EP0566045B2 - Adjustable column, particularly for chairs - Google Patents

Description

The invention relates to a column unit, in particular Chair column unit, comprising a base tube with a base tube axis, a first base tube end, a second base tube end and inserted into the base tube Management resources in the area of the second Base tube end, further comprising a positioning device with a device axis, which essentially with the base tube axis coincides with a first sub-group unit and a second subgroup unit, these subgroup units axially to one another movable and in a plurality of axial relative positions can be blocked against each other, whereby further the first sub-group unit on one with the base tube connected support means in relation to the base tube supported essentially axially immovable and is rotatable relative to this support means wherein the second subgroup unit furthermore about the second base tube end extends and between an innermost position and an outermost position is adjustable relative to the second base tube end, an outer section of the second subgroup unit, which is over the second base pipe end and extends beyond the guide means and to Connection with a column-supported object is formed, and wherein the second sub-group unit in axially sliding engagement with the guide means stands.

Such a column unit is for example known from DE-PS 19 31 012 and from the US-PS 4,848,524. In the known embodiments, the have proven themselves in practice, they are Leadership means over the second, i.e. H. the upper Base tube end axially fixed. It can the problem arises that the upper, i.e. H. the second Subgroup unit insufficient lead length possesses more of the management means if the second Subgroup unit is in its outermost position. This problem cannot be solved simply by that be solved that the length of the base tube with unchanged Positioning device is extended, because such an extension of the base tube could possibly to limit the stroke of the positioning device lead so that due to the Training of the positioning device itself possible shortest position of the column unit no longer reached could be.

Furthermore, a column unit mentioned above is from the DE-A 621 149 known. With this column unit the outward movement of the guide means opposite the second base pipe end by interacting, attached to the guide means and to the base tube Lifting gear to be limited is limited. The sling to be limited is fixed integrated into the guide means and when moving outwards the guide means over the second Base tube end cannot be overcome.

The invention is therefore based on the object of providing a column unit which, on the one hand, with almost complete utilization of the base tube length, in order to enable a stroke of the positioning device which approximately corresponds to the base tube length, this positioning device by means of the second subgroup unit even in the outermost position of the second subgroup unit has sufficient guide length within the guide, and which, on the other hand, enables simple maintenance, for example the simple removal of components (such as the positioning device or associated guide means)
To achieve this object, the column unit defined in claim 1 is proposed.

Characterized in that the guide means are axially displaceable are opposite the base tube and that the guide means from the second sub-group unit when it moves outward between their innermost and their extreme position taken on a partial route the guide length of the second subgroup unit adjusts inevitably to the length setting of the positioning device.

But if the guide means "axially floating" are attached to the second base tube end, there could be a risk that the management means disengage from the base tube if that Positioning device fully or partially in the direction of the outermost position is extended. This could in particular then happen when the leadership means in essentially incorporated into the base tube without friction and if in such an embodiment the column unit is turned upside down so that you Originally the top end of the object at the bottom lies. The case of leadership loss of leadership on the base tube could also occur if, for example, when cleaning by wiping along the base tube the guide means be taken and taken along in the pull-out direction. To prevent this possibility is the outward movement the guide means over the second Base tube end by interacting, on the guide means and limiters attached to the base tube Sling gear limited.

It is recommended that the marginalized Sling means are arranged so that they are a determine the axially outer limit position of the guide means, in which the second subgroup unit, if this in the outermost position compared to the second Base tube end is optimally supported on the base tube is; for example, this means the following: if the second subgroup unit in its outermost Position, it should be on approximately half their length in the base tube, and on the other hand the other half of its length should be about the second Extend the base tube end and the second sub-group unit to lead. In this way it is possible the second Subgroup unit without loss of sufficient Extend the guide so far that the first base tube end facing end of the second subgroup unit itself in the area of the second base tube end or is even outside the second base tube end.

There is occasionally a need for a column unit in particular a chair column unit, the Replace gas spring. For this purpose the operationally first subgroup unit easily removable with the associated support means. This means, that the positioning device is easily removed from the column can be. In connection with the expansion the positioning device from the base tube now comes occasionally, especially if it is present of lifting gear on the positioning device and the management tools, the demand to remove the guide means from the base tube, for example, worn guide means to renew or to adapt to a changed one Dimensioning the positioning device another Use leadership tools. Now the possibility an exchange of the management means not make it more difficult that the lifting gear to be excluded are present is according to the invention provided that the pull-out limiting effect the lifting equipment to be limited can be overcome is.

There are different options here: Man can provide that the pull-out limiting effect the lifting gear to be limited by applying a predetermined minimum pull-out force on the guide means can be switched off.

This basic possibility can be found in the Way that the excluded A sling limit stop on the base pipe side and a guide means side Excerpt limit stop include, the Extension limit stop on the guide side from one to one inside the base tube End area of the guide means attached extension limiting ring is formed, which is created when the predetermined minimum extraction force or a larger one Pull-out force on the guide means through interaction with the extension stop on the base tube side is stripped from the guide means. It is possible that the extension limiting ring elastically expandable and in a ring recess on one Outer peripheral surface of the guide means added is. It is also possible that the base tube side Extension limit stop from one to the first Base tube end facing one into the second Base tube end axially immovable centering tube is formed.

