FI87517C - ANORDNIG FOER LUTNINGS- OCH / ELLER HOEJDREGLERING AV ARBETS- ELLER BORDSPLANET PAO EN MOEBEL MED FUNDAMENT - Google Patents

Description

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Adjusting device for adjusting the inclination and / or height of the work or table level of the base furniture. -Anordning för lutnings- och / eller höjdreglering av Arbets-eller bordsplanet pa en Möbel med fundament.

The invention relates to an adjusting device according to the preamble of the claim for adjusting the inclination and / or height of the working or table level of furniture.

Such known adjustment devices can be used to adjust the inclination and / or height of the worktop or table of the furniture. The lifting element is implemented as a fork with which the level is raised and lowered. When the plane is in its lowest position, the fork also goes to its lowest position, where its arms form an obtuse angle. A large force is therefore required to raise the level, because the obtuse angle formed by the branches causes an unfavorable distribution of forces. In addition, even a small adjustment movement of the lifting fork causes a relatively large movement at the work or table level. As the adjustment continues, the force ratios improve so that the fork can be operated with less force. In this case, however, the movement produced also decreases. The force-lift-movement ratio of this known control device is thus uneven. In addition, the lifting fork is sensitive to transverse loading because the interconnected arms of its joints can bend. As a result, the fork may not be usable at all. In addition, this lifting fork requires a lot of space during installation.

It is an object of the invention to develop a control device in such a way that it is easy to handle, that it requires little installation space and that its power-to-lift ratio is constant for its parties. The task is solved in the invention as shown in the characterizing part of claim 1.

With the help of a curved rack, it is possible to keep the ratio of force and lifting movement constant for its parties throughout the adjustment range. The force required to lift is therefore approximately the same in all positions on the work or table level. The lifting movement towards the rack adjustment movement remains approximately constant, so that the work or table top can be easily and precisely adjusted to the desired position.

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The teeth are reliably on the controller, so the adjustment is simple to perform. Because the rack can be a flat bar, it can be installed near the side wall of the furniture so that it does not need a lot of space.

Fig. 1 shows a side view of an embodiment of a reinforcement according to the invention, Fig. 2 shows a section according to line II-II of Fig. 1, Fig. 3 shows a side view of a second embodiment of a reinforcement according to the invention, Fig. 4 shows a section according to line VV of Fig. 3, Fig. 5 shows a third embodiment Fig. 6 shows a section along the line VI-VI in Fig. 5, Fig. 7 shows a side view of a fourth embodiment of the iron according to the invention, Fig. 8 shows a section along the line VII-VII in Fig. 7, Fig. 9 shows a side view of a fifth embodiment of the iron according to the invention, Fig. 10 shows a section Fig. 9, Fig. 11 is a top view of Fig. 9, Fig. 12 is a line XII-XII view of Fig. 14 of a sixth embodiment of the iron according to the invention, Fig. 13 is a view of Fig. 12 below the rail, Fig. 14 is a cross-sectional view of Fig. 12, Fig. 15 is a front view. Fig. 16 shows the working surface of the furniture of Fig. 12 in an elevated position, Fig. 17 shows another embodiment of the lifting element of the iron according to the invention.

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The iron is used to adjust the inclination and / or height of furniture, a table, etc. at the work or table level. The iron according to Figures 1 and 2 has a plate 1 fixed to the inside of the side wall 3. Instead of the side wall 3, the iron plate 1 can also be fixed to a leg or a base part. The opposite side wall 3 '(Fig. 2) has a second iron plate 1' similar to 1. Attached to the plate 1 is a mechanism 4 for rotating a shaft 5 running between the plates 1 and 1 '. The mechanism 4 has a screw wheel 6, the helical toothing of which non-rotatably interleaves with the toothing of the second screw wheel 7 on the shaft 5. The screw wheel 6 has a drive shaft 8 which runs parallel to the plate 1 and joins a clutch rod 9 which leads forward to the seating side of the respective furniture or table. At the other end of the clutch rod 9 (not shown), a crank can be inserted, by means of which the screw wheel 6 and thus also the shaft 5 can be rotated by means of the mechanism 4. The crank can also be fixed to the rod 9. The mechanism 4 is in a housing 10 fixed to the plate 1. The screw wheel 7 extends downwards slightly out of the housing 10.

