EP0303145B1 - Motorised adjustable headrest for a dental treatment chair - Google Patents
Motorised adjustable headrest for a dental treatment chair Download PDFInfo
- Publication number
- EP0303145B1 EP0303145B1 EP88112484A EP88112484A EP0303145B1 EP 0303145 B1 EP0303145 B1 EP 0303145B1 EP 88112484 A EP88112484 A EP 88112484A EP 88112484 A EP88112484 A EP 88112484A EP 0303145 B1 EP0303145 B1 EP 0303145B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- headrest
- treatment chair
- chair according
- hinge
- backrest
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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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
- A61G15/10—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 treatment chair with an adjustable headrest according to the preamble of claim 1.
- a treatment chair is known from DE-A-3 347 255.
- a support member carrying the headrest is designed as a circularly curved narrow plate with a center of circle which is approximately in the cervical vertebral joint of a Patient sitting in chair.
- the curved plate is guided in a slide that can be adjusted along the backrest and can be moved in and out of the slide or out of the backrest by means of a hydraulic cylinder drive.
- the circular arc guide of the carrier plate and the longitudinal guide of the slide are comparatively complex on the one hand; on the other hand, they require a relatively thick backrest construction in order to be able to accommodate the parts, in particular the curved plate, in the interior of the backrest in the retracted state.
- the headrest has an intermediate piece which is provided with a curved track which, viewed from the side of the headrest, has sections which are curved in opposite directions in the manner of a shaft.
- the cam track is guided in a guide provided on the backrest, the intermediate piece for effecting an adjustment of the headrest being connected with its end facing away from the headrest to a pulling or pushing device arranged on the backrest.
- the guidance of the curved path is formed by a horizontal rod arranged transversely to the longitudinal direction of the backrest, on which the intermediate piece with the curved path rests.
- the horizontal bar is rotatably mounted.
- the end of the intermediate piece facing away from the headrest is pivotable and longitudinally displaceable in a carriage carried by the backrest, which is adjusted by a further pulling or pushing device.
- the invention specified in claim 1 is based on the object to provide an improvement, in particular with the aim of designing the kinematics of the headrest so that an optimal adaptation to the natural pitching movement of the head of a patient in the various treatment positions, especially for treatment of the upper and lower jaw on the seated and lying patient is given, which ultimately means that the headrest should be adjustable in as wide a range as possible following the natural pitching movement of the head.
- the spatial dimensions for such a headrest adjustment device should be as small as possible.
- An important advantage of the solution according to the invention is that, due to the parallelogram-like linkage, when the headrest is tilted, an opposing tilting movement occurs, as a result of which an optimal adaptation to the natural head movement of a patient and a very wide adjustment range for the headrest is achieved.
- Fig. 1 shows a simplified representation of a dental treatment chair, in which in a known manner a base part 1 is held by an adjusting device 2, not shown in detail, a chair top 5 consisting of a seat 3 and a backrest 4 is adjustable in height.
- a headrest 7 is supported on the backrest 4 by means of a carrier part 6 so as to be adjustable in the direction of its longitudinal extension.
- the headrest 7 contains two shell-shaped housing parts, a lower part 8 and an upper part 9 receiving the headrest padding.
- FIG. 2 shows the headrest 7 with the upper part 8 removed obliquely from the front, that is to say in a slightly perspective representation.
- two guide rods 10 extending in the longitudinal direction of the headrest are rigidly fastened, on which ball bushings 11 are guided in an adjustable manner.
- the ball bushings 11 are rigidly connected to one another by means of a traverse 12 arranged transversely to the longitudinal axis of the headrest.
- a clamping piece 13 is fastened, with which the cross member 12 can be coupled with a toothed belt 14 and thus with the ball bushings 11.
- the toothed belt 14 is part of an electric motor drive which contains a motor 15 installed transversely in the lower end of the headrest and a guide roller 16 arranged at the opposite end.
- a driver 17 is rigidly fastened in the center to the crossbar 12 and extends through the headrest housing through a recess 18 which is likewise provided in the center of the headrest and forms an articulated connection 21 there with a linkage arm 20 (FIG. 3).
