EP0331122B1 - Gelenkartiger Mechanismus für Kopfstütze - Google Patents

Gelenkartiger Mechanismus für Kopfstütze Download PDF

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Publication number
EP0331122B1
EP0331122B1 EP19890103517 EP89103517A EP0331122B1 EP 0331122 B1 EP0331122 B1 EP 0331122B1 EP 19890103517 EP19890103517 EP 19890103517 EP 89103517 A EP89103517 A EP 89103517A EP 0331122 B1 EP0331122 B1 EP 0331122B1
Authority
EP
European Patent Office
Prior art keywords
bar
headrest
cam
support means
curved
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
EP19890103517
Other languages
English (en)
French (fr)
Other versions
EP0331122A3 (en
EP0331122A2 (de
Inventor
Hugh-James Mccrackin
Dennis Frank Leffler
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
Priority claimed from US07/285,185 external-priority patent/US4848838A/en
Priority claimed from US07/296,915 external-priority patent/US4863218A/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0331122A2 publication Critical patent/EP0331122A2/de
Publication of EP0331122A3 publication Critical patent/EP0331122A3/en
Application granted granted Critical
Publication of EP0331122B1 publication Critical patent/EP0331122B1/de
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

  • This invention relates to an articulated headrest for a treatment support, and more particularly to a mechanism for controlling the tilting angle of the headrest of a dental treatment chair.
  • the preamble of claim is based on US-A-4 151 406.
  • Figure 1(A) indicates one type of prior art headrest mechanism for a dental chair wherein a headrest 1 includes a pad 3 fixedly attached to one end of a support bar 5, the other end of bar 5 being pivotably attached to the backrest 7 of the treatment chair via a coupling 9.
  • the locus of rotation A of headrest 1 has a center of rotation C centered at coupling 9 while the locus of rotation B of the head H of a patient P has a center of rotation C' corresponding with the cervical vertebrae of the patient P when positioned in the treatment chair. Since the center of rotation for headrest 1 does not match the center of rotation for head H, head H will physically slip out of position on pad 3 during adjustment of the tilt of headrest 1. This results in patient discomfort and a necessary repositioning of the posture of patient P.
  • Figures 1(B) indicates another prior art headrest arrangement, such as known for example by US-A- 4,515,406, wherein the headrest mechanism 11 includes a pad 13 fixedly attached to a straight portion 15 of a generally curved support bar 17.
  • the curved portion of support bar 17 rides between rollers 19 located within the backrest 21 of the dental chair and is thereby adjustable along the length of support bar 17 for controlling the tilting of the head H of the patient P.
  • a locking ratchet arrangement 23 is included within backrest 21 and engages support bar 17 for locking it into a desired position. Note that in this arrangement the locus of rotation A of headrest pad 13 has a center of rotation C'' which is also the center of rotation of the head H of the patient P.
  • a disadvantage of this arrangement is that the curvature of support bar 17 prevents a significant lowering of the patient's head into the lap of the dentist since the curvature of support bar 17 is located at the top of the chair backrest.
  • advantageous positioning of the head H of the patient P toward the top of the dentist is limited thereby.
  • US-A- 4,647,108 is substantially similar to the above-noted US-A- 4,515,406 (Fig.1B), except that instead of a curved support bar 17 sliding between rollers 19, a curved support bar slides in a grooved guide sheath mounted inside the top of a backrest.
  • this technique suffers from the same disadvantage of the aforenoted U.S. patent in that the curvature of the support bar prevents a significant lowering the patient's head into the lap of the dentist.
  • the head-rest is mounted for an extensile and retractile movement by a link which extends lengthwise of the back-rest.
  • Pin and slot guiding means are operatively connected between the link and the back-rest such that the head-rest moves along a generally upward path from the stored position to the extended head-supporting position.
  • An object of the present invention is to provide an adjustable headrest for a treatment support which is comfortable for the patient both during and after a readjustment of the tilting of the patient's head and which improves the ability of the headrest to be lowered toward the lap of the dentist.
  • a further object of the invention is to provide a headrest mechanism which can easily be adjusted to a minor range of tilting angle which is separated from a main range of tilting angles.
  • FIGS 2 and 3 illustrate perspective and section views, respectively, of a preferred embodiment of the headrest mechanism in a dental treatment chair.
  • the backrest portion 2 of the treatment chair (not totally shown) is shown in phantom without details of support, cushioning, etc., which details are not necessary for understanding the present invention.