Another preferred option is that the lifting gear to be limited by mere Apply an axial pull-out force to the guide means are generally unsolvable, but by at least one from the creation of a pull-out force different solution measures ineffective feasible are. This possibility has compared to the first discussed Possibility the advantage that the pull-out limiting effect of the sling gear to be excluded can also absorb very large pull-out forces without the intention of expanding the management means these are created and that on the other hand with existing Intent of expanding the management means with can be solved with little effort. this The design principle is now again arranged in a wide variety of ways Possibilities under.

For example, it is possible that the ones to be excluded Sling one essentially axially extending slot in the base tube and one in engaging the slot with the guide means for common axial movement connected slot engaging member include, which with a slot end limiting the outward movement of the guide means cooperates and can be disengaged from the slot. It is conceivable that the slot engaging member of the guide means is detachable, or that that Slot engaging member opposite the guide means is elastically displaceable when emerging from the slot.

Another possibility is that the guide means are rotatable relative to the base tube and that the lifting gear to be limited by Twisting the guide means in a certain angular position range releasable relative to the base tube or can be brought into a readiness for release.

This possibility can be realized in this way, for example that the lifting gear to be excluded an annular one attached below the base tube and substantially axially towards the first base tube end directed stop edge and one on the guide means attached, substantially radially inward against elastic restoring force from an active position counter stop adjustable in a release position include which when twisting the guide means towards the predetermined angular position range brought into a release position by cam means becomes.

Another implementation possibility exists in that the lifting gear to be excluded is a annular and attached within the base tube essentially axially towards the first base tube end directed stop edge and one on the guide means attached, substantially radially inward against elastic restoring force from an active position counter stop adjustable in a release position include which when twisting the guide means in the predetermined angular position range in the ready-to-release position arrives and at a subsequent one axial extraction movement of the guide means from the Base tube - if necessary, only after a partial extension movement subsequent twisting again the guide means opposite the base tube - can be disengaged into its release position by cam action is. This latter possibility of realization can go be further developed that the stop edge has a recess owns and that adjacent to this recess to cooperate on the base tube cam means are provided with the counterstop, which after the introduction of the counterpart in the Recess with subsequent relative movement of the Guide means a flyover relative to the base tube the counter-stop in the release position. The cam means can either be arranged in this way be the counterstop when it is inside the recess is by axial extension the guide means can be transferred into the release position, or '' they can be arranged in such a way that the counter-stop, when it is inside the recess, by twisting the guide means opposite the base tube can be moved into the release position. Also the Combined application of the two cam arrangement options is conceivable.

To without complicated machining of the base tube provide a stop edge in a simple manner can be provided that the stop edge and the cam means on one in the base tube in the Area of the second base tube inserted centering tube are trained. The centering tube Like the guide means, it can be used as an im Injection molding process easily manufactured. Molding, in particular Plastic molding, be formed.

A particularly inexpensive option for one Provision of the counterpart is that the counter stop of a section, e.g. B. end section, a wire bracket is formed, which on a Outer peripheral surface of the guide means in an annular Receiving trough is inserted, this Section in the area of an annular trough cutting notch of the guide means against elastic Force displaceable radially inwards into the release position is. It is possible that the section of the wire bracket fixed non-rotatably on the guide means and by twisting the guide means opposite the base tube in the angular range of a recess the stop edge is rotatable and that adjacent to this recess on the base tube cam means are provided, which after the introduction of the Section in the recess by subsequent Relative movement of the guide means compared to that Move the section of the base tube into the release position. The non-rotatable fixing of the wire bracket can can be achieved in the simplest way that this wire bracket at its from the end section far end is formed into a hook which engages in the notch to prevent rotation.

The cam means can in particular be such be arranged that the section of the wire bracket after insertion into the recess by rotating the Guide means relative to the base tube in the release position is transferable. There is then the following handling option for the expansion of the management means: The guide means are attached to them with the Counterstop rotated during this Stop abuts the stop edge. Once the Counter stop in the angular area of the recess arrives, the operator feels the coincidence of the Counter-stop, d. H. of the wire bracket end with the In any case, recess if he during the Rotational movement a slight force in the pull-out direction exercises the means of leadership. Once he has this coincidence he has felt that he is now pulling out can exercise on the leadership means. So that arrives then the counterstop, about the section of the Wire bracket, in the area of the recess. Now depending on the cam design of the recess border of the counterstop in Release position can be transferred by either a Traction or torque on the guide means is created. By designing the spring properties of the counterstop and by designing the cam means can be in the singular angular range a relatively low force the counterstop are transferred to the release position, the Dimensioning the pull-out force or the one to be used Torque is set so that this too singular angular range still some resistance counteracts the release of the counter-stop, on the other hand but still loosening by hand without any special Tools is possible. It becomes one for practice adequate security against unintentional undressing the leadership means achieved because on the one hand it is very unlikely that the leadership means at all comes into the singular angular range, since this is very small compared to the total size of the Stop edge. On the other hand, this is also singular Angular range a certain force or a certain Apply moment to the counter stop in the release position convert.

