EP3850989A1 - Stuhlstruktur mit einer elastisch nachgebenden rückenlehne - Google Patents

Stuhlstruktur mit einer elastisch nachgebenden rückenlehne Download PDF

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Publication number
EP3850989A1
EP3850989A1 EP21151767.7A EP21151767A EP3850989A1 EP 3850989 A1 EP3850989 A1 EP 3850989A1 EP 21151767 A EP21151767 A EP 21151767A EP 3850989 A1 EP3850989 A1 EP 3850989A1
Authority
EP
European Patent Office
Prior art keywords
coupling pin
structure according
chair structure
seat
cavity
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.)
Pending
Application number
EP21151767.7A
Other languages
English (en)
French (fr)
Inventor
Paolo Scagnellato
Jeremiah FERRARESE
Emanuele Bertolini
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.)
Sitland SpA
Original Assignee
Sitland SpA
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 Sitland SpA filed Critical Sitland SpA
Publication of EP3850989A1 publication Critical patent/EP3850989A1/de
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • 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
    • A47C7/448—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with resilient blocks

Definitions

  • the present invention relates to a chair structure with an elastically yielding backrest.
  • Chairs comprising a support structure for a seat and a backrest, distinct from the seat and bound to it by means of a connecting and supporting element.
  • the seat can be rigidly bound to the support structure or it can be bound to it by means of an elastic joint, which allows the seat to oscillate in both longitudinal and transverse directions.
  • CN 108294516 describes a chair with backrest that can be tilted backwards with respect to the seat exclusively on the longitudinal vertical plane thanks to a connection between the two obtained by means of a spherical joint and a connecting member distinct from the spherical joint and wrapped in an elastic sleeve which tends to reset the backrest in an upright condition when the stress that had caused it to tilt ceased.
  • the object of the invention is to provide a chair structure with a backrest separated from the seat and bound to it by an elastic joint.
  • Another object of the invention is to provide a chair structure, in which the backrest can be attached to the seat regardless of whether the latter is rigidly or elastically yielded to its base structure.
  • Another object of the invention is to provide a chair structure in which the elastic yielding of the backrest with respect to the seat can take place in any direction.
  • Another object of the invention is to provide a chair structure, in which the elastic yielding of the backrest with respect to the seat can be locked and restored on command.
  • Another object of the invention is to provide a chair structure, in which the degree of elastic compliance can be at least partially adjusted.
  • Another object of the invention is to provide a chair structure, in which all or at least part of the objectives indicated above can be achieved in a simple way with reliable operation and with reduced costs.
  • the chair structure according to the invention comprises a seat 2 and a backrest 4.
  • the chair structure with an elastically yielding backrest comprises a first substantially rigid portion 6 of the seat 2, constrained to a second substantially rigid portion 8 of the backrest 4 by means of a connecting element 10.
  • the connecting element 10 suitably comprises a front spherical joint 12, 14 and a rear coupling pin 16.
  • the coupling pin 16 is advantageously integral with one of the two elements 6, 10 to be connected together, and in particular to the portion 6 of the seat 2.
  • the chair structure also advantageously comprises a wall 18, which is present in the other element 10, 6, in this case the connecting element 10 and is crossed by the pin 16.
  • two elastic elements 20, 22 are applied to both sides of the wall 18 to the pin 16, kept in a state of prestress. Both are mounted on the pin 16 and of these the upper element 20 is interposed between an upper bushing 24, screwed to a threaded portion of the pin 16, and the upper surface of the wall 18, while the lower one 22 is interposed between the lower wall of the same wall 18 and a bar 26, which is embedded in the connection element 10 and has the coupling pin 16 applied. More particularly, the lower elastic element 22 is housed at least partially within a corresponding cavity obtained in the connection element 10.
  • An upper padding 30 is preferably applied to the first substantially rigid portion 6 or body of the seat 2, while another padding (not shown) is preferably applied to the second substantially rigid portion 8 of the backrest 4.