  • a headrest pad 4 is attached to one end of a sliding support bar 6 which extends out the top of backrest 2 and is slidable therein.
  • Support bar 6 has a curved portion wherein headrest pad 4 is attached and a substantially straight portion which extends into backrest 2.
  • a mounting plate 8 secured within backrest 2 includes a support means for slidably positioning the other end of support bar 6 at various ones of plurality of fixed positions.
  • the support means comprises cam plates 10 and 12 secured in a parallel facing relationship on mounting plate 8 and separated by a rotatable pin 14 having its ends captivated by a portion of cam plates 10 and 12 which is located toward head rest 4.
  • Pin 14 has a cross-slot 16 located therethrough, through which the substantially straight portion of support bar 6 is able to slide through.
  • cam plates 10 and 12 include curved cam surfaces 18 therein, which slidably receive the ends of a cam following pin 20.
  • Cam following pin 20 is secured near the end of support bar 6 which is opposite its headrest end.
  • a spring 22 associated with pin 20 urges a pawl 24 against a bar 26 having serrations therein which engage pawl 24 to form a ratchet locking mechanism 28 which locks the position of support bar 6 into any one of a plurality of positions defined by the serrations on bar 26.
  • a release cable (not shown) having an end attached to pawl 24 is accessable from the headrest end of backrest 2 for selectively releasing lock mechanism 28 from its present position and thereby allow repositioning of support bar 6.
  • support bar 6 slides through slot 16 in pin 14 as the position of headrest 4 is adjusted. Due to the confinement of the movement of the lower end of support bar 6 to a curved path defined by the action of cam following pin 20 along cam surfaces 18, headrest 4 moves in a curved path having a center of rotation R (shown in Fig.3) which is from the plane of mounting plate 8 and advantageously coincides with the center of rotation of the cervical vertebrae of a patient when disposed in the treatment chair.
  • R shown in Fig.3
  • adjustment of the tilting angle of headrest 4 coincides with the normal angular movement of the patients's head and such adjustment is thereby accomplished without a sliding of the patient's head with respect to headrest 4.
  • the curved surface which defines the tilting angle is located below the top of the chair back, thereby allowing the mechanical structure nearest the headrest to have a shape which will allow a maximum lowering of the patient's head towards the knees' of the dentist, thereby facilitating certain dental procedures.
  • a first portion 30 comprises a uniformly shaped curved surface which controls a major portion of the movement of bar 6 and hence the tilting angle of headrest 4.
  • a second portion 32 located at at least one end of first portion 30, comprises a surface having a curvature which is substantially different from the curvature of first portion 30, for allowing a range of tilting angles of headrest 4 which facilitates special dental procedures, such a those required during certain x-ray procedures.
  • Figure 4 illustrates a second embodiment of the invention wherein a sigmoidally shaped headrest support bar allows the degree of concavity of the cam following surface and the height of pin 14' to be reduced from that shown in the first embodiment, thereby even further reducing the thickness required for the headrest mechanism.
  • the components and operation of the Figure 4 embodiment are the same as described above with respect to Figures 2 and 3 (and accordingly use the same reference numerals, however, with a prime added) except that in Figure 4, the concavely curved cam surface 18′ have a lesser degree of concavity than the concavely curved cam surfaces 18 of Figures 2 and 3 and the height of pin 14′ is reduced.
  • This lesser degree of concavity and reduced height of pin 14′ advantageously allows the height of support means 10′ and 12′ to be less than the height of support means 10 and 12 of the first embodiment; and therefore allows the backrest to be thinner and the patient's head to be positionable closer to the lap of the dentist.
  • a raised and lowered position of the headrest is shown in Figure 4 in solid lines and phantom, respectively.
  • support bar 6′ has a sigmoidal shape. More specifically, a first portion 32 of bar 6′ which is proximate headrest 4′ has a concavity which is oppositely directed from the direction of the concavity of cam surfaces 18′ (i.e., as shown in Figure 4, the concavity of cam surfaces 18′ is directed up while the concavity of portion 32 of bar 6′ is substantially directed down).
  • a second portion 34 of bar 6′ which is proximate cam follower 20′ has a concavity which is directed in substantially the same direction (up) as the concavity of cam surfaces 18′.
  • bar 6′ has oppositely directed concavities and an inflection point 36 therebetween.

