US20100308633A1 - mechanism for adjusting the pre-load of a stiffening spring for seats - Google Patents

mechanism for adjusting the pre-load of a stiffening spring for seats Download PDF

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Publication number
US20100308633A1
US20100308633A1 US12/739,254 US73925410A US2010308633A1 US 20100308633 A1 US20100308633 A1 US 20100308633A1 US 73925410 A US73925410 A US 73925410A US 2010308633 A1 US2010308633 A1 US 2010308633A1
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United States
Prior art keywords
rod
spring
mobile
mechanism according
regulating
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Abandoned
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US12/739,254
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English (en)
Inventor
Armando Donati
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Donati SpA
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Donati SpA
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Assigned to DONATI S.P.A. reassignment DONATI S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DONATI, ARMANDO
Publication of US20100308633A1 publication Critical patent/US20100308633A1/en
Abandoned 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
    • 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
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • 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
    • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
    • 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
    • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
    • A47C1/03274—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs of torsion type

Definitions

  • the present invention relates to a mechanism for regulating (adjusting) the preload of a stiffening spring of a mobile element on a relative support frame belonging to a seating device, such as an office chair, for example.
  • spring refers to any type of non permanently deformable element, at, least in a direction defined by its two ends, for example when it is subject to traction or compression, presenting an elastic reaction by returning to its non-deformed conformation, at least along said direction.
  • said term can refer indifferently to cylindrical helical springs, flat spring or any other type of spring known to technical art, possessing the characteristic described above.
  • the term support frame does not necessarily refer to a fixed frame of the seating device, but simply a frame with respect to which the mobile element can perform a relative motion. Therefore, according to this definition, the support frame can be the frame that forms the base of the chair and the mobile element can alternatively be the backrest frame or the seating frame, or some other frame.
  • the aforesaid support frame can coincide with a seating frame forming part of a synchronizing mechanism for chairs, wherein the mobile element is the backrest frame, even in cases where both the aforesaid backrest and seating frames can be rotated—precisely in a synchronised manner—with respect to the base of the chair.
  • Prior art describes chairs equipped with a backrest that can be reclined with respect to the seat, for example, or having an arm rest that can pivot with respect to the chair base, or some other similar action, wherein a stiffening spring, with a pre-load that can be calibrated, is positioned between the seating frame, or any other support frame of the chair, and the relative backrest frame, or any other mobile element of said chair, aimed at controlling the slope of the aforesaid mobile element with a force that can be regulated by the user.
  • the international patent application WO 02/032261 in the name of RODER describes an office chair equipped with a synchronizing mechanism of the slope of the seating frame with the slope of the backrest frame, wherein a variable pre-load stiffening spring is provided to control the slope of the seating frame with respect to the base of the chair.
  • the calibration of the preload of said stiffening spring in the RODER patent right constituted in particular by a cylindrical helical spring, occurs thanks to the approaching or retreating of a regulating cursor for one end of the spring, to a striker for the other end of the spring, said striker being integral to the mobile element.
  • the regulating cursor constituted by a retainer element integral to one end of a rod that is in turn mounted telescopically inside a sleeve, is caused to translate with respect to a fixed striker integral to the aforesaid sleeve, thanks to a complex system of levers and cranks which can be operated by the user, using a control knob.
  • the regulating cursor rod is also mobile with respect to the sleeve, or vice versa, during the rotation of the fixed element with respect to the mobile element.
  • the mechanism described in the RODER application that provides that the possible stroke of the rod with respect to the sleeve, during the rotation of the mobile element, is modified because of the calibrating operations of the preload of the stiffening spring.
  • the rod stroke inside the sleeve, and therefore the dimensions of the rod and the sleeve must be large enough to prevent the rod from reaching the end of stroke inside the sleeve, with resulting increase of the overall dimensions.
  • said rod of the regulating cursor is subject to both the loads from the levers and cranks system for regulating the preload of the stiffening spring, as well as the force developed by the user during the rotation of the aforesaid mobile element of the chair, said rod must be appropriately dimensioned and suitably positioned within the mechanism of the chair, to prevent undue loss of the calibration required by the user, during the rotation of the mobile element of the chair.
