EP0517933B1 - Dentist's chair with adjustable headrest - Google Patents

Dentist's chair with adjustable headrest Download PDF

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Publication number
EP0517933B1
EP0517933B1 EP91109500A EP91109500A EP0517933B1 EP 0517933 B1 EP0517933 B1 EP 0517933B1 EP 91109500 A EP91109500 A EP 91109500A EP 91109500 A EP91109500 A EP 91109500A EP 0517933 B1 EP0517933 B1 EP 0517933B1
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EP
European Patent Office
Prior art keywords
headrest
backrest
centre piece
support
dental chair
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
Application number
EP91109500A
Other languages
German (de)
French (fr)
Other versions
EP0517933A1 (en
Inventor
Ulrich Dipl.-Ing. Steininger
Tilman Dipl.-Des. Phleps
Klaus Ing.grad. Stöckl
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Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP91109500A priority Critical patent/EP0517933B1/en
Priority to DE59105010T priority patent/DE59105010D1/en
Priority to DK91109500.8T priority patent/DK0517933T3/en
Priority to US07/883,395 priority patent/US5346283A/en
Priority to JP1992046081U priority patent/JP2605315Y2/en
Publication of EP0517933A1 publication Critical patent/EP0517933A1/en
Application granted granted Critical
Publication of EP0517933B1 publication Critical patent/EP0517933B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/38—Support for the head or the back for the head
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/036—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a head-rest
    • 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
    • A61G15/10—Parts, details or accessories
    • A61G15/12—Rests specially adapted therefor, e.g. for the head or feet
    • A61G15/125—Head-rests