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 (12)

  1. Eine Vorrichtung zur Steuerung des Kippwinkels einer Kopfstütze eines Behandlungsträgers für Menschen, enthaltend:
    eine Tragstange (6), die ein erstes und ein zweites Ende besitzt mit einem Kopfstützenbefestigungsteil (4) nahe dem genannten ersten Ende, Stützmittel (10, 12) und Führungsmittel (14, 16), wobei letztere auf den Stützmitteln montiert sind, um die genannte Tragstange gleitend aufzunehmen, die genannten Führungsmittel (14, 16) sind mit einem Abschnitt der Tragstange (6), der sich zwischen dem ersten und dem zweiten Ende befindet, gleitend verbunden, so daß es der Tragstange (6) ermöglicht ist, bezüglich der Stützmittel (10, 12) zu gleiten, wobei die genannten Stützmittel (10, 12) wenigstens eine gekrümmte Kurvenfläche (18) beinhalten und an der Tragstange (6) nahe dem genannten zweiten Ende Mittel (20) befestigt sind, die der Kurvenfläche (8) der Stützmittel folgen und bewirken, daß das zweite Ende der Tragstange (6) in die Kurvenfläche der Stützmittel (18) eingreift und dieser Kurvenfläche folgt, wenn die Tragstange (6) in bezug auf die Stützmittel verschoben wird, wobei die Bewegung der Folgemittel (20) entlang der Kurvenfläche (18) den dazwischen gelegenen Abschnitt der Tragstange (6) veranlaßt, daß er in bezug auf die Führungsmittel (14, 16) gleiten kann und wobei der erste Abschnitt der Tragstange (6) entlang eines gekrümmten Weges bewegt wird, der seinen Ursprung entfernt von den Stützmitteln (10, 12) hat, derart, daß er annähernd dem Ursprung des geometrischen Ortes der Drehbewegung eines auf der Behandlungsauflage positionierten Patienten ten Patienten zu liegen kommt, wobei dadurch der Kippwinkel des Kopfstützenbefestigungsteils der Tragstange (6) gesteuert wird.
  2. Eine Vorrichtung nach Anspruch 1, bei der die Führungsmittel (14, 16) einen Stift (14) aufweisen, der ein Ende besitzt, das drehbar mit den genannten Stützmitteln verbunden ist und der Stift (14) einen Querschlitz (16) aufweist, durch den ein Abschnitt der Tragstange (6) zwischen den genannten ersten und zweiten Enden hindurchgreift und der Abschnitt in dem Querschlitz gleitbar geführt ist.
  3. Eine Vorrichtung nach Anspruch 2, enthaltend weiterhin Sperrmittel (28), die an der Tragstange (6) nahe des genannten zweiten Endes befestigt sind, um eine Gleitbeweguna der genannten Tragstange durch den Querschlitz (16) zu verhindern.
  4. Eine Vorrichtung nach Anspruch 3, bei der die Stützmittel (8, 10, 12) eine im wesentlichen flache Befestigungsplatte (8) beinhalten, auf der die erste und zweite Führungsplatte (10, 12) räumlich voneinander getrennt und zueinander parallel montiert sind.
  5. Eine Vorrichtung nach Anspruch 4, bei der das erste und zweite Ende des Stiftes (14) so angepaßt sind, daß sie drehbar in die erste bzw. zweite Platte (10, 12) eingreifen.
  6. Eine Vorrichtung nach Anspruch 5, bei der die einander gegenüberliegenden Seiten der Führungsplatten (10, 12) einen verlängerten gekrümmten Schlitz aufweisen, um die gekrümmte Kurvenfläche (18) zu bilden.
  7. Eine Vorrichtung nach Anspruch 5, bei der die genannten Folgemittel einen Stift (20) beinhalten, der am genannten zweiten Ende der Tragstange (6) angebracht ist, wobei die entgegengesetzten Enden dieses Stiftes ausgebildet sind, um in die Kurvenflächen (18) der Führungsplatten (10, 12) einzugreifen und diesen zu folgen.
  8. Eine Vorrichtung nach Anspruch 1, bei der ein mittlerer Abschnitt der gekrümmten Kurvenfläche (18) eine im wesentlichen gleichmäßige Krümmung aufweist, um so einen wesentlichen Teil des Kippungsbereiches der genannten Kopfstütze festzulegen, und bei der wenigstens ein Endteil (32) eine Krümmung aufweist, die von der im wesentlichen gleichmässigen Krümmung des genannten mittleren Abschnitts abweicht, um zu veranlassen, daß die genannte Kopfstütze sich entlang einer Kurve bewegt, deren Drehmittelpunkt verschieden ist von dem Drehmittelpunkt, wie er durch den genannten mittleren Abschnitt festgelegt ist.
  9. Eine Vorrichtung nach Anspruch 2, bei der die Bewegung der Folgemittel (20) entlang der Kurvenfläche (18) den zweiten Abschnitt der Tragstange (6) dazu veranlaßt, durch den Querschlitz (16) zu gleiten und den ersten Abschnitt des genannten Trägers dazu veranlaßt, sich entlang des gekrümmten Weges zu bewegen.
  10. Eine Vorrichtung nach Anspruch 1, bei der die Tragstange (6) sigmaförmig ausgebildet ist.
  11. Eine Vorrichtung nach Anspruch 10, bei der die gekrümmte Kurvenfläche (18) eine Konkavität aufweist, die im wesentlichen in eine erste Richtung orientiert ist und die Tragstange (6) eine erste Konkavität nahe des ersten Endes (30) aufweist, die im wesentlichen der genannten ersten Richtung entgegengesetzt orientiert ist und nahe des zweiten Endes (32) eine Konkavität aufweist, die im wesentlichen in der ersten Richtung orientiert ist und die Tragstange (6) zwischen der ersten und zweiten Konkavität einen Wendepunkt aufweist.
  12. Eine Vorrichtung nach einem der Ansprüche 4 bis 11, die auf einem Zahnarztstuhl montiert ist, der eine Stuhlrückenlehne und eine einstellbare Kopfstütze besitzt und bei der die Befestigungsplatte (18) in der genannten Stuhlrückenlehne fest angebracht ist.
EP19890103517 1988-03-04 1989-02-28 Gelenkartiger Mechanismus für Kopfstütze Expired - Lifetime EP0331122B1 (de)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US164164 1980-06-30
US296915 1981-08-27
US16416488A 1988-03-04 1988-03-04
US23396688A 1988-08-18 1988-08-18
US233966 1988-08-18
US07/285,185 US4848838A (en) 1988-08-18 1988-12-15 Curved articulating headrest support bar
US285185 1988-12-15
US07/296,915 US4863218A (en) 1988-08-18 1989-01-12 Articulated headrest mechanism

