EP1520494A1 - Mechanism for adjusting a sofa-bed - Google Patents

Abstract

A dual-purpose sofa/bed has a horizontal seat and an upright backrest which pivots against the seat between an upright seating position and a horizontal sleeping position. The movement is facilitated by a three-point hinge and lock mechanism with upper and lower locking positions and esp. an intermediate part-reclining 'relaxing' position.

Description

The invention relates to a device for adjusting a sofa bed according to The preamble of claim 1 or claim 2.

In addition to the well-known function of sofa beds for unfolding a lying surface There is an increasing need for support that the sofa bed next to the sitting position should also have a so-called. Relaxing position, with respect to the position of the Backrest relative to the horizontal a little flatter than the sitting position formed is. Such a relaxation position is used for relaxation and is considered additional Function realized to the known basic functions of a sofa bed.

Known fittings for sofa beds of such types have the disadvantage that the hinge mechanism between the back frame and the seat frame forming Components of the sofa bed has a relatively large height and in protrudes that portion of the sofa bed needed for the upholstery. To make room for this towering hinge mechanism is usually the upholstery is composed of two parts, one part being the bed or the lying surface forming seat frame and the other forming the backrest Backrest frame covers.

In EP 0 380 156 B1 has also been proposed that for the reduction of Height of the hinge joint and thus to a reduced overlap of the joint in the area of the upholstery in a fitting for a sofa bed the Pivot point is placed as low as possible and extra stop elements in the area articulated connection of back frame and seat frame are provided, the a secure support of the backrest frame in the sitting and in the relaxed position enable. For this purpose, a finger-like lever is provided as part of the stop, the at two different sections along its extent once in the relaxation position and once in the sitting position with a unit stop in conjunction occurs. As a result, a little upwardly projecting training of Hinge joint and also arranged there latching possible, the one Support of the seat frame and back frame form each other and the use ensure one-piece or multi-part, interconnected mattress parts. The disadvantage, however, is that the shape and the support of the finger on the Stop require a fairly complex movement mechanics and in particular the Support of the finger on the stop in the relaxed position by a shape-dependent Support of the finger on a bolt is only relatively uncertain.

From DE 198 28 224 C1 is a device for adjusting a sofa bed in a bed, a sofa and a relaxation position known, comprising a back frame or the like. Of the sofa bed associated backrest section and a Seat frame or the like. Of the sofa bed associated seat portion, backrest portion and seat portion pivotally connected to each other via a hinge and via a pawl mechanism in position at least in the sitting position and the relax position of the sofa bed are fixable to each other, and a base frame or the like. Of the sofa bed associated base part, wherein backrest section and seat portion pivotally connected to the base part via a link assembly are and in the sofa position and the relaxation position of the sofa bed over anchor devices support each other. Here is in the relaxed position of the sofa bed a first stop means is formed as a finger-like lever, the Lehnenabschnitt or seat portion is arranged and at one of the base part arranged stop supports, and the link assembly between the seat portion or backrest section and base part is formed of two handlebars, the are supported in the sitting position of the sofa bed together and a stop device form for the sitting position. This device has the disadvantage that the finger-like Lever and the stopper are each formed as additional parts and increase the size of the device not insignificant. In addition, it can at this device happen that the finger-like lever slips off the stop, when lateral loads act on the device.

Object of the present invention is therefore an apparatus for adjustment a sofa bed of the generic type such that the construction a generic device is simplified without the function itself this worsens and at the same time the safety of the device compared Improved loads is improved.

The solution of the object according to the invention results from the characterizing Features of claim 1 and claim 2 in cooperation with the Characteristics of the generic term. Further advantageous embodiments of the invention emerge from the dependent claims.

