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EP1066169A2 - Actuating and locking system for positioning a bed or seat mobile elements - Google Patents

Actuating and locking system for positioning a bed or seat mobile elements

Info

Publication number
EP1066169A2
EP1066169A2 EP99911854A EP99911854A EP1066169A2 EP 1066169 A2 EP1066169 A2 EP 1066169A2 EP 99911854 A EP99911854 A EP 99911854A EP 99911854 A EP99911854 A EP 99911854A EP 1066169 A2 EP1066169 A2 EP 1066169A2
Authority
EP
European Patent Office
Prior art keywords
seat
motor
bed
rod
control device
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.)
Granted
Application number
EP99911854A
Other languages
German (de)
French (fr)
Other versions
EP1066169B1 (en
Inventor
Jean-François PIAULET
Laurent Groussin
Pascal Moulin
Hugues Legras
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.)
P G A Electronic
Original Assignee
P G A Electronic
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 P G A Electronic filed Critical P G A Electronic
Publication of EP1066169A2 publication Critical patent/EP1066169A2/en
Application granted granted Critical
Publication of EP1066169B1 publication Critical patent/EP1066169B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C20/00—Head -, foot -, or like rests for beds, sofas or the like
    • A47C20/04—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination
    • A47C20/041—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination by electric motors
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/0242—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by electric motors
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/025—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by means of a rack-and-pinion or like gearing mechanism