  • the body 6 of the seat 2 is provided with suitable means, not forming part of the invention, for the rigid or elastically yielding connection to a lower base structure, not shown here, for supporting and resting on the floor.
  • the attachment block 32 presents a first internal cavity 34, separated from the outside by the wall 18, in which a through hole 36 is made, and is also affected by a second cavity 14, having a substantially cylindrical shape with a hemispherical bottom, positioned anteriorly with respect to the cavity 34 and constituting the female element of the ball joint.
  • the first substantially rigid portion 6 of said seat portion 2 advantageously comprises in its rear part the block 32, presenting the cavity 34 closed by the wall 18, in which is formed the hole 36 crossed by the coupling pin 16.
  • connection element 10 between the shell 6 of the seat 2 and the shell 8 of the backrest 4 has an essentially arched conformation, with an upper portion 38, intended to be rigidly constrained to the shell 8 of the backrest 4 and with a lower portion 40, intended to be constrained in an elastically yielding manner to the block 32 for attachment of the backrest 4 to the body 6 of the seat 2.
  • the bar 26 is incorporated and/or embedded in the lower portion 40 of the connection element 10, to which, in addition to being fixed the lower end of the coupling pin 16, the male element 12 of the ball joint can also be advantageously fixed, which is housed in the cavity 14 obtained in block 32.
  • connection element 10 With particular reference to the first embodiment illustrated in the attached figures 1 - 4 , the coupling pin 16 and the male element 12 are constrained to a single bar 26 incorporated in the connection element 10.
  • the coupling pin 16 and the male element 12 of the ball joint 12, 14 can be fixed to two distinct bars 26, 26', both housed or incorporated in the connection element 10, as it will be better described with reference to the second embodiment.
  • the diameter of the coupling pin 16 is smaller than the diameter of the hole 36 obtained in the wall 18, to an extent suitable for allowing a certain play within the hole 16 itself and consequent lateral movements thereof of a corresponding amount.
  • the spherical joint 12, 14 comprises a female element, consisting of the spherical cavity 14 obtained in the substantially rigid portion 6 of the seat 2, and the male element 12, which is constrained to a bar 26, 26'incorporated in the connection 10 and is provided with a spherical portion 12 engaged in the spherical cavity 14.
  • both elastic elements 20, 22 are constituted by polymeric springs made of elastically yielding plastic material. They have a preferably cylindrical shape and are housed in the corresponding seats so as to be both in a state of prestress and to exert their elastic reaction on the block 32 on both sides of its wall 18.
  • the first elastic element 20, 20' has a substantially cylindrical shape and presents an axial cavity crossed by the coupling pin 16. More in detail, the first elastic element 20, 20' is housed at least partially within seats having a complementary shape. Preferably, one of these seats is formed in the internal cavity 34 of the substantially rigid portion 6 of the seat 2, and the other is formed in the external wall of the substantially rigid portion 6 of the seat 2 or in the connecting element 10 or partially in both.
  • the spherical joint 12, 14 is located in a more advanced position with respect to the first coupling pin 16.
  • At least the free end of the coupling pin 16 is threaded and is engaged by a bushing 24 for axial compression of the polymer springs 20, 22.
  • the connecting element 10 is constrained to the body 6 of the seat 2 following the insertion of the coupling pin 16 in the two polymeric springs 20, 22 and in the through hole 36 of the interposed wall 18 of the block 32, and of its subsequent locking in this condition with the bushing 24, which engages the threaded portion of the pin 16 and, depending on the degree of screwing, more or less compresses the polymer springs 20, 22, thus adjusting their degree of elastic response.
  • the male element 12 of the ball joint engages the female element 14 of the joint itself and keeps this engagement configuration stable.
  • any backward thrust on the backrest 4 exerted by the user sitting on the chair determines the backward inclination of the backrest itself with fulcrum on the ball joint 12, 14.
  • This inclination is allowed by the elastic yielding upon compression of the upper polymeric spring 20 and can occur mainly on the longitudinal plane of the chair although it can often also occur simultaneously on the longitudinal plane and on the transverse plane and can also have a rotational component, all being allowed from the play provided by the difference in diameter between the coupling pin 16 and the hole 36 obtained in the wall 18 of the attachment block 32.
