US20160113399A1 - Synchronizing mechanism - Google Patents

Synchronizing mechanism Download PDF

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Publication number
US20160113399A1
US20160113399A1 US14/890,515 US201414890515A US2016113399A1 US 20160113399 A1 US20160113399 A1 US 20160113399A1 US 201414890515 A US201414890515 A US 201414890515A US 2016113399 A1 US2016113399 A1 US 2016113399A1
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US
United States
Prior art keywords
support
backrest
seat
coupling element
base support
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.)
Abandoned
Application number
US14/890,515
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English (en)
Inventor
Hermann Bock
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.)
Bock 1 GmbH and Co KG
Original Assignee
Bock 1 GmbH and Co KG
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 Bock 1 GmbH and Co KG filed Critical Bock 1 GmbH and Co KG
Assigned to BOCK 1 GMBH & CO. KG reassignment BOCK 1 GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOCK, HERMANN
Publication of US20160113399A1 publication Critical patent/US20160113399A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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

Definitions

  • the invention relates to a synchronizing mechanism for a correlated seat-backrest movement of an office chair, having a base support which is placeable on a chair column, a seat support and a backrest support.
  • synchronizing mechanism is to be understood as assemblies in the seat substructure of an office chair which provide coupled-together kinematics which involve a certain relative movement of the seat and backrest with respect to one another.
  • the seat of the office chair which is generally provided with a padded seating area, is mounted on the seat support.
  • the backrest support which normally extends rearward from the actual synchronizing mechanism, carries the backrest of the office chair on an upwardly extending arm.
  • the seat support and backrest support in the case of such self-adjusting synchronizing mechanisms are usually flexibly coupled in such a manner that a pivoting movement of the backrest toward the rear induces a lifting movement of both the rear and the front region of the seat such that the entire seat is raised, or, however, just the front region of the seat is raised whilst the height of the rear region of the seat is unalterable.
  • Such self-adjusting synchronizing mechanisms are often designed in a comparatively complex manner, consist of a plurality of interacting components and/or are costly and time-consuming to assemble.
  • An object of the present invention is to provide a self-adjusting synchronizing mechanism which is structurally particularly simple. Said object is achieved by a synchronizing mechanism according to claim 1 .
  • Advantageous realizations of the invention are provided in the sub-claims.
  • One idea of the invention is to reduce the number of coupling elements, in particular the number of elements connecting the seat support and the backrest support, in order, as a result, to achieve a particularly simple structural design of the mechanism without going without the desired functionality of a synchronizing mechanism.
  • An idea of the invention over and above this is to provide a seat movement which deviates from the usual movement raising the seat where the so-called “shirt-riding-up effect” is nevertheless avoided. As a result, a particularly high level of seating comfort is achieved without having to resort to more costly and more time-consuming solutions.
  • the backrest support being flexibly connected directly, i.e. immediately and without any additional component connected in between, both to the base support so as to be pivotable about a transverse axis and consequently so as to define the main pivot axis of the mechanism, and to the seat support, in such a manner that a pivoting movement of the backrest from an initial position into a rearwardly pivoted position induces an immediate lowering movement of the rear region of the seat support, when viewed in the longitudinal direction of the chair, rearwardly downward and the seat support is flexibly connected to the base support by means of a coupling element which is hinged to the seat support and to the base support in such a manner that when the backrest performs the pivoting movement from the initial position into the rearwardly pivoted position, an immediate lifting movement of the front region of the seat support, when viewed in the longitudinal direction of the chair, is effected rearwardly upward.
  • the rear region of the seat is therefore lowered into its rearwardly pivoted position when the backrest is pivoted, whilst the front region of the seat is raised.
  • the lowering of the rear seat region in this case, is effected directly each time the initial position is departed from without a lifting movement of the rear seat region being effected for instance first of all. In this case, the position in which the backrest is not rearwardly pivoted is deemed to be the initial position.
  • the seat support being lowered into its rearward region and at the same time the front region of the seat support being raised, the seat is entrained in a synchronous manner at a defined ratio to the backrest and a the seating area is inclined.
