EP2873344A1 - Furniture with height adjustable leg - Google Patents

Abstract

The present application relates to a piece of furniture, in particular a table, with at least one length-adjustable leg (15, 15.1, 15.2). The length-adjustable leg (15, 15.1, 15.2) comprises a first telescopic element (2, 2.1, 2.2), which is designed as a hollow body, as well as within the first telescopic element (2, 2.1, 2.2) along a first axis (A) linearly displaceable stored second telescopic element (3, 3.1, 3.2). A locking device (16) arranged on the second telescopic element (3, 3.1, 3.2) has at least one first pin (17) which, via an actuating device (28), moves from a first position in which the at least one first pin (17) controls the movement the first telescopic element (2, 2.1, 2.2) relative to the second telescopic element (3, 3.1, 3.2) prevented by adhesion or positive locking, in a second position in which the displacement is not prevented, is movable. The locking device (16) further has at least one second pin (30), which of the actuating device (28) from a first state in which the at least one second pin (30) against an inner side of a wall of the first telescopic element (2, 2.1 , 2.2) is pressed to clamp the second telescopic element (3, 3.1, 3.2) relative to the first telescopic element (2, 2.1, 2.2), and a second state in which the at least one second pin (30) from the wall of the first telescopic element (2, 2.1, 2.2) is spaced apart, is movable.

Description

Technical area

The invention relates to furniture, especially tables, with at least one height-adjustable leg.

State of the art

Height-adjustable furniture, in particular height-adjustable worktables, are known in the art.

For example, in US 5,706,739 (Ergotech Inc.) describes a height-adjustable workbench in which a work surface is supported on two rectangular telescopic legs. The telescopic legs each have two telescopic elements, which can be moved against each other. About a crank, a shaft is driven, which has in each case a gear in the region of the two telescopic legs. The gears engage in a rack, which is arranged in the two upper telescopic elements. The telescopic elements are mounted on an arrangement of four rollers together. About a locking device in which a slider blocks the rotation of one of the gears, the telescopic elements can be fixed relative to each other.

WO 2006/066116 (Steelcase Development Corp.) discloses mechanically height-adjustable tables, especially with only one foot, wherein a safety lock and preferably an adjustable counterweight are present. The tables comprise a two-part telescopic leg with a force compensation mechanism arranged therein, which comprises inter alia a wire whose ends are fastened to the first and second telescopic part and a force generator whose pretension can be adjusted. The telescopic parts are mounted on rollers with each other, whereby the friction is reduced. Further, a lock is provided which comprises a threaded rod and a cooperating sleeve. By means of a corresponding mechanism actuated by a lever via an actuating cable, the sleeve can be fixed relative to the threaded rod with respect to its rotation. By means of two compression springs also a safety device is provided, which completely prevents a height adjustment at too high forces acting on the table top.

LU 90876 (Deceuninck NV) relates to a height-adjustable support column for supporting a tabletop, which is designed as a two-part telescope. With the upper telescopic part is a mounting plate extending within the column connected to the at least one spring-loaded locking plate is pivotally coupled, so that a lip thereof can engage in one of a plurality of superimposed recesses in the lower telescopic part. Further, means for pivoting the locking plate are present to allow a displacement of the two telescopic parts to each other. The latter means comprise, in particular, a cable connected to the securing plate, which extends in the column up to its upper end and then further outwards and is provided at its corresponding end with an actuating member.

DE 197 49 494 (R. Schmidt ) relates to a height-adjustable work table with at least three spaced apart, variable length over a common drive support legs for receiving a countertop, each support leg consists of an outer tube and at least one inner tube displaceable relative thereto. The inner tube is guided via guide rings axially displaceable in the outer tube. The support legs are each about a tension member in their length vergrösserbar. The end of a tension member is attached to a cap of the inner tube. The tension members of all support legs are guided to a tractor unit and run there over pulleys to a rotatably mounted drum with helical grooves for receiving the tension members. The drum can be arranged with a vertical axis below the worktop. It is powered by hand or motor to adjust the height of the table. About a self-locking of the drive, the support legs can be locked in a specific height.

