DE102008045936B3 - Couch mounting device for temporary function changing and remodeling office chair into lounger, has web mat upwardly extending along backrest above short frame rear tube upto upper edge of backrest in curve shape in use position - Google Patents

Abstract

The device (6) has frames (7) arranged on a seat surface (2) of an office chair (1) between an arm rest (5) and another arm rest in a use position. A rectangular web mat (20) is arranged in an intermediate space of the frames on an end. A front edge of the mat is fastened to a short frame front tube. Side edges of the mat are fastened to the frames. The web mat upwardly extends along a backrest (3) above a short frame rear tube upto an upper edge (29) of the backrest in a curve shape on another end in the use position. The web mat is detachably fastened to the upper edge.

Description

The The invention relates to a cropping device for a office chairs with a seat, a backrest and two side-mounted armrests.

conventional office chairs are exclusive intended for sitting and suitable. Lasting for hours, in the same posture practiced sedentary activity to perform the usual Work is physically and psychologically extremely stressful. Therefore, it is common among sufferers the need, about to lift your legs and relax at lunchtime, to loosen up the strained back muscles in a lying position and the lunch fatigue to overcome by taking a nap. That's in today's offices usually not possible. Some offices could indeed with usual Relaxed, but such "luxury" is in the trimmed for effectiveness Office world frowned upon. Everyone Progressive thinking psychologist recognizes the merits of one short rest period during the lunch break and propagates this as for the afternoon work performance-enhancing. Nevertheless, an office nap is against better knowledge than improper. So you drags yourself without midday rest opportunities often tired and tired through the second half the daily Office work.

A device for uplifting the legs is for example in the US 005449221 A described. This is a device that is positioned on the seat of chairs, benches, sofas and the like. Their unfolded mechanism allows for increased laying position of the legs. This uplifting of the legs thus provides relief against possible back, - leg, - body aches and thus achieves a well-being effect. Disadvantage of the invention is that only the legs can be brought into an oblique, horizontal-like position. The upper body must hereby remain in a, correspond to the backrest of his furniture predetermined almost vertical seating position.

Another way of making a chair, - transformed into a reclining piece of furniture, is in the DE 10 2004 047 619 A1 described. This is a chair, with integrated swivel mechanism, by pivoting the seat, - and back surface is transformed into a bed surface and thus creates a rest position. Disadvantage of the invention is that mechanics of this kind are found only in expensive living room furniture. The subsequent conversion of a conventional office chair into a lounger is not feasible with this approach.

It is therefore an object of the invention, a simple, from a few parts existing auxiliary device to create, with which a commercial office chair converted in a few steps to a relaxation bed and as well simply transformed back can be, after which the auxiliary device saves space when not in use to be stowed.

These Task is according to the invention solved by a cropping device for an office chair of the aforementioned Way of temporarily converting the office chair into a recliner, consisting of a substantially rectangular frame with two laterally extending frame longitudinal tubes, a short frame front pipe and a short frame rear pipe, wherein the frame in the use position partially over the seat of the office chair arranged between the two armrests and by means of a holding or clamping device one-end is detachably fastened to the two armrests, and wherein the frame otherwise on a mounted on it, in the use position approximately vertically on the floor surface upstanding support strut is mounted such that the frame main plane in the use position runs approximately horizontally, and from an elongated, in principle approximately rectangular tissue mat, the one-end arranged in the space of the frame and fastened there is, with its front edge on the front short frame front tube and their two side edges are each secured to the frame, and in the position of use, the other end located about above the seat short frame rear tube of the frame out along the backrest arc-shaped up to its upper edge extends upward and at the upper edge solvable is fastened.

Further Details of the subject invention will become apparent from the features the dependent claims.

through Simple handles can be a normal office chair by the device according to the invention in to be transformed into a relaxation lounger. Of course this is by no means a comfort bed of mattress quality. But she still fulfills the requirements placed on her: she offers her user the Possibility, to put your feet up during work breaks, The back to relax and keep your eyes open to take a restful nap.

