EP1106111B1 - Return device for a chair, in particular for a bar-stool - Google Patents

Description

The invention relates to a reset device for a seat device, and in particular relates to a reset device for a bar stool.

Bar stools are well known. However, they have the disadvantage that you sit on them very static. The back muscles relax on long evenings the user which leads to an unfavorable sitting position. On Most of the population does a sedentary job in the office during the day also contributes to the degeneration of the back muscles. Sit especially those People with already weakened back muscles even in the evening on static ones Bar stools, this usually leads to an unfavorable sitting posture and from it resulting back pain. Through a persistent, even load of the intervertebral discs these are extremely poorly supplied with blood, which is permanent Can result in back damage. When sitting on bar stools comes a disadvantage added that the legs hang diagonally down and therefore most users tend to form a hollow back. This sitting posture is considered uncomfortable perceived, the bar visitor supports himself on the bar, which in turn increases leads to a very one-sided load on the intervertebral disc.

Document WO-A-96 24 273 shows a reset device for a seat device, in particular for a bar stool, with an essentially cylindrical intermediate part of a substructure a seat part, which intermediate part can be tilted on a foot part and resettable held by the reset device is, the direct connection between the foot part and Intermediate part by means of a made of elastic material Rifle that is between both the side walls and the End walls is arranged takes place.

Because the intermediate part can be tilted and reset directly on the foot part is, the user always oscillates slightly back and forth. This keeps the back muscles also always slightly moving and the intervertebral disc is well supplied with blood.

Thanks to a springy intermediate part, the bar stool swings even with the smallest Movement in its longitudinal axis so that the back muscles are constantly in motion remains and also the intervertebral disc is not subjected to any static load.

The object of the invention is to improve this known seat device.

The object is achieved in that a reset device is provided according to claim 1.

According to the invention, the foot part has a fixed shaft and the hinge point between the foot part and the intermediate part is at the upper end of the Shaft.

The fixed shaft ensures that the hinge point does not close far from the seat and thus the pendulum movement on a cheap Extent is limited. On the other hand, if the pendulum point were on the ground, the commute is too large for a bar stool and safe use by inexperienced users People no longer possible.

Furthermore, it is favorable to have a foot ring in a predetermined position on the shaft Distance from the floor. The foot ring is firmly locked on the shaft and thus almost fixed. The user can thus place his feet on the foot ring and has a secure, steady hold despite the swinging buttocks and upper body by putting his feet on the ring. Advantageously, the height of the foot ring on the shaft is adjustable, which means that optimal coordination can be made to the user.

A preferred embodiment provides that the resilient intermediate part a central pillar and a spring structure, the power flow of the Seat weight, the central column and the spring construction are connected in series.

By connecting the two parts in series, the height of the central column can be adjusted be formed without affecting the suspension about the longitudinal axis becomes.

In this advantageous embodiment, it is further advantageous that the central Column and the spring structure are arranged concentrically and between the central pillar and the spring structure a bearing guide is formed. By the concentric arrangement of the central column and spring construction makes it possible the series connection of the central column in a relatively compact arrangement and to realize spring construction. This is very important because - as mentioned above - the tipping point should not be too far from the seat may and thus a mere string of central pillar and spring construction would move the tipping point too far towards the foot section.

The spring construction advantageously has a dynamic and static spring mount between which a spring is clamped. Through this relative simple structure, it is possible to use a cheap standard part spring.

The central column is advantageously in the form of a spring column which is adjustable in length trained, e.g. a gas spring and has at least one vertical guideway which interacts with the warehouse management.

The bearing guide conveniently comprises a vertically spaced one two-part storage, preferably balls or rollers as bearing elements Find use.

In a particularly preferred embodiment, the bearing elements are spring-loaded pressed against the guideway. When using non-spring loaded Bearing elements are manufacturing inaccuracies in the pendulum and swinging movement very noticeable and have a great effect on active, dynamic sitting annoying.

It is favorable to have at least two bearing elements on the guideway per bearing to arrange.

The bearing elements are advantageously held in bearing element receptacles, the bearing element receptacles either via compression springs, or via an elastically deformable area, or via an elastic projection the bearing elements press on the guideway. The compression springs or the elastic deformable area or the projections press the bearing elements radially Inside.