Definitions

  • the invention relates to an actuation system for modifying the position of the movable elements of a seat or a bed.
  • the invention finds applications in all fields using a seat or a bed whose movable elements can be actuated electrically, according to the needs or the comfort of the user.
  • the invention applies to seats intended for the transport of passengers such as airplane seats, seats for the disabled, dentists' seats, medical seats or beds, electric stretchers, etc.
  • reclining back seats or reclining beds are used either for the comfort of users, such as airplane seats, or for practical reasons, such as dentists' seats or seats for the disabled.
  • the inclination of the seat backs (or beds) is obtained by an actuator produced from a system with wheel (s) and worm screw driven by a motor.
  • an actuator is described in particular in US Pat. No. 4,759,587.
  • irreversibility blocking the kinematics
  • the efficiency of the system is necessarily reduced. The implementation of such a system therefore results in a compromise between the irreversibility and the efficiency of the actuator.
  • the coefficients of friction which determine the efficiency and the irreversibility of this type of actuators fluctuate as a function of several parameters relating to the materials constituting the actuator; they fluctuate, in particular, depending on the temperature and the nature of the lubrication of these materials.
  • the object of the invention is precisely to remedy the drawbacks of the actuators described above. To this end, it offers an electric actuator whose irreversibility (blocking of the kinematics) is independent of the efficiency and obtained by a blocker with lack of current mounted in parallel on a motor and supplied with energy by the same control device as the engine.
  • the invention relates to a system for modifying the position of the movable elements of a bed or of a seat comprising: • mechanical displacement means of a first movable element relative to a second fixed element or movable from the bed or the seat, "actuation means fixed on the seat or the bed to activate or block said means for moving the first element, characterized in that the actuation and locking means comprise: • an electric motor powered by a control device, • a rod driven by the motor, • an undercurrent blocker, ensuring the blocking of the rod, mounted in parallel with the electric motor and connected to the control device,
  • the lack of current blocker is a brake which blocks the rod when it is not electrically supplied and which allows movement of the rod when it is supplied.
  • the transmission system is a reduction gear with straight gears.
  • the motor is a rotary motor driving the rod in a rotational movement.
  • FIG. 1 schematically shows an armchair whose backrest tilt is obtained by means of the actuation and locking system of the invention
  • FIG. 2 shows the block diagram of the actuation and locking system of the invention.
  • FIG. 1 shows an example of a seat with a reclining backrest provided with the system for modifying and retaining the inclination of the backrest, according to the invention.
  • the invention will be described in its application to a seat with reclining back. It should be noted, however, that the system of the invention can be implemented for a bed or a seat including one or more mobile elements (headboard, railing, elevation system, backrest, support -head, legrest, lumbar support, etc.) can change position.
  • mobile elements headboard, railing, elevation system, backrest, support -head, legrest, lumbar support, etc.
  • the backrest position modification system shown in FIG. 1, comprises mechanical means 3 for moving the backrest 1 and actuation and locking means 4 intended to actuate and / or block these means of movement 3.
  • these actuation and locking means, or actuator respond to a command from the user to lower or straighten the seat back 1 relative to the seat 2 of this seat.
  • FIG. 2 shows, in more detail, an example of an actuator of the invention.
  • This actuator comprises an electric motor 5 on which is fixed a transmission rod 6 and whose role is to cause the movement of this rod 6.
  • This transmission can be, for example, a rotation.
  • the motor 5 is supplied with energy by a control device 9.
  • This control device 9 receives a source voltage V s transmitted to the system by the diode CRI.
  • the actuator further comprises a lack of current blocker 7, supplied with voltage by the control device 9.
  • the role of this blocker is to authorize the movement of the rod 6 when it is supplied by the device command 9 and at on the contrary, to prohibit the movement of the rod 6 when it is no longer supplied.
  • This lack of current blocker 7 may be, for example, a lack of current brake or an electromagnet.
  • the motor 5 and the blocker 7 are mounted in parallel and are supplied by the same control device 9.
  • control device 9 makes it possible to simultaneously supply the motor 5 and the blocker 7 with a voltage of the same value (which may be, for example, 24 volts) to generate the movement.
  • the device allows simultaneous cutting of the power supply to the motor 5 and the power supply to the blocker 7 to block the movement.
  • Such an actuator has almost total irreversibility, which means that the irreversibility of the actuator is greater than its dynamic capacity.
  • the control device 9 is controlled by the voltage V s . It behaves so as to keep the motor voltage constant and at the same value as the voltage V s (when the motor becomes generator following a driving load or stopping the engine).
  • the control device 9 acts as soon as the voltage of the actuator V a is greater than the source voltage V s .
  • the transistor Q1 (which is, for example, a bipolar transistor) becomes “on” so as to drain the energy coming from the motor become generator; the transistor Q1 naturally becomes “blocked” again when the source voltage V s becomes again greater than the voltage of the actuator V a , therefore when the motor is no longer generator.
  • the engine stopping phase may be a special case of the driving load; indeed, the source voltage V s goes to around 0 Volt, which makes the transistor Ql passing from the moment and as long as V a is greater than V s +0.6 Volt, in the case of the assembly of FIG. 2 .
  • the rod 6 is connected, at its end, to a transmission system 8 which drives the mechanical displacement means 3 of the backrest 1.
  • this transmission system 8 is a reduction gear with straight pinions which has the advantage of offering maximum efficiency and, consequently, a reduction in the electrical consumption, the volume and the weight of the actuation system with respect to the worm screw systems of the prior art.
  • the invention has the advantage of allowing a large reduction in the vacuum supply current and its fluctuations compared to the worm screw system of the prior art, due to the elimination of significant friction in the gears, varying depending on the temperature and the risk of seizure after a prolonged stop.
  • the relationship between the energy consumed and the torque delivered is optimized and non-fluctuating in the system of the invention.
  • the value of the current is a faithful image of the mechanical energy transmitted.
  • the system comprises a mechanical device 10, such as a lever, which makes it possible to reverse or mechanically reinforce the two states of the blocker to compensate for a possible defect in the control device 9 or to obtain safety positions, for example, in the case of passenger seats of an aircraft, subject to the regulations of the Federal Office of Aeronautics FAA and the office of member countries of the JAA (aeronautical authorities which require that they be in an upright position during takeoff and landing of the aircraft.
  • a mechanical device 10 such as a lever

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Nursing (AREA)
  • Seats For Vehicles (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Invalid Beds And Related Equipment (AREA)
  • Transmission Devices (AREA)
  • Chairs Characterized By Structure (AREA)

Abstract

The invention concerns an electrical actuator for a seat with reclinable back wherein irreversibility (or the kinematics locking) and efficiency are independent of each other, the efficiency being provided by a reduction spur gear (8) and irreversibility by a current outage lock (7), connected in parallel on an electric motor (5), and powered by the same control device (9) as the motor.