  • the desired synchronous effect is produced where the angle of the seat support to the backrest support is changed.
  • the weight of the user directly affects the pivoting resistance which is noticeable by the user.
  • a lighter user has to overcome a clearly smaller pivoting resistance when pivoting than a heavy user.
  • Subjectively, the same “sensed” resistance is produced for each user when the backrest is pivoted.
  • the synchronous movement of the seat support can be individually adapted to the demands made on the chair.
  • the degree of inclination of the seat support when the backrest pivots or the degree of displacement of the seat support toward the base support when the backrest pivots, when seen horizontally in the longitudinal direction of the chair, toward the rear is adjustable.
  • the special synchronous movement of the mechanism according to the invention is preferably achieved in a particularly simple manner in that a coupling element, which is connected rigidly to the backrest support or is realized as an integral component part of the backrest support, is defined as a result of the positions of the hinging points of the backrest support on the base support, on the one hand, and on the seat support, on the other hand.
  • a freely pivotable coupling element on both sides between the backrest support and the seat support is no longer necessary.
  • the backrest support itself serves as a coupling element.
  • a particularly suitable coupling geometry and a synchronous movement resulting therefrom is achieved in a preferred embodiment of the invention as a result of the hinging point of the rear coupling element on the seat support, when viewed in the longitudinal direction of the seat, being located behind the hinging point of the rear coupling element on the base support in each position of the backrest support and the hinging point of the front coupling element on the seat support, when viewed in the longitudinal direction of the seat, being located in front of the hinging point of the front coupling element on the base support in each position of the backrest support.
  • This is supported in an embodiment of the invention as a result of the front coupling element being connected to the seat support by means of a pure rotating joint and not, for instance, by means of a combined rotating/sliding joint.
  • the present synchronizing mechanism is distinguished in that it is a particularly flat design such that a corresponding assembly only requires very little space.
  • a spring mechanism with one or several spring elements is provided, as the spring mechanism can be realized in such a manner that the at least one spring element connects the base support to the backrest support without requiring further installation space over and above the housing volume of the base support provided in any case.
  • the spring element is connected to the front region of the base support and to the hinging point of the backrest support on the seat support and, as a result, is arranged in a comparatively flat manner in the interior of the assembly.
  • the at least one spring element only needs to be realized in a comparatively weak manner such that all in all only small spring forces act on the components of the mechanism, which results in clearly reduced stress on the components compared to conventional mechanisms.
  • no spring forces act on the seat support as this is moved exclusively by means of the backrest support.
  • the seat support is entrained by the backrest support, more precisely by the coupling element of the backrest support which cooperates with the hinging point on the seat support, the transmission of the effective forces also being effected by means of said hinging point, whilst the coupling element which connects the seat support to the base support just has an action which co-controls the movement but does not transmit any force.
  • the spring mechanism comprises means for adjusting the preload of the at least one spring element
  • the adjusting means include an adjusting handle which can be pulled out of the base support from a rest position incorporated in the base support into an actuating position for adjusting the preload.
  • Such an adjustment handle is usable in a particularly good manner when the at least one spring element is a helical tension spring and the adjusting means include adjusting elements which are actuatable by means of the adjusting handle, by means of which the spacing between the spring ends of the helical tension spring is modifiable.
  • the adjusting of the preload can be effected by rotating the adjustment handle about the longitudinal axis of the spring using simple adjusting elements. All in all, a means for adjusting the spring force which is realizable with few components and requires particularly little space is consequently produced.
  • FIG. 1 shows a side view of the synchronizing mechanism in the initial position
  • FIG. 2 shows a side view of the synchronizing mechanism in a maximum rearwardly pivoted position
  • FIG. 3 shows a greatly abstracted representation of the interacting essential components of the synchronizing mechanism according to FIG. 1 .
  • the synchronizing mechanism 100 comprises a base support 1 which is placed onto the top end of a chair column 10 by means of a tapered receiving means 2 . Over and above this, the synchronizing mechanism 100 includes a substantially frame-shaped seat support 3 and a, in top view, fork-shaped backrest support 4 , the cheeks 5 of which are arranged on both sides of the base support 1 .