To use a wire bracket in the rotating area a highly effective outside the singular angular range Ensure extension limit, even with relatively weak spring wire brackets, it is recommended that the section of the wire bracket when setting in an angular range outside the Recess in a radial space between the stop edge and an inner peripheral surface of the Interlocking base tube engages. The hooking can easily made possible by a 180 ° bend of the spring wire that is difficult to undo. The radial space can be between one centering tube inserted into the second base tube end and an inner peripheral surface of the base tube be formed by spacing means.

The guide means can be in at least one axial Direction of movement through frictional engagement with the second subgroup unit be portable. alternative it is possible that the guide means in at least an axial direction of movement by entraining Sling from the second subgroup unit with Movement play are portable. A preferred embodiment is that the leadership means at least in the direction of movement from the base tube out with lifting gear with play be taken along so that they can be extended of the positioning device in any case get into their leading position in time. A later inward movement can turn with lifting gear. This is on the one hand the outer end of the guide means and on the other hand a ring collar on the second sub-group unit available, this ring collar in the simplest case from the lower end of the from the Pillar, such as a seat mounting hub, can be formed. This means that the guide means in the axial direction between two the second subgroup unit, entraining Stops are movable. Then it turns up The need for detachability of the guide means from the base tube in particular to the positioning device bring out of the base tube at all to be able to do this, together with the management tools. Once the positioning device has been removed, so can then follow the leadership of the Positioning device can be easily pulled off because then the one taking the guide means outwards Access is accessible and from the second sub-group unit can be solved. A particularly cheap one Design for a guide means Lifting equipment that is taken away from the vehicle exists according to Claim 26 in that on one of the first Base tube end facing end section of the second Subgroup unit attached a spring steel claw ring is softer when the second axially moves outward Subgroup unit opposite the base tube on one Driving area of the guide means comes to the system. Such a claw ring is usually from the second Subgroup unit not removable by axial force, on the other hand, as soon as it is accessible, by a Easily removable tool. The claw ring can with the free ends of his claws at about one cylindrical outer peripheral surface of one end of the attack second subgroup unit. The claws load-bearing ring part then lies radially on the outside, in such a way that he has a shoulder surface between a radial inner guide surface of the guide means and one diameter larger recess in the stop action comes, this recess the claw ring offers a clear path over a partial length of the guide means.

The application of the claw ring is not at that The presence of lifting gear to be limited bound but can also be applied if not such a stroke-limiting pulling device available.

Furthermore, the application of the exclusion is Sling not bound by the fact that the first Subgroup unit compared to the base tube in is supported essentially axially immovably. Much more are such slings to be limited to be used with advantage if the first subgroup unit on a height-adjustable platform supports, the height of which is determined by a pulley which is due to the relative movement of the two subgroup units is controlled.

Fig. 1

eine erste Bauform einer erfindungsgemäßen Säuleneinheit;

Fig. 2

eine zweite Bauform einer erfindungsgemäßen Säuleneinheit;

Fig. 3

eine dritte Ausführungsform einer erfindungsgemäßen Säuleneinheit;

Fig. 4

eine vierte Ausführungsform einer erfindungsgemäßen Säuleneinheit;

Fig. 5

eine Teilansicht einer Abwandlung zu der Ausführungsform nach Fig. 4;

Fig. 6, 7 und 8

eine abgewandelte Ausführungsform des Drahtbügels gemäß Fig. 5.

The accompanying figures explain the invention using exemplary embodiments. They represent:

Fig. 1

a first design of a column unit according to the invention;

Fig. 2

a second design of a column unit according to the invention;

Fig. 3

a third embodiment of a column unit according to the invention;

Fig. 4

a fourth embodiment of a column unit according to the invention;

Fig. 5

a partial view of a modification to the embodiment of FIG. 4;

6, 7 and 8

a modified embodiment of the wire bracket according to FIG. 5.

In Fig. 1, a base tube is designated 10. This Base tube has a first or lower end 10a and a second or upper end 10b. On the coat of the Base tube 10, a conical section 10c is provided, the one for inserting the base tube into a carrier, z. B. a chair cross (not shown) is determined. In a centering tube 12 is inserted into the upper end 10b. This centering tube 12 is through an annular flange 12a centered in the base tube 10 and through a radial flange 12b on the upper end 10b of the Base tube supported. Furthermore, the centering tube 12 an inner jacket 12c, which by radial ribs 12d on the inner peripheral surface of the base tube 10 is supported radially. The centering tube 12 is by at least one notch pin 12e on the base tube 10 axially and circumferentially secured.

In the centering tube 12 is a guide sleeve 14 used. This guide sleeve has on its upper End on a radially outwardly projecting collar 14a, which for stop engagement with the upper end 12f of the centering tube is formed. At her bottom At the end, an annular recess 14b is embedded in the guide sleeve, which has an elastically expandable extension limiting ring 16 records. This Extension limiting ring 16 stands on a lower end edge 12g of the centering tube 12 in the axial direction across from. It can be seen that the guide sleeve on a limited path axially opposite the centering tube 12 is displaceable. A lower one or one The basic position of the guide sleeve 14 is thereby determines that the collar 14a on the upper end 12f the centering tube 12 rests. An upper or is the outer end position of the guide sleeve 14 determines that the extension limiting ring 16 on the Bottom edge 12g of the centering tube 12 rests.

