FI81897C - FAESTMUFF FOERSEDD MED SPAENNSKRUV. - Google Patents

Description

1 81897

The invention relates to a pipe fastening sleeve consisting of a rubber-elastic sealing ring having at least one radially inwardly projecting thickening at each end, and a radially inwardly bent, tension-shaped tension ring 10 surrounding the sealing ring. opposite clamping plates through which a centrally arranged clamping screw is inserted.

Such a fastening sleeve is known from DE-A-1,923,950. This fastening sleeve is provided with guide pins on both sides of the central clamping screw, which keep the clamping plates parallel to each other and thus prevent the clamping plates from tilting when tightening the clamping screw, so that the frictional forces acting on the screw are kept to a minimum. Admittedly, the guide pin and the through-holes have a longitudinal cross-section in the axial direction of the fastening sleeve in order to allow the tension plates to tilt relative to each other in the axial direction, which always occurs when the pipes to be joined by the fastening screw have different diameters. Strict parallel control of the clamping plates would then • prevent the smaller diameter pipe from being properly sealed. Arranging the longitudinal holes for the guide pins, on the other hand, improves their effect to a decisive extent, so that in the very common case that the pipes to be connected have different diameters, a strong locking of the clamping screw results in overloading and tightening of the clamping screw. compromised.

35 The above-mentioned difficulties occur to a lesser extent in fastening sleeves in which two clamping screws arranged close to the edges of the fastening sleeve pass through the clamping plates, which can be tightened alternately and 2 81897, thus ensuring a proper seal on each edge of the fastening sleeve. The frictional forces acting on the individual tightening screws are then also not so great as to seriously prevent a proper tightening. On the other hand, arranging two clamping screws instead of one not only incurs additional costs in the manufacture, but also causes an increased need for work when installing such a fastening sleeve. In addition, it requires greater skill to tighten two one-to-10 direction screws alternately evenly than to tighten just one key screw.

Accordingly, it is an object of the invention to further develop a fastening sleeve of the above-mentioned type so that, despite the use of only one clamping screw, there are no frictional forces which prevent tightening of this screw and in particular impede the desired uniform seal at both edges of the fastening sleeve.

The invention is characterized by what is set forth in the characterizing part of claim 1.

Thus, in the fastening sleeve according to the invention, non-chalked frictional forces are not kept away from the clamping screw so that the clamping plates are forced to be parallel to each other, which cannot generally be achieved in a desirable manner, but rather to ensure that the clamping plate is not skewed. bending forces which result in impermissible frictional forces between the clamping screw and the clamping screw receiving bores. The Fikem-50 mink forms spacers between the screw and the clamping plates, which allows the clamping screws to take an oblique position with respect to the clamping plates, without. that a tilt is created between the clamping screw and its bearing bores and without impeding the transmission of the clamping forces from the clamping screw to the clamping plates and thus to the clamping ring. Thus, conversely, the tension plates are free; the shirt to be inclined, in particular with respect to the axis of the clamping plate, as necessary to achieve

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f \ A r * r * r-> 3 81897 sealing on both edges of the sealing ring with inwardly directed thickenings. In this case, substantially the same tightening forces are forced on both edges of the sealing ring, because the tightening ring is free to settle automatically in the equilibrium position, where the tightening forces acting on its edges are equal. Thus, the invention provides a fastening sleeve which, due to the presence of only one clamping screw, is very cheap to manufacture and handle and further guarantees an optimal sealing of the interconnecting pipes, and this is precisely when these pipes have different diameters, as is currently the case with considerably large tolerances. with interconnected cement pipes.

The spacers can be pivotally mounted with respect to the ki-15 cross slabs in different ways. A very advantageous bearing method is formed if the spacers are in each case on the cylindrical surface against the outer side of the adjacent clamping plate. This saves extra bearing equipment. At the same time, such a device is very durable.

The spacers can simply be provided with through-holes and can be arranged between the screw head and the clamping plate on the one hand and between the nut and the clamping plate arranged on the screw on the other hand. It is also possible that the intermediate piece 25 arranged at the end of the tightening screw is formed directly as a nut for the tightening screw. for.