  • the seat support 3 is provided for receiving or mounting a preferably padded seating area (not shown).
  • the mounting is effected in the usual manner by means of fastening elements which are not shown in any detail.
  • a backrest which is not shown in any detail and is height-adjustable in the case of modern office chairs, is mounted on the backrest support 4 .
  • the backrest can also be integrally connected to the backrest support 4 .
  • the entire synchronizing mechanism 100 is constructed in a mirror-symmetrical manner with reference to its center longitudinal plane, which concerns the actual kinematics. In this respect, it must always be assumed in the following description that structural elements of the actual pivot mechanism are present in pairs on both sides.
  • FIGS. 1 and 3 show the initial position of the synchronizing mechanism 100 where the seat support 3 assumes a substantially horizontal position.
  • FIG. 2 shows the synchronizing mechanism 100 with the backrest support 4 in a maximum rearwardly pivoted position.
  • the backrest support 4 which is pivotable in the pivot direction 7 about a transverse axis which defines the main pivot axis 11 of the synchronizing mechanism 100 , is flexibly connected directly on the one side to the rear region 9 of the base support 1 and on the other side to the rear region 25 of the seat support 3 .
  • the backrest support 4 in this case, is hinged on the one side by means of a bearing pin to the base support 1 by way of the cheek 5 which extends in the direction of the seat front edge 8 .
  • the backrest support 4 in this case, is also flexibly connected directly to the seat support 3 on the other side, by way of a central entrainment arm 12 of the backrest support 4 which is arranged between the cheeks 5 of the backrest support 4 and extends obliquely upward in the direction of the base support 1 .
  • the first joint axis 13 which is defined by the hinging of the backrest support 4 on the base support 1 , when viewed in the longitudinal direction 14 of the chair, is arranged in front of the second joint axis 15 which is defined by the hinging of the backrest support 4 on the seat support 3 .
  • the second joint axis 15 is only slightly offset toward the rear in relation to the perpendicular on the main pivot axis of the synchronizing mechanism 100 .
  • a zenith position directly above the first joint axis 13 can, however, not be achieved.
  • a pivoting of the backrest support 4 out of the initial position into a rearwardly pivoted position is consequently always linked with a lowering movement S of the rear region 25 of the seat support 3 .
  • both joint axes 13 , 15 when viewed in the longitudinal direction 14 of the chair, are situated in front of the center of the tapered receiving means 2 .
  • the second joint axis 15 when viewed in the longitudinal direction 14 of the chair, is situated behind the center of the tapered receiving means 2 , whilst the position of the first joint axis 13 is unalterable in relation to the tapered receiving means 2 .
  • a coupling element 16 which is connected rigidly to the backrest support 4 and is realized as an integral component part of the backrest support 4 , is defined by the positions of the hinging points of the backrest support 4 on the base support 1 on the one side and on the seat support 3 on the other side, as is shown symbolically in FIG. 3 by way of the dot-dash line.
  • the coupling element 16 is composed structurally from part of the cheeks 5 , the central entrainment arm 12 and connecting elements which are not shown in any detail, but are also integral parts of the backrest support 4 and connect the cheeks 5 to the entrainment arm 12 .
  • the arrangement of the coupling element 16 directly above the tapered receiving means 2 contributes to an advantageous sequence of movement of the synchronizing mechanism 100 .
  • the front region 18 of the base support 1 is flexibly connected to the front region 26 of the seat support 3 in the front region 17 of the seat.
  • a coupling element 21 which is hinged on one side on the base support 1 and on the other side on the seat support 3 , is provided for this purpose.
  • the hinging point of the coupling element 21 on the base support 1 and consequently the third joint axis 22 is situated, when viewed in the longitudinal direction 14 of the chair, behind the hinging point of the coupling element 21 on the seat support 3 and consequently behind the fourth joint axis 23 .
  • the sequence of the arrangement of the joint axes 13 , 15 , 22 , 23 does not change even when the synchronizing mechanism 100 is in a maximum rearwardly pivoted position.
  • the rear coupling element 16 when viewed in the longitudinal direction 14 of the chair, points in each case obliquely upward and rearward and the front coupling element 21 , when viewed in the longitudinal direction 14 of the chair, points in each case obliquely upward and forward.
  • the joint axes 15 , 23 at the hinging points of the seat support 3 when viewed in the vertical direction, always extend above the joint axes 13 , 22 , which are defined by the hinging on the base support 1 .