Description

SYSTEME D'ACTIONNEMENT ET DE -VERROUILLAGE ACTUATION AND LOCKING SYSTEM
POUR LE POSITIONNEMENT DES ELEMENTS MOBILESFOR THE POSITIONING OF MOBILE ELEMENTS
D'UN LIT OU D'UN SIEGEBED OR SEAT
DESCRIPTIONDESCRIPTION
Domaine de 1 'inventionField of the invention
L'invention concerne un système d' actionnement permettant de modifier la position des éléments mobiles d'un siège ou d'un lit.The invention relates to an actuation system for modifying the position of the movable elements of a seat or a bed.
L'invention trouve des applications dans tous les domaines utilisant un siège ou un lit dont les éléments mobiles peuvent être actionnés électriquement, en fonction des besoins ou du confort de l'utilisateur. En particulier, l'invention s'applique aux sièges destinés au transport de passagers tels que les sièges d'avion, aux sièges pour handicapés, aux sièges de dentistes, aux sièges ou lits médicaux, aux civières électriques, etc.The invention finds applications in all fields using a seat or a bed whose movable elements can be actuated electrically, according to the needs or the comfort of the user. In particular, the invention applies to seats intended for the transport of passengers such as airplane seats, seats for the disabled, dentists' seats, medical seats or beds, electric stretchers, etc.
Etat de la techniqueState of the art
Dans de nombreux domaines, des sièges à dossiers inclinables ou des lits inclinables sont utilisés soit pour le confort des usagers, comme les sièges d'avion, soit pour des raisons pratiques, comme les sièges de dentistes ou les sièges pour handicapés.In many areas, reclining back seats or reclining beds are used either for the comfort of users, such as airplane seats, or for practical reasons, such as dentists' seats or seats for the disabled.
Classiquement, l'inclinaison des dossiers de sièges (ou lits) est obtenue par un actionneur réalisé à partir d'un système à roue (s) et vis sans fin entraîné par un moteur. Un tel actionneur est décrit notamment dans le brevet US-4 759 587. Cependant, dans le cas de ces actionneurs à vis sans fin, le blocage de la cinématique (appelé par la suite irréversibilité) est relativement difficile à obtenir ; aussi, pour atteindre une bonne irréversibilité, le rendement du système est nécessairement diminué. La mise en oeuvre d'un tel système entraîne donc un compromis entre l'irréversibilité et le rendement de 1 'actionneur .Conventionally, the inclination of the seat backs (or beds) is obtained by an actuator produced from a system with wheel (s) and worm screw driven by a motor. Such an actuator is described in particular in US Pat. No. 4,759,587. However, in the case of these worm actuators, blocking the kinematics (hereinafter called irreversibility) is relatively difficult to obtain; also, to achieve good irreversibility, the efficiency of the system is necessarily reduced. The implementation of such a system therefore results in a compromise between the irreversibility and the efficiency of the actuator.
Par ailleurs, les coefficients de frottement qui déterminent le rendement et l'irréversibilité de ce type d' actionneurs fluctuent en fonction de plusieurs paramètres relatifs aux matériaux constituant l' actionneur ; ils fluctuent, en particulier, en fonction de la température et de la nature de la lubrification de ces matériaux.Furthermore, the coefficients of friction which determine the efficiency and the irreversibility of this type of actuators fluctuate as a function of several parameters relating to the materials constituting the actuator; they fluctuate, in particular, depending on the temperature and the nature of the lubrication of these materials.
Ainsi, lorsqu'un actionneur à vis sans fin est utilisé pour un siège ayant une charge statique importante, c'est-à-dire supérieure ou égale à la capacité dynamique de l' actionneur lui-même, il est difficile d'assurer une bonne irréversibilité ; or, pour obtenir une irréversibilité correcte, il faut accepter de diminuer le rendement ; cet actionneur a donc un mauvais rendement.Thus, when a worm actuator is used for a seat with a high static load, that is to say greater than or equal to the dynamic capacity of the actuator itself, it is difficult to ensure good irreversibility; however, to obtain a correct irreversibility, it is necessary to agree to reduce the yield; this actuator therefore has poor efficiency.
