EP0394784A1 - Dispositif à frottement pour ajuster l'inclinaison d'un siège, en particulier d'une chaise de bureau - Google Patents

Dispositif à frottement pour ajuster l'inclinaison d'un siège, en particulier d'une chaise de bureau Download PDF

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Publication number
EP0394784A1
EP0394784A1 EP90107132A EP90107132A EP0394784A1 EP 0394784 A1 EP0394784 A1 EP 0394784A1 EP 90107132 A EP90107132 A EP 90107132A EP 90107132 A EP90107132 A EP 90107132A EP 0394784 A1 EP0394784 A1 EP 0394784A1
Authority
EP
European Patent Office
Prior art keywords
pin
sectors
clutch
box
box casing
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.)
Withdrawn
Application number
EP90107132A
Other languages
German (de)
English (en)
Inventor
Achille Baruffaldi
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.)
Lineager SRL
Original Assignee
Lineager SRL
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
Priority claimed from IT8920289A external-priority patent/IT1230093B/it
Priority claimed from IT02275489A external-priority patent/IT1237193B/it
Application filed by Lineager SRL filed Critical Lineager SRL
Publication of EP0394784A1 publication Critical patent/EP0394784A1/fr
Withdrawn legal-status Critical Current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
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/027—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by means of clamps or friction locking members
    • 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
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • A47C1/0325—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by means of clamps or friction locking members

