WO2017212361A1 - Système d'articulation pour chaises - Google Patents

Système d'articulation pour chaises Download PDF

Info

Publication number
WO2017212361A1
WO2017212361A1 PCT/IB2017/053030 IB2017053030W WO2017212361A1 WO 2017212361 A1 WO2017212361 A1 WO 2017212361A1 IB 2017053030 W IB2017053030 W IB 2017053030W WO 2017212361 A1 WO2017212361 A1 WO 2017212361A1
Authority
WO
WIPO (PCT)
Prior art keywords
support
seat
articulation
hinge point
backrest
Prior art date
Application number
PCT/IB2017/053030
Other languages
English (en)
Inventor
Sergio Moreschi
Original Assignee
Co.Fe.Mo. Industrie S.R.L.
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 Co.Fe.Mo. Industrie S.R.L. filed Critical Co.Fe.Mo. Industrie S.R.L.
Priority to BR112018075328A priority Critical patent/BR112018075328A2/pt
Priority to EP17733891.0A priority patent/EP3468416B1/fr
Priority to EP21175106.0A priority patent/EP3903642B1/fr
Publication of WO2017212361A1 publication Critical patent/WO2017212361A1/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
    • 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
    • A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers

Definitions

  • the present invention refers to an articulation system for chairs, particularly of the type in which the movements of the seat and backrest are synchronized with respect to each other.
  • prior-art chairs particularly office chairs, which comprise an articulation system comprising a main frame constrained to a base for resting the chair on the ground, a support for the seat and a support for the backrest of the chair.
  • the support for the seat and the support for the backrest are both articulated with respect to the frame and, owing to an articulation mechanism that connects them, they are articulated with respect to each other so that a movement of one corresponds to a predetermined movement of the other (this articulation mechanism is defined as "synchronized" in the technical jargon of this field).
  • the articulation mechanism connecting the two supports is adjustable so that the relation between the two movements can be changed.
  • WO 2009/15381 1 A1 discloses an adjustment device for chairs, comprising a main body, which can be engaged onto a supporting shank of a chair; a prop element mounted on the main body; a backrest mounted onto the main body; and articulation means for movably engaging the backrest and the seat support to the main body, the articulation means comprising a lever pivoting around the main body and hinged to the prop element and to the backrest so as to obtain a given relation of movement between the backrest and the prop element.
  • WO 2010/097818 A1 discloses a device for synchronizing the inclination of the backrest and seat of a chair, of the type comprising a frame for the backrest, a frame for the seat and a support integral with the base of the chair, as well as a first crank integral with the frame for the backrest and hinged to the rear part of the frame for the seat and to the support, and a second crank hinged to the front part of the frame for the seat and to the support, so as to form, together with the frame for the seat, an articulated quadrilateral.
  • the Applicant has found that the prior-art articulation systems for chairs have several drawbacks and/or that several aspects thereof can be improved.
  • the Applicant has noted that because of their structures being based on levers or cranks pivoted to the main frame, the articulation systems of WO 2009/153811 A1 and WO 2010/097818 A1 determine a rotational-translational movement of the seat in which the vertical and horizontal components of the translational motion of the front part of the seat are rigidly determined.
  • the Applicant has observed that the front hinge point of the seat completes an arc of a circle with the centre facing the rear part of the system, and this, given a certain relation between the vertical component and the horizontal component of the translational motion of the front part of the seat in the initial tract of the movement, determines a modification of this relation in the course of the movement, becoming increasingly imbalanced in favour of the horizontal component to the disadvantage of the vertical component.
  • the elevation rate of the front part of the seat as a function of the rotation of the backrest proves to gradually decrease upon an increase in the degree of inclination of the backrest with respect to the at-rest position.
  • this pattern brings about a response to the inclination perceived by the user that is not always optimal for the entire course of travel for the inclination, and/or it brings about limitations in the measure of the inclination of the backrest and/or chair.
  • An aim of the present invention is to develop an articulation system for chairs which resolves one or more of the issues described above.
  • the invention refers to an articulation system for chairs, the system comprising:
  • main frame designed to be associated with a base for a chair
  • the present invention concerns a chair comprising the articulation system in accordance with the first aspect.
  • front and rear refer to normal use of a chair that incorporates the present invention, in which the user's legs are at the front side of the system.
  • the systems for synchronized articulation of a backrest and seat disclosed in WO 2009/153811 A1 and WO 2010/097818 A1 which utilize rods for articulating the seat and main body, are such that the front hinge point of the seat is forced to travel, in the reference plane, a path in the form of an arc of a circle with the concavity facing the axis of rotation of the rear articulation rod.
  • This movement of the front hinge point constitutes a mechanical constraint that creates an upper dead centre of the path of the hinge point, in which the latter moves almost horizontally, and/or predetermined dynamics of variations in the relation between the vertical and horizontal component of the translational motion of the front part of the seat.
  • This brings about functional limits in the overall articulation system, for example of the type described hereinabove.
  • the present solution produces a movement of the front part of the seat without any upper dead centres.
  • the measure of the range of inclination and/or the maximum degree of inclination that can be reached by the backrest can be increased.
  • the present solution also makes it possible to maintain a desired elevation rate for the front part of seat as a function of the rotation of the articulation element, for the entire course of travel for the rotation of the latter.
  • the relation between the horizontal and vertical components develops in an opposite manner compared to the development obtained in the case of articulation with a front lever or crank (that is, in the form of an arc of a circle with the concavity facing rearwards.
  • this elevation rate can increase upon an increase in the rotation of the articulation element.
