DE3239077A1 - Seating and/or lying device, in particular bed for the sick and/or the disabled, having at least one swivellable frame part which is hinged to a frame - Google Patents

Abstract

Published without abstract.

Description

Sitting and / or lying device, in particular

Bed for the sick and / or disabled, with at least one on one Frame articulated pivotable frame part The invention relates to a seat and / or lying device, in particular bed for the sick and / or disabled, with at least one pivotable frame part articulated on a frame.

In the context of the invention, seating arrangements are to be understood as follows: Seating furniture in the living room and office, in particular armchairs and chairs, with a seat or seat shell whose inclination is adjustable. In addition, it can be used, for example, by means of Gas springs be adjustable in height. The backrest can also be arranged to be pivotable so that the user can adjust it optimally according to his body size can. These seats and armchairs can additionally be adjustable, i.e. height adjustable and / or have pivotable headrests and footrests. Furthermore are among them Car seats and airplane seats are to be understood as swiveling and / or height-adjustable Seat shells and / or pivotable backrests and / or pivotable and possibly additionally adjustable in height Head and / or foot rests. Included are still hospital chairs and chairs for the disabled and handicapped, treatment chairs for dentists, examination chairs for doctor, for example for gynecologists, the one pivotable seat surface and / or pivotable backrest and / or pivotable Support headrest and / or pivotable armrests and / or pivotable foot exhibit.

Seat and / or reclining devices include armchairs, for example Understand the television set by adjusting and locking accordingly the individual parts can be transformed into a couch, or couches, which can also be used as seating by adjusting them accordingly.

For the purposes of the invention, lying devices are beds for healthy people, Sick, disabled and handicapped people understand the at least one swiveling headboard so that the head comes to lie higher. Beds are also underneath to understand, which also have a pivotable foot part, so that the feet and lower legs are brought into a higher position than the trunk of the X body can. These beds can also be designed to be adjustable in height and / or around their longitudinal or transverse axis can be pivoted. General is the framework where appropriate height adjustable and / or adjustable in incline.

The known sitting and / or lying devices have elaborate mechanical constructions, and can sometimes only be set with a lot of effort will. Sick, disabled or disabled people cannot make these settings themselves undertake and are dependent on the help of others. This is especially true for hospital beds, the adjustment can only take place in rough steps and an optimal setting is not possible for the patient.

The invention is based on the object of providing a sitting and / or lying device, especially a bed for the sick and / or disabled, with at least one on one possibly height-adjustable and / or adjustable in inclination frame articulated to create pivotable and / or height-adjustable frame part, so that the person concerned in the sitting or lying position, a practically stepless adjustment depending on can make from his optimal sitting or lying position, i.e.

the ergonomically optimal position for him in his respective Can adjust the sitting position or in its position, whereby it is for the sick, the disabled, It is possible for the disabled to adjust this without a stranger even with great disabilities Help to carry out. Furthermore, this adjustment should be done so that during the Pivoting and setting it is not possible that the person concerned or present People are injured.

This object is achieved according to the invention in that for pivoting of the frame part a spindle with its one end portion pivotable on the frame part hinged and is arranged axially adjustable in a housing, the housing has at least one electric drive for adjusting the spindle and is pivotably arranged on or in the frame. Through these measures will achieved that the spindle during the pivoting of the articulated frame part can perform an axial adjustment, the forces in the axial direction of the Spindle, i.e. in the direction of its axis.

by the articulation of one end portion of the spindle to the pivotable one Frame part and through the pivotable mounting of the housing on or in the frame the pivotable frame part can have a circular arc-shaped movement and the spindle execute a linear movement without the spindle or the articulation points transverse forces occur on the spindle or on the frame part. This is essential to the invention the use of a spindle, as it enables sensitive and stepless adjustment, large swivel ranges allowed, with only low drive forces being required. According to the invention, large adjustment ranges are swept over without the known structurally complex solutions with racks, meshing gears and the like required are.

In principle, the spindle could be firmly connected to the housing The nuts can be rotatably mounted and adjusted via a driven gear. According to a preferred embodiment, in a further embodiment, the Invention in the housing the worm wheel of a Worm drive arranged, wherein the worm wheel has an axial bore with an internal thread and is rotatably arranged on the spindle passed through the housing and with the output pinion designed as a worm, at least one on the housing arranged electric drive is in engagement. Through these measures is in a simple way a sub or

Transmission gear created that allows large forces to transmit the frame part to be pivoted with low-power motors, so that the adjustment takes place so slowly that it corresponds to the physical sensations e.g. of the patient.