- the link arm 20 is plate-shaped; the end opposite the joint 21 forms a further joint 22 with the headrest support part 6.
- the two link arms 20, 23 form a linkage similar to the linkage 22, 24 and 21, 30; in contrast to a real parallelogram linkage, in which the joint distances are the same, the joint distance here is different.
- the joint distance b of the upper joint connections 21, 30 is approximately twice as large as the distance a of the lower joint connection 22, 24.
- the resulting "distorted" parallelogram makes it possible for the headrest to be pivoted backwards (see dash-dotted line) 5) executes a counter-pivoting in the area of the headrest. The headrest therefore does not perform a pure parallelogram or swivel movement, but a mixed movement of the two.
- the two ball bushings are moved along the guide rods 10 in the case of a drive via the toothed belt 14 via the crossbar.
- This also adjusts the parallelogram arms 20, 23, the two rollers 27 being supported on the inclined guideway 28 and thus adjusting the headrest in the manner described.
- the slope and shape of the curved path 28 determine the relationship between the pivoting movement and the longitudinal displacement and thereby the desired curve 32, shown in broken lines in FIG. 5.
- This curve corresponds to an arc, the center of which is in the area of the cervical spine of a patient in the chair.
- a head support point P assumed on the headrest accordingly does not perform a pivoting movement about the articulation points 22/24 in accordance with the circular arc 31 shown in dashed lines, but rather a movement in accordance with the curve 32 shown in dashed lines.
- a spindle drive can be provided and the two link arms can also be designed in the otherwise usual rod construction instead of the plate-shaped configuration described.
- a drive in the backrest area e.g. inside the backrest, conceivable and the adjustment, as described, via a cable or a toothed belt.
- the cover 33 advantageously also extends over the switches 35 (see Fig.
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- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (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)
- Chair Legs, Seat Parts, And Backrests (AREA)
Description
Die Erfindung betrifft einen zahnärztlichen Behandlungsstuhl mit einer verstellbaren Kopfstütze nach dem Oberbegriff des Anspruchs 1. Ein derartiger Behandlungsstuhl ist aus der DE-A-3 347 255 bekannt.The invention relates to a dental treatment chair with an adjustable headrest according to the preamble of
In dem Bestreben, die Kopfstütze eines zahnärztlichen Behandlungsstuhles in ihrem Bewegungsablauf der natürlichen Kopfnickbewegung eines Patienten in den verschiedenen Behandlungseinstellungen, vornehmlich in der Behandlung des Ober- und Unterkiefers am sitzenden bzw. liegenden Patienten, anzupassen, sind verschiedene Konstruktionen bekannt geworden.Various designs have become known in an effort to adapt the headrest of a dental treatment chair in its movement sequence to the natural nodding movement of a patient in the various treatment settings, primarily in the treatment of the upper and lower jaw on the seated or lying patient.
Aus der US-A-45 15 406 ist eine Konstruktion bekannt, bei der ein die Kopfstütze tragendes Trägerteil, in der Fachsprache häufig als "Kopfstützenschwert" bezeichnet, als kreisförmig gebogene schmale Platte ausgebildet ist, mit einem Kreismittelpunkt, der etwa im Halswirbelgelenk eines im Stuhl sitzenden Patienten liegt. Die gebogene Platte ist in einem längs der Rückenlehne verstellbaren Schlitten geführt und kann mittels eines Hydraulik-Zylinder-Antriebs aus dem Schlitten bzw. aus der Rückenlehne ein- und ausgefahren werden. Die Kreisbogenführung der Trägerplatte und die Längsführung des Schlittens sind einerseits vergleichsweise aufwendig; sie bedingen andererseits eine relativ dicke Rückenlehnenkonstruktion, um die Teile, insbesondere die bogenförmige Platte, im eingefahrenen Zustand im Innern der Rückenlehne unterbringen zu können. Jeder Versuch, die Rückenlehne in diesem Bereich dünner zu gestalten, was erwünscht ist, um in der Volliegestellung den Patientenkopf möglichst tief positionieren zu können, dennoch aber genügend Kniefreiheit für den Behandler zu haben, würde zu einer Einschränkung der Kinematik und damit zu einer Einschränkung der Positioniermöglichkeiten führen.From US-A-45 15 406 a construction is known in which a support member carrying the headrest, often referred to in technical terms as a "headrest sword", is designed as a circularly curved narrow plate with a center of circle which is approximately in the cervical vertebral joint of a Patient sitting in chair. The curved plate is guided in a slide that can be adjusted along the backrest and can be moved in and out of the slide or out of the backrest by means of a hydraulic cylinder drive. The circular arc guide of the carrier plate and the longitudinal guide of the slide are comparatively complex on the one hand; on the other hand, they require a relatively thick backrest construction in order to be able to accommodate the parts, in particular the curved plate, in the interior of the backrest in the retracted state. Every 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 sufficient Having knee room for the practitioner would lead to a restriction of the kinematics and thus a limitation of the positioning options.
