EP2848369A2 - Press sling in particular for connecting tubular workpieces - Google Patents

Abstract

A press sling for connecting in particular tubular workpieces has a plurality of articulatedly interconnected pressing elements (10). In each case, a gap (24) is formed between adjacent pressing elements, in particular when the pressing loop is open. In particular, when closing the press sling here squeezing of the user can take place. To avoid these bruises, according to the invention, at least one of the gaps (24) is at least partially covered by a protective element (26). Furthermore, the invention preferably has rotatably arranged, a finger recess (80) having holding elements (78). These serve for better handling of the press sling.

Description

The invention relates to a press sling for connecting in particular tubular workpieces, wherein the bonding is effected in particular by pressing.

In particular, for the production of pipe joints, it is known to use sleeve-shaped press fittings. These are inserted over the two pipe ends to be connected and plastically deformed with the aid of a pressing tool. The press fittings are usually made of metal. The inner diameter of the press fitting is chosen slightly larger than the outer diameter of the pipe ends to be joined, so that due to the radial compression, the inside of the press fittings is pressed to the outside of the pipe ends and a solid, in particular tight connection is made due to the permanent deformation.

For producing the connection, in particular the pressing, pressing tools or press slings are known. For example, it is off EP 06 27 273 a multipart press sling known. This has a plurality of articulated interconnected chain-like pressing elements. The pressing elements are placed around the tubular workpieces, ie the press fitting arranged on the tube ends. At the open end of the pressing tool, ie at the closing point of the pressing tool, a drive device be set. With the aid of the drive device, a complete closing of the pressing tool takes place, in that the two end pressing elements, ie the two pressing elements, between which the closing point is located, are moved toward one another. The drive element can be connected via suitable connecting elements such as pins with the two end-pressing elements for closing the pressing tool.

Out EP 06 27 273 It is known that at least a part of the pressing elements has a pressing jaw carrier, of which one or more pressing jaws are held displaceably. The pressing jaw carrier of the individual pressing elements are hinged together. Since the press jaws are slidably held, it is possible to produce a satisfactory pressing operation with such a press sling.

For use, press loops around the components to be pressed, i. in particular be wrapped around the pipe joint and the sleeve-shaped press fitting. To avoid falling or slipping down of the press sling, press slings were developed, the individual chain-like interconnected pressing elements additionally comprise spring elements. The spring elements are arranged such that they always cause closing of the press loop around the press fitting. The opening of the press sling must therefore take place counter to the spring force. Such press slings have the significant advantage that slipping down is avoided.

The opening of the press slings is made by a user who usually moves the two end press members apart to open the press sling. Due to the enlargement of the diameter that takes place as a result, a gap results between adjacent pressing elements or the pressing jaws borne by the press carriers. A press loop opened in this way is then placed over the press fitting to close and the two end press elements are moved towards each other again, this being done automatically with spring-loaded press loops, so that the user only has to reduce the holding force. When closing press loops by a user, there is a risk that the user's skin will become trapped in the gap between pressing elements or pressing jaws which reduces in width during closing. This can lead to painful bruises, especially with spring-loaded press slings.

The object of the invention is to provide a press sling in which the risk of bruising is reduced.

The solution of this object is achieved by the features of claim 1.

Another independent object of the invention is to provide a press sling whose handling is improved by the user.

The solution of this object is achieved by the features of claim 17.

A press sling for connecting in particular tubular workpieces, in particular for crimping a press fitting for connection of two pipe ends, has a plurality of press elements connected to one another in an articulated manner. The pressing elements are thus connected in a chain-like manner and form an open pressing ring. Between adjacent pressing elements occur in particular when the press loop open column. In order to avoid trapping of the skin when closing the press sling by a user, according to the invention at least one of the gaps is at least partially covered by a protective element. In the case of a pressing loop having, for example, four or more pressing elements, it may be sufficient if only the gaps between the two first pressing elements or the end pressing element and the adjacent pressing element are covered. In this area, the user's palm is arranged when opening and closing the press sling. The gap between the other pressing elements do not necessarily have to be covered with a protective element. For safety reasons, however, it is preferred that these gaps are also at least partially covered. Furthermore, a partial covering is sufficient depending on the design of the press loops, since the occurring gaps are partially covered by other components, so that pinching is not possible.

