EP0088956B1 - Dental chair - Google Patents

Dental chair Download PDF

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Publication number
EP0088956B1
EP0088956B1 EP83102086A EP83102086A EP0088956B1 EP 0088956 B1 EP0088956 B1 EP 0088956B1 EP 83102086 A EP83102086 A EP 83102086A EP 83102086 A EP83102086 A EP 83102086A EP 0088956 B1 EP0088956 B1 EP 0088956B1
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EP
European Patent Office
Prior art keywords
chair
seat
roller
articulated
seat frame
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
Application number
EP83102086A
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German (de)
French (fr)
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EP0088956A3 (en
EP0088956A2 (en
Inventor
Klaus Stöckl
Reinhard Engert
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Siemens AG
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Siemens AG
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Publication of EP0088956A2 publication Critical patent/EP0088956A2/en
Publication of EP0088956A3 publication Critical patent/EP0088956A3/en
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Publication of EP0088956B1 publication Critical patent/EP0088956B1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G15/00—Operating chairs; Dental chairs; Accessories specially adapted therefor, e.g. work stands
    • A61G15/02—Chairs with means to adjust position of patient; Controls therefor

Definitions

  • the invention relates to a dental patient chair with a chair lower part and a chair and a pivotable articulated backrest containing the upper part of the chair, arranged between the lower and upper part of the chair, designed as a straight guide, by means of which a seat frame supporting the upper part of the chair can be moved along the lower part of the chair , Means are provided which, when the backrest is inclined, on the one hand shift the seat in the longitudinal direction of the chair relative to the lower part of the chair and, on the other hand, tilt about a transverse axis with the aid of a run-off roller supported on a running track.
  • the upper part of the chair is positively guided in the sense of the described combined movement by means of a rigid handlebar designed as an armrest, which is articulated on the one hand to the backrest and on the other hand to the lower part of the chair.
  • the object of the present invention is; to improve a dental patient chair of the type mentioned at the outset in such a way that the above-described combined movement can be achieved without lateral armrests or similar steering linkages attached to the outside of the chair and interfering with free access to the chair, but nevertheless adequate stability without arrangement a particularly torsion-resistant support frame is given.
  • the pivot bearing for the backrest is arranged in a stationary manner on the seat frame, approximately in the region of the hip joint of a person sitting in the chair, that the bearing part on which the backrest is arranged is connected to the backrest in an angularly rigid manner , downward opening into the seat frame, on which a pull / push rod is articulated, and that a two lever arms roller lever is articulated on the seat frame, on one arm the pull / push rod is articulated and on the other arm the roller is mounted, which is supported on the arranged on the lower part of the chair and determining the tilting movement of the seat.
  • the construction according to the invention has the advantage that, after the swivel bearing for the backrest lies approximately in the area of the hip joint of a person sitting in the chair, there is practically no “pull-out effect”, that the backrest is practically self-supporting, therefore does not require a torsionally rigid support frame, and that both sides of the chair are free of a steering or armrest linkage.
  • Another advantage of the construction according to the invention can be seen in the fact that the backrest has no mechanical coupling in the direction of the steep position, that is to say that it can be raised freely in each inclination phase and thus complies with the required safety regulations.
  • the proposed construction for guiding the upper part of the chair also has the advantage that no counterweights are to be provided in the area of the leg rest, as is the case with known chairs for safety reasons, in order to avoid possible tilting movements in extreme chair positions.
  • Fig. 1 shows a dental patient chair in a side view with a base part 1, a height adjustment device 2, not shown, and a support frame 3 existing chair lower part and a chair part formed from the seat 4 and backrest 5.
  • Seat 4 and backrest 5 are connected to one another by means of a joint 6.
  • the joint 6 is present on both sides of the chair (FIG. 2) and is located approximately in the area of the hip joint of a person sitting in the chair.
  • the two joints 6 each consist of a pin 8 arranged on the seat frame 7 and a bearing part 9 pivotable about this pivotable bearing part 9, on the one hand, a fastening part 10 for the backrest 5 and, on the other hand, an extension 11 which plunges downward into the seat frame 7 are fastened at an angle-resistant manner.
  • a pull / push rod 13 is articulated by means of a joint 12, at the free end of which a lever arm 15 of a roller lever 16 is articulated by means of a joint 14.
  • the roller lever 16 is fixed in place on the seat frame 7 by means of a joint 17; On the second lever arm 18, a roller 19 is mounted, which is supported on a track 20 fastened to the support frame 3 of the lower part of the chair.
  • the two joints 14, 17 and the roller 19 form an isosceles triangle.
  • the dimensioning of the lever arms as well as the arrangement of the bearing point and the inclination of the concavely curved plane of the raceway 20 are such that when the backrest 5 is inclined, the seat 4 is moved in the desired manner in the direction of the arrow indicated in the image to the right and at the same time the legrest is slightly raised towards the backrest. The guidance necessary for this is explained in more detail with reference to FIG. 4.
  • Guide rods 21, 22 are arranged on the seat frame 7 on both sides.
  • the mounting blocks required for this are designated by 23.
  • the guide rods 21, 22 are arranged in pairs (21, 21 a; 22, 22a) and one behind the other.
  • Guide bushings 24, 24a run on the guide rods; 25, 25a, these guide bushes 24, 25 are each articulated by means of a joint 26 (FIG. 3) in brackets 27 on the support frame 3, that is to say on the lower part of the chair.
  • a spindle drive 30 is provided in a manner known per se with a spindle nut 31 and a threaded spindle 32.
  • the spindle drive 30 is suspended from the seat frame 7 by means of trunnions 33 and brackets 34.
  • the spindle nut 31 is also articulated by means of a joint 35 and brackets 36 on the support frame 3, that is to say on the lower part of the chair.
  • the threaded spindle 32 is moved along the spindle nut 31 when the drive 30 is switched on; due to the coupling of the drive to the seat frame 7, the seat 4 is adjusted in the longitudinal direction of the chair.
  • the guide bushes 24, 25 are adjusted along the guide rods 21, 22.
  • the roller 19 runs on the inclined plane of the track 20.
  • the roller is pressed onto the track 20 by the weight of the backrest.
  • the roller lever 16 tilts about the articulation axis 17, with the result that the pull arm 15 / Push rod 13 is moved to the right in the display plane.
  • the seat and leg support are slightly raised when pushed forward.
  • the angle of inclination of the guide rods 21, 22 determines the degree of lifting of the seat and leg support.
  • the arrangement of the guide rods 21, 22 is advantageously in pairs; An embodiment with only a paired arrangement of the rods 21, 21 and only one guide rod in the front area is also conceivable.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)