At the other end of the shaft 5 there is a non-rotatable and axially secured gear 11, which is also in the housing 10 ', from which it protrudes slightly from below (Fig. 2).

The gears 7 and 11 engage the partially circular tooth sizes 12, 12 'which run below them along the plates 1 and 11. The other end of the racks 12, 12 'is fixed to the work or table plane 13. Below the plane 13 there are recesses 15, 15' into which the branch 16, 16 'of the corner rails 17, 17' rises. The rails are fixed below the plane 13 by means of their horizontal arms 18, 18 '. The vertical arms 16, 16' extending into the recesses 15, 15 'have a longitudinal slot 19 to which a guide bolt 20, 20' is attached to the free ends of the racks 12, 12 '. will. The slot 19 ensures that the relative movements between it and the racks 12, 12 'occurring when the level 13 is raised can take place.

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At one end 21 of the racks 12, 12 'there is a second guide bolt 22, 22' which, like the bolt 20, 20 ', is fixedly connected to the rack. It goes into the slot 23, 23 'of the iron plates 1, 1'. The slots 23, 23 'are as curved as the racks 12, 12' and restrict the movement of the racks. In Fig. 1, the tooth 12 is shown by a solid line in its end position, where the plane 13 is in its lowest position. In this position, the guide bolts 22, 22 'are at one end of the slots 23, 23'.

In order to adjust the inclination and / or height of the plane 13, the mechanism 4 is actuated by a clutch rod 9. As the gears 7 and 11 engage the racks 12, 12 ', they move to the right in Fig. 1 in their longitudinal direction. The racks 12, 12 'are then supported by a support roller 24 which is on the side 13 opposite the plane 13 of the rack 12, 12' in the area between the mechanism 4 and the angle rail 17, 17 '. Since the bolts 22, 22 'are in the slots 23, 23', they guide the racks in the adjustment. The diameter of the bolts corresponds to the width of the slots. The length of the slots 23, 23 'limits the adjustment distance of the racks 12, 12'. Figure 1 shows in broken lines the end position of the rack 12, in which the guide bolts 22, 22 'have slots 23, 23' at the end of the guide bolts 20, 20 'and in which the plane 13 is in its most inclined position.

Since the shaft 5 connects the gears 7 and 11, the actuation of the mechanism 4 enables both racks 12, 12 'so that the plane 13 tilts evenly over its entire length or width.

With the described iron it is also possible to adjust the height of the level 13. To do this, there must be a similar adjusting device at the opposite end of the plane, so that the height of the plane can also be adjusted at that end. It is expedient to place the adjusting mechanisms in pairs so that the height and inclination of the plane can be adjusted without interruption.

The mechanism is housed in a housing 10, 10 '. Since the irons are located inside the side walls 3, 3 '2, 2' of the respective furniture, they are not visible to the outside. Only the level of the lower side 14 and 5> < '5i7 of the side walls 3, 3' between the tooth bar 12, 12 'outward part is shown without affecting interfering. The irons with control mechanisms are narrow and low, so that they can be installed even in a small installation space. The overlapping screw wheels 6, 7 of the mechanism 4 require little space. The entire control mechanism can simply be mounted in place by means of the iron plate 1, 1 '. The shaft 5 is only a short distance from the upper edge of the side walls 3, 3 'so that it does not interfere. An electric motor can also be connected to the coupling rod 9, in which case the height and / or inclination of the level 13 can be adjusted motorically. With the described adjustment mechanism, almost the same ratio of force and movement is achieved in the entire adjustment range of the racks 12, 12 '. Ts. over the entire adjustment range of the racks 12, 12 ', approximately the same adjustment movement is achieved with approximately the same force. This allows the user to raise and lower the level in a controlled manner over the entire adjustment range.

The application of Figures 3 and 4 differs from the previous one only in that the mechanism 4a is not on the iron plate 1, but about halfway through the shaft 5. Its propellers 6a and 7a are positioned in the same manner as above. The screw wheel 7a is non-rotating on a shaft 5 having a gear wheel 11a, 11a 'at each end non-rotating. The gears are secured in the axial direction and engage the racks 12, 12 'as shown. The screw wheel 6a, on the other hand, is non-rotating on the drive shaft 8a, which is connected to a clutch rod 9a to which a crank or an electric motor can be connected as shown. The shaft 5 rotates by actuating the mechanism 4a. The gears 11a, 11a 'then move the racks 12, 12' as described. The control mechanism of Figures 3 and 4 is otherwise similar to the embodiment of Figures 1 and 2.

