EP3108867B1 - Zahnarztpatientenstuhl - Google Patents

Zahnarztpatientenstuhl Download PDF

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Publication number
EP3108867B1
EP3108867B1 EP16175492.4A EP16175492A EP3108867B1 EP 3108867 B1 EP3108867 B1 EP 3108867B1 EP 16175492 A EP16175492 A EP 16175492A EP 3108867 B1 EP3108867 B1 EP 3108867B1
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EP
European Patent Office
Prior art keywords
cam
patient
carriage
seat
contour
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Application number
EP16175492.4A
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English (en)
French (fr)
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EP3108867A1 (de
Inventor
Giulio Mattiuzzo
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.)
Cefla SCARL
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Cefla SCARL
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Publication of EP3108867A1 publication Critical patent/EP3108867A1/de
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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
    • A61G15/02—Chairs with means to adjust position of patient; Controls therefor
    • 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
    • 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

Definitions

  • the present invention refers to the technical field of dental patient chairs. More particularly, the invention refers to an apparatus and a method allowing the movement of said chair, through a mechanism making use of a cam and a rounded hole inside which a carriage slides, with a carriage actuating said cam, according to the preamble of claim 1.
  • dental patient chairs must be comfortable for patients: a patient feeling comfortable is more relaxed, and for dentists working is easier.
  • the Trendelemburg position or anti-shock position, is the position in which the patient must lie in case of shock, or during the performance of special exams.
  • the patient is supine, lying so that her/his head is lower than her/his knees and her/his pelvis.
  • Dental patient chairs have been industrially manufactured for more than 100 years; patent regarding dental patient chairs are e.g. EP0477762 of Pelton & Crane , EP0253943 of Castellini , US4173372 of Reynolds .
  • a treatment chair (1) comprising a seat surface (2), a backrest (3), a base (4) and an adjusting system (7).
  • the adjustment system comprises a first guide rail (8) in the form of a first leading hole or slot and at least one second guide track (9) also in the form of a leading hole or slot.
  • a guide pin (10) engages both first and second slots.
  • the first slot (8) and the second slot (9) are arranged to one another such that upon adjustment of the adjusting system (7) between a first end position (16) and a second end position (17) of the guide bolt (10) the seat surface (2) is adjusted relative to the backrest (3).
  • the seat surface cannot be freely raised from the adjustment mechanism and access to the said mechanism is not allowed by simply oscillating upward the seat surface. On the contrary in order to take away the seat surface for allowing access to the mechanism the seat has to be disassembled from the mechanism or the mechanism has to be accessed from another side.
  • Aim of the present invention is providing a mechanism allowing to position the back rest from the upright position to the reclined position and vice versa, which is efficient and inexpensive to produce. Moreover, the mechanism produces a coordinated movement with the seat, swinging until a position ergonomically correct for the patient is reached; in case of need, the chair can swing up to Trendelemburg position.
  • a further aim is the possibility of varying in a simple and effective way the geometric law operating this movement: changing the geometry of the cam, the movement itself can be accelerated or decelerated, or anyway modified as desired.
  • a further aim is allowing to reach special positions of the patient, with pre-set angles between patient's trunk and legs.
  • the present invention consists in a mechanism having a particularly simple construction, making use of a single actuator, which does not require special tools for its production, in that moulds are not necessary, but the simple shaping of parts obtained from elements made of metal sheet is sufficient.