Description

Die Erfindung bezieht sich auf einen zahnärztlichen Patientenstuhl mit einem Stuhlunterteil und einem einen Sitz und eine schwenkbar daran angelenkte Rückenlehne enthaltenden Stuhloberteil, mit einer zwischen Stuhlunterteil und -oberteil angeordneten, als Geradführung ausgebildeten Verschiebevorrichtung, mittels der ein das Stuhloberteil tragender Sitzrahmen längs des Stuhlunterteiles bewegbar ist, wobei Mittel vorgesehen sind, die bei Neigen der Rückenlehne den Sitz einerseits in Längsrichtung des Stuhles relativ zum Stuhlunterteil verschieben und andererseits mit Hilfe einer sich an einer Laufbahn aufstützenden Ablaufrolle um eine Querachse kippen.The invention relates to a dental patient chair with a chair lower part and a chair and a pivotable articulated backrest containing the upper part of the chair, arranged between the lower and upper part of the chair, designed as a straight guide, by means of which a seat frame supporting the upper part of the chair can be moved along the lower part of the chair , Means are provided which, when the backrest is inclined, on the one hand shift the seat in the longitudinal direction of the chair relative to the lower part of the chair and, on the other hand, tilt about a transverse axis with the aid of a run-off roller supported on a running track.

Bei einem solchen bekannten Stuhl (DE-C-22 26 572) sind am Sitzrahmen zwei parallel zueinander angeordnete Führungsstangen befestigt, auf denen durch einen Querträger miteinander verbundene Hülsen als Gegenglieder verschiebbar gelagert sind. Die Hülsen sind mittels Lager am Stuhlunterteil angelenkt, so dass der Sitz bei einer Längsbewegung die eingangs erwähnte Kippbewegung ausführen kann. Ausgehend von einer einer Sitzposition entsprechend aufgerichteten Rückenlehne wird bei einem Neigen der Rückenlehne das gesamte Stuhloberteil nach vorne, also zum Fussende des Stuhles hin, bewegt. Gleichzeitig wird das Fussende der Rükkenlehne hin leicht gekippt. Bei Wiederaufrichten der Rückenlehne erfolgt eine umgekehrte Bewegung.In such a known chair (DE-C-22 26 572), two guide rods arranged parallel to one another are fastened to the seat frame, on which sleeves which are connected to one another by a cross member are slidably mounted as counter-members. The sleeves are articulated by means of bearings on the lower part of the chair, so that the seat can perform the aforementioned tilting movement during a longitudinal movement. Starting from a backrest which is erected in accordance with a seating position, the entire upper part of the chair is moved forward, that is to say toward the foot end of the chair, when the backrest is inclined. At the same time, the foot end of the backrest is tilted slightly. When the backrest is straightened up, the movement is reversed.

