P/00/0 Il Regulation 3.2 AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT ORIGINAL TO BE COMPLETED BY APPLICANT Name of Applicant: IRAUNDI, S.A. Actual Inventor: Rafael Azcarate Uribesalgo Address for Service: CALLINAN LAWRIE, 711 High Street, Kew, Victoria 3101, Australia Invention Title: BEARING INTEGRATED IN TRANSMISSION BALL AND SOCKET JOINTS The following statement is a full description of this invention, including the best method of performing it known to us:- -2 BEARING INTEGRATED IN TRANSMISSION BALL AND SOCKET JOINTS FIELD OF THE INVENTION 5 This invention concerns a bearing that is integrated in an assembly between two rotary transmission ball and socket joints between an input shaft and an output shaft each of which is installed on a side of that bearing. PRIOR ART In this field a general embodiment is known that consists of an encapsulated 10 ball bearing in the classic configuration in which the track for the rolling of the balls is established on the external face of a ring that provides interior support for the bearing and is to be mounted on the element with respect to which relative rotation is to be established. In our case the function of the bearing is to provide rotary support through 15 which the rotation is transmitted between the input and output (or drive and driven) shafts; for that purpose, there are two joints between the bearing and the shafts in the form of ball and socket junctions that connect a bearing head (which is on the bearing side) and a shaft head (which is on the shaft side in question). In the referenced general embodiment known so far, the rotary connection 20 between the bearing and the bearing heads on the sides thereof is established by using a pin fixed by a cotter pin to the internal ring of the bearing which, at its ends, also is prevented from rotating by reference to a housing on the bearing heads. Based on the foregoing, this kind of known configuration requires the use of three separate pieces. These are the pin attached to the bearing with a cotter pin, plus 25 the two bearing heads that are attached at the respective ball and socket junctions. That is, this known configuration requires certain resources and operations to perform the corresponding assembly. The reference to any prior art in this specification is not and should not be taken as an acknowledgement or any form of suggestion that the prior art forms part 30 of the common general knowledge. 05/12/1 1,15476 amended pages,2 - 2A SUMMARY OF THE INVENTION The present invention provides a transmission shaft for transmitting rotation between a drive shaft and a driven shaft, the transmission shaft including, a head located at each end of the transmission shaft, each head including a ball and socket 5 joint, one joint for connection to the drive shaft, the other joint for connection to the driven shaft, a solid core intermediate the heads, the solid core including a rolling track, and a bearing, including at least one rolling element, an outer race and an inner race for the rolling element, wherein the rolling track forms the inner race, wherein the solid core is formed seamlessly with the heads, and, wherein the solid core and 10 the bearing form a device which cannot be disassembled. In an embodiment, the invention includes a bearing integrated in transmission ball and socket joints, including an encapsulated ball, bearing and, on each side thereof, one of two 05/12/1 1,15476 amended pages,2 -3 heads, or bearing heads, which, by means of a ball and socket junction, is connected to the other head, or shaft head, for the joint formation of a transmission ball and socket joint, said bearing being mounted on a solid core with which it forms a compact device that cannot be disassembled, and that this solid core provides a 5 rolling track for the balls and, at each of the two ends, seamlessly forms the bearing heads which, through two ball and socket junctions are joined to the respective shaft heads which are joined to the corresponding shafts, the input shaft and the output shaft, between which the rotary joint is established. In accordance with the configuration proposed by this invention, the three 10 parts used in the configurations known so far have been reduced to a single part that seamlessly integrates the two side bearing heads and a solid core which includes the rolling track for the balls. Therefore the solution proposed by the invention results in savings of resources and operations, which is even more interesting because it facilitates 15 automated production of the large batches in which this kind of product is manufactured. It is appropriate to note here that the specification of a ball bearing up to this point should not be taken in a limiting manner, since said the above specification is completely valid for any other known kind of bearing (needle bearings, roller 20 bearings). DESCRIPTION OF THE DRAWINGS To better understand the nature of this invention, we represent a particular form of industrial embodiment in the attached drawings by way of illustration that is not limiting in any way. 25 Figure 1 is a perspective view of an embodiment of the invention, including an expanded detail of the area affected by the invention. Figure 2 is an orthogonal projection view corresponding to the part represented in the expanded detail included in Figure 1. Figure 2 is represented in a half section, except for a conventional section in the solid core (6) to highlight the 30 rolling track (7). Figure 3 is the upper plan view corresponding to Figure 2, but without sectioning. 30/01/06,eh 15476.spc,3 -4 The following references appear in these figures: 1. - Encapsulated ball (2) bearing 2. - Bearing (1) balls 3. - Bearing head 5 4. - Ball and socket junction 5.- Shaft head 6.- Solid core 7. - Rolling track on solid core (6) 8. - Input shaft 10 9. - Output shaft DESCRIPTION OF A PREFERRED EMBODIMENT With respect to the drawings and references listed above, the attached plans illustrate a particular manner of implementation of the invention, concerning a bearing integrated in transmission ball and socket joints, which is in accordance with 15 a general configuration including an encapsulated ball (2) bearing (1) and, on each side thereof, one of two heads, or bearing heads (3), which by means of a ball and socket junction (4) is joined with the other head, or shaft head (5), together forming a transmission ball and socket bearing. In accordance with the particular embodiment of the invention, the bearing 20 (1) is mounted on a solid core (6), with which it forms a compact device that cannot be disassembled, and this solid core (6) provides a rolling track (7) for the balls (2) and, at each of the two ends, it seamlessly forms the bearing heads (3) which, through two ball and socket junctions (4) are joined to the respective shaft heads (5) which are joined to the corresponding shafts, the input shaft (8) and the output shaft 25 (9), between which the rotary joint is established. This proposed configuration has an exterior design as illustrated in Figure 1, which can be clearly seen in the expansion diagram included therein. Regarding internal configuration, it is clearly illustrated in Figure 2 which, by using convenient sections, shows the seamless configuration of the solid core (6) and the two bearing heads (3), as well as the availability of the 30 rolling track (7) for the balls (2) (or needles, or rollers). In this way the proposed seamless part and the bearing (1) itself constitutes a compact device that cannot be disassembled which, in order to be integrated in the 30/01/06,eh I 5476.spc,4 -5 embodiment of Figure 2, only requires connection to the ball and socket junctions (4), in the same manner as has been done in embodiments known so far, but without using any bearing (1) support pin or such like, and therefore without any assembly operation or resources whatever to connect the pin to the bearing heads (3). 5 . It is apparent that the naming of the input shaft (8) and output shaft (9) is merely conventional and interchangeable, depending on the origin of the rotation; they could also be called the drive shaft and driven shaft, based on the same criterion. Where the terms "comprise", "comprises", "comprised" or "comprising" are used in this specification, they are to be interpreted as specifying the presence of the 10 stated features, integers, steps or components referred to, but not to preclude the presence or addition of one or more other feature, integer, step, component or group thereof. 30/01/06,eh 15476.spc,5