DE8800524U1 - Height adjustment device for furniture, especially for height-adjustable tables - Google Patents

Description

Height adjustment device for furniture, especially for height-adjustable tables

The invention relates to a height adjustment device for furniture according to the preamble of claim 1, which is particularly intended for height-adjustable tables.

In such a known height adjustment device for height-adjustable tables (DE-OS 31 14 366), the telescopic column consists of a square outer tube and a square inner tube that can be adjusted vertically within it, which are arranged at a mutual distance from one another, with rolling bearing baskets being arranged in the space between the two tubes, which have rolling or roller bodies on at least two opposite sides of the two interlocking tubes. In addition, there is an adjusting plate on at least one side of the rolling bearing baskets, which can be adjusted from the outside of the square outer tube transversely to the longitudinal axis of the telescopic column and on which the roller bodies roll. Such adjusting plates can easily compensate for any tolerances between the telescopic tubes without complex surface treatment.

35 will be.

.„position of the table is provided by a handwheel with a pinion, which is mounted on the axis of the handwheel in the k Inside the two telescopic tubes and with

i§ an internal rack on the inside of the

Square inner tube of the telescopic tube arrangement. A screw is used to balance the weight of the table top . ■ Compression spring arranged between the two telescopic tubes.,

which support the weight of the table top.

10

In this known height adjustment device, the extendable square inner tube must be slotted at the point where the handwheel with the pinion is rotatably mounted on the square outer tube over a length that corresponds to the lifting height of the height adjustment device. This requires a corresponding technical effort. In addition, the height adjustment device can be operated via the The handwheel located on the table column is comparatively cumbersome.

$ To lock the height adjustment, outside the

20 outer telescopic tube a brake drum is arranged, which is very hindering for the design of the MÖLfels.

f The invention is based on the object of nine height

Adjusting device according to the preamble of claim 1 with

25 simple means to make construction easier and

to make it more user-friendly.

This object is achieved according to the invention by the characterizing part of claim 1, while particularly advantageous further developments of the invention are characterized in claims 2 to 12.

The invention separates the lifting device from the device in terms of function, whereby the locking device can also be operated independently of the lifting device.

7« ■ ·

This makes it possible to operate the locking device independently of the lifting device, and the handle for the locking device can also be positioned, for example, just below the edge of a table equipped with such a height adjustment device. The upper part of the table is arranged so that it is floating relative to the lower part of the table due to the helical compression spring serving as a compensating spring and the separate locking device. The locking device has a type of remote control.

The rack, the pinion and the locking device for the pinion can be arranged particularly advantageously in the space between the two telescopic tubes. The rack is preferably arranged on the outer part and the pinion with the locking device on the inner part of the two telescopic tubes, and in addition the remote control for the locking device can preferably be assigned to the movable part of the telescopic tube arrangement and, depending on the installation position, can be designed either as a hand rocker or, if necessary, as a foot rocker.

Advantageously, a locking slide engaging in the pinion can be provided as a locking device, which can be moved on the telescopic tube or on the square inner tube with the pinion transversely to the axis of rotation of the pinion in the longitudinal direction of the telescopic tube or the square inner tube against the pressure of a spring.

Further particularly advantageous details of the invention are characterized in claims 6 to 12, whereby it should also be pointed out that by separating the locking device from the lifting device according to the invention, the helical compression spring serving as the lifting device is in the

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Square inner tube of the telescopic tube arrangement can extend over its entire length. In the upper part of the square inner tube or possibly also in the lower part of the square outer tube, an adjustment device for the helical compression spring can also be provided in order to easily adapt the force of this spring to the loads caused by different weights of the table tops of such height-adjustable tables.

A preferred embodiment of the invention is shown schematically in the drawing.

Fig. 1 a height adjustment device on a height-adjustable table in side view, 15

Fig. 2 a vertical section through such a Height adjustment device according to cutting line II-II of Fig. 3, where the upper part of Fig. 2 according to section line V-V of Fig. 4

is shown,

Fig. 3 is a horizontal section through such a height adjustment device according to section line III-III of Fig. 1 and
25

Fig. 4 shows a further section through the height adjustment device according to section line IV-IV of Fig. 1.