Adaptation the device according to the invention to any shape and size commercially available Office chairs as well Construction and dismantling of the same are themselves from technically untalented Layman to cope easily.

More details, features and benefits of the subject invention will become apparent from the following description of a preferred embodiment of the invention and from the attached in the annex drawing. Show it:

1 a side view of a commercial office chair with a preferred embodiment of a growing device according to the invention in the position of use for temporary remodeling of the office chair as a recliner, consisting of a covered with a fabric mat frame which is releasably attached to the office chair, the other end is mounted on a standing on the floor support strut ;

2 a plan view of the office chair according to 1 with the attached thereto, covered with the fabric mat frame;

3 a plan view of the unwound in a plane fabric mat whose front (foot-side) half is fixed to the edge of the frame edge;

4 a detail E1 of the plan view of the fabric mat according to 3 (in magnification);

5 a detail E2 of the plan view of the fabric mat according to 3 (in magnification);

6 a side view of a clamping device for the frame on a (on the right) armrest of the office chair;

7 a sectional view through the clamping device along the section line VII-VII in 6 with a right armrest cross-shaped, C-shaped molded part and a pressing in the use position against the armrest and the frame pressing part (each of sheet metal, made of dimensionally stable plastic od. Like.);

8th a the 6 and 7 corresponding perspective, partially cut front view of the right clamping device according to 6 ;

9 an exploded view showing the individual parts of the holding or clamping device of the crop-growing device according to the invention;

10 a sectional view through an eccentric lever of the clamping device along the section line XX in 6 or XX in 7 for releasably securing the frame to the clamping device;

11 a longitudinal section through a two-part frame longitudinal tube along the longitudinal axis R of the frame longitudinal tube parallel to the cutting line XI-XI in 3 with representation of the divisibility of the frame longitudinal tube for the separation of the frame after its disassembly for the purpose of space-saving storage of the crop-growing device according to the invention in its rest position;

12 one of the 11 corresponding, about the longitudinal axis R of the frame longitudinal tube rotated by 90 °, partly broken-away outer view of the 2-divided frame longitudinal tube, with a latching mechanism, and

13 a non-scale, schematic representation of one of 3 deviating further embodiment of the frame 7 according to the invention with on both sides 3-divided frame longitudinal tubes.

According to 1 has a commercial office chair 1 a seat 2 , a backrest 3 and two armrests 4 . 5 on. A cropping device according to the invention 6 has a frame according to a preferred embodiment 7 with two laterally extending frame longitudinal tubes 8th . 9 and a short frame front pipe 10 and a short frame rear pipe 11 on. The width B or the length of the Rahmenvorder- or frame rear tubes 10 . 11 of the frame 7 is smaller than the clear distance A between the two armrests 4 . 5 of the office chair 1 , Thus, the frame 7 between the two armrests 4 . 5 be led. On the left and right frame tube 8th . 9 of the frame 7 of length L is near the frame rear pipe 11 On the outside, in each case, a load-bearing, hook-like shaped frame holder 12 . 13 firmly attached, preferably welded. The two frame holders 12 . 13 run at a distance from the frame's longitudinal tubes 8th . 9 parallel to these. The frame holder 12 . 13 serve the frame 7 in its position of use on a holding device described below 14 . 15 the attached growing device according to the invention 6 store as described below.

Anderendig is at the frame 7 a pivotable about an axis S support strut 16 appropriate ( 1 and 4 ), whose lower position in use position 17 on a floor surface 18 gets up. The length of the support strut 16 is sized to fit the frame 7 holds in its position of use in a practically horizontal position, such as 1 shows. The support strut 16 can in rest position of the cropping device 6 to the frame 7 to save space. At the request of the user, the inclination of the lying surface of the crop-growing device ( 6 ) in the position of use by raising or lowering the seat and the armrests ( 4 . 5 ) changeable.

