DE102005026666A1 - Clamping system for axially fixing an outer tube to an inner tube sliding in the outer tube comprises a spreading element having longitudinal cylindrical shells joined together on a free end using a connecting unit - Google Patents

Abstract

Clamping system (10) comprises a spreading element (20) having longitudinal cylindrical shells joined together on a free end using a connecting unit (25). The cylindrical shells move the free ends away from each other on radially pressing together the opposite open ends. Independent claims are also included for the following: (1) Spreading cone for the clamping system; (2) Clamping bolt for the clamping system; (3) Holder for a clamping bolt for the clamping system; and (4) Method for mounting a clamping system. Preferred Features: The connecting unit is formed as a hoop and each cylindrical shell is impinged on the free end with a spring force of a side of the connecting unit.

Description

The The invention relates to a clamping system, clamping system elements and a Method for mounting a clamping system according to the preambles of independent Claims.

It is known clamping systems for adjustable length To use pipes. Such systems allow a smaller diameter Inner tube in a larger diameter outer tube to push in and in a desired to fix axial position.

The utility model DE 202 07 554 U1 discloses a length-adjustable tube with a clamping system in which the inner tube can be clamped in the outer tube with a spreading device held on an insertion end of the inner tube. The spreading device comprises a radially auseinanderrückdrückbares and provided with an inner cone spreader and provided with an opposite outer cone and axially displaceable in the expansion element Spreizkegel received and an axially directed, rotatably held on the inner tube clamping bolt, which is in operative connection with an internally threaded bore in the expansion cone. The inner cone of the expansion element opens towards the inner tube. To improve the clamping longitudinal ribs are provided on the expansion element on the outside.

Of the Clamping bolt is held with one end in a rotation on the inner tube Attached end plug and is axially fixed in this by gluing and held against rotation. Penetrates with the other end of the clamping bolt this the internal threaded bore of the expansion cone and also an internal bore of the expansion element. At his from the expansion cone and the expansion element outstanding end is the clamping bolt with an outer, cap-like Stop rotation connected. The non-rotatable connection is made by Screwing on, pressing on, sticking on, overmolding with plastic or like.

Of the Stop can also be formed by a molded head on the clamping bolt become. However, this requires a different order during assembly. Furthermore then the spreader must laterally over Spreizkegel and clamping bolts to be brought. Such known clamping systems are usually not for an automated assembly suitable. It is rather many process steps only manually possible.

The Spreizelement is between an inner stop on the inner tube and the outer stop axially movable within narrow limits at the free end of the clamping bolt held so with jerky Loads the length-adjustable Tube continues to pinch and does not distort or yield and such an undesirable Yielding of the clamping can be avoided in a shock-like load can.

task The invention is to a clamping system and clamping system elements create, with which an improved clamping of the clamping system with a greater clamping force with simultaneous automation of assembly is possible. Furthermore, a should Method for mounting a clamping system can be specified.

The The object is achieved by the Characteristics of the independent claims solved. Favorable price and further developments of the invention are the further claims remove.

The clamping system according to the invention for axially fixing a position of an outer tube relative to a telescopically inserted into the outer tube inner tube has a spreader cone with a conical outer surface, a radially expandable by the expansion cone at one end apart expanding element, and an axially directed inside the Spreizkegels with its internal thread in operative connection standing clamping bolt on. According to the invention, it is provided that a spreading element is formed from at least two longitudinally divided cylindrical shell parts, which are connected at their respective one free end with a connecting means so that at least in the mounted state in the outer tube at a radial disengagement of the opposite, open ends of the Cylinder shell parts also move the free ends away from each other. This allows a significant parallelization of the contact surfaces of the expansion element on the outer tube and thus an increase in the clamping force of the expansion element can be achieved. While in known systems due to the taper of the expansion cone a system of the expansion takes place at most in the lower third, can be brought according to the invention in the expansion element more than twice as much, up to 75%, its axial length to the plant. This is at the same axial movement of the expansion cone in the expansion element, according to a same spreading of the expansion element, a considerably higher clamping force of the clamping system available as in known clamping systems. For clamping the clamping system are in conventional design, for example, a metric thread M6 an internal thread of the expanding cone and an external thread of the clamping bolt with a pitch of 1 mm, corresponding to an axial stroke of the expanding cone of 1 mm, 2.5 to 3 turns of the expanding cone on the Clamping bolts necessary. In the inventive Tensioning system is a relatively small tightening force, in particular around 1 Nm, sufficient to withstand a higher weight load of up to 150 kg. Conventional tensioning systems require a higher tightening force, for example 1.4 to 1.5 Nm, to tolerate a lower weight load of just over 100 kg. The shape of the expansion element further allows easy feedability in a machine assembly. The clamping bolt may be integral with the inner tube or be plugged into the inner tube or be held with a separate receiving element which is connected to the inner tube.

