EP0505847B1 - Lifting device - Google Patents

Lifting device Download PDF

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Publication number
EP0505847B1
EP0505847B1 EP92104351A EP92104351A EP0505847B1 EP 0505847 B1 EP0505847 B1 EP 0505847B1 EP 92104351 A EP92104351 A EP 92104351A EP 92104351 A EP92104351 A EP 92104351A EP 0505847 B1 EP0505847 B1 EP 0505847B1
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EP
European Patent Office
Prior art keywords
lifting device
low
lifting
voltage
scissor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP92104351A
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German (de)
French (fr)
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EP0505847A1 (en
Inventor
Eckhart Dipl.-Ing. Dewert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dewert Antriebs und Systemtechnik GmbH and Co KG
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Dewert Antriebs und Systemtechnik GmbH and Co KG
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Publication of EP0505847A1 publication Critical patent/EP0505847A1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
    • A47C31/008—Use of remote controls
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C20/00—Head -, foot -, or like rests for beds, sofas or the like
    • A47C20/04—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination
    • A47C20/041—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination by electric motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065—Scissor linkages, i.e. X-configuration

Definitions

  • the present invention relates to a lifting device for pivotable furniture parts of a piece of furniture which has lifting scissors which can be actuated by a motor by means of a fixed threaded spindle.
  • the stationary threaded spindle is rotated by a motor, which is not described in detail.
  • the threaded spindle is provided with opposing threads, so that the attached nuts are moved apart or together depending on the direction of rotation of the threaded spindle.
  • the ends of two scissor arms are hinged to the nuts.
  • the disadvantage of this lifting device is that the threaded spindle is rotated, which increases the risk of accidents.
  • it is extremely complex, due to the opposite threads.
  • retrofitting into existing furniture is extremely problematic.
  • the present invention has for its object to provide a lifting device with which furniture equipped with pivotable furniture parts can be retrofitted, it should also be easy to use and the furniture part to be pivoted should be able to be pivoted back into the extended position from any angular position.
  • the motor is a low-voltage direct-current geared motor, the output member of which is designed as a rotationally drivable internal threaded nut, so that the low-voltage direct-current geared motor can be moved on the stationary, non-rotatable threaded spindle.
  • the lifting device according to the invention enables stepless adjustment in a simple manner, due to the interaction of the lifting shears with the low-voltage direct current geared motor. Retrofitting a piece of furniture is extremely simple, since suitable components allow the ends of the scissor arms of the lifting shears to be attached to the components of the furniture part to be pivoted. Since the low-voltage direct current geared motor is a reversible motor, the furniture part to be pivoted can be pivoted out of any angular position into an extended or flat position. The lifting device according to the invention is therefore also suitable for self-installation.
  • the definition of the low-voltage direct current geared motor and the threaded spindle is particularly simple if the lifting shears have a fixed and a continuously adjustable spar, and that the ends of one side of the scissor arms of the lifting shears are rotatably mounted on the two spars, and if each opposite end of the scissor arms on the associated spar is slidably guided.
  • the lifting device can be attached particularly easily when retrofitting furniture. Since the low-voltage direct current geared motor moves on the threaded spindle after being switched on and is thus actuated via suitable connecting parts, it is particularly advantageous in terms of design if the stationary threaded spindle is parallel and at a certain distance from the uprights of the lifting shears.
  • the setting of the threaded spindle is particularly simple if it carries a fork head at one end, to which an angle lever fixed on a scissor arm is articulated, and that the low-voltage direct current geared motor is arranged in the opposite region of the stationary spindle.
  • the low-voltage direct current geared motor is expediently mounted in a fork which has a boom attached to a scissor arm. This creates favorable conditions for power transmission to the scissor arm during the movement of the low-voltage direct current geared motor, since the boom is fastened in the region of one end of the associated scissor arm.
  • An assembly and maintenance-friendly design is achieved if the fork head is formed from two interconnected levers that are cranked accordingly.
  • the slatted frame 10 shown in FIG. 1 has a head part 11 which can be pivoted about the horizontal axis.
  • This head part 11 can be pivoted by the lifting device 12 shown in FIG. 2.
  • the piece of slatted frame extending from the head part 11 to the end on the foot side can also be pivoted about a horizontal axis in the exemplary embodiment shown.
  • the lifting device 12 includes lifting scissors, which essentially consists of two scissor arms 13, 14 and two bars 15, 16.
  • the left ends of the scissor arms 13, 14 in the illustration are rotatably mounted on the spars 15, 16.
  • the bearings are in the end areas.
  • the opposite ends of the scissor arms 13, 14 are rotatably mounted on sliders 17, 18.