De plus, il est à noter que plus le rendement est mauvais, plus la valeur du courant nécessaire à l' actionneur à vide est élevée et fluctuante, du fait des frottements ; la sensibilité à une charge précise est donc très faible. En conséquence, pour les mouvements des sièges qui doivent assurer une maîtrise du couple généré, c'est-à-dire une maîtrise de la force maximum à ne pas dépasser pour des raisons de sécurité, il est très difficile, voire impossible, de régler le seuil de sécurité à ne pas dépasser, ce seuil devant, par ailleurs, être suffisamment important pour manoeuvrer le siège en charge nominale, quelle que soit la situation.In addition, it should be noted that the worse the efficiency, the higher and more fluctuating the value of the current required by the vacuum actuator, due to friction; the sensitivity to a precise load is therefore very low. Consequently, for seat movements which must ensure control of the generated torque, that is to say control of the maximum force not to be exceeded for safety reasons, it is very difficult, if not impossible, to adjust the safety threshold not to be exceeded, this threshold in front of, moreover, be large enough to maneuver the seat under nominal load, whatever the situation.
En outre, un mauvais rendement de l' actionneur nécessite une source d'énergie importante, ce qui entraîne un accroissement du poids, du volume, et de l'échauffe ent du système et, par conséquent, un coût important .In addition, poor performance of the actuator requires a large source of energy, which leads to an increase in weight, volume, and heating of the system and therefore, a significant cost.
Exposé de l'inventionStatement of the invention
L'invention a justement pour but de remédier aux inconvénients des actionneurs décrits précédemment. A cette fin, elle propose un actionneur électrique dont l'irréversibilité (blocage de la cinématique) est indépendante du rendement et obtenue par un bloqueur à manque de courant monté en parallèle sur un moteur et alimenté en énergie par le même dispositif de commande que le moteur.The object of the invention is precisely to remedy the drawbacks of the actuators described above. To this end, it offers an electric actuator whose irreversibility (blocking of the kinematics) is independent of the efficiency and obtained by a blocker with lack of current mounted in parallel on a motor and supplied with energy by the same control device as the engine.
De façon plus précise, l'invention concerne un système de modification de la position des éléments mobiles d'un lit ou d'un siège comportant : •des moyens de déplacement mécaniques d'un premier élément mobile par rapport à un second élément fixe ou mobile du lit ou du siège, «des moyens d'actionnement fixés sur le siège ou le lit pour activer ou bloquer lesdits moyens de déplacement du premier élément, caractérisé en ce que les moyens d'actionnement et de verrouillage comprennent : • un moteur électrique alimenté par un dispositif de commande, • une tige entraînée par le moteur, • un bloqueur à manque de courant, assurant le blocage de la tige, monté en parallèle avec le moteur électrique et relié au dispositif de commande,More specifically, the invention relates to a system for modifying the position of the movable elements of a bed or of a seat comprising: • mechanical displacement means of a first movable element relative to a second fixed element or movable from the bed or the seat, "actuation means fixed on the seat or the bed to activate or block said means for moving the first element, characterized in that the actuation and locking means comprise: • an electric motor powered by a control device, • a rod driven by the motor, • an undercurrent blocker, ensuring the blocking of the rod, mounted in parallel with the electric motor and connected to the control device,
•un système de transmission assurant l'entraînement des moyens de déplacement du premier élément, à une vitesse déterminée.• a transmission system which drives the means for moving the first element, at a determined speed.
Avantageusement, le bloqueur à manque de courant est un frein qui bloque la tige lorsqu' il n'est pas alimenté électriquement et qui autorise un mouvement de la tige lorsqu'il est alimenté.Advantageously, the lack of current blocker is a brake which blocks the rod when it is not electrically supplied and which allows movement of the rod when it is supplied.