A preferred and very efficient design provides that the Connecting means bow-shaped is, each cylinder shell part at its free end with a directed to the cylinder axis spring force of a leg of the connecting means is charged. The connecting means can be easily produced. Preferably, the spreader and the connecting means are integral. It are just tools necessary.

a particular advantage results in the further embodiment, when the expansion element has an inwardly directed collar at its open end, with the corresponding paragraph of the clamping bolt overlapped and so the expansion element with the clamping bolt is axially latched. Conveniently, the expansion cone is then already screwed onto the clamping bolt and serves as a guide for the Spreading element when placed on the clamping bolt. In this way can the expansion element in a simple manner on the clamping bolt in the axial Be clipped on direction. This can be done in particular by machine.

is the clamping bolt along its longitudinal extent Starting from the paragraph on one side as a threaded part with an external thread and on another side as a plug-in part with means for positive connection formed with a receiving element, the attachment of the Clamping pin in the receiving element and the inner tube very simplified become. A manual gluing, screwing or the like is unnecessary.

Preferably is the receiving element for the Insertion of the clamping bolt arranged in the inner tube and with this axially fixed and rotatably connected.

A advantageous improvement of the clamping force results when mounted Condition between the free end of the expansion element on its male side face and one of those opposite free end of the receiving element a minimum distance of at least 100 μm, preferably 400 microns up to 1000 μm, more preferably around 500 μm. The minimum distance causes one at the outer tube acting axial force in which the spreader is clamped, which is a relative movement opposite cause the inner tube in the sense of shortening the entire tube would, the expansion cone is pushed deeper into the expansion element and this spread even further. Because of the large contact surface is Accordingly, the clamping force of the clamping system even with jerky Load significantly improved. A minimum distance of preferably 500 microns corresponds with an M6 thread with a rotation of 180 °. The axial Loading with a displacement of 500 microns would therefore further tightening the Clamping system by half a turn over the 2.5 to 3 turns match when tightening the clamping system addition.

It is particularly advantageous if the clamping bolt is a left-hand thread having. The left-hand thread leads in addition, when it travels in tensioning the expansion cone in the expansion element. In an axial load as described above, then leads the Movement of the expansion cone in the expansion element into another Spreading and better clamping. With a right-hand thread would mind the expansion cone migrate out of the expansion element, and an axial Burden could not to an increase in the Spread and thus lead the clamping force.

A advantageous development provides that the federal government of the expansion element a slope has, which is inclined to the open end so that at a Removal of the expansion element a corresponding tool or a Casting over the slope of the Inside of the expansion element under slight and permanent spreading of the expansion element herausführbar is. This happens expediently in a state of the expansion element, if this still deformable is, for example, after casting or spraying as a plastic part while still warm. This can during insertion of the expansion element in the outer tube an immediate clamping of the clamping system can be achieved, as the Spreizelement in its lower, slightly spread area on outer tube can stick without jamming. If the clamping system is then tightened, can clamp the spreader immediately.

A reliable connection between the clamping bolt and the receiving part can take place when the clamping bolt on the insertion part diametrically opposed, radially projecting, preferably integrally formed guide means which are provided in corresponding recesses of the receiving part for positive connection of the clamping bolt with the receiving part. The recesses in the receiving part are expediently so deep in the axial direction that insert after Clamping bolt the minimum distance between the later patch spreader and the receiving part is guaranteed.

For the assembly, especially if it is machine-workable, it is advantageous when the expansion cone is formed with a conical outer surface with a larger diameter and one smaller diameter end and with at least two protruding laterally Guide elements for Intervention in corresponding columns of the expansion between the cylinder shell parts, wherein the guide elements with their outer surfaces a radial distance from each other, equal to the diameter of the larger end of the expansion cone is. Overall, this results in a cylinder-like Shape of the expansion cone, which is feasible in a cylindrical tube. The expansion cone is then included, for example, by such a tube the assembly can be fed to the assembly station.

A Axial expansion of the expansion cone is preferably the same as or shorter as the threaded part of the clamping bolt. This can be material in the production the clamping bolt can be saved, the no projection on the expansion cone or the expansion element must have.

The Elements of the clamping system according to the invention have the extra Advantage that arranged within the expansion element Parts, ie clamping bolts, expansion cone, and the diameter of the clamping bolt receiving bore of the receiving element for a variety of Outer diameters or pipe sizes remain unchanged can. Fall for standardized pipe sizes, for example at telescopic poles for skiing or hiking lower tooling costs, as for common sizes only the outside diameter of the expansion element and the receiving element to the inner diameter from outer tube and inner tube must be adjusted the "internal geometry" of the clamping system remains the same. Which minimum outer diameter of the expansion element is representable, hangs essentially from the given slope of the expansion cone and a desired one Minimum wall thickness of the expansion element.

The Spreading element according to the invention for a Clamping system for axial fixing of an outer tube with respect to a telescopic into the outer tube insertable inner tube has a cylindrical base body, which is divided longitudinally into at least two cylindrical shell parts, wherein the Cylinder shell parts at one end with a connecting means so are connected, that they in a spreading movement on the opposite End are moved away from each other.

Prefers is the connecting means of the expansion element according to the invention as close circular Bow formed, with one leg each at the free end of the cylinder shell parts attacks and with its diameter from the free end axially extends away.