Definitions

  • the invention relates to a dental patient chair with adjustable headrest, which is pivotally articulated about a transverse axis on a sword adjustable in the longitudinal direction of the backrest, the transverse axis with the articulated axis of an arranged on the headrest and loaded by means of actuating means with a tensile or compressive force and so the pivotability of the headrest-causing rod forms a lever arm.
  • a dental treatment chair is designed - taking ergonomic knowledge into account - in an effort to adapt the movement of the headrest of a dental treatment chair to the natural pitching movement that the head of a patient in the treatment chair performs when it is brought into different treatment positions.
  • This is particularly difficult to do for the two extreme positions, namely on the one hand for the extreme 'extension position', in which the head and thus the head restraint should be tilted backwards vis-à-vis the patient for an upper jaw treatment with a direct view of the patient and on the other hand for the ' Prosthetic position ', in which the head should be tilted so far forward when the backrest is in an upright position until a horizontal occlusal plane is reached.
  • a sword carrying the headrest is designed as a circularly curved narrow plate which contains a center of circle which lies approximately in the cervical vertebrae of a patient sitting in the chair.
  • the curved plate is guided in a slot that can be adjusted along the backrest and can can be extended and retracted from the slide or from the backrest using a hydraulic drive.
  • the headrest is also only adjustable to a limited extent; in particular, the two extreme positions mentioned at the beginning can only be set insufficiently.
  • the headrest in contrast to the aforementioned construction, in which the headrest itself can be made relatively flat, in this construction, the headrest is built up relatively high because of the tilting mechanism provided there, which in view of the greatest possible leg or knee space, which the practitioner takes if the backrest is strongly inclined, it is annoying.
  • patient size adjustment is only possible to a limited extent; very large patients also find insufficient support in the neck area.
  • a further headrest construction is known in which a parallelogram-like linkage is articulated on the backrest or on a support part held on the backrest, the pairs of joints of which form a quadrangle with different joint distances. While the joint pair with the smaller joint spacing is arranged close to the backrest, the joint pair provided with the larger joint spacing is arranged remote from the backrest.
  • the pair of joints remote from the backrest is formed by an articulated connection of the two articulated arms to the movable part of a straight guide provided in the longitudinal direction of the headrest.
  • One linkage arm is provided with a roller lever, which is supported on a guide track rigidly fixed in the housing of the headrest. The movable part is moved relative to the fixed part of the straight guide by means of a motor drive.
  • the invention specified in claim 1 has for its object to provide a dental patient chair of the type mentioned, which does not have the aforementioned disadvantages, so that the flatest possible headrest can be achieved, which allows optimal support of the patient's head in all treatment positions, whereby the course of movement between the two extreme positions mentioned at the outset is physiologically favorable, ie the natural pitching movement of a patient's head when it is being adjusted should take place accordingly. Furthermore, in particular, larger and relatively small patients should also be given better support not only of the head but also of the back in the upper region of the vertebrae and cervical vertebrae.
  • the headrest itself can be built extremely flat, preferably as a headrest shell. In this way, the practitioner is given considerably more freedom in the knee area than previously, especially in treatment positions with a lying patient.
  • the further proposed subdivision of the headrest wearer into the three sections, base part, main support and sword, as well as their arrangement, has the great advantage that optimal support of the upper back parts in particular is ensured even for very large patients.
  • the main beam which is part of the backrest, the movement of the patient's upper vertebrae is included in the overall head movement, which is very advantageous because the head movement is not derived solely from the cervical vertebrae area.
  • the backrest forms an approximately straight line together with the headrest support in the extreme extension position, which is advantageous for this treatment position.
  • the prosthetic position there is a clear inclination between the backrest and the main support, which corresponds better to the natural, anatomical conditions in a relaxed, seated patient position than the above-mentioned straight line in the extension position.
  • the two tilting movements that of the headrest and that of the main beam, run simultaneously and in the same direction, but at different speeds, which results in a harmonious adjustment of the patient's head.
  • FIG. 1 shows a schematic illustration of a dental patient chair in a side view.
  • the chair contains, in a known manner, a chair upper part comprising a reclining seat 1, backrest 2 and headrest 3, which is arranged in a known manner by means of an adjustment mechanism, not shown, covered by a bellows 4 in a known manner relative to a chair base part 5, for example in the directions indicated by arrows.
  • the adjustment options given are only examples. It is therefore entirely possible to arrange the backrest to be adjustable relative to the seat, by the connecting element 6 being guided accordingly in the reclining seat 1.
  • With 7 is a headrest support described in more detail in the following figures.
  • FIG. 2 shows the backrest and headrest in a front view (top view) with the backrest cushion removed.
  • the headrest 3 and headrest support 7, which advantageously have the same width, are arranged so as to be longitudinally displaceable on the backrest 2, for which purpose the backrest 2 has an upwardly open cutout 8 in the middle, adapted to at least the lower part of the headrest support 7 is.
  • 2 guide rods 9 are arranged in the backrest, on which guide bushings 10 fastened to the headrest support 7 slide.
  • a geared motor 11 held in the backrest 2, which drives a toothed belt 12 attached to the one guide bush 10.
  • a position transmitter 13 is driven with the toothed belt, with which the exact position of the headrest support with respect to the backrest can be detected or specified.
  • the articulation of the headrest support 7 on the headrest 3, which will be described in more detail later, is covered by a bellows 14 which follows the outer contour of the headrest and headrest support and thus creates a harmonious, easy-to-clean transition.
  • the part of the headrest support 7 which adjoins the bellows downward towards the backrest also has a padding which is adapted to the backrest, so that optimal support is also provided in the extended position, which corresponds to a patient position of very large patients a patient's upper vertebrae and cervical vertebrae are present.
  • FIG. 3 shows a diagrammatic representation of the headrest and headrest support adjustment mechanism with the trim parts removed, specifically in a rear view, ie looking at the back of the backrest.
  • the headrest 3 contains an angled frame 3a, which is advantageously a contour-emphasized molded part and contains a bowl-shaped depression for the headrest of the patient.
  • the headrest support 7 can be divided into three sections I, II, and III.
  • the lower section I contains a base part 15, which carries the two guide bushings 10, a central section II, which contains a main support 16, and an upper section III, which contains a sword designated by 17.
  • the sword 17 is plate-shaped, the one upper end being fork-shaped and containing two bearing pins which form a pivot bearing 18 about which the headrest 3 can be pivoted (arrow).
  • a further pivot bearing 19 is arranged approximately halfway across the headrest, on which a rod 20 is suspended, which extends downward in a slot-like recess 21 in the sword 17.
  • the two axes of the pivot bearings 18 and 19 form a lever arm, as a result of which the headrest is pivoted about the axis of the pivot bearing 18 when the rod 20 is subjected to tension or pressure.
  • the end of the rod 20 opposite the pivot bearing 19 is coupled to a transmission lever 22, which is described in more detail with reference to FIG is supported on a surface 25 of the base part 15. With this adjustment or tilting mechanism, as described in more detail later, the main support 16 can be tilted relative to the base part 15 about the two bearing axes 26 into a certain angular range (arrow).
  • the sword 17 is guided on both sides in a slide guide 27 fastened to the main support 16.
  • An electric motor 28 which is arranged in the base part 15 and which drives a toothed belt 29, which by means of suitable fastening elements, is used for the adjustment 30 attached to the sword 17, otherwise is guided over a deflection roller, not specified.
  • FIG. 4 shows details of the coupling of the rod 20 with the transmission lever 22 in a perspective view. From the figure it can be seen that the lower end of the rod 20 is bent forward, that is to the front of the backrest, and there has a link 31 in which a first roller 32, which is supported at one end of the transmission lever 22, is guided. On a part 33 of the sword 17, a second link 34 is provided, in which a second roller 35 is guided. At the other end of the transmission lever 22 there is a pin 36 which is arranged eccentrically to the bearing pin 23 and on which the support member 24 is mounted. Bearing pin 23 and eccentric pin 36 form a distance b, which causes the main support 16 to tilt relative to the base part 15 when the sword 17 is adjusted by a motor along the cutout 8 of the backrest 2 (FIG. 2).
  • the link 34 takes the transmission lever 22 with it via the roller 35, i.e. this is pivoted downward about the bearing axis 23 in the illustration. Due to the coupling via the roller 32 and the link 31, the push rod 20 is also moved downward, as a result of which the headrest 3 is inclined rearward about the bearing axis 18. The bearing distance of the two rollers 32 and 35 determines the adjustment movement of the rod and thus the headrest 3.
  • the main carrier 16 In synchronism with the combined movement of retracting the sword 17 while simultaneously tilting the headrest backwards, the main carrier 16 is also tilted backwards from a previously slightly inclined position by a certain degree of angle by moving over the Lever arm b between support member 24 and pivot pin 23 during a tilting movement of the transmission lever, as described above, the support member 24 is raised slightly, whereby the main carrier is moved backwards in the aforementioned manner due to the normal load on the backrest by the patient.
  • Figures 5 and 6 show the two end positions of the headrest
  • Figure 5 shows the extended
  • Figure 6 shows the retracted position of the sword.
  • ⁇ 2 2 to 6 °

Description

Die Erfindung bezieht sich auf einen zahnärztlichen Patientenstuhl mit verstellbarer Kopfstütze, die an einem in Längsrichtung der Rückenlehne verstellbaren Schwert um eine Querachse schwenkbar angelenkt ist, wobei die Querachse mit der Gelenkachse einer an der Kopfstütze angeordneten und mittels Stellmittel mit einer Zug- bzw. Druckkraft belasteten und so die Schwenkbarkeit der Kopfstütze bewirkenden Stange einen Hebelarm bildet.The invention relates to a dental patient chair with adjustable headrest, which is pivotally articulated about a transverse axis on a sword adjustable in the longitudinal direction of the backrest, the transverse axis with the articulated axis of an arranged on the headrest and loaded by means of actuating means with a tensile or compressive force and so the pivotability of the headrest-causing rod forms a lever arm.

