WO1995017117A1 - Dispositif d'inclinaison pour chaise - Google Patents

Dispositif d'inclinaison pour chaise Download PDF

Info

Publication number
WO1995017117A1
WO1995017117A1 PCT/NO1994/000210 NO9400210W WO9517117A1 WO 1995017117 A1 WO1995017117 A1 WO 1995017117A1 NO 9400210 W NO9400210 W NO 9400210W WO 9517117 A1 WO9517117 A1 WO 9517117A1
Authority
WO
WIPO (PCT)
Prior art keywords
component
torsion rod
rod unit
chair
lever
Prior art date
Application number
PCT/NO1994/000210
Other languages
English (en)
Inventor
Jurek Buchacz
Original Assignee
Jurek Buchacz
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 Jurek Buchacz filed Critical Jurek Buchacz
Priority to AU13930/95A priority Critical patent/AU1393095A/en
Publication of WO1995017117A1 publication Critical patent/WO1995017117A1/fr

Links

Classifications

    • 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
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • 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
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03277—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs
    • A47C1/03279—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs of torsion type
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
    • A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting chairs
    • 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
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/445—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs
    • A47C7/4454—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs of torsion type

Definitions

  • the present invention relates to a tilting mount device for a chair which provides a synchronous tilting movement of the chair seat and back, wherein the tilting mount has a first component which is rigidly connected to the chair support, and a second component which is connected to the chair seat and the back support, and where a torsion rod unit is provided at a front part of said first component.
  • a device of this kind is known inter alia from International Publication No. WO 92/03072 (PCT/NO90/00134) .
  • the attached Figure 14 illustrates the principle of such a device. What is characteristic for this asymmetrical solution is that the fulcrum of the tilting mount 28 in relation to the torsion rod unit 29 is approximately coaxial with the torsion rod unit.
  • a solution of this kind is cumbersome and expensive as it requires double the amount of tubing and a double set of linings.
  • a common dimension of a torsion rod used in chairs is usually a length of 400 mm and a cross-section of 10 x 10 mm. There is attached to one end of the torsion rod unit (on the right in Fig.
  • a substantially tubular mounting 30 which, with lugs 31, 32, forms a connection with the seat and/or back of the chair.
  • the tilting mount 28 is fixed to the chair support, e.g., via a supporting column which projects upwards from the chair base cross.
  • the reference numeral 33 indicates the axis of rotation of the back/seat.
  • the torsion rod unit 34 is located in the centre above the chair support (a supporting column connected to a base cross) .
  • the fulcrum of the tilting mount 35 in relation to the chair support is also coaxial with the torsion rod.
  • the torsion rod in the illustrated embodiment will be about 400 mm in length, i.e., effectively twice 200 mm, and will have a cross-section of 10 x 10 mm.
  • a substantially tubular mounting 36 forms a connection with respective ends 34' and 34'' of the torsion rod 34 and, via lugs 37, 38, is connected to the chair seat and/or back.
  • the axis of rotation of the seat and the back is indicated by the reference numeral 39.
  • the tilting mount 35 is connected to the chair support. Owing to the fact that the effective length of the torsion rod is in reality only about 200 mm (on either side of the mount 35) , the torsional rigidity will be great, and the device allows at most a tilt of about 6-7°. In reality, this solution exhibits a symmetrical construction which in practice does not work.
  • French Patent Publication No. 2594663 describes inter alia a technical solution for a tilting mechanism for the seat and back of a chair, where in one of the embodiments two torsion rods, separated in the longitudinal direction of the chair, but interactive, are used for the seat and back respectively, and in a second embodiment a pneumatic spring is used.
  • the back edge of the seat is incrementally connectible with the angle lever which supports the back support.
  • the present invention thus aims to provide a device where a tilting of the seat and the back support is made possible, and where the springs are of a more even and pliant nature than those which are previously known, thereby obtaining a controlled balancing of the displacement of the centre of gravity of the chair user's body.
  • the device is characterised according to the invention in that said first and second components form a rotatable connection with each other at a first distance behind said torsion rod unit, and that the torsion rod unit has a tube which is rigidly connected to said first component for non-moveable mounting of the torsion rod of the torsion rod unit in each end of the tube, and is provided with a lever means preferably consisting of a second and third lever which is designed to actuate the torsion rod during the movement of the second component in relation to the first component, said lever means having a first end secured to the torsion rod of the torsion rod unit and a second end which forms an articulation with a front end of said second component, said second end being located at a second distance from the torsion rod unit and said front end being at a third distance from said rotatable connection, and said second and third distances forming said first distance.
  • Said second and third distances advantageously form a reciprocal ratio in the range 3:1-2:1.
  • the front edge of the seat is rotatably mounted on the periphery of the torsion rod unit.
  • the back edge of the seat may be connected to said second component of the tilting mount via an adjustable mechanism.
  • the aforementioned torsion rod unit may comprise moreover a first lever for actuating initial tension of the torsion rod relative to the tube, said lever being disposed in engagement with a central part of the torsion rod, and the free end of the lever being capable of being actuated via an adjustment mechanism which is in threaded engagement with said first component of the tilting mount.
  • lever means has second and third levers, these are disposed adjacent said first lever on respective sides thereof.
  • Figure 1 illustrates a first embodiment of the device, according to the invention, seen in perspective in a first position of the tilting mount.
  • Figure 2 shows the device of Figure 1 seen in a second position of the tilting mount.
  • Figure 3 is a side view of the device according to Figures 1 and 2, with the tilting mount in the position shown in Figure 1 and with the seat and back support bracket mounted.
  • Figure 4 illustrates the device in Figure 3 seen from the underside.
  • Figure 5 shows a second embodiment of the device in Figures 1 and 2, seen partially in section.
  • Figure 6 shows the device in Figure 5 seen from above and partially in section.
  • Figure 7 shows in a somewhat simplified form the principle of the mode of operation of the present invention.
  • Figure 8 shows the embodiment of Figure 7 in a second tilting position.