In particular, it is possible to use low-voltage motors that powered by a battery, i.e. independent of the mains. This adjustment takes the Affected oneself, depending on the physical sensations.

According to a preferred embodiment, the housing is radial Direction divided into two parts, the housing halves with the end faces of the worm wheel Form thrust bearings. By these measures, the reaction forces are in a simple manner for the worm wheel brought on, whereby by the radial division of the housing into two parts easy assembly is enabled.

According to a further embodiment, are between the housing halves and the end faces of the worm wheel needle bearing arranged as a thrust bearing. this is then advantageous if the housing is not in the radial direction, but is divided in two in the axial direction.

In yet another embodiment of the invention, the housing or the housing halves have guide sleeves for the spindle. This intends to all the advantage that the spindle is not guided exclusively by the worm wheel is taken over and that with extreme load on the spindle, any deflections the spindle, which are then very slight, can be kept away from the worm wheel so that the spindle always runs smoothly during adjustment is.

The worm wheel can be driven by the output pinion designed as a worm driven by an electric drive. It can also have multiple electrical Drives may be provided, each with its output pinion designed as a worm are in engagement with the worm wheel.

In yet another embodiment of the invention are in the housing two worm gears arranged by worm drives, the worm gears each have a coaxial bore with an internal thread and on that through the housing guided through spindle are arranged and each with a designed as a worm Output pinion of arranged on the housing electric motors are in engagement. By this measure it is achieved that with the same design of the worm drives the drive power is doubled.

In principle, more than two worm drives would be possible in this way to be arranged in the housing. However, it is about the reaction forces of the individual worm drives To be able to transfer better consists in yet another embodiment of the invention the housing consists of at least two modular components or Composable housing components with å an electric drive for each joint adjustment of the spindle. The particular advantage of this design principle is that, depending on the application, several components are combined and that in the event of malfunctions in or failure of a component an exchange instead of a repair can take place.

Since the spindle does not have to rotate when it is being adjusted, has according to the invention one end portion of the spindle for articulation to the pivotable one Frame part a bore for a pivot pin arranged on the pivotable frame part on.

In a further embodiment of the invention, the housing has two lateral ones Pin on which are pivotably mounted in the frame. This is an easy one Suspension of the housing created so that it is with the pivotable frame part hinged spindle can perform appropriate pivoting movements and the linear movement of the spindle into the circular arc-shaped movement of the articulated on it Swivel part is implemented.

In yet another embodiment of the invention, the housing is mounted pivotably in a holding frame, the holding frame with the frame the sitting and / or lying device is pivotably connected. The special advantage is that a finished unit is created, which is only on the frame the seat or

Lying device is attached and its spindle with the pivotable Frame part is to be articulated.

In a further embodiment of the invention, according to a further preferred embodiment, the housing and the holding frame kit for retrofitting per se known seating and / or reclining devices, which instead of the known mechanical adjustment devices are installed.

In yet another embodiment of the invention, the housing a bellows for one end portion of the spindle, so that the spindle is kept free of dust in this area.

For this purpose and for any injuries caused by the other person as well to prevent through the housing spindle section has for this the other end section of the housing on a protective tube.

In principle, any desired electric motors can be used for the electric drive come into use. It turned out, however, that to grant the electrical Safety best for dust-protected 12 or 24 volt electric motors mission come. These enable battery operation and meet the sanitary safety regulations and do not require extensive protective measures. Therefore come according to the invention preferably windshield wiper motors for motor vehicles with one designed as a worm Output shaft used, which are easily available everywhere and also via accumulators, which are provided, for example, in hospital chairs. On the other hand these wiper motors can be easily procured, preferably you can they are removed from motor vehicles that have been withdrawn from the market and thus still be supplied to a purpose. The invention therefore also relates on the use of windscreen wiper motors for motor vehicles, regardless of Vehicle type whose output shaft is designed as a worm for the worm drive is.