Aus der DE-A-25 41 506 ist eine Konstruktion bekannt, bei der die Kopfstütze ein Zwischenstück aufweist, das mit einer Kurvenbahn versehen ist, welche von der Seite der Kopfstütze gesehen nach Art einer Welle gegenläufig gekrümmte Abschnitte aufweist. Die Kurvenbahn ist in einer an der Rückenlehne vorgesehenen Führung geführt, wobei das Zwischenstück zur Bewirkung einer Verstellung der Kopfstütze mit seinem der Kopfstütze abgewandten Ende mit einer an der Rückenlehne angeordneten Zug- oder Schubvorrichtung verbunden ist. Die Führung der Kurvenbahn ist durch eine quer zur Längsrichtung der Rückenlehne angeordnete horizontale Stange gebildet, auf der das Zwischenstück mit der Kurvenbahn aufliegt. Die horizontale Stange ist dabei drehbar gelagert. Das der Kopfstütze abgewandte Ende des Zwischenstückes ist schwenkbar und längsverschieblich in einem von der Rückenlehne getragenen Schlitten gelagert, der durch eine weitere Zug- oder Schubvorrichtung verstellt wird.From DE-A-25 41 506 a construction is known in which the headrest has an intermediate piece which is provided with a curved track which, viewed from the side of the headrest, has sections which are curved in opposite directions in the manner of a shaft. The cam track is guided in a guide provided on the backrest, the intermediate piece for effecting an adjustment of the headrest being connected with its end facing away from the headrest to a pulling or pushing device arranged on the backrest. The guidance of the curved path is formed by a horizontal rod arranged transversely to the longitudinal direction of the backrest, on which the intermediate piece with the curved path rests. The horizontal bar is rotatably mounted. The end of the intermediate piece facing away from the headrest is pivotable and longitudinally displaceable in a carriage carried by the backrest, which is adjusted by a further pulling or pushing device.
Auch bei dieser bekannten Konstruktion wird die Beinfreiheit des Behandlers bei liegender Behandlungsposition eingeschränkt. Ein weiterer Nachteil ist darin zu sehen, daß die Verstellmöglichkeit weniger günstig ist als bei der zuvor erwähnten Konstruktion.In this known construction, too, the legroom of the practitioner is restricted when the treatment position is lying down. Another disadvantage is the fact that the adjustment is less favorable than in the construction mentioned above.
Der im Patentanspruch 1 angegebenen Erfindung liegt die Aufgabe zugrunde, demgegenüber eine Verbesserung zu schaffen, insbesondere mit dem Ziel, die Kinematik der Kopfstütze so zu gestalten, daß eine optimale Anpassung an die natürliche Nickbewegung des Kopfes eines Patienten in den verschiedenen Behandlungsstellungen, insbesondere zur Behandlung des Ober-und Unterkiefers am sitzenden und liegenden Patienten gegeben ist, was letztlich bedeutet, daß die Kopfstütze in einem möglichst weiten Bereich der natürlichen Nickbewegung des Kopfes folgend verstellbar sein soll. Die räumlichen Abmessungen für eine solche Kopfstützenverstelleinrichtung sollen dabei so klein wie möglich sein.The invention specified in
Ein wesentlicher Vorzug der erfindungsgemäßen Lösung ist, daß, bedingt durch das parallelogrammähnliche Gestänge, beim Neigen der Kopfstütze eine gegenläufige Kippbewegung entsteht, wodurch eine optimale Anpassung an die natürliche Kopfbewegung eines Patienten und ein sehr weiter Verstellbereich für die Kopfstütze erzielt wird. Nachdem sämtliche Teile zur Erzeugung der Kinematik außerhalb des Rückenlehnengehäuses und weitgehend innerhalb des Kopfstützengehäuses liegen, kann die Rückenlehne selbst, da sie nur eine einfache Geradführung für das sehr schmal und dünn gehaltene Kopfstützenträgerteil aufweisen muß, sehr dünn ausgeführt sein.An important advantage of the solution according to the invention is that, due to the parallelogram-like linkage, when the headrest is tilted, an opposing tilting movement occurs, as a result of which an optimal adaptation to the natural head movement of a patient and a very wide adjustment range for the headrest is achieved. After all the parts for generating the kinematics are outside the backrest housing and largely inside the headrest housing, the backrest itself, since it only has to have a simple straight guide for the very narrow and thin headrest support part, can be made very thin.