The invention relates to a generic device for adjusting a Sofabettes in a bed, a sofa and a relaxation position, comprising one a back frame of the sofa bed associated backrest section and a one Seat frame of the sofa bed associated seat portion, backrest portion and seat portion pivotally connected together via a hinge and a Ratchet mechanism in position at least in the sitting position and the Relaxation of the sofa bed are fixed to each other, and a base frame the sofa bed associated base part, wherein backrest portion and seat portion with the base part are hingedly connected via handlebar lugs and in the sofa position and the relaxation position of the sofa bed via stop devices to each other support. This generic device is further developed by a first stop means is designed as a finger-like lever which is connected to one of Handlebars is arranged and assigned when setting one of the relaxation position Swivel angle between seat section and backrest section on the Pawl of the pawl mechanism is supported, whereas the finger-like Lever and the pawl when setting one of the seating position assigned Swivel angle change their spatial assignment such that finger-like lever and pawl no longer interact with each other and the handlebar lugs thereby reach a position where they have a stop device for the To form a sitting position. As a result, the construction of the device according to the invention much easier, comes with fewer separate parts and guaranteed Nevertheless, certainly the necessary function for setting the different positions and in particular the relaxation position and the sitting position. Along with the pawl mechanism is the operation and the achievement of sitting position Relaxation by the user in a simple and targeted way possible. Due to the sequence of pivoting movements due to the actuation of the parts of the Sofabeds when folding out or folding in and setting the relaxation position or sitting position is the finger-like lever with its cooperating with the pawl End created to reach the relaxation position of the pawl and otherwise passed by this pawl. In the latter case, the pawl Inactive in this regard and instead of the relaxation position, the sitting position is set. This gives the pawl mechanism a dual function, thereby a further simplification of the device according to the invention is achieved. The device thus combines a high operating safety with great ease of use, without the advantages of the generic fittings in terms of affect one-piece or multi-part related padding.

It goes without saying that the device according to the invention both on sofa beds as well as sitting and lying furniture or the like with similar requirements the kinematics of the sitting and lying furniture or similar user requirements can be applied. Is therefore in the present invention of a sofa bed spoken, this always refers to sofa beds in use or kinematics similar seating and reclining furniture of any kind, the terms Lehnenrahmen, Seat frame and base frame are to be understood functionally and depending on Design of the sofa bed constructively different can be designed.

The invention further describes another arrangement of finger-like lever and pawl, wherein the finger-like lever disposed on the pawl itself is and is supported on a arranged on one of the handlebar lugs stop. This is virtually the kinematic reversal of the arrangement described above and also has all the advantages and properties mentioned.

It is advantageous if the finger-like lever with its assigning the stop End so from the pivot plane between seat portion and backrest section Angled out and arranged that he pivots in one of the Relaxstellung associated pivoting angle between the seat portion and backrest section the pawl touched at least in sections, whereas he during pivoting in one of the sitting position associated pivot angle between the seat portion and Lehnenabschnitt passed by the pawl without touching. hereby can automatically and without further operation of the device by the user the sofa bed to ensure that a corresponding position the sofa bed alone can be achieved by changing the seat section. Also There is no additional movement or additional mechanisms for this be provided on the device.

Furthermore, it can be provided that the finger-like lever at least with his the pawl associated portion so from the pivot plane between Seat section and backrest section is cranked out that he is using this section laterally displaced seat section or backrest section can overlap and in the relaxed position engageable with the pawl. As a result, the inventive Construct device particularly space-saving.

The assignment of the finger-like lever to the pawl can thereby improve when the finger-like lever is bent in the direction of the pawl is. As a result, the pivoting of the lever relative to the pawl easier, since the bend of the lever corresponding to the path of the finger-like Levers can be aligned relative to the pawl. This can be a short and achieve structurally optimized arrangement of the finger-like lever. This results in a further with respect to the burden of the finger-like lever particularly favorable contact between the finger-like lever and the pawl.