The height adjustment device 1 consists of a square Inner tube 2 and a square outer tube 3, which is in the deep

foot 4 is firmly anchored. Between the square inner tube 2 and the square outer tube 3 there is a ball cage 5 (Fig.

2 and 3)» whereby the tolerance between the two square tubes 2, 3 and the ball cage 5 is determined by two adjusting plates arranged at an angle in the square outer tube 3.

ten 6, which can be pressed or adjusted as required by the inner wall of the square outer tube 3 against the two adjacent side surfaces of the ball cage 5 using adjusting screws (not shown).

A rack 7 is attached to the inside of the square outer tube 3 in the lower half of the tube, in whose teeth a pinion 8 engages, which is freely rotatably mounted at the lower end of the square inner tube 2 and which runs along without drive in the rack 7 attached to the square outer tube 3 when the telescopic column is adjusted.

Above the pinion 8, a locking slide 10 provided with guide slots 9 is guided on the square inner tube 2 so as to be movable up and down. In the locking position of the pinion Δ, the locking slide 10 engages the pinion 8 with a lower toothing 11 and thus secures it against rotation relative to the vertical rack 7.
20

The vertical locking slide 10 has at its upper end an obliquely arranged elongated hole 12 for the engagement of an actuating pin 13 which is directed from an upper cross slide 14 against the locking slide 10.
25

The upper cross slide 14 is arranged just below the table top 15 against the pressure of a return spring 16 by means of a manual control shell designed as a rocker 17 via a pull rod 18 so that it can be moved transversely relative to the vertical locking slide 10, so that when the manual control shell is operated, i.e. when the manual control shell is raised, the cross slide 14 is moved to the right in Fig. 1 and 2 against the pressure of the return spring 16 and the locking slide 10 is released from

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&Igr; of the teeth of the pinion 8, so that the

•v Lifting device can be set to any desired height in a floating manner against the effect of a helical compression spring 19, which extends through the telescopic tube arrangement practically over its entire length.

The helical compression spring 19 penetrates the telescopic tube arrangement from the bottom of the square outer tube 3 to the

■ upper end of the square inner tube 2, where it rests against an adjusting plate (not shown) which is fixed by means of a \ Adjusting screw for fine tuning of the spring pressure . can be adjusted to intermediate weights of the table tops 15 used. The helical compression spring 19 is

■ guided inside the continuously open square inner tube 2-15 .

As a stop protection against lifting of the square inner

i nenrohr 2, this indicates in a known manner at its

lower end directed to the side, not shown in the drawing

20 shown locking lugs, which in the highest permissible

Position under the ball cage 5.

j To prevent accidental activation of the height adjustment

j adjusting device 1, a locking screw is

; 25 be 20 arranged on the back of the cross slide 14, &iacgr; which against the outer wall of the square inner tube 2 so

can be tightened so that the transverse actuator 14 cannot be operated. This can prevent accidents caused by inadvertent operation of the height adjustment device 1 both before its installation and during transport of height-adjustable tables that are equipped with such a height adjustment device.

35

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As can be seen in detail in Fig. 2 to 4, the cross slide 14 can be moved relative to the square inner tube 2 in elongated hole guides 21 and engages behind the square inner tube 2 with a leg 23 angled to the side transversely to its direction of displacement 22, on which the locking screw 20 is arranged so as to be adjustable in the direction of displacement 22.

The cross slide 14 can also be operated via a pulling element 22, such as a pull rod, a pull band or a pull rope, by means of the hand rocker 17, which is pivotally mounted on a cantilever arm 23 protruding to the side from the square inner tube 2. The cantilever arm 23 has a bendable end section 24, which can be fixed in different height positions in relation to the square inner tube 2 in such a way that the hand rocker 17 can be arranged in the immediate vicinity of the associated table top 15 as required.

The height adjustment device is designed as a self-contained unit for installation in height-adjustable tables or furniture. Instead of a mechanical actuation of the locking device, an electrical, electromagnetic or pressure-dependent actuation of a pawl or the like engaging in the pinion 8 would also be possible.