  • the preload regulating system of the spring resulted as not being easy to produce, given the complexity of the levers system involved.
  • the regulating system of the patent application WO 02/032261 also involves frequent moving of the control knob with respect to the chair base, according to the calibration required by the user, with resulting difficulty of use for the user, who must search for and find the knob in a range of different positions when the pre-load needs to be adjusted.
  • the European patent application EP-A-1477028 teaches, among others, how it is possible to realise a calibration mechanism of thee pre-load of a stiffening spring for a reclining element capable to be sloped with respect to a support frame of a chair, comprising a regulating cursor constituted by a threaded rod that is engaged, at one end, inside a nut-screw integral to the reclining element, and that has, at the other end, a retainer for one end of the stiffening spring.
  • the spring is positioned between the regulating cursor and a striker realized on a support frame.
  • the rotation of the threaded rod that can be for example controlled by a worm screw orthogonally engaging a toothed element integral to the same threaded rod, causes the translation of this latter with respect to the aforesaid nut-screw and therefore the regulation of the distance between the retainer of the regulating cursor and the striker of the support frame.
  • This BOCK mechanism allows for the operation of a knob to rotate around a fixed axis to control the calibration of the springs in contrast with the slope of the backrest, but the relative sliding regulating rods slide freely, unprotected, inside the mechanism, with resulting possible problems of undesirable mechanical interference with the present members.
  • control rods with respect to a guide that involves only a limited portion of the rod, can cause their undesirable movement in non-axial directions.
  • the European patent application EP-A-0360763, to COFEMO concerns a regulating mechanism of the pre-load calibration for a stiffening spring of the reclinable backrest of an office chair, that comprises a regulating cursor, having a resting surface for one end of the spring, which engages by means of threaded means with a guide rod, hinged to a fixed support of the backrest of the chair.
  • the other end of the stiffening spring abuts against a mobile striker which is integral to the aforesaid backrest by means of a protection sleeve, telescopically engaged with an operating knob of the regulating cursor.
  • the rotation of the regulating cursor that is operated by the aforesaid operating knob, co-axial with the guide rod, determines the axial movement of said regulating cursor along the aforesaid guide rod and therefore the axial variation, under compression, of the length of the spring, thus causing the pre-load calibration, of the spring.
  • the COFEMO solution does not provide for the movement of the guide rod inside the regulating mechanism of the chair, but the connection between the said guide rod and the fixed frame implies that the hinge used for said rod has mechanical characteristics such that they are able to withstand the forces, sometimes even considerable, exercised axially on the said guide rod, with the resulting over-size of the parts involved. However, any possible over-size does not prevent the fact that the said hinge between the guide rod and the fixed frame can become subject to wear.
  • one aim of the present invention is to provide a mechanism for the preload regulation of a stiffening spring of a mobile element of a chair, with respect to a relative support frame, which does not present the drawbacks of prior technical art described above, and that is able to provide high precision and operating ease and that, at the same time, is structurally uncomplicated and that prevents the unguided sliding action of mobile elements inside the mechanism.
  • Another aim of the present invention is to provide a mechanism for the pre-load calibration of a stiffening spring of a mobile element of a chair, such as the backrest frame for example, which is particularly compact and easy to operate, for instance in a synchronizing mechanism of the backrest frame with the seating frame of an office chair.
  • the mechanism for regulating (adjusting) the preload of at least one stiffening spring for a element rotating with respect to at least one support frame of a seating device comprises:
  • this rod-shaped guide element is integrally fixed to the support frame and it is also constrained, in correspondence to one of its ends, at a distance from the integral link to the support frame, in a sliding manner, preferably in a telescopic manner, to a mobile striker.
  • the rod-shaped guide element is fixed to both the support frame, to which it is linked in an integral mariner (and therefore in a manner similar to a fixed joint) preferably positioned at, or near, its end, as well as to the mobile element of the seating device, thanks to the fact that the mobile striker for the stiffening spring, constrained to said mobile element, is able to move with respect to the aforesaid rod-shaped guide element.
  • This configuration which can be implemented in a geometrically compact and structurally simple manner, provides the user with easy operation of the regulating cursor of the stiffening spring.
  • telescopic refers herein and hereafter to a system constituted of at least two sliding elements with respect to one another, wherein one of the elements is mounted at least partially inside the other, in such a manner to exit or return inside the latter during the relative sliding action of said elements.