As 2 shows is the frame 7 the cropping device 6 over its entire length L with an elongated fabric mat or Liegemat th 20 covered. Near the front end 19 the fabric mat 20 this one has a number of eyelets 21 for holding a tether 22 on. With the help of the tether 22 is the fabric mat 20 on a number of wire loops 70 attached to a zigzag-like bent retaining wire, the front frame tube at the front 10 welded spotwise.

As 2 shows, the tissue mat 20 in its front area (approximately in the foot area of the couch) along its two side edges 23 . 24 each a number of eyelets 26 for holding tethers 28 on. With the help of the tethers 28 is the fabric mat 20 on a number of wire loops 71 attached to a zig-zag-like bent retaining wire, the rear frame longitudinal tube 8th . 9 welded spotwise.

As 2 shows, the tissue mat 20 lin her rear area (approximately in the buttocks area of the lounger) along its two side edges 23 . 24 each a number of eyelets 25 for holding tethers 27 on. With the help of the tethers 27 is the fabric mat 20 on mat retaining rings 65 Tailed, on the two frame longitudinal tubes 8th . 9 threaded and within certain limits along the frame longitudinal tubes 8th . 9 are arranged displaceably.

This is the fabric mat 20 under tight tension in the frame 7 supported and thus forms the horizontal region of the lying surface of the cultivation traction device according to the invention 6 ,

The over the frame rear pipe 11 also extended to the rear end of the head 34 the elongated fabric mat 20 runs in the use position along the backrest 3 up to its upper edge 29 up. There is the fabric mat 20 around the top edge 29 the backrest 3 about 30 to 40 inches long piece led around.

The fabric mat 20 points in the area of the upper edge 29 the backrest 3 along its two side edges 23 . 24 each a number of eyelets 30 . 31 for holding tethers 32 . 33 on. With their help, the side edges 23 . 24 the fabric mat 20 connected with each other. This is the back end of the fabric mat 20 and this even on the top edge 29 the backrest 3 of the office chair 1 in her in 1 secured use position shown.

According to a preferred embodiment of the invention, the holding device 14 . 15 designed as a detachable clamping device. Because the two clamping devices 14 . 15 are virtually identical to each other, but each mirrored to each other, their items and functionality will be below only on the right in the use position clamping device 15 described.

According to the 8th and 9 has the clamping device 15 each a C-shaped bent molding 35 on, which in use position upper C-end 53 over the adjacent armrest 5 hanged. In the lower C-shaped end 54 is the right frame tube 9 arranged right frame holder 13 stored. This would be at only static load of the frame 7 already a safe storage of the frame 7 guaranteed.

As the cropping device 6 In use, however, not only is loaded statically, but when climbing the same or when descending it is exposed to dynamic forces, it must be on the armrest 5 of the office chair 1 be firmly anchored so as to ensure accident-free use at all times. Otherwise, the user is threatened by the cropping device 6 fall down and possibly injure yourself. This happens when, for example, the frame 7 provided frame boom 9 from the lower trough-shaped end 54 of the C-shaped molded part 35 slips out and falls down. The same could happen if, for example, the upper C-end 53 of the molding 35 from the armrest 5 should solve.

So care must be taken that the molding 35 on the armrest 5 of the office chair 1 solidly attached. This is done by one between the armrest 5 and the molding 35 arranged pressing part 40 , To fix the position or position stabilization means of the following items a rigid connection between the supporting molding 35 and the armrest 5 accomplished. The molding 35 and the pressed part 40 are each made of sheet metal or of dimensionally stable, bending and impact-resistant plastic od. Like. Made.

According to 9 is in the molding 35 a recess formed on the upper and lower walls 42 . 43 perforations 44 . 45 are provided. These take the axle ends 46 . 47 a wave 48 on, at the one about 120 ° swiveling eccentric lever 38 with an (eccentric) effective surface 51 is hinged, like the 8th and 10 demonstrate.