Die Lösung der Aufgabe ist in den kennzeichenden Merkmalen des Anspruchs 1 angegeben.The solution to the problem is specified in the characterizing features of
Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachstehenden Beschreibung eines Ausführungsbeispieles.
Es zeigen:
- Fig. 1 einen zahnärztlichen Behandlungsstuhl in Seitenansicht,
- Fig. 2 die Kopfstütze des Stuhles nach Fig. 1 in Frontansicht mit abgenommenem Oberteil,
- Fig. 3 die Kopfstütze in Rückansicht,
- Fig. 4 einen Schnitt entlang der Linie IV-IV in Fig. 2,
- Fig. 5 die Kopfstütze in Seitenansicht im Schnitt in zwei Verstellpositionen.
Show it:
- 1 is a side view of a dental chair,
- 2 the headrest of the chair of FIG. 1 in a front view with the upper part removed,
- 3 the headrest in rear view,
- 4 shows a section along the line IV-IV in FIG. 2,
- Fig. 5 shows the headrest in side view in section in two adjustment positions.
Die Fig. 1 zeigt in vereinfachter Darstellung einen zahnärztlichen Behandlungsstuhl, bei dem in bekannter Weise an einem Basisteil 1 über eine nicht näher dargestellte Verstelleinrichtung 2 ein aus einem Sitz 3 und einer Rückenlehne 4 bestehendes Stuhloberteil 5 höhenverstellbar gehaltert ist. An der Rückenlehne 4 ist mittels eines Trägerteils 6 eine Kopfstütze 7 in Richtung ihrer Längsausdehnung verstellbar gehaltert. Die Kopfstütze 7 enthält zwei schalenförmige Gehäuseteile, ein Unterteil 8 und ein die Kopfstützenpolsterung aufnehmendes Oberteil 9.Fig. 1 shows a simplified representation of a dental treatment chair, in which in a known manner a
Die Fig. 2 zeigt die Kopfstütze 7 mit abgenommenem Oberteil 8 schräg von vorne, also in einer leicht perspektivischen Darstellung.2 shows the headrest 7 with the
Im Gehäuseunterteil 8 sind zwei in Längsrichtung der Kopfstütze sich erstreckende Führungsstangen 10 starr befestigt, auf denen Kugelbuchsen 11 verstellbar geführt sind. Die Kugelbuchsen 11 sind mittels einer quer zur Längsachse der Kopfstütze angeordneten Traverse 12 starr miteinander verbunden. An der Traverse 12 ist ein Klemmstück 13 befestigt, mit dem sich die Traverse 12 mit einem Zahnriemen 14 und damit mit den Kugelbuchsen 11 kuppeln läßt. Der Zahnriemen 14 ist Teil eines elektromotorischen Antriebs, der einen im unteren Ende der Kopfstütze querliegend eingebauten Motor 15 und eine am gegenüberliegenden Ende angeordnete Führungsrolle 16 enthält.In the
An der Quertraverse 12 ist mittig ein Mitnehmer 17 starr befestigt, der durch eine ebenfalls mittig der Kopfstütze vorgesehene Ausnehmung 18 durch das Kopfstützengehäuse hindurchgreift und dort mit einem Gestängearm 20 eine Gelenkverbindung 21 bildet (Fig. 3). Der Gestängearm 20 ist plattenförmig ausgebildet; das der Gelenkverbindung 21 gegenüberliegende Ende bildet mit dem Kopfstützenträgerteil 6 eine weitere Gelenkverbindung 22.A
Mit 23 ist ein etwa der Breite der Kopfstütze entsprechender weiterer plattenförmiger Gestängearm bezeichnet, der am Trägerteil 6 eine Gelenkverbindung 24 bildet und am gegenüberliegenden Ende beidseitig einen schmalen Fortsatz 25 aufweist, der, wie aus Fig. 4 ersichtlich, hakenförmig ausgebildet ist. Die beiden Fortsätze 25 greifen durch im Kopfstützenunterteil 8 entsprechend vorgesehene Schlitze 26 und tragen an ihren Enden Rollen 27, die sich an fest am Kopfstützenunterteil 8 befestigten schrägen Führungsbahnen 28 abstützen. Die Fortsätze 25, und damit der Gestängearm 23, bilden im Bereich der Knickstelle mit den Kugelbuchsen 11 eine weitere Gelenkverbindung 30.23 with an approximately the width of the headrest corresponding further plate-shaped link arm is designated forms a