  • the lifting device 12 also includes a threaded spindle 19, which runs parallel and at a distance from the bars 15, 16 and on which a low-voltage direct current geared motor is placed. The threaded spindle 19 is held non-rotatably.
  • the lifting device also contains a power supply unit 21 so that the lifting device 12 can be supplied with power from the usual network.
  • the power supply 21 generates the required rectified low voltage from the mains voltage.
  • the power supply to the low-voltage direct current geared motor takes place via a standard cable.
  • a hand switch 22 is provided in the exemplary embodiment shown, which is not explained in detail since switches of this type are known.
  • the two scissor arms 13, 14 are rotatably mounted on a scissor pin 23 which is arranged centrally.
  • the lower bar 16 is assigned to the cross bar of the frame, the upper bar 15 to the outer cross bar of the adjustable head part 11. In relation to the installation position, the spars 15, 16 are then horizontal.
  • a fork head 24 is non-rotatably placed on the left end of the threaded spindle 19 in the illustration according to FIG. 2.
  • an angle lever 26 is fixed in the fork head 24. This angle lever is a two-armed lever formed because it is rotatably mounted in the end region of the scissor arm 14.
  • a force transmission roller 27 which engages under the scissor arm 14, is arranged on the angle lever 26 and contacts the surface assigned to the threaded spindle 19.
  • the power transmission roller 27 only acts in the lifting direction. In the lowering direction, it cannot pull the scissors together, thereby avoiding the risk of crushing.
  • the low-voltage DC geared motor 20 is suspended from the associated end of the scissor arm 13 by means of a fork.
  • This fork consists of two cranked levers which are connected to one another by means of screws 28 which are indicated.
  • the lever which can be seen in the illustration is identified by the reference symbol 29.
  • the other lever has the screw holes in the end area.
  • the lever 29 is designed so that a boom 30 is formed for the fork.
  • the rivet 30 is fastened to the associated end of the scissor arm 13 by two rivets 31.
  • an end cap 32 is placed, which at the same time limits the rightward movement of the low-voltage direct current geared motor 20.
  • a stop 33 is provided in the central region of the threaded spindle 19 so that the movement of the low-voltage direct current geared motor 20 to the left is limited.
  • the stop 33 can be moved on the spindle 19 with a certain amount of force.
  • a variable adjustment height of the lifting scissors of the lifting device 12 is thus achieved.
  • the housing of the low-voltage direct current geared motor is a two-part geared housing with a motor mount, which is made from a special plastic.
  • the motor contains an internal threaded nut, not shown for reasons of simplified fasting, which is the output element of the low-voltage direct current geared motor and is rotated when it is switched on. This shaft nut can have external teeth.
  • the limit switches for limiting the movement of the low-voltage DC geared motor are integrated in the housing and are actuated, when the end cap 32 or the stop 33 is touched.
  • the bars 15, 16 are connected to the bars of the frame or the slatted frame by means of fastening angles. From the drawing it already appears that the assembly of the lifting device 12 is extremely simple at the manufacturer, due to the solution of the fixed threaded spindle 19, the angle lever 26 and the fork containing the lever 28. Due to its flat design, the entire drive can advantageously be preassembled with the spar 15 at the slatted frame manufacturer and then folded in under the slatted frame 10 for storage and transport.
  • the motor with the gear and the spindle 19 are no thicker than the slatted frame 10, so that the usual dimensions of transport and storage are not impaired.
  • the two spars 15, 16 of the lifting device 12 are moved together by reversing the low-voltage direct-current geared motor 20.
  • the contact between the surface of the scissor arm 14 and the force transmission roller 27 is maintained by the weight of the lifting device 12. Since it only works in the lifting direction, it cannot pull the scissors together in the lowering direction, thereby avoiding the risk of crushing.
  • the housing of the power supply 21 consists of two parts.
  • the power supply 21 contains a transformer and a control board. It can also be designed for remote control operation.
  • the control unit 22 can, as shown, be a hand switch. However, a remote control receiver that responds by radio or infrared is also conceivable.
  • An electronic switching device would also be conceivable, for example for demonstration in a shop window with a continuous operation function.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Nursing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Transmission Devices (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Paper (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Warping, Beaming, Or Leasing (AREA)
  • Types And Forms Of Lifts (AREA)
  • Blinds (AREA)
  • Advancing Webs (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Noodles (AREA)

Abstract

A lifting device for turnable parts of a furniture article has a scissors-type element, an electric motor actuating the scissors-type element and having a driven member formed as a rotatable nut, and a stationary threaded spindle on which the electric motor is displaceable.

Description

Die vorliegende Erfindung betrifft eine Hubeinrichtung für schwenkbare Möbelteile eines Möbels, die eine von einem Motor mittels einer ortsfesten Gewindespindel betätigbare Hubschere aufweist.The present invention relates to a lifting device for pivotable furniture parts of a piece of furniture which has lifting scissors which can be actuated by a motor by means of a fixed threaded spindle.