In yet another embodiment of the invention, these Embodiments based on the lever principle or the principle of power transmission a safety device is provided by means of a roller and chain, which consists of telescopic There is nested pipe sections, the outer pipe section on the Frame is hinged and the inner, guided pipe section, the housing with the Has the spindle and the worm drive and the outer pipe section has stops, which define the two end positions of the guided pipe section. Depending on the Designed as a push or pull drive does one or other stop as an abutment, with a blocking of the pivotable frame part extend the two pipe sections accordingly or move into one another, so that Injuries are excluded.

In yet another embodiment of the invention, it is for pivoting of the frame in the longitudinal and / or transverse direction of the frame on its underside at least one spindle is articulated, the spindle being axially adjustable in the housing is guided, in the housing a worm wheel of a worm drive is arranged, the worm wheel has an axial bore with an internal thread, the worm wheel is arranged on the spindle passed through the housing and with the as Worm-shaped output pinion of an electric drive is in engagement.

For example, there can be four spindles on the underside of the frame of a bed be provided, wherein the housing are mounted on a frame that is when Pivoting the bed about its longitudinal or transverse axis on the floor is based.

Here, the pivoting with a simultaneous extension of all Spindles are done so that the feet on one side of the bed are always on Support the ground and thus transfer the load into the ground.

In yet another embodiment of the invention, the spindles are articulated on the pivotable frame part according to the principle of the two-armed lever. According to the invention, the spindle can also operate on the principle of the one-armed lever be hinged to the pivotable frame part.

According to the invention, the pivotable frame part can also be coaxial its pivot axis have a role, the spindle with a chain the role is positively connected.

The invention is shown in the drawing on the basis of exemplary embodiments explained.

They show: FIG. 1 a first exemplary embodiment with an axially divided Housing in a perspective view, FIG. 2 an axial section through the exemplary embodiment in Figure 1, Figure 3 a second embodiment in perspective with a radially divided housing, FIG. 4 shows an axial section through an exemplary embodiment with two worm wheels arranged in a common housing, FIG axial section through an embodiment for the modular principle, Fig.6 a Exemplary embodiment for a hospital chair or for a car seat, FIG. 7 an exemplary embodiment for a bed, FIG. 8 an exemplary embodiment for a conversion kit for a bed, FIG. 9 an upgrade kit for hospital beds with a longitudinally and transversely axially inclinable lying surface, Fig. 10 articulation and exemplary embodiments of other types -12 Fig.1 shows an embodiment with an axially divided housing, which is designated by 1 is. The housing consists of two housing halves 2 and 3, which are the bearing for the Form worm wheel 4. The worm wheel has an axial bore with an internal thread on and is arranged on the spindle 5 passed through the housing, the with one end (not shown) pivotable on the frame part to be pivoted is hinged. The worm wheel stands with the output pinion designed as a worm 6 of the electric motor 7 in engagement. This electric motor is on the housing half 3 attached. The housing halves each have a pin 8 and 9, with which the housing is pivotably mounted in the frame (not shown) so that the linear movement of the spindle by means of this pin and the pivotable articulation of the one end of the spindle on the frame part to be pivoted into the arc-shaped one Movement of this frame part is implemented.

The housing halves point on both sides (only one side shown) Approaches of hollow cylindrical halves 10, 11, which after assembly of the housing halves, guide sleeves 12 and 13 for the spindle, as can be seen from FIG is to form.

The Fig.2 shows that between the end faces of the housing halves and the end faces of the worm wheel 4 each have a needle bearing 14 or 15 arranged through which the reaction forces are transmitted to the spindle at the same time.

3 shows a further exemplary embodiment in a perspective illustration with radially split housing. The housing 16 consists of the two housing halves 17 and 18, their parting plane in the radial direction, i.e. in one to the axis of the spindle 19 vertical plane. The housing half 17 has a windshield wiper motor 20, the output pinion 21 of which is designed as a worm, which is connected to the worm wheel 22 is in engagement and forms a worm drive with this. The worm wheel has an axial bore with an internal thread and can be rotated on the spindle arranged. The housing half 17 also has two pins 23 and 24 for pivoting of the housing in the frame, not shown. Between the front sides of the Axial thrust bearings are arranged on the bearing halves and the end faces of the worm wheel, which are designated by 25.

4 shows an embodiment with two in one common Housing arranged worm wheels shown in section. The designated with 26 Housing consists of two housing halves 27 and 28, the parting plane of which is in a to Axis of the threaded spindle 29 runs perpendicular plane.