For a preload the expansion element is advantageous on the connecting means opposite end of the expansion element according to the invention after arranged inside the federal government, whose to the connecting means pointing inner surface has a slope inclined towards the open end. The slope forms a cone portion with a preferred opening angle of 120 ° to 160 °, especially preferably from 130 ° to 150 °, which is opens to the connecting means.

to Improvement of the clamping force can outer recesses be formed so that webs are as a contact surface between the recesses stay. Even with one possibly oval deformation of the expansion element, the webs are safe to.

Prefers is the main body the expansion element according to the invention formed from plastic, in particular by a spraying or casting process produced. Alternatively, the expansion element may be made of metal.

Of the Spreizkegel according to the invention for a clamping system for axially fixing a position of an outer tube relative to a telescopic into the outer tube retractable inner tube is characterized by the fact that he has a having conical outer surface with a larger diameter and a smaller diameter end and at least two laterally extending, axially extending guide elements wherein the guide elements one with their outer surfaces radial distance from each other, equal to the diameter of the larger end of the expansion cone is. In a longitudinal section through the guide elements shows a cylindrical Outline, which allows easy feedability of the expansion cone in an automatic assembly process allows.

Preferably is designed as a left-hand thread internal thread. The expansion cone is preferably formed from plastic. alternative the expansion cone can also be formed of metal.

The clamping bolt according to the invention for a clamping system for axially fixing an outer tube to a telescopically insertable into the outer tube inner tube has starting from a larger diameter paragraph on this along a longitudinal extent on one side extending threaded part with left-hand thread, while an insertion part adjoins on an opposite side of the shoulder, the insertion part has diametrically opposite, radially projecting, preferably integrally formed guide means for positive connection with a receiving part. The guide means preferably form the clamping bolt protruding wings, which are positively locked during assembly with a receiving element.

Prefers is at the transition from the shoulder to the male part a cylindrical neck is arranged, the diameter smaller than the paragraph and diameter larger than the male part is formed. At the neck lies in the assembled Condition of the collar of the expansion element on.

Farther preferred is an embodiment of the clamping bolt according to the invention as a pressed part. The thread can be cut later or also be formed by pressing. A preferred material for the Clamping bolt according to the invention is an aluminum alloy. The pressing leads to a homogeneous structure of the pressed part with improved hardness.

at the receiving element according to the invention for one Clamping bolt for a clamping system for axially fixing a position of an outer tube across from a telescopic into the outer tube retractable inner tube is provided with a central bore at least two diametrically arranged recesses for positive reception from corresponding management resources a clamping bolt. The clamping bolt can with wing-like guide elements be staked in the recesses.

At an end face of the receiving element is preferably a circumferential larger web formed in the mounted state on the free end of a Inner tube rests.

Prefers can at one of the end opposite end of a recess designed to spread a male part of a clamping bolt be.

The inventive length-adjustable tube with a clamping system for axially fixing a position of an outer tube across from a telescopic into the outer tube retractable inner tube is characterized by a spreader from at least two longitudinal shed divided cylinder part, which is inserted in the outer tube, which Cylinder shell parts at their respective one free end with a Connecting means are interconnected so that at one caused by a spreader radial disengagement of the opposite open ends of the cylinder shell parts the free ends to move away from each other. One on the inner tube axially fixed Clamping bolt engages with its threaded part having a left-hand thread in the expansion cone located in the expansion element. The clamping system allows a significant parallelization of the contact surfaces of the Spreading element on the outer tube and thus a high clamping force of the expansion element, so that the clamping is improved. Furthermore, the clamping system can be advantageous for various Pipe diameter can be used, wherein for a large Maßbereich only the outer diameter of expansion element and receiving element to the current pipe inside diameter are to be adapted. Through the opening angle of the expansion cone and the required minimum wall thickness of Spreizelements can a minimum size of the smallest inner tube diameter be specified.

Preferably In the inner tube, a receiving element is used, in which the clamping bolt with its plug-in part form-fitting is used in the length-adjustable tube according to the invention can also more than two pipe parts are assembled, with each transition from an inner tube to an outer tube an inventive clamping system can be used.

The Clamping system can for various length-adjustable Tubes are used, especially for sporting goods, such as hiking poles and ski poles, Household and garden tools with telescopic poles, exhibition and exhibition needs with telescope stands and such more.

at the method according to the invention for inserting a clamping system in a length-adjustable tube with an outer tube and a telescopically inserted into the outer tube inner tube following steps are performed. A clamping bolt with its provided with guide means plug in a bore of a receiving element with corresponding recesses introduced and positive fit connected. At a tail the male part of the clamping bolt is spread with the receiving element. The equipped with the clamping bolt Receiving element is inserted into the inner tube. The receiving element is firmly connected to the inner tube. An expansion cone is placed on the clamping bolt screwed onto the threaded part until the expansion cone on a larger paragraph of the clamping bolt comes to rest, a spreading element is on the Spreading cone led from its free end to one at its open end End of inbound collar over the heel snaps. Finally will the expansion element in the outer tube introduced.

