EP0010706B1 - Dispositif d'arrêt pour un appui-tête à réglage continu d'un dossier de siège ou de chaise - Google Patents

Dispositif d'arrêt pour un appui-tête à réglage continu d'un dossier de siège ou de chaise Download PDF

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Publication number
EP0010706B1
EP0010706B1 EP19790104066 EP79104066A EP0010706B1 EP 0010706 B1 EP0010706 B1 EP 0010706B1 EP 19790104066 EP19790104066 EP 19790104066 EP 79104066 A EP79104066 A EP 79104066A EP 0010706 B1 EP0010706 B1 EP 0010706B1
Authority
EP
European Patent Office
Prior art keywords
clamping device
tongues
support post
clamping
rest
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19790104066
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German (de)
English (en)
Other versions
EP0010706A1 (fr
Inventor
Klaus Jöckel
Reinhold Röhrig
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 EP0010706A1 publication Critical patent/EP0010706A1/fr
Application granted granted Critical
Publication of EP0010706B1 publication Critical patent/EP0010706B1/fr
Expired 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 clamping device for a continuously adjustable backrest part in the backrest of a seat or chair, in particular for the headrest of a dental patient chair, with a displaceably guided in a frame of the backrest for the backrest part and with at least one by frictional force with the Supporting rod engaged and this in each adjustment position holding clamping member which contains a plurality of resilient elements which bear with a biasing force on a surface of the support rod and along. which slides the support rod when moving, the biasing force of the elements is selected so that the support rod is on the one hand fixed in any set position of the backrest against displacement and on the other hand can be moved using an external force acting in the direction of displacement.
  • the guide for the support rod has sloping plates at both ends, which together form a surface of the support rod in V-shaped sections into which cylindrical clamping bodies are inserted.
  • the clamping force is determined on the one hand by the slope of the plates and on the other hand by the force of tension springs that hold the clamping body in the v-shaped sections.
  • a disadvantage of such a construction is that the clamping bodies can undesirably "wedge" in the inclined sections, that is to say there is no uniform clamping force, that the device contains a relatively large number of individual parts and that it also requires a relatively large installation depth.
  • the support rod has a plurality of sawtooth-shaped notches into which a latching element arranged on the backrest frame engages.
  • a disadvantage of this design is that the support rod can only be locked at fixed intervals, so no infinitely variable adjustment is possible, and that for unlatching it is necessary to tilt the support rod transversely to the direction of displacement against a spring force.
  • the headrest can therefore only be adjusted when there is complete relief and there is sufficient free space between the headrest and the head of a person in the chair, which allows the headrest to be raised briefly to the front.
  • the headrest can only be adjusted when there is complete relief and when there is sufficient space between the headrest and the head.
  • Another disadvantage is the fact that the friction elements no longer have to apply the required frictional force due to their wear and have to be readjusted.
  • the arrangement of the spring element and the friction elements also requires a relatively large amount of space, in particular in the installation depth, since each acts on the wide side surfaces of the support rod, which increases the overall height (thickness) of the backrest.