  • this lateral component is absorbed and contrasted by the elastic compliance in the radial direction of the two polymer springs 20, 22.
  • This eccentric 42 is integral with a shaft 44 mounted at the end of a lever 46 which can be rotated by the user and extends over an arc of an amplitude correlated to the configuration of the bushing 24, in the sense that for a certain angular position of the eccentric 42 this engages the concave cavity 48 of the bushing 24 with shape coupling, while for a different rotational position it is decoupled from this.
  • the coupling pin 16 In the disengaged condition ( fig. 3 ), the coupling pin 16 is free to move axially following a backward push of the backrest 4. However, if the user sitting on the chair acts on the lever 46, in the sense of causing the rotation of the shaft 44, this maneuver determines the insertion of the eccentric 42 into the cavity 48 obtained in the bushing 24 ( fig. 4 ). Following this insertion, the axial movements of the coupling pin 16, and consequently the backward inclination of the back 4, are blocked.
  • the eccentric 42 has a concave transverse profile, that is, it is advantageously configured in such a way as to embrace the bushing also laterally itself when it engages its cavity 48, it is capable of preventing not only the axial movements of the coupling pin 16, but also its lateral movements within the hole 36, and therefore of completely blocking any movement of the backrest with respect to the seat 2.
  • the chair structure comprises at least two second elastic elements 50, 52 located in a more advanced position with respect to the coupling pin 6 and substantially symmetrical with respect to the longitudinal median plane of the structure itself.
  • the elastic elements comprise at least three polymeric springs 20', 50, 52, of which at least one first polymeric spring 20' is arranged around the coupling pin 16 and is equivalent to the spring 20 of the previous embodiment, while the other two second springs 50, 52 are interposed between the terminal part 40 of the connection element 10 and the block 32 and are preferably fixed by means of screws 54 to the connection element itself, advantageously in a symmetrical position with respect to the male element 12 which belongs to the spherical joint and which can alternatively be integral with the same bar 26, to which the coupling pin 16 is also integral, as illustrated for example with reference to the first embodiment, or with a different bar 26', which in any case is constrained to the connection element 10.
  • the two second polymeric springs 50, 52 are partially housed in the connecting element 10 and in part in the attachment block 32; moreover it is preferable that the screws 54, which constrain each second polymeric spring 50, 52 in the respective seat in the connecting element 10, are configured to adjust the pre-stress of the springs themselves.
  • the polymeric springs 50, 52 are arranged in proximity to the transverse plane passing through the spherical joint 12, 14.
  • the operation of the chair structure according to the invention in this second embodiment is similar to the operation of the first embodiment as regards the locking system of the backrest joint 4 with respect to the seat 2 and the elastic reaction to the inclination of the backrest 4 backwards, but it differs from that in the way in which the elastic reaction to the lateral inclination of the backrest 4 backwards takes place, since in this case it is essentially due to the compression of one or the other second polymeric spring 50, 52.

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  • Chairs Characterized By Structure (AREA)
EP21151767.7A 2020-01-16 2021-01-15 Stuhlstruktur mit einer elastisch nachgebenden rückenlehne Pending EP3850989A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202000000682 2020-01-16

Publications (1)

Publication Number Publication Date
EP3850989A1 true EP3850989A1 (de) 2021-07-21

Family

ID=70295768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21151767.7A Pending EP3850989A1 (de) 2020-01-16 2021-01-15 Stuhlstruktur mit einer elastisch nachgebenden rückenlehne

Country Status (1)

Country Link
EP (1) EP3850989A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308538A1 (de) * 1987-09-25 1989-03-29 Christof Stoll GmbH & Co KG Stuhl-Rückenteil
CN108294516A (zh) 2018-01-25 2018-07-20 杭州鼎绘家居科技有限公司 一种办公椅

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308538A1 (de) * 1987-09-25 1989-03-29 Christof Stoll GmbH & Co KG Stuhl-Rückenteil
CN108294516A (zh) 2018-01-25 2018-07-20 杭州鼎绘家居科技有限公司 一种办公椅

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