DE7330152U - SEATING FURNITURE - Google Patents

Description

8/30/76 Lü / Kn. ft

Christof Stoll KG, 7890 Waldshut (Germany)

Seating

The invention relates to an office swivel chair with a backrest that is adjustable in inclination and height.

The task of adjusting the backrest inclination is to determine the seat depth, i.e. the horizontal distance between the front edge of the seat and to change the front of the backrest. This can be done in a known manner by means of a horizontal adjustment or an inclination adjustment of the backrest carrier.

The backrest height adjustments have the task of adjusting the backrest height, i.e. the vertical distance between the seat and the backrest

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to change.

Both adjustments serve to adapt the chairs to the different anthropometric data of the human body.

There are tilt adjustments and height adjustments known, where the backrest can be adjusted in more or less fine steps. There are also continuously adjustable inclination and height adjustments known. Furthermore, adjustments are known in which one and the same actuating element the inclination and height adjustment is inevitably influenced. Inclination adjustments are also known, in which the firmly lockable adjustment area is optionally followed by a freely movable area. In the As a rule, a compensating spring acts in this area, which corresponds approximately to the pressure of a human upper body, and by slightly tilting the top

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posture, i.e. the seat angle (angle between thigh and upper body). With this the idea of the "dynamic Sitting ", i.e. a body movement through a constantly changing sitting posture, is taken into account.

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For adjustable in increments tuners but are usually € _e levels too big, they that exceed the limit of about 2 °, from where to human perception, the steps begin to clearly feel and even intermediate gradations wishes. Stepless tilt and height adjustment mechanisms do not have this disadvantage, but they are usually based on Pestklemm- or principles of the inclined plane. They therefore tend to automatically and unintentionally adjust during use and / or require very high plague setting and loosening forces.

Such inclination and height adjustments where a central Eggs inevitably affect both punctures, hc.jen has the disadvantage that an L. Puncture the other is undesirably adjusted with. Handling also requires considerable dexterity, which is not in the sense of problem-free operation,

SiTiBT change the known executionSiOrni must use one and the same actuating device to cause different stimulation functions, but this often leads to incorrect actuation, be it due to the lack of technical memory of the ijenutaersc, or be it because of not precisely enough executed control movements »

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Such inclination adjustments in which the permanently lockable adjustment range is followed by a movable one, have the disadvantage that the possible adjustment range between the still sensible, foremost, upright sitting posture and the rearmost one, before the chair tends to tip over, must be divided into two areas. Users that basically prefer either a firmly locked or an adjustable backrest angle, you lose one possible Usage area, as the total possible area is divided into two sectors.

In all known tilt adjustments, the pivot point is the mechanics are designed according to constructive and not ergonomic aspects. This is the result of the usual pushing back the backrest with the upper body an upward relative movement between the back of the user and the back, the so-called "shirt pull-off", i.e. the clothes is pulled by the shift between the living cushion and the back of the user =; ach up.

A disadvantageous feature of known backrest height adjustments is that the backrest bar is always designed in one piece as a backrest support. So it always protrudes more or less a little bit by η from the inclination or horizontal position

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mechanics out. The backrest on the vertically fixed backrest rod moved up and down, so ttber: In the end position of the backrest rod the backrest. Both look not only ugly, but can also lead to unwanted property damage or even personal immissions or injuries.

It is the object of the invention to address the disadvantages of the known seating furniture with regard to the backrest inclination and height adjustment avoid.

The backrest inclination and height adjustment according to the invention is intended in particular

- avoid the shirt pulling effect,

- allow either dynamic or static stranding,

- do not have any protruding ends of the backrest rod,

- enable simple and easily distinguishable operation, and very special

■ to produce animals technically with the highest rationalization effect be.

The object is achieved in that, in an office swivel chair ("he mentioned above." open _s one leg of the angle lever forming the outer box is mounted on a pivot pin, and the

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The outer box has at its free end a guide tube forming the other leg of the angle lever for the telescopic guidance of the backrest rod carrying the bridge arm at its free end, and a tension spring acting as a backrest recoil spring is provided between the outer box and the seat plate carrier.

Thus, the object set forth above is satisfied, and in particular the basic concept of modular systems implemented, can produce from it using the same Qrundteile by omitting or adding parts in the final assembly Lehnenneigungs- and -höhenverstellungen from which, although aufweinen all ergonomically important basic functions, however, taking into account the sales price, have greater or lesser ease of use *

In the case of the seating furniture according to the invention, the full inclination area is used. The inclination can be adjusted and locked in steps that are smaller than the critical human perception. However, it can also be changed by varying the leaning pressure against a compensating force in the sense of a constantly changing sitting posture (so-called dynamic sitting).

