EP2845520B1 - Device for controlling a furniture drive - Google Patents

Device for controlling a furniture drive Download PDF

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Publication number
EP2845520B1
EP2845520B1 EP14179649.0A EP14179649A EP2845520B1 EP 2845520 B1 EP2845520 B1 EP 2845520B1 EP 14179649 A EP14179649 A EP 14179649A EP 2845520 B1 EP2845520 B1 EP 2845520B1
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EP
European Patent Office
Prior art keywords
sliding portion
blocking
locking pawl
housing
blocking slider
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EP14179649.0A
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German (de)
French (fr)
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EP2845520A1 (en
Inventor
Andreas Oberndörfer
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Dewertokin GmbH
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Dewertokin GmbH
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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
    • 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
    • A47C20/042—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination by means of screw-and-nut mechanism
    • 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

Definitions

  • the invention relates to a device for controlling an electromotive linear drive designed as a furniture drive for adjusting movably mounted parts of reclining and seating furniture, in particular for the care sector, for example for hospital beds.
  • Such a device has at least one accommodated in a housing drive train, which consists of an electric motor, a downstream of this reduction gear and a drivable by this threaded spindle for displacement of a lifting element for lifting and lowering the respective movable furniture part.
  • a housing drive train which consists of an electric motor, a downstream of this reduction gear and a drivable by this threaded spindle for displacement of a lifting element for lifting and lowering the respective movable furniture part.
  • the inventive device comprises a provided in the drive train switchable dog clutch, which is held by a spring mechanism in engagement, equipped with a switching element switching mechanism for opening and closing the dog clutch and a separately actuable locking mechanism with which the dog clutch, for example in the event of emergency lowering , is lockable in its open position.
  • a switching mechanism has already been proposed ( DE 10 2012 211 508.0 ), with the engagement and disengagement is suddenly realized.
  • the intermediate positions of the switch are quickly traversed by the influence of prestressed spring elements, so that the engagement and disengagement takes place very briefly and thereby a longer while over-grinding of the coupling halves is avoided.
  • the invention is therefore an object of the invention to provide a solution that the jaw clutch is closed again after a Notabsenkung the furniture parts and the linear drive is prepared for a renewed lifting of the respective furniture part.
  • the construction of the device according to the invention can be designed in detail so that the pawl is biased by a spring in the direction of its blocking position, in which it can be latched behind the latching element of the blocking slide. As a result, the pawl automatically reaches its blocking position upon movement of the blocking slide into the open position of the dog clutch.
  • the sliding piece is expediently displaceably guided parallel to the blocking slide and can have a projecting catch which releases the pawl when the sliding piece moves in the direction of the front end of the blocking slide connected to the dog clutch, so that the blocking slide, which is spring-loaded, can move in the direction of the closed position of the dog clutch.
  • the blocking slide is preferably displaceable against the force of the mentioned tension spring via a Bowden cable in the direction of the open position of the dog clutch.
  • the blocking slide can be displaceably guided relative to the housing in the axial direction of the threaded spindle.
  • a particularly useful construction is that provided on the blocking slide locking element is designed as a protruding latching lug, with which the pawl can be operated in a very simple manner.
  • the pawl which can be latched behind the latching element or the latching lug of the blocking slide, is expediently mounted pivotably on the housing.
  • the sliding piece can be guided displaceably parallel to the blocking slide, whereby a very simple and slim design is possible.
  • FIG. 1 The drawing shows an overall view of an electromotive linear drive in the form of a double drive 1 is shown. The essential parts of the drive are enclosed by a housing 2.
  • the in Fig. 1 shown double drive is for example provided for a hospital bed, wherein the shaft 3 with the support legs 5, the head part raises and lowers, while the shaft 4 is provided with the support legs 6 for actuating the foot part.
  • the emergency switching device serves to quickly and safely lower the head part by means of the shaft 3 and the support legs 5 with the clutch open by its own gravity.
  • Fig. 2 are all housing parts 2, 7 and 8 omitted, so that provided for the head part left drive train with all its individual parts is visible.
  • the drive train provided for the head part consists of an electric motor 7, a reduction gear downstream of the latter in the form of a worm gear 10 and a threaded spindle 11 drivable by the latter for displacing a lifting element 12.
  • the lifting element 12 actuates a pressure lever 13 attached to the shaft 3 so that at an axial displacement of the lifting element 12, the shaft 3 is rotated.
  • the head part is raised or lowered by the pivoting movement of the shaft 3.
  • a dog clutch 14 is provided between the worm gear 10 and the threaded spindle 11, which can be opened and closed by means of a shift fork 15.
  • the switching process takes place in normal operation via a in the Switch housing 7 mounted switch 16, as he, for example, in the earlier patent application DE 10 2012 211 508.0 is described.
  • a separately actuable locking mechanism 17 is provided with which the jaw clutch 14 is reliably locked in its open position. This precaution should serve to reliably keep the claws provided on the two coupling halves separate during emergency lowering, so that they are not damaged.
  • the blocking mechanism 17 has a blocking slide 18, which is displaceably guided relative to the housing 2 in the longitudinal direction of the threaded spindle 11.
  • the blocking slide 18 engages in a coming from the switch 16 and connected to the shift fork 15 slide valve 19 a.
  • the blocking slide 18 is spring-loaded in the direction of the closed position of the coupling, by means of a tension spring 20, which is fastened on the one hand to the blocking slide 18 and on the other hand to the housing 2.
  • the blocking slide 18 is displaceable with a separate actuating mechanism 21 against the spring load by the tension spring 20 in the direction of the open position of the dog clutch 14.
  • actuating mechanism 21 two Bowden cables 22 are provided in the embodiment shown in the drawing, which can be guided to easily accessible locations on both sides of the hospital bed and operated from there.
  • a laterally projecting detent 23 is provided, which cooperates with a pawl 24 pivotally mounted on the housing 2.
  • the shift fork 15 is actuated such that the dog clutch 14 assumes its open position.
  • the pawl 24 snaps into the in Fig. 3 shown position, in which it engages behind the detent 23 of the locking slide 18 so that it is prevented from moving in the drawing to the right in a position in which the dog clutch 14 is closed.
  • To the overall mechanism further includes a relative to the housing 2 movable sliding piece 25, with which the pawl 24 in the lowered state of the corresponding furniture part of the latch 23 is releasable to release the blocking slide 18 so that it can move back to the right in the drawing to close the dog clutch 14.
  • the sliding piece 25 is guided parallel to the blocking slide 18 and has a projecting driver 26, which in a movement of the sliding piece (25) in the drawing to the right, ie towards the front end of the blocking slide 18 connected to the dog clutch 14, against the pawl 24 presses. This is thereby pivoted against a tension applied by a tension spring 27 clockwise and thereby separated from the locking lug 23 of the blocking slide 18, so that the blocking slide 18 is moved by the spring load of the tension spring 20 to the right and the dog clutch is closed again.
  • the movement of the sliding piece 25 can be achieved in various ways. It is only important that the sliding piece 25, if the corresponding furniture part completely has been lowered, then moved in the drawing to the right to actuate the pawl 24 and the jaw clutch 14 to close, so that the drive train is ready for use again and the corresponding furniture part can be raised again via the motor 7.
  • an actuating lever 28 is rotatably mounted on the shaft 3, which, when the support legs 5 assume their pivoted down position, the sliding piece 25 actuate.
  • the end of the sliding piece 25 protrudes laterally out of the housing 2 and is moved to the right when completely lowering the support legs 5 in the drawing so that the driver 26 releases the pawl 24 from its in Fig. 3 illustrated blocking position in which it is behind the locking lug 23 of the blocking slide 18, in the in Fig. 2 shown inactive position is pivoted.
  • the blocking slide 18 moves by means of the tension spring 20 to the right, whereby the jaw clutch 14 can again assume their closed position.
  • the pawl 24 can be actuated by means of a separate Bowden cable.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Nursing (AREA)
  • Transmission Devices (AREA)
  • Invalid Beds And Related Equipment (AREA)
  • Mechanical Operated Clutches (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Steuerung eines als Möbelantrieb ausgebildeten elektromotorischen Linearantriebs zum Verstellen von beweglich gelagerten Teilen von Liege- und Sitzmöbeln, insbesondere für den Pflegebereich, beispielsweise für Krankenbetten.The invention relates to a device for controlling an electromotive linear drive designed as a furniture drive for adjusting movably mounted parts of reclining and seating furniture, in particular for the care sector, for example for hospital beds.

