EP1462409B1 - Lifting platform with Bowden cable - Google Patents

Abstract

The elevating platform has a lifting plate (3) for the lifting of loads, and a Bowden cable (20) with an inner cable (21) and an outer conduit (25). The outer conduit is fastened by its first end (26) to the lifting plate, and the inner cable by its first end (22) to a fixed point. The elevating platform also has a drive to exert an extension force on the inner cable and/or to exert a compressive force on the outer conduit in order to raise the lifting plate. The second end (27) of the outer conduit is fastened to a fixed point. An independent claim is included for a passenger lift with the proposed elevating platform.

Description

Such lifting devices are known in numerous embodiments. For example, DE-A-43 42 373 describes a lifting device with a platform and a side of the platform arranged support unit. The platform is connected via a tension belt with the support unit, wherein the tension belt is guided over a height-adjustable deflection roller. By the Move the pulley, a tensile force is exerted on the tension belt, so that the platform is raised.

Such lifts are used in particular as a transportable means for Overcoming smaller height differences of up to 1 m in height.

From CH-A-664 549 a lifting device for a bed frame is known which corresponds to the closest prior art, With a carrier, wherein the lifting device comprises a Bowden cable with a soul and a jacket, and wherein the lifting device further comprises drive means for exerting a tensile force on the soul to lift the carrier. Upon actuation of the lifting device, the carrier is not only vertical, but also moved horizontally.

Object of the present invention was to provide a further lift for Specify lifting of loads. The lift should be as simple as possible It should be easy to maintain, if possible it should be portable, easy to use and safe in operation.

To solve the problem according to the invention a lift with a Lifting plate specified for lifting loads, which is characterized is that she has a bowden cable with a soul and a coat comprising, wherein the jacket with a first end on the lifting plate and the Soul is attached to a fixed point with a first end and where the Lift further drive means for exerting a tensile force on the soul and / or for exerting a compressive force on the jacket to which the Lift lifting plate. The first end of the soul is preferably in attached directly to the highest point on which the lifting plate should be raised.

In the context of the present invention is under a lifting plate a any device element for receiving a good to be lifted Understood. A lifting plate may in particular a metal, plastic and / or Wood panel or be combined from the materials mentioned. The Lifting plate may also include a reinforcing frame or a frame.

A Bowden cable according to the invention is any device with a flexible, zugbelastbaren soul and the soul enveloping, also flexible Coat that is pressure resistant to compressive forces acting on its opposite Ends work. Preferably, the invention used Bowden cable a conventional Bowden cable and owns a metal Sheath and a slidably disposed in the jacket (possibly multi-core) Wire as a soul.

By providing one or more Bowden cables for lifting the Lifting plate makes it possible to have a lift without a noticeable lateral Support unit or large height-adjustable elements like in DE-A-43 42 373. Likewise, according to the invention on the Use of large-sized, to be arranged under the lifting platform Lifting means such as scissors are dispensed with. The inventive Overall, the device can therefore be made very inconspicuous It is easy to set up and all parts susceptible to wear can be easily removed being repaired. The lift can in particular to overcome Height differences of up to 30 cm, preferably up to 50 cm or even be set up to 1 m. The use of Bowden cables allows In addition, the construction of lifts with a lift height of less than 10 cm, preferably less than 5 cm, particularly preferably not more than 3.5 cm.

For lifting a load with the lift according to the invention can for a pressure force is exerted on the jacket of the Bowden cable, For example, by at a fixed at both ends soul of the mantle with its second end opposite the first end in the direction of first and thus pressed in the direction of the lifting plate. The soul prevents a lateral breaking of the jacket, so that the Lifting plate raised by transferring the compressive force through the jacket becomes.