The pivot point of the backrest inclination lies in a geometric area in which the vertical relative movement on the back of the

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User - caused by the pendulous movement of the Backrest - is negligibly small.

The backrest support rod is part of the height adjustment mechanism designed in two parts, the upper part of which slides telescopically into the lower part, so that no rod end can protrude from the mechanism below or above the backrest.

Each puncture of the height and inclination adjustment has its own special, unmistakable actuation device, so that mix-ups and incorrect actuation are excluded.

All adjustments only need to be carried out with one hand. The second hand is not needed, as is the case with the known mechanisms, to bring the loosened parts into the desired new position and hold them there until they have been locked again with the other hand.

Further features and advantages of the invention emerge from the exemplary embodiments explained below with reference to the drawings.

Here shows:

1 shows the seat rotatably mounted on a pedestal an office swivel chair with the backrest inclination and height adjustment according to the invention in an inclined state, essentially schematic, in side view,

Pig. 2 the backrest angle and height adjustment according to Pig. I. when not tilted and facing Pip ,. 1 enlarged, again essentially schematically and in side view,

Fig. 3 does not show the backrest inclination and height adjustment inclined state in a practical version, again in side view,

Pig. ¹ J the backrest inclination and height adjustment in plan view according to section AB in Fig. 3 »

FIG. 5 shows the backrest inclination adjustment according to FIG. 3 with a reduced Ease of use,

6 shows a clamping device according to section A-B in FIG. 5,

7 shows a device for pretensioning the backrest return spring,

8 the backrest height adjustment in detail,

Fig. 9 the backrest height adjustment with reduced loading

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ease of use,

10 shows a backrest height adjustment as in FIG. 9 »but in a modified technical embodiment, and

11 shows a locking device for adjusting the backrest inclination in opposite to that shown in Figs. 1-4 Amended form.

In the figures 1 - ¹ I a backrest inclination and height adjustment according to the invention is shown with increased ease of use.

The inner box 1 is firmly connected to the bracket 2 of the seat plate of the seat 10, advantageously by means of detachable fastening parts such as screws 3. The inner box 1 is enclosed by the outer box 1 and is connected to the inner box in a hinge-like manner via the pivot pin 5. The toothed segment 7 is rotatably located in the inner box 1 around the bolt 6. The toothed segment 7 is connected to the movable outer box H by the bolt 8, the bolt 8 not being supported directly in the toothed segment 7, but via the sliding block 9. The sliding block 9 serves as a kind of link guide to the relative path caused by the rotary movement

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of the outer box * J around the bolt 5 and the tooth segment 7 around the bolt 6 is created to compensate.

The toothed segment 7 is locked in the various positions by the locking pin 11 of the pawl 12. The pawl 12 is rotatably mounted within the inner box via the bearing axis 13 in the inner box 1, the central The position of the pawl 12 and the plug-in assembly by the spacer sleeve 14 and the bearing bush 15 is determined. On el am extended end of the Lagerachsc 13 sits firmly connected to the actuation button 16. On an extension nose of the pawl 12, the spiral spring 17 is suspended, the second leg of which is supported on the bolt 5.

It acts as a "dead center spring" as follows:

If the actuation button 16 is pressed upwards, the pawl 12 snaps downwards ("rocker switch"). Your locking pin 11 is pressed by the force of the spiral spring 17 ir the closest tooth gap; the backrest tilt mechanism is locked in the relevant position. If the actuating button 16 is pressed down, the lock is released. The spiral spring 17 holds the pawl 12 in the upper position _s by means of its spring force after it has been moved over a "dead center". The segment is unlocked and

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frri movable; the backrest position can be changed by pressing against the backrest 18.

Both the movements of the operating handle 16 of the pawl 12 - raising and lowering - as well as the position on the seating furniture at the back avoid mix-ups, are ergonomically sensible and easy and unmistakable to reach.

The adjustment with notches, i.e. by means of a form fit, was chosen because it absorbs considerable forces and a high level of operational safety and ßedj. comfort results.

The control via the toothed segment 7 represents a kind of translation This solves the problem, the individual steps' from wheel position to locking position on the one hand and the On the other hand, to keep the structural dimensions of the mechanics small, i.e. not to exceed a certain size.