Bei einer aus der CH-A-644011 bekannten Hubeinrichtung wird die ortsfeste Gewindespindel von einem nicht näher beschriebenen Motor in Drehung versetzt. Die Gewindespindel ist mit gegenläufigen Gewinden versehen, so daß die aufgesetzten Muttern je nach Drehrichtung der Gewindespindel auseinander oder zusammen gefahren werden. An den Muttern sind die Enden von zwei Scherenarmen angelenkt. Nachteilig ist bei dieser Hubeinrichtung, daß die Gewindespindel in Drehung versetzt wird, wodurch die Unfallgefahr erhöht wird. Außerdem ist sie äußerst aufwendig, bedingt durch die gegenläufigen Gewinde. Außerdem ist der nachträgliche Einbau in vorhandene Möbel äußerst problematisch.In a lifting device known from CH-A-644011, the stationary threaded spindle is rotated by a motor, which is not described in detail. The threaded spindle is provided with opposing threads, so that the attached nuts are moved apart or together depending on the direction of rotation of the threaded spindle. The ends of two scissor arms are hinged to the nuts. The disadvantage of this lifting device is that the threaded spindle is rotated, which increases the risk of accidents. In addition, it is extremely complex, due to the opposite threads. In addition, retrofitting into existing furniture is extremely problematic.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Hubeinrichtung zu schaffen, mit der mit schwenkbaren Möbelteilen ausgerüstete Möbel nachgerüstet werden, ferner soll sie einfach zu bedienen sein und daß zu verschwenkende Möbelteil soll von jeder Winkelstellung aus in die gestreckte Lage zurückzuschwenken sein.The present invention has for its object to provide a lifting device with which furniture equipped with pivotable furniture parts can be retrofitted, it should also be easy to use and the furniture part to be pivoted should be able to be pivoted back into the extended position from any angular position.

Die gestellte Aufgabe wird erfindungsgemäß gelöst, indem der Motor ein Niederspannungsgleichstromgetriebemotor ist, dessen Abtriebsglied als rotierend antreibbare Innengewindemutter ausgebildet ist, so daß der Niederspannungsgleichstromgetriebemotor auf der ortsfesten, nicht verdrehbaren Gewindespindel verfahrbar ist.The object is achieved according to the invention in that the motor is a low-voltage direct-current geared motor, the output member of which is designed as a rotationally drivable internal threaded nut, so that the low-voltage direct-current geared motor can be moved on the stationary, non-rotatable threaded spindle.

Die erfindungsgemäße Hubeinrichtung ermöglicht ein stufenloses Verstellen in einfacher Weise, bedingt durch das Zusammenwirken der Hubschere mit dem Niederspannungsgleichstromgetriebemotor. Die Nachrüstung eines Möbels ist äußerst einfach, da durch geeigente Bauteile die Enden der Scherenarme der Hubschere an die Bauteile des zu verschwenkenden Möbelteils anbringen lassen. Da der Niederspannungsgleichstromgetriebemotor ein drehrichtungsumkehrbarer Motor ist, kann das zu verschwenkende Möbelteil aus jeder Winkelstellung heraus in eine gestreckte bzw. flache Stellung geschwenkt werden. Die erfindungsgemäße Hubeinrichtung ist deshalb auch für den Selbsteinbau geeignet.The lifting device according to the invention enables stepless adjustment in a simple manner, due to the interaction of the lifting shears with the low-voltage direct current geared motor. Retrofitting a piece of furniture is extremely simple, since suitable components allow the ends of the scissor arms of the lifting shears to be attached to the components of the furniture part to be pivoted. Since the low-voltage direct current geared motor is a reversible motor, the furniture part to be pivoted can be pivoted out of any angular position into an extended or flat position. The lifting device according to the invention is therefore also suitable for self-installation.

Die Festlegung des Niederspannungsgleichstromgetriebemotors und der Gewindespindel wird besonders einfach, wenn die Hubschere einen festen und einen stufenlos verstellbaren Holm aufweist, und daß die Enden einer Seite der Scherenarme der Hubschere an den beiden Holmen drehbar gelagert sind, und wenn jedes gegenüberliegende Ende der Scherenarme auf dem zugeordneten Holm verschiebbar geführt ist. Außerdem läßt sich die Hubeinrichtung bei der Nachrüstung eines Möbels besonders einfach anbringen. Da sich der Niederspannungsgleichstromgetriebemotor nach dem Einschalten auf der Gewindespindel verschiebt und dadurch über geeignete Verbindungsteile betätigt, ist es konstruktiv besonders günstig, wenn die ortsfeste Gewindespindel parallel und in einem bestimmten Abstand zu den Holmen der Hubschere steht.The definition of the low-voltage direct current geared motor and the threaded spindle is particularly simple if the lifting shears have a fixed and a continuously adjustable spar, and that the ends of one side of the scissor arms of the lifting shears are rotatably mounted on the two spars, and if each opposite end of the scissor arms on the associated spar is slidably guided. In addition, the lifting device can be attached particularly easily when retrofitting furniture. Since the low-voltage direct current geared motor moves on the threaded spindle after being switched on and is thus actuated via suitable connecting parts, it is particularly advantageous in terms of design if the stationary threaded spindle is parallel and at a certain distance from the uprights of the lifting shears.