DE 198 56 864 discloses a table frame with an upper frame, which is mounted on at least two telescopic guides with respect to a pedestal and adjustable in height and locked, the adjustment is done by manually operable and synchronized threaded spindles. On the threaded spindles gears are arranged, which are connected via a chain or a toothed belt with a drive gear. To the drive gear, an actuating mechanism is coupled with locking device. Preferably, a drive drum is connected to the drive gear, on whose circumference a drive jaw engages, which is actuated via a cable against the force of a spring in the circumferential direction of a pull rod. On the circumference of the drive drum, a brake shoe for releasably engages to lock. Further, for weight relief of the upper frame advantageously a coil spring coupled to the drive gear or the drive drum, wherein the attachment point of the coil spring and thus the bias of which is adjustable by an adjustable fastener.

The height-adjustable tables known in the prior art have the disadvantage that due to the roller guides the telescopic legs must be dimensioned relatively large and that the known locking devices which fix the telescopic legs in a certain length, a tabletop can only be limited movement stable lock.

Presentation of the invention

The object of the invention is to provide a the technical field mentioned above belonging furniture with höhenverstellbarem leg, which has a slim as possible embodiment of the leg and a smooth height adjustment, the furniture can be locked motion stable at a certain height.

The solution of the problem is defined by the features of claim 1. According to the invention, a piece of furniture has at least one length-adjustable leg which comprises a first telescopic element, which is designed as a hollow body, and a second telescopic element, which is mounted linearly displaceably along a first axis within the first telescopic element. A locking device is arranged on the second telescopic element. The locking device has at least one first pin, which prevents the movement of the first telescopic element relative to the second telescopic element by frictional connection or positive locking via an actuating device from a first position in which the at least one first pin, in a second position in which the displacement is not is prevented, is movable. Furthermore, the locking device has at least one second pin, which is pressed by the actuating device from a first state in which the at least one second pin is pressed against an inner side of a wall of the first telescopic element to the second telescopic element relative to the first To clamp Telskopelement, and a second state in which the at least one second pin is spaced from the wall of the first telescopic element, is movable.

The furniture is preferably a table, in particular a work table, with a substantially flat work surface. Alternatively, the furniture may be a chair, sideboard, shelf, carcass or the like. In principle, all types of furniture which are designed adjustable in height, can be configured according to the present invention.

The at least one length-adjustable leg preferably has a round cross-section. Alternatively, however, the at least one length-adjustable leg can also have a square, rectangular or any polygonal cross-section.

The furniture preferably has two length-adjustable legs. Depending on the size or design of the furniture this may also have more than two adjustable legs, in particular four or more adjustable legs. Alternatively, however, a piece of furniture may also have only a single length-adjustable leg, for. B. if the furniture is a stool, bistro table or similar. The at least one height-adjustable leg further preferably has a boom or a base plate to the height-adjustable leg motion safe on a surface, such. B. the floor of a room to ask.

The second telescopic element is arranged in the first telescopic element and movable relative thereto along a first axis. Accordingly, the first telescopic element and the second telescopic element overlap in the region in which the second telescopic element is received within the first telescopic element.

Preferably, the first axis is arranged so that it is substantially normal to the surface of the ground on which the furniture stands. The relative movement of the two telescopic elements of the at least one height-adjustable leg is preferably driven by a corresponding mechanism. For this purpose, the furniture preferably has, for example, a hand crank with the aid of which a user can move the two telescopic elements of the at least one length-adjustable leg relative to one another in both directions along the first axis. The transmission of the movement of the crank on at least one of the telescopic elements is preferably carried out via a cable. Particularly preferably, the mechanism additionally has a device with which the weight of the furniture is compensated, such as a counter to the direction of the self-weight force acting spring force to allow the smoothest possible length adjustment of the at least one adjustable leg. Preferably, this spring force can be varied over a change in length of a spring, for example, via a crank in order to allow an individual adjustment of the compensation of the dead weight force. Alternatively, however, an electric motor may be provided which allows a particularly simple length adjustment of at least one leg adjustable in length. Next alternatively, no mechanism can be provided and the length adjustment purely by lifting the furniture done by a user.

The at least one first pin engages preferably in the sense of a positive connection in a structure of the first telescopic element. For example, the at least one first pin has a surface with teeth, which engages in a corresponding surface within the first telescopic element with complementary teeth. Alternatively, the at least one first pin can also prevent a relative displacement of the telescopic elements against one another via a pure frictional connection. In particular, in the case of a purely force-locking embodiment, a surface of the at least one first pin and a surface of the first telescopic element, which is engaged by the at least one first pin, are provided with surfaces which have a high static friction relative to each other.