  • the above-mentioned characteristics determine a different resolution of the elastic reaction force acting upon the second hinge point of the seat, with effects that are advantageous in terms of the response of the articulation system to inclination as a function of the degree of inclination and/or the user's weight.
  • the present invention can have one or more of the following preferred characteristics, some of which refer to the above- mentioned reference plane.
  • Said path section typically coincides with the entire path possible for said second hinge point.
  • said rectilinear section is inclined with respect to a horizontal direction so that one rotation of the articulation element away from a front portion of the articulation system corresponds to an elevation of the second hinge point.
  • said weight force of the user opposes inclination in a manner proportional to the weight itself.
  • said rectilinear path section forms an acute angle with the horizontal direction, said acute angle being located above said horizontal direction and facing rearwards. In this manner, an advantageous spatial orientation of the path section is achieved.
  • Said acute angle is preferably greater than or equal to 5°, more preferably greater than or equal to 10°.
  • Said acute angle is preferably less than or equal to 40°, more preferably less than or equal to 30°.
  • one rotation of the first hinge point corresponds to an optimal elevation of the second hinge point.
  • said rectilinear path section is horizontal.
  • said curvilinear path section extends along (or approximates) an arc of a circle having a centre, wherein a horizontal line passing through said centre remains above the path section and a vertical line passing through the centre remains in front of the path section.
  • Said arc of a circle preferably has a radius greater than or equal to 50mm, more preferably greater than or equal to 60mm, and/or less than or equal to 200mm, preferably less than or equal to 150mm.
  • the Applicant has found that these characteristics of the curvilinear section give the second hinge point advantageous movement properties. For example, the rate of elevation of the second hinge point tends to increase in the upper portion of the path (corresponding to more accentuated inclinations of the backrest), to the disadvantage of the horizontal translation component of the second hinge point.
  • the first hinge point is preferably located in a rear portion of the support for the seat. The structure thus proves to be compact.
  • the system is preferably configured to assume an at-rest configuration in the absence of tilting forces acting upon the support for the seat and/or backrest.
  • this at-rest configuration when the seat is fixed on the support for the seat, the seat is typically arranged horizontally and when the backrest is fixed to the support for the backrest, the backrest is substantially vertical.
  • the system is preferably configured to assume a maximum inclination configuration, in which the support for the seat and the support for the backrest assume the maximum inclination possible with respect to the at-rest position.
  • Said guide typically has a lower end, which typically has a lower abutment surface, and an upper end, which typically has an upper abutment surface, wherein in the at-rest configuration and in the maximum inclination configuration, the slider is found at the lower and upper end of the guide, respectively, preferably abutting against said lower and/or upper abutment surface, respectively.
  • the guide thus also acts as a stopping point.
  • the first hinge point in said at-rest configuration, is found, with reference to said reference plane, interposed between a line vertical to said axis of rotation and a line vertical to the second hinge point, and preferably above a line horizontal to the axis of rotation.
  • the articulation system opposes a reaction to the inclination proportional to the weight of the user on the seat (called “self- weighing” in the jargon of this field).
  • the first hinge point when the user exerts pressure (typically on the backrest), which tends to make the seat tilt by rotational-translational movement of the seat starting from the at-rest configuration, the first hinge point must necessarily rise, thereby overcoming a component of the weight of the user.
  • the first hinge point is found, with reference to said reference plane, on the opposite side of a line vertical to said axis of rotation with respect to the second hinge point, and preferably above a line horizontal to the axis of rotation.
  • the weight force of the user contributes to the tilting process, although the concomitant rearward movement of the seat opposes this tilting process, owing to the presence of the forces of friction between the user and the seat.
  • the support for the backrest is solidly constrained to said articulation element.
  • the articulation element can form one whole element with at least one part of said support for the backrest or the support for the backrest can be rigidly fixed to the articulation element. In this manner, the system in its entirety proves to be simple in construction, reliable and economical in terms of production.
  • the support for the backrest is connected to the articulation element in an articulated manner. In this manner, additional degrees of freedom are introduced between the backrest and the seat, leading to improved ergonomics and/or versatility and/or comfort of the chair.
  • the articulation system preferably comprises an additional articulation element that is rigid and hinged to said main frame so that it can rotate about an additional axis of rotation, wherein said support for the backrest is hinged to said articulation element on a side of the articulation element that is opposite said first hinge point of the seat with respect to said axis of rotation, and it is also hinged to said additional articulation element.
  • the articulation system preferably comprises at least one elastic element that is operatively interposed between said main frame and said support for the seat. In this manner, the elastic reaction force developed by the elastic element opposes inclination of the seat with respect to an at-rest state, typically in a more pronounced manner the more accentuated the inclination is.
  • said elastic element directly abuts against the main frame and on the opposite side against the hinge point and/or the support for the seat.
  • Said elastic element is preferably configured to work in extension.
  • the chair preferably comprises a supporting base for resting the chair on the ground and a rod mounted on the supporting base for resting the chair on the ground, said main frame being rigidly mounted onto an upper end of said rod.
  • the chair preferably comprises a seat for a user that is rigidly coupled to said support for the seat and/or a backrest rigidly coupled to said support for the backrest.
  • Figure 1 is a schematic side view of a system according to a first embodiment of the present invention in an at-rest configuration
  • Figure 2 is a schematic side view of the system of Figure 1 in a maximum inclination configuration