Die Zwangsführung des Stuhloberteiles im Sinne der geschilderten kombinierten Bewegung erfolgt bei dem bekannten Stuhl mittels eines als Armlehne ausgebildeten starren Lenkers, der einerseits mit der Rückenlehne und andererseits mit dem Stuhlunterteil gelenkig verbunden ist.In the known chair, the upper part of the chair is positively guided in the sense of the described combined movement by means of a rigid handlebar designed as an armrest, which is articulated on the one hand to the backrest and on the other hand to the lower part of the chair.

Um der Forderung nach einer besseren Zugänglichkeit zum Patientenstuhl, insbesondere beim Ein- und Aussteigen, nachzukommen, wurde schon vorgeschlagen, an der Ein- und Ausstiegsseite des Stuhles die Armlehne wegzulassen bzw. diese wegschwenk- oder klappbar auszubilden, und die andere Seite für die Zwangsführung vorzusehen. Eine solche einseitige Anlenkung der Rückenlehne ist hinsichtlich der Kraftübertragung problematisch; will man eine ausreichende Stabilität erzielen, ist unter anderem ein sehr aufwendiger verwindungssteifer Tragrahmen für Sitz- und Rückenlehne vorzusehen.In order to meet the demand for better access to the patient chair, especially when getting in and out, it has already been proposed to omit the armrest on the entry and exit side of the chair, or to design it to be pivotable or foldable, and the other side for the forced guidance to provide. Such one-sided articulation of the backrest is problematic with regard to the power transmission; if you want to achieve sufficient stability, a very complex torsion-resistant support frame for the seat and backrest must be provided.

Aufgabe der vorliegenden Erfindung ist es; einen zahnärztlichen Patientenstuhl der eingangs genannten Gattung dahingehend zu verbessern, dass die oben erläuterte kombinierte Bewegung erzielt werden kann, ohne dass seitliche Armlehnen oder ähnliche, aussen am Stuhl angebrachte und den freien Zugang zum Stuhl störende Lenkgestänge vorzusehen sind, dennoch aber eine ausreichende Stabilität ohne Anordnung eines besonders verwindungssteifen Tragrahmens gegeben ist.The object of the present invention is; to improve a dental patient chair of the type mentioned at the outset in such a way that the above-described combined movement can be achieved without lateral armrests or similar steering linkages attached to the outside of the chair and interfering with free access to the chair, but nevertheless adequate stability without arrangement a particularly torsion-resistant support frame is given.

Zur Lösung der gestellten Aufgabe wird gemäss der Erfindung vorgeschlagen, dass das Schwenklager für die Rückenlehne ortsfest am Sitzrahmen etwa im Bereich des Hüftgelenkes einer im Stuhl sitzenden Person angeordnet ist, dass der Lagerteil, an dem die Rückenlehne angeordnet ist, einen winkelsteif mit der Rückenlehne verbundenen, nach unten in den Sitzrahmen mündenden Fortsatz aufweist, an dem eine Zug-/ Druckstange angelenkt ist, und dass am Sitzrahmen ein zwei Hebelarme aufweisender Rollenhebel angelenkt ist, an dessen einem Arm die Zug-/ Druckstange angelenkt ist und an dessen anderem Arm die Laufrolle gelagert ist, welche sich auf der am Stuhlunterteil angeordneten und die Kippbewegung des Sitzes bestimmenden Laufbahn abstützt. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen enthalten.To achieve the stated object, it is proposed according to the invention that the pivot bearing for the backrest is arranged in a stationary manner on the seat frame, approximately in the region of the hip joint of a person sitting in the chair, that the bearing part on which the backrest is arranged is connected to the backrest in an angularly rigid manner , downward opening into the seat frame, on which a pull / push rod is articulated, and that a two lever arms roller lever is articulated on the seat frame, on one arm the pull / push rod is articulated and on the other arm the roller is mounted, which is supported on the arranged on the lower part of the chair and determining the tilting movement of the seat. Advantageous refinements and developments of the invention are contained in the dependent claims.