The two worm wheels 30 and 31 are in the housing arranged, wherein between the worm wheel 30 and the housing half 27, the axial thrust bearing 32 and between the worm wheel 31 and the housing half 28, the axial thrust bearing 33, and the thrust bearings 34 are arranged between the two worm gears. The housing half 28 has the two pins 35 and 36, as well as the electric motor 37, whose output pinion 37 'designed as a worm with worm wheel 31 is engaged. In the same way, the worm wheel 30 stands as a worm 38 'formed output pinion of the electric motor 38 in engagement, which is on the housing half 27 is attached.

This measure doubles the drive power.

According to this principle, the drive power could be tripled, quadrupled etc. will be. Two electric motors can also be provided for each worm wheel so that the drive power is increased even further with the same motors. In general, the design effort with regard to the arrangement of the electric motors on the case very high.

In order to eliminate these disadvantages, the arrangement according to FIG the modular principle. The housing 40 consists of several housing components 41, 42, ..., only two being shown for the sake of clarity. By the housing made up of the housing components is passed through a spindle 43, which penetrates all housing components. Every housing component shows a worm wheel 44 or 45, which is on the spindle in the same way as after Fig.1 and Fig.2 are arranged. Each housing component is in the corresponding one Way divided into two parts and consists either of two in the radial or in the axial direction assembled housing halves. The worm wheel 44 is between two needle bearings 46 and 47 and the worm wheel 45 are arranged between two needle bearings 48 and 49. The housing component 41 has an electric motor 50 and the housing component 42 an electric motor 51 to form a worm drive. Furthermore, a of the housing components pin, not shown, for pivoting the housing in the frame, not shown, or is attached to the front in a Hit the tube to accommodate the free spindle section.

Fig. 6 shows an embodiment for a handicapped elevator, which is also the design principle for an adjustable car seat.

The chassis frame of a known type is designated by 52, which has the castors 53 and 54. The castors 54 are known per se Manner driven by the accumulator drive unit 55, the controller in takes place in a known manner. The chassis frame has a column 56, in which the seat frame 57 is pivotably mounted in the direction of the double arrow.

In the area of the front edge, the chassis frame has a vertical, consisting of flat profiles upwards open U-shaped frame 58, in which the housing of a drive unit with its not numbered pin is pivotably mounted. The spindle of this drive unit is labeled 59 and with its upper end section 60 pivotably connected to the seat frame.

The inclination of the seat frame is adjusted by the spindle position. The column is also designed as an upwardly open U, with in the legs the drive unit 61 can be pivoted with its pin, which is also not numbered is stored. The backrest 62 is pivotable on the seat frame by means of the Hinge joints 63 articulated. The backrest has a flat profile Lever arm 64, at the free end of which the spindle 65 of the drive unit 61 is articulated is. On the back of the backrest, in the area of the head end, is a Spindle drive 66 arranged in a stationary manner. There is a drive unit on the lever arm 67 pivoted. Your spindle rod 68 forms with the spindle rod 69 of the Spindle drive 66 and the flat profile 70 a parallelogram guide for the headrest 71

There is also a drive unit on the front edge of the seat frame 72 pivotably mounted, the spindle 73 of which with one end portion on the the calf support 74 hinged to the seat frame is pivotably connected.

By appropriately actuating the drive units according to the invention can adjust the seat inclination, the height and inclination of the headrest and the inclination of the Calf support and thus also the footrest can be adjusted. Special Advantages result from the fact that the sick or disabled person these attitudes can make yourself and that a stepless setting is possible. Fig.6 shows at the same time the adjustment of the seat inclination and the setting according to the invention the headrest in car seats.

7 shows a schematic representation of an embodiment for a bed. The bed 75 has a frame 76 with bed feet 77. Head side and in the area of the feet, the frame has an articulated pivotable frame part 78 and 79 respectively. Between two flat profiles attached to the bed legs, only one of which is visible in each case and is denoted by 80 and 81, respectively a housing 82 or 83 with its not designated pin pivotable arranged. The associated spindle 84 or 85 is with its upper end portion pivotally mounted in the associated frame part.

By adjusting the spindles accordingly, the patient can Sensitively adjust the optimal position for him in each case, without him having to look to strangers Help is in need.