  • Figure 3 is a schematic side view of a system according to a second embodiment of the present invention in an at-rest configuration
  • Figure 4 is a schematic side view of the system of Figure 3 in a maximum inclination configuration.
  • the articulation system 1 comprises a main frame 2, which is for example designed to be rigidly mounted onto an upper end of a rod 3 mounted on a base not shown) for resting a chair on the ground.
  • the articulation system 1 further comprises a support for the seat 4 and a support for the backrest 5, both of which are mounted on the main frame in an articulated manner.
  • the finished chair typically comprises a seat 6 that is rigidly coupled to the support for the seat 4 and a backrest 7 that is rigidly coupled to the support for the backrest 5.
  • the articulation system further comprises an articulation element 8 that is rigid and hinged to the main frame so that it can rotate about an axis of rotation 9.
  • the support for the seat 4 is hinged to the articulation element 8 at a first hinge point 10 preferably located at the rear of the seat, and at the front it is hinged at a second hinge point 11 located at the front of the seat to a slider 12 that is slidably movable along a guide 13 solidly constrained to the main frame 2.
  • the present invention also envisages solutions in which the first hinge point is located in a central position of the support for the seat or in a front position.
  • the slider 12 is a cylindrical pin solidly constrained to the support for the seat 4 and which, at the longitudinal ends thereof, engages a pair of guides 12 that are symmetric with respect to each other, the guides 13 being through openings afforded in the main frame 2.
  • the guide 13 determines a path for the front hinge point 1 1 having at least one rectilinear section 14 (as shown in Figures 3 and 4) or at least one curvilinear section with the concavity facing away from the axis of rotation 9 (as shown in Figures 1 and 2).
  • the articulation system 1 typically comprises at least one elastic element 20 (only schematically illustrated), for example a spring that is operatively interposed between the main frame 2 and the support for the seat 4, so as to oppose inclination of the seat with respect to the at-rest state, in a more pronounced manner the more accentuated the inclination is.
  • at least one elastic element 20 for example a spring that is operatively interposed between the main frame 2 and the support for the seat 4, so as to oppose inclination of the seat with respect to the at-rest state, in a more pronounced manner the more accentuated the inclination is.
  • the elastic element can directly abut against the main frame on one side and, on the other side, against the first and/or second hinge points and/or against the support for the seat and/or against the support for the backrest.
  • the system 1 is illustrated in an at-rest configuration, in the absence of tilting forces acting on the support for the seat and/or the backrest (or when these tilting forces do not surpass a possible preload force of the elastic element).
  • the seat 6 is typically arranged horizontally and the backrest 7 is substantially vertical.
  • the system 1 is illustrated in a maximum inclination configuration, in which the support for the seat and the support for the backrest assume the maximum inclination possible with respect to the at-rest position.
  • the path section 14 coincides with the entire path possible for the front hinge point 1 1.
  • the system can provide a stopping point for the inclination process, at the abutment of the slider 12 against an upper abutment surface 22 of the guide or when the line joining the first and the second hinge point becomes perpendicular to the tangent to the path at the front hinge point (a state beyond which the articulation element cannot rotate further).
  • the guide preferably has a lower abutment surface 21 , where, in the at-rest configuration, the slider 12 is found at the lower abutment surface.
  • the support for the backrest 5 forms one whole element (i.e. a single piece) with the articulation element 8.
  • the support for the backrest can be separate from the articulation element, but rigidly fixed to the latter.
  • the support for the backrest is connected to the articulation element in an articulated manner, and in a manner similar to the articulation of the support for the backrest with respect to the main frame and to the support for the seat disclosed in patent WO 2009/15381 1 A1 cited hereinabove, to which the reader is referred for further information.
  • the first hinge point 10 in the reference plane is interposed between a line 30 vertical to the axis of rotation 9 and a line 31 vertical to the front hinge point 1 1 , and above a line 32 horizontal to the axis of rotation.
  • the path section 14 is curvilinear and extends along an arc of a circle having a centre 40 located above and in front of the path section.
  • the arc of a circle has a radius equal to about 87 mm.
  • the seat in passing from the at-rest configuration to the maximum inclination configuration, the seat rotationally translates in such a manner that both the rear part and the front part are lifted and move rearward.
  • the relation between the elevating movement and the rearward movement of the front part varies as a function of the inclination, wherein in the final section of the movement, the elevating movement plays a greater role with respect to the beginning of the movement.
  • the first hinge point 10 is found on the opposite side of the line 30 that is vertical to the axis of rotation with respect to the second hinge point 1 1 , and above the axis of rotation.
  • the path section 14 is rectilinear and preferably inclined with respect to a horizontal direction 32, and with the latter it forms an acute angle 50 located above the horizontal direction and facing rearwards.
  • this acute angle is equal to about 15°.
  • the present invention also envisages solutions (not shown) in which this rectilinear path section is arranged horizontally, or vertically or with an inclination that is opposite the inclination shown in Figures 3 and 4.
  • the present invention also envisages solutions (not shown) in which the rectilinear path section is combined with a relative arrangement between the first hinge point and the line 30 vertical to the axis of rotation of the type appearing in Figures 1 and 2.
  • the present invention also envisages solutions (not shown) in which the curvilinear path section is combined with a relative arrangement between the first hinge point and the line 30 vertical to the axis of rotation of the type appearing in Figures 3 and 4.
  • the present invention also envisages solutions (not shown) in which in addition to the above-mentioned rectilinear or curvilinear path section, the possible entire path also comprises additional sections that may be curvilinear or rectilinear, respectively, or additional curvilinear sections with the concavities thereof facing the axis of rotation.