Due to the positive or non-positive locking of the second telescopic element relative to the first telescopic element, a reliable fixation of the at least one length-adjustable leg is made possible in a certain length adjustment.

Particularly preferably, the locking device has more than one first pin, in particular two first pins, which can enter into a force or positive engagement with the first telescopic element, for example, on two opposite sides of the second telescopic element.

In the second position, the at least one first pin is preferably from the first telescopic element or a surface within the first telescopic element spaced, whereby no force or positive connection with the first telescopic element. As a result, the second telescopic element can be moved freely along the first axis in both directions relative to the first telescopic element.

In order to prevent unintentional sliding apart of the two telescopic elements, a stop is preferably provided which limits the movement of the second telescopic element relative to the first telescopic element. Accordingly, this limitation defines the maximum length of the at least one length-adjustable leg. Similarly, a further stop can be provided to define a maximum overlap of the second telescopic element with the first telescopic element. This second stop thus defines the shortest length of the adjustable leg.

If the furniture has more than just one leg that can be adjusted in length, the actuating device is preferably designed such that the at least one first pin and the at least one second pin of all length-adjustable legs can be actuated at the same time. This simplifies the handling of the height adjustment of a piece of furniture according to the invention.

The at least one second pin presses in the first state against an inner side of the wall of the first telescopic element. Due to the force with which the at least one second pin presses on the first telescopic element, the second telescopic element braces relative to the first telescopic element. This means that a possible clearance between the first and the second telescopic element is prevented by the tension of the two telescopic elements against each other. As a result, the second telescopic element is fixed against movement with respect to the first telescopic element. Any lateral movements of the furniture caused by a play between the two telescopic elements can thus be reliably prevented.

Compared with length-adjustable legs, in which a telescopic element are completely guided by rollers within another telescopic element, the solution according to the invention also provides a secure movement fixation, but at a much smaller footprint, since the roles are replaced by space-saving bearings can. This allows the creation of furniture with slim, yet motion-safe, adjustable legs.

The at least one first pin is preferably mounted in the locking device such that it is movable along a second axis, which is essentially at right angles to the first axis. In this case, a movement of the actuating device against a first restoring force in a first direction along the first axis is converted from a locked position to an unlocked position via a first slotted guide in a movement of the at least one first pin along the second axis from the first position to the second position ,

By using a slotted guide, a movement of the actuating device along the first axis, ie along the axis in which the relative movement of the two telescopic elements to each other, can be particularly simple and reliable in a movement along a second axis, which is substantially at right angles to the second axis, implement.

Due to the arrangement of the second axis substantially at right angles to the first axis, a reliable form or adhesion of the at least one first pin to the first telescopic element can be generated.

"Substantially at right angles" in this application means an included angle of 90 ° plus / minus a maximum deviation of 5 °.

The storage of the at least one first pin in the locking device is preferably carried out by arranging the at least one first pin in a linear guide, in particular in a groove or recess of the locking device.

By providing the first restoring force, which is generated for example by a helical spring, the at least one first pin is automatically pushed into the first position. Thereby, the actuating device can be designed such that it exerts a tensile force only in the first direction, since the movement of the actuating device in the second direction and thus the movement of the at least one first pin from the second position to the first position by the restoring force he follows. In addition, can be acted upon by the restoring force of at least one first pin with a sufficiently high force to ensure a reliable positive or non-positive connection with the first telescopic element.

The actuator has a locked and unlocked position, wherein in the unlocked position the at least one first pin is in the second position and the at least one second pin is in the second state while the pins are in the locked position in the first position in the first state. Thus, when the actuator is in the unlocked position, the length of the at least one adjustable leg can be changed, i. H. move the two telescopic elements relative to each other. However, the actuator is in the locked state, the two telescopic elements are locked together and the length of the adjustable leg can not be changed.

The actuator is preferably operated by a lever so that it can be brought from the locked position to the unlocked position. The actuating device preferably has a transmission element, such as a wire, a chain or the like, with which a force can be transmitted at least to the first link guide.

Preferably, the at least one second pin is mounted in the locking device such that it is movable along a third axis, which is substantially at right angles to the first axis and preferably at right angles to the second axis. Movement of the actuator against a second return force acting on the second pin from the locked position to the unlocked position via a second slotted guide is translated into movement of the at least one second pin along the third axis from the first state to the second state.