Eine solche Vorrichtung weist mindestens einen in einem Gehäuse untergebrachten Antriebsstrang auf, der aus einem Elektromotor, einem diesem nachgeschalteten Reduziergetriebe sowie einer von diesem antreibbaren Gewindespindel zur Verschiebung eines Hubelements zum Heben und Absenken des jeweiligen beweglichen Möbelteils besteht.Such a device has at least one accommodated in a housing drive train, which consists of an electric motor, a downstream of this reduction gear and a drivable by this threaded spindle for displacement of a lifting element for lifting and lowering the respective movable furniture part.

Ferner umfasst die erfindungsgemäße Vorrichtung eine in dem Antriebsstrang vorgesehenen schaltbaren Klauenkupplung, die mittels eines Federmechanismus im Eingriff gehalten wird, einen mit einem Schaltelement ausgestatteten Schaltmechanismus zum Öffnen und Schließen der Klauenkupplung sowie einen gesondert betätigbaren Blockiermechanismus, mit dem die Klauenkupplung, beispielsweise im Falle einer Notabsenkung, in ihrer geöffneten Stellung arretierbar ist.Further, the inventive device comprises a provided in the drive train switchable dog clutch, which is held by a spring mechanism in engagement, equipped with a switching element switching mechanism for opening and closing the dog clutch and a separately actuable locking mechanism with which the dog clutch, for example in the event of emergency lowering , is lockable in its open position.

Bei elektromotorischen Linearantrieben der genannten Art besteht das Problem, die Kupplungshälfte der Klauenkupplungen beim Ein- und Auskuppeln weitestgehend zu schonen. In den Betriebszuständen, bei denen die Kupplungshälften "nahezu ausgekuppelt" bzw. "nahezu eingekuppelt" sind, kann es zu starken Beanspruchungen der Verzahnungen kommen, weil unter Last bzw. unter Drehmoment geschaltet wird.In electromotive linear drives of the type mentioned there is the problem to spare the coupling half of the jaw clutches when engaging and disengaging as far as possible. In the operating states in which the coupling halves are "almost disengaged" or "almost engaged", it can lead to heavy loads of the gears, because under load or under torque is switched.

Es ist bereits ein Schaltmechanismus vorgeschlagen worden ( DE 10 2012 211 508.0 ), mit dem ein Einkuppeln und Auskuppeln schlagartig realisiert wird. Dabei werden die Zwischenstellungen des Schalters durch den Einfluss vorgespannter Federelemente rasch durchlaufen, so dass das Ein- und Auskuppeln sehr kurzzeitig erfolgt und dadurch ein länger währendes Übereinanderschleifen der Kupplungshälften vermieden wird.A switching mechanism has already been proposed ( DE 10 2012 211 508.0 ), with the engagement and disengagement is suddenly realized. The intermediate positions of the switch are quickly traversed by the influence of prestressed spring elements, so that the engagement and disengagement takes place very briefly and thereby a longer while over-grinding of the coupling halves is avoided.

