Pipe clamp, in particular pipe coupling

The invention relates to a pipe clamp, in particular Pipe coupling, can be clamped with a clamp body and at least one radially inward of the clamp body arranged, the axial center of the clamp body toward inclined spike strip that between itself and the radially inner side of the clamp band at an acute angle limited, on one longitudinal edge projecting radially inwards, axially relative to the clamp body inclined teeth and having in the range of the other longitudinal edge in the radial direction and in the axial direction on the clamp body is supported.

Such pipe clamp is used either for coaxial Connecting ends smooth end portions of pipes and / or as a mounting clip with an additional Supporting or fastening part for securing to buildings.

If the pipe clamp is used as a pipe coupling, It then has at its two axial ends in each case a spike strip arrangement, each spike strip arrangement formed from two or more claw bands is. The teeth of the claws bands at the axial ends of the clamp body have to each other. this has during tightening of the clamp body to the effect that one Do not pull the pipe ends readily again can.

However, the installation of such a pipe clamp relatively expensive. must Tightening of the clamp body carried out with a relatively high accuracy. In the Rule for this is the use of a torque wrench required.

The invention is based on the object of the Assembly simplify.

This object is achieved in a pipe clamp of the initially mentioned type in that the acute angle free from a bending of the spike strip to radially counteracting inner side of the clamp body Means is.

In other words, the spike strip is only a Longitudinal edge of the clamp body and projects in other freely to the central axis of the clamp body. On the acute angle between spike strip and the clamp body bounding back of the spike strip is located no member for abutment with the spike strip could serve. When the clamp body is stretched, then the teeth of the spike strip can radially are pushed outward. Since the spike strip in certain Respect is resiliently, results here a certain spring action. The teeth and the tube ends So enter into a firmer connection, the stronger the clamp body is stretched. In addition, make the inclined teeth ensure that the two pipe ends with increasing voltage of the clamp body and concomitant reduction in diameter of the clamp body are moved toward each other and with a predetermined force required to move towards each other. At the same time is also an adaptation to different Diameters of the two pipe ends possible. The spike strip at the tube end having the larger diameter is adjusted slightly higher in the contact angle. Since the but spike strip on its back without support is, it can be freely pushed radially outwardly or be bent. Here at most increases Contact force of the teeth on the tube, however, it does not occur Overuse of any support means on.

Preferably, the spike strip is in the range of the other Longitudinal edge of the clamp body, the clamp body and the spike strip a adapted to each other have form of investment, the compressive forces in the axial and radial direction receives. It is therefore the largest Part of the periphery of the clamp body no permanent attachment between the clamp body and the spike strip required. It is sufficient if one on the clamp body and / or the spike strip formations provides that mutually support themselves so that the spike strip relative to the clamp body in a can be displaced axial direction. displacement in the radial direction (in each case based on a annular clamp body) is not possible anyway, because such a radial movement by the clamp body is inhibited.

It is particularly preferred that the clamp body has a radially inwardly bent edge portion, forming an inner angle, in which the other Longitudinal edge of the spike strip is arranged. you bend Thus the clamp body at its axial ends in a way, that the clamp body in cross-section a radially inwardly open U-shaped or C-shaped profile forms. If one the Spike strip inserts in the corner of the profile, the Spike strip the clamp body an angle ranging 15 ° - including 75 °, then provides the Edge portion against sufficient support a movement of the spike strip relative to the clamp body axially outward. The clamp body per se provides a sufficient abutment against a movement radially outwards. When the voltage in the clamp body increases because the clamp body a little closer to the tube is laid, then the spike strip can not dodge, but at best toward the Clamp body rebound, with possibly the Angle between the spike strip and the clamp body changes, but otherwise no changes to the geometry are observed.

Preferably, the spike strip at its ends is provided with the clamp body connected. This training is especially advantageous if one circumferentially the pipe clamp two or more claw bands provides. If the spike strip as a ring, optionally also as once interrupted ring is formed, then enough in many cases from this ring just in the Clamp body insert. If instead more used ring sections, then prevents the attachment at the ends of the spike strip, that the spike strip get lost. In addition, through the fixation the spike strip on the clamp body reached that the clamping forces with sufficient accuracy can form where they should act.