By the movement of the at least one third pin along a third axis, which is substantially at a right angle to the first axis, a maximum possible tension of the two telescopic elements to each other can be achieved. Due to the preferred arrangement of the third axis essentially in a right Angle to the second axis, along which moves the at least one second pin, improved movement safety can be achieved, as if the at least one second pin move along the same second axis as the at least one first pin, would. Since the positive or positive connection of the at least one first pin already ensures a certain degree of movement safety along the second axis, a movement-secure locking of the second telescopic element to the first telescopic element can additionally be achieved along the third axis by the clamping. Overall, it is thus possible to realize a locking of the two telescopic elements which is secure against movement in all directions relative to one another.

The storage of the at least one second pin in the locking device is preferably carried out by arranging the at least one second pin in a linear guide, in particular in a groove or recess of the locking device.

The at least one second pin is preferably moved via the same actuating device as the at least one first pin. This allows the simplest possible locking and clamping of the two telescopic elements to each other.

The second restoring force can act directly on the at least one second pin, but preferably acts via the second linearly displaceable plate indirectly via the second slotted guide on the at least one second pin. The second restoring force is preferably designed as a spring, in particular as a spiral spring. Alternatively, the second restoring force may also be formed as a spiral spring or as an elastic element.

Via the second slotted guide, a particularly simple implementation of the movement of the actuating device along the first axis into a movement of the at least one second pin along the third axis is made possible.

Vorzugsseise the furniture has a single second pin. In particular, in furniture with adjustable legs with a round cross-section of a particularly motion-secure clamping of the telescopic elements is made possible. Alternatively, however, several second pins can be used for clamping. Particularly preferably, the first slotted guide is formed as a linearly movable along the first axis first plate on which a first groove is formed. In this first groove a arranged on the first pin first pin is guided.

The second slotted guide is preferably designed as a second groove introduced in a second plate which is linearly movable along the first axis. In this second groove arranged on the at least one second pin second pin is guided.

The combination of groove and pin allows a particularly simple design of the slide guide (s).

Preferably, the second slotted guide is formed as a curve, wherein this curve is configured such that upon movement of the at least one second pin from the second state to the first state, the curve first has a first region with a greater slope than in a second, subsequent region ,

As a result of this embodiment, the at least one second pin can initially be moved relatively quickly along the third axis over the greater pitch until it comes into contact with the inside of the wall of the first telescopic element. By the subsequent, smaller slope of the curve of the at least one second pin is then pressed with a smaller movement speed, but with a greater force against the inside of the wall to allow the tension of the two telescopic elements. At the same time can be achieved in the second groove by the design of the curve with the two areas of different pitch self-locking of the second pin.

As "slope" in the sense of the present application, the angle is understood, which takes the curve of the second link guide relative to the first axis. The larger this angle, the greater the slope of the curve.

Preferably, the actuating device has a driver, which abuts a stop surface of the second plate upon movement of the actuating device from the locked position to the unlocked position.

Upon movement of the actuator from the locked to the unlocked state in the first direction along the first axis, the driver strikes the abutment surface of the first plate. As a result, the second slide guide is pulled by the actuating device in the first direction, whereby a movement of the second pin and thus of the at least one second pin from the first state to the second state.

Upon movement of the actuator from the unlocked position to the locked position in a second direction opposite the first direction, the driver may disengage from the stop surface and thus move the actuator further in the second direction than the second plate. This makes it possible to at least partially decouple the movement of the at least one first pin, which is preferably also moved via the same actuating device, from the second to the first position from the movement of the at least one second pin from the second state to the first state.

Since a second restoring force acting on the at least one second pin, this is applied without contact to the driver of the actuator with a sufficiently high force to allow a distortion of the two telescopic elements against each other.

The at least one first pin is preferably also connected via a stop surface with the actuating device.

Preferably, the locking device is arranged within the second telescopic element, wherein in a wall of the second telescopic element at least one opening is provided, through which the at least one second pin is movable therethrough.

Due to the arrangement of the locking device within the second telescopic element, a particularly compact design of the at least one length-adjustable leg can be achieved. In addition, a particularly good clamping of the two telescopic elements to each other is possible.

Preferably, an opening in the wall can also be provided for the at least one first pin, so that this at least one first pin can enter through the wall of the second telescopic element through the first telescopic element a non-positive or positive connection.