Publications (3)

Publication Number Publication Date
EP0331122A2 EP0331122A2 (de) 1989-09-06
EP0331122A3 EP0331122A3 (en) 1989-12-13
EP0331122B1 true EP0331122B1 (de) 1993-08-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890103517 Expired - Lifetime EP0331122B1 (de) 1988-03-04 1989-02-28 Gelenkartiger Mechanismus für Kopfstütze

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EP (1) EP0331122B1 (de)
DE (1) DE68907951T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10043932A1 (de) * 2000-09-06 2002-03-14 Stoll Sedus Ag Nackenstütze für einen Bürodrehstuhl
DE10253863B4 (de) * 2002-11-19 2008-07-10 Maquet Gmbh & Co. Kg Motorisch verstellbare Kopfstütze
DE202011109649U1 (de) 2011-12-30 2012-03-14 Sirona Dental Systems Gmbh Behandlungsstuhl mit einem Verstellsystem

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989341A (en) * 1958-12-08 1961-06-20 Anton Lorenz Head-rest and control
JPS56145848A (en) * 1980-04-14 1981-11-12 Morita Mfg Apparatus for adjusting inclination of head rest of treating table
US4515406A (en) * 1982-09-28 1985-05-07 Takara Company, New York, Inc. Headrest for medical treatment chair

Also Published As

Publication number Publication date
EP0331122A3 (en) 1989-12-13
DE68907951D1 (de) 1993-09-09
EP0331122A2 (de) 1989-09-06
DE68907951T2 (de) 1993-12-16

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