In a preferred embodiment, the pressing elements have a pressing jaw carrier which carries one or more pressing jaws. In this case, the pressing jaws can be held displaceably on the pressing jaw carrier. The pressing jaws can also be fixedly connected to the pressing jaw carrier or formed integrally therewith. Preferably, the die jaws are hinged together to form the chain-like press loop. The articulated connection takes place here preferably via hinge pins.

It is particularly preferred that the at least one protective element is arranged on a hinge pin. This has the advantage that the protective element can be fastened in a simple manner. The attachment of the protective element is preferably carried out on that hinge pin which is assigned to the gap to be covered. Usually, the hinge pin is arranged in the radial direction substantially at the same height as the gap. The connection or holding of the protective element on a hinge pin can preferably be effected in a simple manner in that the protective element has an opening through which the hinge pin is passed. In this case, the opening may be a part-annular opening, a part-circular or circular opening. The hinge pin thus protrudes through the opening of the protective element in a preferred embodiment, wherein the protective element then in a simple manner by a locking ring or the like. can be held. In this case, in particular, the securing ring can be used, by which the hinge pin is also fixed to form the joint.

In a further preferred embodiment of the invention, an anti-rotation device is also provided to ensure that twisting or displacement of the clamping protection is avoided and the clamping protection covers the gap at least partially, in particular in each opening and closing position of the press sling.

In a preferred embodiment, a projection such as a pin is arranged on an outer side of the pressing jaw, which protrudes into a recess provided in particular in the inside of the protective element. The pin is in this case arranged offset to a possible axis of rotation of the terminal protection. As a result, an anti-rotation is realized in a simple manner. Of course, the approach may also be provided on the protective element. This then projects into a recess on the outside of the pressing jaw. Furthermore, it is preferred that the protective element has two recesses arranged symmetrically with respect to a gap center plane. This has particular assembly advantages. Such a trained protective element can cover both a left and a right side of a gap with respect to a side view of the press loop. Here, the protective element is arranged in a mirrored position and preferably connected to either the left or right end. Due to the provision of two recesses, it is possible that the pin-shaped projection, which is arranged on the pressing jaw, always protrudes into one of the two recesses. Such a configuration has the advantage that the identically configured protective element can be arranged differently and not different protective elements to cover the column must be made. As a result, in particular, the assembly is simplified. Of course, it is also possible in this preferred embodiment, in turn, that the two recesses are provided on the pressing jaws and the protective element has a neck.

Since the press loops in side view are usually formed substantially symmetrical, there are in side view respectively a right and a left part of each gap. In side view, the gap is optionally covered by the corresponding pressing jaw carrier or the joint connection between adjacent pressing jaw carriers. A gap between two adjacent press-jaw carriers is covered in a preferred embodiment by a pair of protective elements, ie a left and a right protective element. The protective elements of a protective element pair are thus arranged opposite one another and preferably of identical design.

Press loops are, for example, designed such that the width of the pressing jaw carrier in side view corresponds to the width of the pressing jaws or the pressing jaws have a smaller width, wherein the pressing jaw carrier and the pressing jaws are often formed in one piece. In this embodiment, the pressing jaws in the side view are not on the side before the pressing jaw carrier. The areas of the gaps to be covered between adjacent pressing jaws are thus the gaps occurring on the left and right end faces.

In other embodiments of press loops, the pressing jaws protrude laterally beyond the pressing jaw carriers, at least on one side. In particular, the press-jaw carriers thus have a smaller width in side view than the press jaws. The result is that in addition to the columns occurring on the front side of the gap is open in side view. Preferably, protective elements are provided in such executed press slings, which additionally cover a lateral region of the gap. Preferably, the protective elements provided for this purpose have a side element. The side element is preferably connected or integrally formed with a head element, wherein the head element covers the frontal region of the gap. The side element is in this case preferably arranged at an angle of approximately 90 ° to the head element.