Die erfindungsgemässe Konstruktion hat den Vorteil, dass, nachdem das Schwenklager für die Rückenlehne etwa im Bereich des Hüftgelenkes einer im Stuhl sitzenden Person liegt, praktisch kein «Auszieheffekt» vorhanden ist, dass weiterhin die Rückenlehne praktisch selbsttragend ist, demnach keinen verwindungssteifen Tragrahmen erfordert, und dass beide Stuhlseiten aussen frei sind von einem Lenk- oder Armlehnengestänge. Ein weiterer Vorteil der erfindungsgemässen Konstruktion ist darin zu sehen, dass die Rückenlehne in Richtung Steilstellung keine mechanische Koppelung aufweist, demnach in jeder Neigungsphase frei anhebbar ist und somit den geforderten Sicherheitsbestimmungen entspricht.The construction according to the invention has the advantage that, after the swivel bearing for the backrest lies approximately in the area of the hip joint of a person sitting in the chair, there is practically no “pull-out effect”, that the backrest is practically self-supporting, therefore does not require a torsionally rigid support frame, and that both sides of the chair are free of a steering or armrest linkage. Another advantage of the construction according to the invention can be seen in the fact that the backrest has no mechanical coupling in the direction of the steep position, that is to say that it can be raised freely in each inclination phase and thus complies with the required safety regulations.

Die vorgeschlagene Konstruktion zur Führung des Stuhloberteiles hat ausserdem den Vorzug, dass keinerlei Gegengewichte im Bereich der Beinauflage vorzusehen sind, wie dies bei bekannten Stühlen aus Sicherheitsgründen der Fall ist, um evtl. Kippbewegungen bei extremen Stuhlpositionen zu vermeiden.The proposed construction for guiding the upper part of the chair also has the advantage that no counterweights are to be provided in the area of the leg rest, as is the case with known chairs for safety reasons, in order to avoid possible tilting movements in extreme chair positions.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. Es zeigen:

  • Fig. einen zahnärztlichen Patientenstuhl in einer Seitenansicht,
  • Fig. 2 den Stuhl nach Fig. 1 in Frontansicht,
  • Fig. 3 den Stuhl in einer vereinfachten Darstellung im Bereich des Sitzes im Längsschnitt,
  • Fig. 4 den Stuhl in einer Draufsicht im Schnitt.
An embodiment of the invention is explained below with reference to the drawing. Show it:
  • 1 shows a dental patient chair in a side view,
  • 2 the chair of FIG. 1 in front view,
  • 3 the chair in a simplified representation in the area of the seat in longitudinal section,
  • Fig. 4 the chair in a plan view in section.

Die Fig. 1 zeigt einen zahnärztlichen Patientenstuhl in einer Seitenansicht mit einem aus Basisteil 1, einer nicht näher dargestellten Höhenverstellvorrichtung 2 sowie einem Tragrahmen 3 bestehenden Stuhlunterteil und einem aus Sitz 4 und Rückenlehne 5 gebildeten Stuhloberteil. Sitz 4 und Rückenlehne 5 sind mittels Gelenk 6 miteinander verbunden. Das Gelenk 6 ist beidseitig des Stuhles vorhanden (Fig. 2) und befindet sich etwa im Bereich des Hüftgelenkes einer im Stuhl sitzenden Person.Fig. 1 shows a dental patient chair in a side view with a base part 1, a height adjustment device 2, not shown, and a support frame 3 existing chair lower part and a chair part formed from the seat 4 and backrest 5. Seat 4 and backrest 5 are connected to one another by means of a joint 6. The joint 6 is present on both sides of the chair (FIG. 2) and is located approximately in the area of the hip joint of a person sitting in the chair.