  • the simplified mechanism of the present invention makes use of a minimal number of components, which are reduced to six. Said components are two by two the same component, mounted in a symmetric position, therefore the components to be produced are only three. As a comparison, today known patient chairs comprise at least ten symmetrical components, which therefore have to be produced in left and right version, therefore the components to be produced are at least twenty.
  • the seat can easily be raised up with an oscillating mechanism allowing access to the said mechanism in a very simple and rapid manner similarly to a car hood.
  • the cam cooperates with the carriage by being urged with its surface against the cooperating means of the carriage by gravity.
  • Figure 1 shows a typical dental chair comprising a back rest 2, a seat 3, a base 4 and a pantograph arm 5.
  • the pantograph arm 5 allows the rise and descent of the seat 3, indicatively from a height of 360 mm to 840 mm.
  • the top end of the pantograph arm is a sort of turret supporting the mechanism for the reclining of backrest and the mechanism for the coordinated movement of the seat.
  • the chair 1 is shown with reclined backrest, nearly parallel to the floor.
  • Figure 2 shows the same chair 1 in an upright position, with the backrest 2 at about 70° with respect to the floor, and the seat 3 at about 12° with respect to the floor.
  • the upholstery was removed from the seat 3, so as to show the internal mechanism allowing the movements of the chair.
  • Figure 3 shows the same chair completely reclined in Trendelemburg position, with the backrest 2 nearly parallel to the floor, and the seat 3 positioned to slightly rise patient's legs with respect to patient's head. From the seat 3 the upholstery was removed, so as to show the internal mechanism allowing the movements of the chair.
  • Figures 4A and 4B show in section the dental chair 1 in the same position of Figure 2 , so as to clarify the operation of the movement mechanism.
  • Figures 4A and 4B shows the starting point of the movement leading to the reclining of backrest 2.
  • an arch 8 is started along the hole or slot 11 through a carriage 12.
  • the carriage can be made of other sliding elements lead along the slot 11, like e.g. slides or similar elements.
  • a wheel 9 Integral with said arch 8 through a transversal shaft, a wheel 9 engages a cam 14 present in the rising plate 10, which, having its fulcrum in the axis 13, starts to rise vertically moving the seat support 6.
  • the two cams 14 are mounted on the external sides of the frame element supporting the backrest reclining mechanism, and that each of them is simply inserted with a supporting hole on a supporting shaft, which is stationary and integral to said frame element, which is indeed the axis of fulcrum 13. This construction ensures a very simple and direct access to the cam 14, and the possibility of its fast replacement.
  • cam 14 in two parts, a supporting frame which has its steady fulcrum in the axis 13, and to which a part supporting the edge contoured according to the law of motion is releasably fixed.
  • the law of motion can be modified simply by replacing the contoured part, e.g. disassembling the seat and manually uplifting the cam 14 in order to work on the fixing of the moveable contour part to the steady part.
  • Figures 5A and 5B show a section of dental chair 1 in the same position of Figure 3 .
  • Figures 5A and 5B show the movement of wheel 9 which is now in its end-of-stroke position, so leading to the rise of support 6 supporting the upholstery.
  • the movement of the backrest 2 and of the seat 3 occur in a coordinated way, so that when the backrest descends, the angle between patient's trunk and legs progressively increases approximately from 95° to 180°.
  • the design of the cam has a geometric shape such as to link specific positions of the backrest to specific inclinations of the seat, leading to the possibility of reaching patient's positions wherein:
  • the angle between patient's trunk and thighs can be kept in the range of 95-130°, but the patient is reclined, with her/his head at a height suitable for dentist's work. This position is very comfortable for the patient, who can homogenously distribute her/his weight, and at the same time ergonomic for the dentist.
  • the cam can be designed so that the final point of the completely reclined position brings the patient to a position perfectly horizontal to the floor (patient table).