In a further preferred embodiment, it is preferred that the protective element additionally has a foot element connected in particular to the side element. The foot element is used for connection with the hinge pin via an opening or the like In particular, the protective element is thus formed in side view S-shaped, wherein the head element and the foot member are each arranged substantially perpendicular to the side member and have in opposite directions.

Furthermore, it is preferred that the side element has a substantially triangular cross section, so that a part of the side element protrudes into the lateral region of the gap.

Furthermore, press loops are known in which the beads produced by the inside of the pressing jaw are arranged asymmetrically or irregularly in the longitudinal direction of a tubular element or a press fitting. Since the press fitting is preformed, it is in such irregularly arranged beads, depressions or the like. required that the press sling be placed in a correct position on the press fitting. It must be ensured that the press sling is not mirrored or rotated 180 °. This would not press the press fitting as required and lead to no required, secure press connection. In order to avoid incorrect placement of the sling on the press fitting, it is known to provide on the press sling a sheet metal element which engages in a groove on the press fitting. Only this ensures the correct arrangement of the press loop relative to the press fitting. According to the invention, in a particularly preferred embodiment, it is possible to design at least one of the protective elements provided in such a way that it protrudes into an interior of the press sling. The protruding part of the protective element is introduced into the groove of the press fitting when placing the press sling on the press fitting, so that in this way an exact arrangement of the press sling is ensured relative to the press fitting.

Even with symmetrically designed press slings or press fittings can provide a projecting into an interior protective element according to the invention be beneficial. As a result, the position of the press sling or press jaws in the longitudinal direction can be clearly defined relative to the press fitting.

In a further preferred embodiment, it is possible to customize the at least one protective element. In particular, customer customization may be performed by providing the name on the protection element, by appropriate color design of the protection element, etc. This has the advantage that press loops produced for a particular customer can be customized in a simple way for this customer. Furthermore, it is possible for the protective element, which may be made of plastic, for example, to use for information reproduction. For example. can be provided a press loop designation such as the nominal diameter, the type of press fitting, etc. This not only has the advantage that the protective element can be easily provided with such information, but also that the information is then clearly visible.

The provision of at least one, in particular a plurality of protective elements is particularly advantageous in press slings when the individual pressing elements are spring-loaded. Especially with press loops, which close automatically by spring forces, the risk of crushing without providing protection elements according to the invention is very large.

The solution to the further task of improving the handling of press slings takes place independently of the provision of at least one protective element. It is an independent invention, however, which can be combined with the provision of at least one protective element.

To improve the handling of press slings, a holding element for a user is arranged according to the invention at the two unconnected end-pressing elements to open. By providing such a retaining element on each end pressing element, a secure gripping of the two end pressing element is possible for the user. This is especially true at heavy and / or spring-loaded press loops advantageous, since in particular an exact positioning of the press sling on the press fitting is possible.

In a particularly preferred embodiment, at least a part of the holding elements has a finger recess. This makes it possible in particular to arrange the thumb or forefinger in the finger recess of the corresponding holding element. This improves the handling.

Furthermore, it is preferred that at least two holding elements are provided per end pressing element. These are arranged opposite each other in a further preferred embodiment, so that in particular in one of the holding elements of the thumb and the opposite holding element of the index finger can be arranged.

Furthermore, it is preferred that at least a part of the holding elements is rotatably connected to the pressing element. This has the advantage that when opening or closing the press sling, a rotation of the holding elements can take place and the corresponding movement is not or only to a lesser extent between the fingers of the user and the holding elements. This further improves handling and safety.

It is particularly preferred that the two opposing holding elements are connected in particular rotatably via a common bolt with the pressing element.

The pressing elements, as stated above, may have pressing-jaw carriers which carry one or more pressing jaws, wherein the pressing-jaw carriers may also be formed integrally with the pressing jaws. Preferably, the cheek plates are hinged together via hinge pins. Furthermore, the individual pressing elements are preferably biased by spring elements for generating a holding force.

It is particularly preferred to combine the two inventions described above in the different preferred embodiments.

The inventions will be explained in more detail below with reference to preferred embodiments.