At the same time or alternatively, it can also be a pulling force on the soul be exercised, the jacket having a second end in one Fixed point is attached. Here, such embodiments are the Lift according to the invention preferably, in which coat and soul of the Bowden cable in the non-raised state of the lifting plate in Essentially do not extend in lifting direction, but at least one of the lifting direction angled section comprising more than a quarter, preferably more than half of the Bowden cable makes. By the Exerting the traction on the soul becomes a section of the soul from the Cloak pulled out, namely through the second end of the mantle, so that As a result, the length of the between the second end of the soul and the second end of the mantle exposed, not by the mantle surrounding soul is increased by the pulled-out section.

When exerting the traction on the soul this is streamlined. Since the coat but retains its length and also with its second end in one Fixed point is fixed, as a result, attached to the lifting plate first end of the coat and with it the lifting plate along the itself exciting soul in lift direction upwards. In this type of Lifting loads is therefore only indirectly a compressive force on the jacket exercised.

Applying traction to the soul and compressive force on the mantle can also be done in combination by both the second end of the Mantels (direct) applied with a compressive force and the second end the soul is subjected to a tensile force.

In preferred embodiments of the invention, the drive means comprise a pulley for winding the soul. This way, the soul can be with a small-sized drive means subjected to the necessary tensile force become. The pulley winds while raising the lifting plate one Section of the soul on, leaving this section of the soul as above described is pulled out of the jacket.

In particularly preferred embodiments of the lifting platform according to the invention becomes the soul between its second end and the second end of the jacket over a pulley. It is in particular preferred when the drive means are arranged to move the Pulley to pull a section of the soul out of the mantle. The Traction exerted by the drive means becomes in these embodiments transferred to the soul through the pulley. In such invention Embodiments may be achieved by moving the diverting pulley Section of the soul pulled out of the mantle through the second end be the length of this section a multiple (preferably twice) of the path around which the pulley is moved. In particularly preferred embodiments, the soul is so over the Guide pulley that they are at an angle of 100 ° -260 °, preferably 160 ° -180 ° and in particular preferably deflected by 180 °. At a Deflection angle of 160 ° -180 ° and in particular at a deflection angle of 180 ° is the length of the section of the soul that comes out of the mantle at Move the pulley is pulled out, about twice the length the path around which the pulley is moved. By use a pulley can therefore a large space in a particularly small space Lifting height of the lift according to the invention can be achieved.

The use of a pulley, in particular while maintaining a Deflection angle of 160 ° -180 ° (in particular of 180 °), is in particular for Such lifts preferably according to the invention, with which a lifting plate (without limiting means, see above) by more than 30 cm, preferably around at least 50 cm to 1 m, more preferably by up to 60 cm liftable should be. Despite the height difference that can be overcome with such lifting platforms the drive means can be sized small and save space. This advantage is especially true when using a pull rod Wear, more on that below.

Also preferred are embodiments in which the drive means a powered drawbar to make up a section of the soul to pull the coat. Corresponding driven tie rods are in the Commercially available, they are compact, reliable and comparatively inexpensive, so that these benefits of the lift according to the invention get. By interacting with one or more Bowden cables will allow the drawbar to lift the Lifting plate not in the direction of the lifting movement, but preferably to to move a plane transverse to the lifting direction. The inventive Hydraulic lift is therefore in such a preferred embodiment without the otherwise necessary vertical facilities. The drawbar can in particular by an electric motor, hydraulic or pneumatic are driven. It is particularly preferred, the pull rod through drive an electric motor, since such motors are readily available, need little space and work quietly.

In one embodiment of a lift according to the invention, the second End of the soul on the tie rod directly or via an adapter means attached. This especially makes it possible to synchronize several Bowden cables to press. For this purpose, the souls of the Bowden cables via fastening means, For example, a mounting plate, connected to the pull rod become. By pressing the pull rod is synchronously on all at her attached to pulled souls a pulling force. This allows for a special smooth running of the lift according to the invention.