Insbesondere bei Kranken- oder Pflegebetten wird gefordert, dass die Absenkbewegung der beweglichen Möbelteile schneller und auch unabhängig von den Antriebsmotoren, beispielsweise bei Stromausfall, erfolgen soll. Dabei soll sichergestellt werden, dass beim Absenken der beweglichen Möbelteile die Kupplung im ausgekuppelten Zustand verbleibt, selbst wenn eine Bedienungsperson versehentlich durch falsche Betätigung die Kupplung wieder schließt.In particular, in sick or care beds is required that the lowering movement of the movable furniture parts should be faster and independent of the drive motors, for example in case of power failure. It should be ensured that when lowering the movable furniture parts, the clutch remains in the disengaged state, even if an operator inadvertently closes the clutch again by incorrect operation.

Bei einer bekannten Konstruktion ( EP 1 800 567 B1 ), die sich bereits in der Praxis bewährt hat, ist ein Blockierelement vorgesehen, mit der die ausgerückte Stellung der Kupplung arretierbar ist. Wenn zu einem späteren Zeitpunkt die beweglichen Möbelteile wieder nach oben geschwenkt werden sollen, kann es bei dieser bekannten Konstruktion unter Umständen vorkommen, dass die Kupplung nicht rechtzeitig geschlossen wird, so dass die Motoren zunächst leer laufen.In a known construction ( EP 1 800 567 B1 ), which has already proven itself in practice, a blocking element is provided, with which the disengaged position of the coupling can be locked. If at a later date the movable furniture parts are to be pivoted back up, it may happen in this known construction under circumstances that the clutch is not closed in time, so that the motors initially run empty.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Lösung zu schaffen, dass die Klauenkupplung nach einer Notabsenkung der Möbelteile wieder geschlossen wird und der Linearantrieb für ein erneutes Anheben des jeweiligen Möbelteils vorbereitet ist.The invention is therefore an object of the invention to provide a solution that the jaw clutch is closed again after a Notabsenkung the furniture parts and the linear drive is prepared for a renewed lifting of the respective furniture part.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst,

  • dass der Blockiermechanismus einen Blockierschieber aufweist, der relativ zu dem Gehäuse verschieblich geführt, direkt oder indirekt mit dem Schaltelement verbunden und in Richtung der geschlossenen Stellung des Schaltelements federbelastet ist,
  • dass der Blockierschieber mit einem gesonderten Betätigungsmechanismus entgegen der Federbelastung in Richtung der geöffneten Stellung der Klauenkupplung verschiebbar ist,
  • dass an dem Blockierschieber ein Rastelement vorgesehen ist,
  • dass an dem Gehäuse eine Sperrklinke beweglich befestigt ist, die hinter dem Rastelement des Blockierschiebers einrastbar ist, wenn dieser seine der geöffneten Stellung der Klauenkupplung entsprechende Position erreicht hat, und
  • dass ferner ein relativ zu dem Gehäuse bewegliches Schiebestück vorgesehen ist, mit welchem die Sperrklinke im abgesenkten Zustand des entsprechenden Möbelteils von dem Rastelement lösbar ist.
According to the invention, this object is achieved by
  • in that the blocking mechanism comprises a blocking slide which is displaceably guided relative to the housing, directly or indirectly connected to the switching element and spring-loaded in the direction of the closed position of the switching element,
  • that the blocking slide is displaceable with a separate actuating mechanism against the spring load in the direction of the open position of the dog clutch,
  • a latching element is provided on the blocking slide,
  • that on the housing a pawl is movably mounted, which is latched behind the locking element of the blocking slide, when this has reached its position corresponding to the open position of the dog clutch, and
  • in that a sliding piece which is movable relative to the housing is furthermore provided, with which the locking pawl can be released from the latching element in the lowered state of the corresponding furniture part.

Zum Schließen der Klauenkupplung nach dem Absenken der beweglichen Möbelteile stehen verschiedene Möglichkeiten zur Verfügung, wobei es lediglich darauf ankommt, mit dem Schiebestück die Sperrklinke von dem Blockierschieber zu lösen. Dies kann wie folgt ausgeführt werden:

  1. 1. Das Schiebestück kann zur Lösung der Sperrklinke von Hand betätigt werden.
  2. 2. Das Schiebestück kann zur Lösung der Sperrklinke mittels eines gesonderten Bowdenzugs betätigt werden.
  3. 3. Das Schiebestück kann zur Lösung der Sperrklinke mittels eines Betätigungshebels betätigt werden. Ein solcher Betätigungshebel ist beispielsweise fest auf der Welle des jeweiligen beweglichen Möbelteils angeordnet und rotiert gemeinsam mit dieser. Dabei kann der Betätigungshebel so eingestellt werden, dass im abgesenkten Zustand des jeweiligen Möbelteils das Schiebestück derart verschoben wird, dass die Sperrklinke von dem Rastelement gelöst wird und die Klauenkupplung automatisch wieder in ihre geschlossene Stellung zurückkehrt.
  4. 4. Das Schiebestück zur Lösung der Sperrklinke kann auch mittels eines Kontaktstiftes betätigt werden, der in der nach unten gefahrenen Stellung des jeweiligen beweglichen Möbelteils niedergedrückt wird, wobei der Kontaktstift über eine Hebelkette mit dem Schiebestück verbunden ist und dieses beim Niederdrücken betätigt.
To close the jaw clutch after lowering the movable furniture parts are various options available, where it only matters to solve the pawl of the blocking slide with the sliding piece. This can be done as follows:
  1. 1. The sliding piece can be operated to release the pawl by hand.
  2. 2. The sliding piece can be operated to release the pawl by means of a separate Bowden cable.
  3. 3. The sliding piece can be actuated to release the pawl by means of an actuating lever. Such an actuating lever is for example fixedly arranged on the shaft of the respective movable furniture part and rotates together with this. In this case, the operating lever be adjusted so that in the lowered state of the respective furniture part, the sliding piece is moved so that the pawl is released from the locking element and the jaw clutch automatically returns to its closed position.
  4. 4. The sliding piece for releasing the pawl can also be actuated by means of a contact pin which is depressed in the downwardly driven position of the respective movable furniture part, wherein the contact pin is connected via a lever chain with the sliding piece and actuates this when depressing.