Preferably, the spike strip the clamp body positively connected. A positive connection is easy to manufacture. It does not require expensive Additional measures, such as welding, soldering or Gluing. It is only necessary, certain areas transform of the clamp body and / or of the spike strip, so that the corresponding compound prepared geometry can be. The positive connection limited to the ends of the spike strip.

It is particularly preferred that the clamp body and the spike strip connected by straps together are integral with the clamp body and positively with the spike strip or integral with the Spike strip and positive fit with the clamp body or form-fitting with the spike strip and the clamp body are connected. Such training is relatively easy to manufacture. It is sufficient for certain punching parts and bending. This may be at the Punching and bending operations carried out that for manufacturing the pipe clamp are required anyway.

Preferably, at each spike strip ironing least on two sides of the hoop with the clamp body and forms a pocket, into which the spike strip is inserted. Such a design of Strap increases the strength and stability of the Connection of the bracket with the associated part of the Clamp body or spike strip. To fix the Spike strip on the clamp body is indeed a movement the spike strip required against the clamp band. This, however, can be realized in most cases.

Here, it is advantageous when the bracket at its fixed at one end and bent up at the other end is. One then limited the bending process when attaching the spike strip on the clamp body on the bracket, So should not the clamp body nor the spike strip deform.

Preferably, the one end of the bracket at the edge portion attached. Thus, the bracket can already in a certain radial distance from the clamp body start, that one can possibly to a spare or other bending operation. In particular, when the bracket attached to both ends on the clamp body is, is not an extension of the bracket itself required.

Preferably, the spike strip has at least one End an attachment portion which compared to the Remainder of the spike strip is twisted. As already mentioned, includes the spike strip the clamp body an acute angle. This angle would also Include attachment portion, so that here a correspondingly large radial extent of the bracket required would. If one-contrast attachment portion towards the rest of the spike strip slightly twisted, then can the radial extension of the bracket reduce.

It is particularly preferred that the mounting portion at least approximately parallel to the clamp body is arranged. The strap can then its smallest having radial extension. At the same time, then, when the attachment section approximately plan against is pressed clamp body, an improved support the spike strip placed on the clamp body.

Preferably, the edge portion in the circumferential direction at least one interruption. Thus, a one "Hinge" form in the clamp body. This facilitates on the one hand the production of pipe clamp, because one at an "unfolded" clamp body better has access to the inside of the clamp body. This is particularly when inserting the claw bands advantageous. Second, the assembly or disassembly the pipe clamp easily by the installer, since it the Clamp body can bend, for example, the to lay pipe clamp around a pipe or pipe ends or to remove them.

Preferably, the interruption is formed by that the edge portion over a predetermined circumferential length is axially bent outward. This is the Clamping avoided that the lines of force in itself Clamp body form is submitted. This improves the capacity of the pipe clamp.

It is also advantageous if the interruption in the circumferential direction arranged outside a claw strip is. The function of the hinge will not disturbed by a spike strip. The mounting of the spike strip the clamp body is easier.

Then it can be provided that the circumferential length of the clamp body is selected such, that its circumferential ends abut one another when the clamp as far stretched is that the diameter of the circumscribed circle of the free Tooth ends is smaller than the taking into account a tube diameter tolerance range, the smallest nominal outside diameter of or included in the clamp Pipes (S).

This overstressing of parts is avoided, so that the clamp body so to speak, to mutual tensioned stop its ends (jaws) can be. The assembly can therefore be done in view, without any measuring instruments would be required including a torque wrench. Nevertheless the spike strip biased resiliently flexible.