Die Festlegung der Gewindespindel ist besonders einfach, wenn sie an einem Ende einen Gabelkopf trägt, an dem ein an einem Scherenarm festgelegter Winkelhebel angelenkt ist, und daß der Niederspannungsgleichstromgetriebemotor im gegenüberliegenden Bereich der orstfesten Spindel angeordnet ist. Zweckmäßigerweise ist der Niederspannungsgleichstromgetriebemotor in einer Gabel gelagert, die einen an einem Scherenarm befestigten Ausleger aufweist. Dadurch entstehen bei der Bewegung des Niederspannungsgleichstromgetriebemotors günstige Verhältnisse zur Kraftübertragung auf den Scherenarm, da der Ausleger im Bereich eines Endes des zugeordneten Scherenarmes befestigt ist. Eine montage- und wartungsfreundliche Ausführung wird erreicht, wenn der Gabelkopf aus zwei miteinander verbundenen Hebeln gebildet ist, die entsprechend gekröpft sind.The setting of the threaded spindle is particularly simple if it carries a fork head at one end, to which an angle lever fixed on a scissor arm is articulated, and that the low-voltage direct current geared motor is arranged in the opposite region of the stationary spindle. The low-voltage direct current geared motor is expediently mounted in a fork which has a boom attached to a scissor arm. This creates favorable conditions for power transmission to the scissor arm during the movement of the low-voltage direct current geared motor, since the boom is fastened in the region of one end of the associated scissor arm. An assembly and maintenance-friendly design is achieved if the fork head is formed from two interconnected levers that are cranked accordingly.

Weitere Kennzeichen und Merkmale einer vorteilhaften Ausgestaltung der vorliegenden Erfindung sind Gegenstand von weiteren Unteransprüchen und ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels.
Es zeigen:

Fig. 1
ein mit einer erfindungsgemäßen Hubeinrichtung ausgerüstetes Lattenrost in perspektivischer Darstellung,
Fig. 2
die Hubeinrichtung nach der Fig. 1 im Aufriß und
Fig. 3
eine Einzelheit der Fig. 2 in Schnittdarstellung, die Anordnung der Gleitstücke an den Scherenarmen zeigend.
Further characteristics and features of an advantageous embodiment of the present invention are the subject of further subclaims and result from the following description of a preferred exemplary embodiment.
Show it:
Fig. 1
a slatted frame equipped with a lifting device according to the invention in a perspective view,
Fig. 2
the lifting device of FIG. 1 in elevation and
Fig. 3
a detail of FIG. 2 in a sectional view showing the arrangement of the sliders on the scissor arms.