Definitions

  • This invention relates to a friction device for adjusting the inclination of a seat.
  • the invention finds particular application in office chairs provided with a backrest in which the seat adjustment can also involve simultaneous and synchronous inclination of the backrest, so making the position of the occupant as comfortable as possible.
  • An object of the present invention is to provide a device for adjusting the inclination of a seat, in particular an office chair, formed in such a manner as to obviate the drawbacks of conventional devices.
  • the device for adjusting the inclination of a seat, in particular an office chair, and of its possibly associated backrest, of the type comprising a box casing rigid with the frame and within which there are pivoted sectors possibly associated with a linkage providing connection to box-shaped blocks containing a seating for the chair column and for the shaft which supports the backrest, is characterised by comprising a friction clutch associated with said box casing and with said sectors, and means for engaging and disengaging said friction clutch.
  • the device of the invention is of particular but not exclusive application to an office chair such as that indicated overall by the reference numeral 1 in Figure 1, of the type comprising a central column 2 supporting a frame 3 which constitutes the seat and is rigid with a box casing 4, from which a shaft 5 extends to support a backrest 6.
  • the frame 3 and backrest 6 can be conveniently covered with a suitable padding material (not shown).
  • the box casing 4 comprises two lateral longitudinal walls 7, 7′ between which two box-shaped blocks 8 and 9 are conventionally housed, the block 8 comprising a seating 10 for receiving the upper end of the column 2 and a spring assembly, indicated overall by 11, for urging the frame 3 into the horizontal position, the block 9 comprising a seating 12 for receiving the lower end of the shaft 5 which carries the backrest 6.
  • the sectors 13, 13′ are conventionally connected to the block 8 by a first bar 15 pivoted on a pin 15′ transverse to the sectors 13, 13′ and on a pin 15 ⁇ , and are connected to the block 9, pivoted at 17 on the box casing 4, by a second bar 16, which is pivoted on a pin 16′ transverse to the sectors 13, 13′ and on a pin 16 ⁇ .
  • a linkage enables the inclination of the frame 3 and of the backrest 6 to be synchronized, as is known in this field.
  • the sectors 13, 13′ each comprise an arched slot 18 through which a pin 19 passes transverse to the box casing 4 and idle at the walls 7 and 7′, to contain and guide a friction clutch indicated overall by 20 and consisting of a plurality of plates 20 connected together at one end by a common pin 22 with interposed washers 23, and traversed at the opposite end by the pin 19, with discs 24 of material having a high coefficient of friction interposed between one plate and the next.
  • the pin 19 comprises a nut 25 engaging an end washer 26 of the friction clutch 20, there being provided at the opposite end to the washer 26 at least one (two in the illustrated case) further washer 27 abutting against a fixed block 28.
  • the free end 19′ of the pin 19 emerging from the wall 7 of the box casing 4 is contained in a compartment 29 containing a plurality of cup springs 30 resting against the face 31 of a mobile block 32, the opposing face 33 ( Figures 3a, b, c and d) of which is in the form of an inclined plane with steps 34 cooperating with corresponding steps provided on the opposing face, also of inclined plane extension, of a fixed block 35 axial to the mobile block.
  • a rod 36 projecting laterally from the frame 3 and provided with a knob passes freely through the fixed block 35, its end distant from the knob engaging the mobile block 32 by way of a fixed nut 38, so that a rotation of the rod 36 produces a corresponding rotation of said mobile block 32 and consequently, by virtue of the presence of the opposing inclined faces, a movement of the rod 36 in the direction of the arrow F, so thrusting the pin 19 in the same direction against the action of the cup springs 30. In this manner the contact pressure between the plates 21 and discs 24 is reduced, so releasing the clutch 20 and enabling the frame 3 and backrest 6 to assume the desired inclined position with continuity.
  • the limitation on the rotation of the mobile block 32 can be obtained by a pin 39 slidable in a semicircular guide 39′ provided in the opposite block.
  • the movement (arrows F, F′) of the pin 19 is obtained by swivelling the rod 36 in the direction of the arrows H, H′ to cause a cam element 36′ to act.
  • the ends 18′ of the slots 18 act as limit stops for the inclination of the assembly 3, 6.
  • the box casing 40 comprises two lateral longitudinal walls 70, 70′ between which two box-shaped blocks 80 and 90 are conventionally housed, the block 80 comprising a seating 100 for receiving the upper end of the column 2 and a seat 110 for housing a conventional spring assembly (not shown) for urging the frame 3 into the horizontal position, the block 90 comprising a seating 120 for receiving the lower end of the shaft 5 which carries the backrest 6.
  • the sectors 130 each comprise an arched slot 160 and, in proximity to said slot, a through hole for a pin 170 connecting said sectors to one end of bars 180, the other ends of which are pivoted to the box-­shaped block 90 by a pin 190.
  • the device comprises two bars 180 for each sector 130, between the opposing bars 180 of two adjacent sectors there being provided a spacer 200.
  • the spacers 150 provided on the pins 140 and the spacers 200 provided on the pin 190 are of material having a high coefficient of friction.
  • the head 220 of which comprises a square appendix 220′ which penetrates and abuts against the lateral wall 70 of the box casing 40, its opposite end 230 being threaded to receive the female end 240 of a control rod 250 carrying a knob 260.
  • the variation in the position of the frame 3 and backrest 6 is obtained synchronously by the interconnection between the sectors 130 and bar 180 via the pin 170, the position of these components being controlled by the control rod 250.
  • the sectors 130 on screwing this rod down on the threaded pin 210, the sectors 130 mutually tighten to prevent their position varying relative to the pin 210, by virtue of the interposed bushes. This thus locks the system, which is released by unscrewing said rod.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Chairs Characterized By Structure (AREA)
EP90107132A 1989-04-27 1990-04-13 Dispositif à frottement pour ajuster l'inclinaison d'un siège, en particulier d'une chaise de bureau Withdrawn EP0394784A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT8920289A IT1230093B (it) 1989-04-27 1989-04-27 Dispositivo a frizione per la regolazione dell'inclinazioe di un sedile, in particolare di una seggiola per ufficio.
IT2028989 1989-04-27
IT2275489 1989-12-20
IT02275489A IT1237193B (it) 1989-12-20 1989-12-20 Dispositivo a frizione per la regolazione dell'inclinazione di un sedile, in particolare di una seggiola per ufficio

Publications (1)

Publication Number Publication Date
EP0394784A1 true EP0394784A1 (fr) 1990-10-31

Family

ID=26327479

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90107132A Withdrawn EP0394784A1 (fr) 1989-04-27 1990-04-13 Dispositif à frottement pour ajuster l'inclinaison d'un siège, en particulier d'une chaise de bureau

Country Status (3)