The guideway is advantageously designed as a tube, the first end of which the lower end of the spring column and its second end with the dynamic End of the spring holder is connected.

Furthermore, it is convenient to place between the guideway tube and the spring column, which is preferably designed as a gas spring to arrange a plain bearing bush. With an active-dynamic continuous pendulum swinging movement around the Longitudinal axis of the intermediate part primarily springs the spring construction and only minimal the gas spring, so that the plain bearing bush primarily in the height adjustment used.

The bearing guide is preferably arranged on a main leg base in which the spring mounts spring loaded and held radially displaceable are. Due to the spring-loaded bearing elements, dimensional inaccuracies balanced and there is thus an even, trouble-free and almost silent swinging around the longitudinal axis of the intermediate part.

The main leg body is preferably via a wedge connection on the shaft attachable to the foot section.

It is favorable that the distance between the dynamic and the static spring mount can be adjusted. For this purpose there is a rotatable one on the main leg base Cap nut designed as a spring support over which the spring can be biased. The pendulum stool can be opened by pretensioning the spring adjust the weight of the people, so that the seat does not sit down drops uncomfortably far or slightly. This biasing mechanism is advantageous formed by a rotatable union nut on the main leg base, via which the spring is biased or relaxed by turning the union nut can be.

The reset device is conveniently a vibrating metal between the intermediate part and the foot section and can be adjusted via a handwheel in the restoring force can be set.

Fig. 1 den Pendelhocker in einer Seitenansicht sowie in einem Halbschnitt,

Fig. 2 den unteren Abschnitt des Zwischenteils aus Fig. 1 in einer größeren Ansicht,

Fig. 3 den Bereich des Zwischenteils mit der Lagerführung,

Fig. 4a den Querschnitt durch das Zwischenteil im Bereich der Lagerführung,

Fig. 4b einen vergrößerten Ausschnitt aus der Fig. 4a,

Fig. 4c eine Ausführungsvariante zu Fig. 4b,

Fig. 5 eine Schrägansicht von Schaft und Fußring, und

Fig. 6 einen Querschnitt einer Variante des Schaftes.

The invention is explained in more detail below with reference to exemplary embodiments shown in the drawing. It shows:

1 the pendulum stool in a side view and in a half section,

2 shows the lower section of the intermediate part from FIG. 1 in a larger view,

3 shows the area of the intermediate part with the bearing guide,

4a shows the cross section through the intermediate part in the area of the bearing guide,

4b shows an enlarged detail from FIG. 4a,

4c shows a variant of FIG. 4b,

Fig. 5 is an oblique view of the shaft and foot ring, and

Fig. 6 shows a cross section of a variant of the shaft.

Fig. 1 shows a side view and a half section of a pendulum stool, consisting from a seat part 1, an intermediate part 3 and a foot part 2. The intermediate part 3 has a central column 4 and a spring structure 5 and is on its lower end in the foot part 2 can be tilted and reset. The central one Column 4 is designed as a height-adjustable spring column 10, usually as a gas spring. The seat part 1 is firmly connected to the spring column 10 via a plug connection 22 and can by a bearing 23 at the lower end of the spring pillar 10 around rotate the longitudinal axis of this spring column. For the height adjustment of the seat 1 a lever 24 is arranged on the underside, which when actuated so on the spring column acts that this can be adjusted in height in a known manner. The central column 4 further comprises a vertical guideway 11 which formed as a tube surrounding the spring column 10 and at the lower end with the Spring column 10 is rotatably connected via the bearing 23.

The central one is to achieve the desired active-dynamic sitting behavior Column 4 in the power flow, the spring construction 5 connected in series.

A reverse arrangement, in which the power flow only over the spring construction and then done through the central pillar is also possible.