In a first embodiment, the finger-like lever from one of the handlebar strap or cut out of seat section / backrest section and vertically from the pivot plane between seat portion and backrest section exposed Be formed tab. This makes it easy to manufacture the required Contact points to the finger-like lever even without required installation steps and thus achieve cost-effective. Of course it is in another embodiment also possible that the finger-like lever from a separate and vertical from the pivot plane between the handlebar strap or seat section / backrest section hervororkragend arranged tab is formed. This is then a separate Installation of the finger-like lever necessary. Furthermore, it is conceivable that the Stop at least with its stop surface approximately perpendicular from the pivot plane between the seat portion and the backrest section protrudes, with a hervororkragend to be able to interact with a trained finger-like lever.

In a further embodiment, the pawl can be designed such that they in the relaxed position with at least one section in the trajectory of the finger-like lever comes to rest, whereas the pawl in the sitting position completely outside the trajectory of the finger-like lever to lie comes. By the anyway in the adjustment of the device in the various Positions accompanying change in the spatial position of the pawl can simply the assignment of finger-like lever and pawl in the different Positions realized and thus the fixation of the relaxed position and sitting position be guaranteed. For this purpose, in a further embodiment of the pawl mechanism a gate-like opening into which the finger-like lever in sitting position without contact with the pawl. dips. This hinders the Pawl mechanism the movement of the finger-like lever in the sitting position not and it can be the seating position associated with swivel angle between Adjust backrest section and seat section. In addition, it is ensured that also at lateral loads of the device slipping of the finger-like lever is reliably prevented by the pawl.

To help the operator unfold the sofa bed, it helps to when the first link plate biased by a tension spring so against the base part is that the association of backrest section and seat section against the spring force must be swung out of the extended lying position. hereby the folding is supported spring-actuated in a basically known manner.

A particularly preferred embodiment of the device according to the invention to adjust a sofa bed shows the drawing.

Figur 1a-1b -

die Sitzstellung der erfindungsgemäßen Vorrichtung zur Verstellung eines Sofabettes mit Anschlag der ersten Lenkerlasche an der Ausnehmung der zweiten Lenkerlasche bei in den Sperrklinkenmechanismus eingetauchten fingerartigen Hebel in der Seitenansicht und in der Rückansicht,

Figur 2a-2b -

die Relaxstellung der erfindungsgemäßen Vorrichtung gemäß Figur 1 a, 1b mit Anschlag des fingerartigen Hebels an dem Sperrklinkenmechanismus in der Seitenansicht und in der Rückansicht,

Figur 3 -

Liegestellung der erfindungsgemäßen Vorrichtung gemäß Figur 1 a, 1b mit angedeutetem Untergestell sowie ausgeklappter Polsterung durch Lehnenrahmen und Sitzrahmen,

Figur 4a-4d -

Stadienplan einer Verstellung der erfindungsgemäßen Vorrichtung von der Relaxstellung in die Sitzstellung mit unterschiedlicher Zuordnung von fingerartigem Hebel und Sperrklinkenmechanismus.

Show it:

FIGS. 1a-1b

the sitting position of the device according to the invention for adjusting a sofa bed with stop of the first link plate on the recess of the second link plate in the pawl mechanism immersed finger-like lever in the side view and in the rear view,

FIGS. 2a-2b

the relaxation position of the device according to the invention according to FIG. 1a, 1b with stop of the finger-like lever on the pawl mechanism in the side view and in the rear view,

FIG. 3 -

Lying position of the device according to the invention according to FIG. 1 a, 1 b with an indicated underframe as well as unfolded upholstery by backrest frame and seat frame,

FIGS. 4a-4d

Stadiumsplan an adjustment of the device of the invention from the relaxed position in the sitting position with different assignment of finger-like lever and pawl mechanism.