Wie aus Fig. 3 und 4 deutlicher hervorgeht, bestehen die beiden Gelenke 6 jeweils aus einem am Sitzrahmen 7 angeordneten Zapfen 8 und einem um diesen schwenkbaren Lagerteil 9. Am schwenkbaren Lagerteil 9 sind einerseits ein Befestigungsteil 10 für die Rückenlehne 5 und andererseits ein nach unten in den Sitzrahmen 7 eintauchender Fortsatz 11 winkelsteif befestigt. Am freien Ende des Fortsatzes 11 ist mittels Gelenk 12 eine Zug-/Druckstange 13 angelenkt, an deren freiem Ende mittels Gelenk 14 der eine Hebelarm 15 eines Rollenhebels 16 angelenkt ist. Der Rollenhebel16 ist mittels Gelenk 17 am Sitzrahmen 7 ortsfest gelagert; am zweiten Hebelarm 18 ist eine Rolle 19 gelagert, die sich auf einer am Tragrahmen 3 des Stuhlunterteiles befestigten Laufbahn 20 abstützt. Die beiden Gelenke 14, 17 und die Rolle 19 bilden ein gleichschenkeliges Dreieck. Die Bemessung der Hebelarme sowie die Anordnung des Lagerpunktes und die Neigung der konkav gewölbten Ebene der Laufbahn 20 sind so getroffen, dass bei einem Neigen der Rückenlehne 5 der Sitz 4 in der gewünschten Weise in Richtung des angegebenen Pfeiles im Bild nach rechts bewegt wird und gleichzeitig die Beinauflage zur Rückenlehne hin leicht angehoben wird. Die hierzu notwendige Führung wird anhand der Fig. 4 näher erläutert.As can be seen more clearly from FIGS. 3 and 4, the two joints 6 each consist of a pin 8 arranged on the seat frame 7 and a bearing part 9 pivotable about this pivotable bearing part 9, on the one hand, a fastening part 10 for the backrest 5 and, on the other hand, an extension 11 which plunges downward into the seat frame 7 are fastened at an angle-resistant manner. At the free end of the extension 11, a pull / push rod 13 is articulated by means of a joint 12, at the free end of which a lever arm 15 of a roller lever 16 is articulated by means of a joint 14. The roller lever 16 is fixed in place on the seat frame 7 by means of a joint 17; On the second lever arm 18, a roller 19 is mounted, which is supported on a track 20 fastened to the support frame 3 of the lower part of the chair. The two joints 14, 17 and the roller 19 form an isosceles triangle. The dimensioning of the lever arms as well as the arrangement of the bearing point and the inclination of the concavely curved plane of the raceway 20 are such that when the backrest 5 is inclined, the seat 4 is moved in the desired manner in the direction of the arrow indicated in the image to the right and at the same time the legrest is slightly raised towards the backrest. The guidance necessary for this is explained in more detail with reference to FIG. 4.

Am Sitzrahmen 7 sind zu beiden Seiten Führungsstangen 21, 22 angeordnet. Die hierzu notwendigen Befestigungsblöcke sind mit 23 bezeichnet. Die Führungsstangen 21, 22 sind paarweise (21, 21 a; 22, 22a) und hintereinander angeordnet. Auf den Führungsstangen laufen Führungsbuchsen 24, 24a; 25, 25a, diese Führungsbuchsen 24, 25 sind jeweils mittels Gelenk 26 (Fig. 3) in Halterungen 27 gelenkig am Tragrahmen 3, also am Stuhlunterteil angelenkt.Guide rods 21, 22 are arranged on the seat frame 7 on both sides. The mounting blocks required for this are designated by 23. The guide rods 21, 22 are arranged in pairs (21, 21 a; 22, 22a) and one behind the other. Guide bushings 24, 24a run on the guide rods; 25, 25a, these guide bushes 24, 25 are each articulated by means of a joint 26 (FIG. 3) in brackets 27 on the support frame 3, that is to say on the lower part of the chair.

Zur Verstellung des Stuhloberteiles ist in an sich bekannter Weise ein Spindelantrieb 30 vorgesehen mit einer Spindelmutter 31 und einer Gewindespindel 32. Der Spindelantrieb 30 ist mittels Lagerzapfen 33 und Halterungen 34 am Sitzrahmen 7 aufgehängt. Die Spindelmutter 31 ist ebenfalls mittels eines Gelenkes 35 und Halterungen 36 am Tragrahmen 3, also am Stuhlunterteil, angelenkt.In order to adjust the upper part of the chair, a spindle drive 30 is provided in a manner known per se with a spindle nut 31 and a threaded spindle 32. The spindle drive 30 is suspended from the seat frame 7 by means of trunnions 33 and brackets 34. The spindle nut 31 is also articulated by means of a joint 35 and brackets 36 on the support frame 3, that is to say on the lower part of the chair.