The distance or lever arm on the toothed segment 7 between the pivot point 6 and the bearing point Gleits ^ a 9 and the locking point of the teeth 11 is held differently p- ^ qsf , Es ergi '; an advantageous decomposition ratio or transmission

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ratio, ie: a large path in the tooth area is assigned a small path in the change in the backrest inclination. The forces behave in reverse. The teeth of the segment and the locking bolt 11 of the pawl 12 can be designed to be correspondingly large and strong, which brings advantages in terms of manufacturing and pestibility. On the other hand , the change in the inclination of the backrest from tooth to tooth can be kept desirably small, ie in a range that is at the limit of human discernment,

The bearing point of the outer ^ astens ^ in the toothed segment 7 at the Gltfitstein 9 is close to the bearing of the outer box Ί on the bolt 5, so that small vertical movements of the bolt 8 large vertical movements of the outer box Ί have an effect at its free end "

The tension spring 19, which acts as a backrest recoil spring, ensures that the backrest is always pressed against the back of the user when the backrest inclination lock is released and the desired backrest inclination adjustment is achieved by the counter-pressure exerted by the user di3. Accordingly, it resembles designed uarüber addition, the normal, static backrest pressure "." Nes user au j and thus enables a stet "g changeable by the Anlehndruc posture ACCORDING TO ^rl he

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current required or desired work posture of the user (dynamic sitting). The backrest spring 19 can be designed according to the statistical mean lean pressure of the user or by means of a variable preload (Fig. 7) can be individually adjusted, e.g. by means of a threaded rod 20 and a threaded locking button 21.

The backrest recoil spring is designed as a tension spring and is attached at a point where there are large Pedor paths. Compared to the usual fly or gate springs from this the advantage that inevitable construction tolerances the spring on the restoring forces of the backrest as o-ut as none Can have an impact. In addition, spiral springs are heavier and more expensive for such forces.

The inner box 1 and the outer box 4 are on three sides closed to sjin against torsional movements "/ ^ eif. All bearing points are designed to be maintenance-free, i.e. free of lubricants that have to be applied subsequently. through bearing bushes made of oil-soaked sintered metal or plastic, etc., which have correspondingly good running properties.

In FIGS. 5 and 6, a backrest inclination adjustment is provided

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shown reduced ease of use, whereby a cheaper version of the chair according to the invention results.

This version does not have parts 7, 6, 8, 9, 11, 12, 13, U, 15, 16, 17 of Fig. 1 - Ί, so that only the over the pivot pin 5 connected to the inner box 1 outer box * »Remains. Through the outer and inner box g, eht now the threaded bolt 22, the spacer washers 23 the construction distance between the outer and inner box and the Spacer sleeve 24 the construction distance zvdsehen the inner box walls bridge. About the bracing nut 25, which can be designed in a known manner as a star grip, toggle or the like can, in order to enable a correspondingly high tightening torque, the inner and outer boxes are in the sense of a screw connection frictionally clamped against each other.

The inner and outer boxes have either a round hole or an elongated hole as a passage for the threaded bolt. For optical reasons, the outer box 4 is advantageously provided with a round hole on the right and left, one of which is known Way has a local recess into which a nose of the threaded bolt engages and thus a twist = Securing the threaded bolt 22 causes. The inner box 1

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has an elongated hole on the right and left, which is the size of the Adjustment range determined and at the same time serves as an end stop.

The bracing nut 25 can be tightened or left loose in any desired position of the total adjustment range. In the first case it enables the backrest to be infinitely adjustable, and in the second case it is already called "dynamic change of sitting posture".

For production, it is important that the mounting and fastening holes for both the toothed segment and fttr the clamping connection mechanics on the corresponding parts are provided from the outset at the same time. So that's the The decision as to whether the simpler or the more comfortable version should be produced is only necessary during final assembly.

The backrest height adjustment with greater ease of use is described with reference to Figs. 1 - M and 8:

The FührungsroriV 26 is fixedly connected to the outer box ¹ I. The backrest rod 27 protrudes into the guide tube from above. The guide 28, which prevents the metallic parts from moving, is located between the guide tube and the backrest bar

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Touch the guide tube and backrest rod directly. It continues to take over storage tasks when the backrest rod 7 moves axially moves up and down in the guide tube 26. The guide consists primarily of plastic and is against axial displacement once through the upper edge, on the other hand through a clip 29 secured, which, inserted into a corresponding cutout of the guide, pressed down together with the guide, snaps into a corresponding opening in the guide tube with holding tongs.