  • the coupling elements 16 , 21 are arranged in a V-shaped manner with respect to one another, the imaginary extension lines of the coupling elements 16 , 21 intersecting below the base support 1 .
  • the relative movement of the seat support 3 and the backrest support 4 with respect to one another is determined by the position of the total of four joint axes 13 , 15 , 22 , 23 which extend through the ends of the two coupling elements 16 , 21 and are defined by the hinging points.
  • the pivoting mechanism described ensures that the backrest support 4 can be pivoted with the backrest in the pivot direction 7 about the main pivot axis 11 , here the first joint axis 13 .
  • the rearward pivoting movement of the backrest induces an immediate lowering movement S of the rear region 25 of the seat support 3 rearwardly downward and the front region 26 of the seat support 3 completes a lifting movement H rearwardly upward.
  • the seat support 3 is at the same time displaced rearward, whilst the base support 1 with the pivot bearings 13 , 22 remains fixed in position.
  • the acute angle 27 enclosed between the rear coupling element 16 and the horizontal in the non-pivoted initial position is preferably between 1.5 and 1.8 times, in a particularly preferred manner between 1.6 and 1.7 times the acute angle 28 enclosed between the front coupling element 21 and the horizontal.
  • the angle 27 in the case of the rear coupling element 16 is approximately 85° and the angle 28 in the case of the front coupling element 21 is approximately 52°.
  • the backrest support 4 is pivoted rearwardly downward preferably by between 20° and 25°, in a particularly advantageous manner rearwardly downward by between 22° and 24°.
  • said angle is 23° in relation to the initial position.
  • the inclination of the seat support 3 to the horizontal initial position in this case is preferably between 6° and 9°, in a particularly preferred manner between 7° and 8°. In the example shown, the inclination is approximately 7.3°.
  • the acute angle 28 enclosed between the front coupling element 21 and the horizontal is preferably between 1.1 and 1.3 times, in a particularly preferred manner approximately 1.2 times the acute angle 27 enclosed between the rear coupling element 16 and the horizontal.
  • the angle 28 in the case of the front coupling element 21 is approximately 74° and the angle 27 in the case of the rear coupling element 16 is approximately 62°.
  • the effective length of the rear coupling element 16 which is defined by the pivot points and consequently the position of the joint axes 13 , 15 , is preferably between 1.1 and 1.3 times, in a particularly preferred manner approximately
  • the effective length of the rear coupling element 16 is approximately 60 mm and the effective length of the front coupling element 21 is approximately 70 mm.
  • a spring arrangement with a centrally arranged spring element is provided to influence the pivoting resistance.
  • this is a helical tension spring 30 which is arranged in a sloping manner in the base support 1 and is supported on one side on the front region 18 of the base support 1 and on the other side on the backrest support 4 , more precisely on the entrainment arm 12 of the backrest support 4 , and which is loaded when the backrest support 4 is pivoted rearwardly downward.
  • the adjusting handle 34 and the threaded spindle 35 are connected together in a suitable manner such that a rotation of the adjusting handle 34 about a rotational axis 36 , which corresponds to the longitudinal axis of the spring and the spindle axis, brings about a rotation of the rotary spindle 35 when the adjusting handle 34 is pulled out of its rest position incorporated in the housing 20 of the base support 1 into an actuating position (not shown) and is rotated in said position.
  • the front thrust bearing 31 is suspended in the housing 20 of the base support 1 .
  • the threaded spindle 35 is mounted so as to be rotatable in a rear thrust bearing 27 which is fixed in position in relation to the threaded spindle 35 .
  • the rear thrust bearing 37 is flexibly connected to the entrainment arm 12 in a suitable manner in the region of the second joint axis 15 such that it is entrained when the backrest support 4 is pivoted.
  • the spring 30 in this case, is preferably arranged in such a manner and the connection between the spring 30 and the backrest support 4 is preferably realized in such a manner that in the initial position the effective line of the spring 30 is substantially perpendicular to a line between the hinging point 13 of the backrest support 4 on the base support 1 and the application point of the spring 30 on the backrest support 4 .
  • the adjusting handle 34 is pulled out into its actuating position and rotated.
  • the rear thrust bearing 37 which is operatively connected to the spring cup 32 , brings about a change in the spacing between the spring ends and consequently a change in the preload.
  • the threaded spindle 35 is rotated in such a manner that the spring cup 32 , which is mounted so as to be movable on the threaded spindle 35 , acted upon by the thrust bearing 37 , is moved in the direction of the front thrust bearing 31 .
  • the threaded spindle 35 is rotated in such a manner that the spring cup 32 on the threaded spindle 35 is moved rearward.
  • the adjusting handle 34 is then pushed back again into its rest position in the housing 20 of the base support 1 .

