EP0659392B1 - Verstellbarer Stuhl für medizinische Verwendung - Google Patents

Verstellbarer Stuhl für medizinische Verwendung Download PDF

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Publication number
EP0659392B1
EP0659392B1 EP19930830516 EP93830516A EP0659392B1 EP 0659392 B1 EP0659392 B1 EP 0659392B1 EP 19930830516 EP19930830516 EP 19930830516 EP 93830516 A EP93830516 A EP 93830516A EP 0659392 B1 EP0659392 B1 EP 0659392B1
Authority
EP
European Patent Office
Prior art keywords
seat
hinged
legrest
chair
bar linkage
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
EP19930830516
Other languages
English (en)
French (fr)
Other versions
EP0659392A1 (de
Inventor
Gino Lenzi
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.)
TECNODENT S.P.A.
Original Assignee
TECNODENT SpA
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 TECNODENT SpA filed Critical TECNODENT SpA
Priority to EP19930830516 priority Critical patent/EP0659392B1/de
Priority to DE1993617052 priority patent/DE69317052T2/de
Publication of EP0659392A1 publication Critical patent/EP0659392A1/de
Application granted granted Critical
Publication of EP0659392B1 publication Critical patent/EP0659392B1/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
    • A61G15/02—Chairs with means to adjust position of patient; Controls therefor

