EP0298928A2 - Stuhl mit nach vorn neigbarem Sitz - Google Patents

Stuhl mit nach vorn neigbarem Sitz Download PDF

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Publication number
EP0298928A2
EP0298928A2 EP88830278A EP88830278A EP0298928A2 EP 0298928 A2 EP0298928 A2 EP 0298928A2 EP 88830278 A EP88830278 A EP 88830278A EP 88830278 A EP88830278 A EP 88830278A EP 0298928 A2 EP0298928 A2 EP 0298928A2
Authority
EP
European Patent Office
Prior art keywords
seat
chair
plate
cup
tie rod
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Withdrawn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
EP88830278A
Other languages
English (en)
French (fr)
Other versions
EP0298928A3 (de
Inventor
Mauro Monesi
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.)
Castelli SpA
Original Assignee
Castelli 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 Castelli SpA filed Critical Castelli SpA
Publication of EP0298928A2 publication Critical patent/EP0298928A2/de
Publication of EP0298928A3 publication Critical patent/EP0298928A3/de
Withdrawn legal-status Critical Current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
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
    • A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting chairs
    • 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
    • A47C7/443—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs
    • 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
    • A47C7/443—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs
    • A47C7/444—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs of torsion type

Definitions

  • the present invention relates to chairs of the type comprising a support structure, a seat mounted on the support structure so that it can pivot between a position of normal use and a forwardly-inclined working position, and resilient means which bias the seat into its position of normal use.
  • the object of the present invention is to provide a chair of the aforementioned type with a structure which is simple and convenient in use.
  • the main characteristic of the chair according to the invention lies in the fact that the support structure of the chair includes an upper cup-shaped support closed at the top by a plate which is fixed to the seat and is articulated to the cup-shaped support, in that the plate and the cup-shaped support have respective stop surfaces which are in contact with each other in the position of normal use of the seat, and in that the resilient means are constituted by a helical compression spring having its upper end in contact with a wall of the cup-shaped support and its lower end in contact with a bearing ring associated with a tie rod which is movable with the plate fixed to the seat.
  • the tie rod passes through apertures formed in the plate and the wall of the cup-shaped support and has an upper T-shaped head housed and resting in a seat formed in the plate which is fixed to the seat.
  • the load of the helical spring is preferably adjustable by means of a knob incorporating a nut screwed onto a threaded portion of the tie rod.
  • the bearing ring for the lower end of the helical spring is preferably constituted by an axial ball bearing interposed between the spring and the knob.
  • the assembly constituted by the tie rod, the knob, the ball bearing and the helical spring can be fitted as a unit by inserting the T-shaped head of the tie rod through the aperture in the plate from below and resting it in its seat in the plate after the tie rod has been rotated through 90°.
  • the chair according to the invention has a backrest which is connected to the seat by means of a double articulation constituted on each side of the chair by three mutually-articulated sheet-metal channels fixed to the seat, the backrest and an intermediate connecting element between the seat and the backrest, respectively.
  • a pin spring is associated with each articulation and has its two opposite arms in contact with the adjacent articulation channels.
  • the chair according to the invention may be provided with armrests by the provision of a cross member for supporting the armrests, which is mounted between the seat and the plate.
  • the chair also lends itself to being transformed easily into a chair with fixed legs, with or without armrests, by the replacement of the cup-shaped support and the associated plate with cross members for connecting the legs and the armrests.
  • Figures 1 and 2 show an office chair, generally indicated 1, comprising a seat 2 and a backrest 3 carried by a support structure 4.