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
US14/890,515 2013-05-11 2014-05-08 Synchronizing mechanism Abandoned US20160113399A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE202013102059.1U DE202013102059U1 (de) 2013-05-11 2013-05-11 Synchronmechanik
DE202013102059.1 2013-05-11
PCT/EP2014/001238 WO2014183851A1 (fr) 2013-05-11 2014-05-08 Mécanique synchrone

Publications (1)

Publication Number Publication Date
US20160113399A1 true US20160113399A1 (en) 2016-04-28

Family

ID=50736033

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/890,515 Abandoned US20160113399A1 (en) 2013-05-11 2014-05-08 Synchronizing mechanism

Country Status (4)

Country Link
US (1) US20160113399A1 (fr)
EP (1) EP2994017B1 (fr)
DE (1) DE202013102059U1 (fr)
WO (1) WO2014183851A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015101546B4 (de) 2015-02-03 2023-02-16 Bock 1 Gmbh & Co. Kg Synchronmechanik
DE202016103309U1 (de) 2016-06-22 2016-07-08 Hong Kong Tiansheng International Group Limited Einstellbare Drehstuhlgrundbasis mit einem Schwingbereich nach vorne und hinten

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US3369840A (en) * 1965-07-23 1968-02-20 Dare Inglis Products Ltd Chair tilting mechanism
US5318345A (en) * 1991-06-07 1994-06-07 Hon Industries, Inc. Tilt back chair and control
US5417473A (en) * 1992-10-08 1995-05-23 Protoned B.V. Chair mechanism providing for an inclination range and inclination stop means
US5601336A (en) * 1994-04-21 1997-02-11 Manufacturas Metalicas Jevit, S.A. Auto balancing ergonomic armchair
US20010026089A1 (en) * 2000-03-17 2001-10-04 Insalaco Robert Warren Tilt assembly for a chair
US20030184140A1 (en) * 2000-05-27 2003-10-02 Joachim Bruske Chair
US20040140703A1 (en) * 2002-09-07 2004-07-22 Bock-1 Gmbh & Co. Synchronizing mechanism for office chairs
US20040140702A1 (en) * 2003-01-22 2004-07-22 Kurt Daeschle Chair with rapidly adjustable energy storing device
US20070290537A1 (en) * 2006-06-13 2007-12-20 Tung Yu Oa Co., Ltd. Recliner
US20080084102A1 (en) * 2006-10-10 2008-04-10 Werner Link Seating furniture item, in particular office chair
US20090302655A1 (en) * 2005-04-28 2009-12-10 Imarc S.P.A. Device for Adjusting the Reclining Force in Office Chair Mechanisms
US20100164263A1 (en) * 2007-06-06 2010-07-01 Malenotti S.R.L. Chair with oscillating backrest
US20110074197A1 (en) * 2007-09-06 2011-03-31 Isao Okamoto Chair
US20120056461A1 (en) * 2009-02-25 2012-03-08 Donati S.P.A. Device for synchronizing the tilt of a chair back and seat
US20130057037A1 (en) * 2010-05-26 2013-03-07 Takano Co., Ltd. Reaction force mechanism for backrest of chair and chair mounted with the same
US20130127219A1 (en) * 2010-07-31 2013-05-23 Vitra Patente Ag Seat Having A Backrest Which Can Be Adjusted To Form A Precurved Deformation
US20130234485A1 (en) * 2010-12-03 2013-09-12 Imarc S.P.A. Office chair mechanism provided with a device for adjusting the swivel force
US20140159452A1 (en) * 2011-08-03 2014-06-12 Haworth, Inc. 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
US20150123441A1 (en) * 2012-06-01 2015-05-07 Aaron Duke Chair and chair tilt control assembly
US20150282620A1 (en) * 2014-04-04 2015-10-08 Bock 1 Gmbh & Co. Kg Mechanism for an office chair
US20160007754A1 (en) * 2013-02-27 2016-01-14 L&P Property Management Company Tilt mechanism for a chair and chair
US20160309902A1 (en) * 2013-12-17 2016-10-27 Donati S.P.A. Chair with adjustable backrest
US20160345737A1 (en) * 2015-06-01 2016-12-01 Koenig + Neurath Ag Mechanism for a chair with a synchro mechanism; weight adjustment method for improved dynamic sitting experience on the part of the seat user by means of a mechanism for a chair with a synchro mechanism