Der in der Fig. 1 dargestellte Lattenrost 10 weist ein um die Horizontalachse schwenkbares Kopfteil 11 auf. Dieses Kopfteil 11 ist durch die in der Fig. 2 dargestellte Hubeinrichtung 12 schwenkbar. Auch das vom Kopfteil 11 bis zum fußseitigen Ende reichende Stück des Lattenrostes ist im dargestellten Ausführungsbeispiel um eine Horizontalachse schwenkbar. Die Hubeinrichtung 12 beinhaltet eine Hubschere, die im wesentlichen aus zwei Scherenarmen 13, 14 und zwei Holmen 15, 16 besteht. Die in der Darstellung linken Enden der Scherenarme 13, 14 sind an den Holmen 15, 16 drehbar gelagert. Die Lagerstellen liegen in den Endbereichen. Die gegenüberliegenden Enden der Scherenarme 13, 14 sind an Gleitstücken 17, 18 drehbar gelagert. Diese Gleitstücke 17, 18 sind verschiebbar auf die Holme 15, 16 aufgesetzt, so daß die Holme 15, 16 im Sinne von Führungsstangen zu sehen sind. Gemäß der Fig. 3 wird zunächst ein Gleitstück 17 bzw. 18 auf den zugehörigen Scherenarm 13 bzw. 14 vormontiert. Der jeweilige Holm 15 bzw. 16 wird später eingeschoben und hat zum zugeordneten Scherenarm 13, 14 relativ wenig Luft. Durch diese vorteilhafte Ausbildung wird die Hubschere besonders stabilisiert, da nur sehr geringe Kippmomente auftreten können. Die Hubeinrichtung 12 beinhaltet außerdem noch eine parallel und im Abstand zu den Holmen 15, 16 verlaufende Gewindespindel 19, auf die ein Niederspannungsgleichstromgetriebemotor aufgesetzt ist. Die Gewindespindel 19 ist unverdrehbar gehalten. Die Hubeinrichtung beinhaltet ferner noch ein Netzteil 21, damit die Hubeinrichtung 12 aus dem üblichen Netz mit Strom versorgt werden kann. Das Netzteil 21 erzeugt aus der Netzspannung die erforderliche gleichgerichtete Niederspannung. Die Stromzuführung zum Niederspannungsgleichstromgetriebemotor erfolgt durch ein übliches Kabel. Zum Ein- und Ausschalten des Niederspannungsgleichstromgetriebemotors ist im dargestellten Ausführungsbeispiel ein Handschalter 22 vorgesehen, der nicht näher erläutert wird, da derartige Schalter bekannt sind.The slatted frame 10 shown in FIG. 1 has a head part 11 which can be pivoted about the horizontal axis. This head part 11 can be pivoted by the lifting device 12 shown in FIG. 2. The piece of slatted frame extending from the head part 11 to the end on the foot side can also be pivoted about a horizontal axis in the exemplary embodiment shown. The lifting device 12 includes lifting scissors, which essentially consists of two scissor arms 13, 14 and two bars 15, 16. The left ends of the scissor arms 13, 14 in the illustration are rotatably mounted on the spars 15, 16. The bearings are in the end areas. The opposite ends of the scissor arms 13, 14 are rotatably mounted on sliders 17, 18. These sliders 17, 18 are slidably mounted on the bars 15, 16 so that the bars 15, 16 can be seen in the sense of guide rods. According to FIG. 3, a slide 17 or 18 is first preassembled on the associated scissor arm 13 or 14. The respective spar 15 or 16 is later inserted and has relatively little air to the associated scissor arm 13, 14. Due to this advantageous design, the lifting shears are particularly stabilized since only very small tilting moments can occur. The lifting device 12 also includes a threaded spindle 19, which runs parallel and at a distance from the bars 15, 16 and on which a low-voltage direct current geared motor is placed. The threaded spindle 19 is held non-rotatably. The lifting device also contains a power supply unit 21 so that the lifting device 12 can be supplied with power from the usual network. The power supply 21 generates the required rectified low voltage from the mains voltage. The power supply to the low-voltage direct current geared motor takes place via a standard cable. To switch the low-voltage direct current geared motor on and off, a hand switch 22 is provided in the exemplary embodiment shown, which is not explained in detail since switches of this type are known.

Die beiden Scherenarme 13, 14 sind auf einem Scherenbolzen 23 drehbar gelagert, der zentrisch angeordnet ist. Bei Verwendung der Hubeinrichtung 12 für ein Lattenrost 10 ist der untere Holm 16 dem Querholm des Rahmens, der obere Holm 15 dem äußeren Querholm des verstellbaren Kopfteiles 11 zugeordnet. Bezogen auf die Einbaulage stehen die Holme 15, 16 dann horizontal. Auf das in der Darstellung nach der Fig. 2 linke Ende der Gewindespindel 19 ist ein Gabelkopf 24 drehfest aufgesetzt. Mitels eines Bolzens 25 ist in den Gabelkopf 24 ein Winkelhebel 26 festgesetzt. Dieser Winkelhebel ist als zweiarmiger Hebel ausgebildet, da er im Endbereich des Scherenarmes 14 drehbar gelagert ist. Im Bereich des dem Gabelkopf 24 abgewandten Endes ist an dem Winkelhebel 26 eine den Scherenarm 14 untergreifende Kraftübertragungsrolle 27 angeordnet, die die der Gewindespindel 19 zugeordnete Fläche kontaktiert. Die Kraftübertragungsrolle 27 wirkt nur in Hubrichtung. In Absenkrichtung kann sie die Schere nicht zusammenziehen, wodurch eine Quetschgefahr vermieden wird.The two scissor arms 13, 14 are rotatably mounted on a scissor pin 23 which is arranged centrally. When using the lifting device 12 for a slatted frame 10, the lower bar 16 is assigned to the cross bar of the frame, the upper bar 15 to the outer cross bar of the adjustable head part 11. In relation to the installation position, the spars 15, 16 are then horizontal. A fork head 24 is non-rotatably placed on the left end of the threaded spindle 19 in the illustration according to FIG. 2. By means of a bolt 25, an angle lever 26 is fixed in the fork head 24. This angle lever is a two-armed lever formed because it is rotatably mounted in the end region of the scissor arm 14. In the region of the end facing away from the fork head 24, a force transmission roller 27, which engages under the scissor arm 14, is arranged on the angle lever 26 and contacts the surface assigned to the threaded spindle 19. The power transmission roller 27 only acts in the lifting direction. In the lowering direction, it cannot pull the scissors together, thereby avoiding the risk of crushing.

