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
  • A47C1/03277—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf 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
  • A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers
• • 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
  • A47C7/02—Seat parts
  • A47C7/024—Seat parts with double seats

Definitions

• the invention relates to a chair with a seat support, a seat plate held pivotably thereon, a spring fixed to the seat support, which resiliently positions a seat back essentially perpendicular to the seat plate and on which the seat plate is supported with its free end.
• springs are used to support seat plates and backrests, which do not allow a fine adjustment of the forces required for the backrest inclination and for the seat plate inclination, either because gas pressure springs are used which only allow a linear increase in the spring force and at a certain point of the Attack mechanics, or because metallic belt springs are used, the spring characteristics of which are the same over the entire length. If different spring characteristics are desired when the chair is tilted, complicated mechanisms, for example toggle levers, must be used.
• the spring is designed as a band spring made of a fiber-reinforced composite material, which extends from its clamping point on the seat support below the seat plate essentially horizontally and at the rear end of the seat plate essentially vertically upwards leading extends, and that the stiffness of the spring varies in regions over its length.
• a fiber-reinforced composite spring has the advantage that it is a simple and very light component that can exert very large holding forces in a small volume.
• the rigidity of the spring, and thus the flexural rigidity can be set differently in some areas, so that, for example, other forces in the support area of the seat plate lead to the same deformation as in the area of the seat back .
• This enables the required spring forces for the individual parts of the chair to be individually matched when only a single spring is used.
• the spring is of different widths over its length and thus has areas of different stiffness, since wider areas have a greater stiffness.
• the spring can have a different thickness over its length and thus have regions of different rigidity.
• the spring has a multi-layer design, on the one hand this allows different stiffnesses to be achieved in different layers, on the other hand it prevents the spring from giving in suddenly in the event of an overload, which could lead to breakage.
• the spring runs essentially rectilinearly at the clamping point, then essentially in one arcuate part that extends over more than 90 ", and that this is followed by a slightly counter-curved area, which in turn merges into a straight area, on which the seat back is held. It has been shown that such a shape
• the spring on the one hand has only a small space requirement, but on the other hand shows the desired deformation and movement characteristics, so that both the seat plate movement and the backrest movement can be coordinated in the desired manner.
• the strength values of the spring are selected so that the direction of the free end in the unloaded and in the maximum loaded state differs by approximately 15 to 19 ", preferably by 18 °.
• the spring consists of glass fiber reinforced plastic, but in principle it would also be possible, for example, to use a multi-layer wooden spring, the layers of which at least in regions consist of different types of wood.
• the seat plate is divided into two and the front part is pivotally articulated on the seat support, if both seat plate parts are pivotably connected to one another and if the front and rear seat plate parts are each supported by a support on the spring, preferably the support of the front seat panel part is arranged on the rear edge.
• this results in an inevitable change in the inclination of the front seat part when the user leans back and at the same time there is a greater inclination of the rear seat part which forms a support wedge as long as the user leans forward and which is pivoted into the plane of the front seat part when the user leans back.
• the seat plate is divided into two and the front part is rigidly connected to the seat support, that the rear seat plate part is pivotally connected to the front seat plate part and is supported on the spring via a support.
• the rear seat plate part is pivotably arranged and is moved by the spring, while the front seat plate part remains unchanged. This is a simplified design with less design effort.
• the seat plate is formed in one piece and is supported on the spring via a support.
• the entire seat plate is pivotable and tilts in accordance with the leaning back of the user.
• Fig. 1 is a longitudinal sectional view of the constructive
• Figure 2 is a view of the chair of Figure 1 in the reclined position
• FIG. 3 shows a schematic side view of the chair of FIG. 1 with different spring positions and with representations of the cross section of the spring at different positions in the spring length;
• FIG. 4 shows a view similar to FIG. 1 in a further preferred exemplary embodiment of a chair with a front, non-pivotable seat plate part and a rear, pivotable seat plate part and
• Fig. 5 is a view similar to Fig. 1 in a further preferred embodiment with a one-piece seat plate.
• the chair shown in the drawing has a seat support 1 which is rotatably held on a foot (not shown) and which ends at its upper end in an arm 2 which runs essentially horizontally.
• a band spring 4 On the front part of the arm 2, one end of a band spring 4 is rigidly clamped in a horizontal holder 3 and is held immovably in the holder 3 relative to the seat support 1 over a certain length.
• the band spring 4 extends in the area of the seat support 1 parallel to its upper side and, in the undeformed state, rests against an upper, horizontal stop surface 5 at the rear end of the seat support 1.
• the band spring 4 After leaving the seat support 1, the band spring 4 is bent upward in a substantially circular arc, the bending angle slightly exceeding 90 °, for example by 10 °.
• This circular arc region 6 is adjoined by a region 7 which extends essentially vertically upward and is slightly curved in the opposite direction, on which a backrest 18 which is only shown in dash-dotted lines in FIG. 3 is held.
• the band spring 4 consists of a fiber composite material, for example of glass fiber reinforced plastic or of wood.
• the ribbon spring is preferably constructed in several layers, the different layers in particular having different fiber contents.
• the band spring can be a laminate of thin layers of different types of wood, the wood types of the individual layers also being able to change over the length of the band spring.
• the stiffness of the band spring is designed differently in the longitudinal direction.
• the width of the band spring can be different, as is clear from the illustration in FIG. 3, at the same time or alternatively the thickness of the band spring can be selected differently (FIG. 3). In both cases, this results in a different cross section of the band spring in different areas along the band spring.
• the fiber content in the longitudinal direction can be different, and different fiber orientations can also be used. Both effects also lead to different stiffnesses along the band spring.
• the front part 8 of a two-part seat plate 9 is pivotally mounted on the seat support 1 in the area of the holder 3, which is supported on the band spring 4 by a support 10 on its rear edge.
• the support 10 projects through a recess 11 in the stop surface 5.
• the rear part 12 of the seat plate 9 is pivotally articulated, which is also supported on the band spring 4 via a further support 13.
• the dimensions are chosen so that when the chair is not under load, the front part 8 of the seat plate 9 is pivoted a little upwards relative to the upper edge of the seat support 1, while the rear part 12 with the front part 8 makes an angle of the order of between 12 and 16 ° occupies, for example 14 °.
• the band spring is completely bent backwards, on the one hand the rear part 12 is pivoted relative to the front part 8 such that both parts 8 and 12 lie in one plane, while also the rear edge of the front part 8 and thus the front edge of the rear part 12 can be reduced slightly (FIG. 2).
• the band spring 4 receives a curvature opposite to the circular arc region 6, so that the lowering of the supports 10 and 13 is very different; the front support 10 is lowered much less than the rear support 13.
• the strength of the deformation of the band spring in the different areas along the band spring can be adjusted by a suitable choice of materials in the manner indicated, so that chairs with different deformation characteristics can be easily produced, which differ only in the choice of the band spring. It is also easily possible to replace this band spring if a different chair characteristic is required becomes. For example, in chairs for typists, it may be desirable that the recline can only be done against a relatively large resistance, while in the case of conference chairs, etc., recline is possible even with relatively low forces. Nevertheless, the inclination characteristic of the seat plate can be chosen to be the same, for example, if the stiffness properties in the front area of the band spring are the same.
• the front part 8 of the seat plate 9 is rigidly connected to the seat support 1, and the front support 10 is also missing. In this way, only the rear part 12 of the seat plate is 9 designed pivotable, but the rest of the chair is constructed the same.
• the seat plate 9 is formed in one piece, this one-piece seat plate 9 is supported only on the band spring 4 via a support 10, one is therefore missing second support 13.
• the entire seat plate is pivoted with the deformation of the band spring, there is no different pivoting in the front and in the rear part of the seat plate. Otherwise, the chair is constructed in the same way as in the embodiment of FIGS. 1 and 2.