  • the backrest 3 is connected to the seat 2 by means of an intermediate element 5 which is articulated to the seat 2 about a horizontal transverse axis 6 and to the backrest 3 about a horizontal transverse axis 7.
  • the support structure 4 has a single supporting column 8 whose base is provided with a plurality of spokes 9 having casters 10 at their ends.
  • the support column 8 incoporates, in known manner, a gas spring whose movable rod is indicated 11.
  • the structure of the seat 2 is articulated to a support 12 about a horizontal transverse axis 13.
  • the support 12 is fixed to the upper end of the rod 11, is made of sheet metal, and is essentially cup-shaped. It includes a base wall 14, a front wall 15, a rear wall 16 and two side walls 17 (see Figures 4 and 7).
  • the front wall 15 and the rear wall 16 are interconnected in the central region of the support by a wall 18.
  • the wall 18 has a front portion 18a which is contact with the corresponding part of the wall 15 and which forms a tubular seat 18b at its upper end for housing the pin of the articulation 13.
  • the wall 18 also includes a base portion 18c which is arranged parallel to and spaced from the base wall 14, as well as a rear part 18d which has a rectangular aperture 19 formed in a recessed circular-shaped region of the wall.
  • the base portion 18c of the wall 18 is also connected to the side walls 17 by means of two further walls 20, each including a vertical part 20a which rises from the base wall 18 and an essentially horizontal part 20b which extends from the upper end of the wall 20a to the respective side wall 17.
  • a bush 21 is mounted between the base wall 14 of the cup-shaped support 12 and the wall 18c and, in its turn, is firmly fixed to the upper end of the movable rod 11 of the gas spring.
  • the tubular seat 18b houses the central part of an articulation pin 22 whose ends are housed in two bushes 23 forming part of a plate 24.
  • the plate 24 has an essentially rectangular, slightly arcuate configuration with its concavity facing upwards, so as to fit the shape of the lower surface of the seat 2 (see also Figure 5).
  • the plate 24 has four holes 25 adjacent its corners for the engagement of screws 26 (Figure 5) for fixing it to the lower wall 70 of the seat 2.
  • the plate 24 has a recessed region, indicated 24a, intermediate its front edge and its rear edge.
  • the part 24a is in contact with the two walls 20b of the support 12 when the seat is in its position of normal use (see Figures 3 and 4).
  • the side walls 17 of the cup-shaped support 12 have four holes 28 for the passage of the heads of the screws 26.
  • the plate 24 has a recessed portion 32 in its rear part, in which a rectangular aperture 29 is formed.
  • a tie rod, indicated 30, is disposed through the apertures 29 and 19 and has an upper T-shaped head 31 housed and resting in the seat 32 of the plate 24.
  • the rectangular apertures 19 and 29 enable the tie rod 30 to be inserted through the apertures from below, after which the head 31 can be made to bear on the seat 32 by rotation of the tie rod 30 through 90° about its own axis.
  • the opposite end of the tie rod 30 has a threaded portion 32a onto which a nut 33 is screwed.
  • the nut 33 is incorporated in the plastics body of a knob 34 having a cup-shaped end part closed by a cover 35.
  • a helical spring 36 is associated with the tie rod 30 and has its upper end in contact with the lower surface of the wall 18d.
  • This wall as already indicated, has a circular recessed part in correspondence with the aperture 19, which serves to keep the upper end of the spring 36 aligned with the axis of the tie rod 30.
  • the lower end of the spring 36 acts against the knob 34 with the interposition of an axial ball bearing 37.
  • the assembly constituted by the tie rod 30, the spring 36, the bearing 37 and the knob 34 can be fitted as a unit into the cup-shaped support by the insertion of the head of the tie rod from below, as described above.
  • the upper end of the movable rod 11 of the gas spring is provided with a control button 38 which, when pushed, enables the height of the chair to be adjusted.
  • the control button 38 can be operated by means of a lever 39 ( Figure 5) which is pivotably mounted on one of the two side walls 17 by means of a ring 40 of elastomeric material.