  • the object of the present invention is to provide a simpler, more space-saving and more compact solution which, in particular, does not require any adjustment of the parts, enables largely free of play guidance of the support rod without adhering to narrow tolerances and which is also easier to handle.
  • a clamping device of the type mentioned according to the invention in that resilient tongues in the form of sawtooth-like projections are arranged on an elongated base body which is fixedly arranged in the frame.
  • FIG. 1 shows a diagrammatic representation of a dental patient chair with a backrest 1, on which a headrest 3 is held so that it can be pulled out by means of a support rod 2.
  • the support rod 2 is, as can be seen from FIG. 2, longitudinally displaced in a frame labeled 4 in the direction of arrow 5 led bar.
  • the frame 4 is formed by two laterally arranged clamping strips 6, 6a and two thin plates 7, 7a connecting them, the clamping strips 6, 6a and the plates 7, 7a being connected to one another by a plurality of rivets 8.
  • the compact frame 4 thus formed is detachably fastened by means of four screws 9 to a supporting part 10 of the backrest 1.
  • the support rod 2 has the cross-hatched cross-section in the figure, which is essentially rectangular and has strongly rounded edges.
  • the support rod 2 is guided on the two narrow sides in a plurality of resilient tongues 11 arranged on the two terminal strips 6 and 6a.
  • Fig. 3 shows the terminal block 6 in an enlarged view. It is essentially formed from an elongated narrow base body 12 with holes 13 at the two ends for fastening the complete frame 4 by means of the screws 9 on the backrest support part 10 and holes 14 for fastening the two plates 7, 7a to the terminal strips 6, 6a. With 15 recesses are designated, which are arranged evenly distributed over the length of the clamping part 6 and which serve to avoid a build-up of material and thus to ensure the dimensional accuracy of the parts, especially if they are manufactured by injection molding.
  • the tongues are arranged at a distance (a) from one another which corresponds approximately to their wall thickness (thickness). A plurality of tongues can thus be arranged over a relatively short length, and a sufficiently good guidance can thereby be achieved.
  • Each tongue 11 is assigned a stop part 18 in the form of an adjusting screw, which are arranged in the base body of the clamping part 6, namely transversely to the longitudinal axis 16, in the upper third of the tongue length below the narrowest point 19, which practically forms the pivot point which the tongues feather.
  • the constriction is formed by a milling 20 running approximately parallel to the longitudinal axis 16.
  • the set screws 18 lie on a surface 21 of the tongues 11, the screw-in depth determining the prestressing force and the spring action of the tongues 11 and thus the stiffness of the guidance of the support rod in the clamping device. It can also be used to compensate for manufacturing tolerances in the support rod and in the frame.
  • the clamping strips 6, 6a can also contain flat pressure surfaces running parallel to the narrow sides of the support rod 2. It is then expedient to round off the edges of the likewise substantially rectangular support bar only slightly.
  • All materials that have good sliding, abrasion and spring properties can be considered as materials for the terminal strips.
  • a homopolymer or polyacetal material has proven to be particularly advantageous, with which a particularly good spring value, good sliding properties and high abrasion resistance are achieved.