In a further embodiment of the lifting platform according to the invention is Tie rod connected to the pulley, through which the soul is deflected. If the lift with more than one Bowden cable for lifting the Lifting plate is equipped, so it is preferable if all souls of this Bowden cables are guided via corresponding assigned deflection rollers, which are connected via an axle with the drawbar. this makes possible also a particularly smooth running of the invention Lift.

Particularly preferably, the pull rod is guided in a guide.

Furthermore, it is preferred if the drive means support spring means exerting the traction on the soul and / or exercising the Include compressive force on the jacket. The spring means can in particular Tension or compression springs, gas springs are particularly preferred. at Use of a pulley for winding the soul, the spring means in particular one or more coil springs or helical be spiral bending springs, which act on the pulley to lift to support the lifting plate. When using a pull rod for Pulling a section of the soul out of the coat is special preferred when the spring means comprise a tension and / or compression spring, the at the second end of the soul (possibly via the adapter means, in particular via the attachment plate) and / or on the deflection roller or whose axis is fixed. In a particularly preferred embodiment the soul is deflected by a movable pulley by 180 °, wherein on the axis on both sides of the deflection roller per a gas spring with a first End is attached, and the second end of each of the two gas springs attached to a fixed point. When moving the pulley to exercise a tensile force on the soul (ie for lifting the lifting plate) are the Gas springs relaxed, so that the gas springs exerting the traction support. When moving the pulley in the reverse direction (ie to lower the lifting plate), the gas springs are again stretched. When using several Bowden cables and multiple pulleys for Lifting the lifting plate, it is preferable if all pulleys on a common axis are arranged, at both ends of each one first end of a spring means of one of the types described above (In particular a gas spring) is attached. Instead of gas springs can also other tension and / or compression springs are used, in particular Screw tension and / or pressure springs. Gas springs have, however, as particularly advantageous. The use of spring means in the Drive means makes it possible in particular to exert the tensile force on the Soul and / or exerting the compressive force to support the coat. As a result, the lifting of the lifting plate can be facilitated, for example to balance an average expected weight to be lifted.

In addition, it is preferred if the drive means securing means comprise the drive means in a tearing of the soul and / or a Dismantle the destruction of the coat. Due to the securing means, the Operational safety of the lift according to the invention can be increased by the drive means in case of damage and / or destruction of a Lifting plate moving Bowden cable are shut down. An unintentional Commissioning a by damage or destruction of a Bowden cable unsafe lift can be avoided.

In preferred embodiments, the securing means comprise a Spring means to bias the second end of the soul, and one with the second end of the soul and cooperating with the drive means Switch to shut down the drive means when the spring means over selected safety measure is relaxed. A relaxing of the Federmittels on the preselected safety measure occurs only on if the soul breaks. In this case, the switch is actuated, the switch acts on the drive means to shut them down, preferably by Interrupting a power supply of the drive means. Preferably that is Spring means a compression spring to the second end of the soul in the direction of a Switch to press, the switch is a power supply of the Drive means interrupts when the switch passes through the second end of the soul pressed under the influence of the pressure exerted by the compression spring becomes.

In particularly preferred embodiments of the lifting platform according to the invention At the first end of the mantle is a guide to guiding the Lifting plate assigned. The guide allows the lifting plate against Stabilize movements across the lifting direction. In addition, the facilitates Lead the attaching of the first end of the soul. The guide is in preferred embodiments of the lift according to the invention a Guide column.

In this case, it is further preferred if the guide has a limiting means includes lifting the lift plate to a maximum lift height limit. In particular, it is preferred if the limiting means to or in the leadership and / or the soul at a preselected place can be fixed. In a particularly preferred embodiment, this is Limiting means a clamping screw, which is inserted into the guide and is fixed in it and / or on the soul. The limiting means allowed on Advantageously, lifting the lifting plate to a height below the limit the maximum height to which the lifting plate otherwise could be raised. By using a limiting means Therefore, the lifting plate when lifting against the limiting means be pressed. In this way, the lifting plate is prevented in the raised state slightly increases during discharge or under load something sagged. It is useful when the drive means a Comprise switching means to terminate the lifting of the lifting plate when the lifting plate has reached the limit means and with a preselected Strength is pressed against the limiting means. Such a switching means the drive means may preferably comprise a current limiting.