Der Niederspannungsgleichstromgetriebemotor 20 ist mittels einer Gabel an dem zugeordneten Ende des Scherenarmes 13 aufgehängt. Diese Gabel besteht aus zwei gekröpften Hebeln, die durch andeutungsweise dargestellte Schrauben 28 miteinander verbunden sind. Der in der Darstellung erkennbare Hebel ist durch das Bezugszeichen 29 gekennzeichnet. Der andere Hebel hat im Endbereich die Schraubenlöcher. Wie aus der Fig. 2 erkennbar, ist der Hebel 29 so gestaltet, daß für die Gabel ein Ausleger 30 entsteht. Durch zwei Niete 31 ist aus der Ausleger 30 an dem zugeordneten Ende des Scherenarmes 13 befestigt. Auf die Gewindespindel 19 ist an der dem Gabelkopf 24 abgewandten Seite eine Abschlußkappe 32 aufgesetzt, die gleichzeitig die nach rechts gehende Bewegung des Niederspannungsgleichstromgetriebemotors 20 begrenzt. Im mittleren Bereich der Gewindespindel 19 ist ein Anschlag 33 vorgesehen, damit die nach links gerichtete Bewegung des Niederspannungsgleichstromgetriebemotors 20 begrenzt ist. Der Anschlag 33 ist auf der Spindel 19 mit einem gewissen Kraftaufwand verschiebbar. Somit wird eine variable Verstellhöhe der Hubschere der Hubeinrichtung 12 erreicht. In nicht dargestellter Weise ist das Gehäuse des Niederspannungsgleichstromgetriebemotors ein zweiteiliges Getriebegehäuse mit einer Motoraufnahme, welches aus einem Spezialkunststoff gefertigt ist. Außerdem enthält der Motor eine, aus Gründen der vereinfachten Fastellung nicht gezeigte Innengewindemutter, die das Abtriebsglied des Niederspannungsgleichstromgetriebemotors ist und beim Einschalten gedreht wird. Diese Wellenmutter kann eine Außenverzahnung aufweisen. Die Endschalter zur Begrenzung der Bewegung des Niederspannungsgleichstromgetriebemotors sind in dem Gehäuse integriert und werden betätigt, wenn die Abschlußkappe 32 oder der Anschlag 33 berührt wird. Bei der Verwendung der Hubeinrichtung 12 für ein Lattenrost 10 werden mittels Befestigungswinkel die Holme 15, 16 mit den Holmen des Rahmens bzw. des Lattenrostes verbunden. Aus der Zeichnung ergibt sich schon, daß auch die Montage der Hubeinrichtung 12 beim Hersteller äußerst einfach ist, bedingt durch die Lösung der feststehenden Gewindespindel 19, dem Winkelhebel 26 und der den Hebel 28 beinhaltenden Gabel. Durch seine flache Bauweise kann der Gesamtantrieb in vorteilhafter Weise beim Lattenrosthersteller mit dem Holm 15 vormontiert und dann zur Lagerung und zum Transport unter den Lattenrost 10 eingeklappt werden. Der Motor mit dem Getriebe und der Spindel 19 sind nicht dicker als der Lattenrost 10, so daß die üblichen Transport-und Lagerabmaße nicht beeinträchtigt werden.The low-voltage DC geared motor 20 is suspended from the associated end of the scissor arm 13 by means of a fork. This fork consists of two cranked levers which are connected to one another by means of screws 28 which are indicated. The lever which can be seen in the illustration is identified by the reference symbol 29. The other lever has the screw holes in the end area. As can be seen from Fig. 2, the lever 29 is designed so that a boom 30 is formed for the fork. The rivet 30 is fastened to the associated end of the scissor arm 13 by two rivets 31. On the threaded spindle 19 on the side facing away from the fork head 24, an end cap 32 is placed, which at the same time limits the rightward movement of the low-voltage direct current geared motor 20. A stop 33 is provided in the central region of the threaded spindle 19 so that the movement of the low-voltage direct current geared motor 20 to the left is limited. The stop 33 can be moved on the spindle 19 with a certain amount of force. A variable adjustment height of the lifting scissors of the lifting device 12 is thus achieved. In a manner not shown, the housing of the low-voltage direct current geared motor is a two-part geared housing with a motor mount, which is made from a special plastic. In addition, the motor contains an internal threaded nut, not shown for reasons of simplified fasting, which is the output element of the low-voltage direct current geared motor and is rotated when it is switched on. This shaft nut can have external teeth. The limit switches for limiting the movement of the low-voltage DC geared motor are integrated in the housing and are actuated, when the end cap 32 or the stop 33 is touched. When using the lifting device 12 for a slatted frame 10, the bars 15, 16 are connected to the bars of the frame or the slatted frame by means of fastening angles. From the drawing it already appears that the assembly of the lifting device 12 is extremely simple at the manufacturer, due to the solution of the fixed threaded spindle 19, the angle lever 26 and the fork containing the lever 28. Due to its flat design, the entire drive can advantageously be preassembled with the spar 15 at the slatted frame manufacturer and then folded in under the slatted frame 10 for storage and transport. The motor with the gear and the spindle 19 are no thicker than the slatted frame 10, so that the usual dimensions of transport and storage are not impaired.