Definitions

  • the invention relates to an adjustable chair for use in the field of medicine, especially dentistry.
  • the chair exhibits three basically flat portions, namely a backrest, a seat and a legrest, which are hinged in sequence.
  • One solution attempts to increase movement range while reducing the mass of the base in constraining an end of the surface defining the seat of the chair to the base by means of a motorised four-bar linkage.
  • This solution actually increases the height range of the chair, bringing the patient's head to a height whereat the doctor or dentist can operate comfortably, as well as enabling the chair to be brought down to a height which presents no difficulty to even the shortest patient when climbing into or out of it.
  • the tilt axis of the chair is beneath the patient's knees. Thanks to its ability to bring the patient's head down very low, a dentist can operate while sitting in a normal chair.
  • This adjustable chair is not able to achieve a very low height, because the parts of the chair or its base interfere in the adjustments.
  • the invention therefore proposes a dentist's chair wherein it is possible to obtain large height adjustments by means of a kinematism which keeps the chair on a same vertical axis independently of any angular adjustments made on the constituent parts of the chair itself.
  • a further aim of the invention is to be able to adjust the chair to a very low height without the parts of the chair or its base interfering in the adjustments.
  • the adjustable chair is of known type and comprises a base 1 to which are hinged: movement and adjusting means 5 supporting a seat 2 to which are hinged, at their ends, a backrest 3 and a legrest 4.
  • movement and adjusting means 5 supporting a seat 2 to which are hinged, at their ends, a backrest 3 and a legrest 4.
  • the chair is shown without padding so that the structures composing the object of the invention can be more clearly described herein.
  • the movement and adjusting means 5 enable the seat 2 to be raised and lowered vertically by means of a ratiomotor 9 between a minimum and a maximum position with respect to a reference plane P on which the base 1, usually constituted by the surgery floor.
  • the movement and adjustment means 5 are constituted (see figures 1 and 2) by a first bar linkage 6 with ends A-B-C-D and a second bar linkage 7 with ends at C-D-E-F, all of equal length and constrained to each other at their common smaller side, C-D.
  • the two bar linkages 7 and 7 are each constituted by two arm pairs 6a, 6b and 7a, 7b, equipped at their common side C-D, with a parallel pair of pivots 33 and 34 which are rotatable about axis C-D.
  • the pivots 33 and 34 define the ends of the smaller side C-D and have centrally inserted on them a pair of parallel and axially fixed bushings 35 and 36 realising a rigid connecting frame for the arm 6a, 6b, 7a, 7b ends of the relative bar linkages 6 and 7.
  • bushings 37 and 38 are arranged at the sides of the bushings 35 and 36, which bushings 37 and 38 are rotatable about the pivots 33 and 34, to which bushings 37 and 38 the ends of the arms 6a, 6b, 7a, 7b are solid.
  • the first bar linkage 6 is hinged at its smaller side A-B to the base 1 and is thus mobile with respect to plane P by a variable angle alpha.
  • the second bar linkage 7 is constrained, by means of its smaller side E-F, to an end of the seat 2.
  • the smaller side E-F is hinged to a frame 19, which is constituted by two vertical columns 19a and 19b on which the second bar linkage 7 is hinged, and by an upper support 19c, solid to the colums and hinged, at VB, to the front end of the seat 2.
  • pair of bidirectional kinematic connectors 8 are interpositioned between the first 6 and the second bar linkages 7.
  • These bidirectional kinematic connectors 8 are each solid, one to greater base A-D and another to greater base F-C of the bar linkages 6 and 7 such as to determine at an angular value alpha of the first bar linkage 6 a consequent angular value 2 alpha between the facing greater sides B-C and E-D of the two bar linkages 6 and 7.
  • the seat 2 can be raised while all the time staying on a same vertical axis, indicated by Y (see figures 1, 4, 5).
  • the bidirectional kinematic connectors 8 are constituted by two enmeshed pairs of cogged sectors 10 and 11. Each pair of cogged sectors 10 and 11 is solid to a relative bushing 37 and 38, whereat the relative arm 6a and 7a belonging to the relative bar linkage 6 and 7 is fixed.
  • the motor 9 powering the first and second bar linkages 6 and 7 is constituted by a known ratiomotor 13 activating a worm screw 14 coupled with a threaded bushing 15 hinged to the central bushing 35 of the second bar linkage 7.
  • the ratiomotor 13 and the lower end of the worm screw 14 are hinged to the base 1, as can be seen in figures 2, 4 and 5.
  • the seat 2 is provided with two motors 17 and 18 in order to guarantee tilt adjustment of the seat 2, the backrest 3 and the legrest 4.
  • the first of the motors 17 is a ratiomotor of known type, supported on the frame 19 and acting on the seat 2 to tilt it with respect to plane P. It can also bring the patient into the Trendelemillian position; that is, with the head lower than the legs.