A gas spring 18 is provided. This gas spring 18 includes as a first or lower subset a piston rod 18a. It also includes as one upper or second sub-group unit a cylinder 18b. The piston rod 18a is by a guide and Sealing unit 18c in the cavity 18d of the cylinder 18b introduced and carries a within the cylinder Piston assembly 18e which defines cavity 18d in divided into two working chambers 18d1 and 18d2. The two Working chambers 18d1 and 18d2 are separated by one Ring channel 18f interconnected. This connection can be shut off by a valve body 18g, which through within cavity 18d prevailing gas pressure is cocked in the closed position and sealed and displaceable by a shaft 18h is led. By depressing the shaft 18h and thus the valve body 18g can connect between the two working chambers 18d1 and 18d2 become. The lower end of the piston rod 18a is by a thrust ball bearing 18i on a support wall 20th supported, which is firmly connected to the base tube 10 is. Here is a lower end extension 18k of the piston rod 18a through a hole 20a of the support wall 20 and axially fixed by a split pin 181. The end extension 18k has a slight radial Play in hole 20a.

The cylinder 18b has an outer peripheral surface 18m on an inner peripheral surface 14e of the guide sleeve 14 out. On the other hand, it is Guide sleeve 14 with an outer peripheral surface 14f on an inner peripheral surface 12i of the centering tube 12 out.

The cylinder 18b is at its upper end area designed as a cone 18n. On this cone 18n is with a corresponding hollow cone, a hub body 22 a seat carrier attached. In the hub body 22 is a release lever 24 about a pivot axis 24a in the drawing plane is pivoted. This release lever 24 penetrates the conical section 18n of the Cylinder 18b and acts on the pan with a pan 24b Valve stem 18h on.

In Fig. 1, the gas spring is in its outermost Position, d. H. the piston rod 18a is located in its outermost position relative to the cylinder 18b. This extreme position is due to an elastic Stop ring 18o fixed.

After opening the valve body 18g, the cylinder can 18b are pushed down against gas pressure, until the piston unit 18e in the range of Valve body 18g arrives and there if necessary by an insertion limit stop, not shown defines an innermost position.

At the lower end of the cylinder 18b in the area the guide and seal unit 18c is a claw ring 26 attached, with its claws 26a on one Outer peripheral surface 18p of the cylinder 18b is clawed. An annular disk 26b carrying the claws 26a is located himself in stop engagement with a ring shoulder 14g, the at the transition between the inner peripheral surface 14e the guide sleeve and the inner peripheral surface 14h an annular recess 14i of the guide sleeve 14 is formed is. It can be seen that the cylinder 18b at the transition in its outermost position shown in FIG. 1 About the claw ring 26, the guide sleeve 14 in the illustrated Position. In this position it is lower end of the cylinder 18b to about the Height of the upper end 10b of the base tube 10. Nevertheless is sufficient guidance and centering of the Cylinder 18b guaranteed because, on the one hand, the cylinder 18b on the peripheral surface 14e of the guide sleeve 14 and also the lower part of the guide sleeve 14 with its outer peripheral surface 14f of the inner peripheral surface 12i of the centering tube 12 abuts.

After opening the valve body 18g again the cylinder against the effect of gas pressure on the Cross section of the piston rod are pressed down, being gas between the two working chambers 18d1 and 18d2 passes over. With such a downward movement of the cylinder 18b, the guide sleeve 14 falls, which is loose and practical in the centering tube 12 is guided smoothly, under the action of gravity downward, being in contact with the claw ring 26 remains. As soon as the collar 14a of the guide sleeve 14 against the upper end 12f of the centering tube 12 strikes, the guide sleeve 14 stops, and the Cylinder 18b can be pushed further down, until the lower end surface 22a of the hub body 22 against the upper end surface 14k of the guide sleeve 14 comes across. This is the lowest position of the cylinder 18b corresponding to the innermost position of the piston rod 18a reached compared to the cylinder 18b. It is also conceivable that the guide sleeve 14 in the centering tube 12 is guided with a friction, which a sagging of the guide sleeve 14 under the effect counteracts gravity, so that the guide sleeve 14 with a downward movement of the Cylinder 18b initially shown in FIG. 1 Position remains and only then taken down when the lower end surface 22a against the upper end surface 14k of the guide sleeve 14 abuts and then takes it down. The position of the cylinder 18b opposite the piston rod 18a can be in any intermediate position by closing the valve body 18g can be blocked.

It can be seen that also shown in FIG. 1 uppermost position of the cylinder 18b the guide sleeve 14 not substantially from their in Fig. 1st shown extreme position pulled up can be: the pull-out limitation ring 16 opposite, against the lower edge 12g of the centering tube 12 comes into play. This ensures that the guide sleeve 14 in any case in the critical uppermost position of the cylinder 18b in the Fig. 1 position shown optimal guidance and centering cannot leave for the cylinder 18b.