The embodiment of Figures 3 and 4 can be applied if there is no mounting space for the coupling rod 9a in the side walls. In this case, the mechanism 4a is placed between the control mechanisms, in the application halfway between the shaft 5.

The embodiment of Figures 5 and 6 essentially corresponds to the embodiment of Figures 1 and 2. Instead of the continuous shaft 5, the mechanism 4b is 607517 provided with a shaft stub 27, 21 ', to which it is connected by a screw wheel 7b. The shaft stubs 21, 21 'of the opposing mechanisms 4b are non-rotatably connected to each other by a tube 28, so that the shaft stubs and the tube form the axis of the iron. The advantage of this application is that the pipe 28 can be cut to the desired length at the installation site. This makes it easy to take into account installation tolerances in a simple way.

The embodiment of Figures 7 and 8 is essentially the embodiment of Figures 5 and 6. The only difference is that the horizontal arms 18c, 18c 'of the corner rails 17c, 17c' are fixed below the work surface 13. The vertical arm 16c, 16c1 of the corner rails 17c, 17c 'is connected to the rack 12, 12' via a guide bolt 20, 20 '. The vertical branch 16c, 16c 'has a long slot 19 for the control bolt. The vertical branch points downwards in the direction of the housing 10, 10 '. Since there are no recesses below the worktop in the corner rails 17c, 17c 'below the worktop, the worktop can be manufactured simply and installed easily.

In the embodiment of Figures 9-11, the rack 12 is largely covered by a U-shaped cross brace 30. The bracket runs between the two legs 3 of the furniture. Figures 9-11 show only one leg 3. On opposite sides of the worktop 13 there are always two legs each. The arms 31, 32 of the cross brace 30 point downwards, while the cross bridges 33 are flush with the end 34 of the leg 3 (Figures 9 and 10). The rack 12 passes through the recess 35 of the cross bridge 33. It can be seen from Figure 9 that the main part of the rack 12 is covered by the arms 31, 32 of the cross member 30.

Below the work surface 13 14 there are recesses 15 into which the vertical branch 16 of the corner rail 17 rises. Sovellutusesimerkkei previous Hin is the difference being that the angle rail 17, horizontal leg 18 is co-verrukseen recess 15 associated 36 (Figure 10), so that the horizontal branch of the work platform 13 will not rise above the lower side 14. The gap between the work surface 13 and the end 34 of the leg 3 or the cross bridge 33 of the cross member 30 in the lowest position of the work surface can thus be kept very small.

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The vertical branch 16 of the angle rail, in turn, has a long slot 19 with a guide bolt 20 fixedly connected to the rack 12.

On the side of the cross bracket 30 away from the branch 31 of the branch 32 there is a mechanism 4d with screw wheels 6d, 7d. The screw wheel 6d is again non-rotatably connected to the clutch rod 9d, which runs along the branch 32 to the seating side of the respective furniture or table. Associated with the second screw wheel 7d is a shaft stub 27d, which is in communication with the tube 28d in connection with the shaft stub of the opposite machine. The housing 10 is detachably attached to the leg 32 of the cross member 30 by a mounting plate 37.

The shaft stub 27d passes through a branch 32 of the bracket 30 (Figure 10). The end between the shaft arms 31, 32 has a gear 11d which interlocks with the rack 12. The gear 11d is non-rotatably mounted on the shaft stub and secured in the axial direction. The cross bracket on the opposite side also has a gear that interlocks with the corresponding rack.

Unlike previous embodiments, the rack 12d has two sub-circular slots 38 and 39 spaced apart. The slot 38 has a guide bolt 40 attached to the bracket 1. The support roller 24 further supports and guides the rack 12d.

When the clutch rod 9d is rotated, the shaft stub 27d and the tube 28d fixedly connected thereto are rotated by the mechanism 4d. The gears 11d move the racks 1 2d and at the same time raise or lower the work platform 13. The rack 12d is protected in the cross bracket 30. The work platform 13 can extend close to the cross bridge 33 of the bracket 30 so that the distance between the work platform and the bracket is small. The rack 12d is therefore barely visible to the outside.