  • the second ratiomotor 18 is structurally the same as the first 17 but is supported directly on the front part of the seat 2 and acts, by means of the known worm screw 40 - threaded bushing 41 coupling, on the backrest 3 so as to tilt it independently of the seat.
  • the backrest 3 is hinged at two points: first, at LL, by a rod 43 connecting the lower end of the backrest 3 to the seat 2, and second, at H, directly to the end of the backrest 3 through the threaded bushing 41.
  • Movements between the backrest 3 and the legrest 4 are coordinated by a first horizontal rod 20 hinged, at one or its ends, to the end of the backrest 3 linked to the bushing 41, while the other of its ends is slidably inserted in a fork 21.
  • the fork 21 is provided at its other end with a second horizontal rod 22 hinged at its free end to the upper end of the legrest 4, and thus can be adjusted by pushing or traction (see arrow N in figures 4 and 5) to correspond with the inclination of the backrest 3.
  • the legrest 4 is lowered, and vice versa.
  • 23 denotes springs acting between the first rod 20 and the fork 21 which springs keep the rod 20 and the fork 21 close together, so that the rod 20 cannot slide axially internally of the fork 21, except in a special case which will be described hereinunder.
  • Figures 4 and 5 show how the seat 2 can be lowered until it is very close to plane P, thanks to the closeability of the bar linkages: for this reason, as well as to prevent the vertical legrest 4 stopping the descent of the chair, adjustment means 24 are provided to incline the legrest 4 gradually as the seat 2 descends.
  • the adjustment means 24 are positioned between the seat 2 and the second bar linkage 7 and act when the seat is lowered towards a minimum height configuration of the two bar linkages 6 and 7.
  • the adjustment means 24 are in fact a first L-shaped arm 25 pivoted at an intermediate point to the lower frame 19 and superiorly provided with a first cam-follower roller 26 in contact with a relative cam device 27 fixed to the second rod 22 linked with the legrest 4.
  • the first L-shaped arm 25 is hinged at M to the end of a second arm 28 provided with a second cam-follower idle roller 29 at its free end, which, when the seat 2 and therefore the bar linkages 6 and 7 are lowered, contacts a fixed arc-shaped striker 30 exhibited on the greater side F-C of the second bar linkage 7.
  • This contact causes the second arm 28 to rotate the first L-shaped arm in an anticlockwise direction (see figures 4 and 5), which arm 25 in turn pushes on the cam device 27 so a to advance the second rod 22 (see arrow R in figures 4 and 5), which then tilts the legrest 4.
  • the backrest 3 stays as it was before: to stop it from following the movements of the legrest 4, the first rod 20 and the fork 21 are distanced one from the other by the sliding of the first rod 20 internally of the fork 21.
  • the two elements 20 and 21 are held by the spring 23 which stretches to enable the sliding and distancing of the first rod 20 with respect to the fork 21 up until there is an adjustment of the legrest 4.
  • the spring 23 causes the first rod 20 and fork 21 to retreat into the original configuration.
  • the fork 21 is solid to an arched support structure 31 developing below the front end of the seat 2.
  • the support structure 31 exhibits a straight portion 32 hinged at G to the seat 2, which develops in the same direction as the legrest 4 so that it crosses the end of the seat 2.
  • This type of hinge is designed to allow a correct rotation of the legrest 4 without the patient's legs sliding on the legrest 4.
  • the centre of rotation O of the legrest 4 corresponds substantially to the point of rotation of the patient's knees, thanks to the special arched shape of the support structure 31.
  • a chair of this type can be operated by means of an external command panel acting on all of the ratiomotors 13, 17 and 18 in order to raise the chair from a position corresponding to plane P in figures 4, 5 and 7, to a position of maximum height with respect to plane P, see figures 1 and 2.
  • the chair's configuration can be changed by activating the third ratiomotor 18, which enables the backrest and the legrest to be tilted, and the second ratiomotor 17, which enables the chair to be brought into the Trendelemillian position.
  • All of the ratiomotors are interconnected by means of endrun microswitches (not illustrated since of known type) which cut off the motor when a position of minimum or maximum excursion has been reached, and then switch the power to another ratiomotor, should the dentist wish to continue the adjustment operation.
  • the chair as it is structured herein allows a wide variety of movements, and it can especially be adjusted to maximum and minimum heights which exceed the performance of chairs presently in use, thanks to the kinematism of the double bar linkage.
  • the adjustment is effected while the seat remains on the same vertical axis, which makes the dentist's work easier if the patient has to be moved up or down during operations, with the dental instruments already set out in ideal positions for the dentist's reach.