Notwithstanding the fact that the spacer has a cylindrical surface facing the adjacent clamping plate, i.e. it must be convex from the sieve facing the clamping plate, the shape of the spacer is arbitrary and can therefore be chosen taking into account the very appropriate manufacture. Thus, the spacer can have a cylindrical cross-section, because then a rod material can be used for the production of the spacers, on which 55 not even a cylindrical surface needs to be made. Such a cylindrical shape also offers the possibility that the spacer is formed as a tubular bending part, the wall of which is provided with through-through or threaded holes which are radially opposite to one another. Such holes can then be placed or prefabricated in a flat strip of material before the strip of material is possibly completely automatically bent into a tubular spacer.

In a preferred embodiment of the invention, the spacers 1a have a semi-cylindrical cross-section so that they can be made very simply and with minimal material consumption from a flat strip of material and also have the special advantage of providing a tightening screw for the base and possibly a tightening screw at one end. In this case, the tightening screw can co-operate, in particular with a screw nut which, at its straight edge part, has a protrusion 15 made on the flat abutment surface 15 of the spacer. For this purpose, it is very advantageous if the screw nut has a square shape when viewed from above.

As stated above, the arrangement of the pivoting spacers is intended to allow the clamping screws to be inclined with respect to the clamping plates. As a result, the through holes for the clamping screws arranged in the clamping plates must be considerably larger in diameter than the clamping screw itself, or they can advantageously be formed as longitudinal holes extending parallel to the clamping ring, so that the clamping ·. The clamping screws on the 25 plates do not have a mounting sleeve · '. in the axial direction no significant control. Thus, in order to avoid the difficulties caused, a preferred embodiment of the invention shows that the spacers are fastened between the lateral abutments made on the clamping plates.

This ensures that the spacers and the clamping screws with them are fastened in the correct position with respect to the center of the clamping plates, which is advantageous both for the handling of the fastening sleeve according to the invention and for its operational reliability. These abutments can be formed in a very simple manner by arranging strips on the outer edges of the tensioning plates and bending them in a U-shape so that: the branches formed from these strips extend in abutment next to the spacers.

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In addition, the spacers can also be fastened radially with respect to the fastening sleeve between the clamping ring and the stop arranged on the outer edge of the adjacent clamping plate. In the same way as the lateral abutments, the upper abutment 5 can also be formed from a strip starting from the outer edge of the tensioning plate and gripping around the adjacent spacer.

In order to form tension plates with abutments for spacers, it is advantageous if the tension plates are formed from the bent ends of rigid plate parts attached to the tension ring. Such sheet parts can then be made in a simple manner as stamping parts from a material whose rigidity is high enough to meet the set strength requirements. The Folded Strips treated with the above-15 then provide such a bending part with considerable rigidity even if it is still made of a relatively thin material. However, the plate parts are made of a much stronger material than the clamping ring, which must be flexible enough to fit well enough against the circumference of the elastic sealing ring.

According to a further development of the invention, such a plate part "2 may have a notch in the part facing its clamping ring extending up to the clamping plate, to which the adjacent end of the spacer engages. Thus additional control of the spacer is provided from the end adjacent to its clamping ring. from this end, the clamping forces are transmitted immediately to the edge of the clamping plate adjacent to the clamping ring, where they 50 act immediately in the clamping direction, without any tilting morents occurring, thus further improving the operation of the fastening sleeve according to the invention.

The connection between the plate parts and the clamping ring can take place by conventional methods, in particular by riveting or welding. It has proved very advantageous to fasten the plate parts to the clamping ring by means of so-called: compression-seam joints, which have a particularly good shear strength and which can be manufactured with simple tools. In particular, the manufacture of a press-fit joint does not result in any structural changes in the raw material, which could impair the longevity of the joint, which is to be feared in welded joints. The compression seam technique 5 is described, for example, in Walter Eckold GmbH & Co. KG, 3424 St, Andreasberg, brochures 383 / D and 384 / D.

Arranging the plate parts in the clamping ring has the additional advantage that it offers the possibility of arranging one of the plate parts at a distance from the end of the clamping ring, so that the part of the clamping ring extending over the plate part can form a bridge overlapping the other end of the clamping ring. In such fastening sleeves, the general arrangement of a special bridge is avoided by this measure. In addition, it is more advantageous for the tightening operation if the clamping ring 15 itself is formed from an unbroken strip of material, if its entire length can have folded edges downwards, so that the sealing ring is securely fastened between these edges and the sealing ring and the clamping ring can always be treated as one. .