Die Konzipierung eines zahnärztlichen Behandlungsstuhles erfolgt - unter Berücksichtigung ergonomischer Erkenntnisse - in dem Bestreben, den Bewegungsablauf der Kopfstütze eines zahnärztlichen Behandlungsstuhles der natürlichen Nickbewegung anzupassen, die der Kopf eines im Behandlungsstuhl befindlichen Patienten ausführt, wenn er in verschiedene Behandlungsstellungen gebracht wird. Besonders schwierig ist dies durchführbar für die beiden Extremstellungen, nämlich einerseits für die extreme 'Extensionsstellung', in der für eine Oberkieferbehandlung bei direkter Sicht auf den Patienten der Kopf und damit die Kopfstütze gegenüber der Rückenlehne stark nach hinten geneigt sein soll und andererseits für die 'Prothetikstellung', in der der Kopf bei aufrechter Rückenlehnenstellung so weit nach vorne geneigt sein soll, bis etwa eine horizontale Okklusionsebene erreicht wird.A dental treatment chair is designed - taking ergonomic knowledge into account - in an effort to adapt the movement of the headrest of a dental treatment chair to the natural pitching movement that the head of a patient in the treatment chair performs when it is brought into different treatment positions. This is particularly difficult to do for the two extreme positions, namely on the one hand for the extreme 'extension position', in which the head and thus the head restraint should be tilted backwards vis-à-vis the patient for an upper jaw treatment with a direct view of the patient and on the other hand for the ' Prosthetic position ', in which the head should be tilted so far forward when the backrest is in an upright position until a horizontal occlusal plane is reached.

Aus der US-A-45 15 406 ist eine Konstruktion bekannt, bei der ein die Kopfstütze tragendes Schwert als kreisförmig gebogene schmale Platte ausgebildet ist, die einen Kreismittelpunkt enthält, der etwa im Halswirbelgelenk eines im Stuhl sitzenden Patienten liegt. Die gebogene Platte ist in einem längs der Rückenlehne verstellbar gehalterten Schlitz geführt und kann mittels eines Hydraulikantriebes aus dem Schlitten bzw. aus der Rückenlehne ein- und ausgefahren werden.From US-A-45 15 406 a construction is known in which a sword carrying the headrest is designed as a circularly curved narrow plate which contains a center of circle which lies approximately in the cervical vertebrae of a patient sitting in the chair. The curved plate is guided in a slot that can be adjusted along the backrest and can can be extended and retracted from the slide or from the backrest using a hydraulic drive.

Wenngleich sich zwar diese Konstruktion als physiologisch günstig erweist und eine relativ schmale (dünne) Kopfstützenbauform zuläßt, so ist diese Anordnung jedoch mit Nachteilen behaftet. Wegen der Schwertführung ist der Bewegungswinkel der Kopfstütze stark eingeschränkt; außerdem ist im oberen Rückenlehnenteil eine relativ stark aufbauende Mechanik erforderlich. Jeder Versuch, die Rückenlehne in diesem Bereich dünner zu gestalten, was an sich erwünscht ist, um in der Volliegestellung den Patientenkopf möglichst tief positionieren zu können, dennoch aber ausreichend Kniefreiheit für den Behandler zu haben, würde bei dieser Konstruktion zu einer weiteren Einschränkung der Kinematik und damit der Positioniermöglichkeit für den Patientenkopf führen. Ein weiterer Nachteil ist darin zu sehen, daß eine Anpassung an relativ große Patienten nur bedingt möglich ist; sehr große Patienten finden bei dieser Anordnung keine Unterstützung im Nackenbereich.Although this construction proves to be physiologically favorable and permits a relatively narrow (thin) headrest design, this arrangement has disadvantages. The angle of movement of the headrest is severely restricted due to the sword guide; in addition, a relatively strong mechanical structure is required in the upper backrest part. Any attempt to make the backrest thinner in this area, which is desirable in order to be able to position the patient's head as deeply as possible in the full position, but still have sufficient knee room for the practitioner, would further restrict the kinematics in this construction and thus the positioning possibility for the patient's head. Another disadvantage is that adaptation to relatively large patients is only possible to a limited extent; very large patients find no support in the neck area with this arrangement.

Bei einer anderen bekannten Konstruktion (DE-36 11 282) ist die Kopfstütze ebenfalls nur begrenzt verstellbar; insbesondere können die beiden eingangs genannten Extremstellungen nur unzureichend eingestellt werden. Im Gegensatz zu der vorgenannten Konstruktion, bei der die Kopfstütze selbst relativ flach ausgeführt sein kann, baut bei dieser Konstruktion die Kopfstütze wegen der dort vorgesehenen Kippmechanik relativ hoch auf, was im Hinblick auf eine möglichst große Bein- bzw. Kniefreiheit, die sich der Behandler bei stark geneigter Rückenlehne wünscht, störend ist. Auch bei dieser bekannten Konstruktion ist eine Patientengrößenanpassung nur bedingt möglich; sehr große Patienten finden ebenfalls keine ausreichende Unterstützung im Nackenbereich.In another known construction (DE-36 11 282), the headrest is also only adjustable to a limited extent; in particular, the two extreme positions mentioned at the beginning can only be set insufficiently. In contrast to the aforementioned construction, in which the headrest itself can be made relatively flat, in this construction, the headrest is built up relatively high because of the tilting mechanism provided there, which in view of the greatest possible leg or knee space, which the practitioner takes if the backrest is strongly inclined, it is annoying. With this known construction, patient size adjustment is only possible to a limited extent; very large patients also find insufficient support in the neck area.