Fig. 1

eine schematische perspektivische Ansicht einer ersten Ausführungsform einer erfindungsgemäßen Pressschlinge,

Fig. 2

die in Fig. 1 dargestellte erste bevorzugte Ausführungsform der Pressschlinge in Seitenansicht,

Fig. 3

die in Fig. 1 dargestellte bevorzugte erste Ausführungsform der Pressschlinge in perspektivischer Ansicht in geschlossenem Zustand,

Fign. 4 und 5

perspektivische Ansichten der bei der ersten Ausführungsform verwendeten Schutzelemente,

Fig. 5a

eine schematische Teil-Schnittansicht durch das montierte Schutzelement,

Fig. 6

eine perspektivische Ansicht einer im Wesentlichen der ersten Ausführungsform entsprechenden Pressschlinge in Verbindung mit einem Pressfitting,

Fig. 7

eine schematische perspektivische Ansicht einer zweiten Ausführungsform einer erfindungsgemäßen Pressschlinge,

Fig. 8

die in Fig. 7 dargestellte zweite bevorzugte Ausführungsform der Pressschlinge in Seitenansicht,

Fig. 9

die in Fig. 7 dargestellte bevorzugte zweite Ausführungsform der Pressschlinge in perspektivischer Ansicht in geschlossenem Zustand,

Fig. 10 und 11

perspektivische Ansichten der bei der zweiten Ausführungsform verwendeten Schutzelemente und

Fig. 12

eine schematische Schnittansicht durch eine bevorzugte Ausführungsform des Halteelements.

Show it:

Fig. 1

FIG. 2 a schematic perspective view of a first embodiment of a press sling according to the invention, FIG.

Fig. 2

in the Fig. 1 illustrated first preferred embodiment of the press sling in side view,

Fig. 3

in the Fig. 1 illustrated preferred first embodiment of the press sling in a perspective view in the closed state,

FIGS. 4 and 5

perspective views of the protective elements used in the first embodiment,

Fig. 5a

a schematic partial sectional view through the mounted protective element,

Fig. 6

a perspective view of a substantially corresponding to the first embodiment of the press sling in conjunction with a press fitting,

Fig. 7

a schematic perspective view of a second embodiment of a press-loop according to the invention,

Fig. 8

in the Fig. 7 illustrated second preferred embodiment of the press sling in side view,

Fig. 9

in the Fig. 7 illustrated preferred second embodiment of the press sling in a perspective view in the closed state,

10 and 11

perspective views of the protective elements used in the second embodiment and

Fig. 12

a schematic sectional view through a preferred embodiment of the retaining element.

The first embodiment of the press sling ( FIGS. 1 to 3 ) has a plurality of pressing elements 10. The individual pressing elements each have a pressing jaw carrier 12 and a pressing jaw 14 connected in one piece with the pressing jaw carrier in this embodiment. The individual cheek plates are connected to each other via joints 16. For this purpose, the pressing jaw carriers each have interengaging lugs 18, 20, which are connected to one another via a bolt 22. The pressing elements 10 thus form a press chain or are hingedly connected to each other like a chain.

Between adjacent pressing elements or in the illustrated embodiment between adjacent pressing jaws 14 occur in the open state column 24 ( Fig. 1 ) on. For illustration, in Fig. 1 No protection element shown in this area, since otherwise the gap 24 would not be visible. In particular, when closing a press sling, the gap width decreases 24. If the closing by hand, there is a risk that the skin of the user is squeezed in this area.

To cover the gap 24 are in the in the FIGS. 1 to 3 illustrated embodiment, each protective elements 26 are provided. The protective elements 26 are in the FIGS. 4 and 5 shown in perspective. For a particularly complete coverage of the visible part of the column 24, the protective element 26 has a head element 28 and a side element 30. The head element 28 covers the part of the gap which is located in the region of an end face 32 (FIG. Fig. 1 ) of the pressing jaw is arranged. The side element 30 covers the part of the gap 24 arranged in the respective lateral region 34.

Furthermore, the protective element 26 has a foot part 36. The foot part 36 has an opening 38. In the assembled state, the hinge pin 22 protrudes through the opening 38. Not only the hinge pin 22 but also the two opposing protective elements 26 (FIG. Fig. 2 ) held.