The invention will be described in more detail below with reference to an exemplary embodiment shown in the drawing. In other embodiments of the invention, the features set forth in the description and the drawing may be used singly or in several arbitrary combinations.

Figure 1 shows a side view of a first embodiment of a fastening sleeve according to the invention.

Fig. 2 shows a front view of the embodiment of Fig. 1, Fig. 3 shows a plan view of the embodiment of Fig. 1.

Figure 4 shows on a larger scale a cross-section of the spacer used in the embodiment of Figures 1-3.

Figure 5 shows a side view of another embodiment of a fastening caliper according to the invention.

Fig. 6 shows a front view of the embodiment according to Fig. 5.

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Fig. 7 shows a section through the embodiment of Fig. 5 along the line VII-VII.

Fig. 8 shows a cross-section corresponding to Fig. 4 through the spacer-5 piece used in the embodiment according to Figs. 5-7.

The fixing sleeve shown in the drawing consists of a rubber-elastic sealing ring 1 and a circular strip-shaped tensioning ring 2 surrounding the sealing ring, on the outer side of which two plate portions 3,4 are attached, the ends facing each other are folded and spaced 5 apart. These clamping plates are pierced by a central clamping screw 6, which supports its base 7 by means of a spacer 8 and at its other end 15 by means of a nut-shaped spacer 9 against said outer side of the clamping plate 5. The spacers 8,9 have, as can be seen in particular from Figure 4, a cylindrical cross-section and are formed as tubular bending parts in the embodiment shown. The spacer 9 shown in Fig. 4 has threaded bores 10 in the walls corresponding to the thread of the clamping screw 6, while the spacer 8 against which the clamping screw rests on its base 7 has through-holes for the clamping screw 6. By forming the spacers 8,9 into tubular bending parts, it is possible to make the holes for the production of threaded and through-holes: the holes are punched into a flat strip of material, after which the strip of material is bent into the cylindrical shape shown in Fig. 4. Thus, the manufacture of spacers can be greatly simplified and reduced.

The ends of the rigid plate portions 3,4 fixed on the clamping ring are folded again at the parts forming the clamping plate 5 and once more from the region of the central part and twice from the area of the associated parts, so that strips 11 protrude from the clamping plates 5. 8.9 over the ends and in this way form responses for the spacers. The parts adjacent to the strips 11 are bent in a U-shape so that the arms 12 s 81897 of these parts are arranged on the sides next to the spacers 8.9 and form lateral responses to these spacers. In addition, in each of the plate portions 5.4 against the clamping ring, a notch 13 is arranged, the free width 5 of which is equal to the width of the spacers 8.9 and which extends up to said clamping plate. The spacers 8,9 engage these notches 13 and thus receive additional lateral guidance. In addition, these notches ensure that the spacers extend up to the upper surface 10 of the clamping ring and transmit the clamping forces up to the area of the bending point, so that the forces causing the bending of the clamping plates 5 are largely avoided.

The plate parts 3,4 are made of a sufficiently rigid material so that the forces caused by the clamping screw 6 on the clamping plates 5 can be properly transferred to the clamping ring 2. The connection of the plate parts 4.3 to the clamping ring 2 is served by , are simultaneously punched through the openings of the tension ring and are pushed into the back of the tension ring. This type of joint offers the advantage that it can be manufactured simply, it has a particularly high shear strength and does not cause any material changes, which could impair the loadability of the materials.

:: Of both plate portions 3 and 4, a second plate portion 3 is attached immediately to the end of the tension ring 2, while a tension ring portion 15 protrudes over the second plate portion 4 and extends below the other end of the tension ring 2 and thus forms a bridge enclosing the tension ring. In the area between the two clamping plates 5, the edges 16 of the clamping ring 2 are folded inwards and form walls adhering over the end faces of the sealing ring 1.

The fastening sleeve described is intended for connecting pipes, in particular cast iron and asbestos cement pipes.

These tubes with the same nirel diameter can have significant diameter differences that are still within your allowable tolerance range. The fastening sleeves according to the invention, tallow 9 81897, formulate the equalization of all permissible tolerances. After the fastening sleeve has been placed on top of the pipe ends or the pipe ends have been fitted inside the fastening sleeve, where the sealing ring and the clamping ring form a single 5-ring clamping ring due to the radially inwardly folded edge 16, it is sufficient to tighten the tightening screw 6. By means of the central tightening screw 6, the diameter of the fastening sleeve is first reduced until the sealing ring 10 comes into contact with a pipe of larger diameter.