Ausgehend von der dargestellten Position wird bei eingeschaltetem Antrieb 30 die Gewindespindel 32 längs der Spindelmutter 31 bewegt; infolge der Koppelung des Antriebs mit dem Sitzrahmen 7 wird der Sitz 4 in Längsrichtung des Stuhles verstellt. Die Führungsbuchsen 24, 25 werden dabei längs der Führungsstangen 21, 22 verstellt. Während der Verstellbewegung läuft die Rolle 19 auf der schiefen Ebene der Laufbahn 20 ab. Durch das Eigengewicht der Rückenlehne wird die Rolle auf die Laufbahn 20 gedrückt. In Verbindung mit der Darstellung nach Fig. 3 ist ersichtlich, dass mit dem Nachvornebewegen des Sitzrahmens 7 und dem Abrollen der Rolle 19 auf der Laufbahn 20 der Rollenhebel 16 um die Gelenkachse 17 kippt, mit der Folge, dass über den Hebelarm 15 die Zug-/Druckstange 13 in Darstellungsebene nach rechts bewegt wird. Durch die Koppelung von Zug-/Druckstange 13 mit dem Fortsatz 11 und der winkelsteifen Verbindung dieses Fortsatzes mit dem an der Rückenlehne 5 befestigten Befestigungsteil 10 wird die Rückenlehne nach hinten geneigt.Starting from the position shown, the threaded spindle 32 is moved along the spindle nut 31 when the drive 30 is switched on; due to the coupling of the drive to the seat frame 7, the seat 4 is adjusted in the longitudinal direction of the chair. The guide bushes 24, 25 are adjusted along the guide rods 21, 22. During the adjustment movement, the roller 19 runs on the inclined plane of the track 20. The roller is pressed onto the track 20 by the weight of the backrest. In connection with the representation according to FIG. 3 it can be seen that as the seat frame 7 moves forward and the roller 19 rolls on the track 20, the roller lever 16 tilts about the articulation axis 17, with the result that the pull arm 15 / Push rod 13 is moved to the right in the display plane. By coupling the pull / push rod 13 with the extension 11 and the angularly rigid connection of this extension with the fastening part 10 fastened to the backrest 5, the backrest is inclined to the rear.

Durch die unter einem Winkel von jeweils ca. 10° zur Horizontalen geneigten Führungsstangen 21, 22 bzw. 21 a, 22a wird die Sitz- und Beinauflage bei einem Nachvorneschieben leicht angehoben. Der Neigungswinkel der Führungsstangen 21, 22 bestimmt dabei den Grad des Anhebens der Sitz- und Beinauflage.Due to the guide rods 21, 22 and 21a, 22a, which are inclined at an angle of approximately 10 ° to the horizontal, the seat and leg support are slightly raised when pushed forward. The angle of inclination of the guide rods 21, 22 determines the degree of lifting of the seat and leg support.

Die Anordnung der Führungsstangen 21, 22 ist vorteilhafterweise paarweise; denkbar ist auch eine Ausführung mit lediglich einer paarweisen Anordnung der Stangen 21, 21 und nur einer Führungsstange im vorderen Bereich.The arrangement of the guide rods 21, 22 is advantageously in pairs; An embodiment with only a paired arrangement of the rods 21, 21 and only one guide rod in the front area is also conceivable.

Diese müsste aber dann mittig angeordnet sein. Wegen der besseren Anordnung des Antriebsteiles 30 und einer besseren Sicherung gegen Verkippen ist jedoch eine doppelte paarweise Anordnung der Führungsstangen vorteilhafter.But this would have to be arranged in the middle. Because of the better arrangement of the drive part 30 and better protection against tilting, however, a double arrangement of the guide rods in pairs is more advantageous.