Wie aus Fig. 4 hervorgeht, bilden die beiden Gestängearme 20, 23 mit den Gelenkverbindungen 22, 24 und 21, 30 ein parallelogrammähnliches Gestänge; im Gegensatz zu einem echten Parallelogrammgestänge, bei dem die Gelenkabstände gleich sind, ist hier der Gelenkabstand unterschiedlich groß. So ist der Gelenkabstand b der oberen Gelenkverbindungen 21, 30 etwa doppelt so groß wie der Abstand a der unteren Gelenkverbindung 22, 24. Das dadurch entstehende "verzerrte" Parallelogramm macht es möglich, daß die Kopfstütze bei einem Schwenkvorgang nach hinten (sh. strichpunktierte Darstellung in Fig. 5) eine Gegenschwenkung im Bereich der Kopfauflage ausführt. Die Kopfstützte führt also keine reine Parallelogramm- und auch keine reine Schwenkbewegung aus, sondern eine Mischbewegung von beiden.As can be seen from FIG. 4, the two
Aus der aufgezeigten Konstruktion geht hervor, daß bei einem Antrieb über den Zahnriemen 14 über die Quertraverse die beiden Kugelbuchsen längs der Führungsstangen 10 bewegt werden. Dadurch werden auch die Parallelogrammarme 20, 23 verstellt, wobei sich die beiden Rollen 27 an der schrägen Führungsbahn 28 abstützen und so die Kopfstütze in der beschriebenen Weise verstellen. Durch die Steigung und Form der Kurvenbahn 28 wird das Verhältnis von Schwenkbewegung und Längsverschiebung und dadurch die gewünschte, in Fig. 5 gestrichelt eingezeichnete Kurve 32 bestimmt. Diese Kurve entspricht einem Kreisbogen, dessen Mittelpunkt im Bereich der Halswirbelsäule eines im Stuhl befindlichen Patienten liegt. Ein an der Kopfstütze angenommener Kopfauflagepunkt P führt demnach keine Schwenkbewegung um die Gelenkpunkte 22/24 entsprechend dem gestrichelt eingezeichneten Kreisbogen 31 aus, sondern eine Bewegung entsprechend der gestrichelt eingezeichneten Kurve 32.From the construction shown it can be seen that the two ball bushings are moved along the
Wenngleich die aufgezeigte Konstruktion besonders vorteilhaft ist, so sind doch bezüglich des Antriebs und der Gestängeausbildung verschiedene Varianten möglich. So kann anstelle des Zahnriemens ein Spindelantrieb vorgesehen werden und die beiden Gestängearme können anstelle der beschriebenen plattenförmigen Ausbildung auch in der sonst üblichen Stangenkonstruktion ausgeführt sein. Ebenso ist ein Antrieb im Bereich der Rückenlehne, z.B. im Inneren der Rückenlehne, denkbar und die Verstellung, wie beschrieben, über einen Seilzug oder einen Zahnriemen zu bewerkstelligen. Besonders vorteilhaft, insbesondere aus hygienischen und auch aus optischen Gründen, ist es, die gesamte Rückseite, also das Unterteil der Kopfstütze, mit einem elastischen Überzug 33 zu versehen, der im Bereich der Gestänge einen faltenbalgförmigen Ansatz 34 aufweist. Der Überzug 33 erstreckt sich vorteilhafterweise auch über die an der Oberseite der Kopfstütze angeordneten Schalter 35 (sh. Fig. 3), d.h. die Betätigungselemente der Schalter 35 werden vom Überzug überdeckt. Besonders vorteilhaft ist es, wenn die Betätigungselemente formgestalterisch im Überzug bereits berücksichtigt, also in diesem bereits eingearbeitet sind.Although the construction shown is particularly advantageous, different variants are possible with regard to the drive and the linkage design. Thus, instead of the toothed belt, a spindle drive can be provided and the two link arms can also be designed in the otherwise usual rod construction instead of the plate-shaped configuration described. There is also a drive in the backrest area, e.g. inside the backrest, conceivable and the adjustment, as described, via a cable or a toothed belt. It is particularly advantageous, in particular for hygienic and also for optical reasons, to provide the entire rear side, that is to say the lower part of the headrest, with an