Aus der DE-37 27 204 ist eine weitere Kopfstützenkonstruktion bekannt, bei der an der Rückenlehne bzw an einem an der Rückenlehne gehalterten Trägerteil ein parallelogrammähnliches Gestänge angelenkt ist, deren Gelenkpaare ein Gelenkviereck mit unterschiedlich großen Gelenkabständen bilden. Während das Gelenkpaar mit dem kleineren Gelenkabstand rückenlehnennah angeordnet ist, ist das mit dem größeren Gelenkabstand versehene Gelenkpaar rückenlehnenfern angeordnet. Das rückenlehnenferne Gelenkpaar ist durch eine gelenkige Verbindung der beiden Gelenkarme mit dem beweglichen Teil einer in Längsrichtung der Kopfstütze vorgesehenen Geradführung gebildet. Der eine Gestängearm ist mit einem Rollenhebel versehen, der sich an einer im Gehäuse der Kopfstütze starr befestigten Führungsbahn abstützt. Der bewegliche Teil wird mittels eines motorischen Antriebes relativ zum festen Teil der Geradführung bewegt. Wenngleich mit dieser Verstellmechanik die beiden eingangs genannten Extremstellungen recht gut erreicht werden, so baut auch hier die in der Kopfstütze vorgesehene Mechanik relativ dickwandig auf.From DE-37 27 204 a further headrest construction is known in which a parallelogram-like linkage is articulated on the backrest or on a support part held on the backrest, the pairs of joints of which form a quadrangle with different joint distances. While the joint pair with the smaller joint spacing is arranged close to the backrest, the joint pair provided with the larger joint spacing is arranged remote from the backrest. The pair of joints remote from the backrest is formed by an articulated connection of the two articulated arms to the movable part of a straight guide provided in the longitudinal direction of the headrest. One linkage arm is provided with a roller lever, which is supported on a guide track rigidly fixed in the housing of the headrest. The movable part is moved relative to the fixed part of the straight guide by means of a motor drive. Although the two extreme positions mentioned at the beginning can be achieved quite well with this adjustment mechanism, the mechanism provided in the headrest is also relatively thick-walled here.

Der im Anspruch 1 angegebenen Erfindung liegt die Aufgabe zugrunde, einen zahnärztlichen Patientenstuhl der eingangs genannten Gattung anzugeben, der die vorgenannten Nachteile nicht aufweist, bei dem also eine möglichst flache Kopfstütze erzielt werden kann, die in allen Behandlungspositionen eine optimale Abstützung des Patientenkopfes erlaubt, wobei der Bewegungsablauf zwischen den beiden eingangs genannten Extremstellungen physiologisch günstig, d.h. der natürlichen Nickbewegung eines Patientenkopfes bei dessen Verstellung entsprechend ablaufen soll. Des weiteren soll insbesondere auch größeren und relativ kleinen Patienten eine bessere Abstützung nicht nur des Kopfes sondern auch des Rückens im oberen Rückenwirbel- und Halswirbelbereich ermöglicht werden.The invention specified in claim 1 has for its object to provide a dental patient chair of the type mentioned, which does not have the aforementioned disadvantages, so that the flatest possible headrest can be achieved, which allows optimal support of the patient's head in all treatment positions, whereby the course of movement between the two extreme positions mentioned at the outset is physiologically favorable, ie the natural pitching movement of a patient's head when it is being adjusted should take place accordingly. Furthermore, in particular, larger and relatively small patients should also be given better support not only of the head but also of the back in the upper region of the vertebrae and cervical vertebrae.

Durch die erfindungsgemäß vorgeschlagene Verlegung der Verstellmechanik für die Kopfstütze in den Kopfstützenträger, insbesondere in den unteren und mittleren Abschnitt des Kopfstützenträgers, kann die Kopfstütze selbst extrem flach gebaut, vorzugsweise als Kopfstützenschale ausgebildet werden. Dem Behandler wird so insbesondere in Behandlungspositionen mit liegendem Patienten wesentlich mehr Freiraum im Kniebereich gewährt als bisher.Due to the proposed laying of the adjustment mechanism for the headrest in the headrest support, in particular in the lower and middle section of the headrest support, the headrest itself can be built extremely flat, preferably as a headrest shell. In this way, the practitioner is given considerably more freedom in the knee area than previously, especially in treatment positions with a lying patient.

Die weiterhin vorgeschlagene Unterteilung des Kopfstützenträgers in die drei Abschnitte, Basisteil, Hauptträger und Schwert, sowie deren Anordnung erbringt den großen Vorteil, daß auch bei sehr großen Patienten eine optimale Abstützung vor allem der oberen Rückenpartien gewährleistet ist. Durch das sanfte Neigen und Aufrichten des Hauptträgers, der quasi Teil der Rückenlehne ist, wird die Bewegung der oberen Rückenwirbel des Patienten mit in die gesamte Kopfbewegung einbezogen, was dadurch sehr vorteilhaft ist, weil sich die Kopfbewegung nicht nur alleine aus dem Halswirbelbereich ableitet.The further proposed subdivision of the headrest wearer into the three sections, base part, main support and sword, as well as their arrangement, has the great advantage that optimal support of the upper back parts in particular is ensured even for very large patients. By gently tilting and straightening the main beam, which is part of the backrest, the movement of the patient's upper vertebrae is included in the overall head movement, which is very advantageous because the head movement is not derived solely from the cervical vertebrae area.