Selon l'invention, le système de transmission est un réducteur à pignons droits.According to the invention, the transmission system is a reduction gear with straight gears.
Selon un mode de réalisation de l'invention, le moteur est un moteur rotatif entraînant la tige dans un mouvement de rotation.According to one embodiment of the invention, the motor is a rotary motor driving the rod in a rotational movement.
Brève description des dessinsBrief description of the drawings
- la figure 1 représente schématiquement un fauteuil dont l'inclinaison du dossier est obtenue au moyen du système d'actionnement et de verrouillage de l'invention ; et- Figure 1 schematically shows an armchair whose backrest tilt is obtained by means of the actuation and locking system of the invention; and
- la figure 2 représente le schéma fonctionnel du système d'actionnement et de verrouillage de l'invention.- Figure 2 shows the block diagram of the actuation and locking system of the invention.
Description détaillée de modes de réalisation de 1 'inventionDetailed description of embodiments of the invention
La figure 1 représente un exemple de siège à dossier inclinable muni du système de modification et de conservation de l'inclinaison du dossier, conforme à 1 ' invention.FIG. 1 shows an example of a seat with a reclining backrest provided with the system for modifying and retaining the inclination of the backrest, according to the invention.
Aussi, pour une meilleure compréhension de l'invention, l'invention sera décrite dans son application à un siège à dossier inclinable. Il est à noter, toutefois, que le système de l'invention peut être mis en oeuvre pour un lit ou un siège dont un ou plusieurs éléments mobiles (tête-de-lit, garde-fou, système d'élévation, dossier, appui-tête, repose-jambes, appui-lombaires, etc.) peuvent changer de position.Also, for a better understanding of the invention, the invention will be described in its application to a seat with reclining back. It should be noted, however, that the system of the invention can be implemented for a bed or a seat including one or more mobile elements (headboard, railing, elevation system, backrest, support -head, legrest, lumbar support, etc.) can change position.
Le système de modification de position du dossier, montré sur la figure 1, comporte des moyens de déplacement 3 mécaniques du dossier 1 et des moyens d'actionnement et de verrouillage 4 destinés à actionner et/ou à bloquer ces moyens de déplacement 3.The backrest position modification system, shown in FIG. 1, comprises mechanical means 3 for moving the backrest 1 and actuation and locking means 4 intended to actuate and / or block these means of movement 3.
Autrement dit, ces moyens d'actionnement et de verrouillage, ou actionneur, répondent à une commande de l'utilisateur pour abaisser ou redresser le dossier 1 du siège par rapport à l'assise 2 de ce siège.In other words, these actuation and locking means, or actuator, respond to a command from the user to lower or straighten the seat back 1 relative to the seat 2 of this seat.
La figure 2 représente, de façon plus détaillée, un exemple d' actionneur de l'invention. Cet actionneur comporte un moteur électrique 5 sur lequel est fixée une tige de transmission 6 et dont le rôle est d'entraîner le mouvement de cette tige 6. Cette transmission peut être, par exemple, une rotation. Le moteur 5 est alimenté en énergie par un dispositif de commande 9. Ce dispositif de commande 9 reçoit une tension source Vs transmise au système par la diode CRI.FIG. 2 shows, in more detail, an example of an actuator of the invention. This actuator comprises an electric motor 5 on which is fixed a transmission rod 6 and whose role is to cause the movement of this rod 6. This transmission can be, for example, a rotation. The motor 5 is supplied with energy by a control device 9. This control device 9 receives a source voltage V s transmitted to the system by the diode CRI.