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  • Health & Medical Sciences (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 (5)

  1. Verstellbarer Stuhl zur Verwendung im medizinischen Bereich, insbesondere im zahnärztlichen Bereich, enthaltend eine Basis (1) für einen Sitz (2), an welchen Sitz (2) eine Rückenlehne (3) und eine Beinstütze (4) angelenkt sind; Bewegungs- und Verstellmittel (5), vorgesehen wenigstens für den Sitz (2) und angelenkt an die Basis (1) und an ein Ende des Sitzes (2), wobei die Bewegungs- und Verstellmittel (5) mit einem Antriebsmittel (9) versehen sind und die Aufgabe haben, den Sitz (2) anzuheben und zu senken, und zwar zwischen einer minimalen und einer maximalen Höhe im Verhältnis zu einer Bezugsebene (P), auf welcher sich die Basis (1) befindet; wobei die Bewegungs- und Verstellmittel (5) aus einem ersten Gelenkviereck (6, A-B-C-D) und einem zweiten Gelenkviereck (7, C-D-E-F) gebildet werden, beide von der gleichen Länge und an ihrer gemeinsamen schmaleren Seite (C-D) gegenseitig miteinander verbunden; wobei das erste Gelenkviereck (6) ausserdem an seinem die andere schmale Seite (A-B) bildenden Ende an die Basis (1) angeschlossen und um einen Winkel (α) beweglich ist und das zweite Gelenkviereck (7) mit der verbleibenden schmalen Seite (E-F) an ein Ende des Sitzes (2) angeschlossen ist; wobei zweiseitige kinematische Verbindungsteile (8) zwischen dem ersten (6) und dem zweiten (7) Gelenkviereck vorgesehen sind, und wobei jedes zweiseitige kinematische Verbindungsteil (8) fest an eine entsprechende breitere Seite (A-D, F-C) der Gelenkvierecke (6, 7) angeschlossen ist, so dass bei einem Winkel (α) des ersten Gelenkvierecks (6) ein Winkel (2 α) bestimmt wird, welcher das Doppelte des ersten (α) zwischen den einander zugewandten breiteren Seiten (B-C, E-D) der beiden Gelenkvierecke (6, 7) beträgt, dadurch gekennzeichnet, dass die zweiseitigen kinematischen Verbindungsteile (8) aus zwei Paaren von ineinandergreifenden verzahnten Segmenten (10, 11) gebildet werden; wobei jedes genannte Paar von ineinandergreifenden verzahnten Segmenten (10, 11) fest mit einer entsprechenden Buchse (37, 38) verbunden ist, die einen Endpunkt der breiteren Seiten (A-D, F-C) des entsprechenden Gelenkvierecks (6 oder 7) bildet, und dadurch, dass das Antriebsmittel (9) ein geradliniger Antrieb ist, dessen Enden an die Basis (1) und an eine zentrale Buchse (35) angelenkt sind, welche einen Endpunkt des zweiten Gelenkvierecks (7) ungefähr an dessen Drehachse (C) beschreibt.
  2. Stuhl nach Patentanspruch 1, dadurch gekennzeichnet, dass das Antriebsmittel (9) aus einem Getriebemotor (13) besteht, der eine Endlosschnecke (14) aktiviert, welche schraubbar mit einer Gewindebuchse (15) verbunden ist, letztere angelenkt an die genannte mittlere Buchse (35); wobei der Getriebemotor (13) und das Ende der Endlosschnecke (14) an die genannte Basis (1) angelenkt sind.
  3. Stuhl nach Patentanspruch 1, dadurch gekennzeichnet, dass der Sitz (2) mit zwei zweiten Antriebsmitteln (17, 18) versehen ist, von denen das erste (17) von einem Rahmen (19) getragen wird, angeordnet zwischen dem Sitz (2), an welchen dieser angelenkt ist, und dem zweiten Gelenkviereck (7), welches ebenfalls an den Rahmen (19) angelenkt ist, welches Antriebsmittel (17) die Schrägstellung des Sitzes (2) im Verhältnis zu der Ebene (P) bewirkt; wobei das zweite (18), das identisch mit dem ersten (17) ist, direkt von dem Sitz (2) getragen wird und auf die Rückenlehne (3) wirkt, so dass diese unabhängig von der Neigebewegung des Sitzes (2) ihrerseits schräggestellt wird; wobei die Rückenlehne (3) weiterhin mit