Die Konstruktion der erfindungsgemäßen Vorrichtung kann im Einzelnen so gestaltet sein, dass die Sperrklinke in Richtung auf ihre Sperrstellung, bei der sie hinter dem Rastelement des Blockierschiebers einrastbar ist, mittels einer Feder vorgespannt ist. Dadurch gelangt die Sperrklinke bei einer Bewegung des Blockierschiebers in die Öffnungsstellung der Klauenkupplung automatisch in ihre Sperrstellung.The construction of the device according to the invention can be designed in detail so that the pawl is biased by a spring in the direction of its blocking position, in which it can be latched behind the latching element of the blocking slide. As a result, the pawl automatically reaches its blocking position upon movement of the blocking slide into the open position of the dog clutch.

Das Schiebestück ist zweckmäßig an parallel zu dem Blockierschieber verschieblich geführt und kann einen vorspringenden Mitnehmer aufweisen, der bei einer Bewegung des Schiebestücks in Richtung zu dem mit der Klauenkupplung verbundenen vorderen Ende des Blockierschiebers die Sperrklinke freigibt, so dass der Blockierschieber, der unter Federvorspannung steht, sich in Richtung auf die geschlossene Stellung der Klauenkupplung bewegen kann.The sliding piece is expediently displaceably guided parallel to the blocking slide and can have a projecting catch which releases the pawl when the sliding piece moves in the direction of the front end of the blocking slide connected to the dog clutch, so that the blocking slide, which is spring-loaded, can move in the direction of the closed position of the dog clutch.

Der Blockierschieber ist vorzugsweise über einen Bowdenzug in Richtung der geöffneten Stellung der Klauenkupplung entgegen der Kraft der erwähnten Zugfeder verschiebbar.The blocking slide is preferably displaceable against the force of the mentioned tension spring via a Bowden cable in the direction of the open position of the dog clutch.

Ferner kann der Blockierschieber in Axialrichtung der Gewindespindel verschieblich relativ zu dem Gehäuse geführt sein.Furthermore, the blocking slide can be displaceably guided relative to the housing in the axial direction of the threaded spindle.

Eine besonders zweckmäßige Konstruktion besteht darin, dass das an dem Blockierschieber vorgesehene Rastelement als vorspringende Rastnase ausgebildet ist, mit der die Sperrklinke auf sehr einfache Weise betätigt werden kann.A particularly useful construction is that provided on the blocking slide locking element is designed as a protruding latching lug, with which the pawl can be operated in a very simple manner.

Die Sperrklinke, die hinter dem Rastelement bzw. der Rastnase des Blockierschiebers einrastbar ist, ist zweckmäßig schwenkbar an dem Gehäuse befestigt.The pawl, which can be latched behind the latching element or the latching lug of the blocking slide, is expediently mounted pivotably on the housing.

Das Schiebestück kann parallel zu dem Blockierschieber verschieblich geführt sein, wodurch eine sehr einfache und schlanke Konstruktion möglich ist.The sliding piece can be guided displaceably parallel to the blocking slide, whereby a very simple and slim design is possible.

Die Erfindung ist in der Zeichnung beispielhaft dargestellt und im Nachfolgenden im Einzelnen anhand der Zeichnung beschrieben. Es zeigen:

Fig. 1:
die perspektivische Ansicht eines elektromotorischen Linearantriebs in Form eines Doppelantriebs,
Fig. 2:
in vergrößerter Darstellung den in Fig. 1 dargestellten linken Bereich des Doppelantriebs mit geschlossener Kupplung, wobei die Gehäuseteile weggelassen worden sind und
Fig. 3;
die gleiche Ansicht wie Fig. 2 mit geöffneter Kupplung.
The invention is illustrated by way of example in the drawing and described in detail below with reference to the drawing. Show it:
Fig. 1:
the perspective view of an electromotive linear drive in the form of a double drive,
Fig. 2:
in an enlarged view the in Fig. 1 shown left portion of the double drive with closed clutch, wherein the housing parts have been omitted and
Fig. 3;
the same view as Fig. 2 with open clutch.

In Fig. 1 der Zeichnung ist eine Gesamtansicht eines elektromotorischen Linearantriebs in Form eines Doppelantriebs 1 dargestellt. Die wesentlichen Teile des Antriebs sind dabei von einem Gehäuse 2 umschlossen.In Fig. 1 The drawing shows an overall view of an electromotive linear drive in the form of a double drive 1 is shown. The essential parts of the drive are enclosed by a housing 2.