  • a system constituted of a rod connected in a sliding manner inside a sleeve is covered by the concept of “telescopic system” used herein.
  • said means used to transform the rotary motion into a translation movement can comprise a mobile head equipped externally with grooves having a substantially helical form that couple with the teeth of a worm screw, obtained on at least part of the aforesaid control shaft.
  • the mobile head with the helical grooves is connected in a sliding manner to the rod-shaped guide element and therefore also forms part of the aforesaid regulating cursor for the stiffening spring.
  • the stiffening spring is a helical cylindrical spring, mounted in a manner to be co-axial with the telescopic system formed by the aforesaid regulating cursor and by the complementary fixed element.
  • the aforesaid mobile element is the backrest frame of a synchronizing mechanism and the support frame is the seating frame of an office chair.
  • FIG. 1 is a cutaway view, seen from above, of an apparatus for an office chair comprising a mechanism for regulating the preload of a stiffening spring according to a particular aspect of the present invention
  • FIG. 2 is a partial cutaway side view of the mechanism shown in FIG. 1 ;
  • FIG. 3 is a schematic side view in cross-section of the mechanism shown in FIG. 1 .
  • the mechanism for regulating (adjusting) the preload of at least one stiffening spring 3 for a mobile element 2 of a chair, such as a backrest frame for example, with respect to a support frame 1 , such as a seating frame for example, illustrated herein comprises a mobile striker 7 which is connected to a mobile element 2 and onto which one end of a spring 3 rests, or in any case it is linked to, and a resting element (or linking element) 6 , mounted in a sliding manner on a rod-shaped guide element 4 constrained to the support frame 1 , for the other end of the spring 3 .
  • the spring 3 is of the type wherein the distance between the two ends establishes the pre-load, in other words said distance determines the intensity of the elastic reaction force exercised by the said spring 3 when it is compressed further or placed in traction. Therefore, the variation of the distance between the mobile striker 7 and resting element 6 , permits the regulation of said pre-load, making the said spring 3 more or less stiffen with respect to the mobile element 2 , as will be shown further on.
  • said spring 3 is in particular, a helical cylindrical torsion spring that is mounted in a coaxial manner on the rod-shaped guide element 4 , between the mobile striker 7 and resting element 6 .
  • any other arrangement of the spring 3 between the two strikers 6 and 7 can be realised as an alternative, on condition that the variation in the distance between the two strikers 6 and 7 establishes the variation in the length of the spring 3 , in its pre-loaded configuration.
  • the resting element 6 together with means for its motion, at least in translation along the guide element 4 , as will be illustrated, therefore forms part of a regulating cursor 6 , 10 which, by sliding along the guide element 4 , establishes the variation in the distance between the two ends of the spring 3 .
  • the mobile striker 7 is in particular constrained, by means of a pin 14 , in an orthogonal position to the rod-shaped guide element 4 , to the backrest frame 2 , or to a part thereof, while the rod-shaped guide element 4 of the regulating cursor 6 , 10 , constituted of a preferably rigid rod, is advantageously fixed in a manner substantially integral to the seating frame 1 , and at the same time is engaged, by means of a sliding link (i.e. a sliding block), with the mobile striker 7 .
  • a sliding link i.e. a sliding block
  • the rod 4 of the present embodiment is constrained to the seating frame 1 thanks to the engagement of the end of a pin 17 inside a relative housing 16 set on the seating frame 1 , and it is also constrained in a sliding manner to the mobile striker 7 which, as can be seen for example in FIG. 3 , is constituted of an annular projection from a sleeve 5 .
  • the rod 4 at the end opposite to the end integral to the seating frame 1 , is linked in a telescopic manner in the hole 15 of the sleeve 5 .
  • the kinematic mechanism formed in this manner therefore involves the rod 4 being fixed with respect to sleeve 5 , which, during the reclining (tilting) action of the backrest frame 2 , moves along said guide rod 4 , thanks to the rod being engaged in the relative hole 15 .
  • both the rod 4 qt its end which is engaged inside the sleeve 5 , as well as the hole 15 can assume a quadrangular section.
  • the regulating cursor 6 , 10 constrained to slide along the rod 4 , includes a resting element 6 for one end of the spring 3 , constituted of a perforated disk inserted into the rod 4 , which is moved by a mobile head 10 , which is linked, at least in translation, along the rod 4 , and is actuated by means of the kinematic mechanism 9 , 10 , 11 , by a control knob 8 .
  • Said control knob 8 is in turn mounted on the seating frame 1 , which is constrained to a relative base 12 of an office chair.
  • the resting disk 6 is free to slide along the guide rod 4 and the mobile head 10 is arranged in contact with said resting disk 6 , at the part opposite the part in which the spring 3 is engaged, and the mobile head 10 can be linked to the rod 4 by means of a threaded type coupling.