Claims (10)

  1. Mechanismus zum Bewegen von Liegestühlen (1), vorzugsweise zahnärztlichen Patientenstühlen, mit einer Rückenlehne (2) und einem Sitz (3), die relativ zueinander bewegbar sind, und wobei die Rückenlehne von einem Schwenkmechanismus getragen wird, ferner umfassend:
    - mindestens einen Nocken (14) mit einer vorgegebenen Kurvenkontur; wobei der Nocken den Sitz trägt und zumindest um eine Achse schwenkt, die im Wesentlichen einer Schwenkachse des Sitzes entspricht;
    - mindestens einen Wagen oder einen Schlitten (12);
    - mindestens ein Führungsloch oder -schlitz (11) für den Schlitten (12);
    wobei das Führungsloch oder -schlitz (11) sich im Wesentlichen in Richtung der Kontur des Nockens erstreckt,
    der Schlitten (12) zusammenwirkende Mittel mit der Kontur des Nockens (14) aufweist;
    und der Schlitten (12) durch den Schwenkmechanismus der Rückenlehne derart gleitend betätigt wird, dass, wenn der Schlitten (12) innerhalb des Führungslochs (11) oder -schlitzes mittels eines Betätigungssystems gleitet, der mit der Kontur des Nockens (14) im Eingriff stehende Schlitten (12) zumindest eine durch die Kontur des Nockens (14) selbst gesteuerte Schwingungsbewegung steuert und
    dadurch gekennzeichnet, dass
    der Nocken durch eine Oszillation frei verschiebbar ist, aus einer Position, in der er mit den genannten zusammenwirkenden Mitteln des Schlittens (12) zusammenarbeitend im Eingriff ist, in einer Position, in welcher der Nocken (14) von den genannten zusammenwirkenden Mitteln beabstandet ist.
  2. Mechanismus zum Bewegen von Liegestühlen (1) nach Anspruch 1, wobei der Nocken (14), der Schlitten (12) und das Loch oder der Schlitz (11) durch Blechstanzen in einfacher Ausführung herstellbar und vorzugsweise in zwei- oder mehrfacher Ausführung je nach Bedarf montierbar sind.
  3. Mechanismus zum Bewegen von Liegestühlen (1) nach Anspruch 1, wobei der Nocken (14), der Schlitten (12) und das Loch oder der Schlitz (11) in einfacher Ausführung hergestellt und montiert werden kann, mit Bewahrung der spezifischen Kontur in der Rechts- und Links-Version.
  4. Mechanismus zum Bewegen von Liegestühlen (1) nach Anspruch 1 bis 3, wobei der Nocken (14) eine kreisbogenförmige oder elliptische oder parabolische oder hyperbolische oder lineare Kontur aufweist, oder eine Kombination der vorhergehenden.
  5. Mechanismus zum Bewegen von Liegestühlen (1) nach einem der vorhergehenden Ansprüche, wobei der Nocken (14) eine diskontinuierliche oder wellenförmige Kontur mit Ausbuchtungen und Einbuchtungen aufweist, so dass der Patient in eine Position gebracht wird, in welcher der Patient im Wesentlichen parallel zum Boden ist (Trendelenburg) und daraufhin in einer Position, in welcher der Patient seinen Kopf in der von seinem Zahnarzt gewünschten Höhe hat, jedoch der Patientenrumpf einen Winkel zwischen 105° und 130° gegenüber seiner Oberschenkel (maximale Komfortstellung, Kippstellung) bildet.
  6. Mechanismus zum Bewegen von Liegestühlen (1) nach Anspruch 1 bis 3, wobei die Kurvenform (14) erlaubt, den Patienten in einer Position perfekt parallel zum Boden zu bringen, wie auf einem Patiententisch.
  7. Mechanismus zum Bewegen von Liegestühlen (1) nach einem der vorhergehenden Ansprüche, wobei das Betätigungssystem ausgewählt ist aus der Gruppe bestehend aus mindestens einem Getriebemotor (7), einem hydraulischen und/oder pneumatischen und/oder manuellen System.
  8. Mechanismus nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Nocken oder die beiden Nocken außerhalb eines tragenden Zentralrevolvers jeweils auf einer Schwenkachse auf der entsprechenden Seite des Revolvers gelagert ist/sind, wobei die Achsen koaxial zueinander sind.
  9. Mechanismus nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass dieser Nocken oder diese Nocken bestehen aus im Wesentlichen ebenen Platten, die entsprechend der Nockenkontur geformt sind, und von der Außenseite des Stuhlauflagemechanismus durch andere Nocken mit unterschiedlichen Konturen austauschbar sind, um die Bewegungsgesetze zwischen Rückenlehne und Sitz zu verändern.
  10. Verfahren zum Verstellen der Rückenlehne (2) und des Sitzes (3) von Liegestühlen (1) relativ zueinander, vorzugsweise von zahnärztlichen Patientenstühlen, bei Verwendung eines Mechanismus nach den Ansprüchen 1 bis 9, wobei die Bewegungsmöglichkeit von Rückenlehne und Sitz von der geometrischen Form des Nockens (14) abhängt.
EP16175492.4A 2015-06-23 2016-06-21 Zahnarztpatientenstuhl Active EP3108867B1 (de)

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EP3108867B1 true EP3108867B1 (de) 2018-12-05

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CN (1) CN106264962B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800009691A1 (it) 2018-10-23 2020-04-23 Cefla Societa' Coop Poltrona odontoiatrica

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011109649U1 (de) * 2011-12-30 2012-03-14 Sirona Dental Systems Gmbh Behandlungsstuhl mit einem Verstellsystem

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7507514U (de) * 1975-08-07 Ritter Ag Patientenstuhl für Dentalzwecke
US4173372A (en) 1977-10-11 1979-11-06 Gary Reynolds Dental chair
IT1200176B (it) 1986-07-18 1989-01-05 Castellini Spa Struttura per poltrone con sedile e schienale mobili, in particolare per uso odontoiatrico
US5131717A (en) 1990-09-28 1992-07-21 The Pelton & Crane Company Reclining chair having a movable seat back and a movable seat bottom
DE4135948C2 (de) * 1991-10-31 1993-12-23 Rolf Voelkle Stuhl, insbesondere Bürodrehstuhl
JPH08257062A (ja) * 1995-03-27 1996-10-08 Koichi Suzumori 腰掛けた状態から起立できる椅子の構造
JP3451581B2 (ja) * 1998-06-30 2003-09-29 株式会社イトーキクレビオ 椅 子
CN1857135A (zh) * 2005-05-08 2006-11-08 金属座椅有限责任公司 具有使得座位和靠背同步运动联接方式的可调型办公扶手椅结构
CN201445164U (zh) * 2009-07-24 2010-05-05 张雨 靠背与座位联动可调仰角机构

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011109649U1 (de) * 2011-12-30 2012-03-14 Sirona Dental Systems Gmbh Behandlungsstuhl mit einem Verstellsystem

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CN106264962B (zh) 2019-12-20
CN106264962A (zh) 2017-01-04

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