Preferably, the guide has a first opening for engaging Holding means of the lifting plate and a second opening for the passage of the Bowden cable. In particular, it is preferred if the guide in shape a guide column with two lateral recesses, for example in the Form of longitudinal slots or slots is formed. By the Holding means of the lifting plate through the one recess and the jacket of the Bowden cable through the other recess in the guide column Can extend, damage to the Bowden cable through the Holding means can be prevented in an advantageously simple manner.

In addition, a lift is preferred whose leadership a Guide surface and the lifting plate has a hinged Auffahrplatte having a pivot lever, wherein the pivot lever and the guide surface interact to bring the Auffahrplatte from a rest position into a to swing from this angled securing position when the Holding plate is moved. Movable ramps are especially at Lifting platforms for wheelchairs known. They allow the lifting plate to pass through Reaching up easy to reach and secure at the same time against unintentional Roll down when the lifting plate has been moved in the lifting direction. Due to the inventive cooperation of a pivot lever and a guide surface can be a particularly simple and robust control the pivoting behavior of the Auffahrplatte in the operation of the invention Lifting platform can be achieved. In this case, the guide surface in particular be arranged on a projection mounted on the guide. Also is it is possible, the pivot lever in a guide groove with two guide surfaces respectively.

In addition, a lift of the type according to the invention is preferred, the is transportable. For example, the lift on a base frame or a base plate be constructed by guide columns on Base frame or the base plate are fastened, wherein at each guide column a first end of a Bowden cable soul is attached. To exercise the Pulling force on the souls and / or exerting a compressive force on the Sheath, the drive means can also be attached to the base frame become. The lift can then be moved using the base frame become. It is preferred if the weight of the lift (including a possibly existing basic framework and / or one possibly existing base plate) is less than 100 kg. Preferably the weight of the lift is up to 92 kg, more preferably up to 90 kg, if the lift (without limitation means, see above) is set up, to lift the lifting plate up to 60 cm, and preferably up to 72 kg, more preferably up to 70 kg, when the lift (without Limiter, s.o.) is set up to lift the lifting plate to to 30 cm.

Conveniently, the drive means, such as a motor, a Pulley, a pull rod and / or one or all pulleys, the side of the Lifting plate arranged on the base frame or on the base plate, wherein a possibly existing drawbar a movement preferably substantially in a plane parallel to the base plate or to the base frame performs to raise the lifting plate. In this way, the lifting plate be traveled by the other pages. For example, rectangular or square base plate can thus be drivable from three sides. Appropriately, at each corner of the base plate is a guide column arranged.

The lift according to the invention is in preferred embodiments designed to lift loads weighing up to 250 kg, preferably up to 200 kg. In this case, such embodiments according to the invention, with which loads of at least 50 kg, more preferably at least 70 kg and more preferably loads from at least 70 kg to 200 kg as described above with the lifting plate can be raised, preferably by at least 30 cm and more preferably up to 60 cm. Particularly good embodiments such lifting platforms according to the invention have at least four Guides as described above, preferably each in the form of a Guide column. The guides are each a Bowden cable as above assigned so that the first end of the soul of each of the Bowden cables on in the stroke direction upper end of the associated guide column attached and the respective first end of the associated jacket on the Lifting plate (if necessary, by means of fasteners) is attached. On in this way, the load to be lifted is distributed over several Bowden cables, making the individual Bowden cables smaller than when using a smaller number of Bowden cables can be selected. In addition, the Operational safety increases, since when a Bowden cable soul tearing the Lifting plate no longer as when using only a Bowden cable can crash.

Finally, a passenger elevator with one is particularly preferred Lift according to the invention according to one of the previously described Embodiments. Such a passenger elevator is easy to manufacture, inconspicuous, space-saving, robust, easy to maintain and possibly also transportable.