  • Figure 9 shows a simplified embodiment of the device, according to the invention.
  • Figure 10 shows the embodiment in Figure 9 in a second tilting position.
  • FIG 11 shows a more practical embodiment of the device, according to the invention, as schematically illustrated in Figures 9 and 10.
  • FIGS 12 and 13 illustrate the basic principle of the invention.
  • Figures 14 and 15 show, as prior art, two different solutions according to WO92/03072 and US Patent 3402964 respectively.
  • the tilting mount 1 has a first component 2 which is rigidly connected to the chair support 3 via a coupling piece 4 on the first component 2. Furthermore, the tilting mount 1 has a second component 5, where the rear part 5' of this second component will form a connection with the chair seat and back support (not shown in Figures 1 and 2) , as can be seen in Figures 3 and 4, where the chair seat is indicated by means of the reference numeral 6 and the mounting bracket for the chair back is designated by means of the reference numeral 7.
  • the first component 2 and the second component 5 are rotatably connected to one another via a rotary shaft 8.
  • a torsion rod unit 9 is provided at a front part of the first component 2.
  • the rotary shaft 8 has a first distance Dl to the torsion rod unit and a fourth distance D4 to the connection with the chair support.
  • the torsion rod unit 9 is provided with a lever means 18, 19 which has a first end fixed to the torsion rod 15 of the torsion rod unit and a second end 20 which forms an articulation 21 with a front end 22 of said second component.
  • Said second end and said front end consist of contact chocks which form a fixed engagement with said lever means 18, 19 and the front part of said second component 5 respectively.
  • the articulation 21 may be a circular bar rotatably mounted in the front part of said second component 5.
  • the connection 21 thus forms a simple roller bearing between the two chocks 20, 22 so that minimal friction occurs during the tilting movement.
  • the chocks 22 may optionally be omitted.
  • the said second end 20 (and the articulation 21) is located at a second distance D2 from the torsion rod unit 9 and said front end 22 (and articulation 21) are at a third distance D3 from said rotatable connection.
  • the levers 18, 19 (of which only lever 19 is drawn in on Figure 5) are designed such that they form an engagement with the contact chock 20 which in turn forms contact with the bar 21 which extends between opposite sides of the front part of the second component 5.
  • the chock 22 may optionally have the same cross-sectional form (e.g., a square cross-section) as the chock 20.
  • Figures 5 and 6 represent a minor modification of the solution in Figures 1 to 4, said second component lying on the outside of the first component, in contrast to the solution in Figures 1 to 4 where the second component 5 lies inside the first component 2. This is merely a detail of design which is of no particular significance for the mode of operation of the device according to the invention.
  • said second distance D2 and third distance D3 form a reciprocal ratio in the range of 3:1-2:1.
  • the ratio is preferably 2:1.
  • the front part of the seat is rotatably mounted on the torsion rod unit, for example, by means of snap-on rotary connections 10.
  • stoppers 11 and 12 which limit such sideways movement can be provided on the torsion rod unit.
  • the back edge of the seat 6 may be provided with a connecting mechanism 13, preferably of the adjustable type.
  • a pneumatic spring corresponding to the type that it indicated by means of the reference numeral 3.
  • the pneumatic spring 3 forms a part of the chair support, a base cross, for instance, forming the chair's contact with the underlying surface and which for the sake of simplicity has not been included in the figures.
  • a first lever 16 which serves adjustably to give the torsion rod 15 an initial tension in relation to the tube 14.
  • An adjusting screw 17 which is rotatably connected to the component 2 causes this adjustability.
  • the torsion rod 15 will be 40 cm in length and have a cross-section of 10 x 10 mm, the torsion rod normally being square in cross-section.
  • the back part 5' of the second component 5 is provided with a pocket 23 for receiving the lower end of the back support bracket 7.
  • An opening 23' is provided for mounting optional tightening equipment for the back support bracket 7.
  • the torsion rod 15 is fixed at both ends of the tube 14 by means of fixing chocks 24.
  • the tube 14 is made in two portions 14' and 14'' rigidly connected to one another by means of a strong connecting piece 25. This connecting piece is preferably welded to the two tube portions.
  • a stabilizing lining 26 is provided in the end of the tube portion which is closest to the centre of the torsion rod unit.
  • the lever 16 is provided with projections 16' , with which the respective second and third levers 18, 19 form a non-rotatable engagement, such that when the levers 18, 19 together rotate, the lever 16 will also rotate together therewith, the lever 16 causing the necessary initial tension of the torsion rod 15.
  • FIGS 7 and 8 illustrate a simplified form of the emdodiment of the invention that is made apparent in the preceding Figures 1 to 6.
  • the second component 5 of the tilting mount will tilt on the rotary shaft 8 at an angle alpha, whilst the levers 18 and 19 cause the torsion rod to rotate through an angle beta, where beta preferably has a value which is 1/3 - 1/2 of the value of the angle alpha.
  • the seat 6 will also tilt backwards at an angle approximately equal to beta.
  • the angle alpha is 20° whilst the angle beta is 7-10°.
  • Figures 9 to 11 show a modification of the embodiment illustrated in Figures 1 to 8.
  • the embodiment in Figures 9 to 11 shows the seat and the back in one piece, designated by the reference numeral 27, and that the front part of the seat is not rotatably mounted on the torsion rod unit 9 by means of snap- on rotary connections 10, but that the combination 27 of the seat and back is only mounted to the first component 2 of the tilting mount via the rotary shaft 8 and a second component 28 which has a function which essentially corresponds to that which is shown and described for the component 5 in Figures
  • the torsion rod unit 9 is provided with the said levers 18, 19, which, in a previously illustrated way, have a first end thereof fixed to the torsion rod 15 of the torsion rod unit and a second end 20 which forms an articulation 21 with a front end 22 of said second component 28.
  • the second end 20 is located at a second distance D2 from the torsion rod unit 9 and the front end 22 of said second component 28 is at a third distance D3 from the rotatable connection 8.
  • the levers 18; 19 will tilt at a maximum of 10°, whilst the second component 5; 28 will turn through an angle of 20 as a result of the transmission that is present.
  • angles alpha and beta which are drawn in on Figure 10, are equivalent to the angle values alpha and beta which can be seen in Figure 8.
  • the combination 27 of the seat and the back in the illustrated example will tilt at an angle of alpha instead of at approximately the angle beta.
  • the actual seat plate has been designated by means of the reference numeral 27' and the bracket which connects the seat 27' to the component 28 and the back support (not shown) is designated by means of the reference numeral 27' ' .