In the illustrated embodiment, the head part 28 of the protective element 26 is arranged in a circular ring segment-shaped recess 42 formed by two adjacent pressing jaws 14. In this recess, a pin-shaped projection 44 is provided. This serves as anti-rotation. For this purpose, the pin-shaped projection 44, which is arranged in an outer side 46 of a pressing jaw, engages in a recess or bore 48 (FIG. Fig. 5 ). The bores 48 are arranged on an inner side 50 of the head part 28 of the protective element 26. These are in particular blind holes, whereby through holes are possible.

By providing two recesses 48, which are arranged mirror-symmetrically to a gap center plane 52, it is possible that in the FIGS. 4 and 5 shown protection element 26 based on Fig. 2 to arrange both on the left and right side of the pressing jaw carrier 12. It is not necessary to provide different protective elements 26 for this purpose.

Furthermore, the side element 30 of the protective element 26 has a substantially triangular cross-section, the corresponding projection 54 (FIG. Fig. 5a ) protrudes into the gap 24.

In Fig. 6 For example, the first preferred embodiment of a press sling described above is illustrated along with a press fitting 56 disposed on a tube 58. In this case, the press fitting 56 is a press fitting of unbalanced design with regard to the beads and depressions in its cross-sectional configuration, so that the position of the press sling must be clearly defined. For this purpose, the press fitting 56 has a groove 60 into which a front edge 62 (FIG. Fig. 4 ) of the protective elements 26 protrudes.

Furthermore, in order to ensure the correct combination of press sling and press fitting, for example, on a top side of the head element 28, a type such as a nominal width marking, designated XX in the exemplary embodiment, may be attached. The appropriate typing is provided with XX on an outside of the press fitting 56.

Furthermore, it is possible on an outer side of the side element 30 (FIG. Fig. 4 ) Further information such as the customer name udgl. provided. The color scheme of the protective elements can be chosen individually. This is in particular possible in a simple manner, since the protective elements 26 are preferably produced as plastic parts, in particular as plastic injection-molded parts.

In the second preferred embodiment ( FIGS. 7 to 11 ) is essentially a similar press loop. The essential difference is that the pressing jaws 63 have the same width as the pressing jaw carriers 64. Also in this embodiment, pressing jaws and pressing jaw carrier are integrally formed. Since the pressing jaws 62 do not protrude laterally beyond the pressing jaw carrier 64, a protective element 66 (FIG. FIGS. 10, 11 ) differently designed. The protection element 66 only needs one cover the end faces 68 of the pressing jaw carrier 64 arranged gap 70. A lateral area of the gap does not have to be covered. In Fig. 7 is not shown to illustrate one of the protective elements 66, so that the gap 70 is visible.

The protective element 66 is designed plate-shaped. For fixing, an opening 38 is also provided, so that a connection with the hinge pin 22 can take place. The connection is in this case again with the aid of a securing ring 40. Furthermore, a pin-shaped projection 44 is arranged on the outer side 68 of the pressing jaws 62, which engages in one of the two openings 48 of the protective element 66.

An outside 72 ( Fig. 10 ) of the protective element 66 may in turn be provided with a lettering 74, a nominal diameter designation 76 and the like.

Incidentally, the individual elements and functions of the second, in the FIGS. 7 to 9 shown press loop with the first in the FIGS. 1 to 3 shown press loop identical.

The further invention implemented in both embodiments relates to the provision of retaining elements for improved handling, in particular when opening and closing the press slings. According to the invention, holding elements 78 are preferably arranged on the two end pressing elements 10. The end pressing elements 10 are those pressing elements which are connected in an articulated manner to an adjacent pressing element 10 on only one side, so that opening of the pressing loops is possible here. In a preferred embodiment, the holding elements are plate-shaped, so that they form a finger well 80 (FIG. Fig. 12 ) exhibit. Furthermore, in each case two holding elements 78 are arranged opposite one another. The retaining elements are identical in this case. The fixing of the holding elements 78 via a bolt 82 and retaining rings 84. This makes it possible that the holding elements 78 are freely rotatable.

To open and close, it is thus possible to intervene in the opposite recessed grips, in particular with your thumb and forefinger. This makes the handling much easier and safer.