Fig. 1

eine Prinzipskizze einer Ausführungsform einer erfindungsgemäßen Hebebühne;

Fig. 2

einen Ausschnitt einer Seitenansicht auf eine erfindungsgemäße Hebebühne,

Fig. 3

einen Ausschnitt einer weiteren Seitenansicht auf die Hebebühne gemäß Fig. 2,

Fig. 4

eine weitere Prinzipskizze in Seitenansicht von Antriebsmitteln einer erfindungsgemäßen Hebebühne,

Fig. 5

eine Aufsicht auf die Antriebsmittel gemäß Fig. 4,

Fig. 6

eine Ansicht erfindungsgemäßer Begrenzungsmittel, und

Fig. 7

eine schematische Ansicht erfindungsgemäßer Sicherungsmittel.

The invention will be explained below with reference to preferred embodiments and the figures. They show:

Fig. 1

a schematic diagram of an embodiment of a lift according to the invention;

Fig. 2

a detail of a side view of a lift according to the invention,

Fig. 3

a detail of another side view of the lift according to FIG. 2,

Fig. 4

a further schematic diagram in side view of drive means of a lift according to the invention,

Fig. 5

a plan view of the drive means of FIG. 4,

Fig. 6

a view of limiting means according to the invention, and

Fig. 7

a schematic view of inventive securing means.

The lifting platform according to the invention shown in Fig. 1 has a base frame (not shown in Fig. 1), to which a mounting plate 11 and a Motor 12 are attached. The motor 12 is operatively connected to a Pull rod 14. At the drawbar 14 are over another mounting plate second ends 23 of two Bowden cable souls 21 attached. The first ends 22 the Bowden cable souls 21 are each attached to a fixed point. The Bowden cable souls 21 are each provided with a Bowden cable jacket 25 to Surrounding formation of Bowden cables 20. The first end 26 of the Bowden cable coats 25 is attached to a lifting plate 30, the second end 27 of the coats 25 is attached to the mounting plate 11, respectively. The Bowden cable coats 25 do not extend between their two ends 26 and 27 in a straight Line, but are angled. The same applies accordingly to the souls 21.

To operate the lift according to the invention, the motor 12 is in operation set so that the drawbar 14 the distance between the second ends 23 of the cores 21 and the second ends 27 of the coats 25 increases. The Bowden cables 20 are thereby tightened. Since the length of the coats 25 remains unchanged, the lifting plate 30 is in the direction of the first end 22nd Bowden cable souls 21 raised (in the direction of the arrow). To lower will the drawbar 14 retracted so that the distance between the second Ends 23 of the cores 21 and the second ends 27 of the sheaths 25 are reduced is so that the lifting plate 30 is lowered (opposite to the arrow). The drive means shown in Fig. 1 are particularly suitable to the Lifting plate 30 to raise up to 30 cm.

In Fig. 2 is a detail of a side view of an inventive Lifting platform shown. The lift has drive means such as For example, in Fig. 1 or Fig. 4, 5 shown. The lift has Further, a base frame 10, on which a guide column 40 is attached. Through a lateral recess 42 of the guide column 40 is sufficient Bowden cable 20 into the interior of the guide column 40. The soul 21 is at her first end 22 on the end remote from the base frame 10 of the Guide column 40 attached. The first end 26 of the shell 25 is at a the guide column 40 movably mounted lifting plate 30 is attached. The Lifting plate 30 has a reinforcing frame arranged on its underside and is held by holding means 32 on the guide column 40. The Holding means 32 engage through a further lateral recess (see Fig. 3) in the guide column 40 for securing the lifting plate 30 against lateral Move one. If the jacket 25 is acted upon by a compressive force and / or a tensile force is applied to the core 21, the lifting plate 30 becomes pushed along the guide column 40 from the base frame 10 and raised. If the tensile force exerted on the core 21 is reduced and / or reduces the pressure exerted on the jacket 25 compressive force, so the lifting plate decreases 30 along the guide column 40 in the direction of the base frame 10 from.