In the figures 1a, 1b and 2a, 2b, the device according to the invention is once in the Sitting position (Figure 1a, 1b) and once in the relaxed position (Figure 2a, 2b) shown, the structure of the device according to the invention essentially based on the Figures 1a and 1b to be shown. The relaxation position then differs essentially only with respect to the stop actuation, with these figures in the essentially these differences are explained. The description of Figures 1a and 1b applies mutatis mutandis. The functional parts of the sofa bed like upholstery 20, 21 and frame 23 are shown in FIGS. 1a, 1b and 2a for reasons of greater clarity. 2b omitted. Also, only one side of the known manner on both sides of a sofa bed arranged devices for adjustment, the total for Swinging a sofa bed are needed. The device on the other Side of the sofa bed is basically the same, but mirror-image design providable on the sofa bed. In the figures, moreover, are the parts of the device shown mainly in their outline edges, the occlusion of Parts not taken into account by other parts in front of each other is.

Figures 1 a and 1b show a first position of the device according to the invention for adjusting a sofa bed in the sitting position with stop the first Handlebar lug 4 on the recess 8 of the second handlebar lug 5. The device is formed here from a seat portion 1, with the aid of the support bracket 17th Padding parts 21 not shown here, the seat or the upholstery of Seat carrying frame accommodates. Furthermore, a with the seat portion. 1 To recognize about the hinge 6 articulated backrest section 2, the also with the help of a support bracket 18 which also not shown here Frame parts of the backrest or the backrest padding 20 carries. Below the in Figure 1 illustrated Lehnenabschnittes 2 and the seat portion 1 is the here also not shown frame 23 of the sofa bed attachable base part 3 to recognize that with not explained in more detail fastening devices, for example Screws or the like., Are attached to the base 23 of the sofa bed can.

Between the base part 3 and the backrest section 2 are each with swivel joints 13 provided at its two ends to the base part 3 and backrest section 2 handlebar lugs 4 and 5 arranged, the pivotal movement of the backrest portion. 2 enable and guide relative to the base part 3. By this pivoting movement is also the seat portion 1, which in turn via the hinge point 6 with the backrest section 2 is connected, swung. Seat section 1, backrest section 2, Handlebars 4, 5 and base part 3 form a specialist in its basic Construction basically known kinematic pivoting device for unfolding of sofa beds, so that here mainly the peculiarities of the design of the Device to be placed in the foreground according to the invention.

The handlebars 4, 5 lead the backrest section 2 due to their different Linkages along a defined path, wherein the end position of the unfolded Condition of the seat cushion 21 and backrest cushion 20 at least partially formed lying surface shown in Figure 3 and described in more detail there is.

Near the other end position of the possible pivoting of the backrest section 2 the device according to the invention is now two to a relatively small Swivel angle to take different positions, one of which position a relatively steep employment of the backrest section 2 and thus ultimately the backrest cushion 20 causes. This sitting position is shown in the figure 1, wherein the corresponding end position by applying the first link bar 4 to a Recess 8 of the second link plate 5 determined in a manner described in more detail becomes.

The handlebar lugs 4, 5 are in this case designed as substantially flat sheet metal parts, However, due to the requirement of a pivoting and its articulation To base part 3 and backrest section 2 are cranked at least on one side to a free unobstructed tilting at least over the relevant pivoting range relative to the base part 3 and backrest section 2 to allow. The hinge points 13 are here in a generally known manner by not shown Bolzenoder Rivet connections executable, any other suitable in the fitting technique equivalent connection technology can also be used.