Advantageously, the steps can be carried out essentially by machine. In particular, the cylindrical expansion cone in a cylinder shaped pipe are fed to its mounting position.

conveniently, the spreading element can be placed on a belt-like feeding means, the engages in gaps between cylinder shell parts of the expansion element and on this to the with the expanding cone, the clamping bolt and the Pickup equipped Inner tube transported to a mounting position, there from a Stamping device adopted by the supply means and over the spreading cone are pushed.

From A particular advantage is that the expansion element in lighter Spreizstellung can be mounted, so that when inserting in the outer tube The tensioning system is ready to start immediately. The slight spreading position can for example, during demolding after the manufacturing process of the expansion element be generated.

The Invention is exemplified below, without limitation Generality, based on an embodiment shown in the drawing explained in more detail.

It demonstrate:

1 a section of a preferred length-adjustable tube with a preferred clamping system in the assembled state;

2a , b, c different views of a preferred receiving element in side view (a), in longitudinal section (b) and in plan view (c);

3a , b different views of a preferred clamping bolt in a lateral view (a) in a lateral view rotated by 90 ° about its longitudinal axis (b);

4a , b, c different views of a preferred expansion cone in a lateral view (a), rotated in a lateral view at 90 ° about its longitudinal axis (b) and in plan view (c); and

5a , b, c different views of a preferred expansion element in a side view (a), as a longitudinal section (b) and as a cross section (c).

In The figures are functionally the same or the same elements each numbered with the same reference numerals.

As 1 can be seen, a preferred length-adjustable tube has at least one transition between an inner tube 11 and an outer tube 12 on. At the transition is a preferred tensioning system 10 arranged. In the 1 are the individual elements of the Spannsys system 10 for the sake of clarity, only generally designated. The details of the individual clamping system elements 20 . 30 . 40 . 50 are explained in more detail in the following figures. The clamping system 10 serves to axially fix the position of the outer tube 12 opposite the telescopic into the outer tube 12 retractable inner tube 11 ,

At a shank end 13 of the inner tube 11 is a pickup element 30 rotatably and axially fixed and lies with a collar 31 on a front ring of the inner tube 11 on. The largest diameter of the waistband 31 closes flush with the outer diameter of the inner tube 11 from. In the receiving element 30 is a tension bolt 40 rotatably received, on a spreader cone 50 is screwed on. The spreading cone 50 opens to the inner tube 11 out. The clamping bolt 40 has a left-hand thread. For the sake of clarity, the left-hand thread of the clamping bolt protrudes 40 over the spreader cone 50 but preferably concludes with this.

The spreading cone 50 is axially movable within a spreading element 20 arranged by putting on the clamping bolt 40 is twisted. Will the spreading cone 50 in the 1 moved upward, the spreader opens 20 by being pressed radially outward. The spreading element 20 has in its interior a conical expansion cone 50 corresponding inner cone on. From the spreading cone 50 are diametrically opposite two guide elements 51a . 51b off, the spreader cone 50 against rotation in the expansion element 20 hold and guide axially. The spreading element 20 is made of at least two longitudinally divided cylinder shell parts 21a . 21b ( 5 ) formed at their respective one free end 23 with a connecting means 25 are connected to each other so that when radially pushing apart the opposite open ends 24 the cylinder part shells 21a . 21b the free ends 23 move away from each other when the spreader 20 in his outer tube 12 is used.

The spreading cone 50 is in the released state of the clamping system 10 on a heel 49 of the clamping bolt 40 at. The spreading element 20 overlaps the paragraph 49 and lies on a cylindrical neck 48 on the home page of the paragraph 49 at.

In the assembled state lies between the free end of the expansion element 20 and one of these opposite free end face 33 of the receiving element 30 a minimum distance 15 of at least 100 μm, preferably about 500 μm. If a force F acts in the direction of the arrow axially from top to bottom on the length-adjustable tube, the spreader moves gel 50 in the expansion element 20 upwards and leads to a radial opening of the expansion element 20 and thus to a clamping of the clamping system 10 ,

2 illustrated in the subfigures 2a . 2 B . 2c different views of a preferred receiving element 30 for a clamping bolt 40 of the clamping system 10 out 1 ,

In the side view in 2a is a rotationally symmetrical about an axis A pot shape of the receiving element 30 to recognize with a pipe-side in the installed state end 32 in the inner tube 11 ( 1 ) and a free end face 33 , which in the assembled state to the outer tube 12 points ( 1 ). From there, the clamping bolt 40 introduced ( 1 ). At the front 33 a larger federal government 31 formed on the free end of the inner tube 11 rests on ( 1 ). The axis A also corresponds to the longitudinal axis A of the clamping bolt 40 and a total of the longitudinal axis of the inner tube 11 and the outer tube 12 in the area of the clamping system 10 ,

The 2 B and 2c let recognize that a central bore 35 is provided with at least two diametrically arranged recesses 36a . 36b for the positive reception of corresponding guide means 46a . 46b of the clamping bolt 40 are provided.