  • the mobile head 10 can be provided with an internal threading which is coupled with a complementary threading provided at least on the terminal part of the rod 4 , in proximity to the constraint 16 , 17 , in such a manner that said mobile head 10 is able to roto-translate along said rod 4 in a manner controlled by said threaded coupling.
  • any other type of coupling between the mobile head 10 and the rod 4 that is able to guarantee the controlled translation action of the head 10 on the rod 4 , remains within the required scope of protection for the present invention.
  • the mobile striker allows the transmission of the force exercised by the spring 3 on the backrest frame 2
  • the resting disk 6 transmits the force of the spring 3 onto the mobile head 10 , which in turn transmits the force to the knob 8 , which is constrained to the seating frame 1 .
  • the spring 3 acts by elastically contrasting its compression, and the relative rotation of the backrest frame 2 with respect to the seating frame 1 , or to the base 12 , thus permitting the movement of the mobile striker 7 with respect to the regulating cursor 6 , 10 , with the resulting compression of the spring 3 , which therefore progressively stiffens the backrest frame 2 , thwarting the rotation of this latter with respect to the seating frame 1 .
  • any other type of configuration for said regulating cursor such as its being realised in a single piece for example, remains within the protective scope of the present invention.
  • the force i.e. pre-load
  • the spring 3 counters the rotation of the frame 2 with respect to the frame 1 , as stated previously, can be regulated by means of the variation of the distance of the mobile striker 7 from the regulating cursor 6 , 10 .
  • the regulation of the distance between the resting disk 6 and the mobile striker 7 is obtained thanks to the controlled sliding of the mobile head 10 on the guide rod 4 , provided by the engagement of a control rod 11 , kinematically connected in rotation to the knob 8 , with the aforesaid mobile head 10 .
  • the mobile head 10 co-axial with the guide rod 4 , and incidental with said control rod 11 , is induced to translate (or roto-translate, in the case where said head 10 is constrained to the rod 4 by a threaded type coupling), by gear means 10 , 11 , to transform the rotational movement of the control rod 11 into a movement of the head 10 that is at least translational, and therefore also of the resting disk 6 , along the fixed rod 4 , with respect to sleeve 5 , and therefore also to the mobile striker 7 .
  • said gear means can advantageously comprise, in the embodiment illustrated herein, a worm screw 11 , made on at least part of the aforesaid control rod, which meshes in a substantially orthogonal manner, with the mobile head 10 , appropriately equipped on its external surface with helical grooves and therefore, relative teeth.
  • This roto-translation of the mobile head 10 is preferably controlled thanks to the threaded type coupling described above, between said head 10 and at least pad of the rod 4 .
  • the rotation direction of the worm screw 11 establishes the corresponding rotation direction of the head having the helical grooves 10 and therefore, the relative translation direction of the resting disk 6 .
  • the rotation in one direction or another of the control rod 11 causes the travel in one direction or the other direction of the mobile head 10 , with the resulting approach or retreat of the resting disk 6 , maintained in engaged position with the head 10 by the spring 3 , with respect to the mobile striker 7 .
  • the worm screw 11 which can be seen in particular in FIG. 2 , is actuated by a handle 8 , connected in a revolving manner, as stated previously, to the seating frame 1 or, alternatively, to the base 12 of the chair, by means of a reduction gear unit 9 with cogged wheels 9 a , 9 b . More precisely, the revolving motion of the handle 8 around the axis of the relative support shaft 13 is transmitted to the control rod 11 , at least provided with a portion having a worm screw conformation, by means of the same shaft 13 , integral to a first cogged wheel 9 a that meshes with a second cogged wheel 9 b , in turn integral to the control rod 11 .
  • the rotation, of the knob 8 in a clockwise direction performed by the user will determine the corresponding rotation of the shaft 13 and of the cogged wheel 9 a and therefore the rotation, in an anticlockwise direction, of the wheel 9 b and of the worm screw 11 .
  • This variable compression of the spring 3 determines the elastic response of the spring in the case of any further compression strain.
  • the anticlockwise rotation of the knob 8 causes, by means of the reduction gear unit 9 , the rotation of the worm screw 11 in a clockwise direction and the resulting roto-translation of the resting disk 6 along the regulating rod 4 , operated by means of the helical groove head 10 .
  • the translation of the regulating cursor 6 , 10 occurs by moving away from the sleeve 5 , and therefore causes the resting disk 6 to move away from the mobile striker 7 , together with the relative distension of the helical cylinder spring 3 .
  • the use of a guide rod 4 fixed both with respect to the regulating cursor 6 , 10 of the pre-load of the stiffening spring 3 for the mobile element 2 of a chair, as well as with respect to the said mobile element 2 , provides a precise regulation of the preload, that is exempt of any jamming, and at the same time, allows the mechanism to be made in a compact and structurally solid manner.
  • a telescopic system 4 , 5 combined with the aforesaid gear means 10 , 11 makes the mechanism for regulating the preload of a stiffening spring of the present invention, particularly compact and structurally simple to construct.