In Fig. 3 is a further detail of a side view of the invention Lifting of Fig. 2 shown. On the base frame 10 is in turn attached to a guide column 40, at the base of the frame 10th opposite end a first end 22 of a soul 21 of a Bowden cable 20th is attached. The jacket 25 of the Bowden cable 20 is at its first end 26th attached to a lifting plate 30. The lifting plate 30 is by holding means 32nd (partially hidden), in a second recess 43 of the guide column 40th intervene, guided. The guide column 40 also has a laterally from the Guide column 40 outstanding guide 45 with an angled Guide surface 46. The lifting plate 30 is connected via a hinge 34 with a Auffahrplatte 35 hinged. The Auffahrplatte 35 has a Pivoting lever 36, which on the guide surface 46 of the guide gauge 45th along slides. The guide surface 46 is at its base frame end angled in the direction of the guide column 40.

In the initial state, the lifting plate 30 of the invention Lift on the ground and lies with its reinforcing frame on the Base frame 10 on. The pivot lever 36 is in the direction of Guide column 40 is pressed in at point 47. The Auffahrplatte 35 is then relative to the lifting plate 30 in the direction of the base frame 10th angled and forms a Auffahrrampe, which the ascending on the Lifting plate relieved. When lifting the lifting plate 30 by exercising a Traction on the soul 21 and / or a compressive force on the jacket 25 is the Lifting plate 30 raised. In this case, the pivot lever 36 slides on the Guide surface 46 of the guide gauge 45 along and is of the Guide column 40 pushed away. As a result, the Auffahrplatte to the Hinge 34 is rotated so that it faces away from the base frame 10 and a lateral protection against unintentional unrolling of the lifting plate 30th forms.

Between two guide columns 40, the lift with a panel be provided to prevent the accidental insertion of objects under the Lifting plate 30 to prevent. Conveniently, the fairing so be rigid. If the panel is rigid, then it will be preferred attached only to those sides of the lift which are not to be driven over, for example, by a wheelchair, are thought. In particular, the Side of the lift on which the ramp is located, without one stay rigid panel.

Fig. 4 shows a fragmentary drive means of a lift according to the invention. The drive means according to FIG. 4 are particularly suitable for lifting a lifting plate by more than 30 cm, in particular by 50 to 60 cm. The Drive means comprise, in addition to the pull rod 14 already described above together with the associated motor 12, a guide roller 16 to which the soul 21 of a Bowden cable 20 is deflected by 180 °. The second end 23 of the soul 21st is attached to a fastening device, at which also the second end 27 of the jacket 25 of the Bowden cable 20 is attached. the fastening device is not movable relative to the engine. The pull rod 14 is connected to the guide roller 16 and can this from the fastening device move away and vice versa again towards the Move the attachment (arrows). For lifting the lifting plate (not shown), the pull rod 14 is actuated. The from the drawbar exerted tensile force is doing by the guide roller 16 on the soul 21st transfer. By moving the guide roller 16 under the action of Pulling rod 14, a portion of the soul 21 from the jacket 25 through whose second end 27 is pulled out, the length of this section is about twice the distance by which the guide roller 16 moves becomes. For example, to raise the lifting plate by 60 cm, the Deflection pulley 16 by the tie rod 14 by 30 cm from the second end 23 of Soul 21 pulled away (arrows).

In Fig. 5, the drive means shown in Fig. 4 are again schematically shown in a plan. FIG. 5 shows that the Lift has four Bowden cables 20 with 21 souls and 25 coats. The Souls 21 are deflected by pulleys 16 by 180 °. In the here shown supervision come the second ends 23 and 27 of the souls 21st and the respective associated coats 25 to lie over each other and can therefore not shown separately.