Aus dem Gehäuse 2 ragen beidseitig je eine Welle 3 bzw. 4 heraus, die über jeweilige rechtwinklig daran befestigte Tragschenkel 5 bzw. 6 entsprechende in der Zeichnung nicht dargestellte beweglich gelagerte Teile von Liege- und/oder Sitzmöbeln anheben und absenken.From the housing 2 protrude on both sides in each case a shaft 3 and 4, respectively, lifting and lowering via respective support legs 5 or 6 at right angles thereto, not shown in the drawing, movably mounted parts of reclining and / or seating furniture.

Der in Fig. 1 dargestellte Doppelantrieb ist beispielsweise für ein Krankenbett vorgesehen, wobei die Welle 3 mit den Tragschenkeln 5 das Kopfteil anhebt und absenkt, während die Welle 4 mit den Tragschenkeln 6 zur Betätigung des Fußteils vorgesehen ist.The in Fig. 1 shown double drive is for example provided for a hospital bed, wherein the shaft 3 with the support legs 5, the head part raises and lowers, while the shaft 4 is provided with the support legs 6 for actuating the foot part.

Außen an dem Doppelantrieb 1 ist mittig ein Schaltergehäuse 7 und links daneben ein Abdeckgehäuse 8 angeordnet, in welchem eine Notfall-Schalteinrichtung untergebracht ist.Outside of the double drive 1 is centrally a switch housing 7 and the left next to a cover housing 8 is arranged, in which an emergency switching device is housed.

Die Notfall-Schalteinrichtung dient dazu, das Kopfteil mittels der Welle 3 und den Tragschenkeln 5 bei geöffneter Kupplung schnell und sicher durch die eigene Schwerkraft abzusenken.The emergency switching device serves to quickly and safely lower the head part by means of the shaft 3 and the support legs 5 with the clutch open by its own gravity.

Ein gleicher Mechanismus könnte auch für das Fußteil vorgesehen sein.A similar mechanism could also be provided for the foot part.

In Fig. 2 sind sämtliche Gehäuseteile 2, 7 und 8 wegegelassen, so dass der für das Kopfteil vorgesehene linke Antriebsstrang mit allen seinen Einzelteilen sichtbar wird.In Fig. 2 are all housing parts 2, 7 and 8 omitted, so that provided for the head part left drive train with all its individual parts is visible.

Der für das Kopfteil vorgesehene Antriebsstrang besteht aus einem Elektromotor 7, einem diesem nachgeschaltetem Reduziergetriebe in Form eines Schneckenradgetriebes 10 sowie einer von diesem antreibbaren Gewindespindel 11 zur Verschiebung eines Hubelements 12. Das Hubelement 12 betätigt dabei einen an der Welle 3 befestigten Druckhebel 13, so dass bei einer Axialverschiebung des Hubelements 12 die Welle 3 gedreht wird. Je nach der Bewegungsrichtung des Hubelements 12 wird das Kopfteil durch die Schwenkbewegung der Welle 3 angehoben oder abgesenkt.The drive train provided for the head part consists of an electric motor 7, a reduction gear downstream of the latter in the form of a worm gear 10 and a threaded spindle 11 drivable by the latter for displacing a lifting element 12. The lifting element 12 actuates a pressure lever 13 attached to the shaft 3 so that at an axial displacement of the lifting element 12, the shaft 3 is rotated. Depending on the direction of movement of the lifting element 12, the head part is raised or lowered by the pivoting movement of the shaft 3.

In dem Antriebsstrang ist zwischen dem Schneckenradgetriebe 10 und der Gewindespindel 11 eine Klauenkupplung 14 vorgesehen, die mittels einer Schaltgabel 15 geöffnet und geschlossen werden kann.In the drive train, a dog clutch 14 is provided between the worm gear 10 and the threaded spindle 11, which can be opened and closed by means of a shift fork 15.

Der Schaltvorgang erfolgt im Normalbetrieb über einen in dem Schaltergehäuse 7 gelagerten Schalter 16, wie er beispielsweise in der älteren Patentanmeldung DE 10 2012 211 508.0 beschrieben ist.The switching process takes place in normal operation via a in the Switch housing 7 mounted switch 16, as he, for example, in the earlier patent application DE 10 2012 211 508.0 is described.

Für einen Notfallbetrieb, in welchem beispielsweise bei einem Krankenbett das Kopfteil sehr schnell abgesenkt werden soll, oder auch bei Stromausfall bzw. eines Defekts im Antriebsstrang ist ein gesondert betätigbarer Blockiermechanismus 17 vorgesehen, mit welchem die Klauenkupplung 14 in ihrer geöffneten Stellung zuverlässig arretierbar ist. Diese Vorsichtsmaßnahme soll dazu dienen, die an den beiden Kupplungshälften vorgesehenen Klauen während des Notfall-Absenkens zuverlässig voneinander getrennt zu halten, damit diese nicht beschädigt werden.For an emergency operation in which, for example, in a hospital bed headboard is to be lowered very quickly, or even in case of power failure or a defect in the drive train a separately actuable locking mechanism 17 is provided with which the jaw clutch 14 is reliably locked in its open position. This precaution should serve to reliably keep the claws provided on the two coupling halves separate during emergency lowering, so that they are not damaged.