Preferably, the actuator is designed as a Bowden cable. This allows the actuator to be designed as simple as possible. In particular, a Bowden cable can also be deflected by means of rollers or the like, for example in order to be able to arrange a lever designed for actuating the Bowden cable outside the at least one leg, in particular below a table top.

Preferably, in a region of a first end of the first telescopic element on the inside of the wall at least one sliding bearing is arranged, which cooperates with a wall on an outer side of the second telescopic element.

The arrangement of a sliding bearing, the at least one adjustable leg can be made very slim, which gives the furniture overall an appealing aesthetic effect.

Particularly preferably, the first end of the first telescopic element is the upper end thereof. In this case, the first telescopic element represents the lower part and the second telescopic element represents the upper part of the at least one length-adjustable leg.

Preferably, the second telescopic element has at least one roller bearing at a second end, which interacts with the inside of the wall of the first telescopic element.

At least two rollers, which are located on opposite sides of the second telescopic element, are particularly preferably used as roller bearings. These rollers are arranged such that their lateral surfaces touch the inner wall of the first telescopic element at least one point. The at least two rollers thus roll on the inside of the wall.

More preferably, the rolling bearing is arranged on the locking device.

The second telescopic element is preferably arranged in the first telescopic element such that the second end of the second telescopic element lies in the first direction along the first axis below the first end of the first telescopic element. As a result, the second telescopic element is mounted at its second end via a roller bearing and in a region which lies in the first direction above the roller bearing, via a sliding bearing linearly displaceable within the first telescopic element.

Preferably, within the first telescopic element at least one arm is arranged, which extends from a second end to the first end of the first telescopic element, wherein the at least one first pin in the first position with the cantilever force or positively cooperates.

By arranging a cantilever within the first telescopic element, the surface with which the at least one first pin co-operates in a force-locking or positive-locking manner can be separated from the inside of the wall of the first telescopic element. As a result, obstruction of the linear displacement movement of the second telescopic element within the first telescopic element is prevented by this surface.

Particularly preferably, the arm extends at least partially into an interior of the second telescopic element. As a result, a guide can be arranged within the second telescopic element, which guide cooperates with the arm, in order to allow a particularly good linear guidance of the second telescopic element within the first telescopic element. The guide is formed in particular in the form of at least one guide groove or at least one half-ring, which (r) is slidably mounted along the cantilever.

From the following detailed description and the totality of the claims, further advantageous embodiments and feature combinations of the invention result.

Brief description of the drawings

Fig. 1

Ein erfindungsgemässer Tisch mit zwei längenverstellbaren Beinen;

Fig. 2

eine dreidimensionale Ansicht einer Ausführungsform einer Arretiervorrichtung;

Fig. 3

die Ausführungsform der Arreteiervorrichtung der Fig. 2 um 90° gedreht;

Fig. 4

eine Schnittzeichnung einer Ausführungsform einer Arretiervorrichtung;

Fig. 5

eine Schnittzeichnung der Ausführungsform der Arretiervorrichtung der Fig. 4 um 90° gedreht.

The drawings used to explain the embodiment show:

Fig. 1

A table according to the invention with two length-adjustable legs;

Fig. 2

a three-dimensional view of an embodiment of a locking device;

Fig. 3

the embodiment of the Arreteiervorrichtung the Fig. 2 turned by 90 degrees;

Fig. 4

a sectional view of an embodiment of a locking device;

Fig. 5

a sectional view of the embodiment of the locking device of Fig. 4 turned by 90 degrees.

Basically, the same parts are provided with the same reference numerals in the figures.

Ways to carry out the invention

The FIG. 1 shows an inventive furniture in one embodiment as a table 1 with two length-adjustable legs 15.1, 15.2. The adjustable-length legs 15.1, 15.2 each comprise a first telescopic element 2: 1, 2.2 and a second telescopic element 3.2, 3.2 received within the first telescopic element 2.1, 2.2 and mounted linearly displaceably. At a lower end of the first telescopic elements 2.1, 2.2 are 4.1, 4.2 arranged. The boom 4.1, 4.2 increase the stability of the tilting table 1 against the ground on which the table 1 stands. The two length-adjustable legs 15.1, 15.2 are connected to one another via a cross member 5 in an upper region of the first telescopic element 2.1, 2.2.