To remove the gas spring 18 from the base tube 10 the split pin 181 is released. The gas spring can then not yet pulled out of the base tube 10, because with the claw ring 26 on the shoulder surface 14g the guide sleeve 14 abuts and on the other hand the guide sleeve with the pull-out limiting ring 16 against the lower edge 12g of the centering tube 12 abuts. The Elasticity of the extension limiting ring 16 and the The depth of the annular recess 14b are coordinated with one another that the extension limiting ring 16 with a predetermined minimum pull-out force from the lower End of the guide sleeve 14 can be stripped. This minimum pull-out force is such that the pull-out limiting ring 16 from the guide sleeve 14 is stripped before the claw ring 26 is about releases from the cylinder 18b. As soon as the extension limiting ring 16 is stripped from the guide sleeve 14, can the cylinder 18b with the guide sleeve 14 the base tube 10 are pulled out. Subsequently can then the claw ring 26 by means of a screwdriver or the like from the lower end 18p of the Cylinder 18b are released. A replacement of one Gas spring or a guide sleeve is in this embodiment only possible in such a way that that too Centering tube 12 is released and reinstalled. However, one could think of the pull-out limiting ring 16 so to store in the annular recess 14b and a guide cone at the upper end of the inner jacket 12c to provide for the pullout limit ring 16 inserted under radial compression can be until it falls below the lower edge 12g of the centering tube 12 again in an effective Stop position occurs.

2 are analog Provide parts with the same reference numerals as in the Embodiment according to FIG. 1, increased by the number 100.

Different from the embodiment 1 are only the means that the excessive Extraction of the guide sleeve 114 from the base tube 110 prevent. A pull-out limiting pin can be seen in FIG. 2 116, which, under the action of one at the Guide sleeve 114 supported leaf spring 116a in a Elongated hole 110e engages. The pull-out limit pin 116 acts with the upper end 110f of the elongated hole 110e together and prevents unintentional undressing the guide sleeve 114 from the base tube 110. If it is necessary in the course of finishing work turns out, the pullout limit pin 116 through a screwdriver or the like opposite to the one carrying it Guide sleeve 114 shifted radially inward be what the guide sleeve 114 from the base tube 110 can be deducted.

Otherwise, the embodiment corresponds to FIG. 2 according to the structure and mode of operation of those according to FIG. 1.

In the embodiment according to FIG. 3, analog parts are again provided with the same reference numerals as in the embodiment according to FIG. 1, each increased by the number 200. In this embodiment, the pull-out limiting pin 216 already known from FIG. 2 can be seen, which is characterized by the Leaf spring 216a is biased into an active position. This pull-out limiting pin can be rotated by turning the guide sleeve 214 into the narrow angular range of a downward extension 212 m. This extension 212m is provided with cam surfaces 212n at its edges, so that when the extension limiting pin 216 is rotated from its position in FIG. 3 in radial alignment with the extension 212m, the extension limiting pin 216 is pushed radially inward into a release position, so that the Guide sleeve 214 can then be easily pulled out in the axial direction.
A pull-out is therefore only possible in a limited angular range of the rotational path of the guide sleeve 214, which occurs in extremely rare cases for statistical reasons alone. Furthermore, the release position cannot be reached accidentally because a certain torque has to be overcome when the pull-out limiting pin 216 slides onto one of the two cam surfaces 212n. This torque is adjusted by coordinating the spring force of the leaf spring 216a and the inclination of the cam surfaces 212n such that on the one hand an unintentional adjustment of the pull-out limiting pin 216 in radial alignment with the extension 212m is not expected, but on the other hand in preparation for an intended release of the guide sleeve 214 by a comparatively small torque to be applied by hand allows the pull-out limiting pin 216 to slide onto the extension 212 m.

4 are analog Provide parts with the same reference numerals as in the Embodiment according to Fig. 1, each increased by Number 300.

4 differs 3 only in that instead of Extension 212m of the centering tube 212 on the Centering tube 312 in its lower edge 312g recess 312m is installed, which is framed by cam surfaces 312n and 312o. A solution is possible here that the pull-out limiting pin 316 along the bottom edge 312g first turned into the area of the recess 312m and that the pull-out limiting pin 316 is axially pulled over the cam surface 312o or by rotating the guide sleeve 314 with respect to the centering tube 312 over one of the cam surfaces Turned 312n away and in the release position is pushed back.

5 are analog Provide parts with the same reference numerals as in the Embodiment according to Fig. 1, each increased by Number 400.

5 differs from that of FIG. 4 by a different embodiment of the counterstop: in place of the pull-out limiting pin 316 is an end portion 416c of one Wire bracket 416b kicked. This wire bracket 416b is in a ring trough 414m on the outer circumferential surface 414f of the guide sleeve 414 inserted. In the circumferential direction the wire bracket 416b is secured by a Tail 416d of wire bracket 416b into a notch 414n intervening. The wire bracket is in the radial direction 416b through the plant on the inner circumferential surface 412i of the centering tube 412 secured. The notch 414n cuts the ring trough 414m, so that in the Area of this notch is the end portion 416c of the wire bracket 416b is exposed radially inward and radially inward can be resiliently bent.