At the front 33 opposite end 32 is a depression 34 for spreading a plug-in part 43 ( 3 ) of the clamping bolt 40 educated. The recesses 36a . 36b are axially formed so long that when inserting the clamping bolt 40 a sufficient distance between the front side 33 and the paragraph 49 stays, so the minimum distance 15 between an end face at the lower end of the expansion element 20 and the front side 33 is guaranteed ( 1 ).

From the front side 33 a chamfer runs to the hole 35 , which is inclined at an angle of, for example, 45 ° to the bore.

The 3a and 3b show different views of a preferred clamping bolt 40 for the in 1 illustrated clamping system 10 for axially fixing a position of an outer tube 12 opposite to a telescopic into the outer tube 12 retractable inner tube 11 ,

The clamping bolt 40 is designed as an elongated cylinder. Starting from a larger diameter paragraph 49 close to this along a longitudinal extension on one side of a threaded part 42 with a thread designed as a left-hand thread 41 and on an opposite side a plug 43 to the paragraph 49 at. At the plug-in side 47 of the paragraph 49 is a cylindrical approach 48 to the paragraph 49 formed. Below the approach 48 has the male part 43 two diametrically opposite, preferably molded guide means 46a and 46b on that as wings in recesses 36a . 36b of the receiving element 30 ( 2 B . 2c ) for the positive locking of the clamping bolt 40 serve. At the tail 45 of the plug-in part 43 has the clamping bolt 40 a recess 44 on which is a splaying in of the receiving element 30 used clamping bolt 40 relieved by the edge of the recess 44 is folded outwards and radially into the recess 34 of the receiving element 30 engages ( 2 B ).

The clamping bolt 40 is preferably formed as a pressed part of an aluminum alloy, preferably AIMgPb. 3b shows the clamping bolt about its longitudinal axis A rotated by 90 °. The relative to the diameter of the male part 43 central positioning of a wing-like guide means 46a can be seen. The other guide 46b is arranged symmetrically to it.

Different views of a preferred expansion cone 50 for a clamping system 10 for axially fixing a position of an outer tube 12 opposite to a telescopic into the outer tube 12 retractable inner tube 11 ( 1 ) are the 4a . 4b and 4c refer to.

The spreading cone 50 has a conical outer surface 54 with a larger diameter and a smaller diameter end 52 . 53 on. The spreading cone 50 has a cone with an opening angle of about 5 ° to 15 °, preferably by 10 °. A favorable opening angle can also be around 12 ° when the clamping system 12 For example, to be used in a ski pole or a walking stick with the usual pipe diameters there.

From the outside surface 54 are laterally two diametrically opposed, axially extending guide elements 51a . 51b from, with the guide elements 51a . 51b with their outer surfaces 56a . 56b have a radial distance from each other equal to the diameter of the larger end 52 of the spreading cone 50 is. In the side view in 4a corresponds to the contour of the expansion cone 50 despite its self-contained outer surface 54 a cylinder. As a result, the expansion cone 50 be easily guided in a cylindrical feed to a mounting station. In the rotated by 90 ° about its longitudinal axis A view in 4b is the conical shape of the expansion cone 50 to recognize. The top view in 4c leaves the arrangement of the guide elements 51a . 51b and the cylindricization of the spreading cone 50 detect.

The spreading cone 50 has an internal thread designed as a left-hand thread 55 on top of that, with the thread 41 of the clamping bolt 40 cooperates to the expanding cone 50 axially along the clamping bolt 40 to be able to move.

The 5a . 5b . 5c show a preferred expansion element 20 for a clamping system 10 for axially fixing a position of an outer tube 12 opposite to a telescopic into the outer tube 12 retractable inner tube 11 , The spreading element 20 has a cylindrical base body, which in at least two cylindrical shell parts 21a . 21b is divided longitudinally to a longitudinal axis A. Between the cylinder shell parts 21a . 21b is each a gap 29 formed parallel to the longitudinal axis A, in each of which a guide element 51a respectively. 51b of the spreading cone 50 intervenes. The longitudinal axis A falls, as already mentioned above, with the longitudinal axis A of the clamping bolt 40 and the spreading cone 50 together. The gap 29 ensures an anti-rotation of the expansion cone 50 in the expansion element 20 and provides an axial guidance of the same. The main body of the expansion element 20 is preferably formed of plastic.

The cylinder part shells 21a and 21b are at their respective one end 23 with a connecting means 25 connected ( 5a ). The connecting means 25 is designed as a circular bracket, each with a leg 25a . 25b at each free end 23 the cylinder part shells 21a . 21b attacks and with its diameter from the free end 23 extends axially away. In this case, the supernatant of the bonding agent 25 over the end 23 larger than a semicircle of the circular stirrup. The connecting means 25 Of course, it can also be shaped differently if the function is retained. The connecting means 25 causes a spring force so that at least in the assembled state in a pipe at a spreading movement at the opposite end 24 the cylinder part shells 21a . 21b also in the end 23 the cylinder part shells 21 . 21b away from each other. Put the spreader 20 in the outer tube 12 ( 1 ) and becomes the expanding cone 50 from the open end 24 to the end 23 moves, the spreader opens 20 and settles at the beginning of the opening because of the conical expansion cone 50 and the opposite conical design of the inner circumference of the expansion element 20 ( 5b ) first in its lower area inside the outer tube 12 at ( 1 ). This leads over the connecting means 25 to a spreading movement at the opposite end 23 , so that a parallelization of the spreading movement of the cylinder shell parts 21a . 21b succeed.