The spring structure 5 consists of a static spring mount 8, a spring 9 and a dynamic spring holder 7. The dynamic spring holder 7 is firmly connected to the upper end of the guideway 11. For the rolative movement between the central column 4 and the spring structure 5 is between the Spring construction 5 and the guideway 11 a bearing guide 6 is formed. The Bearing guide 6 consists of two bearings in the illustrated embodiment 12, which is held in the upper holding part of a leg base body 15 are. The main leg body 15 forms the lower end of the central column 4 and is attached to the construction of the foot part 2 via a wedge connection 16. The main leg body 15 has an external thread in its lower region on which a union nut 17 is screwed, which at the same time as Pad for the spring 9 is used. The spring 9 can be biased by the union nut 17 and thus the length by which the seat 1 sinks under load, be matched to the weight of the user.

The intermediate part 3 is connected to a reset device 21 via the wedge connection 16 attached to foot part 2. The reset device 21 is designed as a vibrating metal and consists of a substantially tubular upper part 25, the upper End used for wedge connection 16 and a lower part 27 which is fixed to one Arm 31 of the foot part is attached. A shaft 40 is attached to the lower part 27. The shaft 40 is received on the underside within the lower part 27 and encompasses the upper part 25 in a cup shape between the upper side of the Shaft 40 and the upper part 25, an elastic material 26 is provided. This is arranged both between the end faces and between the side walls. The upper part 25, the shaft 40 and the lower part 27 are via a screw 29 connected to each other, with one interacting with the screw 29 Adjusting nut 28 prestressed the restoring device 21 and thus the restoring force can be adjusted. In an embodiment variant shown in FIG. 1 is another elastic between the head of the screw 29 and the upper part 25 Element 30 arranged, which the behavior of the reset device 21st designed softer and more comfortable.

On the cylindrical outside of the shaft 40 is a cuff 52 Foot ring 50 attached. The cuff 52 has a threaded bore with an adjusting screw 53, via which the foot ring 50 is locked on the shaft 40. By Loosen the set screw 53, the foot ring 50 in the area of the shaft 40 in the Height can be set.

The foot part 2 is generally designed as an almost closed ring, on which centrally via the arm 31, the reset device 21 and thus the intermediate part and the seat part are supported. When loaded, the arm 31 deforms elastically, so that the pendulum stool via a friction-promoting contact device 33 on lower end of the reset device 21 is pressed onto the floor.

Rollers or balls 34 are arranged in the annular base part 2 of the pendulum stool, which deflect into foot part 2 when loaded. It could also be roll or balls according to DIN standard are used, which in the spring-loaded state are locked, allow the pendulum stool to be moved under light loads and deflect into the foot section 2 when fully loaded.

2 shows the lower part of the intermediate part 3 and the reset device 21 of the pendulum stool from Fig. 1 in an enlarged view. The foot ring 50 is in this View not shown. With active-dynamic swinging around the longitudinal axis of the intermediate part 3 there is a relative movement between the guideway 11 and the spring construction 5. This relative movement is due to the above mentioned bearing guide 6 between the spring structure 5 and the guideway 11 allows. This bearing guide 6 is explained in more detail in the following figures. In the extended state, the path of the spring 9 is stopped by a stop 35 limited at the lower end of the vertical guideway 11. This stop 35 interacts with a shoulder on the main leg body 15. To limit the distance To make it silent upwards is between the main leg body 15 and the stop 35 interposed a rubber ring 36. For path limitation downward is an elastic stop above the head of the screw 29 32 provided.

Fig. 3 shows the section of the intermediate part in which the bearing guide 6 is arranged is. The bearing guide 6 consists of two in the illustrated embodiment Bearings 12, which are held in the leg base body 15 and with the guide track 11 cooperate. The bearings 12 have four per level on the circumference of the guideway 11 on bearing element 13, these bearing elements 13 can be designed either as rollers or as balls. (Please refer see also Fig. 4a). In the illustrated embodiment, the bearing element 13 formed as rollers, the roller axes on both sides in bearing element receptacles 18 are included. These bearing element receptacles 18 are in the main leg body 15 held radially displaceable to a certain extent and in the direction of Guideway 11 spring loaded. There are two versions for spring loading shown. In the first variant, the bearing element receptacles are supported 18 via compression springs 19 on one of the main leg bodies 15 surrounding pipe 37 and thus press the bearing elements 13 in the direction of Guideway 11. The tube 37 is from above over the upper tubular area of the main leg body 15 and interacts with the main leg body 15 to fix bearings 12 together.