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DE4118570A1 (de) * 1991-06-06 1992-12-10 Simon Desanta Stuhl, insbesondere buerostuhl
DE19823632C1 (de) * 1998-05-27 1999-09-30 Roeder Peter Stuhl, insbesondere Bürostuhl
DE202008011703U1 (de) * 2008-02-22 2009-07-02 Bock 1 Gmbh & Co. Kg Mechanik für einen Bürostuhl
CN202874564U (zh) * 2012-09-18 2013-04-17 浙江永艺家具股份有限公司 转椅底盘
DE102013005860A1 (de) * 2013-04-08 2014-10-09 Burkhard Schmitz Mechanikbaugruppe für einen Stuhl und Stuhl mit einer derartigen Mechanikbaugruppe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3369840A (en) * 1965-07-23 1968-02-20 Dare Inglis Products Ltd Chair tilting mechanism
US5318345A (en) * 1991-06-07 1994-06-07 Hon Industries, Inc. Tilt back chair and control
US5417473A (en) * 1992-10-08 1995-05-23 Protoned B.V. Chair mechanism providing for an inclination range and inclination stop means
US5601336A (en) * 1994-04-21 1997-02-11 Manufacturas Metalicas Jevit, S.A. Auto balancing ergonomic armchair
US20010026089A1 (en) * 2000-03-17 2001-10-04 Insalaco Robert Warren Tilt assembly for a chair
US20030184140A1 (en) * 2000-05-27 2003-10-02 Joachim Bruske Chair
US20040140703A1 (en) * 2002-09-07 2004-07-22 Bock-1 Gmbh & Co. Synchronizing mechanism for office chairs
US20040140702A1 (en) * 2003-01-22 2004-07-22 Kurt Daeschle Chair with rapidly adjustable energy storing device
US20090302655A1 (en) * 2005-04-28 2009-12-10 Imarc S.P.A. Device for Adjusting the Reclining Force in Office Chair Mechanisms
US20070290537A1 (en) * 2006-06-13 2007-12-20 Tung Yu Oa Co., Ltd. Recliner
US20080084102A1 (en) * 2006-10-10 2008-04-10 Werner Link Seating furniture item, in particular office chair
US20100164263A1 (en) * 2007-06-06 2010-07-01 Malenotti S.R.L. Chair with oscillating backrest
US20110074197A1 (en) * 2007-09-06 2011-03-31 Isao Okamoto Chair
US20120056461A1 (en) * 2009-02-25 2012-03-08 Donati S.P.A. Device for synchronizing the tilt of a chair back and seat
US20130057037A1 (en) * 2010-05-26 2013-03-07 Takano Co., Ltd. Reaction force mechanism for backrest of chair and chair mounted with the same
US20130127219A1 (en) * 2010-07-31 2013-05-23 Vitra Patente Ag Seat Having A Backrest Which Can Be Adjusted To Form A Precurved Deformation
US20130234485A1 (en) * 2010-12-03 2013-09-12 Imarc S.P.A. Office chair mechanism provided with a device for adjusting the swivel force
US20140159452A1 (en) * 2011-08-03 2014-06-12 Haworth, Inc. 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
US20150123441A1 (en) * 2012-06-01 2015-05-07 Aaron Duke Chair and chair tilt control assembly
US20160007754A1 (en) * 2013-02-27 2016-01-14 L&P Property Management Company Tilt mechanism for a chair and chair
US20160309902A1 (en) * 2013-12-17 2016-10-27 Donati S.P.A. Chair with adjustable backrest
US20150282620A1 (en) * 2014-04-04 2015-10-08 Bock 1 Gmbh & Co. Kg Mechanism for an office chair
US20160345737A1 (en) * 2015-06-01 2016-12-01 Koenig + Neurath Ag Mechanism for a chair with a synchro mechanism; weight adjustment method for improved dynamic sitting experience on the part of the seat user by means of a mechanism for a chair with a synchro mechanism

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Publication number Publication date
DE202013102059U1 (de) 2014-08-12
EP2994017B1 (fr) 2017-07-12
WO2014183851A1 (fr) 2014-11-20
EP2994017A1 (fr) 2016-03-16

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