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)

Claims (11)

1. Dispositif de blocage d'une partie de dossier (3) pouvant être réglée d'une manière continue dans le dossier (1) d'un siège ou d'une chaise, notamment de l'appuie-tête d'une chaise de dentiste pour patients, comprenant une barre-support (2), qui supporte la partie de dossier (3) et qui est guidée, avec possibilité de coulisser, dans un cadre (4) du dossier (1), et au moins une partie de blocage (6, 6a) qui s'applique avec une force de frottement à la barre-support, qui maintient celle-ci dans chaque position de réglage et qui comporte un grand nombre d'éléments élastiques (11), qui s'appliquent avec une force de mise sous tension préalable sur une surface de la barre-support (2) et le long desquels la barre-support (2) glisse lors du coulissement, la force de mise sous tension préalable des éléments (11) étant choisie de manière d'une part à ce que la barre-support (2) soit empêchée par auto-maintien de coulisser en toute position réglée de la partie de dossier (3) et d'autre part à ce qu'elle puisse être déplacée en utilisant une force extérieure s'appliquant dans le sens de coulissement (flèche 5), caractérisé en ce que sur un corps de base (12), s'étendant longitudinalement sur le cadre (4) en y étant fixé rigidement, sont disposées des languettes (11), ayant une élasticité de ressort, sous forme de prolongements de type à dents de scie.
2. Dispositif de blocage suivant la revendication 1, caractérisé en ce que les languettes (11) font un angle aigu (a), de préférence de 20°, par rapport à l'axe longitudinal (16) et sont dirigées dans le sens opposé au sens d'enlèvement de la barre-support (2).
3. Dispositif de blocage suivant l'une des revendications 1 ou 2, caractérisé en ce que les languettes (11) sont disposées parallèlement entre elles à un intervalle (a) correspondant environ à l'épaisseur de paroi des languettes.
4. Dispositif de blocage suivant l'une des revendications 1 à 3, caractérisé en ce que, dans la partie de blocage (6, 6a) sont disposés des éléments de butée (18) dirigés suivant la direction de la course élastique des languettes (11) et venant en butée sur celles-ci, et limitant ainsi l'effet de ressort.
5. Dispositif de blocage suivant la.revendication 4, caractérisé en ce qu'à chaque languette (11) est associé un élément de butée (18), qui est en contact avec la languette dans la région de l'extrémité opposée à l'extrémité libre de la languette.
6. Dispositif de blocage suivant la revendication 4 ou 5, caractérisé en ce que les éléments de butée (18) sont disposés de manière réglable.
7. Dispositif de blocage suivant l'une des revendications 1 à 6, caractérisé en ce que les languettes (11) présentent des surfaces de pression plane, s'étendant parallèlement aux surfaces de frottement de la barre-support (2).
8. Dispositif de blocage suivant l'une des revendications 1 à 6, caractérisé en ce que la barre-support (2) présente un profil rectangulaire à arête très arrondie et les languettes (11) présentent une surface (17) adaptée à ce profil.
9. Dispositif de blocage suivant l'une des revendications 1 à 8, caractérisé en ce que la partie de blocage (6, 6a) est constituée d'une pièce en matière plastique produite par injection, et comporte des encoches (15) obtenues par enlèvement de matériau et disposées transversalement à son axe longitudinal (16).
10. Dispositif de blocage suivant l'une des revendications 1 à 9, caractérisé en ce que, des deux côtés des faces étroites de la barre-support (2) ayant une section transversale essentiellement rectangulaire, est disposée une partie de blocage (6, 6a).
11. Dispositif de blocage suivant l'une des revendications 1 à 10, caractérisé en ce qu'au moins les languettes (11) des parties de blocage (6, 6a) sont en une matière à usure faible ayant de bonnes propriétés de glissement, de préférence en un matériau de polyacétal.
EP19790104066 1978-10-25 1979-10-19 Dispositif d'arrêt pour un appui-tête à réglage continu d'un dossier de siège ou de chaise Expired EP0010706B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782846463 DE2846463C2 (de) 1978-10-25 1978-10-25 Klemmvorrichtung für eine in der Rückenlehne eines Sitzes oder Stuhles stufenlos verstellbar gehalterte Kopfstütze
DE2846463 1978-10-25

Publications (2)

Publication Number Publication Date
EP0010706A1 EP0010706A1 (fr) 1980-05-14
EP0010706B1 true EP0010706B1 (fr) 1983-04-13

Family

ID=6053099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790104066 Expired EP0010706B1 (fr) 1978-10-25 1979-10-19 Dispositif d'arrêt pour un appui-tête à réglage continu d'un dossier de siège ou de chaise

Country Status (2)

Country Link
EP (1) EP0010706B1 (fr)
DE (1) DE2846463C2 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1880882U (de) * 1963-05-08 1963-10-17 Hermann Schnittger Sitzmoebel Sitzmoebel.
US3567282A (en) * 1967-10-04 1971-03-02 Toyota Motor Co Ltd Vehicle seat adjustable head rest
US3578384A (en) * 1968-11-25 1971-05-11 Mccord Corp Adjustable headrest for vehicle seats
CH513019A (de) * 1969-01-28 1971-09-30 Schwarz Bernhard Dr Oec Kopf- und Nackenstütze, insbesondere für Auto- und Flugzeugsitze
US3698765A (en) * 1971-02-16 1972-10-17 American Hospital Supply Corp Adjustable headrest for dental chairs
US4111483A (en) * 1977-06-24 1978-09-05 Pennwalt Corporation Dental chair headrest locking device

Also Published As

Publication number Publication date
EP0010706A1 (fr) 1980-05-14
DE2846463A1 (de) 1980-05-08
DE2846463C2 (de) 1986-01-02

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