The invention will in the following using a preferred Embodiment in conjunction with the drawing described in detail. Herein show:<dl tsize="6"><dt>Fig. 1</dt><dd>a perspective view of a pipe clamp, the form of a tube coupling is,</dd><dt>FIG. 2</dt><dd>a side view, partly in elevation,</dd><dt>Fig. 3</dt><dd>a section III-III according to Fig. 2,</dd><dt>Fig. 4</dt><dd>a section IV-IV, of Fig. 3</dd><dt>Fig. 5</dt><dd>an enlargement of a detail from Fig. 4,</dd><dt>Fig. 6</dt><dd>is a section VI-VI according to Fig. 3,</dd><dt>Fig. 7</dt><dd>an enlargement of a portion of FIG. 6</dd><dt>Fig. 8</dt><dd>an enlargement of a portion of Figs. 2 and</dd><dt>Fig. 9</dt><dd>a plan view of an interruption of a Brim.</dd></dl>

Fig. 1 shows a pipe coupling constructed as a pipe clamp 1, the non-profiled for joining smooth, ie End portions of two pipes (not shown) serves. The clamp 1 has a tensile Clamp body 2 which is bent approximately annular is. The two ends of the clamp body 2 be with Using turnbuckles 3 tensioned, wherein when tightening the turnbuckles 3, the ends of the clamp body 2 are moved toward each other, thereby extending inside diameter of the range of the clamp body 2 is surrounded, reduced. The clamping screws 3 are through a joint sleeve 4 passes and with a Joint sleeve 5 screwed. The hinge sleeves 4, 5 are arranged in loops 6 that by bending end portions the clamp body 2 and thermal joining, eg a humpback or spot weld, with the main part of the clamp body are formed and together with the hinge sleeves 4, 5 or hinge pin forming jaws of the pipe clamp.

The clamp body 2 has at its two axial Ends of edge portions 8 which are bent radially inwardly are. This is in particular from Figures 4 and 5 to recognize. The clamp body 2 therefore forms in Section, a radially inwardly open U-shaped or C-shaped Profile. In the angles between the Clamp body 2 and a respective rim portion 8 formed are, a spike strip is inserted. 9 The spike strip 9 comprises teeth 10 which, based on the Clamp body 2, are directed radially inwardly. there is the spike strip 9 is bent so that the teeth 10 also are directed axially inward.

At each axial end of the clamp body 2, two Claws belts 9 are arranged, which in particular in Fig. 3 can be seen. The clamp bands 9 are on their total length free from a support, ie between the ends of each spike strip 9 results over the entire length of the situation shown in Figure 5., that with an angular range 11 an angle α between the clamp body 2 and the spike strip 9 in the range of 15 ° - 75 ° or no support means elements are arranged. The back 19 of the spike strip 9 is free from any support. The Spike strip 9 can thus be elastic deformation radial zoom turn to the clamp body. 2 On Resistance is thereby mainly by the spike strip 9 self-applied, the corresponding at a Application of force deformed during tightening of the pipe clamp must be so that the teeth 10 radially can move outwards. For this reason, it is sufficient theoretically, the spike strip 9 at each axial one piece end of the clamp body 2 and it just in the angular range 11 between the clamp body 2 and the edge portion 8 insert. Out practical reasons, it is advantageous that Spike strip 9 multipart form and at its End form-fitting to be connected to the clamp body. 2 Such a form-fit connection is in Figures 7 and 8.

The spike strip 9 thus has a fastening section 12, which relative to the remainder of the spike strip 9 is bent so that the mounting portion 12 is approximately parallel to the clamp body. 2

The clamp body 2 includes a yoke 13, which thereby formed that the clamp body 13 in a circumferential direction before and after the strap 13 has two sections includes, extending in the axial direction. The area between the two sections (not shown in detail) then forms the bracket, which to that shown in Fig. 7 to obtain molded, pressed radially inwardly becomes. It can be seen that the bracket 13 on both the Clamp body 2 and at the peripheral portion 8 attached is. The connection between the clamp body 2 or the skirt portion 8 and the bracket 13 is integral, namely at both ends of the bracket 13. Between the Ironing 13 and the clamp band 2 is, so to speak a pocket formed, in which the attachment portion 12 9 of the spike strip can be inserted. Of the Strap 13 may also on three sides with the clamp body 2 and possibly be the edge portion 8, said the pocket for insertion of the spike strip 9 only is open on one side.