According to the 8th and 9 is the pressed part 40 to his stiffening provided with bead-like deformations. In a "trough" is a threaded hole 41 educated. In use position is in the threaded hole 41 a more or less screw down grub screw 50 arranged.

In the use position of the cropping device 6 lies the upper end 55 of the pressed part 40 the clamping device 15 directly on the inside of the armrest 5 on, like that 8th and 10 demonstrate. At the same time, the lower end is concave or arcuate in cross-section 56 of the pressed part 40 on the inside of the frame boom 13 of the frame 7 on, in the C-shaped lower end 54 of the molding 35 is stored.

The safe state of use of the cropping device 6 is by means of the eccentric lever initially pivoted out when they are mounted 38 (please refer 8th - in 10 dashed lines shown) brought about. If the latter is pivoted in the position of use ( 10 drawn in solid line), press the two ends 55 . 56 of the pressed part 40 from the inside against the armrest 5 and against the frame holder 13 of the frame 7 , The edge portions of the downwardly bent upper end 53 and the trough-shaped lower end 54 the cross-sectionally C-shaped molding 35 form the abutments. In doing so, clamp the molding 35 and the pressed part 40 the clamping device 15 above the armrest 5 and below the frame holder 13 between so tightly that a safe use of the cropping device according to the invention 6 is guaranteed.

The head area 52 in the pressed part 40 rotatably mounted grub screw 50 serves as an attack surface for the effective area 51 of the eccentric lever 38 , To any structural deviations of the width of the armrest 5 To compensate for the standard width or to effect a more or less strong clamping, the grub screw 50 in adjustment XY more or less deep into the threaded hole 41 of the pressed part 40 be screwed in ( 10 ).

At the top two corners of the molding 35 are two (at each corner one) with an internal thread 57 . 58 provided openings provided. These are each a fixing screw 59 . 60 screwed. These serve to fix the holding or clamping device 15 on the armrest 5 ,

The intended attachment of the attached growing device according to the invention 6 is accomplished by simple manipulations as follows.

First, the holding or clamping devices 14 . 15 as a result of both sides deployed eccentric lever 38 Loosely on the two armrests 4 and 5 appropriate - a situation, such as in 8th shown. Here are the moldings 35 and pressed parts 40 the two multi-part clamping devices 14 . 15 arranged loosely to each other. This allows the two on the two frame longitudinal tubes 8th . 9 arranged, hook-like frame holder 12 . 13 between the moldings 35 and pressed parts 40 in assembly direction D loosely or casually inserted, as in 8th shown. Then both sides of the office chair 1 the eccentric lever 38 folded forward, causing the moldings 35 and pressed parts 40 together the clamping of the two frame holders 12 . 13 effect as described above.

When disassembling the cropping device 6 the procedure is reversed: opening or folding away the two eccentric levers 38 to the rear, creating molded parts 35 and pressed parts 40 the clamping of the frame holder 12 . 13 to solve. The latter can then in dismounting direction E ( 8th ) from the moldings 35 and pressed parts 40 be formed, pulled out about cylindrical cavity. The cropping device 6 can now - as described above - be stowed until their next use.

Until then, the two clamping devices 14 . 15 optional on the two armrests 4 . 5 remain, with the armrests 4 . 5 cross-shaped moldings 35 with the help of fixing screws 59 . 60 on the armrests 4 . 5 can be fixed. If the cropping device according to the invention 6 when not in use (for example, in a compartment below the worktop of an office desk) to be stowed, it can be reduced to save space in space about half of its length in the operating position. This is done by telescoping together two previously mutually locked sub-tubes 79 . 69 the frame longitudinal tubes 8th . 9 of the frame 7 ,