The vertical movement of the backrest rod is brought about by rotary movements on a handwheel 30. The handwheel 30 is form-fitting connected to the shaft of the bevel gear 31, which in turn has a bevel gearing in a known manner Pinion 32 drives. Bevel gear and pinion can be inexpensive be cast from plastic or metal, the pinion is positively connected to the spindle 33, which has a thread, preferably a trapezoidal thread. The spindle runs in a nut 34 which is fixed or movable connected part of the spindle clip 35 is. The spindle clip 35 is fastened in the backrest rod 27. Does the spindle turn so the mother walks up and down her in a familiar manner; the backrest rod is moved accordingly.

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The entire transmission is self-locking, i.e. it is The coefficient of friction is greater than the angle of incline. The weight of the backrest and the backrest rod on the spindle and From a static point of view, loads by a user do not cause any change. Short, jerky loads and shocks, however, can cancel the friction for fractions of a second, then self-inducing the backrest height can be unintentionally adjusted, inhibition is lost during this time / around this undesirable To switch off the effect, one of the gear parts, in the illustration the shaft of the pinion pinion 32, is replaced by a Clip 36 in the form of a hairpin leaf spring is advantageously acted upon on both sides. For all axial impacts and the like, the gear clip 36 maintains the frictional connection with the pinion pinion and prevents the described micro-adjustments. On the other hand, the spring force can be relatively weak, so that it provides the necessary rotational forces on the Handwheel only slightly increased. It is advantageous if the shaft of the pinion, which is round per se, has the shape of a cross-section To give polygons, e.g. octagon, and to reproduce the spring in the correct shape of a corner of the polygon, so that in addition a supporting form fit is created * ··.

All parts of the backrest mechanism are for the purpose of quick, simple and therefore cost-saving assembly

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Dismantling designed as self-locking plug or clip connections . This applies to the handwheel 30, the pinion 32, the gear clip 36 and the spindle clip 3 £.

The backrest height adjustment with reduced operating comfort is described with reference to Fig. G and φ :

The parts handwheel 30, bevel gear 31, pinion 32, spindle 33, nut 3 ^ 1 and gear clip 36 of Fig. 8 and Ί are omitted.

The locking of the rest rod is now done by a locking pin 37 which is fixedly connected to the Verriegelungsc ^ ip 38th The locking clip consists of one part, is advantageously made of spring steel and, according to the invention, fulfills the functions of a hinge including a hinge bearing and a return spring. The middle tongue 39 of the locking clip is firmly connected to the guide tube 26, for example riveted. The free leg of the tongue carries the remaining part of the locking clip and the socket pin, acts as a spiral spring and can at the same time absorb transverse forces acting on the socket pin as bending or tensile and compressive forces. It is advantageous to give the tongue a certain pre-tension so that aie part around the socket pin is pressed against the guide tube.

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The peripheral edge 40 of the locking Eclipses has two cam 4, on the guide tube, that is, on the portion with which the clip is firmly connected, rest. If the lower end of the edge is pressed (opposite the end with the bolt), the tongue 39 with the bolt 37 is resiliently bent back as if by a kind of hinge. The bolt releases the backrest rod and the lock is released. If you let go of the locking clip, it will automatically spring back into the locking position. If the part to be locked, in the present case the backrest rod «? 7, has been moved in such a way that the bolt does not hit a locking hole, it rests on the backrest rod and automatically snaps into it; I ce locking hole when the backrest rod is displaced or shifts itself.

The carrier of the clip, the guide tube 26 and the guide 28 have a through hole for the bolt 37. The backrest rod 27 has a series of locking holes ^ 2, which locks the different positions of the backrest result. While one hand depresses the locking clip, the other can move the backrest rod into the desired position.

Fig. 10 shows a locking clip in which the bolt 37 is not a special T ^ iI, but is made from the clip itself.

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is formed as a U-shaped or as a flap exposed part.

For optical reasons, the clip can be covered by a cladding ^ 5, for example made of plastic, but a tight fit can also be implemented in a manner known per se by means of a self-locking plug connection.

The actuation of the backrest inclination adjustment described in FIGS. 1-4 by means of "rocker actuation" requires a down and up movement on the actuation button 16 when one of wants to get into another position in a fixed position.