Mit den erfindungsgemäßen Maßnahmen wird der weitere Vorteil erzielt, daß die Rückenlehne in der extremen Extensionsstellung zusammen mit dem Kopfstützenträger etwa eine Gerade bildet, was für diese Behandlungsposition von Vorteil ist. In den übrigen Behandlungsstellungen dagegen, insbesondere in der eingangs genannten anderen Extremstellung, der Prothetikstellung, entsteht zwischen der Rückenlehne und dem Hauptträger eine deutliche Neigung, die den natürlichen, anatomischen Gegebenheiten bei einer entspannten sitzenden Patientenhaltung besser entspricht als die obengenannte Gerade in der Extensionsstellung.With the measures according to the invention, the further advantage is achieved that the backrest forms an approximately straight line together with the headrest support in the extreme extension position, which is advantageous for this treatment position. In the other treatment positions, however, especially in the other extreme position mentioned at the beginning, the prosthetic position, there is a clear inclination between the backrest and the main support, which corresponds better to the natural, anatomical conditions in a relaxed, seated patient position than the above-mentioned straight line in the extension position.

Die beiden Kippbewegungen, also die der Kopfstütze und die des Hauptträgers, verlaufen gleichzeitig und gleichsinnig, jedoch mit unterschiedlicher Geschwindigkeit, wodurch eine harmonische Verstellung des Patientenkopfes erzielt wird.The two tilting movements, that of the headrest and that of the main beam, run simultaneously and in the same direction, but at different speeds, which results in a harmonious adjustment of the patient's head.

Durch die Anpassung des Kopfstützenträgers in bezug auf die äußere Kontur der Rückenlehne läßt sich eine kompakte, in sich harmonisch geschlossene äußere Form erzielen, die leicht zu reinigen und zu pflegen ist.By adapting the headrest support with respect to the outer contour of the backrest, a compact, harmoniously closed outer shape can be achieved, which is easy to clean and maintain.

Weitere Vorteile ergeben sich aus der nachstehenden Beschreibung eines Ausführungsbeispieles anhand der Zeichnung.
Es zeigen:

  • Figur 1 einen zahnärztlichen Patientenstuhl in einer Seitenansicht,
  • Figur 2 Rückenlehne und Kopfstütze des Patientenstuhles in einer Draufsicht bei abgenommenem Rückenlehnenpolster,
  • Figur 3 die Kopfstützenverstellmechanik in einer Rückansicht,
  • Figur 4 einen Teil der Kopfstützenverstellmechanik in schaubildlicher Darstellung,
  • Figuren 5 und 6 die komplette Kopfstützenanordnung in Seitenansicht in zwei verschiedenen Positionen.
Further advantages result from the following description of an embodiment with reference to the drawing.
Show it:
  • FIG. 1 shows a dental patient chair in a side view,
  • FIG. 2 backrest and headrest of the patient chair in a top view with the backrest cushion removed,
  • FIG. 3 shows the headrest adjustment mechanism in a rear view,
  • FIG. 4 shows part of the headrest adjustment mechanism in a diagram,
  • Figures 5 and 6, the complete headrest arrangement in side view in two different positions.

Die Figur 1 zeigt in einer schematischen Darstellung einen zahnärztlichen Patientenstuhl in einer Seitenansicht. Der Stuhl enthält in bekannter Weise ein aus Liegesitz 1, Rückenlehne 2 sowie Kopfstütze 3 enthaltendes Stuhloberteil, welches mittels eine nicht näher dargestellte, durch einen Faltenbalg 4 abgedeckte Verstellmechanik in bekannter Weise gegenüber einem Stuhlbasisteil 5 beispielsweise in den durch Pfeile angegebenen Richtungen verstellbar angeordnet ist. Die angegebenen Verstellmöglichkeiten sind nur beispielhaft anzusehen. So ist es durchaus möglich, auch die Rückenlehne relativ zum Sitz verstellbar anzuordnen, indem das Verbindungselement 6 entsprechend im Liegesitz 1 geführt ist. Mit 7 ist ein in den nachfolgenden Figuren noch näher beschriebener Kopfstützenträger bezeichnet.FIG. 1 shows a schematic illustration of a dental patient chair in a side view. The chair contains, in a known manner, a chair upper part comprising a reclining seat 1, backrest 2 and headrest 3, which is arranged in a known manner by means of an adjustment mechanism, not shown, covered by a bellows 4 in a known manner relative to a chair base part 5, for example in the directions indicated by arrows. The adjustment options given are only examples. It is therefore entirely possible to arrange the backrest to be adjustable relative to the seat, by the connecting element 6 being guided accordingly in the reclining seat 1. With 7 is a headrest support described in more detail in the following figures.

Die Figur 2 zeigt Rückenlehne und Kopfstütze in einer Frontansicht (Draufsicht), bei abgenommenem Rückenlehnenpolster. Aus der Darstellung ist ersichtlich, daß Kopfstütze 3 und Kopfstützenträger 7, die vorteilhafterweise gleiche Breite haben, längsverschiebbar an der Rückenlehne 2 angeordnet sind, zu welchem Zweck die Rückenlehne 2 mittig einen nach oben offenen Ausschnitt 8 aufweist, dem angepaßt zumindest der untere Teil des Kopfstützenträgers 7 ist. Beidseitig des Ausschnittes 8 sind in der Rückenlehne 2 Führungsstangen 9 angeordnet, auf denen am Kopfstützenträger 7 befestigte Führungsbuchsen 10 gleiten. Zur Längsverstellung des Kopfstützenträgers 7 dient ein in der Rückenlehne 2 gehalterter Getriebemotor 11, der einen an der einen Führungsbuchse 10 befestigten Zahnriemen 12 antreibt. Mit dem Zahnriemen wird gleichsam ein Stellungsgeber 13 angetrieben, mit dem die genaue Position des Kopfstützenträgers in bezug auf die Rückenlehne erfaßt bzw. vorgegeben werden kann. Die später noch näher beschriebene Anlenkung des Kopfstützenträgers 7 an der Kopfstütze 3 ist durch einen Faltenbalg 14 abgedeckt, der der äußeren Kontur von Kopfstütze und Kopfstützenträger folgt und so einen harmonischen, leicht zu reinigenden Übergang schafft.FIG. 2 shows the backrest and headrest in a front view (top view) with the backrest cushion removed. From the illustration it can be seen that the headrest 3 and headrest support 7, which advantageously have the same width, are arranged so as to be longitudinally displaceable on the backrest 2, for which purpose the backrest 2 has an upwardly open cutout 8 in the middle, adapted to at least the lower part of the headrest support 7 is. On both sides of the cutout 8, 2 guide rods 9 are arranged in the backrest, on which guide bushings 10 fastened to the headrest support 7 slide. For the longitudinal adjustment of the headrest support 7 is a geared motor 11 held in the backrest 2, which drives a toothed belt 12 attached to the one guide bush 10. A position transmitter 13 is driven with the toothed belt, with which the exact position of the headrest support with respect to the backrest can be detected or specified. The articulation of the headrest support 7 on the headrest 3, which will be described in more detail later, is covered by a bellows 14 which follows the outer contour of the headrest and headrest support and thus creates a harmonious, easy-to-clean transition.