Of course, instead of the slot 38, the rack 38 may also have, as in the previous examples, a guide bolt which enters the corresponding slot of the bar. Likewise, the guide bolts 22, 22 'in the previous examples may be in the rail, whereby the racks have guide guide slots for the bolts.

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In the embodiment of Figs. 12 to 16, the adjusting device has an L-shaped iron 101 having a horizontal branch 102 on a foot, a stand 103, etc. The vertical branch 104 is parallel to the inner side 105 of the stand 103. Near its lower edge 106 is a longitudinal slot 107 (Fig. 12) which, viewed from the direction of the user sitting in front of the furniture, is at the rear end of the leg 104. For example, a guide portion 108 in the form of a bolt is inserted into the slot 107 and is attached to the end of the rack 109. As in the examples described above, the rack bends to an angle of less than 180 °. At the other end of the rack, on the user's side sitting in front of the furniture, there is, for example, a bolt-shaped guide part 110 which goes in the same way as the rack into the collapsible gap 112 of the spacer 112. The gap 111 is only part of the length of the rack 109.

Right next to the rack 109 is a second rack 109 'which has the same shape and thus curves less than 180 °. The rack 109 'has, for example, a guide part 110' in the form of a bolt, which is right next to the guide part 110 and goes into the curved slot 111 'of the spacer plate 112. The slot 111 'curves as much as the rack 109' and extends only less than half the length of the rack. At one end, the rack 109 'is attached to the vertical arm 104 of the iron 101. It can be seen from Figure 12 that the racks 109, 109' are mirror image. In addition, they are the same size and curve convexly relative to the worktop or table top of the furniture.

Both racks 109, 109 'are supported on their convex side of the work surface 13 by a support roller 114, 114'. The racks 109, 109 'on the opposite side of the teeth 115, 115' extending from the guide member 110, 110 'side end of the rack slightly above half-way. The toothing is gripped by a gear 116, 116 'which is non-rotating on the shaft section 117, 117'. The connecting piece 118, 188 'non-rotatably connects the shaft section to the connecting shaft 119, 119', which extends to the opposite base 103.

The racks 109, 109 'are located between the vertical branches 120, 121 of the two L-shaped rails 122, 123. The horizontal arms 124, 125 of the rails are attached below the work surface 113 (Fig. 14).

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The gears 116, 116 'are rotatably mounted in the openings of the vertical arms 120, 121. Attached to the side of the leg 121 remote from the leg 120 are two housings 126, 126 'each having a non-rotatable shaft wheel 117, 117' on the shaft body 117, 117 '. They each engage the propellers 128, 128 'in the housings 126, 126', of which only the propeller 128 is shown in Fig. 14. The propellers 128, 128 'are on a guide shaft 129 running parallel to the vertical arm 121 of the rail 123 (Fig. 13) and extending to the seat side of the furniture. A crank 130 can be inserted into the steering shaft 129. The screws 128, 128 'and the steering shaft 129 are located above the connecting shafts 119, 119'.

The control shaft 129 can be used to actuate both mechanisms 131, 131 'in the housings 126, 126' simultaneously. The housing 126 'has a switch 132 by which the mechanism 131' can be separated from the shaft so that it does not operate when the shaft 129 rotates. The operation of the switch 132 is accomplished by moving the steering shaft 129 in the axial direction, as described in more detail below.

The connecting shafts 119, 119 'perpendicular to the steering shaft 129 connect the mechanisms 131, 131' to similar mechanisms of the opposite base part.

The spacer 112 is between the vertical branch 104 of the iron plate 101 and the vertical branch 120 of the rail 122. The spacer plate 112 has two parallel, vertical slits 133, 134 (Fig. 12) into which guide members 135, 136 rising perpendicular to the vertical branch 120 of the rail 122 engage.