Der Blockiermechanismus 17 weist einen Blockierschieber 18 auf, der relativ zu dem Gehäuse 2 in Längsrichtung der Gewindespindel 11 verschieblich geführt ist. Der Blockierschieber 18 greift dabei in einen von dem Schalter 16 kommenden und mit der Schaltgabel 15 verbundenen Schaltschieber 19 ein. Dabei ist der Blockierschieber 18 in Richtung der geschlossenen Stellung der Kupplung federbelastet, und zwar mittels einer Zugfeder 20, die einerseits an dem Blockierschieber 18 und andererseits an dem Gehäuse 2 befestigt ist.The blocking mechanism 17 has a blocking slide 18, which is displaceably guided relative to the housing 2 in the longitudinal direction of the threaded spindle 11. The blocking slide 18 engages in a coming from the switch 16 and connected to the shift fork 15 slide valve 19 a. In this case, the blocking slide 18 is spring-loaded in the direction of the closed position of the coupling, by means of a tension spring 20, which is fastened on the one hand to the blocking slide 18 and on the other hand to the housing 2.

Der Blockierschieber 18 ist mit einem gesonderten Betätigungsmechanismus 21 entgegen der Federbelastung durch die Zugfeder 20 in Richtung der geöffneten Stellung der Klauenkupplung 14 verschiebbar. Als Betätigungsmechanismus sind in dem in der Zeichnung dargestellten Ausführungsbeispiel zwei Bowdenzüge 22 vorgesehen, die zu bequem zugänglichen Stellen an beiden Seiten des Krankenbetts geführt und von dort aus betätigt werden können.The blocking slide 18 is displaceable with a separate actuating mechanism 21 against the spring load by the tension spring 20 in the direction of the open position of the dog clutch 14. As an actuating mechanism two Bowden cables 22 are provided in the embodiment shown in the drawing, which can be guided to easily accessible locations on both sides of the hospital bed and operated from there.

An dem Blockierschieber 18 ist eine seitlich vorspringende Rastnase 23 vorgesehen, die mit einer schwenkbar an dem Gehäuse 2 befestigten Sperrklinke 24 zusammenwirkt.On the blocking slide 18, a laterally projecting detent 23 is provided, which cooperates with a pawl 24 pivotally mounted on the housing 2.

Im Normalbetrieb nimmt die Sperrklinke 24 eine inaktive Position ein, wie sie in Fig. 2 dargestellt ist.In normal operation, the pawl 24 assumes an inactive position, as in Fig. 2 is shown.

Wenn dagegen bei einer Notfallabsenkung der Blockierschieber 18 über die Bowdenzüge 22 in Fig. 2 nach links verschoben wird, wird die Schaltgabel 15 derart betätigt, dass die Klauenkupplung 14 ihre geöffnete Stellung einnimmt. Bei dieser Konstellation rastet die Sperrklinke 24 in die in Fig. 3 dargestellte Position ein, bei der sie hinter die Rastnase 23 des Blockierschiebers 18 greift, so dass dieser daran gehindert ist, sich in der Zeichnung nach rechts in eine Position zu bewegen, in der die Klauenkupplung 14 geschlossen ist.If, however, in an emergency lowering of the blocking slide 18 via the Bowden cables 22 in Fig. 2 is shifted to the left, the shift fork 15 is actuated such that the dog clutch 14 assumes its open position. In this constellation, the pawl 24 snaps into the in Fig. 3 shown position, in which it engages behind the detent 23 of the locking slide 18 so that it is prevented from moving in the drawing to the right in a position in which the dog clutch 14 is closed.

Zu dem Gesamtmechanismus gehört ferner ein relativ zu dem Gehäuse 2 bewegliches Schiebestück 25, mit welchem die Sperrklinke 24 im abgesenkten Zustand des entsprechenden Möbelteils von der Rastnase 23 lösbar ist, um den Blockierschieber 18 freizugeben, damit dieser sich wieder in der Zeichnung nach rechts bewegen kann, um die Klauenkupplung 14 zu schließen.To the overall mechanism further includes a relative to the housing 2 movable sliding piece 25, with which the pawl 24 in the lowered state of the corresponding furniture part of the latch 23 is releasable to release the blocking slide 18 so that it can move back to the right in the drawing to close the dog clutch 14.

Das Schiebestück 25 ist parallel zu dem Blockierschieber 18 geführt und weist einen vorspringenden Mitnehmer 26 auf, der bei einer Bewegung des Schiebestücks (25) in der Zeichnung nach rechts, also in Richtung zu dem mit der Klauenkupplung 14 verbundenen vorderen Ende des Blockierschiebers 18, gegen die Sperrklinke 24 drückt. Diese wird dadurch entgegen einer durch eine Zugfeder 27 aufgebrachten Zugspannung im Uhrzeigersinn verschwenkt und dadurch von der Rastnase 23 des Blockierschiebers 18 getrennt, so dass der Blockierschieber 18 durch die Federbelastung der Zugfeder 20 nach rechts bewegt und die Klauenkupplung wieder geschlossen wird.The sliding piece 25 is guided parallel to the blocking slide 18 and has a projecting driver 26, which in a movement of the sliding piece (25) in the drawing to the right, ie towards the front end of the blocking slide 18 connected to the dog clutch 14, against the pawl 24 presses. This is thereby pivoted against a tension applied by a tension spring 27 clockwise and thereby separated from the locking lug 23 of the blocking slide 18, so that the blocking slide 18 is moved by the spring load of the tension spring 20 to the right and the dog clutch is closed again.

Die Bewegung des Schiebestücks 25 kann auf verschiedene Art und Weise erreicht werden. Wichtig ist lediglich, dass das Schiebestück 25 dann, wenn das entsprechende Möbelteil komplett abgesenkt worden ist, anschließend in der Zeichnung nach rechts bewegt wird, um die Sperrklinke 24 zu betätigen und die Klauenkupplung 14 zu schließen, damit der Antriebsstrang wieder betriebsbereit ist und das entsprechende Möbelteil über den Motor 7 erneut angehoben werden kann.The movement of the sliding piece 25 can be achieved in various ways. It is only important that the sliding piece 25, if the corresponding furniture part completely has been lowered, then moved in the drawing to the right to actuate the pawl 24 and the jaw clutch 14 to close, so that the drive train is ready for use again and the corresponding furniture part can be raised again via the motor 7.