In the region of an upper end of the second telescopic elements 3.1, 3.2 two carriers 6.1, 6.2 are arranged, on which a table top (not shown) can be mounted. Between these carriers 6.1, 6.2 and below the table top, an adjusting mechanism is arranged, with which the second telescopic elements 3.1, 3.2 can be moved linearly relative to the first telescopic elements 2.1, 2.2. This adjustment mechanism has a drive pulley 8, around the circumference of which two wires 7.1, 7.2 can be rolled up. The wires 7.1, 7.2 are deflected via corresponding rollers and guided in the length-adjustable legs 15.1, 15.2. By rolling up the wires 7.1, 7.2 to the drive pulley 8, the table top can be made higher with the adjusting mechanism shown. Accordingly, unwinding of the wires 7.1, 7.2 causes a lowering of the table top.

About a counterweight spring 9 is a compensation of the dead weight of the table top. This allows a relatively smooth height adjustment of the table. The counterweight spring preferably has an adjusting arrangement with which the force exerted by the counterweight spring 9 can be changed by an extension or shortening of the counterweight spring 9. This adjustment arrangement has a hand crank 11, with which the length of the counterweight spring 9 can be adjusted via a spindle 10 in order to allow different preloads of the counterweight spring 9 to compensate for the dead weight. The drive pulley 8 with the wires 7.1, 7.2 is attached to the counterweight spring 9.

The FIG. 2 shows a three-dimensional view of a locking device 16 which cooperates with two cantilever pins 23.1, 23.2 of a cantilever of the first telescopic element 2. The two cantilever pins 23.1, 23.2 are connected to each other via a connecting element 24 at its upper end. A wire 7 of an adjusting mechanism is connected to the connecting element 24. The wire 7 is first guided parallel to the delivery pins 23.1, 23.2 to a deflection roller 27. About this guide roller 27 of the wire 7 is deflected by 180 ° and then guided parallel to a wall of the second telescopic element (not shown) through this to the adjusting mechanism.

For illustrative reasons, the first telescopic element 2 and the second telescopic element 3 are not shown in this figure. The locking device 16 is arranged at the second, lower end of the second telescopic element 3. About two guide brackets 25.1, 25.2, the locking device 16 along the two boom pins 23.1, 23.2 out. Furthermore, four rollers, of which only two rollers 26.1, 26.2 can be seen in the figure, are arranged at the lower end of the locking device 16. By means of the rollers 26.1, 26.2, the locking device 16 is guided linearly displaceable within the second telescopic element 3.

A first pin 17 is arranged linearly displaceable between a first and a second position in the locking device 16. A movement of the first pin 17 from the first to the second position shown is made possible by movement of an actuating device 28, which is formed in the embodiment shown as a Bowden cable, in a first direction 33 along a first axis A. The actuator 28 is connected to a first in the direction A linearly displaceably mounted first plate 18. The first plate 18 has a first slide guide 19, which is formed as a groove. In the slotted guide 19, a first pin 20 is guided, which is connected to the first pin 17. Via this first slide guide 19, a movement of the first plate 18, which is triggered by the actuator 28, in a linear movement of the first pin 17 along a second axis B, which is at a right angle to the first axis A, implemented. The first slide guide 19 is formed in the embodiment shown as a curve.

On the first plate 18 engages a first coil spring 21, which opposite to the first direction 33, a restoring force in a second direction 34, which is opposite to the first direction 33, on the first plate 18 exerts. By this restoring force of the first pin 17 - if no force is exerted in the first direction 33 on the first plate 18 by the actuator 28 - acted on the first link guide 19 with a force which presses this in the first position. In this first position, the first pin engages with a surface 22 with form-locking elements on the first boom pin 23.1. The first cantilever pin 23.1 has complementary form-fitting elements (not shown), so that a positive connection of the first pin 17 with the first cantilever pin 23.1 results. As a result of this positive fitment, movement of the first pin 17 and thus of the entire locking device 16 along the first axis A is prevented.

A second pin 30 is mounted linearly displaceable in the locking device 16 along a third axis C. A linear movement of a second plate 31 along the The first axis A is converted via a second link guide 32, in which a second pin 33 which is connected to the second pin 30, in the linear movement of the second pin 30 along the third axis C. In the figure, the second pin 30 is in a second state in which the second pin 30 is spaced from an inner wall of the first telescopic member 2 (not shown). By moving along the third axis C, the second pin 30 can be brought into a second state in which the second pin 30 presses against the inner wall of the first telescopic element 2. As a result, a tension between the two telescopic elements 2, 3 is achieved.