In 5a indicated in dotted lines is the slight expansion of the expansion element 20 which can be achieved by demoulding in the still deformable, warm state during manufacture, to facilitate assembly and immediate clamping of the clamping system 10 to reach.

This is at the end 24 which is the connecting means 25 Opposite is an inward-facing waistband 26 arranged, the connection means to the 25 pointing inner surface one to the end 24 and inclined to the axis A slope 27 has, according to one to the end 23 opening cone with an opening angle of 130 ° -150 °, preferably about 140 °. When assembled, the threaded part 42 of the clamping bolt 40 and the expanding cone 50 in the interior of the expansion element 20 added.

The Bund 26 snaps over the heel during assembly 49 of the clamping bolt 40 and comes to rest on its cylindrical extension 48 ( 1 ). For this purpose, the spreading element 20 at its lower end 24 an opening 22 with a diameter equal to the outer diameter of the neck 48 equivalent. In this way, the spreader 20 with the clamping bolt 40 Lockable and axially secured.

To improve the clamping are the outer circumference of the cylinder shell parts 21a . 21b axial recesses 28 so incorporated that a bridge 28a on the cylinder shell 21a and a jetty 28b on the cylinder shell 21b with the original diameter stops. The bridges 28a . 28b serve as a contact surface. This is in the in 5c sketched cross-section of the clamping bolt 20 to recognize.

The in the 1 to 5 described elements such as receiving element 30 , Clamping bolts 40 , Expanding cone 50 and spreading element 20 are suitable for automated assembly. The inventive method for mounting a in 1 illustrated clamping system 10 in a length-adjustable tube with an outer tube 12 and a telescopic into the outer tube 12 retractable inner tube 11 has the steps described below.

The clamping bolt 40 will be with his with leadership 46a . 46b provided plug-in part 43 into a hole 35 of the receiving element 30 with corresponding recesses 36a . 36b introduced and positively connected, in particular notched. At a tail 45 of the plug-in part 43 becomes the clamping bolt 40 with the receiving element 30 braced. The with the clamping bolt 40 equipped receiving element 30 gets into the inner tube 11 used. The receiving element 30 is with the inner tube 11 firmly connected, for example by a notch in the inner tube 11 , The spreading cone 50 is on the clamping bolt 40 on the threaded part 42 screwed on until the spreader cone 50 at one around larger catchment 49 of the clamping bolt 40 comes to the plant. The spreading cone 50 is preferably supplied in a cylindrical tube to its mounting position.

The spreading element 20 is over the spreader cone 50 from his free end 53 to its end 52 led until one at the open end 24 of the expansion element 20 located, inwardly directed waistband 26 about the paragraph 49 snaps.

The spreading element 20 For this purpose, it is preferably placed on a belt-like feeding means, for example a flat steel, which is arranged in columns 29 between cylinder shell parts 21a . 21b of the expansion element 20 engages and on this to the with the expanding cone 50 , the tension bolt 40 and the receiving element 30 equipped inner tube 11 transported to a mounting position. There is the expansion element 20 taken over by a stamping device of the feeding means and the spreading cone 50 pushed. The spreading element 20 is mounted in a slight spread position, so that when inserting into the outer tube 12 the clamping system 10 immediately ready to start. Subsequently, the spreading element 20 in the outer tube 12 introduced and can be tightened.

10

clamping system

11

inner tube

12

outer tube

13

spigot

20

spreader

21a, b

partial shell

22

drilling

23

free The End

24

Restricted The End

25

connecting means

25a, b

leg

26

Federation

27

slope

28

recess

28a, b

web

29

gap

30

receiving element

31

Federation

32

pipe-associated The End

33

front

34

deepening

35

drilling

36a, b

recess

40

clamping bolt

41

external thread

42

threaded part

43

plug

44

recess

45

tail

46a, b

guide means

47

einsteckteilseitige face

48

cylindrical approach

49

paragraph

50

expanding cone

51a, b

guide element

52

The End

53

The End

54

conical outer surface

55

inner thread

56a, b

outer surface

Claims (31)