Claims (7)

1. A dental chair having a lower part which includes a supporting frame (3), and an upper part which includes a seat (4) and a back rest (5) which is pivotably articulated thereto, and having a displacing device (21-25) which is formed as a guide bar and is arranged between the supporting frame (3) and the upper part of the chair, and by means of which a seat frame (7) which supports the upper part of the chair can be moved along the lower part of the chair, means being provided which, on tilting the back rest, displace the seat relative to the lower part of the chair in the longitudinal direction of the chair, on the one hand, and, on the other hand, tilt the seat about a transverse axis with the aid of a roller (19) which is supported on a track (20), characterised in that the swivel bearing (6) for the back rest (5) is stationarily arranged on the seat frame (7) approximately in the region of the hip joint of a person sitting in the chair; that the part (9) of the bearing (6) on which the back rest (5) is arranged, has an extension (11) which is connected to the back rest (5) so as to be angularly rigid and which opens downwardly into the seat frame (7), and to which a pull-push rod (13) is articulated; and that a roller lever (16) having two lever arms (15, 18) is articulated to the seat frame (7), the push-pull rod (13) being articulated to the one lever arm (15) of the roller lever, and at the other arm (18) of which roller lever, there is positioned the roller (19) which is supported on the track (20) which is arranged on the supporting frame (3) of the lower part of the chair and determines the tilting motion of the seat.
2. A chair as claimed in Claim 1, characterised in that the extension (11), the push-pull rod (13) and the roller lever (16) are arranged on both sides of the back rest (5).
3. A chair as claimed in Claim 1 or Claim 2, characterised in that the roller lever (16) forms a preferably isosceles triangle with the two joints (14,17) and the bearing of the roller (19).
4. A chair as claimed in Claim 3, characterised in that the roller lever (16) has V-shaped lever arms (15, 18) which at their intersection are articulated to the seat frame (3) by means of a bearing (17).
5. A chair as claimed in one of Claims 1-4, characterised in that the guide bar consists of two longitudinal guide rods (21, 22) arranged one after the other, which are tilted towards one another at an obtuse angle and which are secured on the seat frame (7), and bushings (24, 25) which are assigned to said longitudinal guide rods and are articulated to the seat frame (3) of the lower part of the chair.
6. A chair as claimed in Claim 5, characterised in that the two guide rods (21, 22) arranged one after the other, are respectively arranged so as to be tilted to the horizontal at an angle of 10°.
7. A chair as claimed in one of Claims 5 or 6, characterised in that the guide rods (21, 22) are arranged in pairs.
EP83102086A 1982-03-17 1983-03-03 Dental chair Expired EP0088956B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3209773 1982-03-17
DE19823209773 DE3209773A1 (en) 1982-03-17 1982-03-17 DENTAL PATIENT CHAIR

Publications (3)

Publication Number Publication Date
EP0088956A2 EP0088956A2 (en) 1983-09-21
EP0088956A3 EP0088956A3 (en) 1984-05-02
EP0088956B1 true EP0088956B1 (en) 1986-06-25

Family

ID=6158532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83102086A Expired EP0088956B1 (en) 1982-03-17 1983-03-03 Dental chair

Country Status (4)

Country Link
US (1) US4505514A (en)
EP (1) EP0088956B1 (en)
JP (1) JPS58169449A (en)
DE (2) DE3209773A1 (en)

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US6106065A (en) 1997-10-24 2000-08-22 Reliance Medical Products, Inc. Examination chair with lifting and tilting mechanism
US6030043A (en) * 1997-12-18 2000-02-29 Bertrand Faure Sitztechnik Gmbh & Co. Kg Motor vehicle seat, in particular back seat
USD418339S (en) * 1998-10-22 2000-01-04 Reliance Medical Products, Inc. Chair back cushion
USD418686S (en) * 1998-10-23 2000-01-11 Reliance Medical Prodcuts, Inc. Combined outer chair frame with armrests and a footrest
USD419343S (en) * 1999-05-12 2000-01-25 Reliance Medical Products, Inc. Outer frame cover for a chair
USD420233S (en) * 1999-05-12 2000-02-08 Reliance Medical Products, Inc. Chair armrest
USD423262S (en) * 1999-05-13 2000-04-25 Reliance Medical Products, Inc. Chair footrest
USD424337S (en) * 1999-08-18 2000-05-09 Reliance Medical Products, Inc. Chair cushion
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US6406294B1 (en) 1999-11-24 2002-06-18 Bell Dental Products, Llc Self contained dental chair with integrated compressor and vacuum pump and methods
BRPI0823267A2 (en) 2007-01-29 2013-09-24 Miller Herman Inc seat structure and methods for using it
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Also Published As

Publication number Publication date
JPS58169449A (en) 1983-10-05
DE3364237D1 (en) 1986-07-31
DE3209773A1 (en) 1983-09-22
US4505514A (en) 1985-03-19
EP0088956A3 (en) 1984-05-02
EP0088956A2 (en) 1983-09-21
JPH0246218B2 (en) 1990-10-15

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