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)

Abstract

L'invention concerne un dispositif d'inclinaison pour chaise, avec lequel il est possible d'effectuer, de façon synchronisée, un mouvement d'inclinaison du siège et un mouvement d'inclinaison du dossier. Ledit dispositif (1) comprend un premier élément (2) qui est relié, de façon rigide, au support (3) de la chaise, et un deuxième élément (5) qui est relié au siège (6) de la chaise et au support (7) du dossier. Une unité (9) à barre de torsion est montée sur la partie avant du premier élément (2). Le premier élément (2) et le second élément (5) sont articulés l'un par rapport à l'autre (8), à une deuxième distance (D2) derrière ladite unité (9) à barre de torsion, et à une troisième distance (D3) depuis une liaison rotative (8) entre ledit premier élément (2) et ledit second élément (5).
PCT/NO1994/000210 1993-12-23 1994-12-22 Dispositif d'inclinaison pour chaise WO1995017117A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU13930/95A AU1393095A (en) 1993-12-23 1994-12-22 Improvement in a tilting means for a chair

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO934790A NO934790L (no) 1993-12-23 1993-12-23 Anordning ved vippebeslag for en stol
NO934790 1993-12-23

Publications (1)

Publication Number Publication Date
WO1995017117A1 true WO1995017117A1 (fr) 1995-06-29

Family

ID=19896721

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1994/000210 WO1995017117A1 (fr) 1993-12-23 1994-12-22 Dispositif d'inclinaison pour chaise

Country Status (3)

Country Link
AU (1) AU1393095A (fr)
NO (1) NO934790L (fr)
WO (1) WO1995017117A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1066775A1 (fr) * 1999-07-06 2001-01-10 Röder, Peter Chaise
JP2018171506A (ja) * 2012-09-20 2018-11-08 スティールケース インコーポレイテッド 椅子アセンブリ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2594663A1 (fr) * 1986-02-21 1987-08-28 Cofemo Spa Chaise ou fauteuil a inclinaison variable et synchronisee de l'assise et du dossier
WO1992003951A1 (fr) * 1990-09-05 1992-03-19 Stål & Stil A/S Siege de travail

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2594663A1 (fr) * 1986-02-21 1987-08-28 Cofemo Spa Chaise ou fauteuil a inclinaison variable et synchronisee de l'assise et du dossier
WO1992003951A1 (fr) * 1990-09-05 1992-03-19 Stål & Stil A/S Siege de travail

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1066775A1 (fr) * 1999-07-06 2001-01-10 Röder, Peter Chaise
JP2018171506A (ja) * 2012-09-20 2018-11-08 スティールケース インコーポレイテッド 椅子アセンブリ

Also Published As

Publication number Publication date
NO934790D0 (no) 1993-12-23
AU1393095A (en) 1995-07-10
NO934790L (no) 1995-06-26

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