Claims (12)
- Dental treatment chair having an adjustable headrest which comprises a support (20, 23) similar to a parallelogram and hinged to the backrest (4) or to a carrier part (6) held on the backrest, the hinge pairs (22, 24; 21, 30) of the support forming a hinge quadrilateral with hinge distances (a, b) of differing sizes, the one with the smaller hinge distance (a) being arranged near the backrest and the one with the greater hinge distance (b) being arranged removed from the backrest, characterized in that the hinge pair (21, 30) removed from the backrest is formed by a jointed connection of the two support arms (20, 23) with a moving part (11) of a straight guide (10, 11), which is provided in the longitudinal direction of the headrest, in that the one hinge arm (23) is provided with a roller lever (25, 27) which is supported on a guideway (28) rigidly fastened in the housing (8) of the headrest (7), and in that a drive (14 to 16), preferably a motor, is provided which adjusts the moving part (11) relative to the fixed part (10) of the straight guide (10, 11).
- Treatment chair according to claim 1, characterized in that at least the one support arm (23) is constructed in the shape of a plate and has an angular extension (25) which engages through corresponding recesses (26) with the housing (8), and in that on the free end of the extension (25) a roller (27) is arranged which is supported on a guideway (28) forming an inclined plane.
- Treatment chair according to claim 2, characterized in that the support arm (23) extends over almost the entire width of the headrest (7) and on its one end on both sides an extension (25) with roller (27) is provided and in the headrest housing (8) corresponding guideways (28) on both sides are provided.
- Treatment chair according to claim 1, characterized in that the other support arm (20) is also constructed in the shape of a plate and is hinged by means of a hinge connection (21) to a carrier (17), which engages through a recess (18), provided on half the headrest width, through the headrest housing (8) and is rigidly connected to the moving part (11) of the straight guide (10, 11).
- Treatment chair according to claim 4, characterized in that the straight guide (10, 11) is formed by two guide rods (10), arranged in parallel with one another in the inside of the housing, and guide bushings (11) surrounding these.
- Treatment chair according to claim 5, characterized in that the two guide bushings (11) are connected rigidly to one another by a traverse (12) extending at right angles to the longitudinal axis of the headrest, to which traverse the carrier (17) is fastened.
- Treatment chair according to claim 1, characterized in that there is provided as drive an electric motor (15) with a transmission element, preferably a toothed belt (14), arranged along the headrest and between the two guide rods (10), and in that the transmission element (14) is coupled with a clamping piece (13), to which a traverse (12) is fastened, on which on both sides guide bushings (11) are arranged.
- Treatment chair according to claim 1, characterized in that the hinge arms (20, 23) are hinged to a carrier part (6) held on the backrest (4) of the chair in such a way that it can be adjusted in the longitudinal direction of the chair.
- Treatment chair according to claim 1, characterized in that the housing of the headrest (7) is formed by two half shells (8, 9), one of which (8) carries the adjusting elements and the other one the pad of the headrest.