In the illustrated in Figure 1 end position of the pivoting of the second link plate. 5 this extends almost parallel to the support bracket 18 of the backrest section 2. In the same position, the first handlebar lug 4 forms relative to the second handlebar lug 5 an acute angle, as they correspond by their lower pivot point 13 is articulated. Another pivoting of the handlebars 4, 5 in a flatter Position of the backrest section 2 is by striking the rounded End 19 of the first link bar 4 reaches a recess 8, which in the first handlebar edge 4 facing edge of the second link plate 5 is formed is. As a result, the two handlebars 4, 5 are based on each other in the sitting position off and prevent safe and with a suitably shaped support surface between them a further pivoting of the backrest section 2. It goes without saying by itself, that depending on the desired positions, assigned angles and present Dimensions of the parts a striking of the first handlebar 4 not necessarily must take place in the illustrated recess 8, but also directly to a straight line portion of the second link plate 5 or even on a protruding Section of the second link plate 5 can be done. It is important here especially that by the approximately parallel arrangement of the two link plates 4, 5 and their substantially extended position relative to the backrest section 2 a secure End position for sitting position is achieved.

The recess 8 shown in Figure 1 is in this case approximately ramp-shaped to the formed upper end of the second link bar 5 deepening and points in approximately matching the rounding of the associated end 19 of the first link plate 4 also a rounding up. By appropriate choice of the ramp angle and the Depth of the recess 8, the attachment point for the sitting position can be influenced. The recess 8 itself can be easily in the production of the second handlebar lug 5, which can be preferably produced as a sheet metal part, punched with the same and therefore causes only low costs in the production.

The seat portion 1 in turn is on the one hand via the common pivot point. 6 connected to the backrest section 2, on the other hand, its position relative to Backrest section 2 via a generally designated 10 pawl mechanism determined, the pawl 24 on the seat portion 1 via a bolt 14 is articulated and in a basically known manner with a total of two Interlocking cooperates, which formed the backrest section 2 or on the backrest section 2 are arranged. The pawl mechanism 10 has a Rest position for the sitting position and a rest position for the relaxation position of the sofa bed and is against the force of a spring 16 in also basically known Sent by the pivoting of the parts of the sofa bed. hereby is in each of the two positions according to Figure 1 and 2, a defined assignment guaranteed by backrest section 2 and seat section 1, with the selected dimensions the pivoting angle of backrest section 2 and seat section 1 adaptable do.

The first link plate 4 is to improve the operation when re-folding of the sofa bed supported by the force of a tension spring 11, which is the first Handlebar lug 4 moves to the right in Figure 1 a and thus simplifies the provision.

FIGS. 2a and 2b now show a second position of the device according to the invention for adjusting a sofa bed in the relaxed position with stop of a finger-like lever 9 on the pawl 24. The from the sitting position 1 only by a small swing angle different relaxing position, in the substantially the Lehnenabschnitt 2 is set flatter, now requires another Stop, which together with the pawl mechanism 10, which also the other detent occupies the pivotal position of backrest section 2 and seat section 1 determines. For this purpose, the finger-like device according to the invention Lever 9 is arranged, which defines the relax position with the pawl 24. The finger-like Lever 9 is designed as a slightly curved trained lever, which is attached to the handlebar lever 5. and is pivoted with this. The finger-like Lever 9 is still designed as a sheet metal part, wherein the pawl 24 facing end of the finger-like lever 9 so relative to the pivoting plane the device is cranked that he the handlebar lever 4 and the seat portion. 1 can overlap and thus not with the seat portion 1 at a pivoting collided. Furthermore, the pawl 24 facing the end of the finger-like Lever 9 is designed so that it is on to achieve the sitting position of the Sofabettes zurückzulegenden way without touching the pawl 24 in the attack area 15 is passed and only when pivoting in the relaxed position this pawl 24 touches.

The pawl mechanism 10 can be formed for this purpose, for example, that a bracket 7 between the joint 6 and joint 14, the area of the pawl mechanism 10 bow-like overhanging and thereby a gate-like opening between Pawl 24 and joint 6 limited upper side, in which the finger-like lever 9 in the relaxation position can dip without the pawl 24 or the joint 6 to touch. This position of the device shown in Figure 1 a therefore allows the Achievement of the sitting position, in the manner already described above the Handlebars form the stop for the seat portion and the backrest portion.