Country Link
EP (1) EP0394784A1 (fr)
AU (1) AU5374990A (fr)
CA (1) CA2014777A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2252725A (en) * 1991-02-15 1992-08-19 Ashfield Eng Co Locking adjustment for furniture
EP0549538A1 (fr) * 1991-12-20 1993-06-30 CO.FE.MO. S.p.A. Support central pour régler l'inclinaison d'un siège oscillant
WO1994009682A1 (fr) * 1992-10-23 1994-05-11 Doerner Products Ltd. Frein unitaire pour mecanisme d'inclinaison d'une chaise
ES2060487A2 (es) * 1991-11-27 1994-11-16 Ind Y Fundiciones Iglesias S A Mejoras introducidas en los dispositivos reguladores de la inclinacion de respaldos de asientos de oficina y similares.
US5447357A (en) * 1992-08-21 1995-09-05 Dauphin Entwicklungs- U. Beteiligungs-Gmbh Chair with inclinable seat
WO1999009861A1 (fr) * 1997-08-25 1999-03-04 Sylve Moheim Chaise de travail
WO2003032779A1 (fr) * 2001-10-13 2003-04-24 Voelkle Rolf Meuble servant de siege, en particulier chaise pivotante de bureau

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045925A1 (fr) * 1980-08-08 1982-02-17 F. Martin Steifensand Sitzmöbel- und Tischfabrik GmbH & Co. KG Meuble d'assise, particulièrement chaise de bureau tournante
WO1986000508A1 (fr) * 1984-07-10 1986-01-30 Voelkle Rolf Siege avec dispositif de blocage pour modifier d'inclinaison du dossier et/ou de l'assise
GB2193884A (en) * 1986-08-16 1988-02-24 Chair Mechanisms Limited A tilting mechanism for a chair
EP0265782A2 (fr) * 1986-10-15 1988-05-04 Rolf Völkle Siège

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045925A1 (fr) * 1980-08-08 1982-02-17 F. Martin Steifensand Sitzmöbel- und Tischfabrik GmbH & Co. KG Meuble d'assise, particulièrement chaise de bureau tournante
WO1986000508A1 (fr) * 1984-07-10 1986-01-30 Voelkle Rolf Siege avec dispositif de blocage pour modifier d'inclinaison du dossier et/ou de l'assise
GB2193884A (en) * 1986-08-16 1988-02-24 Chair Mechanisms Limited A tilting mechanism for a chair
EP0265782A2 (fr) * 1986-10-15 1988-05-04 Rolf Völkle Siège

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2252725A (en) * 1991-02-15 1992-08-19 Ashfield Eng Co Locking adjustment for furniture
GB2252725B (en) * 1991-02-15 1995-04-19 Ashfield Eng Co Wexford Ltd An adjustment mechanism for furniture
US5423595A (en) * 1991-02-15 1995-06-13 Ashfield Engineering Company Wexford Limited Adjustment mechannism for locking relatively movable parts of furniture
ES2060487A2 (es) * 1991-11-27 1994-11-16 Ind Y Fundiciones Iglesias S A Mejoras introducidas en los dispositivos reguladores de la inclinacion de respaldos de asientos de oficina y similares.
EP0549538A1 (fr) * 1991-12-20 1993-06-30 CO.FE.MO. S.p.A. Support central pour régler l'inclinaison d'un siège oscillant
US5447357A (en) * 1992-08-21 1995-09-05 Dauphin Entwicklungs- U. Beteiligungs-Gmbh Chair with inclinable seat
WO1994009682A1 (fr) * 1992-10-23 1994-05-11 Doerner Products Ltd. Frein unitaire pour mecanisme d'inclinaison d'une chaise
US5356200A (en) * 1992-10-23 1994-10-18 Doerner Products Ltd. Unitary brake for a chair tilt mechanism
WO1999009861A1 (fr) * 1997-08-25 1999-03-04 Sylve Moheim Chaise de travail
WO2003032779A1 (fr) * 2001-10-13 2003-04-24 Voelkle Rolf Meuble servant de siege, en particulier chaise pivotante de bureau

Also Published As

Publication number Publication date
CA2014777A1 (fr) 1990-10-27
AU5374990A (en) 1990-11-01

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