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Hydraulic Control Valves For Brake Systems (AREA)
  • Springs (AREA)
  • Chairs Characterized By Structure (AREA)
US12/739,254 2007-10-30 2007-10-30 mechanism for adjusting the pre-load of a stiffening spring for seats Abandoned US20100308633A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/IT2007/000760 WO2009057168A1 (en) 2007-10-30 2007-10-30 A mechanism for adjusting the pre-load of a stiffening spring for seats
CNU2008200060322U CN201216346Y (zh) 2007-10-30 2008-01-25 座椅的预紧力调节机构

Publications (1)

Publication Number Publication Date
US20100308633A1 true US20100308633A1 (en) 2010-12-09

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ID=42320539

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/739,254 Abandoned US20100308633A1 (en) 2007-10-30 2007-10-30 mechanism for adjusting the pre-load of a stiffening spring for seats

Country Status (6)

Country Link
US (1) US20100308633A1 (de)
EP (1) EP2209401B1 (de)
CN (1) CN201216346Y (de)
AT (1) ATE499862T1 (de)
DE (1) DE602007012944D1 (de)
WO (1) WO2009057168A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9549614B2 (en) 2014-04-04 2017-01-24 Bock 1 Gmbh & Co. Kg Mechanism for an office chair
IT201600071468A1 (it) * 2016-07-08 2018-01-08 Co Fe Mo Ind S R L Meccanismo di oscillazione per sedie
CN108348072A (zh) * 2015-10-15 2018-07-31 高飞模工业有限责任公司 用于椅子的摆动机构

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WO2010103554A1 (en) * 2009-03-10 2010-09-16 Effe Tre S.R.L. Support device of a chair with tilting backrest
CN103330403B (zh) * 2013-07-19 2016-02-10 湖州奥圣家具有限公司 一种转椅的调节装置
CN103340525B (zh) * 2013-07-19 2016-06-08 浙江利帆家具有限公司 一种方便调节的转椅
CN103330406B (zh) * 2013-07-19 2016-02-17 湖州奥圣家具有限公司 一种侧向调节转椅的改进结构
CN106474712A (zh) * 2016-08-18 2017-03-08 郭周建 多功能电动弹跳式棒球、网球发球机
CN111765190B (zh) * 2020-06-08 2022-02-18 中国航发北京航科发动机控制系统科技有限公司 一种预紧力调节给定装置
GB2610051B (en) * 2021-07-27 2023-12-27 Actiu Berbegal Y Formas S A Device for the synchronized tilt adjustment of seats and backrests of chairs

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US2859799A (en) * 1956-05-03 1958-11-11 Edwin R Moore Functional posture controller for chairs
US2956619A (en) * 1958-10-03 1960-10-18 Cramer Posture Chair Company I Tilt back chair
US4232900A (en) * 1979-03-26 1980-11-11 Collier-Keyworth Company Chair control
US5328237A (en) * 1991-06-26 1994-07-12 Okamura Corporation Shock absorber for a back rest of a chair
US5397165A (en) * 1992-10-20 1995-03-14 Paltechnica Nitzanim Synchronous movement adjustable seat support
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9549614B2 (en) 2014-04-04 2017-01-24 Bock 1 Gmbh & Co. Kg Mechanism for an office chair
CN108348072A (zh) * 2015-10-15 2018-07-31 高飞模工业有限责任公司 用于椅子的摆动机构
IT201600071468A1 (it) * 2016-07-08 2018-01-08 Co Fe Mo Ind S R L Meccanismo di oscillazione per sedie
WO2018007888A1 (en) * 2016-07-08 2018-01-11 Co.Fe.Mo. Industrie S.R.L. Tilting mechanism for chairs
US10813458B2 (en) * 2016-07-08 2020-10-27 Co.Fe.Mo. Industrie S.R.L. Tilting mechanism for chairs

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Publication number Publication date
EP2209401B1 (de) 2011-03-02
CN201216346Y (zh) 2009-04-08
DE602007012944D1 (de) 2011-04-14
EP2209401A1 (de) 2010-07-28
ATE499862T1 (de) 2011-03-15
WO2009057168A1 (en) 2009-05-07

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