In diesem Zusammenhang sei darauf hingewiesen, daß auch der sich an den Faltenbalg nach unten zur Rückenlehne hin anschließende Teil des Kopfstützenträgers 7 eine der Rückenlehne angepaßte Polsterung aufweist, wodurch auch in der ausgefahrenen Position, die einer Patientenlagerung von sehr großen Patienten entspricht, eine optimale Abstützung der oberen Rücken- und Halswirbel eines Patienten gegeben ist.In this context, it should be pointed out that the part of the headrest support 7 which adjoins the bellows downward towards the backrest also has a padding which is adapted to the backrest, so that optimal support is also provided in the extended position, which corresponds to a patient position of very large patients a patient's upper vertebrae and cervical vertebrae are present.

Die Figur 3 zeigt in einer schaubildlichen Darstellung die Kopfstützen- und Kopfstützenträger-Verstellmechanik bei abgenommenen Verkleidungsteilen, und zwar in einer Rückansicht, d.h. mit Blick auf die Rückseite der Rückenlehne. Aus der Darstellung ist erkennbar, daß die Kopfstütze 3 einen abgewinkelten Rahmen 3a enthält, der vorteilhafterweise ein konturenbetontes Formteil ist und eine schalenförmige Vertiefung für die Kopfauflage des Patienten enthält. Der Kopfstützenträger 7 läßt sich in drei Abschnitte I, II, und III unterteilen. Der untere Abschnitt I enthält ein Basisteil 15, welches die beiden Führungsbuchsen 10 trägt, einen mittleren Abschnitt II, der einen Hauptträger 16 enthält, und einen oberen Abschnitt III, der ein mit 17 bezeichnetes Schwert enthält. Das Schwert 17 ist plattenförmig ausgebildet, wobei das eine, obere Ende gabelförmig ausgebildet ist und zwei Lagerzapfen enthält, die ein Schwenklager 18 bilden, um das die Kopfstütze 3 schwenkbar ist (Pfeil). Etwa auf halber Breite der Kopfstütze ist ein weiteres Schwenklager 19 angeordnet, an dem eine Stange 20 eingehängt ist, die sich in einer schlitzartigen Ausnehmung 21 des Schwertes 17 nach unten erstreckt. Die beiden Achsen der Schwenklager 18 und 19 bilden einen Hebelarm, wodurch bei Zug- oder Druckeinwirkung auf die Stange 20 ein Verschwenken der Kopfstütze um die Achse des Schwenklagers 18 erreicht wird. Das dem Schwenklager 19 gegenüberliegende Ende der Stange 20 ist mit einem anhand der Figur 4 noch näher beschriebenen Übersetzungshebel 22 gekoppelt, der mittels eines Lagerzapfens 23 im Hauptträger 16 gelagert ist und an dem unter Bildung eines weiteren Hebelarmes ein Stützglied 24 angeordnet ist, welches welches sich an einer Fläche 25 des Basisteils 15 abstützt. Mit dieser Verstell- bzw. Kippmechanik kann, wie später noch näher beschrieben, der Hauptträger 16 gegenüber dem Basisteil 15 um die beiden Lagerachsen 26 in einen bestimmten Winkelbereich gekippt werden (Pfeil).FIG. 3 shows a diagrammatic representation of the headrest and headrest support adjustment mechanism with the trim parts removed, specifically in a rear view, ie looking at the back of the backrest. From the illustration it can be seen that the headrest 3 contains an angled frame 3a, which is advantageously a contour-emphasized molded part and contains a bowl-shaped depression for the headrest of the patient. The headrest support 7 can be divided into three sections I, II, and III. The lower section I contains a base part 15, which carries the two guide bushings 10, a central section II, which contains a main support 16, and an upper section III, which contains a sword designated by 17. The sword 17 is plate-shaped, the one upper end being fork-shaped and containing two bearing pins which form a pivot bearing 18 about which the headrest 3 can be pivoted (arrow). A further pivot bearing 19 is arranged approximately halfway across the headrest, on which a rod 20 is suspended, which extends downward in a slot-like recess 21 in the sword 17. The two axes of the pivot bearings 18 and 19 form a lever arm, as a result of which the headrest is pivoted about the axis of the pivot bearing 18 when the rod 20 is subjected to tension or pressure. The end of the rod 20 opposite the pivot bearing 19 is coupled to a transmission lever 22, which is described in more detail with reference to FIG is supported on a surface 25 of the base part 15. With this adjustment or tilting mechanism, as described in more detail later, the main support 16 can be tilted relative to the base part 15 about the two bearing axes 26 into a certain angular range (arrow).