In Fig. 11 in contrast, is a locking device for the toothed segment 7 of Fig. 1 - represented h _s in which the pawl 12 nit stop bolt 11 'impact-only counter to a return spring kS to / k of the retaining spring "J is raised to the latch release and allow backrest angle change. If the traitor-.egelungshebel lo-left, it engages automatically in the nachgelegene screening. a defined movement must by the user so do not be executed. When the lever is further pulled hl in the retaining spring up, then the backrest lock remains released

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is then achieved again in the manner described, v / enn the operating lever is pushed down and thus out of the retaining spring.

As already mentioned, all connections are for the purpose of :. Facilitation of assembly and service as far as possible as plug-in connections executed:

The handwheel 30 has ribs on the inside which serve as stiffening ribs on the one hand and on the other hand Appropriate recesses in the shaft of the bevel gear 31 grip. Due to this Pormschluss, the torque can be used without Transferring axial components from handwheel 30 to bevel gear 31 will.

The axial tight fit is achieved by running the all around Groove in the shaft of the handwheel 30 in a corresponding The ring snaps into the bevel gear. In order to be able to squeeze (spring) one, the shaft of the handwheel is cylindrical in itself 30 divided into axial: · .- direction several times, so that it is resilient Individual segments are created that also point outwards. A slope at the free end of the shaft favors this Assembly, bevels on the groove allow dismantling,

The gear clip 35 at the pinion 32 is through two slots

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plugged into the outer box 4, the retaining tabs automatically spring back. The angle of incidence of these tabs is chosen so that the clip without the tabs from a third party to bend back, does not detach itself from the outer box, but maintains its fixed position. At the same time when it is pushed open The legs of the clip spread apart and slide over the Bevel gear.

The two resilient legs of the clip 35 grasp with their retaining lugs in two holes of the backrest rod 27. One Run-up bevel at the end of the legs enables a simple Slide-on assembly. The angle of attack of the holdasan ensures that the clip cannot slide back due to the application of force. Opposite forces are caused by attacks of the clip added against the end of the backrest rod, so that the inserted and thus mounted Clip grants a snug fit in both directions. Dismantling takes place in that both legs are bent back, whereupon he can be pushed back.

All these clip or plug connections have in common that they consist of only one part consisting of several punctures, such as supporting forces in different directions and automatic tight fit, etc., to which in the conventional

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union construction two or more parts are necessary.

In conclusion, it must be stated again that it is special The advantage is that the seating furniture according to the invention has a mechanism with great ease of use In the modular system, a simpler, cheaper mechanism can be derived without changing the corresponding parts can by adding or omitting parts. All ergonomically correct punctures are retained; only the ease of use is restricted in the sense of value analysis ideas with the cheaper mechanics. The separation of the two mechanisms is only necessary in the EnVion day stage to take place, which is of great benefit in terms of a uniform material flow in a production facility.

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Designation ^ list

1 inner box

2 seat plate supports

3 screws, detachable fasteners k outer box

5 pivot bolts (on which outer box k is placed on the inner box)

6 (first) bolt (on which tooth segment 7 is mounted)

7 tooth segment

8 (second) bolts in the sliding block, supports outer box H

9 sliding block

10 seat

11 locking bolts

12 pawl

13 Bearing axle for pawl

14 spacer sleeve

15 bearing bush

16 button

17 spiral spring (as dead center spring for pawl)

18 backrest (backrest)

19 tension spring (backrest recoil spring)

20 threaded rod

to adjust the spring preload

21 Thread turning knob

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22 threaded bolts

23 spacer

as a clamping device

24 spacer sleeve

25 bracing nut

26 guide tube (for the backrest rod)

27 backrest bar

28 Guide (in the F 'tube for the backrest rod)

29 clip (to secure the guide)

30 handwheel

31 bevel gear

32 TrieLling

33 threaded spindle

34 mother

35 spindle clip (spring clip)

36 clip (to hold the pinion in place)

37 socket pin (for locking the backrest rod)

38 locking clip (for locking the backrest rod)

39 middle tongue of the locking clip

40 circumferential edge of the locking clip

41 Cams of the locking clip

42 locking holes in the backrest rod 43

45 Covering of the locking clip

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6 return spring for pawl

7 Retaining spring for pawl

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Claims (1)