In the relaxed position shown in Figure 2a, however, is by the other position the pawl mechanism 10, so the assignment of the pawl 24 to the Rest ensured that the finger-like lever 9 is not in the through the bracket 7, the joint 6 and the pawl 24 formed opening may occur, but to the pawl 24 abuts in the stop area 15 and thus the movement of the finger-like lever 9 is limited in achieving the relaxation position. hereby the angular position between backrest section 2 and seat section 1 is fixed and also towards e.g. Particularly well secured lateral loads. It goes without saying also conceivable that another portion of the components in the joint area between backrest portion 2 and seat portion 1 a stopper area 15 for the finger-like lever 9 and thus can form a boundary for the relaxation position. Of course, here again by appropriate change in the dimensions and arrangements of the involved stop partners finger-like lever. 9 and pawl 24 changes in the relaxed position can be achieved.

Furthermore, it is also conceivable that in another embodiment, a kinematic Reversal between finger-like lever 9 and pawl 24 can take place. For this purpose, it would be conceivable if the finger-like lever 9 is arranged on the pawl 24 is and the stop is located on one of the two handlebar links 4, 5.

FIG. 3 shows a third position of the adjustment device according to the invention a sofa bed in the lying position with indicated base 23 as well Upholstery on back frame 20 and seat frame 21. This lying position is related interesting only marginally with the present invention. Also is indicated, as shown only in the outbreak base 23 of the sofa bed can be arranged relative to the base part 3. Otherwise these arrangements are generally known for generic sofa beds, should only at this point be pointed out. It should also be noted that by the Use of a device according to the invention a one-piece or on the item number 22 multi-part contiguous padding on the sofa bed use Can be found.

In the figures 4a to 4d, the process of conversion of the invention Device in the relaxed position (Figure 4a shortly before reaching the stop and Figure 4b with voltage applied to the pawl 24 finger-like lever 9) and in the sitting position (Figure 4c shortly before immersion of the finger-like lever 9 in the toroidal Opening between the pawl 24, bracket 7, joint 6 and joint 14 and Figure 4c with the immersed in the gate-like opening finger-like lever 9 shortly before reaching sitting position). The assignment of the individual components to each other and the the resulting function of the device are described in detail above, so that reference may be made to this point.

Part number list

1 -

seat section

2 -

back portion

3 -

base

4 -

first handlebar strap

5 -

second handlebar strap

6 -

joint

7 -

hanger

8th -

recess

9 -

finger-like lever

10 -

Ratchet mechanism

11 -

feather

13 -

swivel

14 -

bolt

15 -

Stop area finger-like lever

16 -

Spring pawl mechanism

17 -

Support angle seat frame

18 -

Support angle backrest frame

19 -

rounded end first handlebar strap

20 -

backrest upholstery

21 -

seat upholstery

22 -

Connection backrest upholstery and seat upholstery

23 -

undercarriage

24 -

pawl

Claims (12)