The sealing ring has an inwardly puncturing thickening at its edges in a manner not shown in more detail, so that the contact of the sealing ring in each case takes place at its outer edges. Further tightening of the clamping screw 6 further reduces the diameter of the fastening sleeve 15 in the region of the central part, while the diameter of the fastening sleeve at the edge where the thickening of the sealing ring has come into contact with the larger diameter pipe remains unchanged. Thus, a conical deformation of the mounting sleeve occurs, which ends when the sealing-20 ring comes with a thickening arranged at one end. in contact with a smaller diameter pipe.

Thereafter, there is a steady increase in the clamping pressure at both edges of the sealing ring, as a result of which a proper sealing of both pipes is guaranteed.

For this event, it is important not to prevent the conical deformation of the clamping sleeve, where the clamping plates 5 assume an oblique position with respect to each other with respect to the axial direction of the fastening sleeve. It also involves placing the clamping plates 5 obliquely with respect to the clamping screw, which can take place without hindrance, since the clamping screw 6 supports the clamping plates 5 against the spacers 8,9 which deflect. in turn, they are each against the clamping plates 5 on a cylindrical surface which forms a pivot axis directed radially with respect to the fastening sleeve. As a result, the clamping plates 5 can rotate freely with respect to the clamping screw 6 and thus also with respect to each other, so that they can take up a completely oblique position in which the clamping forces applied to the edges of the sealing ring are substantially equal.

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In this way, a perfect pipe connection is produced in all respects.

It is very advantageous that, due to the use of only one clamping screw, both the structure of the fastening sleeve and its handling are very simple. In particular, it is not necessary to tighten the two parallel tightening screws alternately, which requires increased work input and also substantially. more skill than tightening a single key tightening screw. In this case, the control of the spacers 10 against the clamping plates 5 ensures that the clamping forces always have a perfect, central effect.

Another embodiment of the invention, shown in Figures 5-7, in turn consists of a rubber-elastic sealing ring 21 and a tension ring 22, 15 surrounding the sealing ring, against the outer side of which two plate parts 23, 24 are fastened, which in turn have tensioning plates 25. The bending point between the points of the tension plates 25 and the plate parts 23, 24 fixed to the outside of the tension ring 2 is stiffened by means of grooves 41.

The clamping plates 25 are provided with longitudinal holes 42 parallel to the shaft of the fastening sleeve, through which a generally centrally arranged clamping screw 26 extends. The spacers 28 are in this case formed of semi-cylindrical bending parts, each of which has a blind hole 29 for the clamping screw 26. They each have a flat abutment surface 30 for the base 27 or nut 43 of the clamping screw 26, which is a square nut at its lower edge against projections 44 arranged against the lower edges of the abutment surface 30 30 formed in the spacer 28. The advantage of using hollow cylindrical spacers is mainly that they can be: manufactured very simply with minimal material requirements and allow the use of a cheap nut which is secured against rotation 35 when protruding against the projections 44 and therefore does not need to be held in place when mounting the fastening sleeves. .

The spacers 28 are in turn fixed between the folded edge portions 31,32 of the plate portions 23,24, so that

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11 81897, notwithstanding the longitudinal holes 42 in the clamping plates 25 allowing the clamping screws 26 to be inclined, they are fastened to the center of the clamping plates.

The tension ring 22 sa of the embodiment according to Figures 5-8 has the further feature of having an inwardly folded edge along its entire length. In the tension ring portion 35 piercing the second plate portion 24, the distance between the folded edges is reduced so much that this portion fits between the folded edges at the other end 36 of the tension ring. In this way, it is guaranteed that the sealing ring 21 is trapped between the folded edges along its entire circumference and therefore cannot move to the side.

It is clear that the invention is not limited to the embodiment shown, but deviations from it are possible without departing from the scope of the invention. Thus, it is not necessary for the tension ring to have radially inwardly folded edges, although the use of such edges offers considerable advantages. In addition, the spacers need not be tubular or shell-like, but may be formed from a different type of full material, including plastic. For example, it would be possible to provide a tap-bearing for the spacers. Finally, there are also several possibilities for positioning the clamping pieces. All that matters is that the spacers are pivotally supported against the clamping plates and thus guide the clamping screw so that it is not necessary at all · it is necessary to arrange the tightening of the clamping screw against the clamping plates.