Zum Auseinanderfahren der beiden Holme 15, 16 wird nach Einschalten des Niederspannungsgleichstromgetriebemotors 20 dieser auf der feststehenden Gewindespindel 19 in Richtung zum Gabelkopf 24 verfahren. Dadurch verschieben sich die rechten Enden der Scherenarme 13, 14 auch in Richtung zum Gabelkopf 24, da der Hebel 28 in Verbindung mit dem Ausleger 30 den Scherenarm 13 mitnimmt. Gleichzeitig verschiebt sich jedoch der Gabelkopf 24 in Richtung zum Niederspannungsgleichstromgetriebemotor 20, bedingt durch das sich einstellende Gleichgewicht der Kräfte. Dadurch hält die Kraftübertragungsrolle 27 ständig Kontakt mit der der Gewindespindel 19 zugewandten Fläche des Scherenarmes 14. Dadurch wird die Aufstellbewegung der Hubeinrichtung 12 noch unterstützt. Das Zusammenfahren der beiden Holme 15, 16 der Hubeinrichtung 12 erfolgt durch Umsteuern des Niederspannungsgleichstromgetriebemotors 20. Dadurch wird durch das Eigengewicht der Hubeinrichtung 12 der Kontakt zwischen der Fläche des Scherenarmes 14 und der Kraftübertragungsrolle 27 aufrechterhalten. Da sie nur in Hubrichtung wirkt, kann sie die Schere in Absenkrichtung nicht zusammenziehen, wodurch die Quetschgefahr vermieden wird.To move the two spars 15, 16 apart, after switching on the low-voltage direct current geared motor 20, the latter is moved on the fixed threaded spindle 19 in the direction of the fork head 24. As a result, the right ends of the scissor arms 13, 14 also move in the direction of the fork head 24, since the lever 28 takes the scissor arm 13 along with the boom 30. At the same time, however, the clevis 24 shifts in the direction of the low-voltage direct current geared motor 20, due to the equilibrium of the forces. As a result, the force transmission roller 27 is in constant contact with the surface of the scissor arm 14 facing the threaded spindle 19. This further supports the lifting movement of the lifting device 12. The two spars 15, 16 of the lifting device 12 are moved together by reversing the low-voltage direct-current geared motor 20. As a result, the contact between the surface of the scissor arm 14 and the force transmission roller 27 is maintained by the weight of the lifting device 12. Since it only works in the lifting direction, it cannot pull the scissors together in the lowering direction, thereby avoiding the risk of crushing.

Das Gehäuse des Netzteiles 21 besteht aus zwei Teilen. Das Netzteil 21 enthält einen Transformator und eine Steuerplatine. Es kann außerdem für einen Fernsteuerungsbetrieb ausgelegt sein. Das Bedienteil 22 kann, wie dargestellt, ein Handschalter sein. Denkbar ist jedoch auch, ein Fernsteuerempfänger, der durch Funk oder Infrarot anspricht. Es wäre auch ein elektronisches Schaltgerät denkbar, z.B. zur Demonstration in einem Schaufenster mit einer Dauerlauffunktion.The housing of the power supply 21 consists of two parts. The power supply 21 contains a transformer and a control board. It can also be designed for remote control operation. The control unit 22 can, as shown, be a hand switch. However, a remote control receiver that responds by radio or infrared is also conceivable. An electronic switching device would also be conceivable, for example for demonstration in a shop window with a continuous operation function.