  • the lever 39 has an operative end 41 which acts on the button 38 and a handle 42 at its opposite end. A raising of the handle 42 in the direction of the arrow A shown in Figure 4 causes a corresponding lowering of its operative end 41 and the operation of the button 38.
  • the structure of the seat 2 includes a sheet-metal panel 70 to which is fixed a padding of expanded plastics material 71 provided with a cloth cover 72 whose peripheral edge is anchored to the panel 70.
  • the structure of the backrest is similar and has a sheet-metal panel 73, a padding of expanded plastics material 74 and a cloth cover 75.
  • the intermediate element 5 includes a rear sheet-metal panel 76 fixed along the periphery of a front panel 77 of plastics material. In the region to which the plate 24 is fixed, the panel 70 of the seat has a corrugated metal reinforcing plate 78 on its inner side.
  • the two articulations 6 and 7 between the seat and the backrest of the chair are formed, on each side of the chair, by three sheet-metal channels 43, 44 and 45 articulated to each other by pins 46 and 47.
  • a pin spring 48 is associated with the pin 46, and its two end arms are in contact with the channel 43 and the channel 44 respectively.
  • the three channels are arranged within the backrest 3, the intermediate element 5 and the seat 2, respectively.
  • the channels 43 and 45 in the backrest 3 and the seat 2 are arranged in cavities 79 and 80 ( Figures 3 and 5) defined between channel-shaped portions of the respective sheet-metal panels 73 and 70 and the padding 74 and 71. As illustrated in Figure 10, the channels 43, 44 and 45 are fixed to the respective panels by means of rivets 52.
  • the chair according to the invention is normally in the position of use illustrated in continuous outline in Figure 2.
  • the spring 36 situated in the cup-shaped support 12 pushes the tie rod 30 downwards.
  • the upper head 31 of the tie rod therefore keeps the plate 24 in the stop position against the walls 20b of the cup-shaped support 12.
  • a seated person can make the seat 2 pivot forwards about the axis 13 by moving his weight to the front part of the seat, so as to dispose the chair in the position indicated A in Figure 2.
  • This position is suitable for working with typewriters, display terminals and the like.
  • the forward pivoting of the seat 2 causes a corresponding pivoting of the plate 24 relative to the cup-shaped support 12, about the articulation axis 13.
  • the pivoting of the plate 24 also causes the tie rod 30 to be raised, thus compressing the spring 36.
  • the spring 36 returns the latter to the position of normal use illustrated in continuous outline in Figure 2.
  • the load of the spring 36 can be adjusted by the operation of the knob 34, so as to change the axial position of the nut 33 and the axial bearing 37. The latter enables rotation of the knob 34 relative to the lower end of the helical spring 36. The user can thus adjust the chair so as to obtain the required degree of reaction when the seat is pivoted forwardly.
  • the operator may also tilt the backrest of the chair backwards from the position of normal use illustrated in continuous outline in Figure 2, by pushing his body against it until it reaches the position indicated B in Figure 2. This position is reached by making use of the angular travel permitted by the articulations 6 and 7. When the pressure on the backrest stops, the latter returns to its position of normal use under the action of the pin springs 48 and 49.
  • Figures 12 and 13 show a variant of the chair according to the invention, which differs from that illustrated in Figures 1-11 in that it includes two armrests 82 which are formed by the end portions of a single tubular sheet-metal element 83.
  • This element includes a central cross member 84 which is fixed by means of bolts 85 ( Figure 13) to the sheet-metal panel 70 of the seat 2 and is situated in the recessed part of the plate 24.
  • Figures 15-17 show a further variant which differs from that of Figures 12 and 13 in that the cup-shaped support 12 with the plate 24 and the associated support structure 4 is replaced by two pairs of legs 86.
  • Each pair of legs 86 is formed by a single flattened tubular element 87.
  • This element includes a central cross member 88 which is fixed by means of bolts 89 to the panel 70 of the seat 72.
  • the two central cross members 88 are connected by a bridge element 90 which is welded to them and, together with the cross member 84, is fixed to the panel 70 by means of bolts 91.
  • Figure 14 shows a variant with fixed legs but without armrests.