As the 11 and 12 show is every frame length tube 8th . 9 divided according to a first embodiment of the invention approximately centrally, wherein the diameter of the respective front tube part 68 . 69 of the frame longitudinal tube 8th . 9 is dimensioned a little larger than the diameter of each rear tube part 78 . 79 of the frame longitudinal tube 8th . 9 , Thus, it is ensured that the respective rear tube part 78 . 79 with little play, but still smooth in the front tube part 68 . 69 can be inserted. Near the front end of each rear tube part 78 . 79 the latter each has a snap or latch 61 . 62 on. Near the rear end of each front pipe part 68 . 69 the latter each has a corresponding detent hole 63 . 64 on, in which the catch 61 . 62 in the position of use is resiliently latched, such as 11 shows. The catch 61 . 62 is oriented so that the effected by them locking the two pipe parts 68 . 69 / 78 . 79 the frame 7 fixed so that the latter the clamped fabric mat 20 curious holds.

For the decomposition of the two pipe parts of the frame longitudinal tubes 8th . 9 become the resilient locking lugs 61 . 62 depressed against slight spring force in the direction of arrow Z, so that now the two pipe parts 68 . 69 / 78 . 79 can be easily pushed together.

It is within the scope of the invention, the laterally extending frame longitudinal tubes 8th . 9 not only two-part, but three-part (possibly 4-part) form, as the non-scale, schematic representation in 13 shows. Thus, the above-mentioned object of a space-saving consolidation of the crop-cultivation device according to the invention 6 optimally fulfilled: the frame 7 can in disassembled state by telescopically pushing together two, three or four) individual parts of its frame longitudinal tubes 8th . 9 be shortened to the smallest possible extent. At best, the reduced total length in the longitudinal direction of the frame 7 in its rest position only about 40 to 50% of the total length L of the frame 7 in its position of use. Due to the length-reducible frame 7 The storage, packaging and shipping costs of the manufacturer and / or mail order company are minimized. The user allows the collapsed frame 7 when not in use, a space-saving storage of crop cultivation device 6 ,

By depressing the latch 61 . 62 This dissolves from the detent hole 63 . 64 , This pulls the tensioned fabric mat 20 so on the frame front tube 10 in that thereby the rear tube parts 78 . 79 in the front pipe parts 68 . 69 the frame longitudinal tubes 8th . 9 be pushed into it. It relaxes in the frame 7 clamped fabric mat 20 increasingly. The pipe parts 68 . 69 / 78 . 79 the frame length straws 8th . 9 of the frame 7 can now be practically pushed together to the end stop. The mat retaining rings can 65 . 66 (taking along the fabric mat 20 ) over the rear area of the rear pipe parts 78 . 79 the frame longitudinal tubes 8th . 9 of the frame 7 slide backwards.

1

office chairs

2

Seat (from 1 )

3

Backrest (from 1 )

4

left armrest (from 1 )

5

right armrest (from 1 )

6

Cultivation support apparatus

7

Frame (from 6 )

8th

long left frame tube (from 7 )

9

long right frame longitudinal tube (from 7 )

10

short frame front pipe (from 7 )

11

short frame rear pipe (from 7 )

12

left hook - shaped frame holder (firmly welded to 8th )

13

right hook - shaped frame holder (firmly welded to 9 )

14

Left holding or clamping device (at 4 For 8th from 7 )

15

right holding or clamping device (on 5 For 9 from 7 )

16

Support strut (for 7 )

17

lower end (from 16 )

18

floor area

19

front edge (from 20 )

20

fabric mat

21

Holding eyes (on 19 from 20 )

22

Tether (between 10 and 21 for attachment of 20 )

23

left margin (from 20 )

24

right margin (from 20 )

25

Holding eyes (on 23 from 20 )

26

Holding eyes (on 24 from 20 )

27

Tether (between 8th and 25 For 20 )

28

Tether (between 9 and 26 For 20 )

29

Top edge (from 3 )

30

left eyelets (at 20 to receive 32 )

31

right holding eyes (on 20 to receive 33 )

32

Tether (to connect 30 from 20 )

33

Tether (to connect 31 from 20 )

34

head end (from 20 )