The end portion 416c is with an end hook 416i provided that around the lower edge 412g of the centering tube 412 reach around and into the spaces 430 between the base pipe 410 and the Engage the inner jacket 412c of the centering tube 412 can, as the guide sleeve 414 upwards, d. H. to is pulled outside and the end portion of the wire bracket in the area of the lower edge 412g of the centering tube 412 arrives. Only if the Angular guide sleeve 414 to the centering tube 412 is set that the end portion 416c with the angular range of the recess coincides 412m, the end portion 416c occurs upon an upward shift the guide sleeve 414 into the recess 412m a. If this has happened, one can subsequently rotating the guide sleeve 414 opposite the centering tube 412 the end section 416c or its end hook 416i in engagement with one of the Cam surfaces 412n arrive, so that the end section 416c then radially inward in the area of the notch 414n can be pressed by the end hook 416i over one of the cam surfaces 412n is pulled away. Then the guide sleeve 414 can then be freely be subtracted upwards. With different shaped end hook 416i could also be a Interaction of this end hook with the cam surface 412o be possible, so that by purely axial deduction the end hook radially inwards into its release position could be moved.

In the embodiment described here is a unintentional loosening of the guide sleeve 414 the centering tube 412 is particularly unlikely if the spacing ribs 412d to the bottom edge 412g are continued because then the recess 412m by gradually turning the guide sleeve 414 and pull-out attempt after turning must first be determined. To an accidental Dismantle the guide sleeve 414 again To make the cam surfaces less likely Modify 412n in the recess 412m in such a way that that only a single effective cam surface 412n1 is formed the other cam surface 412n2 is omitted. The release position can only be reached if the end portion 416c on the effective cam surface 412n1 is pushed on, i.e. turning the guide sleeve 414 has a certain direction.

The end hook 416i of the wire bracket 416b can do this be bent so that after reaching the release position when pulling out the guide sleeve 414 from the Centering tube 412 or when installing and thus when Insert the guide bush 414 into the centering tube 412 neither damage nor clamping effects caused in the centering tube 412.

The embodiment shown in Fig. 5 draws through a particularly cost-effective production and a special pull-out security.

6, 7 and 8 is another embodiment of the wire bracket shown. Fig. 6 shows a top view on the wire bracket, Fig. 7 is a side view in Arrow direction VII of FIGS. 6 and 8 is a side view in the direction of arrow VIII of FIG. 7. The wire bracket is total designated 516b. This wire bracket points a slot 516f so that it is easily expanded placed in the ring recess corresponding to 414m of FIG. 5 can be. Diametrically opposite the slot is a hooked portion 516g arranged. This hook jumps, as can be seen in FIG. 6, at 516h radially inwards into the circumference of the wire bracket 516b.

The wire clip 516b is inserted into the guide sleeve 414f 5 inserted so that the hook-like Section 516g projects down. Here comes the Protrusion 516h to lie in the notch 414n so that the Wire bracket 516b cannot be rotated in the ring recess 414m is set.

When the guide sleeve 414 facing the centering tube 412 is set so that the hook 516g is located outside the recess 412m, so hooked the hook 516g with its radially outer End 516k with the stop edge 412g of the centering tube 412 and can reach into the space 430. On the other hand, the hook 516g is in the Area of the recess 412m, so by turning the guide sleeve 414 and thus the hook 516g this through one of the cam surfaces 412n1 and 412n2, preferably only through one, radially inward into the notch 414n are pressed into the guide sleeve 414, so that subsequently the guide sleeve 414 with the wire bracket 516b pulled out of the centering tube 412 can be.

Claims (28)

1. Column unit, in particular a chair column unit, comprising a base tube (10) with a base-tube axis (AA), a first base-tube end (10a), a second base-tube end (10b) and guides (14) inserted into the base tube (10) in the region of the second base-tube end (10b); further comprising a positioning device (18) with a device axis which substantially coincides with base tube axis (AA), with a first component-group unit (18a) and a second component-group unit (18b), wherein these component-group units (18a,18b) are movable axially to each other and are lockable in a plurality of relative axial positions against each other,
      wherein, furthermore, the first component-group unit (18a) is supported on a support (20) connected to the base tube (10) in a manner such as to be substantially immovable axially with respect to base tube (10) and which is rotatable with respect to said support (20),
      wherein, furthermore, the second component-group unit (18b) extends beyond the second base-tube end (10b) and is adjustable between an innermost position and an outermost position with respect to the second base-tube end (10b);
      wherein, furthermore, an outer section (18n) of the second component-group unit (18b), which extends beyond the second base-tube end (10b) and beyond the guides (14), is designed to connect with a column-mounted object (22),
      and wherein the second component-group unit (18b) is in axially sliding engagement with the guides (14), having the following features:

   a) the guides (14) are guided along base tube (10) in an axially shiftable manner;

   b) when the second component-group unit (18b) moves outwards between its innermost position and its outermost position, the guides (14) are capable of being driven thereby on a partial path;

   (c) the outward movement of the guides (14) with respect to the second base-tube end (10b) is restricted by co-operating pullout-restricting stops (16,12g) mounted on the guides (14) and on the base tube (10);