Abstract

L'invention concerne un système d'articulation (1) pour chaises, le système comprenant un cadre principal (2); un support pour un siège (4) monté sur le cadre principal; un élément d'articulation (8) articulé sur le cadre principal (2) de manière à pouvoir tourner autour d'un axe de rotation (9), le support du siège (4) étant articulé sur l'élément d'articulation (8) au niveau d'un premier point d'articulation (10) et sur un curseur (12) au niveau d'un second point d'articulation (11) situé à l'avant du support de siège, le curseur (12) pouvant coulisser le long d'un guide (13) solidement assujetti au cadre principal; un support d'un dossier (5) est accouplé à l'élément d'articulation (8), dans un plan de référence perpendiculaire à l'axe de rotation (9), le guide (13) déterminant un trajet pour le second point d'articulation (11), ledit trajet présentant au moins une section de trajet (14) qui est soit rectiligne, soit curviligne, la concavité étant opposée à l'axe de rotation (9).
PCT/IB2017/053030 2016-06-10 2017-05-23 Système d'articulation pour chaises WO2017212361A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR112018075328A BR112018075328A2 (pt) 2016-06-10 2017-05-23 cadeira e sistema de articulação para cadeiras
EP17733891.0A EP3468416B1 (fr) 2016-06-10 2017-05-23 Système d'articulation pour chaises
EP21175106.0A EP3903642B1 (fr) 2016-06-10 2017-05-23 Système d'articulation pour chaises

