Coupling element and method of making the same.

p0001The invention relates to a coupling element for connecting _Zylinderteilen, in particular for a hydraulic cylinder tube of a lift, and to a process for preparing the compound.

p0002The previously known hydraulic cylinders for elevators were produced in its entire length of a single piece. The preparation of such a long hydraulic cylinder production engineering and is limited with increasing length uneconomical. Another disadvantage of such a long cylinder is the problematic handling and the limited installation options. Furthermore, the cylinder inner wall must all under local damage_Hydrau- be substituted likzylinder. To avoid these disadvantages there is the possibility of the hydraulic cylinders of multiple cylinder parts limited length assemble. Thereby, although the above-mentioned disadvantages are eliminated, however, it has been found that when composed of individual cylinder sections hydraulic cylinders a rapid destruction of the seals of the movable piston in the cylinder occurs. This manifests itself in an extraordinary short life of these seals noticeable, which must be frequently substituted. This is not acceptable and suggest that a composition of the hydraulic cylinder from individual cylinder parts. This drawback is obviously unacceptable as inevitable and it was previously dispensed with but in itself extremely advantageous composition of the hydraulic cylinder from several cylinder parts.

p0003The invention has for its object to provide a coupling element through which individual cylinder parts to a cylinder unit of unlimited length can be connected together without the seals of the movable piston in the cylinder unit to be quickly damaged.

p0004According to the invention this object is achieved by the fact that the to be interconnected cylinder parts at their ends each have a concentric to the cylinder bore Abdreh ung that the bore coaxial with each other-defining centering is placed on The links of blunt stacked cylinder parts, and that both cylinder parts by fasteners are pulled together.

p0005By a coupling element with this invention features the cylinder parts are mounted exactly concentric to each other with their inner diameters and it has been found that while the damage to the seals of the piston is substantially reduced. It has been determined that the cause of the above prejudice in the art against the composition of the hydraulic cylinder from several cylinder parts is essentially based on that they had not yet recognized that the rapid damage to the piston seals not by the shock Telle between the cylinder parts themselves, but by the lack of precision of the concentric assembly of the cylinder components is limited. When using the inventive coupling elements, the hydraulic cylinders can be successfully assembled from individual cylinder components, as now, the coaxial mounting of the cylinder parts is ensured.

p0006In order to prevent leakage of the hydraulic fluid to the junction of two cylindrical parts, a sealing ring between the centering sleeve and the concentric sealing each cylinder portion may be provided respectively.

p0007Preferably, the contraction of the cylinder parts takes place via pressure rings with associated flanges which are pulled together via the connecting elements, as characterized in the claims 3,4 and 5,

p0008The damage of the piston seal can be reduced even further if, in accordance with claim 6, the holes of the tubular pieces are rounded at the ends to be joined together.

p0009The feature of claim 7 ensures that the replacement of a cylinder portion, the centering is fully seated on the adjacent cylindrical part.

p0010The method of joining two cylindrical parts, in particular the hydraulic cylinder of an elevator is characterized in that each cylinder portion centered on a cone and is twisted concentrically on its outer side, that wacky cylinder parts defined by a centering coaxially and subsequently contracted. In this case, the coaxial setting the cylinder parts cylinder liner one end of centering are first placed on the Abdrehung a cylinder part so that projects beyond the end of this cylindrical portion and then, the second cylinder part are plugged with his Abdrehung in the centering and pushed against the first cylinder portion.

p0011An embodiment of the inventive coupling element is shown in the accompanying drawing and will be described in more detail below. Show it:<ul><li>1, the coupling element according to the invention in axial section;</li><li>Figure 2, one end of a cylindrical portion, which centered on a cone and is provided with a Abdrehung;</li><li>Figure 3, one end of a wacky cylinder part which is provided with a pressure ring and a flange;</li><li>Figure 4, which, provided in accordance with Figure 3, with a pressure ring and a flange, turned end of the cylinder part with an additional centering is mounted on the free end of the cylinder part wacky.</li></ul>

p0012In the figure 1 the coupling element is indicated as a whole by 10. The two to be joined cylindrical parts lla and llb, in which a piston (not shown) movable have at its free end a respective Abdrehung 12a, 12b, which is performed concentrically with the internal diameter of the cylinder parts. A centering 13, the shock of the two blunt Telle stacked cylinder parts lla and llb and sets the cylinder bores fixed coaxial. Seal rings 14a and 14b are in the circumferential grooves of Zen trier bush 13 arranged and prevent leakage of the hydraulic fluid between the Abdrehungen 12a, 12b of the cylinder parts lla, llb and the inside of the centering 13. To tighten the two cylinder parts lla, llb are connecting elements 15 are provided which consist in the illustrated embodiment, a plurality of bolts and nuts. lla on each cylinder portion, llb are pressure rings 16a, 16b inserted in grooves 17a, 17b, which are provided on the Abdrehungen 12a, 12b. Flanges 18a, 18b are located on the free ends of the cylinder parts lla, llb opposite sides of the pressure rings 16a and 16b. The flanges 18a, 18b have a plurality of circumferentially distributed and aligned holes 19a, 19b in which the screws are inserted. When tightening the screw the flanges insert 18a, 18b firmly against the pressure rings 17a and 17b and pull lla cylinder parts, IIb thus firmly together. It remains the precise coaxial alignment of the_Innenbohr-nts of the cylinder parts lla and llb obtained. It can also be used other fasteners, such as like a screw with Ueberwurfmutter, or.

p0013The method for connecting the two cylinder parts will now be more fully with reference to Figures 2, 3 and 4. FIG. described.

p0014First, one end of the cylinder part, zBllb is on a cone _K centered and the outside of this cylindrical portion is concentrically turned to his inner diameter over a length at least the length of the centering (13) corresponds to (Figure 2). It can be inserted 17b for the pressure ring 16b at the same groove. Subsequently, the ending is another cylinder portion lla centered in the same manner on the cone K and processed.

p0015Thereafter, a flange 18a, 18b, lla on each cylinder portion, or pushed llb, and a pressure ring 16a, 16b inserted in each groove 17a and 17b, respectively, as shown in FIG. 3

p0016Finally, in accordance with Figure 4, the centering 13 postponed IIb with the seal rings 14a and 14b on one end of a cylindrical part, for example, so that a protruding end of this socket with the end of the cylinder part. _Anschliessend the end of the other cylinder part lla, dashed lines in Figure 4 is shown inserted into the centering 13 and against that of the first cylinder portion (llb) pushed.

p0017The two cylinder parts are now exactly coaxially with each mounted with their inner diameters and the connection can be completed by inserting the bolts and the nuts are tightened, the flanges 18a, 18b lie against the pressure rings 16a and 16b, and accordingly, the cylinder parts lla, llb contract ,

p0018To replace a cylinder part, for example, the connecting elements lla dissolved 15, the thrust collar 17b and the flange 18b are removed and the centering 13 is completely pushed llb on the cylinder part. After also the other end of the cylinder to be replaced part was solved, it can easily be laterally removed and replaced with a new cylinder part. Thereafter, the centering sleeve 13 is pushed back over the joint Telle and the connecting members 15 are attached again.