EP0391759B1 - Dispositif de réglage de la tension d'une nappe d'appui d'un coussin de siège - Google Patents

Dispositif de réglage de la tension d'une nappe d'appui d'un coussin de siège Download PDF

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Publication number
EP0391759B1
EP0391759B1 EP19900400752 EP90400752A EP0391759B1 EP 0391759 B1 EP0391759 B1 EP 0391759B1 EP 19900400752 EP19900400752 EP 19900400752 EP 90400752 A EP90400752 A EP 90400752A EP 0391759 B1 EP0391759 B1 EP 0391759B1
Authority
EP
European Patent Office
Prior art keywords
tension
shape memory
layer
arrangement according
memory material
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
EP19900400752
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0391759A1 (fr
Inventor
Fereydoun Garajedagui
Antonio Moretti
Bernard Favre
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.)
Regie Nationale des Usines Renault
Original Assignee
Regie Nationale des Usines Renault
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 Regie Nationale des Usines Renault filed Critical Regie Nationale des Usines Renault
Publication of EP0391759A1 publication Critical patent/EP0391759A1/fr
Application granted granted Critical
Publication of EP0391759B1 publication Critical patent/EP0391759B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/28—Seat parts with tensioned springs, e.g. of flat type
    • A47C7/30—Seat parts with tensioned springs, e.g. of flat type with springs meandering in a flat plane

Definitions

  • the invention relates to a device for adjusting the tension of a support ply of a seat cushion, constituted by a spring ply with adjustable tension disposed between two opposite elements of a frame.
  • the publication FR-A 2 060 877 describes a seat in which the mutual distance of the two opposite elements is mechanically adjustable so as to modify the tension of the spring ply.
  • the publication FR-A 2 447 168 describes a bearing surface of a seat, constituted by springs of metal wire having undulations in the plane of the surface fixed by one end to a frame element of the seat and whose l the other end is attached to maneuverable adjustment members to modify the curvature of said corrugated wires.
  • the subject of the invention is an adjustment device applying a shape memory alloy whose arrangement makes it possible to vary the tension of the seat suspension ply.
  • the invention also relates to such a device in which the passage of a current through the shape memory material results in a deformation of the latter capable of varying the preload of the suspension ply.
  • the spring ply is joined to one of the elements of the frame by a shape memory material in order to obtain an increase in tension when it is brought by heating to a certain temperature, in association with a blocking device for the purpose of retaining said increase in voltage when said heating is suppressed.
  • FIG. 1 relates to the properties of an alloy wire (Ni - Ti) with shape memory.
  • This material deformed at low temperature returns to its initial shape when its temperature rises above a threshold called transformation temperature.
  • a wire or a spring made of a shape memory alloy which has undergone an elongation regains its initial length when it is brought to a temperature higher than the transformation temperature.
  • Curve A describes the variation of the stress ⁇ in N / mm2 as a function of the elongation ⁇ in% at low temperature (martensitic phase).
  • Curve B describes the variation of the stress as a function of the elongation beyond the transformation temperature (austenitic phase).
  • FIG. 2 schematically represents a seat frame defined by a structure 1 mounted on runners 2 designed to be fixed to the vehicle.
  • the structure has opposite transverse elements 3, 4 constituting the frame 5 supporting a sheet of springs 6 joined to the front element 3.
  • the springs 6 respectively constituted by wavy wires are mounted in tension using springs of suspension 7 on the structure.
  • the suspension springs 7 are joined for example to the element 3 by a shape memory element 10 which can be constituted by a wire or by a spring.
  • one or more springs such as 7 (fig. 5, 6) are coupled to a traction cable 11 wound one or more times to prevent sliding on a pulley 12 of a locking device 13 whose axis 22 carries a toothed wheel 23 capable of being immobilized by an element or pawl 24.
  • the pawl 24 is a spring pawl 25 on which an electromagnetic control 26 acts for example and the end of the cable 11 is joined to the element 3 of the seat by the shape memory material 10.
  • the cable 11 can also rest on the pulley 12 and slide in a blocking device known per se, for example, by the publication FR-A 2 589 206 which is immobilized on the structure 1 of the seat .
  • the device 13 can also be a locking member actuated, for example, by an axial biasing spring itself constituted by a shape memory material whose heating, by an electric current, allows the unlocking of the device, and consequently a traction of the cable 11 under the effect of the modification of the length of the material 10.
  • the spring made of shaped alloy material replaces the electromagnet 26.
  • FIG. 3 also shows the pulse contact 14 which allows the heating of the material 10.
  • the cable 11 carries an adjustable stop 17 capable of coming to bear on a seat element whose position is adjusted according to the maximum elongation characteristics of the material with memory (8% for an Ni - Ti alloy).
  • blocking device 13 by any equivalent device produced for example from cable clamps with electromechanical control of an electromagnet, or of an actuator using the properties of shape memory alloys.
  • the element 10 can also be formed from other alloys such as the Al - Cu - Zn or Al - Cu - Ni alloys.
  • the springs such as 7 may be grouped or connected together and be actuated by a single or two control assemblies including the cable 10 and the device 13 as has been shown in FIGS. 5 and 6.
  • the Ni - Ti alloy makes it possible to obtain a relatively large force for a given section of wire.
  • its electrical resistivity being important, the heating can be obtained by a current of a few amps.
  • the transition temperature cannot exceed 100 ° C for this same alloy, the response of the element can be relatively slow during its cooling. In fact, the longer the cooling time, the smaller the difference between the temperature of the alloy and the ambient temperature.