- Treatment chair according to claim 1, characterized in that at least the support arms (20, 22), preferably the entire rear part (8) of the headrest, are provided with an elastic covering (33).
- Treatment chair according to claim 10, characterized in that the covering (33) in the region of the support arms (20, 22) is provided with an attachment (34) in the shape of bellows.
- Treatment chair according to claim 10, characterized in that the covering (33) covers switches (35) arranged in this region of the headrest, preferably containing their actuation elements.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3727204 | 1987-08-14 | ||
| DE3727204 | 1987-08-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0303145A1 EP0303145A1 (en) | 1989-02-15 |
| EP0303145B1 true EP0303145B1 (en) | 1991-08-14 |
Family
ID=6333814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88112484A Expired - Lifetime EP0303145B1 (en) | 1987-08-14 | 1988-08-01 | Motorised adjustable headrest for a dental treatment chair |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4840429A (en) |
| EP (1) | EP0303145B1 (en) |
| JP (1) | JPH0515301Y2 (en) |
| DE (2) | DE8717434U1 (en) |
Families Citing this family (52)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0517933B1 (en) * | 1991-06-10 | 1995-03-22 | Siemens Aktiengesellschaft | Dentist's chair with adjustable headrest |
| DE4410277C2 (en) * | 1994-03-24 | 1997-09-11 | Kaltenbach & Voigt | Medical or dental chair |
| US5860177A (en) * | 1997-04-22 | 1999-01-19 | Jung; Brian H. | Adjustable travel pillow |
| EP0925994A1 (en) * | 1997-12-24 | 1999-06-30 | Gestind M.B. Manifattura Di Bruzolo S.P.A | A headrest for motor verhicle seats |
| EP0976608A1 (en) * | 1998-07-09 | 2000-02-02 | Gestind M.B. Manifattura Di Bruzolo S.P.A | A headrest for motor-vehicle seats |
| IT1306990B1 (en) * | 1999-01-15 | 2001-10-11 | Bruzolo Manifatt Gestind Mb | HEADREST FOR A VEHICLE SEAT, IN PARTICULAR A VEHICLE. |
| DE19944719C1 (en) * | 1999-09-17 | 2001-01-11 | Lear Corp Gmbh & Co Kg | Automobile passenger seat for 2-door vehicle has integrated headrest moved relative to backrest frame as seat is pivoted forwards for reducing overall length of backrest |
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| DE3347255C2 (en) * | 1983-12-28 | 1986-08-14 | E M D A Fabrik elektro-medizinischer und dentaler Apparate Georg Hartmann GmbH & Co KG, 6000 Frankfurt | Dental patient chair with headrest |
| JPS6196921U (en) * | 1984-11-30 | 1986-06-21 | ||
| JPS61102153U (en) * | 1984-12-12 | 1986-06-30 | ||
| DE3543980A1 (en) * | 1985-12-12 | 1987-06-19 | Siemens Ag | Head support arrangement for a chair, especially a dental treatment chair |
| DE3611282A1 (en) * | 1986-04-04 | 1987-10-08 | Kaltenbach & Voigt | Dental treatment chair |
| US4720146A (en) * | 1986-08-28 | 1988-01-19 | General Motors Corporation | Vehicle seat headrest apparatus and method |
-
1987
- 1987-08-14 DE DE8717434U patent/DE8717434U1/en not_active Expired
-
1988
- 1988-07-21 US US07/222,516 patent/US4840429A/en not_active Expired - Fee Related
- 1988-08-01 EP EP88112484A patent/EP0303145B1/en not_active Expired - Lifetime
- 1988-08-01 DE DE8888112484T patent/DE3864215D1/en not_active Expired - Lifetime
- 1988-08-12 JP JP1988107373U patent/JPH0515301Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0515301Y2 (en) | 1993-04-22 |
| EP0303145A1 (en) | 1989-02-15 |
| JPS6431732U (en) | 1989-02-27 |
| DE3864215D1 (en) | 1991-09-19 |
| US4840429A (en) | 1989-06-20 |
| DE8717434U1 (en) | 1988-10-27 |
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