Clamping system for axially fixing the position of an outer tube ( 12 ) against a telescopic into the outer tube ( 12 ) retractable inner tube ( 11 ), with a spreading cone ( 50 ) with conical outer surface ( 54 ), through the expansion cone ( 50 ) at least at one end ( 24 ) radially expansible expanding element ( 20 ), an axially directed, inside the Spreizkegels ( 50 ) with its internal thread ( 55 ) in actively connected clamping bolt ( 40 ) on the inner tube ( 11 ) is axially fixed, wherein the expansion cone ( 50 ) with its cone to the inner tube ( 11 ) opens, characterized in that the expansion element ( 20 ) of at least two longitudinally divided cylinder shell parts ( 21a . 21b ) formed at its respective one free end ( 23 ) with a connecting means ( 25 ) are connected to one another in such a way that when the opposing open ends ( 24 ) of the cylinder shell parts ( 21a . 21b ) the free ends ( 23 ) move away from each other. Clamping system according to claim 1, characterized in that the connecting means ( 25 ) is formed as a bow-shaped, wherein each cylinder part shell ( 21a . 21b ) at its free end ( 23 ) with a cylinder axis (A) directed spring force of a leg ( 25a . 25b ) of the connecting agent ( 25 ) is acted upon. Clamping system according to claim 1 or 2, characterized in that the expansion element ( 20 ) at its open end ( 24 ) an inwardly directed collar ( 26 ) with which a corresponding paragraph ( 49 ) of the clamping bolt ( 40 ) and thus the expansion element ( 20 ) with the clamping bolt ( 40 ) is latched. Clamping system according to claim 3, characterized in that the collar ( 26 ) of the expansion element ( 20 ) a slope ( 27 ) leading to the open end ( 24 ) is inclined so that upon removal of the expansion element ( 20 ) a tool over the slope ( 27 ) from the inside of the expansion element ( 20 ) under slight and permanent spreading of the expansion element ( 20 ) is herausführbar. Clamping system according to one of the preceding claims, characterized in that the clamping bolt ( 40 ) along its longitudinal extent from the shoulder ( 49 ) starting on one side as a threaded part ( 42 ) with an external thread ( 41 ) and on another side as a plug-in part ( 43 ) with means ( 46 ) for positive connection with a receiving element ( 30 ) is trained. Clamping system according to claim 5, characterized in that the clamping bolt ( 40 ) with a plug-in part ( 43 ) in the inner tube ( 11 ) receiving element ( 30 ) is held. Clamping system according to one of the preceding claims, characterized in that the clamping bolt ( 40 ) has a left-hand thread. Clamping system according to one of the preceding claims, characterized in that in the assembled state between the open end of the expansion element ( 24 ) on its plug-in part-side end face and a free end face (FIG. 33 ) of the receiving element ( 30 ) a minimum distance ( 15 ) of at least 100 microns. Clamping system according to one of the preceding claims, characterized in that the clamping bolt ( 40 ) in the plug-in part ( 43 diametrically opposed, radially projecting guide means ( 46a . 46b ), which in corresponding recesses ( 36a . 36b ) of the receiving part ( 30 ) for the positive connection of the clamping bolt ( 40 ) with the receiving part ( 30 ) are provided. Clamping system according to one of the preceding claims, characterized in that the expansion cone ( 50 ) with a conical outer surface ( 54 ) is formed with a larger diameter and a smaller diameter end ( 52 . 53 ) and with laterally at least two projecting guide elements ( 51a . 51b ) for intervening in corresponding columns ( 29 ) of the expansion element ( 20 ) between the cylinder shell parts ( 21a . 21b ), wherein the guide elements ( 51a . 51b ) with their outer surfaces ( 56a . 56b ) have a radial distance from each other equal to the diameter of the larger end ( 52 ) of the spreading cone ( 50 ). Clamping system according to one of the preceding claims, characterized in that an axial extension of the expansion cone ( 50 ) equal to or shorter than the threaded portion ( 42 ) of the clamping bolt ( 40 ). Spreading element for a clamping system for axially fixing the position of an outer tube ( 12 ) against a telescopic into the outer tube ( 12 ) retractable inner tube ( 11 ) according to one of the preceding claims, characterized in that a cylindrical base body in at least two cylindrical shell parts ( 21a . 21b ) is divided longitudinally, wherein the cylinder shell parts ( 21a . 21b ) at one end ( 23 ) with a connecting means ( 25 ) are connected so that they are at a spreading movement at the opposite end ( 24 ) are movable away from each other. Spreading element according to claim 12, characterized in that the connecting means ( 25 ) is designed as a virtually circular bracket, each with a leg ( 25a . 25b ) at each free end ( 23 ) of the cylinder shell parts ( 21a . 21b ) attacks and with its diameter from the free end ( 23 ) extends axially away. Spreading element according to claim 12 or 13, characterized in that on the said connecting means ( 25 ) opposite end ( 24 ) an inwardly directed collar ( 26 ) is arranged, whose to the connecting means ( 25 ) pointing inner surface one to the end ( 24 inclined slope ( 27 ) having. Spreading element according to one of claims 12 to 14, characterized in that recesses ( 28 ) are formed so that between the recesses ( 28 ) Webs ( 28a . 