The deflection rollers 16 are arranged on an axis 17 which on the Tie rod 14 is attached. The drawbar 14 is driven by the engine 12. At both ends of the axis 17 is in each case a first end of a spring plunger 19 a gas spring 18 attached. The gas springs 18 are at their second end each attached to the fastening device, on which also the second Ends 23, 27 of the Bowden cables 20 are attached. The gas springs bow a deflection of the axis 17 under the transmitted from the souls 21 Burden.

The drive means further comprises a guide 15 with a guide rod and a guide carriage. The axle 17 slides with the guide carriage in the guide rod of the guide 15 and is so against movement secured transversely to the main direction of movement of the drawbar 14.

To lift the lifting plate (not shown), the pull rod 14 through the engine 12 extended and thereby pulls the axis 17 with the pulleys 16 away from the second ends 23, 27 of the cores 21 and the coats 25. The Axis 17 slides with the guide carriage in the guide rod of the Guide 15. By the movement of the guide rollers 16, a portion of Souls 21 from the jackets 25 through their respective second ends 27 pulled out. The length of this section is about twice the Way by which the pulleys 16 are moved. The extension of the Pull rod 14 is supported by the gas springs 18, 19. The gas springs 18, 19 are relaxed and press with their spring tappets 19, the axis 17 in the main direction of movement of the drawbar 14th

The lift with drive means shown in FIG. 4, 5 may otherwise as in Fig. 2, 3, 6 and / or 7 be configured and according to a base frame and four guide columns 40, a guide gauge 45 and a ramp plate 35 with pivot lever 36, limiting means 50 and securing means including a spring 121, a receptacle 123 and a switch with Positions 124, 124 ', 112, 112' include.

To lower the lifting plate (not shown), the pull rod 14 through the motor 12 retracted, so that the axis 17 with the guide rollers 16 in Direction to the second ends 23, 27 of the cores 21 and coats 25 moves becomes. In this case, the free section of the souls 21 between the second Ends 23 of the cores 21 and the associated shells 27 shortened (by about twice the distance traveled by the drawbar). At the same time, the gas springs 18 via the spring plunger 19th curious; excited.

Fig. 6 shows a view of a limiting means of a lift according to one of the previous figures. The first end 26 of a jacket 25 is at one Lifting plate via an attachment (not shown, see Fig. 2, 3) attached. The first end 22 of the associated core 21 is at one end fixed to a guide column 40, as described above for Fig. 2, 3. To the Soul 21 is a fastening means in the form of a clamping screw 50 arranged. The clamping screw 50 is at the soul 21 at a distance attached by the first end 21 to the lifting of the lifting plate on a limit maximum lifting height. When lifting the lifting plate is the Attachment of the first end 26 of the shell 25 against in the direction of the first end 22 of the core 21 moves until the clamping screw 50 reaches is. The clamping screw 50 prevents further movement of the attachment the first end 26 of the shell 25 and thus a further lifting the Lifting plate. Because of the force exerted on the jacket 25 compressive force and / or because of the force exerted on the soul 21 tensile force is the lifting plate on the Attachment of the first end 26 of the jacket 25 against the clamping screw 50 pressed. One with the drive means (not shown, see For example, Fig. 1, 4 and 5) controlling connected current limit stops when a preselected pressure on the clamping screw is reached 50 further exerting a tensile force on the soul 21 and / or one Pressing force on the jacket 25, so that the lifting plate against the Clamping screw 50 remains depressed, without this from its preselected Tear fastening position. By pressing the lifting plate against the Clamping screw 50 prevents the lifting plate from being lifted Condition jumps up slightly on discharge or something under load sags.