Das Schwert 17 ist beidseitig in einer am Hauptträger 16 befestigten Gleitführung 27 geführt. Zur Verstellung dient ein im Basisteil 15 angeordneter Elektromotor 28, der einen Zahnriemen 29 antreibt, welcher mittels geeigneter Befestigungselemente 30 am Schwert 17 befestigt, ansonsten über eine nicht näher bezeichnete Umlenkrolle geführt ist.The sword 17 is guided on both sides in a slide guide 27 fastened to the main support 16. An electric motor 28 which is arranged in the base part 15 and which drives a toothed belt 29, which by means of suitable fastening elements, is used for the adjustment 30 attached to the sword 17, otherwise is guided over a deflection roller, not specified.

Die Figur 4 zeigt Einzelheiten der Koppelung der Stange 20 mit dem Übersetzungshebel 22 in einer perspektivischen Darstellung. Aus der Figur ist ersichtlich, daß das untere Ende der Stange 20 nach vorne, also zur Vorderseite der Rückenlehne hin, abgekröpft ist und dort eine Kulisse 31 aufweist, in der eine erste, am einen Ende des Übersetzungshebels 22 gelagerte Rolle 32 geführt ist. An einem Teil 33 des Schwertes 17 ist eine zweite Kulisse 34 vorgesehen, in der eine zweite Rolle 35 geführt ist. Am anderen Ende des Übersetzungshebels 22 ist ein zum Lagerzapfen 23 exzentrisch angeordneter Zapfen 36 vorgesehen, an dem das Stützglied 24 gelagert ist. Lagerzapfen 23 und Exzenterzapfen 36 bilden einen Abstand b, der die Kippung des Hauptträgers 16 gegenüber dem Basisteil 15 bewirkt, wenn das Schwert 17 motorisch längs des Ausschnittes 8 der Rückenlehne 2 (Fig. 2) verstellt wird.FIG. 4 shows details of the coupling of the rod 20 with the transmission lever 22 in a perspective view. From the figure it can be seen that the lower end of the rod 20 is bent forward, that is to the front of the backrest, and there has a link 31 in which a first roller 32, which is supported at one end of the transmission lever 22, is guided. On a part 33 of the sword 17, a second link 34 is provided, in which a second roller 35 is guided. At the other end of the transmission lever 22 there is a pin 36 which is arranged eccentrically to the bearing pin 23 and on which the support member 24 is mounted. Bearing pin 23 and eccentric pin 36 form a distance b, which causes the main support 16 to tilt relative to the base part 15 when the sword 17 is adjusted by a motor along the cutout 8 of the backrest 2 (FIG. 2).

Angenommen, das Schwert 17 soll in die Rückenlehne eingefahren, also in der Darstellung nach Figur 3 nach unten bewegt werden, so nimmt die Kulisse 34 über die Rolle 35 den Übersetzungshebel 22 mit, d.h. dieser wird um die Lagerachse 23 in der Darstellung nach unten geschwenkt. Durch die Koppelung über die Rolle 32 und die Kulisse 31 wird die Druckstange 20 ebenfalls nach unten bewegt, wodurch die Kopfstütze 3 um die Lagerachse 18 nach hinten geneigt wird. Der Lagerabstand der beiden Rollen 32 und 35 bestimmt dabei die Verstellbewegung der Stange und damit der Kopfstütze 3.Assuming that the sword 17 is to be retracted into the backrest, that is to say moved downwards in the illustration according to FIG. 3, the link 34 takes the transmission lever 22 with it via the roller 35, i.e. this is pivoted downward about the bearing axis 23 in the illustration. Due to the coupling via the roller 32 and the link 31, the push rod 20 is also moved downward, as a result of which the headrest 3 is inclined rearward about the bearing axis 18. The bearing distance of the two rollers 32 and 35 determines the adjustment movement of the rod and thus the headrest 3.

Synchron mit der kombinierten Bewegung aus Einfahren des Schwerts 17 bei gleichzeitigem Nachhintenkippen der Kopfstütze wird der Hauptträger 16, ausgehend von einer zuvor leicht nach vorne geneigten Position, um einen bestimmten Winkelgrad ebenfalls nach hinten geneigt, indem über den Hebelarm b zwischen Stützglied 24 und Lagerzapfen 23 bei einer Kippbewegung des Übersetzungshebels, wie vorbeschrieben, das Stützglied 24 leicht angehoben wird, wodurch aufgrund der normalen Belastung der Rückenlehne durch den Patienten der Hauptträger in der vorgenannten Weise nach hinten bewegt wird.In synchronism with the combined movement of retracting the sword 17 while simultaneously tilting the headrest backwards, the main carrier 16 is also tilted backwards from a previously slightly inclined position by a certain degree of angle by moving over the Lever arm b between support member 24 and pivot pin 23 during a tilting movement of the transmission lever, as described above, the support member 24 is raised slightly, whereby the main carrier is moved backwards in the aforementioned manner due to the normal load on the backrest by the patient.

Für die entgegengesetzte Bewegung, also für das Ausfahren des Schwertes gilt entsprechendes.The same applies to the opposite movement, i.e. for the extension of the sword.

Die Figuren 5 und 6 zeigen die beiden Endstellungen der Kopfstütze, wobei Figur 5 die ausgefahrene und Figur 6 die eingefahrene Stellung des Schwertes zeigt. Aus der Gegenüberstellung ist ersichtlich, daß in der ausgefahrenen Stellung, die beispielsweise für eine Prothetikbehandlung am entspannt sitzenden bzw. leicht geneigt liegenden Patienten gut geeignet ist, der Hauptträger 16 um einen Winkel α₁ zwischen 20 und 25° gegenüber dem Basisteil 15 geneigt ist, während er in der eingefahrenen Stellung, die der eingangs erwähnten Extensionsstellung entspricht, nicht oder nur um wenige Winkelgrade (α₂ = 2 bis 6°) gegenüber dem Basisteil geneigt ist. Aus der Gegenüberstellung ist weiterhin sehr gut die jeweilige Lage der Kopfstütze 3 in den beiden Endstellungen ersichtlich. Deutlich ist erkennbar, daß die Kopfstütze eine sehr viel stärkere Kippbewegung ausführt als der Hauptträger.Figures 5 and 6 show the two end positions of the headrest, Figure 5 shows the extended and Figure 6 shows the retracted position of the sword. From the comparison it can be seen that in the extended position, which is well suited, for example, for prosthetic treatment on a relaxed seated or slightly inclined patient, the main support 16 is inclined at an angle α 1 between 20 and 25 ° relative to the base part 15, while he is in the retracted position, which corresponds to the aforementioned extension position, not or only by a few degrees (α₂ = 2 to 6 °) with respect to the base part. From the comparison, the respective position of the headrest 3 in the two end positions can still be seen very well. It can clearly be seen that the headrest performs a much stronger tilting movement than the main beam.