der Beinstütze (4) verbunden ist, und zwar mit Hilfe einer ersten horizontalen Stange (20), angelenkt mit einem Ende an das Ende der Rückenlehne (3) und mit dem anderen Ende gleitbar in eine Gabel (21) eingeschoben, welche Gabel (21) an ihrem anderen Ende eine zweite Stange (22) aufweist, angelenkt mit ihrem freien Ende an ein Ende der Beinstütze (4), so dass die Schrägstellung der Beinstütze (4) entsprechend zu jener der Rückenlehne (3) reguliert werden kann; und wobei eine Feder (23) vorgesehen ist, die zwischen der ersten Stange (20) und der Gabel (21) wirkt, um die erste Stange (20) und die Gabel (21) dicht zusammen zu halten.
  4. Stuhl nach Patentanspruch 3, dadurch gekennzeichnet, dass Verstellmittel (24) für die Schrägstellung der Beinstütze (4) zwischen dem Sitz (2) und dem zweiten Gelenkviereck (7) wirken, wenn sich der Sitz (2) im Verhältnis zu der Ebene (P) in der Darstellung der Mindesthöhe befindet; wobei die Verstellmittel (24) aus einem ersten L-förmig ausgelegten Arm (25) gebildet werden, angelenkt in einem mittleren Punkt an den Rahmen (19) und oben mit einer ersten leerlaufenden Exzenterrolle (26) versehen, die sich mit einer Nockenvorrichtung (27) im Kontakt befindet, welche an der zweiten, an die Beinstütze (4) angeschlossenen Stange (24) befestigt ist; und wobei der erste Arm (25) mit einem freien unteren Ende (M) an das Ende einer zweiten leerlaufenden Exzenterrolle (29) angelenkt ist, welche auf ein festes Anschlagelement (30) trifft, das von dem zweiten Gelenkviereck (7) aufgewiesen wird, wenn der Sitz (2) sich in seiner Mindesthöhe befindet, so dass eine Umdrehung des erstes Armes (25) bewirkt und somit die Beinstütze (4) schräggestellt wird.
  5. Stuhl nach Patentanspruch 1, dadurch gekennzeichnet, dass die Beinstütze (4) fest mit einer gebogenen Tragstruktur (31) verbunden ist, die unterhalb des vorderen Endes des Sitzes (2) verläuft und einen geradlinigen Abschnitt (32) aufweist, der in (G) an den Sitz (2) angelenkt ist, so dass das Ende des Sitzes (2) überbrückt wird.
EP19930830516 1993-12-22 1993-12-22 Verstellbarer Stuhl für medizinische Verwendung Expired - Lifetime EP0659392B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19930830516 EP0659392B1 (de) 1993-12-22 1993-12-22 Verstellbarer Stuhl für medizinische Verwendung
DE1993617052 DE69317052T2 (de) 1993-12-22 1993-12-22 Verstellbarer Stuhl für medizinische Verwendung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19930830516 EP0659392B1 (de) 1993-12-22 1993-12-22 Verstellbarer Stuhl für medizinische Verwendung

Publications (2)

Publication Number Publication Date
EP0659392A1 EP0659392A1 (de) 1995-06-28
EP0659392B1 true EP0659392B1 (de) 1998-02-18

Family

ID=8215284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930830516 Expired - Lifetime EP0659392B1 (de) 1993-12-22 1993-12-22 Verstellbarer Stuhl für medizinische Verwendung

Country Status (2)

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EP (1) EP0659392B1 (de)
DE (1) DE69317052T2 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596982A (en) * 1969-05-15 1971-08-03 Surgical Mechanical Research I Patient{3 s chair
US3804460A (en) * 1972-05-30 1974-04-16 Pelton & Crane Co Power operated treatment chair
DE3545446A1 (de) * 1985-12-20 1987-07-02 Kaltenbach & Voigt Hydraulische steuereinrichtung fuer einen behandlungsstuhl
GB9209787D0 (en) * 1992-05-06 1992-06-17 Robert Pringle Engineers Ltd Jacks and dentists or other chairs

Also Published As

Publication number Publication date
DE69317052D1 (de) 1998-03-26
DE69317052T2 (de) 1998-06-10
EP0659392A1 (de) 1995-06-28

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