35

Molding (from 15 )

38

right eccentric lever (from 15 )

39

Fixing screws (on 35 )

40

right pressed part (from 15 )

41

Threaded hole (in 40 For 50 )

42

upper wall (from 35 )

43

lower wall (from 35 )

44

Breakthrough (in 42 )

45

Breakthrough (in 43 )

46

Upper axle end (from 48 )

47

lower axle end (from 48 )

48

Eccentric shaft

49

Breakthrough (in 35 For 38 for the investment of 51 at 52 )

50

Grub screw (in 41 )

51

Effective area (from 38 )

52

Head area (from 50 )

53

upper C-shaped end (from 35 )

54

lower C-shaped end (from 35 )

55

upper end (from 40 )

56

lower end (from 40 )

57

Thread hole (at the top of 35 For 59 )

58

Thread hole (at the top of 35 For 60 )

59

fixing screw

60

fixing screw

61

Latch (on 78 from 8th , latchable in 63 )

62

Latch (on 79 from 9 , latchable in 64 )

63

Rest hole (for 61 at 68 from 8th )

64

Rest hole (for 62 at 69 from 9 )

65

Mat retaining rings (slidable on 78 from 8th )

66

Mat retaining rings (slidable on 79 from 9 )

68

front pipe part (from 8th )

69

front pipe part (from 9 )

70

Wire loops (at 10 For 22 )

71

Wire loops (at 8th . 9 For 28 )

78

rear pipe part (from 8th )

79

rear pipe part (from 9 )

A

clear distance (between 4 and 5 from 1 )

B

Total width (from 7 )

D

Arrow direction (mounting direction of 13 between 35 and 40 )

e

Arrow direction (disassembly direction of 13 out 35 and 40 )

F

foot-side area (from 20 )

K

head-side area (from 20 )

M

Mid-range (from 20 )

L

Length of 7 )

R

Longitudinal axis of the frame longitudinal tube 9

S

Swivel axis (from 16 )

X

Adjustment direction (from 50 for weak clamping of 14 . 15 by 38 )

Y

Adjustment direction (from 50 for strong clamping of 14 . 15 by 38 )

Z

Unlocking / unlatching direction (from 61 . 62 to the solution 63 . 64 )

Claims (10)