I (· Γ0 Γ ft »-Lit» ι ι et ·· · · ι <> 27 - Protection claims 1. Office swivel chair, with a backrest adjustable in inclination and height, the backrest being connected to the seat via an angle lever, one leg of which at its free end is rotatably mounted under the seat near its pivot point about a horizontal axis parallel to the backrest is, characterized in that on the underside of the seat plate carrier (2) a radially extending from the seat pivot point downwardly open inner box (1) is attached, at the end facing the seat pivot point facing the inner box (1) encompassing, after obt. i more open to a · -chief.? 1 of the angle lever forming outer box ('') is mounted on a pivot pin (5), and the outer box (4) at its free end a guide tube (26) forming the other leg of the angle lever for the telescopic guidance of the backrest at its free end (18) supporting backrest bar ^ s (27), and between the outer box (H) and the seat plate support (2) a tension spring (19) acting as a backrest spring is provided. Is 2. A chair according to claim 1, characterized in that in the inner box (1) rotatably mounted on a Eisten bolt (6) eil toothed segment (7) is provided over which _s 7330152 12/30/76 - 28 - a wide bolt (8) provided between the bearing at the first bolt (6) and the teeth can be removed connected to the outer box (4), and in the inner box (1) further a pawl (12) is provided, which by means of a locking bolt (Ii) into the teeth of the Zahrisegmr.nts (7) can be engaged. 3. Seating furniture according to claim 2, characterized in that the pawl (12) with spring elements (17; 46, 47) is connected and / or connectable in such a way that it is a assumes a stable position. 4. Seating furniture according to claims 2 and / or 3, characterized in that that the second bolt (8) is mounted in a sliding block (9) which, in order to compensate for the relative movements between the outer box (4) and the toothed segment (7) slides in a recess in the toothed segment (7). P- 5. Seating furniture according to claim i, characterized in that a threaded bolt (22) which passes through the inner box (1) and the outer box (4) is provided, which spacer washers (23) between the inner box (1) and the outer box (4) _s and inside the inner box (1) carries a spacer sleeve (24), and a bracing nut (25) of the 330152 12/30/76 The inner box (1) and the outer box (4) can be braced against one another in a non-positive manner. 6. Seating furniture according to one of claims 2 to 5 »characterized in that that the pawl (12) or the clamping nut (25) by means of an actuation button (16) or a toggle, star grip or the like. By hand from can be operated externally. 7. Seating furniture according to one of claims 1 to 6, characterized in that that the tension spring (19) by means of a threaded rod (20) and a threaded turning knob a (21) of is externally preloaded. 8. Seating furniture according to one of the preceding claims, characterized in that the backrest rod (27) for the purpose Adjustment of the height of the backrest (18) at its lower end has a nut (3Ό, in which a engages vertically acting threaded spindle (33) which is mounted at its other end on the bottom of the inner box (1) and there has a bevel gear acting as a pinion pinion (32), which via a second bevel gear (3D and an externally accessible handwheel (30) connected to it can be driven. 7330152 12/30/76 ι · ♦ If «
• I II * - 30 - 9. Seating furniture according to claim 8, characterized in that a spring element in the form of a clip (36) inhibiting the rotation of the threaded spindle (33) is provided. 10. Seating furniture according to claims 8 and / or 9, characterized in that the nut (34) in the backrest rod (27) is inserted by means of a spring clip (35). 11. Seating furniture according to one of claims 1 to 7, characterized in that the position of the backrest bar (27) in the guide tube (26) by means of an externally actuable locking clip (38) and locking holes (42) can be fixed in the backrest rod (27). 12. Seating furniture according to one of claims 8 to 11, characterized in that at the upper end of the guide tube (26) a guide (28) is provided between the guide tube (26) and the backrest rod (27) which promotes the low-play and smooth sliding of the backrest rod (27), which can be inserted into the guide tube by means of a spring clip (29). 13 «Seating furniture according to claim 11, characterized in that the locking clip (38) has a central tongue (39) firmly connected to the guide tube (26), the free leg of which can be snapped into the locking holes (42) 7330152 12/30/76 Bolt (37) is provided and connected to a circumferential edge (40) which has two cams (41) resting on the guide tube (26) such that when force is applied to the side of the edge (40 ) the locking clip (38) and the Ajflagpunkte the cams (41) executes a pivoting movement, the bolt (37) being disengaged from the locking holes (42) and when the force is exerted, the tongue (39) re-engages the bolt (37) by spring action presses into the locking holes (42). 14. Seating furniture according to claim 13, characterized in that that the locking clip (38) is formed in one piece from spring steel. 15. Seating furniture according to claim 14, characterized in that the bolt (37) is designed as a lug protruding in one piece from the locking clip (38). 7330152 12/30/76