Wie aus Fig. 1 hervorgeht, ist auf der Welle 3 ein Betätigungshebel 28 drehfest angebracht, der, wenn die Tragschenkel 5 ihre nach unten geschwenkte Position einnehmen, das Schiebestück 25 betätigen. In Fig. 1 ragt das Ende des Schiebestücks 25 seitlich aus dem Gehäuse 2 heraus und wird beim kompletten Absenken der Tragschenkel 5 in der Zeichnung nach rechts bewegt, so dass der Mitnehmer 26 die Sperrklinke 24 aus ihrer in Fig. 3 dargestellten Sperrstellung, bei der sie hinter der Rastnase 23 des Blockierschiebers 18 liegt, in die in Fig. 2 dargestellte inaktive Position verschwenkt wird. In dieser Position der Sperrklinke bewegt sich der Blockierschieber 18 mittels der Zugfeder 20 nach rechts, wodurch die Klauenkupplung 14 wieder ihre geschlossen Position einnehmen kann.How out Fig. 1 As can be seen, an actuating lever 28 is rotatably mounted on the shaft 3, which, when the support legs 5 assume their pivoted down position, the sliding piece 25 actuate. In Fig. 1 the end of the sliding piece 25 protrudes laterally out of the housing 2 and is moved to the right when completely lowering the support legs 5 in the drawing so that the driver 26 releases the pawl 24 from its in Fig. 3 illustrated blocking position in which it is behind the locking lug 23 of the blocking slide 18, in the in Fig. 2 shown inactive position is pivoted. In this position of the pawl, the blocking slide 18 moves by means of the tension spring 20 to the right, whereby the jaw clutch 14 can again assume their closed position.

Alternativ wäre es aber auch möglich, das Schiebestück 25 zur Lösung der Sperrklinke 24 von Hand zu betätigen, wobei dann allerdings auf den Automatismus verzichtet werden müsste, dass sich die Kupplung nach dem Absenken des entsprechenden Möbelteils selbstständig wieder schließt.Alternatively, it would also be possible to actuate the sliding piece 25 to solve the pawl 24 by hand, in which case, however, would have to dispense with the automatic that the clutch closes automatically after lowering the corresponding furniture part again.

Bei einem anderen in der Zeichnung nicht dargestellten Ausführungsbeispiel kann die Sperrklinke 24 mittels eines gesonderten Bowdenzugs betätigt werden.In another embodiment, not shown in the drawing, the pawl 24 can be actuated by means of a separate Bowden cable.

Schließlich ist es auch möglich, das Schiebestück 25 zur Lösung der Sperrklinke 24 mittels eines Kontaktstiftes oder sonstigen Auslöseelements zu betätigen, der bzw. das in der nach unten gefahrenen Stellung des jeweiligen beweglichen Möbelteils niedergedrückt wird, wobei das Schiebestück 25 dann über eine entsprechende Hebelkette selbsttätig verschoben wird.Finally, it is also possible to actuate the sliding piece 25 to release the pawl 24 by means of a contact pin or other trigger element, which is depressed in the downwardly driven position of the respective movable furniture part, wherein the sliding piece 25 then automatically via a corresponding lever chain postponed becomes.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Doppelantriebdouble drive
22
Gehäusecasing
33
Wellewave
44
Wellewave
55
Tragschenkelsupporting leg
66
Tragschenkelsupporting leg
77
Schaltergehäuseswitch housing
88th
Abdeckgehäusecover housing
99
Elektromotorelectric motor
1010
Schneckenradgetriebeworm gear
1111
Gewindespindelscrew
1212
Hubelementlifting
1313
Druckhebelpressure lever
1414
Klauenkupplungclaw clutch
1515
Schaltgabelshift fork
1616
Schalterswitch
1717
Blockiermechanismusblocking mechanism
1818
Blockierschieberblocking slide
1919
Schaltschieberswitch slide
2020
Zugfedermainspring
2121
Betätigungsmechanismusactuating mechanism
2222
Bowdenzügecables
2323
Rastnaselocking lug
2424
Sperrklinkepawl
2525
Schiebestücksliding piece
2626
Mitnehmertakeaway
2727
Zugfedermainspring
2828
Betätigungshebelactuating lever

Claims (14)