Via a second coil spring 34, which acts on the second plate 31, a second restoring force is exerted on the second plate 31. By this second restoring force of the second pin 30 is - unless no force in the first direction 33 is exerted by the actuator 28 - pressed into the second position. In addition, this second restoring force enhances the tension of the two telescopic elements 2, 3, since the pressure force of the second pin 30 is reinforced on the inner wall of the first telescopic element via the second spiral spring 34.

The second slotted guide 32 is formed as a groove. The groove is designed as a curve which has a greater slope in a first region 35 than in a second region 36. The pitch is to be understood in each case as the angle which is enclosed between a side edge of the groove and the first axis A. The curve is designed such that the transition between the first region 35 and the second region 36 is located at the point where the second pin 33 is located at the moment at which the second pin 30 with the inner wall of the first telescopic element 2 in Touch comes. The subsequent smaller pitch in the second region 36, the movement of the second pin 30 at a lower speed, but with more force, whereby a particularly efficient clamping of the two telescopic elements 2, 3 is made possible by the second pin 30. Furthermore, such a configuration of the second slide guide 32 also has a self-locking of the pin 33 as soon as the two telescopic elements 2, 3 are braced against each other by the second pin 30.

The FIG. 3 shows the in the FIG. 2 illustrated embodiment of the locking device 16 is rotated by 90 ° about the axis A. In addition, corresponding covers of the locking device 16 are shown in this figure.

The figure shows the attachment of the actuator 28 with the linearly movable second plate 31. The second plate 31 has an angled at 90 ° relative to the rest of the second plate 31 area with an opening 39 through which the actuator formed as a Bowden cable 28th is performed. The lower side of the angled region forms a second abutment surface 38, on which a second driver 37 arranged on the actuating device strikes in the first direction 33 during a movement of the actuating device 28. Characterized in that the second driver 37 is not fixedly connected to the angled portion of the second plate 31, the actuator 28 is free to move in the second direction 34. As a result, the first plate 18 can be moved further in the second direction than the second plate 31. The first plate 18 is also in the same way via a first driver 41 which abuts against a first abutment surface 42 of the first plate 18 when the Actuator 28 is moved in the first direction 33, connected to the actuator 28. As a result, both plates 18, 31 can be moved freely with the actuating device 28 released by the first coil spring 21 and by the second coil spring 34 in the first position and in the first state.

FIG. 4 shows a section through a length-adjustable leg 15 according to the present invention along the first axis A. The sectional plane is in the direction of the second axis B. In contrast to the Figures 2 and 3 is the first pin 17 in the first position, ie it engages positively on a surface of the first boom pin 23.1 a. At the top of the first pin 17 is a correspondingly configured surface 22 with positive locking elements. As can be seen in this figure, this surface 22 is formed in the embodiment shown on a plug inserted into the first pin 17.

In this figure, the overlap of the second telescopic element 3 with the first telescopic element 2, which by the recording of the second Telescopic element 3 is formed in the first telescopic element 3. In the embodiment shown, a state is shown with a minimum overlap of the two telescopic elements 2, 3, that is to say the state in which the length-adjustable leg 15 has the greatest length. At the lower, second end of the second telescopic element, in turn, three of the four rollers 26.1, 26.2, 26.3 are visible, with which the second telescopic element 3 is mounted linearly displaceable in the first telescopic element 2.

On the FIG. 5 is another sectional drawing of the adjustable leg 15 after FIG. 4 shown, but rotated by 90 ° about the first axis A. In contrast to FIG. 4 In this illustration, the arrangement of the second pin 30 is clearly visible. The second pin 30 is disposed within a linear guide 40 which allows the movement of the second pin 30 along the third axis C. The second plate 31 consists of three elements, of which two elements 31.1, 31.2 can be seen in the figure. The upper element 31.2 is inserted into a holder which is composed of two lower elements 31.1. In the lower elements 31.1 and the second linear guide 32 is introduced, in which the second pin 32 is guided.

In addition to the rollers, of which only two rollers 26.2, 26.4 are visible in the figure, the plain bearing 39 mounted on the inner wall of the first telescopic element 2 can also be seen on this figure. About the rollers 26.2, 26.4 and the sliding bearing 39, the second telescopic element 3 is mounted linearly displaceable within the first telescopic element 2.