L' actionneur comprend, en outre, un bloqueur à manque de courant 7, alimenté en tension par le dispositif de commande 9. Le rôle de ce bloqueur est d'autoriser le mouvement de la tige 6 lorsqu'il est alimenté par le dispositif de commande 9 et, au contraire, d'interdire le mouvement de la tige 6 lorsqu'il n'est plus alimenté.The actuator further comprises a lack of current blocker 7, supplied with voltage by the control device 9. The role of this blocker is to authorize the movement of the rod 6 when it is supplied by the device command 9 and at on the contrary, to prohibit the movement of the rod 6 when it is no longer supplied.
Ce bloqueur à manque de courant 7 peut-être, par exemple, un frein à manque de courant ou un électro-aimant.This lack of current blocker 7 may be, for example, a lack of current brake or an electromagnet.
Selon l'invention, le moteur 5 et le bloqueur 7 sont montés en parallèle et sont alimentés par le même dispositif de commande 9.According to the invention, the motor 5 and the blocker 7 are mounted in parallel and are supplied by the same control device 9.
D'une part, le dispositif de commande 9 permet d'alimenter simultanément le moteur 5 et le bloqueur 7 par une tension de même valeur (qui peut-être, par exemple, de 24 volts) pour générer le mouvement. D'autre part, le dispositif autorise la coupure simultanée de l'alimentation du moteur 5 et de l'alimentation du bloqueur 7 pour bloquer le mouvement.On the one hand, the control device 9 makes it possible to simultaneously supply the motor 5 and the blocker 7 with a voltage of the same value (which may be, for example, 24 volts) to generate the movement. On the other hand, the device allows simultaneous cutting of the power supply to the motor 5 and the power supply to the blocker 7 to block the movement.
Un tel actionneur a une irréversibilité quasi-totale, ce qui signifie que l'irréversibilité de l' actionneur est supérieure à sa capacité dynamique.Such an actuator has almost total irreversibility, which means that the irreversibility of the actuator is greater than its dynamic capacity.
Le fonctionnement qui vient d'être décrit en ce qui concerne le moteur 5 et le bloqueur à manque de courant 7 est le même pour une cinématique à vide et une cinématique en charge entraînée.The operation which has just been described with regard to the motor 5 and the blocker for lack of current 7 is the same for a kinematics with no load and a kinematics with driven load.
Dans le cas d'une charge entraînante, c'est la relation entre l'énergie mécanique reçue et l'énergie électrique recueillie qui intervient. Par exemple, pour un moteur à courant continu, la tension présente à ses bornes est proportionnelle à sa vitesse de rotation.In the case of a driving load, it is the relation between the mechanical energy received and the electrical energy collected which intervenes. For example, for a DC motor, the voltage present at its terminals is proportional to its speed of rotation.
Le dispositif de commande 9 est commandé par la tension Vs. Il se comporte de façon à maintenir la tension moteur constante et à la même valeur que la tension Vs (quand le moteur devient générateur consécutivement à une charge entraînante ou à l'arrêt du moteur) .The control device 9 is controlled by the voltage V s . It behaves so as to keep the motor voltage constant and at the same value as the voltage V s (when the motor becomes generator following a driving load or stopping the engine).
Dans ce cas de charge entraînante, le dispositif de commande 9 agit dès lors que la tension de l' actionneur Va est supérieure à la tension source Vs. A ce moment, le transistor Ql (qui est, par exemple, un transistor bipolaire) devient « passant » de façon à écouler l'énergie en provenance du moteur devenu générateur ; le transistor Ql redevient « bloqué » naturellement quand la tension source Vs redevient supérieure à la tension de l' actionneur Va, donc quand le moteur n'est plus générateur.In this case of driving load, the control device 9 acts as soon as the voltage of the actuator V a is greater than the source voltage V s . At this time, the transistor Q1 (which is, for example, a bipolar transistor) becomes "on" so as to drain the energy coming from the motor become generator; the transistor Q1 naturally becomes “blocked” again when the source voltage V s becomes again greater than the voltage of the actuator V a , therefore when the motor is no longer generator.
