peripheral wall 2, is threaded to allow screwing a nut 15, which has the function of securing the intermediate element 10 to the rim, by pulling the head 14 against the bearing surface 3a. In the case of the example of Figure 3, however, the intermediate tubular element 10 is provided with two O-rings 13 received in circumferential grooves. respective of the intermediate tubular element 10. Also the solution of Figure 3 obviously allows easy adaptation of the rim to a tire provided with the internal chamber. The example in Figure 4 differs from that in Figure 3 mainly due to the elimination of the bushing 12. In this case, the stiffness is ensured by a single O-ring 16 which is received in a front circumferential groove 17 formed in the surface 3a along the edge of the hole 9. The latter solution is preferred in the case of a rim made of a composite material, for example, reinforced with carbon fiber, or in the case of a rim made of a light alloy, because of the absence of welds or other joining means. Instead of the O-ring 16, any other sealing means can also be used, for example in the form of an adhesive. In addition, the head 14 can be formed to adapt to the profile of the surface 3a in a harmonious manner. From the above description it is clear that the rim according to the invention has a structure that is relatively simple and economical, while at the same time ensuring a perfect air tightness inside the tire chamber. Additionally, it allows the assembly and disassembly operations to be carried out in a simple and fast way, and, finally, it makes possible, in the case of the second embodiment previously indicated in the examples of Figures 2, 3 and 4, an easy and quick adaptation of the rim with a tire having an internal chamber. Of course, without prejudice to the principle of the invention, the details of construction and embodiments may vary widely because it is described and illustrated herein only by way of example, without thereby departing from the scope of the present invention.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects or products to which it refers.

Claims (20)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property: 1. A rim for a bicycle wheel with a tubeless tire, comprising: a peripheral radially internal wall; - a peripheral radially external wall; and - two circumferential side walls, connecting the outer wall and the inner wall, wherein the side walls extend radially outwardly beyond the outer peripheral wall, forming two edges to provide the fixation of a tubeless tire; and - a valve body rigidly connected to the inner and outer walls for blowing inflation air into the chamber defined between the tire and the outer peripheral wall of the rim, characterized in that the valve body is of the standard type used for bicycle wheels. with tires provided with internal chambers, and because the valve body is connected to the inner and outer walls of the rim by means of an intermediate tubular element, which is mounted inside two holes that face between if of the inner and outer walls and having a portion projecting radially beyond the inner wall, in the direction of the rim axis, in this portion the valve body is secured.
2. 2. The rim in accordance with the claim 1, characterized in that the valve body has an external surface with a threaded portion screwed into a threaded portion of the inner surface of the intermediate tubular element.
3. 3. The rim in accordance with the claim 2, characterized in that the threaded portion of the inner surface of the intermediate tubular element, where the valve body is screwed, is formed at the end of the intermediate tubular element.
4. 4. The rim according to any of claims 1 to 3, characterized in that the intermediate tubular element has its radially outer end joined or welded to the outer peripheral wall of the rim.
5. The rim according to claim 4, characterized in that the aforementioned external end of the intermediate tubular element is hermetically joined or welded to the circumferential edge of the respective hole in the outer peripheral wall of the rim.
6. The rim according to claim 5, characterized in that the intermediate tubular element it is also attached or welded to the inner peripheral wall of the rim.
7. The rim according to any of claims 4 to 6, characterized in that the radially outer end of the intermediate tubular element has a front surface that is substantially flush with the outer surface of the outer peripheral wall of the rim.
8. The rim according to any of claims 1 to 3, characterized in that the intermediate tubular element is connected in a disconnectable manner to the rim.
9. The rim according to claim 8, characterized in that the intermediate tubular element has a peripheral, radially external portion removably mounted on a bushing, having its fixed ends inside the holes facing each other, the external peripheral wall and the inner peripheral wall of the rim.
10. The rim according to claim 9, characterized in that the radially outer peripheral portion of the bushing is substantially flush with the outer surface of the outer peripheral wall of the rim.
11. 11. The rim according to claim 9, characterized in that the bushing is joined or welded to the circumferential edges of the holes facing each other.
12. 12. The rim according to claim 9, characterized in that between the intermediate tubular element and the bushing are fixed sealing means.
13. 13. The rim according to claim 12, characterized in that the sealing means comprise one or more o-rings.
14. The rim according to claim 13, characterized in that the ring or the O-rings are mounted in peripheral grooves of the intermediate tubular element and press-fit against the inner surface of the bushing.
15. 15. The rim according to any of claims 9 to 14, characterized in that the intermediate tubular element is screwed into the bushing.
16. The rim according to claim 15, characterized in that the intermediate tubular element has an annular surface in opposition designed to couple the radially inner end surface of the ferrule.
17. 17. The rim according to any of claims 9 to 14, characterized in that the intermediate tubular element has a widened head that remains on the outer surface of the outer peripheral wall of the rim and a threaded portion that protrudes beyond the inner peripheral wall. , in the direction of the rim shaft, where a nut is screwed, to pull the aforementioned head against its supporting surface.
18. 18. The rim according to claim 8, characterized in that the intermediate tubular element engages directly through the holes facing each other, and has a widened end head that remains on the external surface of the outer peripheral wall and a threaded portion that protrudes beyond the inner peripheral wall, in the direction of the rim shaft, and where a nut is screwed to pull the already mentioned head against its bearing surface.
19. 19. The rim according to claim 18, characterized in that the fixed sealing means are between the head and its support surface.
20. 20. The rim according to claim 19, characterized in that the sealing means comprise an O-ring mounted within a front annular groove formed in the outer surface of the rim. outer peripheral wall of the rim, along the edge of the respective hole.