Device for adjusting a sofa bed into a bed, a sofa and a relaxation position, comprising
a backrest section (2) associated with a backrest frame (20) of the sofa bed and a seat section (1) associated with a seat frame (21) of the sofa bed, wherein backrest section (2) and seat section (1) are pivotally connected to one another via a hinge (6) and via a Locking pawl mechanism (10) in position at least in the sitting position and the relaxed position of the sofa bed are fixed to each other, and
a base part (3) associated with a base frame (23) of the sofa bed, wherein backrest section (2) and seat section (1) are articulated to the base part (3) via handlebar lugs (4, 5) and in the sofa position and the relaxed position of the sofa bed abut against one another via stop devices (8, 13, 24, 9),
characterized in that
a first stop device is designed as a finger-like lever (9) which is arranged on one of the handlebar lugs (4, 5) and adjusts itself to the pawl (24) when a pivoting angle between the seat section (1) and the backrest section (2) is set. the pawl mechanism (10) is supported, whereas the finger-like lever (9) and the pawl (24) change their spatial assignment such that the finger-like lever (9) and pawl (24) no longer interact with each other and setting the one associated with sitting position swivel angle Handlebars (4, 5) can thereby reach a position in which they form a stop device (8, 13) for sitting position. Device for adjusting a sofa bed into a bed, a sofa and a relaxation position, comprising
a backrest section (2) associated with a backrest frame (20) of the sofa bed and a seat section (1) associated with a seat frame (21) of the sofa bed, wherein backrest section (2) and seat section (1) are pivotally connected to one another via a hinge (6) and via a Locking pawl mechanism (10) in position at least in the sitting position and the relaxed position of the sofa bed are fixed to each other, and
a base part (3) associated with a base frame (23) of the sofa bed, wherein backrest section (2) and seat section (1) are articulated to the base part (3) via handlebar lugs (4, 5) and in the sofa position and the relaxed position of the sofa bed abut against one another via stop devices (8, 13, 24, 9),
characterized in that
a first stop means is formed as a finger-like lever (9) which is arranged on the pawl (24) of the pawl mechanism (10) and upon adjustment of a relaxation position associated pivot angle between the seat portion (1) and backrest portion (2) on one at a the handlebar lugs (4, 5) arranged pawl (24) supported, whereas the finger-like lever (9) and the pawl (24) change their spatial assignment such that finger-like lever (9) and pawl (24 ) no longer interact with each other and the handlebars (4, 5) can thereby reach a position in which they form a stop device (8, 13) for sitting position. Device according to claim 1, characterized in that the finger-like lever (9) with its end facing the pawl (24) is angled out of the pivoting plane between the seat section (1) and the backrest section (2) and arranged so that it pivots into one the puck (24) touches the pawl (24) at least in sections (15), whereas when pivoting in a seat position associated pivot angle between the seat portion (1) and backrest portion (2) on the pawl ( 24) passed by without touching. Device according to one of claims 1 or 3, characterized in that the finger-like lever (9) at least with its the pawl (24) associated portion is so out of the pivot plane between the seat portion (1) and backrest portion (2) out, that he with this section laterally offset seat portion (1) or backrest portion (2) can overlap and in the relaxed position with the pawl (24) is engageable. Device according to one of claims 1, 3 or 4, characterized in that the finger-like lever (9) in the direction of the pawl (24) is formed bent. Device according to one of the preceding claims, characterized in that the finger-like lever (9) is cut out of one of the handlebar lug (4, 5) or seat portion (1) or backrest portion (2) and perpendicular from the pivoting plane between the seat portion (1) and Back section (2) exposed tab is formed. Device according to one of claims 1 to 5, characterized in that the finger-like lever (9) from a separate and perpendicular from the pivot plane between the seat portion (1) and backrest portion (2) hervororkragend arranged tab is formed. Device according to one of the preceding claims, characterized in that the pawl (24) protrudes at least with its stop surface approximately perpendicularly from the pivot plane between the seat portion (1) and the backrest portion (2). Device according to one of the preceding claims, characterized in that the pawl (24) is designed so that it comes to lie in the relaxed position with at least one section in the path of movement of the finger-like lever (9), whereas the pawl (24) in the Sitting position completely outside the trajectory of the finger-like lever (9) comes to rest. Device according to Claim 9, characterized in that a gate-like opening is formed in the region of the pawl mechanism (10), into which the finger-like lever (9) in the sitting position without contact with the pawl (24) or adjacently arranged components (6, 24 immersed). Device according to one of the preceding claims, characterized in that in the sitting position, the base (3) facing away from the end (19) of the first link plate (4) engages in a recess provided in the second handlebar recess (8) and on the second link plate ( 5) is supported. Device according to one of the preceding claims, characterized in that the first link plate (4) via a tension spring (11) is biased against the base part (3), that the association of backrest portion (2) and seat portion (1) against the spring force the extended lying position must be swung out.

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