Cultivation device ( 6 ) for an office chair ( 1 ) with a seat ( 2 ), a backrest ( 3 ) and two laterally arranged armrests ( 4 . 5 ), for temporary remodeling and remodeling of the office chair ( 1 ) in a recumbent, consisting of a substantially rectangular frame ( 7 ) with two laterally extending frame longitudinal tubes ( 8th , 9 ), a short frame front pipe ( 10 ) and a short frame rear pipe ( 11 ), the frame ( 7 ) in the use position partly above the seat surface ( 2 ) of the office chair ( 1 ) between its two armrests ( 4 . 5 ) and by means of a holding or clamping device ( 14 . 15 ) single-ended on the two armrests ( 4 . 5 ) releasably attachable, and wherein the frame ( 7 ) anderendig on a mounted on it, in use position approximately vertically on the bottom surface ( 18 ) upstanding support strut ( 16 ) is mounted such that the frame main plane in the position of use is approximately horizontal, and from an elongated, in principle approximately rectangular tissue mat ( 20 ), which are single-ended in the space of the frame ( 7 ) is arranged and fixed there, with its front edge ( 19 ) on the front short frame front tube ( 10 ) and their two side edges ( 23 . 24 ) on the frame ( 7 ) are attached, and the other in the position of use on the above about the seat ( 2 ) short frame trailing pipe ( 11 ) of the frame ( 7 ) along the backrest ( 3 ) arc-like up to the upper edge ( 29 ) extends upwards and at the upper edge ( 29 ) is releasably attachable. Cultivation device ( 6 ) according to claim 1, wherein the substantially rectangular frame ( 7 ) is made of two slightly different sized, each U-shaped bent, polygonal cross-section tubes, wherein the completion of the frame ( 7 ) in each case the two U-legs of the smaller sized in cross-section pipe in the two U-legs of the other, larger sized pipe until reaching its position of use inserted and in this position by means of a latching or snap device ( 62 . 64 ) are releasably secured together or with each other, and wherein the nested tube pairs two laterally extending frame longitudinal tubes ( 8th . 9 ) and the front, foot-side U-base a frame front tube ( 10 ) of the frame ( 7 ) and the rear, U side base of a frame rear pipe ( 11 ) form. Cultivation device ( 6 ) according to claim 1 or 2, wherein (a) on the frame inside of both longitudinal frame tubes ( 8th . 9 ) at each of these in the region of its front, the foot-side end a zig-zag-like bent wire welding technology is spotted so that it between the welds a plurality of eyelets ( 71 ), (b) on the frame inside the short frame front tube ( 10 ) in the region of its middle part at this a zig-zag-like bent wire welding technology is spotted so that it between the welds a plurality of wire loops ( 70 ), and (c) on the two frame longitudinal tubes ( 8th . 9 ) in the region of their rear, armature-side end a plurality of along the two longitudinal frame tubes ( 8th . 9 ) loosely slidable mat retaining rings ( 65 . 66 Threaded. Cultivation device ( 6 ) according to one of claims 1 to 3, wherein on both longitudinal frame tubes ( 8th , 9 ) of the frame ( 7 ) in the region of its rear, chair-side end depending on an outside projecting, hook-shaped, non-load-bearing frame holder ( 12 . 13 ) permanently attached or welded. Cultivation device ( 6 ) according to one of claims 1 to 4, wherein (a) the support strut ( 16 ) is an approximately U-shaped bent tube whose two tube legs at the foot end of the frame ( 7 ) on the inside about an approximately horizontally extending pivot axis (S) are pivotally mounted or articulated, wherein (b) in the position of use of the crop-growing device ( 6 ), the two tube legs of the support strut ( 16 ) on the frame front tube ( 10 ) support such that the bottom end ( 17 ) forming U-base of the support strut ( 16 ) on the ground ( 18 ) kink-resistant, rigid and thus rests on accident-proof, and wherein (c) in unloaded rest position of the crop-growing device ( 6 ) the two tube legs of the support strut ( 16 ) to the frame ( 7 ) are swiveled. Cultivation device ( 6 ) according to one of claims 1 to 5 in conjunction with claim 4, wherein the two frame holders ( 12 . 13 ) of the frame ( 7 ) each at the holding or clamping devices ( 14 . 15 ) are releasably attachable, which in turn on the two armrests ( 4 . 5 ) are releasably secured and each have the following features: (a) a shaped in cross-section approximately C-shaped molding ( 35 ), whose upper end in the position of use ( 53 ), from the seat of the office chair ( 1 ), in full width the armrest ( 4 . 