In the second exemplary embodiment, the bearing element receptacles 18 each have an elastic projection 20, which due to its elastic deformation likewise the bearing element receptacles 18 and thus the bearing element 13 against the Guideway 11 presses.

4a shows a section through the bearing 12 already described in FIG. 3, 4b shows an enlarged detail from FIG. 4a, this embodiment variant represents the spring loading of the bearing elements 13 via compression springs 19, which are supported on the tube 37.

4c shows the same detail as in FIG. 4b, but in a different one Embodiment. 4c, the bearing receptacles 18 have the elastic projection 20, which is also supported on the tube 37 and thus the bearing elements 13 presses against the guideway 11.

Fig. 5 shows an oblique view of the shaft 40 with the foot ring 50 attached Shank 40 is essentially cylindrical and has at its lower End a paragraph 41. With its lower end, the shaft 40 can fit snugly be inserted into the lower part 37, so that there is an overall smooth cylindrical Outside surface results. At the top (not shown in the figure) is the Cup 40 cup-shaped for receiving the elastic material 26 and the Upper part 25 is formed.

In the middle, the shaft 40 has a channel 42 for receiving the screw 29, which serves to bias and adjust the reset device 21.

The shaft 40 is usually designed as an aluminum die-cast part, with between the outer wall and the channel 40 additionally stiffening ribs 43 are provided could be.

The foot ring 50 is fitted over the collar 52 on the outer circumference of the shaft 40, which can be locked on the shaft 40 via the adjusting screw 53. The foot ring 50 is connected to the cuff 52 via struts 51 and points in usually have a diameter of approx. 500 mm.

6 shows a further embodiment variant of the shaft 40, the shaft here is made of solid material as an aluminum turned part. The shaft also has the Channel 42 for the screw 29 and the paragraph 41. The shaft can be in different Lengths be formed. The fact that he easily in the lower part 27 can be inserted is an adjustment over the length of the shaft the bar stool height to the needs of the user easily possible. Only that Screw 29 must be adjusted to the length of the shaft.

The invention is not limited to the exemplary embodiment shown, but rather includes all bar stools, which an active dynamic sitting in the sense of the claim Allow 1.

Claims (9)

1. Return device for a chair, especially for a bar stool, comprising a mainly cylindrical intermediate part (3) of a support part of a seat part,
   which intermediate part at a foot part (2) is held tiltable and returnable by means of the return device (21), wherein
   the foot part (2) comprises a fixed shaft (40), at the upper end of which near the seating part the hinge point is between foot part and intermediate part so that the extent of the pendulum movement of the seat part is restricted, wherein
   between the shaft (40) and the upper part (25) an elastic material (26) is provided, and wherein
   the elastic material (26) is arranged between the side walls as well as between the frontal areas.
2. Return device according to claim 1, characterized in that between the intermediate portion (3) and the foot part (2) the return device (21) is provided as rubber-metal swing connector.
3. Return device according to claims 1 to 2, characterized in that the return force of the return device (21) is adjustable.
4. Return device according to one of the claims 1 to 3, characterized in that the intermediate portion (3) is mounted onto the return device (21) by way of a spline connection.
5. Return device according to claim 4, characterized in that a mainly tubular upper portion (25) of the return device (21) with its upper end serves as spline connection (16), as well as with a bottom part (27), which is fixed on an arm (31) of the foot part (2).
6. Return device according to claim 5, characterized in that the shaft (40) is mounted on the bottom part (27), wherein the bottom side of the shaft (40) is included within the bottom part (27) and the upper part of the shaft (40) embraces the upper part (25) like a cup.
7. Return device according to claims 5 or 6, characterized in that the upper part (25), the shaft (40) and the bottom part (27) are connected with each other by a screw (29), wherein the return device (21) is acted upon with an initial stress by a an adjusting nut (28) cooperating with the screw (29).
8. Return device according to claim 7, characterized in that between one head of the screw (29) and the upper part (25) an additional elastic element (30) is arranged.
9. Return device according to one of the claims 1 to 8, characterized in that at the lower end of the return device (21) a contact device (33) enhancing friction is provided, which can be brought into contact with the floor.

Images