   d) the pullout-restricting action of the puliout-restricting stops (16,12g) can be overcome so as to enable the positioning device (18) to be pulled out of the second base-tube end (10b) together with the guides (14) after releasing the first component-group unit (18a) from the support (20).
2. Column unit according to Claim 1, characterised in that the pullout-restricting stops (16,12g) are arranged in a manner such that they define an axially outmost limit position of guides (14), in which position the second component-group unit (18b), when it is situated in the outermost position with respect to the second base-tube end (10b), is supported in an optimum manner on base tube (10).
3. Column unit according to Claim 1 or 2, characterised in that the pullout-restricting action of pullout-restricting stops (16,12g) can be cancelled by the application of a predetermined minimum pullout force to the guides (14).
4. Column unit according to Claim 3, characterised in that the pullout-restricting stops (16, 12g) comprise a pullout-restricting stop (12g) on the base-tube side and a pullout-restricting stop (16) on the guides side, wherein the pullout-restricting stop (16) on the guides side is formed by a pullout-restricting ring (16) mounted on an end region (14b) of guides (14) which lies within the base tube (10), said pullout-restricting ring (16) being capable of being stripped off the guides (14) by co-operation with the pullout-restricting stop (12g) on the base-tube side, when a predetermined minimum pullout-force, or a greater pullout force, are applied to the guides (14).
5. Column unit according to Claim 4, characterised in that the pullout-restricting ring (16) is elastically expandable and is accommodated in an annular trough (14b) on an outer peripheral surface (14f) of the guides (14).
6. Column unit according to one of Claims 4 and 5, characterised in that the pullout-restricting stop on the base-tube side is formed by the end (12g), directed towards the first base-tube end (10a), of a centering tube (12) that is inserted in an axially immovable manner into the second base-tube end (10b).
7. Column unit according to Claim 1 or 2, characterised in that the pullout-restricting stops (116, 110f) are basically non-releasable by the mere application of an axial pullout-force on the guides (114) but can be rendered inoperative by at least one release step different from the application of a pullout force.
8. Column unit according to Claim 7, characterised in that the pullout-restricting stops (116, 110f) comprise a slot (110e) in the base tube (110), said slot extending in a substantially axial direction, and a slot-engagement member (116) which engages into the slot (110e) and is connected with the guides (114) for common axial movement, which slot-engagement member co-operates with a slot end (110f) to restrict the outward movement of the guides (114) and can be disengaged from the slot (110e).
9. Column unit according to Claim 8, characterised in that the slot-engagement member is releasable from the guides.
10. Column unit according to Claim 8, characterised in that the slot-engagement member (116) is elastically displaceable with respect to the guides (114), upon leaving the slot (110e).
11. Column unit according to Claim 7, characterised in that the guides (214) can be rotated with respect to the base tube (210) and the pullout-restricting stops (216, 212g) are releasable, or capable of being placed in a release-ready position, by rotating the guides (214) in a specific angular position range (212m) relative to the base tube (210).
12. Column unit according to Claim 11, characterised in that the pullout-restricting stops (216, 212g) comprise an annular stop-edge (212g), mounted within the base tube (210) and directed substantially axially towards the first base-tube end (210a), and a counter-stop (216), mounted on the guides (214) and capable of being adjusted substantially radially inwards from an operating position into a release position, against an elastic restoring force (216a), said counter-stop being brought into a release position by cam means (212n) when the guides (214) are rotated in the direction of the predetermined angular position range (212m).
13. Column unit according to Claim 11, characterised in that the pullout-restricting stops (316, 312g) comprise an annular stop-edge (312g), mounted within the base tube (310) and directed substantially axially towards the first base-tube end (310a), and a counter-stop (316), mounted on the guides (314) adjustable against an elastic force (316a) substantially radially inwards, from an operating position into a release position, said counter-stop reaching the release-ready position when the guides (314) are rotated into the predetermined angular position range (312m), and can be disengaged by cam action (312n, 312o) into its release position, upon subsequent axial pullout motion of the guides (314) from the base tube (310) - optionally only after renewed rotation of the guides (314) with respect to the base tube (310) following a partial pullout motion.
14. Column unit according to Claim 13, characterised in that the stop edge (312g) has a recess (312m), and in that cam means (312n, 312o) is provided adjacent to said recess (312m) on the base tube for co-operation with the counter-stop (316), said cam means causing a transfer of the counter-stop (316) into the release position, after the counter-stop (316) has been introduced into the recess (312m) and after a subsequent relative motion of the guides (314) relative to the base tube (310).
15. Column unit according to Claim 14, characterised in that the cam means (3100) is arranged in a manner such that the counter-stop (316), when it is situated within the recess (312m), is transferable into a release position by axial pullout of the guides (314).
16. Column unit according to Claim 14 or 15, characterised in that the cam means (312n) is arranged in a manner such that the counter-stop (316), when it is situated within the recess (312m), is transferable into a release position by rotating the guides (314) with respect to the base tube (310), preferably by means of cams in one direction only.
17. Column unit according to one of Claims 12 - 16, characterised in that the stop-edge (312g) and the cam means (312n, 312o) are formed on a centering tube (312) introduced into the base tube (310) in the region of the second base-tube end (310b).
18. Column unit according to one of Claims 12 - 17, characterised in that the counter-stop (416i) is formed by a section (416i), e.g. an end section, of a wire clip (416b) which is inserted into an annular receiving trough (414m) on an outer peripheral surface (414f) of the guides (414),
    wherein in the region of a notch (414n) of the guides (414), which cuts into the annular receiving trough (414m), said section (416i) is displaceable radially inwards into the release position against elastic force (416c).
19. Column unit according to Claim 18, characterised in that the section (414i) of the wire clip (416b) is fixed to the guides (414) in a non-rotatable manner and can be rotated in the angular range of a recess (412m) of the stop edge (412g) by rotating the guides (414) with respect to the base tube (410), and in that cam means (412n, 412o) are provided on the base tube (410), adjacent to said recess (412m), which cam means, after the section (416i) has been introduced into the recess (412m), transfer the section (416i) into the release position by a subsequent relative motion of the guides (414) with respect to the base tube (410).
20. Column unit according to Claim 19, characterised in that the cam means (412n 412o) are arranged in a manner such that the section (416i) of the wire clip (416b) is transferable into the release position, after introduction into the recess (412m) by rotation of the guides (414) relative to the base tube (410), preferably by means of cams in one direction only.
21. Column unit according to one of Claims 19 and 20, characterised in that the section (416i) of the wire clip (416b), when adjusted in an angular region outside the recess (412m), engages in a hook-like manner into a radial gap (430) between the stop edge (412g) and an inner peripheral surface of the base tube (410).
22. Column unit according to Claim 21, characterised in that the radial gap (430) between a centering tube (412) introduced into the second base-tube end (410b) and an inner peripheral surface of the base tube (410), is formed by spacers (412d).
23. Column unit according to one of Claims 1 to 22, characterised in that the guides (14) can be driven in at least one axial direction of motion by frictional engagement with the second component-group unit (18b).
24. Column unit according to one of Claims 1 to 23, characterised in that the guides (14) can be driven by means of driving stops (26, 14g) in at least one axial direction of motion of the second component-group unit (18b), with clearance for movement.
25. Column unit according to Claim 24, characterised in that the spring-steel claw-ring (26) is attached to an end section (18p) of the second component-group unit (18b), said end section facing the first base-tube end (10a), which claw ring, upon an axially outward movement of the second component-group unit (18b) with respect to the base tube (10), abuts against a drive surface (14g) of the guides (14).
26. Column unit according to Claim 25, characterised in that the drive surface (14g) is formed by a shoulder surface (14g) between a radially internal guide surface (14e) of the guides (14) and a larger-diameter (14i) recess of the guides (14).
27. Column unit, in particular a chair column unit, comprising a base tube (10) with a base-tube axis (AA), a first base-tube end (10a), a second base-tube end (10b), and guides (14) inserted in the base tube (10) in the region of the second base-tube end (10b), further comprising a positioning device (18) with a device axis that substantially coincides with the base-tube axis (AA), with a first component-group unit (18a) and a second component-group unit (18b), wherein these component-group units (18a, 18b) being movable axially to each other and being lockable in a plurality of axial relative positions against each other, wherein, furthermore, the first component-group unit (18a) is supported on a support (20) connected to the base tube (10), in a manner substantially immovable axially with respect to the base tube (10) and, optionally is rotatable with respect said support (20), wherein, furthermore, the second component-group unit (18b) extends beyond the second base-tube end (10b) and is adjustable between an innermost position and an outermost position with respect to the second base-tube end (10b), wherein, furthermore, an outer section (18n) of the second component-group unit (18b), which section extends beyond the second base-tube end (10b) and beyond the guides (14), is designed to connect with a column-mounted object (22), and wherein the second component-group unit (18b) is in axially sliding engagement with the guides (14), characterised by the combination of the following features:

    (a) the guides (14) are guided along the base tube (10) in an axially shiftable manner;

    (b) the guides (14) can be driven on a partial path by the second component-group unit (18b) when it moves outwards between its innermost position and its outermost position;

    (c) a spring-steel claw ring (26) is attached to an end section (18p) of the second component-group unit (18b), which end section faces the first base-tube end (10a), said claw ring abutting against a drive surface (14g) of the guides (14) when the second component-group unit (18b) moves axially outwards with respect to the base tube (10).
28. Column unit, in particular a chair column unit, comprising a base tube (10) with a base-tube axis (AA), a first base-tube end (10a), a second base-tube end (10b) and guides (14) inserted into the base tube (10) in the region of the second base-tube end (10b);
    further comprising a positioning device (18) with a device axis which substantially coincides with the base-tube axis (AA), with a first component-group unit (18a) and a second component-group unit (18b),
    wherein these component-group units (18a, 18b) being movable axially to each other and being lockable in a plurality of axial relative positions, against each other;
    wherein, furthermore, the first component-group unit (18a) is supported on a support (20) connected to the base tube (10) and, optionally, is rotatable with respect to this support (20),
    wherein, furthermore, the second component-group unit (18b) extends beyond the second base-tube end (10b) and is adjustable between an innermost position and an outermost position with respect to the second base-tube end,
    wherein, furthermore, an outer section (18n) of the second component-group unit (18b), which section extends beyond the second base-tube end and beyond the guides (14), is designed to connect with a column-mounted object (22),
    and wherein the second component-group unit (18b) is in axially sliding engagement with the guides (14),
    characterised by the combination of the following features:

    (a) the guides (a) are guided along the base tube (10) in an axially shiftable manner;

    (b) the guides (14) can be driven over a partial path by the second component-group unit (18b) when it moves outwards between its innermost position and its outermost position;

    (c) the outward movement of the guides (14) with respect to the second base-tube end (10b) is restricted by co-operating pullout-restricting stops (16, 12g) which are mounted on the guides (14) and on the base tube (10);

    (d) the pullout-restricting action of the pullout-restricting stops (16, 12g) can be overcome.

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