In Fig. 7 are schematically securing means of an inventive Lifting platform according to one of the preceding figures, shown to drive means shut down at a tearing of a soul. The soul 21 is with its second End 23 attached in a receptacle 123. the receptacle 123 is replaced by a Compression spring 121 with a pressure force in the direction of the second end 23rd applied. In a normal operation of the lift is the second end 23 under the action of the drive means - in particular one Pull rod 14 and possibly an associated deflection roller 16 - slightly moved against the direction of the spring force of the spring 121 when the Lifting plate (not shown) of the lift is raised, or slightly up to a preselected level of safety in the direction of Spring force of the spring 121 moves when the lift plate is lowered and the tensile force is reduced. However, if the soul 21 breaks, then the Recording 123 under the action of the spring force of the spring 121 on the Selective Sicherheitsmaß out in the direction of the second end 23 of the Soul 21 moves. The receptacle 123 actuates a switch by moves him from position 124 to position 124 '. By pressing the Switch becomes an electrical contact from a closed position 112 moved to an open position 112 '. By opening the electrical Contact (position 112 '), a power supply 110 is disconnected so that no Power can flow through the current guide 110. The current guide 110 serves the power supply of the motor 5 (not shown) of the drive means. By opening the contact (position 112 ') we the engine 5 of the Power supply disconnected and thus shut down. The lifting plate 30 thus becomes not further raised or lowered, but arrested in the result. The Lift is then against use in a by tearing the Soul 21 caused unsafe condition protected.

To restart the lifting device, the soul 21st replaced. The second end 23 of the new soul 21 is in the recording 123 attached while the first end 22 of the soul 21, for example, on upper end of a guide post 40 (see, e.g., Figures 2, 3, 6). In this case, the core 21 is biased against the spring force of the spring 121, so that the switch from the position 124 'brought back to the position 124 becomes. In this position, the electrical contact is closed (position 112), so that by the current guide 110, the motor 5 again with a Power is connected. The lift can then be used again Lifting or lowering the lifting plate 30 are operated.

Claims (10)

1. A lifting platform having a lifting plate (30) for raising loads, wherein the lifting platform has a Bowden cable (20) with a core (21) and a sheath (25), and wherein the lifting platform also has drive means for exerting a tensile force on the core (21), characterised in that the sheath (25) is attached with a first end (26) to the lifting plate (30), and the core (21) is attached with a first end (22) to a fixed point, and wherein the drive means are additionally or alternatively equipped for exerting a compressive force on the sheath (25) in order to raise the lifting plate (30).
2. A lifting platform according to Claim 1, characterised in that the drive means are equipped for exerting a tensile force on the core (21), and the sheath (25) is attached with a second end (27) at a fixed point.
3. A lifting platform according to Claim 2, characterised in that the core (21) is guided between its second end (23) and a second end (27) of the sheath (25) over a deflection pulley (16).
4. A lifting platform according to Claim 3, characterised in that the drive means are equipped to move the deflection pulley (16) for the purpose of drawing a portion of the core (21) out of the sheath (25).
5. A lifting platform according to any one of Claims 2 to 4, characterised in that the drive means comprise a driven connecting rod (14) which co-operates with the core (21) for the purpose of drawing a portion of the core (21) out of the sheath (25).
6. A lifting platform according to any one of the preceding claims, characterised in that the drive means comprise spring means (18, 19) for supporting the exertion of the tensile force on the core (21) and/or for supporting the exertion of the compressive force on the sheath (25).
7. A lifting platform according to any one of the preceding claims, characterised in that the drive means comprise, as a security means, a spring means (121) for pretensioning the second end (23) of the core (21) and a switch (123, 124, 112) which co-operates with the second end (23) of the core (21) and with the drive means for the purpose of shutting down the drive means when the load on the spring means (121) is reduced beyond a pre-selected safety limit.
8. A lifting platform according to any one of the preceding claims, characterised in that a guide member (40) is associated with the first end (26) of the sheath (25) for the purpose of guiding the lifting plate (30).
9. A lifting platform according to Claim 8, characterised in that the guide member (40) comprises limiting means (50) for the purpose of limiting raising of the lifting plate (30) to a maximum lifting height.
10. A passenger lift having a lifting platform according to any one of the preceding claims.

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