Landscapes

• Health & Medical Sciences (AREA)
• Dentistry (AREA)
• General Health & Medical Sciences (AREA)
• Chairs Characterized By Structure (AREA)
• Chair Legs, Seat Parts, And Backrests (AREA)
• Chairs For Special Purposes, Such As Reclining Chairs (AREA)

Priority Applications (2)

Applications Claiming Priority (3)

Publications (1)

Family

ID=41059670

Family Applications (2)

Family Applications After (1)

Country Status (4)

Cited By (1)

Families Citing this family (5)

Citations (7)

Family Cites Families (5)

• 1992
  • 1992-03-28 DE DE4210283A patent/DE4210283C1/de not_active Expired - Fee Related
  • 1992-03-28 DE DE4210282A patent/DE4210282C1/de not_active Expired - Fee Related
• 1993
  • 1993-03-18 WO PCT/EP1993/000638 patent/WO1993019644A1/de not_active Ceased
  • 1993-03-18 JP JP5517019A patent/JPH07505545A/ja active Pending
  • 1993-03-18 JP JP5517020A patent/JP2783913B2/ja not_active Expired - Lifetime
  • 1993-03-18 WO PCT/EP1993/000637 patent/WO1993019649A1/de not_active Ceased
  • 1993-03-18 EP EP93921729A patent/EP0634901A1/de not_active Withdrawn
  • 1993-03-18 EP EP93921730A patent/EP0632701A1/de not_active Withdrawn

Patent Citations (7)

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