The other end of the spike strip 9 is similarly Way fixed: is from the clamp body 2, a bracket 14 bent out of the in by a U-shaped cut is the clamp body 2 formed. The resulting Tab may be substantially perpendicular relative the clamp body radially inwardly and at the end yet once a U-shape are bent radially outward so that the other end portion 15 of the spike strip 9 from Strap 14 may be enclosed. This is a form-fit connection between the clamp body 2 and the spike strip 9 is formed that without additional Fasteners or methods manages. Naturally can also, the attachment portion 15 relative to the Remainder of the spike strip bent 9 or connected. The different representation in Figures 7 and 8 was chosen to demonstrate both possibilities.

As is apparent from Fig. 1, at the edge portion 8 each circumferential end interruption 16. This interruption 16 is shown enlarged in Fig. 9. It It can be seen that the edge portion 8 to the outside is bent and forms a surface 17 which substantially in the same plane as the clamp body 2 lies. This embodiment has the advantage that the not so greatly disturbed flow of forces in the circumferential direction is like a simple radial incision in the Edge portion 8. The interruption 16 is a Type hinge formed, in which the clamp body 2 after loosening the clamping screws 3 can be bent. This bending facilitates the manufacture of the pipe clamp 1, in particular the insertion or introduction of the Claws belts 9. The fastening portions 12 in the region the hinge sleeves 4, 5 are open, Clamp body inserted. Then the bracket 14 bent around at the other end to the end sections 15, and the claws 9 bands are reliable in the clamp body 2 fixed.

Also during the assembly or disassembly of the pipe clamp 1 to and from a tube it may be advantageous for the installer If it can be bend the pipe clamp 1 to they round down to the tube or remove from this.

The operation of the pipe clamp can be as follows represent:

If the pipe clamp 1 to a pipe or two pipe ends has been wrapped, the clamping screws 3 are attracted. Here, the inside diameter decreases the surrounded by the clamp body 2 space. The teeth 10 come initially into contact with and later engaged with the peripheral surface of the pipe or pipe section. When the clamping screws 3 further tightened be and the pipe clamp 1 so excited even more is then the teeth 10 radially outwardly dodge. You have to, because the claw bands 9 so to speak, around the corner around the angular range 11 be tilted, also a corresponding movement in Axially run inside, so that particular upon the application of pipe ends, the pipes more are pressed toward each other. Since the claw bands 9, Apart from the plant of the longitudinal edge 18, which do not is provided with teeth 10, and the attachment of the End portions 12, 15 is not supported in the radial direction are, the teeth 10 can be freely moved outwards. In this case, although the pressing force is increased to the pipe. However, other parts can not be overloaded. In particular, must not pay attention to that Pipe clamp 1 with a predetermined torque is tensioned. They can speak span perspective and the voltage, for example, it should check, whether the two loops 6 of the clamping jaws with the hinge sleeves 4, 5 to a predetermined distance or, with correspondingly longer clamp band, on stop have been tightened. Preferably, therefore, the Circumferential length of the clamp body 2 is selected so that bear its peripheral ends to each other when the clamp is so far stretched that the diameter of the circumscribed circle the free tooth ends is smaller than the taking into account a tube diameter tolerance range, smallest nominal outside diameter of or in Clamp to be received pipes (S).

one would have on the inner side of the claws belts 9, so between the oblique, the inside of the clamp body 2 rear side facing the claw bands 9 and the clamp body 2, a support, for example in the form a rubber sleeve or bent out of the clamping band 2 Projection or the like, then would the radially outward movement of the teeth hampered with what the present invention is to be excluded.

The attachment of the claw strips 9 on the clamp body 2 can also take place in other ways, for example, characterized in that the spike strip bracket corresponding 9 are formed, the or in recesses, openings Holes on the clamp band 2 intervene. One can also provide bracket, which are designed as separate parts and the spike strip and corresponding formations on Clamp body embrace. 2

It is also not necessary that the clamp band 2, the edge portions 8 which when the corresponding holders of the claw strips 9 on the clamp body 2 can be achieved in other ways. One possibility would be the spike strip 9 protruding radially to attach or form, the projections in corresponding recesses on the clamp body 2 engage.