Claims (11)

Furniture, in particular a table, having at least one length-adjustable leg (15, 15.1, 15.2), wherein the adjustable-length leg (15, 15.1, 15.2) comprises: a) a first telescopic element (2, 2.1, 2.2), which is designed as a hollow body, b) a second telescopic element (3, 3.1, 3.2) mounted linearly displaceably within a first telescopic element (2, 2.1, 2.2) along a first axis (A), c) a locking device (16) arranged on the second telescopic element (3, 3.1, 3.2), which has at least one first pin (17), which via an actuating device (28) from a first position, in which the at least one first pin (17 ) the movement of the first telescopic element (2, 2.1, 2.2) relative to the second telescopic element (3, 3.1, 3.2) prevented by adhesion or positive locking, in a second position in which the displacement is not prevented, is movable,
characterized in that
the locking device (16) has at least one second pin (30) which is displaceable by the actuating device (28) from a first state in which the at least one second pin (30) against an inner side of a wall of the first telescopic element (2, 2.1, 2.2) is pressed to the second telescopic element (3, 3.1, 3.2) relative to the first telescopic element (2, 2.1, 2.2) to brace, and a second state, in which the at least one second pin (30) from the wall of the first Telescopic element (2, 2.1, 2.2) is spaced apart, is movable. Furniture according to claim 1, characterized in that the at least one first pin (17) is mounted in the locking device (16) such that it along a second axis (B) which is substantially at right angles to the first axis (A) , is movable, wherein a movement of the actuating device (28) opposite a first restoring force in a first direction (41) along the first axis from a locked position to an unlocked position via a first slotted guide (19) into movement of the at least one first pin (17) along the second axis (B) from the first Position is converted to the second position. Furniture according to one of claims 1 or 2, characterized in that the at least one second pin (17) in the locking device (16) is mounted such that this along a third axis (C) which is substantially at right angles to the first axis (A) and preferably at right angles to the second axis (B) is movable, wherein a movement of the actuating device (28) against a second restoring force which acts on the at least one second pin (30), from the locked position in the unlocked position via a second link guide (32) is converted into a movement of the at least one second pin (30) along the third axis (C) from the first state to the second state. Furniture according to claim 3, characterized in that the second slide guide (32) as a in a along the first axis (A) linearly movable second plate (31; 31.1, 31.2) introduced second groove is formed, in which a on the at least one second pin (30) arranged second pin (33) is guided. Furniture according to claim 4, characterized in that the second slotted guide (32) is present as a curve, wherein the curve is configured such that upon movement of the at least one second pin (30) from the second state to the first state, the curve first in a first region (35) has a greater slope than in a subsequent second region (36). Furniture according to one of claims 3 to 5, characterized in that the actuating device (28) has a second driver (37), which upon movement of the actuating device (28) from the locked position to the unlocked position to a second stop surface (38 ) of the second plate (31, 31.1, 31.2) abuts. Furniture according to one of claims 1 to 6, characterized in that the locking device (16) within the second telescopic element (3, 3.1, 3.2) is arranged, wherein in a wall of the second telescopic element (3, 3.1, 3.2) provided at least one opening is, through which the at least one second pin (30) is movable therethrough. Furniture according to one of claims 1 to 7, characterized in that the actuating device (28) is designed as a Bowden cable. Furniture according to one of claims 1 to 8, characterized in that in a region of a first end of the at least one first telescopic element (2, 2.1, 2.2) on the inside of the wall at least one sliding bearing (39) is arranged, which with a wall an outer side of the second telescopic element (3, 3.1, 3.2) cooperates. Furniture according to one of claims 1 to 9, characterized in that the second telescopic element (3, 3.1, 3.2) at a second end at least one roller bearing (26.1, 26.2, 26.3, 26.4), which with the inside of the wall of the first telescopic element (2, 2.1, 2.2). Furniture according to one of claims 1 to 10, characterized in that within the first telescopic element (2, 2.1, 2.2) at least one arm (23.1, 23.2) is arranged, which extends from a second end to the first end of the first telescopic element (2, 2.1, 2.2), wherein the at least one second pin (30) in the first state with the cantilever (23.1, 23.2) non-positively or positively cooperates.

Images