Claims (25)

Press sling for connecting in particular tubular workpieces, with
a plurality of articulated, chain-like interconnected pressing elements (10) and
gaps (24, 70) occurring between adjacent pressing elements (10), in particular when the pressing loop is open,
characterized in that
at least one of the gaps (24, 70) is at least partially covered by a protective element (26, 66). Press sling according to claim 1, characterized in that the pressing elements (10) have a pressing jaw carrier (12, 64) which carries at least one pressing jaw (14, 63). Press sling according to claim 2, characterized in that the pressing jaw carriers (12, 64) are articulated to each other in particular by means of a hinge pin (22). Press sling according to one of claims 1 to 3, characterized in that the at least one protective element (26, 66) on a hinge pin (22) in particular the associated gap (24, 70) associated hinge pin (22) is arranged. Press sling according to claim 4, characterized in that the at least one protective element (26, 66) has an opening (38) through which the hinge pin (22) is passed. Press sling according to one of claims 1 to 5, characterized by an anti-rotation device (44, 48) which connects the protective element (26, 66) with one of the pressing elements (10), in particular one of the pressing jaws (14, 63). Pressing sling according to claim 6, characterized in that the anti-rotation device has a projection (44), which is arranged in particular in an outer side (66, 68) of the pressing jaws (14, 63) and which extends into an inner side (50) of the protective element (26, 26). 66) provided recess (48) protrudes. Pressing sling according to claim 7, characterized in that the protective element (26, 66) has two recesses (48) arranged symmetrically with respect to a gap center plane (52). Press sling according to one of claims 1 to 8, characterized in that each hinge in particular each hinge pin (22) a pair of protective elements (26, 66) is arranged opposite to each other. Press sling according to one of claims 1 to 9, characterized in that the pressing jaws (14) are wider than the pressing jaw carrier (12) and the at least one protective element (26) additionally covers a lateral region of the gap (24). Press sling according to claim 10, characterized in that the lateral area of the gap (24) is covered by a side element (30) of the protective element (26) and an end area of the gap (24) by a head element (28). Press sling according to claim 10 or 11, characterized in that the protective element (26), in particular with the side element (30). connected foot member (36) for connection to the hinge pin (22). Press sling according to claim 11 or 12, characterized in that the side element (30) has a preferably in the entire length extending in the lateral region of the gap (24) in cross section preferably substantially triangular projection (54). Press sling according to one of claims 1 to 13, characterized in that the at least one protective element (26, 66) projects into an inner space of the press sling or a slot (60) of a press fitting (58). Press sling according to one of claims 1 to 14, characterized in that the at least one protective element (26, 66) has a customer identification (74) and / or a press sling designation (76). Press sling according to one of claims 1 to 15, characterized by in particular between the pressing elements (10) arranged spring elements for generating a holding force. Press sling for connecting in particular tubular workpieces, with
a plurality of articulated, chain-like interconnected pressing elements (10),
the press sling being open on two non-connected end press members (10),
characterized in that
holding elements (78) are arranged on the end pressing elements (10) for a user to open. Press sling according to claim 17, characterized in that a part of the holding elements (78) has a finger recess (80). Press sling according to claim 17 or 18, characterized in that each end-pressing element (10) at least two in particular opposing holding elements (78) are arranged. Pressing elements according to one of claims 17 to 19, characterized in that at least a part of the holding elements (78) is rotatably connected to the pressing element. Pressing elements according to claim 19 or 20, characterized in that two opposing holding elements are connected via a common bolt (82) with the pressing element (10). Pressing elements according to one of claims 17 to 21, characterized in that the pressing elements (10) have a pressing jaw carrier (12, 64) which carries at least one pressing jaw (14, 63). Pressing elements according to one of claims 17 to 22, characterized in that the pressing jaw carriers (14, 64) are connected to one another in an articulated manner, in particular by means of a hinge pin (22). Pressing elements according to one of claims 17 to 23, characterized by in particular between the pressing elements (10) arranged spring elements for generating a holding force. Pressing element according to one of claims 17 to 24, wherein gaps (24, 70) occur between adjacent pressing elements (10), in particular when the pressing loop is open and at least one of the gaps (24, 70) is at least partially covered by a protective element (26, 66).

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