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EP0303145B1 - Appui-tête à réglage motorisé pour fauteuil de traitement dentaire - Google Patents

Appui-tête à réglage motorisé pour fauteuil de traitement dentaire Download PDF

Info

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
Application number
EP88112484A
Other languages
German (de)
English (en)
Other versions
EP0303145A1 (fr
Inventor
Klaus Stöckl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
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
Publication of EP0303145A1 publication Critical patent/EP0303145A1/fr
Application granted granted Critical
Publication of EP0303145B1 publication Critical patent/EP0303145B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • 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)

Claims (12)

  1. Fauteuil de traitement dentaire comportant un appui-tête réglable, qui contient une tringlerie en forme de parallélogramme articulé (20,23), qui est articulée sur le dossier (4) ou sur un élément de support (6) fixé au dossier, et dont les couples d'articulations (22,24;21,30) forment un quadrilatère articulé, dont les distances entre articulations (a,b) sont différentes, le quadrilatère possédant la distance entre articulations (a) la plus faible étant proche du dossier et le quadrilatère possédant la distance entre articulations (b) la plus grande étant éloigné du dossier, caractérisé par le fait que le couple d'articulations (21,30) éloigné du dossier est formé par une liaison articulée des deux bras de tringlerie (20,23) avec une partie mobile (11) d'un dispositif de guidage rectiligne (10,11), qui est prévu dans la direction longitudinale de l'appui-tête, qu'un bras de tringlerie (23) comporte un levier à galet (25,27), qui prend appui sur une piste de guidage (28) fixée rigidement dans le carter (8) de l'appui-tête (7), et qu'il est prévu un dispositif d'entraînement (14 à 16), de préférence un moteur, qui déplace la partie mobile (11) par rapport à la partie fixe (10) du dispositif de guidage rectiligne (10,11).
  2. Fauteuil de traitement suivant la revendication 1, caractérisé par le fait qu'au moins l'un des bras de tringlerie (23) est réalisé en forme de plaque et possède un prolongement coudé (25), qui s'engage dans des évidements correspondants (26) ménagés dans le carter (8), et qu'à l'extrémité libre du prolongement (25) est disposé un galet (27), qui prend appui sur une piste de guidage (28) constituant un plan oblique.
  3. Fauteuil de traitement suivant la revendication 2, caractérisé par le fait que le bras de tringlerie (23) s'étend approximativement sur toute la largeur de l'appui-tête (7) et qu'il est prévu des deux côtés, au niveau de l'une de ses extrémités, un prolongement (25) comportant un galet (27) et des pistes de guidage correspondantes (28) placées des deux côtes dans le carter (8) de l'appui-tête.
  4. Fauteuil de traitement suivant la revendication 1, caractérisé par le fait que l'autre bras de tringlerie (20) est également réalisé en forme de plaque et est articulé, au moyen d'une liaison articulée (21), sur un dispositif d'entraînement (17) qui traverse un évidement (18) ménagé dans le carter (8) de l'appui-tête et prévu sur la moitié de la largeur de l'appui-tête, et est raccordé rigidement à la partie mobile (11) du dispositif de guidage rectiligne (10,11).
  5. Fauteuil de traitement suivant la revendication 4, caractérisé par le fait que le dispositif de guidage rectiligne (10,11) est formé par deux tiges de guidage (10) disposées parallèlement l'une à l'autre à l'intérieur du carter, et par des douilles de guidage (11) entourant ces tiges.
  6. Fauteuil de traitement suivant la revendication 5, caractérisé par le fait que les deux douilles de guidage (11) sont raccordées rigidement l'une à l'autre par une traverse (12), qui s'étend transversalement par rapport à l'axe longitudinal de l'appui-tête et sur laquelle est fixé le dispositif d'entraînement (17).
  7. Fauteuil de traitement suivant la revendication 1, caractérisé par le fait qu'il est prévu, comme dispositif d'entraînement, un moteur électrique (15) comportant un organe de transmission, de préférence une courroie dentée (14), installé le long de l'appui-tête et entre les deux tiges de guidage (6), et que l'organe de transmission (14) est accouplé à une pièce de serrage (13), à laquelle est fixée une traverse (12), sur laquelle des douilles de guidage (11) sont installées des deux côtés.
  8. Fauteuil de traitement suivant la revendication 1, caractérisé par le fait que les bras articulés (20,23) sont articulés sur une partie de support (6) maintenue sur le dossier (4) du fauteuil de manière à être réglables dans la direction longitudinale du fauteuil.
  9. Fauteuil de traitement suivant la revendication 1, caractérisé par le fait que le carter de l'appui-tête (7) est formé de deux demi-coques (8,9), dont l'une (8) porte les éléments de réglage et dont l'autre porte le coussin de l'appui-tête.
  10. Fauteuil de traitement suivant la revendication 1, caractérisé par le fait qu'au moins les bras de tringlerie (20,22) et de préférence la totalité de la partie arrière (8) de l'appui-tête, comportent un revêtement élastique (33).
  11. Fauteuil de traitement suivant la revendication 10, caractérisé par le fait que le revêtement (33) comporte, dans la zone des bras de tringlerie (20,22), une partie saillante en forme de soufflet (34).
  12. Fauteuil de traitement suivant la revendication 10, caractérisé par le fait que le revêtement (33) masque des interrupteurs (35) placés dans cette zone de l'appui-tête, et de préférence contient leurs éléments d'actionnement.
EP88112484A 1987-08-14 1988-08-01 Appui-tête à réglage motorisé pour fauteuil de traitement dentaire Expired - Lifetime EP0303145B1 (fr)

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 (fr) 1989-02-15
EP0303145B1 true EP0303145B1 (fr) 1991-08-14

Family

ID=6333814

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112484A Expired - Lifetime EP0303145B1 (fr) 1987-08-14 1988-08-01 Appui-tête à réglage motorisé pour fauteuil de traitement dentaire

Country Status (4)

Country Link
US (1) US4840429A (fr)
EP (1) EP0303145B1 (fr)
JP (1) JPH0515301Y2 (fr)
DE (2) DE8717434U1 (fr)

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Also Published As

Publication number Publication date
DE8717434U1 (de) 1988-10-27
JPH0515301Y2 (fr) 1993-04-22
US4840429A (en) 1989-06-20
JPS6431732U (fr) 1989-02-27
DE3864215D1 (de) 1991-09-19
EP0303145A1 (fr) 1989-02-15

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