5 ) engages over and rests against the outside thereof, and in its in-use position rinnenförmi gem, lower end ( 54 ) the frame holder ( 12 . 13 ) of the frame ( 7 ) introduced in the direction of arrow (D) and is loosely storable; (b) a pressed part ( 40 ), whose upper end in the position of use ( 55 ) from the seat of the office chair ( 1 ) seen on the armrest ( 5 ) in full width on the inside of the armrest ( 4 . 5 ), and its lower end in the position of use ( 56 ) has a concave shape which on the frame holder ( 12 . 13 ) of the frame ( 7 ) from the seat of the office chair ( 1 ) is applied in full width, and (c) one in front of an opening ( 45 ) of the wall ( 42 . 43 ) of the molded part ( 35 ) approximately in the center of the same pivotally mounted eccentric lever ( 38 ) with an eccentric lever effective area ( 51 ), which in the position of use on a head surface ( 52 ) one behind the Durchbrechnung ( 45 ), in a Gwindbohrung ( 41 ) of the pressed part ( 40 ) screwed grub screw ( 50 ) is applied, wherein by operating the eccentric lever ( 38 ) whose effective area ( 51 ) against the head surface ( 52 ) in the pressed part ( 40 ) screwed grub screw ( 50 ) and thus the price part ( 40 ) single-ended against the armrest ( 5 ) and other end against the frame holder ( 12 . 13 ), whereby the holding or clamping device ( 14 . 15 ) on the armrest ( 4 . 5 ) on the one hand and between the molded part ( 35 ) and the pressed part ( 40 ) and initially loosely mounted frame holders ( 12 . 13 ) are clamped on the other hand in such a way that a safe use of the crop-growing device ( 6 ) is guaranteed. Cultivation device ( 6 ) according to any one of claims 1 to 6, wherein (a) the on the frame ( 7 ) to be fastened, approximately rectangular cut tissue mat ( 20 ) along their margins ( 23 . 24 ) and at a distance from these in their foot-side region (F) and in their central region (M) group-like arranged eyelets ( 25 . 26 ), (b) the fabric mat ( 20 ) along its front, foot-side edge ( 19 ) and at a distance to this a number of eyelets ( 21 ), and (c) the fabric mat ( 20 ) along their side edges ( 23 . 24 ) and at a distance from these in their head-side region (K) group-like arranged eyelets ( 30 . 31 ) having. Cultivation device ( 6 ) according to one of claims 3 and 7, the fabric mat ( 20 ) is fixed (a) by means of a tether ( 22 ), the eyelets ( 21 ) of the fabric mat ( 20 ) with the front frame tube ( 10 ) arranged wire eyelets ( 70 ) connects; (b) by means of a tether ( 28 ), the eyelets ( 26 ) of the fabric mat ( 20 ) with the on the frame longitudinal tubes ( 8th . 9 ) arranged wire eyelets ( 71 ) connects; (c) by means of a tether ( 27 ), the eyelets ( 25 ) of the fabric mat ( 20 ) with the on the frame longitudinal tubes ( 8th . 9 ) loosely threaded mat retaining rings ( 65 ), and (d) by means of a tether ( 32 ), the eyelets ( 30 ) at the head end ( 34 ) of the fabric mat ( 20 ), and by means of a tether ( 33 ), the eyelets ( 31 ) at the head end ( 34 ) of the fabric mat ( 20 ), wherein the fabric mat ( 20 ) in its central area (M) approximately above the seat surface ( 2 ) along the backrest ( 3 ) upwards in an arc, and the end ( 34 ) of the fabric mat ( 20 ) over the top edge ( 29 ) of the backrest ( 3 ) and thus in the position of use of the crop-growing device ( 6 ) is secured. Cultivation device ( 6 ) according to claim 6, wherein the upper end ( 53 ) of the molded part ( 35 ) with the help of two fixing screws ( 59 . 60 ) on the armrest ( 4 . 5 ) is fastened such that the complete holding or clamping device ( 14 . 15 ) even at the armrest ( 4 . 5 ) may remain if after releasing the eccentric lever ( 38 ) the frame holder ( 12 . 13 ) of the frame ( 7 ) from the lower end ( 54 ) of the C-shaped molded part ( 35 ) is pulled out in the direction of the arrow (E) in order to 6 ) from the office chair ( 1 ) to remove. Cultivation device ( 6 ) according to claim 6 or 9, wherein the degree of clamping of the holding or clamping device ( 14 . 15 ) on the armrest ( 4 . 5 ) on the one hand and the frame holder ( 12 . 13 ) between the molded part ( 35 ) and pressed part ( 40 ) on the other hand by the more or less deep into the threaded hole ( 41 ) of the pressed part ( 40 ) screw-in grub screw ( 50 ) is variable, wherein the distance between the active surface ( 51 ) of the eccentric lever ( 38 ) and the top surface ( 52 ) of the grub screw ( 50 ) varies.