Claims (16)

1. Tightening sleeve for pipes, which is constituted by a rubber-elastic sealing ring (1; 21), at both ends of which there is at least one radially extending thickness, and of a disc strip-shaped sealing ring (2; 22) bent to a circular shape (2; 22), to the ends of which have been arranged radially outstretched towards each other clamping ears (5; 25), through which has been stuck a centrally arranged clamping screw (6; 26), which for its part rests on the clamping ears (5; 25) by the intermediate parts (8,9 28), characterized in that the intermediate bearings (8,9; 28) lie in each case on the cylinder surface, which, with regard to the clamping sleeve, has a substantially radially directed axis, towards the outer side of the adjacent clamping ear (5; 25), whereby the intermediate parts are rotatable around the shoulder. Tightening sleeve according to claim 1, characterized in that the intermediate part (9) arranged in the end part (9) of the clamping screw (6) is formed directly into a nut for the clamping screw (6). 3 · Clamping sleeve according to claim 1 or 2, characterized in that the intermediate parts (8,9) have a cylindrical *: cross-section. Clamping sleeve according to claim 1 or 2, characterized in that the intermediate parts (28) have a semi-cylindrical cross section and an even locking surface (30) for the stem (27) of the clamping screw (26) and possibly for the screw nut. (43) located at the other end of the clamping screw. · Clamping sleeve according to claim 3 or k, characterized in that the intermediate parts (8,9; 28) are formed 16 81 897 by tubular bending parts, the walls of which have been arranged radially against each other through passage or screw heels (10; 29) · Tensioning sleeve according to claim characterized in that the tightening screw (26) cooperates with the screw nut (43), which with a linear edge part is towards the protruding part (44) of the even locking surface (30). Tensioning sleeve according to claim 6, characterized in that the screw nut (43) has seen from above a square shape. Clamping sleeve according to any of the preceding claims, characterized in that the intermediate parts (8,9; 28) are fixed in the clamping ears (5; 25) between the laterally positioned latches. Tensioning sleeve according to claim 8, characterized in that strips (12; 32) arranged along the outer edges of the tensioning ears (5; 25) are curved into U-shape, the branches (12; 32) arranged next to the intermediate parts (8; 28). ) forms side locks. »·» · »· ·; 10. Clamping sleeve according to any of the preceding claims, characterized in that the intermediate parts (8,9; 28), ·. are fixed radially in relation to the clamping sleeve between the latch (11; 3D arranged at the outer edge of the clamping ring (2; 22) and the adjacent clamping ear (5; 25)). 11. Clamping sleeve according to claim 10, characterized in that the outer edges of the clamping ears (5; 25) comprise the adjacent intermediate parts (8,9; 28) which block grooving strips (11; 31). > ·· «11 17 S1897 Tensioning sleeve according to any of the preceding claims, characterized in that the passage heels arranged for the tensioning screws for the tensioning ears (25) have been formed to longitudinally extending, with the tensioning screw (42) parallel heels. Clamping sleeve according to any of the preceding claims, characterized in that the clamping ears (2; 25) are formed by the bent ends of the rigid ring parts (3,4; 23,24) fixed to the clamping ring (2; 22). Tensioning sleeve according to claim 13, characterized in that stiffening hazards (41) are provided in the area formed by the winkein between the clamping ears (25) and the disc parts (23,24) attached to the clamping straps (22). · Clamping sleeve according to claims 13 or 14, characterized in that in the disc parts (3,4) there is in the area of their clamping rings (2) a cutting (13) which extends to the respective clamping ears (5) into which the end of the spacer attaches. Tensioning sleeve according to any of claims 13-15, characterized in -; characterized in that the disc parts (3,4) have been attached: select the tension ring (2) by means of a compression seam (14). 17. A clamping sleeve according to any of claims 13-16, characterized in that one of the disc parts (4; 24) is arranged at a distance from the end of the tensioning member and the tensioning part (15] 35) which extends across the disc part (4; 24 ) forms a second overlapping bridge of a clamping screw.