28b ) remain as a contact surface. Spreading element according to one of claims 12 to 15, characterized in that the base body formed of plastic is. Spreader cone for a clamping system for axially fixing the position of an outer tube ( 12 ) against a telescopic into the outer tube ( 12 ) retractable inner tube ( 11 ) according to one of claims 1 to 11, characterized by a conical outer surface ( 54 ) with a larger diameter and a smaller diameter end ( 52 . 53 ) and with at least two laterally projecting, axially extending guide elements ( 51a . 51b ), wherein the guide elements ( 51a . 51b ) with their outer surfaces ( 56a . 56b ) have a radia len distance from each other equal to the diameter of the larger end ( 52 ) of the spreading cone ( 50 ). Expanding cone according to claim 17, characterized by an internal thread formed as a left-hand thread ( 55 ). Clamping bolt for a clamping system for axially fixing the position of an outer tube ( 12 ) against a telescopic into the outer tube ( 12 ) retractable inner tube ( 11 ) according to one of claims 1 to 11, characterized in that starting from a larger diameter paragraph ( 49 ) at these along a longitudinal extent on one side of a threaded part ( 42 ) with left-hand thread and on an opposite side a plug-in part ( 43 ) at closes, whereby the plug-in part ( 43 diametrically opposed, radially projecting guide means ( 46a . 46b ) for positive connection with a receiving part ( 30 ) having. Clamping bolt according to claim 19, characterized in that at the transition from the paragraph ( 49 ) to the plug-in part ( 43 ) a cylindrical neck ( 48 ), the diameter smaller than the paragraph ( 49 ) and larger in diameter than the male part ( 43 ) is trained. Clamping bolt according to claim 19 or 20, characterized by an embodiment as a pressed part. Receiving element for a clamping bolt for a clamping system for axially fixing the position of an outer tube ( 12 ) against a telescopic into the outer tube ( 12 ) retractable inner tube ( 11 ) according to one of claims 1 to 11, characterized in that a central bore ( 35 ) is provided with at least two diametrically arranged recesses ( 36a . 36b ) for the positive acceptance of corresponding guide means ( 46a . 46b ) of a clamping bolt ( 40 ). Receiving element according to claim 22, characterized in that on an end face ( 33 ) a larger bridge ( 31 ) is trained. Receiving element according to claim 22 or 23, characterized in that on one of the front side ( 33 ) opposite end ( 32 ) a recess ( 34 ) for spreading a plug-in part ( 43 ) of a clamping bolt ( 40 ) is trained. Length-adjustable tube with a clamping system for axially fixing the position of an outer tube ( 12 ) against a telescopic into the outer tube ( 12 ) retractable inner tube ( 11 ) according to one of claims 1 to 11, characterized in that a spreading element ( 20 ) of at least two longitudinally divided cylinder shell parts ( 21a . 21b ) in the outer tube ( 12 ), which cylinder shell parts ( 21a . 21b ) at their respective one free end ( 23 ) with a connecting means ( 25 ) are connected to one another in such a way that by a spreading cone ( 50 ) caused radial disengagement of the opposite open ends (FIG. 24 ) of the cylinder shell parts ( 21a . 21b ) the free ends ( 23 ) move away from each other, and that a clamping bolt ( 40 ) with its threaded part having a left-hand thread ( 42 ) in the expansion element ( 20 ) Spreizkegel ( 50 ) intervenes. Length-adjustable tube according to claim 25, characterized in that in the inner tube ( 11 ) a receiving element ( 30 ) is inserted, in which the clamping bolt ( 40 ) with its plug-in part ( 43 ) is inserted positively. Method for mounting a clamping system according to one of claims 1 to 11 in a length-adjustable tube with an outer tube ( 12 ) and a telescopic into the outer tube ( 12 ) retractable inner tube ( 11 ), characterized by the following steps: a clamping bolt ( 40 ) with his with guidance ( 46a . 46b ) provided plug-in part ( 43 ) into a hole ( 35 ) of a receiving element ( 30 ) with corresponding recesses ( 36a . 36b ) and positively connected, at an end piece ( 45 ) of the plug-in part ( 43 ), the clamping bolt ( 40 ) with the receiving element ( 30 ), that with the clamping bolt ( 40 ) equipped receiving element ( 30 ) is in the inner tube ( 11 ), the receiving element ( 30 ) is connected to the inner tube ( 11 ), a spreader cone ( 50 ) is on the clamping bolt ( 40 ) on the threaded part ( 42 ) until the expansion cone ( 50 ) on a larger scale paragraph ( 49 ) of the clamping bolt ( 40 ) comes to the plant, a spreading element ( 20 ) is spread over the expansion cone ( 50 ) from its free end ( 53 ) until one at its open end ( 24 ) inward collar ( 26 ) on the paragraph ( 49 ) and the expansion element ( 20 ) is in the outer tube ( 12 ) introduced. Method according to Claim 27, characterized that the steps are carried out essentially by machine. A method according to claim 27 or 28, characterized in that the expansion cone ( 50 ) is supplied in a cylindrical tube to its mounting position. Method according to one of claims 27 to 29, characterized in that the expansion element ( 20 ) is set to a band-like delivery means which is written in columns ( 29 ) between cylindrical shell parts ( 21a . 21b ) of the expansion element ( 20 ) engages and on this to the with the expanding cone ( 50 ), the clamping bolt ( 40 ) and the receiving element ( 30 ) equipped inner tube ( 11 ) is transported in a mounting position and there taken over by a stamping device of the feeding means and the spreading cone ( 50 ) is pushed. Method according to one of claims 27 to 30, characterized in that the expansion element ( 20 ) is mounted in a slight spread position, so that when inserting into the outer tube ( 12 ) the clamping system ( 10 ) is ready to start immediately.