Fig. 8 shows an embodiment of a conversion kit for hospital beds. The sick bed is shown in the detail and has in a manner known per se on the frame 86 a pivotably arranged frame part 87 in the area of the head on. The frame part has a transverse profile 88 which has a U-shaped in its center Abutment 89 with a pivot pin. On the transverse profile 90 a holding frame 91 is pivotably mounted on the frame. It consists of the two Flat profiles 92 and 93. Their upper end sections comprise the transverse profile 90 according to Type of plain bearings and are each secured with a screw and nut 94 and 95, respectively. The two flat profiles 92 and 93 have a pivotable, Cross member 97 secured by nuts 96. On this is an inventive Drive 98 arranged, wherein the cross member has the function of the housing pin. The spindle 99 is passed through the housing and the cross member. she is pivotably mounted in the area of the upper end by the bolt 100 in the abutment. On this spindle section, the elastic protective sheath 101 is arranged, while the lower spindle section protrudes into the protective tube 102, which is on the crossbar 97 is attached. The electric drive is via a transformer, not shown powered by the mains or independent of the mains by a battery.

It is a wiper motor modified according to FIGS. 1 and 2, respectively for automobiles. The parking frame also has a protective function. If off for some reasons the pivotable frame is not further adjustable by for example the patient accidentally slipped his hand under the frame, pivots out when the drive is operated, the holding frame so that the Can't hurt the person concerned.

Fig. 9 shows a bed 105, the frame around its longitudinal axis and its The swiveling frame parts for the head end (Fig. 8) and the foot end (e.g. according to Fig. 8) are not shown for the sake of clarity. Below A support frame 1o6 that can be moved with the bed is arranged on the frame, the adjustment devices for example according to Fig.3. The spindles are on the underside of the frame parts 109 articulated The articulation can be seen from Fig.9a, which is a section of a Frame part 109 and a spindle, denoted by 108 and shown in the cutout is shows.

The articulation takes place through the ball joint pins 9a, which make the adjustment Allow lengthways and crossways.

Depending on the alignment of the ball joint bolts to the longitudinal direction of the frame, i.e. parallel or perpendicular to it, the bed can be adjusted by extending the adjustment devices be inclined transversely or parallel to the longitudinal direction. The adjustment devices so differently extended in pairs that the bed rolls on the relevant Side support yourself on the floor.

Fig. 10 shows the articulation of a swivel device for example 3 on a frame part of a bed according to the principle of the two-armed lever are the two side frame sections 1o5, of which only one is shown is, according to the principle of the two-armed Lever on the frame 106 of the The adjusting device is denoted by 107 and is for example Realized according to the design principle of FIG. 3. One end 108 of the spindle 107 is hinged to the leg of a frame section 105, while the other end protrudes into a tube 109 which is guided telescopically in an outer tube 110. These outer tube is hinged to frame 106 in the manner shown Lowering the frame part 105 blocks the circular arc-shaped movement at once, by, for example, the patient accidentally tucking his arm under the frame part, then the tube 109 extends telescopically so that injury is not possible inner tube has a longitudinal slot, not numbered, in which a bolt 111 is performed so that the two tubes form a captive unit.

13 shows a section of a bed 112 with a pivotable one Frame part 113, which also has two lateral sections 314, which on the bed are hinged and only one of them is visible on one or both of them a linkage 115,116 articulated, the profile 116 with one end on the bed and its other end to the spindle 117 of a drive unit 117 (for example The housing of this drive unit is on a tube 119 attached, which is guided telescopically in the tube 120. This tube 120 is hinged to the frame of the bed. The outer tube points to the immersion side a ram bearing 122 for the inner tube. Approximately in the middle of the profile 116 is is the second profile 115 of the linkage articulated, which on the principle of one-armed Lever is hinged to the section 114. When properly pivoting the Frame part 114, the inner tube 119 is supported on the abutment If a blockage occurs when the frame file is swiveled downwards, the inner tube moves into the outer one, so that the risk of injury is avoided.

The linkage can also be attached to a cross profile on the underside of the Be hinged frame part.

In one embodiment, FIG. 12 shows a further example in which the the housing of the swivel unit is arranged on a tube 123, the other of which End is pivotably arranged on the frame of the bed. The spindle inst with a Eette / ti4 coupled, which is attached to a roller 125 with the other end The role is connected to the pivoting frame part 125 and does it Pivoting movements with. The particular advantage is that the pivotable The frame part automatically resumes its old position after being lifted by hand can.