Claims (9)

  1. Dental chair for patients, having a headrest (3) which is pivotally hinged about a transverse axis (18) on a centre piece (17) adjustable in the longitudinal direction of the backrest (2), for which purpose the transverse axis (18) forms a lever arm with the articulated axis (19) of a bar (20) which is hinged to the headrest (3) and is capable of being loaded with a pulling force or pressure force by means of adjusting means (22) and thus effects the pivot capacity of the headrest, characterized in that the bar (20) and the adjusting means (22) are associated with a headrest support (7) containing the centre piece (17) and adjustable relative to the backrest (2).
  2. Dental chair for patients, in particular according to claim 1, characterized in that the headrest support (7) is composed of three sections (I, II, III), a lower section (I) which contains a base part (15) supported in a longitudinally adjustable manner on the backrest (2), a middle section (II) which contains a main support (16) connected in a hinged manner to the base part (15) and slightly rotatable relative thereto, and an upper section (III) which contains the centre piece (17) arranged in a longitudinally adjustable manner on the main support (16), on the free end of which centre piece the headrest (3) is hinged.
  3. Dental chair for patients according to claim 2, characterized in that at least the lower section (base part 15) is supported along the backrest (2) in an adjustable manner, in a section (8) of the backrest (2) which is open to the top, by means of guide means (9, 10) provided on both sides of the section (8).
  4. Dental chair for patients according to claim 3, characterized in that at least the part of the headrest support (7) arranged in the backrest section (8) is padded to match the outer contours of the backrest (2).
  5. Dental chair for patients according to one of claims 1 to 4, characterized in that the upper section (III) containing the centre piece (17) is bordered by a shock absorber (14) covering the extension length of the centre piece and forming the outer contour of the centre piece.
  6. Dental chair for patients according to one of claims 1 to 5, characterized in that the headrest (3) is constructed as a headrest basin and in this respect contains a bent shaped part (3a) with a basin-shaped depression as head support.
  7. Dental chair for patients according to one of claims 1 to 6, characterized in that the one end of the bar (20) is hinged to a pivot bearing (19) arranged approximately in the centre of the headrest (3) and the bar (20) extends at least over the part of its length adjacent to the headrest in a slotted section (21) of the centre piece (17) and in that the other end of the bar cooperates with a lever mechanism (22 to 24; 31 to 36) in such a way that with an outward movement of the centre piece (17) the headrest (3) and the main support (16) are adjusted in the sense of a raising (forward inclination) and with an inward movement are adjusted in the sense of a lowering (backward inclination).
  8. Dental chair for patients according to claim 7, characterized in that the lever mechanism contains a gear lever (22), the one end of which is guided in a first connecting link (31) of the bar (20) and, as it were, in a second connecting link (34) of the centre piece (17, 33), while the other end is pivotally mounted (23) in the main support (16), and in that at this end of the gear lever with the formation of a further lever arm (6) a supporting element (24) is arranged, which is supported on the base part (15) and as a consequence of the lever action effects a change of the position of inclination between the base part (15) and the main support (16).
  9. Dental chair for patients according to one of claims 1 to 8, characterized in that to adjust the centre piece (17) and to adjust the entire headrest support (7) electromotive drives (11, 28), preferably toothed-belt drives, are provided.
EP91109500A 1991-06-10 1991-06-10 Dentist's chair with adjustable headrest Expired - Lifetime EP0517933B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP91109500A EP0517933B1 (en) 1991-06-10 1991-06-10 Dentist's chair with adjustable headrest
DE59105010T DE59105010D1 (en) 1991-06-10 1991-06-10 Dental patient chair with adjustable headrest.
DK91109500.8T DK0517933T3 (en) 1991-06-10 1991-06-10 Dentist-patient chair with adjustable headrest
US07/883,395 US5346283A (en) 1991-06-10 1992-05-15 Dental patient chair with an adjustable headrest
JP1992046081U JP2605315Y2 (en) 1991-06-10 1992-06-08 Dental patient chair

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91109500A EP0517933B1 (en) 1991-06-10 1991-06-10 Dentist's chair with adjustable headrest

Publications (2)

Publication Number Publication Date
EP0517933A1 EP0517933A1 (en) 1992-12-16
EP0517933B1 true EP0517933B1 (en) 1995-03-22

Family

ID=8206811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91109500A Expired - Lifetime EP0517933B1 (en) 1991-06-10 1991-06-10 Dentist's chair with adjustable headrest

Country Status (5)

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US (1) US5346283A (en)
EP (1) EP0517933B1 (en)
JP (1) JP2605315Y2 (en)
DE (1) DE59105010D1 (en)
DK (1) DK0517933T3 (en)

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Also Published As

Publication number Publication date
JPH0556128U (en) 1993-07-27
JP2605315Y2 (en) 2000-07-10
EP0517933A1 (en) 1992-12-16
US5346283A (en) 1994-09-13
DK0517933T3 (en) 1995-08-21
DE59105010D1 (en) 1995-04-27

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