On notera que la phase d'arrêt du moteur peut être un cas particulier de la charge entraînante ; en effet, la tension source Vs passe à environ 0 Volt, ce qui rend le transistor Ql passant dès l'instant et tant que Va est supérieure à Vs +0, 6 Volt, dans le cas du montage de la figure 2.It will be noted that the engine stopping phase may be a special case of the driving load; indeed, the source voltage V s goes to around 0 Volt, which makes the transistor Ql passing from the moment and as long as V a is greater than V s +0.6 Volt, in the case of the assembly of FIG. 2 .
Comme montré sur la figure 2, la tige 6 est reliée, à son extrémité, à un système de transmission 8 qui assure l'entraînement des moyens de déplacement mécaniques 3 du dossier 1.As shown in FIG. 2, the rod 6 is connected, at its end, to a transmission system 8 which drives the mechanical displacement means 3 of the backrest 1.
Selon un mode de réalisation de l'invention, ce système de transmission 8 est un réducteur à pignons droits qui a l'avantage d'offrir un rendement maximum et, par conséquent, une diminution de la consommation électrique, du volume et du poids du système d'actionnement par rapport aux systèmes à vis sans fin de l'art antérieur.According to one embodiment of the invention, this transmission system 8 is a reduction gear with straight pinions which has the advantage of offering maximum efficiency and, consequently, a reduction in the electrical consumption, the volume and the weight of the actuation system with respect to the worm screw systems of the prior art.
Cette association « bloqueur à manque de courant 7 et réducteur à pignons droits 8 » permet d'obtenir une bonne irréversibilité de l' actionneur tout en ayant un bon rendement de la transmission ; irréversibilité et rendement peuvent donc être modulés indépendamment l'un de l'autre.This association “blocker with lack of current 7 and reducer with straight pinions 8” makes it possible to obtain good irreversibility of the actuator. while having good transmission efficiency; irreversibility and yield can therefore be modulated independently of each other.
En outre, l'invention a l'avantage de permettre une forte diminution du courant d'alimentation à vide et de ses fluctuations par rapport au système à vis sans fin de l'art antérieur, du fait de la suppression des frottements importants dans les engrenages, variant en fonction de la température et des risques de grippage après un arrêt prolongé.In addition, the invention has the advantage of allowing a large reduction in the vacuum supply current and its fluctuations compared to the worm screw system of the prior art, due to the elimination of significant friction in the gears, varying depending on the temperature and the risk of seizure after a prolonged stop.
De plus, la relation entre l'énergie consommée et le couple délivré est optimisée et non-fluctuante dans le système de l'invention. En particulier, dans le cas d'un moteur à courant continu, la valeur du courant est une image fidèle de l'énergie mécanique transmise.In addition, the relationship between the energy consumed and the torque delivered is optimized and non-fluctuating in the system of the invention. In particular, in the case of a DC motor, the value of the current is a faithful image of the mechanical energy transmitted.
Selon un mode de réalisation de l'invention, le système comporte un dispositif mécanique 10, tel qu'un levier, qui permet d'inverser ou de conforter mécaniquement les deux états du bloqueur pour palier à un défaut éventuel du dispositif de commande 9 ou pour assurer l'obtention de positions de sécurité, par exemple, dans le cas de sièges passagers d'un avion, soumis aux règlements de l'Office Fédéral de l'Aéronautique FAA et de l'office des pays membres du JAA (autorités aéronautiques conjointes) qui exigent que ceux-ci soient en position droite lors du décollage et de l'atterrissage de l'avion. According to one embodiment of the invention, the system comprises a mechanical device 10, such as a lever, which makes it possible to reverse or mechanically reinforce the two states of the blocker to compensate for a possible defect in the control device 9 or to obtain safety positions, for example, in the case of passenger seats of an aircraft, subject to the regulations of the Federal Office of Aeronautics FAA and the office of member countries of the JAA (aeronautical authorities which require that they be in an upright position during takeoff and landing of the aircraft.