Landscapes

  • Seats For Vehicles (AREA)
  • Springs (AREA)
EP19900400752 1989-04-04 1990-03-20 Dispositif de réglage de la tension d'une nappe d'appui d'un coussin de siège Expired - Lifetime EP0391759B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904397 1989-04-04
FR8904397A FR2644996B1 (fr) 1989-04-04 1989-04-04 Dispositif de reglage de la tension d'une nappe d'appui d'un coussin de siege

Publications (2)

Publication Number Publication Date
EP0391759A1 EP0391759A1 (fr) 1990-10-10
EP0391759B1 true EP0391759B1 (fr) 1993-02-24

Family

ID=9380355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900400752 Expired - Lifetime EP0391759B1 (fr) 1989-04-04 1990-03-20 Dispositif de réglage de la tension d'une nappe d'appui d'un coussin de siège

Country Status (4)

Country Link
EP (1) EP0391759B1 (es)
DE (1) DE69000948T2 (es)
ES (1) ES2038042T3 (es)
FR (1) FR2644996B1 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2341087B (en) * 1998-09-01 2000-09-13 Youngflex Ag Suspension assembly
NL1028539C2 (nl) * 2005-03-14 2006-09-18 Hans Voorwinde Beheer B V Inrichting voor het voorkomen van decubitus.
DE102014015284B4 (de) * 2014-10-16 2018-01-18 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Kissen zur aktiven Umlagerung eines menschlichen Kopfes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE199303C (es) *
DE377369C (de) * 1921-08-23 1923-06-19 August Leder In der Laenge und Breite verstellbare Eisenbettstelle
US2893475A (en) * 1955-04-05 1959-07-07 Chrysler Corp Variable rate spring suspension
FR2087510A5 (es) * 1970-05-21 1971-12-31 Citroen Sa
AU557891B2 (en) * 1983-10-18 1987-01-15 Tachikawa Spring Co. Ltd. Lumbar support device

Also Published As

Publication number Publication date
DE69000948D1 (de) 1993-04-01
EP0391759A1 (fr) 1990-10-10
DE69000948T2 (de) 1993-07-29
FR2644996B1 (fr) 1991-06-07
ES2038042T3 (es) 1993-07-01
FR2644996A1 (fr) 1990-10-05

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