In the horizontal lower position of the work surface 113 of Fig. 12, the guide portion 108 of the rack 109 is at the rack 109 'end of the slot 107. The second guide portion 110 is at the corresponding end of the curved slot 111. The spacer 112 is so low that its oblique edges ίο B75 i / 137, 138 rest on the guide portion 108 of the rack 109 and the articulated shaft 139 of the rack 109 '. The guide portions 135, 136 of the rail 122 are then at the lower end of the slots 133, 134 of the spacer 122. The spacer is covered by the vertical branch 120 of the rail 122. The gears 116, 116 'are at the distal ends of the teeth 115, 115' of the racks 109, 109 '. To adjust the inclination of the work surface 113 (Fig. 15), the guide shaft 129 is pushed back from the seating side of the furniture in the axial direction. The switch 132 then deactivates the mechanism 131 '. When the guide shaft 129 is now rotated by the crank 130, the mechanism 131 rotates the gear 116. The rack 109 then moves relative to the rail 122 along a circular arc. Since the guide portion 108 of the rack 109 is in the slot 107 of the iron 101, the side of the work surface 113 opposite to the seat side rises as the rack moves. The guide portion 135 of the rail 122 then moves in the slot 133 of the spacer plate 112 until it hits the other end of the gap and takes the spacer plate 112 with it (Fig. 15). At the opposite end, the oblique edge 138 of the spacer 112 pivotally rests on the hinge portion 139 of the rack 109. The rack 109 'simultaneously pivots about the hinge portion 139 but does not move relative to the rail 122. The guide portion 110 of the rack 109 moves in the slot 111 of the rail 122. The inclination of the work surface 113 is greatest when the guide portion 110 strikes the end of the slot 111 remote from the rack 109 '. As the gear 116 engages the rack 109, the work surface 113 remains in position as the rack 109, its guide portion 108 and the bracket 101 support it on the base portion 103. so that the height or inclination of both sides of the worktop 113 is adjusted equally.

If the seated side of the gear rack 109 'is to be adjusted, the control shaft 129 is pulled back in the axial direction, so that the apparatus 131' of switch 132 is connected. The mechanisms 131, 131 'are then driven simultaneously by the control shaft 129. The racks 109, 109 'then move almost simultaneously from their initial positions as in Fig. 12, so that the guide part 110 of the rack 109 moves in the slot 111 of the rail 122 and the guide part 108 in the slot 107 of the iron plate 101 11 8751 77. The guide part 110' of the second rack 109 'also moves in the slot 122 111 '. In addition, the rack 109 'pivots from its joint 139 relative to the iron 101. Due to the opposite movements of the racks 109, 109 ', the work surface 113 rises evenly. The guide portions 135, 136 of the rail 122 also raise the spacer 112 as they move to the upper ends of the slots 133, 134 of the spacer. The highest position of the work surface 113 is reached when the guide parts 110, 110 'of the racks 109, 109' have moved to the distal ends of the slots 111, 111 '.

When lowering the worktop back, the spacer 112 hanging in the guide portions 135, 136 is lowered until its beveled edges 137, 138 abut the guide portion 108 and the hinge portion 139. The movements are arranged so that the spacer 112 does not settle until the guide portion 108 is close to the figure. 12 in the end position. By using the detachable spacer 112, a long adjustment distance is achieved without the rail 122 having to be particularly high. Therefore, the vertical leg 120 of the corner rail 122 does not overlap the horizontal portion of the base portion 103 in the lower position of the work surface 113 (Fig. 12). The spacer 112 is also, viewed in the axial direction of the connecting shafts 119, 119 ', covered by a vertical branch 120. Also in this application, the worktop 13 can be lowered so that it leaves only a small space in the stand 103. As a result, the adjusting device is only slightly visible from the outside.

Instead of the racks 109, 109 ', a tooth segment 140 can also be used as the lifting element, as in Fig. 17. The tooth segment has a recess 141 with a toothing 143 at one curved edge 142. The gear 116, 116' engaging this toothing partially passes through the recess 141. The length of the recess 141 is approximately the same as that of the toothing 143. The tooth segment 140 further has an opening 144 for the guide portion 108 and the hinge portion 139 and an opening 145 for the guide portions 110, 110 '. The tooth segment is quite stable and is simple to manufacture.

