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—Supports for the head or the back
  • A47C7/40—Supports for the head or the back for the back
  • A47C7/44—Supports for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
  • A47C7/446—Supports for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with fluid springs

Definitions

• the invention relates to a chair with a rigid seat support, a seat back arranged thereon via a support arm arranged below the seat support, rotatably mounted thereon and essentially horizontally extending support arm, and having a seat back which moves the seat back into the upright position Feather.
• Such a chair construction is known for example from the Swiss patent 524 982.
• the back of a chair is cushioned and is resiliently pushed backwards by the user when leaning back.
• the user's center of gravity moves to the rear so that the backrest is subjected to a higher pressing force.
• this is not taken into account sufficiently, so that the backrest seems to be easier to swivel back the further the user leans back. It is an object of the invention to design a chair of the generic type in such a way that this easier pivoting of the backrest is counteracted as the pivoting back increases.
• a toggle lever with one arm on the seat support and the other arm on the support arm is rotatably articulated at a distance from the bearing point of the support arm on the seat support and in that on the toggle lever in Distance to the articulation points on the seat support and on the support arm, the spring engages in a direction that counteracts the extension of the toggle lever.
• the support arm when the backrest is raised, the support arm is very close to the seat support, so the toggle lever arranged between the two is folded up.
• the support arm When the seat back is pivoted backwards, the support arm is pivoted downward relative to the seat support, that is to say it moves away from it, the toggle lever being moved into the extended position.
• the restoring force increases with the inclination of the seat back, since the force of the spring on the toggle lever counteracts the stretching of the toggle lever, which increases with increasing extension of the toggle lever.
• the spring acts essentially transversely to the longitudinal direction of the extended toggle lever, it is particularly advantageous if the spring engages the joint of the toggle lever.
• the spring can be fixed with its other end to the bearing point of the seat support.
• the spring is rotatably mounted with its other end on the support arm.
• This bearing point can be arranged both in front of and behind the articulation point of the toggle lever, it is only essential that the spring acts essentially transversely to the longitudinal direction of the extended toggle lever and applies a force counteracting the extension of the toggle lever.
• the spring is a gas pressure spring.
• Figure 1 a chair with the seat back in the erected position
• Figure 2 the chair of Figure 1 with the seat back in the pivoted back position
• Figure 3 a view similar to Figure 1 with a
• the chair shown in the drawing comprises a column 1 leading to a foot (not shown), which at its upper end has a horizontal column rigidly connected to the column 1.
• bound seat support 2 carries.
• the seat support 2 is designed as a seat plate on which a seat cushion 3 is placed, but the seat support could also be designed as a separate part in the form of an arm or the like, which carries a seat plate which is movably mounted on it.
• the simplest design is chosen, since the design of the seat surface is not important for the present invention.
• the support arm 5 of a backrest 6 is mounted below the seat support 2 in the area of the column 1 on a bearing block 4 projecting downward from the seat support 2.
• This backrest 6 has at its lower end the support arm 5 which is initially bent approximately at right angles and which extends essentially parallel to the seat support, that is to say essentially horizontally, below the seat support 2 and finally with one upward at right angles protruding end piece 7 is rotatably mounted on the bearing block 4.
• a two-armed toggle lever 8 rotatably engages, which is rotatably mounted on the support arm 5 with its lower arm 9.
• the upper arm 10 is also rotatably mounted on the seat support 2, which carries a special bearing 11 for this purpose.
• a gas pressure spring 13 engages, the other end of which is articulated on the bearing block 4, in the present embodiment play concentrically with the articulation point of the support arm 5.
• the gas pressure spring can be pushed together by applying a substantially constant force, without external force being applied, the two parts of the gas pressure spring shift into an extended position.
• the articulation point of the support arm 5 and the gas pressure spring 13 on the bearing block 4 is arranged approximately at the same height as the articulation point 12 when the backrest is upright (FIG. 1), the articulation points of the toggle lever 8 on the seat support 2 and on the support arm 5 lie one above the other, but not unrelated things exactly vertically one above the other, they can also be slightly offset to one side.
• the gas pressure spring 13 essentially extends horizontally, while the toggle lever 8 extends essentially vertically, ie the line of action of the gas pressure spring extends approximately perpendicular to the direction of extension of the toggle lever.
• the gas pressure spring 13 is not attached to the supported by the bearing block 4, but supported on its own bearing block 14, which is located in the vicinity of the vertical bend of the support arm 5.
• the toggle lever is pivoted forward in the pivoted-in state, but in the same way as in the embodiment of FIG. 1, the gas pressure spring 13 counteracts the extension of the toggle lever 8.

Landscapes

• Chairs Characterized By Structure (AREA)
• Chairs For Special Purposes, Such As Reclining Chairs (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6417009

Family Applications (1)

Country Status (4)

Cited By (3)

Citations (3)

• 1990
  • 1990-10-25 DE DE19904033907 patent/DE4033907C1/de not_active Expired - Fee Related
• 1991
  • 1991-08-23 JP JP3514202A patent/JPH06501399A/ja active Pending
  • 1991-08-23 WO PCT/EP1991/001601 patent/WO1992007490A1/de not_active Application Discontinuation
  • 1991-08-23 EP EP19910914657 patent/EP0554260A1/de not_active Withdrawn

Patent Citations (3)

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