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUA2016A004261A ITUA20164261A1 (it) 2016-06-10 2016-06-10 Sistema di articolazione per sedie
IT102016000059636 2016-06-10

Publications (1)

Publication Number Publication Date
WO2017212361A1 true WO2017212361A1 (fr) 2017-12-14

Family

ID=57184633

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/053030 WO2017212361A1 (fr) 2016-06-10 2017-05-23 Système d'articulation pour chaises

Country Status (4)

Country Link
EP (2) EP3468416B1 (fr)
BR (1) BR112018075328A2 (fr)
IT (1) ITUA20164261A1 (fr)
WO (1) WO2017212361A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9302581U1 (de) * 1993-02-25 1994-06-23 Vermoegensverwaltung Franz Vog Verstelleinrichtung
WO1995012338A1 (fr) * 1993-11-01 1995-05-11 Labofa A/S Chaise de bureau a reglage synchrone du siege et du dossier
WO2010094470A2 (fr) * 2009-02-17 2010-08-26 Uhlenbrock Consulting Siège, en particulier chaise pivotante de bureau

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4219599C2 (de) * 1992-06-16 2002-08-01 Drabert Gmbh Synchronverstelleinrichtung für Bürostühle oder dergleichen
DE10241562A1 (de) * 2002-09-07 2004-03-18 Bock-1 Gmbh & Co. Synchronmechanik für Bürostühle
ATE536768T1 (de) 2008-06-17 2011-12-15 Co Fe Mo Ind S R L Verstellvorrichtung für stühle
CN101951810B (zh) 2009-02-25 2014-09-03 多纳蒂合资公司 用于协调椅背和座部之间倾斜的装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9302581U1 (de) * 1993-02-25 1994-06-23 Vermoegensverwaltung Franz Vog Verstelleinrichtung
WO1995012338A1 (fr) * 1993-11-01 1995-05-11 Labofa A/S Chaise de bureau a reglage synchrone du siege et du dossier
WO2010094470A2 (fr) * 2009-02-17 2010-08-26 Uhlenbrock Consulting Siège, en particulier chaise pivotante de bureau

Also Published As

Publication number Publication date
BR112018075328A2 (pt) 2019-03-19
EP3903642B1 (fr) 2022-07-06
EP3903642A1 (fr) 2021-11-03
EP3468416A1 (fr) 2019-04-17
EP3468416B1 (fr) 2021-06-09
ITUA20164261A1 (it) 2017-12-10

Similar Documents

Publication Publication Date Title
EP2892390B1 (fr) Chaise à dossier réglable et siège réglable
US9713380B2 (en) Chair
US9351574B2 (en) Leisure chair
US9265348B2 (en) Adjusting mechanism for setting a restoring force which acts on a backrest of a chair, and office chair having an adjusting mechanism of this type
US9713381B2 (en) Chair
US8733839B2 (en) Mechanism for an office chair
EP2608699A1 (fr) Mécanisme d'inclinaison pour une chaise et chaise
FI87978B (fi) Stol
US20160174720A1 (en) Mechanism to adjust the recline tension for a backrest of a task chair and a task chair with such kind of mechanism
US11096492B2 (en) Oscillation system for chairs
KR20190013739A (ko) 조절식 등받이가 있는 의자 또는 안락 의자
CN111955984A (zh) 具有座椅倾斜机构的椅子
EP2524623B1 (fr) Agencement de chaise
EP3468416B1 (fr) Système d'articulation pour chaises
WO2008057037A1 (fr) Siège de véhicule
US20130320732A1 (en) Synchronizing mechanism
EP3599938B1 (fr) Système d'articulation pour chaises
EP3700392A1 (fr) Système d'articulation pour chaises
CN102188116B (zh) 家具和用于家具的配件
EP3599940B1 (fr) Mécanisme d'articulation pour chaises
JP6621729B2 (ja) 椅子のロッキング構造
ITMO20100064A1 (it) Telaio per una sedia a rotelle.

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17733891

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112018075328

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 2017733891

Country of ref document: EP

Effective date: 20190110

ENP Entry into the national phase

Ref document number: 112018075328

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20181206