Landscapes

  • Chairs Characterized By Structure (AREA)
EP88830278A 1987-07-09 1988-06-28 Stuhl mit nach vorn neigbarem Sitz Withdrawn EP0298928A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT5351287 1987-07-09
IT5351287 1987-07-09

Publications (2)

Publication Number Publication Date
EP0298928A2 true EP0298928A2 (de) 1989-01-11
EP0298928A3 EP0298928A3 (de) 1989-08-16

Family

ID=11283335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88830278A Withdrawn EP0298928A3 (de) 1987-07-09 1988-06-28 Stuhl mit nach vorn neigbarem Sitz

Country Status (2)

Country Link
EP (1) EP0298928A3 (de)
JP (1) JPS6427511A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3907251A1 (de) * 1989-03-07 1990-09-13 Konrad Neumueller Vorrichtung zum verhindern unbeabsichtigter bewegungsablaeufen bei mindestens einer um eine achse kippbaren flaeche, wie rueckenlehne von stuehlen, tuerklappe an schraenken u.a.
WO2013029575A1 (en) 2011-08-29 2013-03-07 Sorm Michal Seating device with a tilting seat part
US11109683B2 (en) 2019-02-21 2021-09-07 Steelcase Inc. Body support assembly and method for the use and assembly thereof
US11253077B2 (en) * 2016-12-21 2022-02-22 Kokuyo Co., Ltd. Chair with return force mechanism
US11259637B2 (en) 2015-04-13 2022-03-01 Steelcase Inc. Seating arrangement
US11324325B2 (en) 2015-04-13 2022-05-10 Steelcase Inc. Seating arrangement
US11357329B2 (en) 2019-12-13 2022-06-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11963621B2 (en) 2015-04-13 2024-04-23 Steelcase Inc. Seating arrangement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0415445U (de) * 1990-05-25 1992-02-07

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656805A (en) * 1969-09-15 1972-04-18 Interroyal Corp Chair control and support
FR2390131A1 (fr) * 1977-05-09 1978-12-08 Center Design Res & Dev Support de siege inclinable vers l'avant
FR2443226A1 (fr) * 1978-12-04 1980-07-04 Center Design Res & Dev Chaise
GB2076283A (en) * 1980-04-28 1981-12-02 Center Design Res & Dev Chair seat mounting
EP0079530A2 (de) * 1981-11-17 1983-05-25 SUSPA COMPART Aktiengesellschaft Arretierbare Wippvorrichtung für Sitzteile von Sitzmöbeln
EP0107627A1 (de) * 1982-10-22 1984-05-02 Castelli S.P.A. Stuhl mit einer aus mehreren gelenkten Segmenten bestehender Rückenlehne

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656805A (en) * 1969-09-15 1972-04-18 Interroyal Corp Chair control and support
FR2390131A1 (fr) * 1977-05-09 1978-12-08 Center Design Res & Dev Support de siege inclinable vers l'avant
FR2443226A1 (fr) * 1978-12-04 1980-07-04 Center Design Res & Dev Chaise
GB2076283A (en) * 1980-04-28 1981-12-02 Center Design Res & Dev Chair seat mounting
EP0079530A2 (de) * 1981-11-17 1983-05-25 SUSPA COMPART Aktiengesellschaft Arretierbare Wippvorrichtung für Sitzteile von Sitzmöbeln
EP0107627A1 (de) * 1982-10-22 1984-05-02 Castelli S.P.A. Stuhl mit einer aus mehreren gelenkten Segmenten bestehender Rückenlehne

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3907251A1 (de) * 1989-03-07 1990-09-13 Konrad Neumueller Vorrichtung zum verhindern unbeabsichtigter bewegungsablaeufen bei mindestens einer um eine achse kippbaren flaeche, wie rueckenlehne von stuehlen, tuerklappe an schraenken u.a.
WO2013029575A1 (en) 2011-08-29 2013-03-07 Sorm Michal Seating device with a tilting seat part
US11259637B2 (en) 2015-04-13 2022-03-01 Steelcase Inc. Seating arrangement
US11324325B2 (en) 2015-04-13 2022-05-10 Steelcase Inc. Seating arrangement
US11963621B2 (en) 2015-04-13 2024-04-23 Steelcase Inc. Seating arrangement
US11253077B2 (en) * 2016-12-21 2022-02-22 Kokuyo Co., Ltd. Chair with return force mechanism
US11109683B2 (en) 2019-02-21 2021-09-07 Steelcase Inc. Body support assembly and method for the use and assembly thereof
US11357329B2 (en) 2019-12-13 2022-06-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11786039B2 (en) 2019-12-13 2023-10-17 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11805913B2 (en) 2019-12-13 2023-11-07 Steelcase Inc. Body support assembly and methods for the use and assembly thereof

Also Published As

Publication number Publication date
JPS6427511A (en) 1989-01-30
EP0298928A3 (de) 1989-08-16

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