Claims (18)

  1. A lifting device for pivotable parts of an article of furniture, which has a lifting scissor assembly (13, 14, 15, 16) actuable by a motor (20) by means of a stationary worm spindle (19), characterised in that the motor (20) is a low-voltage dc gear motor unit whose output member is in the form of an internally screwthreaded nut which can be driven in rotation so that the low-voltage dc gear motor unit is movable on the stationary, non-rotatable worm spindle (19).
  2. A lifting device according to claim 1 characterised in that the lifting scissor assembly has a steplessly displaceable and a fixed strut (15, 16), that the ends of one side of the scissor arms (13, 14) of the lifting scissor assembly are rotatably mounted to the two struts (15, 16) and that each oppositely disposed end of the scissor arms (13, 14) is guided displaceably on the associated strut.
  3. A lifting device according to claim 2 characterised in that the stationary worm spindle (19) is disposed parallel and at a given spacing relative to the struts (15, 16) of the lifting scissor assembly.
  4. A lifting device according to claim 3 characterised in that fitted on to the end of the worm spindle (19) which is associated with the rotatably mounted ends of the scissor arms (13, 14) is a fork head (24) to which an angle lever (26) mounted rotatably on a scissor arm is pivotably connected, and that the low-voltage dc gear motor unit (20) is fitted on the region of the worm spindle (19), which is remote from the fork head (24).
  5. A lifting device according to claim 4 characterised in that the range of movement of the low-voltage dc gear motor unit (20) extends to the centre of the worm spindle (19).
  6. A lifting device according to claim 1 characterised in that the low-voltage dc gear motor unit (20) is suspended by means of a fork which has a cantilever arm (30) fixed to a scissor arm (13).
  7. A lifting device according to claim 6 characterised in that the cantilever arm (30) is the end of a lever (28), that is remote from the low-voltage dc gear motor unit (20), and that the fork head is formed from two cranked levers which are connected together.
  8. A lifting device according to claim 1 characterised in that the end of the worm spindle (19) that is remote from the fork head (24) has a terminal cap (32) and fitted thereon in the middle region is a stop (33) for actuating switches arranged in the housing of the low-voltage dc gear motor unit (20).
  9. A lifting device according to claim 8 characterised in that the height of displacement of the lifting scissor assembly of the lifting device (12) is variable by means of the displaceable stop (33).
  10. A lifting device according to one or more of the preceding claims characterised in that the end of the angle lever (26), that is remote from the fork head (24), carries a force-transmitting roller (27) which engages under the scissor arm (14) and contacts the surface that is towards the worm spindle (19).
  11. A lifting device according to claim 10 characterised in that for eliminating a risk of being crushed the force-transmitting roller (27) which is mounted on the angle lever (26) transmits a force only when the lifting scissor assembly of the lifting device (12) diverges.
  12. A lifting device according to one or more of the preceding claims characterised in that the housing of the low-voltage dc gear motor unit (20) is a two-part housing made from special plastics material with a motor receiving means.
  13. A lifting device according to one or more of the preceding claims characterised in that the shaft nut which is provided with a screwthread is the output member of the low-voltage dc gear motor unit and has an external tooth configuration.
  14. A lifting device according to one or more of the preceding claims characterised in that the lifting device includes a mains unit (21) having a housing which comprises two housing portions and that the mains unit is provided with a transformer and a control board.
  15. A lifting device according to claim 14 characterised in that the mains unit (21) has at least one but preferably two connections for a respective drive.
  16. A lifting device according to one or more of the preceding claims characterised in that the lifting device includes an operating portion which is in the form of a manual switch (22), a remote control receiver or an electronic switching device.
  17. A lifting device according to one or more of the preceding claims characterised in that the slide portions (17, 18) are in the form of flat portions for the purposes of affording a relatively low tilting moment and for stabilisation purposes, and that the play relative to the associated scissor arm (13 or 14 respectively) is slight.
  18. A lifting device according to one or more of the preceding claims characterised in that for storage and transportation of the slatted frame (10) equipped with the lifting device (12), the lifting device (12) can be pivoted beneath the slatted frame (10) so that the width of the slatted frame (10) remains unaltered.
EP92104351A 1991-03-28 1992-03-13 Lifting device Expired - Lifetime EP0505847B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9103817U 1991-03-28
DE9103817U DE9103817U1 (en) 1991-03-28 1991-03-28 Lifting device

Publications (2)

Publication Number Publication Date
EP0505847A1 EP0505847A1 (en) 1992-09-30
EP0505847B1 true EP0505847B1 (en) 1995-08-30

Family

ID=6865770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92104351A Expired - Lifetime EP0505847B1 (en) 1991-03-28 1992-03-13 Lifting device

Country Status (7)

Country Link
US (1) US5305482A (en)
EP (1) EP0505847B1 (en)
JP (1) JPH0777959B2 (en)
AT (1) ATE126984T1 (en)
DE (2) DE9103817U1 (en)
DK (1) DK0505847T3 (en)
ES (1) ES2076587T3 (en)

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Also Published As

Publication number Publication date
DE9103817U1 (en) 1991-06-27
DK0505847T3 (en) 1995-12-18
ATE126984T1 (en) 1995-09-15
EP0505847A1 (en) 1992-09-30
JPH0777959B2 (en) 1995-08-23
US5305482A (en) 1994-04-26
JPH05238681A (en) 1993-09-17
ES2076587T3 (en) 1995-11-01
DE59203415D1 (en) 1995-10-05

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