NEW5/14

Claims (12)

Protection claims 20 25 YE 35 Height adjustment device for furniture, in particular for height-adjustable tables, with a telescopic column made of two telescopic tubes that can be moved relative to one another, a square inner tube and a square outer tube, and a pinion that is rotatably mounted on one of the two telescopic tubes and meshes with a rack on the other of the two telescopic tubes during the adjustment process, and with a helical compression spring for weight compensation between the two telescopic tubes, characterized in that the pinion (8) is mounted freely rotatably on one of the two telescopic tubes, preferably on the square inner tube (2), in such a way that when the telescopic column is adjusted it runs along without drive in the rack (7) attached to the other telescopic tube, preferably the square outer tube (3), and that an unlockable locking device engages in the pinion (8), which locks the pinion (8) between the telescopic tube or square inner tube (2) and the Rack (7). AdWMutrillti 46A THeton: (0228) 22108« rtJ21819 Dtuttch* Bank AQ Bonn Po«Uch»ekKonlo Cologne (BU ,17010050) 188927-501 2. Height adjustment device according to claim 1, in particular for height-adjustable tables, with a helical compression spring that supports the weight of the table top, characterized in that the rack (7), the pinion (8) and the locking device in the space between the two telescopic tubes (2, 3) are arranged, and that the Helical compression spring (19) the telescopic tube arrangement (2, 3) practically along its entire length. 3. Height adjustment device according to claim 1 and 2, characterized in that the rack (7) is preferably attached to the outer telescopic tube (3) and the pinion (8) with the locking device is mounted on the inner telescopic tube (2). 4. Height adjustment device according to claim 1 and 2, characterized in that a remote control for the locking device is preferably assigned to the movable part (2) of the telescopic tube arrangement (2, 3). 5. Height adjustment device according to claim 1 and 2, characterized in that the locking device is a locking slide (10) engaging in the pinion (8) which is displaceable on the telescopic tube or on the square inner tube (2) with the pinion (8) transversely to the axis of rotation of the pinion (Q) in the longitudinal direction of the telescopic tube or the square inner tube (2) against the pressure of a spring (16). 6. Height adjustment device according to claim 5, characterized in that the Locking slide (10) on the telescopic tube (2) by means of • · « t · t * a cross slide (14) is longitudinally displaceable, and that a driving pin (13) protruding laterally from the cross slide (14) or from the locking slide (10) engages in an inclined slot (12) on the other part of the slide arrangement, i.e. on the locking slide (10) or on the cross slide (14), in such a way that when the cross slide (14) is displaced, the locking slide (10) in Longitudinal direction of the telescopic tube or the square Inner tube (2) from the teeth of the pinion (8) is lifted out or under the action of a return spring (16) into the teeth of the pinion (8) intervenes again. 7. Height adjustment device according to claim 6, characterized in that the cross slide (14) can be fixed relative to the telescopic tube or relative to the square inner tube (2) by a locking screw (20). 8. Height adjustment device according to claim 6 or 7, characterized in that the cross slide (14) is displaceable relative to the telescopic tube or the square inner tube (2) in elongated hole guides (21) and engages behind the telescopic tube or the square inner tube (2) with a leg (23) which is angled to the side transversely to its displacement direction (22), on which the locking screw (20) is arranged so as to be adjustable in the displacement direction (22). 9. Height adjustment device according to claim 8 _r , characterized in that on the shaft of the locking screw (20) a Telescopic tube or return spring (16) supporting the square inner tube (2) is provided for the cross slide (14). 10. Height adjustment device according to one or more of claims 6 to 9, characterized in that the cross slide (14) is connected to a tension element (22), such as a tension rod, tension band or by means of a rocker (17) which is pivotably mounted on a cantilever arm (23) protruding to the side from the telescopic tube or from the square inner tube (2). 11. Height adjustment device according to one or more of claims 6 to 10, characterized in that the cantilever arm (23) with the rocker (17) has a bendable end section (24) which can be fixed in different height positions in relation to the square inner tube (2) in such a way that the rocker (17) can be adjusted as required in the immediate vicinity in particular of an associated table top (15) or another support device. 12. Height adjustment device according to one or more of claims 1 to 11, characterized in that it is designed as a self-contained unit for installation in height-adjustable tables or furniture.