  1. Apparatus for controlling an electric motor-actuated linear drive in the form of a furniture drive, for adjusting moveably mounted parts of lying and seating furniture, comprising
    - at least one drive train which is disposed in a housing (2) and comprising an electric motor (9), a reducing transmission connected downstream thereof and a threaded spindle (11) driveable by the transmission for displacement of a stroke element (12) for raising and lowering the respective moveable furniture part,
    - a switchable claw coupling (14) which is provided in the drive train and which is held in engagement by means of a spring mechanism,
    - a switching mechanism equipped with a switching element for opening and closing the claw coupling (14), and
    - a separately actuable blocking mechanism (17) with which the claw coupling (14) can be arrested in its opened position,
    characterised in that
    - the blocking mechanism (17) has a blocking slider (18) which is guided displaceably relative to the housing (2) and is connected directly or indirectly to the switching element and is spring-loaded in the direction of the closed position of the switching element,
    - the blocking slider (18) is displaceable with a separate actuating mechanism (21) in opposition to the spring loading in the direction of the opened position of the claw coupling (14),
    - a latching element is provided on the blocking slider (18),
    - fixed moveably to the housing (2) is a locking pawl (24) which is latchable behind the latching element of the blocking slider (18) when the slider has reached its position corresponding to the opened position of the claw coupling (14), and
    - in addition there is provided a sliding portion (25) which is moveable relative to the housing (2) and with which the locking pawl (24) is releasable from the latching element in the lowered condition of the corresponding furniture part.
  2. Apparatus according to claim 1 characterised in that the locking pawl (24) is biased by means of a tension spring (22) in a direction towards its locking position in which it is latchable behind the latching element of the blocking slider (18).
  3. Apparatus according to claim 1 or claim 2 characterised in that the sliding portion (25) is guided displaceably parallel to the blocking slider (18) and has a projecting entrainment member (26) which releases the locking pawl (24) upon a movement of the sliding portion (25) in the direction towards the front end of the blocking slider (18), which end is connected to the claw coupling (14).
  4. Apparatus according to one of claims 1 to 3 characterised in that the blocking slider (18) is displaceable by way of at least one Bowden cable (22) in the direction of the opened position of the claw coupling (24) against the force of a tension spring (20).
  5. Apparatus according to one of claims 1 to 4 characterised in that the blocking slider (18) is guided displaceably relative to the housing (2) in the axial direction of the threaded spindle (11).
  6. Apparatus according to one of claims 1 to 5 characterised in that the latching element provided on the blocking slider (18) is in the form of a projecting latching nose (23).
  7. Apparatus according to one of claims 1 to 6 characterised in that the locking pawl (24) which is latchable behind the latching element of the blocking slider is fixed pivotably to the housing (2).
  8. Apparatus according to one of claims 1 to 7 characterised in that the sliding portion (25) is guided displaceably parallel to the blocking slider (18).
  9. Apparatus according to one of claims 1 to 8 characterised in that the sliding portion (25) is actuable by hand to release the locking pawl (24).
  10. Apparatus according to one of claims 1 to 8 characterised in that the sliding portion (25) is actuable by means of a separate Bowden cable to release the locking pawl (24).
  11. Apparatus according to one of claims 1 to 8 characterised in that the sliding portion (25) is actuable by means of an actuating lever (28) for releasing the locking pawl (24).
  12. Apparatus according to claim 11 characterised in that the actuating lever (28) is arranged fixedly on the shaft (3) of the respective moveable furniture part and rotates jointly with said shaft and the actuating lever (28) is so adjusted that in the lowered condition of the respective furniture part the sliding portion (25) is displaced in such a way that the locking pawl (24) is released from the latching nose (23) and the claw coupling (14) moves back into its closed position again.
  13. Apparatus according to one of claims 1 to 8 characterised in that the sliding portion (25) for release of the locking pawl (24) is actuable by means of a contact pin which is depressed in the downwardly moved position of the respective moveable furniture part.
  14. Apparatus according to claim 13 characterised in that the contact pin is connected by way of a lever chain to the sliding portion (25) and actuates the sliding portion upon being depressed.
EP14179649.0A 2013-09-09 2014-08-04 Device for controlling a furniture drive Active EP2845520B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013217920.0A DE102013217920A1 (en) 2013-09-09 2013-09-09 Device for controlling a furniture drive

Publications (2)

Publication Number Publication Date
EP2845520A1 EP2845520A1 (en) 2015-03-11
EP2845520B1 true EP2845520B1 (en) 2015-12-02

Family

ID=51265566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14179649.0A Active EP2845520B1 (en) 2013-09-09 2014-08-04 Device for controlling a furniture drive

Country Status (3)

Country Link
EP (1) EP2845520B1 (en)
JP (1) JP5955359B2 (en)
DE (1) DE102013217920A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2903048T3 (en) * 2016-04-29 2022-03-30 De Werth Group Ag Double electromotor drive

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4174547A (en) * 1978-02-08 1979-11-20 Wetzler Justin J Hospital bed structure
JPH0541533U (en) * 1991-11-12 1993-06-08 パラマウントベツド株式会社 Floor undulation mechanism with emergency release means
DE29604293U1 (en) * 1996-03-08 1997-07-03 Dewert Antriebs- und Systemtechnik GmbH & Co KG, 32278 Kirchlengern Electromotive furniture drive
DE10200169A1 (en) * 2002-01-04 2003-07-17 Cimosys Ag Goldingen Furniture drive for adjusting parts of a piece of furniture relative to one another
DE20214426U1 (en) * 2002-09-17 2004-02-19 Cimosys Ag Electromotive furniture drive for adjusting parts of a piece of furniture relative to one another
DE102004006368A1 (en) * 2004-02-09 2005-08-25 Ludwig Ehrhardt Gmbh linear unit
DE202005020266U1 (en) 2005-12-23 2007-04-26 Dewert Antriebs- Und Systemtechnik Gmbh Electromotive linear drive
JP5414461B2 (en) * 2009-10-30 2014-02-12 株式会社ミツバ Linear actuator
DE102012219113A1 (en) * 2011-11-09 2013-05-16 Dewertokin Gmbh Electromotive linear drive, in particular for adjusting reclining and seating furniture
DE202011110086U1 (en) * 2011-11-09 2012-12-18 Dewertokin Gmbh Electromotive linear drive, in particular for adjusting reclining and seating furniture
DE102012211508A1 (en) 2012-07-03 2014-01-09 Dewertokin Gmbh Device for controlling a furniture drive

Also Published As

Publication number Publication date
JP2015091297A (en) 2015-05-14
DE102013217920A1 (en) 2015-03-12
EP2845520A1 (en) 2015-03-11
JP5955359B2 (en) 2016-07-20

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