Claims

REVENDICATIONS
1. Système de modification de la position des éléments mobiles d'un lit ou d'un siège comportant : «des moyens (3) de déplacement mécaniques d'un premier élément mobile par rapport à un second élément fixe ou mobile du lit ou du siège,1. System for modifying the position of the mobile elements of a bed or of a seat comprising: “means (3) for mechanical displacement of a first mobile element with respect to a second fixed or mobile element of the bed or of the seat,
•des moyens d'actionnement (4) fixés sur le siège ou le lit pour activer ou bloquer lesdits moyens de déplacement du premier élément, caractérisé en ce que les moyens d'actionnement comprennent :• actuation means (4) fixed on the seat or the bed for activating or blocking said means for moving the first element, characterized in that the actuation means comprise:
•un moteur électrique (5) alimenté par un dispositif de commande ( 9) , «une tige (6) entraînée par le moteur,An electric motor (5) supplied by a control device (9), “a rod (6) driven by the motor,
•un bloqueur à manque de courant (7), assurant le blocage de la tige, monté en parallèle avec le moteur électrique et relié au dispositif de commande (9),• an undercurrent blocker (7), ensuring the blocking of the rod, mounted in parallel with the electric motor and connected to the control device (9),
•un système de transmission (8) assurant l'entraînement des moyens de déplacement du premier élément, à une vitesse déterminée.• a transmission system (8) which drives the means for moving the first element at a determined speed.
2. Système selon la revendication 1, caractérisé en ce que le bloqueur à manque de courant est un frein qui bloque la tige (6) lorsqu'il n'est pas alimenté électriquement et qui autorise un mouvement de la tige lorsqu'il est alimenté.2. System according to claim 1, characterized in that the lack of current blocker is a brake which blocks the rod (6) when it is not electrically supplied and which allows movement of the rod when it is supplied .
3. Système selon la revendication 1 ou 2, caractérisé en ce que le système de transmission (8) est un réducteur à pignons droits. 3. System according to claim 1 or 2, characterized in that the transmission system (8) is a reduction gear with straight gears.
4. Système selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le moteur est un moteur rotatif entraînant la tige (6) dans un mouvement de rotation. 4. System according to any one of claims 1 to 3, characterized in that the motor is a rotary motor driving the rod (6) in a rotational movement.
EP99911854A 1998-04-02 1999-04-01 Actuating and locking system for positioning a bed or seat mobile elements Expired - Lifetime EP1066169B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9804111A FR2776903B1 (en) 1998-04-02 1998-04-02 ACTUATION AND LOCKING SYSTEM FOR POSITIONING MOVABLE ELEMENTS OF A BED OR SEAT
FR9804111 1998-04-02
PCT/FR1999/000759 WO1999051126A2 (en) 1998-04-02 1999-04-01 Actuating and locking system for positioning a bed or seat mobile elements

Publications (2)

Publication Number Publication Date
EP1066169A2 true EP1066169A2 (en) 2001-01-10
EP1066169B1 EP1066169B1 (en) 2003-07-02

Family

ID=9524785

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99911854A Expired - Lifetime EP1066169B1 (en) 1998-04-02 1999-04-01 Actuating and locking system for positioning a bed or seat mobile elements

Country Status (10)

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US (1) US6623077B1 (en)
EP (1) EP1066169B1 (en)
JP (1) JP2002510513A (en)
BR (1) BR9909305A (en)
CA (1) CA2327390C (en)
DE (1) DE69909270T2 (en)
ES (1) ES2203094T3 (en)
FR (1) FR2776903B1 (en)
TW (1) TW401362B (en)
WO (1) WO1999051126A2 (en)

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Also Published As

Publication number Publication date
EP1066169B1 (en) 2003-07-02
CA2327390A1 (en) 1999-10-14
FR2776903A1 (en) 1999-10-08
ES2203094T3 (en) 2004-04-01
WO1999051126A3 (en) 1999-12-09
TW401362B (en) 2000-08-11
WO1999051126A2 (en) 1999-10-14
US6623077B1 (en) 2003-09-23
BR9909305A (en) 2000-11-21
DE69909270D1 (en) 2003-08-07
DE69909270T2 (en) 2004-05-27
JP2002510513A (en) 2002-04-09
FR2776903B1 (en) 2000-06-16
CA2327390C (en) 2007-06-19

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