Claims (20)

A control device for controlling the slope and / or height of a working or table plane (13, 113) provided with a base (3, 3 ', 103), said control device having at least one lifting element consisting of beak-shaped rack (12, 12') , 12d, 109, 109 ', 140) which engage on the work or table plane and which is in communication with an operation (4, 4a, 4d, 131, 131') provided with a gear (7, 7a, 7d, 11d, 116, 116 ') in engagement with a rack (23, 23', 40, 111, 111 '), characterized in that the rack (12, 12', 12d, 109, 109 ', 140) with its one ends are connected to the plane of the furniture and with its other end to the base of the furniture (3, 3 ', 103). Control device according to claim 1, characterized in that the rack (12, 12, '12d, 109, 109', 140) has at least one guide part (22, 22 ', 38, 110, 110') with the aid of which the rack is inserted. in the steering. Control device according to claim 2, characterized in that the guide member (22, 22 ', 38, 110, 110') is a bolt, roller or the like, which engages it in the form of a slot (23, 23 ', 107, 111, 111 ') implemented the control. Controller arrangement according to claim 2, characterized in that the guide member (38) is a slot located in the rack (12d) in which it is in the form of a bolt, roller or shaft. pre-set steering intervenes. Control device according to any one of claims 1-4, characterized in that at the work or table top (13). . is attached a portion (17, 17 ', 17c, 17c') to which one end of the rack (12, 12 ', 12d) attaches and which in the main room is an angular rail, one of which has a branch (18, 18', 18c) , 18c ') is attached to. the lower side (14) of the work or table top (13). »Τη r- Λ rj Control device according to claim 5, characterized in that one branch (16, 16 ') of the angular rail (17, 17') lies in a recess (15, 15 ') in the lower side (14) of the work table or table (13) and in the main space comprises a slot (19), in which the part (20, 20 ') of the rack (12, 12', 12d) engages. Control device according to claim 5, characterized in that one branch (16c) of the angular rail (17c) points in the direction of the rack (12d). Control device according to any of claims 5-7, characterized in that the rack (12, 12 ', 12d) is moved to the branch (17, 17') branch (16, 16 ') from the side and in the main room is supported from its opposite the side (25) of the work or table top (13, 113 ') having at least one support portion (24, 114, 114'), which in the main space is a roller. Control device according to any one of claims 1-8, characterized in that it comprises a synchronizer (7, 5, 11; 7a, 11a: 7d, 27d, 28d, 11d, 117, 117, '119, 119') with a in the main space on the transverse axis of the rack (12, 12 ', 12d, 109, 109', 140) of the shaft (5, 27d, 28d, 117, 117 ', 119, 119'), which starts in connection with the operation (4, 4a, 4b, 4d, 131, 131 '). Control device according to any one of claims 1 to 9, characterized in that the rack (12, 12 ') is moved sideways to a fitting (1, 1') in which the shaft (5) or the shaft (27, 27 ', 27d) rotatably stored. Control device according to any one of claims 1-10, characterized in that the rack (12d, 109, 109 ') of the bulk is covered. is 8751 7 Control device according to claim 11, characterized in that the rack (12d) lies in a U-shaped transverse support (30) with a gear (11d) engaging with it which is on the shaft (5) or the shaft (27d) unrotable, and that the rack (12d) and the gear (11d) lie between the branches (31, 32) of the cross support (30). Control device according to any one of claims 1-12, characterized in that it comprises two adjacent toothed rods (109, 140), one end of which is led to one fitting (101) and the other end movable to one of the the working or table top (113) is connected to a rail (122) with a slot (111) of a circular shape, in which the rack (109, 140) engages with its guide part (110). Control device according to claim 13, characterized in that the bracket (101) has a longitudinal groove (107), in which the control part (108) of the rack (109) engages. Control device according to claim 13 or 14, characterized in that one end of the rack (109 ', 140) is led to a rail (122), in the main space movable to a slot (1111) of semicircular format and the other end to a fittings (101). . ; Control device according to any one of claims 13-15, characterized in that the rack (109, 109 ', 140) carried between two fittings (122, 123) can be controlled simultaneously. Control device according to any one of claims 13-16, characterized in that an intermediate disc (112) is arranged between the bracket (122) and the bracket (101) and which can be adjusted in height in proportion to the bracket (122). . 19 8751 7 Control device according to claim 17, characterized in that the fitting part (122) has at least two engravers (135, 136) which engage vertical slots (133, 134) in the intermediate disc (112), which lie down in their end position on the rack ( 109) guide member (108) and one gear (109 ') guide member (139). Control device according to any one of claims 13-18, characterized in that the drive connection between the operation (131) of the rack (109 ') and the steering shaft (129) can be interrupted by a clutch (132). Control device according to any of claims 1-19, characterized in that the rack is a gear segment (140), in which an edge of its depression (141) has a gear (143).