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Claims (1)

Seat and / or die device, in particular bed for the sick and / or Disabled, with at least one pivotable frame part hinged to a frame PatenSsansPriiche rs Sitting and / or lying device, especially bed for the sick and / or disabled persons, with at least one pivotable one hinged to a frame Frame part, characterized in that a spindle (5, 19) with its one end section (72) hinged to the frame part (74) so as to be pivotable and in a housing (2, 3) is arranged axially adjustable, the housing has at least one electric drive (-) for adjusting the spindle and arranged pivotably on (in) the frame is. 2.) Sitting and / or lying device according to claim 1, characterized in that that in the housing the worm wheel (4) one Worm drive is arranged, the worm wheel has an axial bore (-) with an internal thread, the worm wheel can be rotated on the spindle passed through the housing is arranged and with the output pinion designed as a worm at least an electric drive arranged on the housing is in engagement. 3.) Sitting and / or lying device according to claim 2, characterized in that that the housing is divided into two parts in the radial direction and the housing halves (17s18 ) form thrust bearings (15, 25) with the end faces of the worm wheel. 4.) sitting and / or lying device according to claim 2, characterized in that that between the housing halves and the faces of the worm wheel needle bearings (32,33,34) are arranged. 5.) Sitting and / or lying device according to one of claims 1 to 4, characterized in that the housing or the housing halves guide sleeves (12, 13) has or have. 6.) Sitting and / or lying device according to claim 1, characterized. that in the housing (44, 45) two worm gears of Worm gears are arranged, the worm gears each have a coaxial bore with an internal thread have and are arranged on the spindle passed through the housing and each with an output pinion designed as a worm on the housing arranged electric motors are in engagement. 7.) Sitting and / or lying device according to claim 1, characterized gekennzeichnat, that the housing of at least two assembled on the modular principle Housing components each with an electric drive for adjusting the common Spindle exists. 8.) Sitting and / or lying device according to one of claims 1 to 7, characterized in that one end section of the spindle has a bore ( -) for a pivot pin (89, 100) arranged on the frame part. 9.) Sitting and / or lying device according to one of claims 1 to 8, characterized in that the housing has two lateral pins (8,9,23'24) ' which are pivotably mounted in (on) the frame. 10.) Sitting and / or lying device according to one of claims 1 to 9, characterized in that the housing can be swiveled in a holding frame (86, 87) is mounted and the holding frame is pivotably connected to the frame. 11.) sitting and / or lying device according to claim 10, characterized in that that the housing and the holding frame a kit for retrofitting a known per se Sitting and / or lying device are. 12.) Sitting and / or lying device according to one of claims 1 to 11, characterized. that the housing has an elastic bellows (101) for has one end portion of the spindle. 13.) Sitting and / or lying device according to one of claims 1 to 12, characterized in that the housing has a protective cover (104 for the other Has end portion of the spindle. 14.) Sitting and / or lying device according to one of claims 1 to 13, characterized in that the electric drives are windshield wiper motors for electric vehicles with an output shaft designed as a worm. 15.) Sitting and / or lying device according to one of claims 1 to 14, characterized in that for pivoting the frame in the longitudinal and / or Transverse direction of the frame on its underside at least one articulated spindle has, the spindle is guided axially adjustable in a housing, in the housing the worm wheel of a worm drive is arranged, the worm wheel an axial Has internal thread bore, the worm gear on the passed through the housing Spindle is arranged rotatably and with the output pinion designed as a worm at least one electric drive arranged on (on) the housing in engagement stands. 16.) Sitting and / or lying device according to one of claims 1 to 14, characterized in that the spindles work on the principle of the two-armed lever are articulated on the pivotable frame part. 17.) Sitting and / or lying device according to one of claims 1 to 15, characterized in that the pivotable frame part is coaxial with his Swivel axis has a roller and the roller via a chain (an elastic Tape) is connected to the roll, 18.) Sitting and / or lying device according to one of claims 1 to 14, characterized in that the spindle over a linkage (108 on the pivotable frame part based on the principle of the one-armed Lever are hinged. 19.) Sitting and / or lying device according to one of claims 16 to 19, characterized by tube sections (109, 110) guided telescopically into one another, wherein the outer tube section is hinged to the frame and the inner, guided Tube section has the housing with the spindle and the worm drive and the outer pipe section stops for the two end positions of the inner pipe section Has.