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
  • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs

Definitions

• the invention relates to a synchronous mechanism for a correlated seat-backrest movement of an office chair, with a placeable on a chair column base support, a seat support and a backrest support.
• synchronous mechanism is understood to mean assemblies in the seat substructure of an office chair which provide kinematics which are coupled to one another and provide a specific relative movement of the seat and backrest
• the backrest support which extends in a conventional manner from the actual synchronizing mechanism to the rear, carries on an upwardly extending arm, the backrest of the office chair.Seat carrier and backrest support are usually coupled so articulated that a pivoting movement of the backrest to the rear - like can be caused for example by a leaning of the chair user to the backrest - induced a lowering movement of the rear edge of the seat down.
• An object of the present invention is to provide a synchronous mechanism in which a setting of a spring force for changing the "pivoting resistance" of the backrest is not required.
• a synchronous mechanism according to claim 1.
• the pivotable about a transverse axis backrest support on the one hand with the base support and on the other hand with the rear end portion of the seat support is pivotally connected such that a pivoting movement of the back to the rear induces a lifting movement of the rear portion of the seat support.
• the seat support is connected to the base support such that a lifting movement of the front portion of the seat support takes place.
• a basic idea of the invention is that the user of the office chair "raises" himself by stressing the backrest upwards
• Adjustment mechanisms (worm gears, gears, threaded rods, etc.) are not required. This considerably reduces the manufacturing costs of the synchronous mechanism. At the same time, the reliability increases.
• the seat support is not only raised in its rear region, but at the same time also takes place a lifting of the front portion of the seat support, takes place synchronously carrying the seat in a defined relationship to the back to the rear top.
• the opening angle of the backrest can be compared to in the prior art be very large known solutions. Thus, extreme supine positions are possible.
• the office chair has a seat which is configured in such a way that, when the backrest is pivoted into a rear position, a user makes a movement that tracks the movement of the backrest, the so-called "shirt pull-out effect" can also be prevented in a particularly effective manner.
• the lever geometry required for the "self-adjusting" mechanism of the present invention is preferably achieved in that the pivot axis of the connection of the backrest support is arranged with the base support in the chair longitudinal direction behind the hinge axis of the connection of the backrest support to the seat support.
• a device for changing the working area can be provided.
• the seat support spring element which is connected on the one hand with the seat support and on the other hand with a transverse bearing axis, which is connected to the base support.
• the bearing axis is eccentric, so that by a rotation of the bearing axis by the user, a displacement of the axial center and thus a change in the spring suspension, so that preferably at least two spring force ranges ("hard” / "soft”) can be adjusted.
• FIG. 1 is a perspective view of the synchronous mechanism obliquely from behind
• FIG. 2 is a side view of the synchronous mechanism in section
• Fig. 3 is a perspective view of the synchronous mechanism from the top rear
• Fig. 4 is a plan view of the synchronous mechanism in
• the synchronous mechanism has a base support 1, which by means of a cone seat 2 on the upper end of a
• the synchronous mechanism comprises a substantially frame-shaped seat support 3 (see Fig. 3) and a fork-shaped in plan view backrest support 4, the cheeks 5, 6 are arranged on both sides of the base support 1 , In all figures, the basic position is shown, in which the backrest support 4 assumes a substantially vertical position.
• On the seat support 3 is one with a padded
• the seat 7 mounted.
• the assembly is done using not shown fasteners in the usual way.
• the seat 7 is fixedly mounted on the seat support 3, so that a movement of the seat support 3 at the same time has a corresponding movement of the seat 7 result.
• a backrest On the backrest support 4, a backrest, not shown, is attached, which is height adjustable in modern office chairs.
• the backrest can also be integrally connected to the backrest support 4.
• the backrest support 4 is mounted on a pivot bearing 8 on the base support 1 such that the backrest support 4 is articulated via the pivot bearing 8 directly to the base support 1. This allows the
• Backrest support 4 are pivoted to the backrest about the pivot axis 9 extending through the pivot bearing 8 in the pivoting direction S, cf. Fig. 2.
• the pivot bearing 8 is formed in front of the front end 10 of the cheek 5, 6.
• the backrest support 4 is connected to the front end 10 of the cheek 5, 6 via a joint 11 with the seat support 3 at its rear end region 12.
• a pivoting about the hinge axis 13 of the joint 11 takes place.
• the pivot axis 9 of the connection of the backrest support 4 with the base support 1 is seen in the chair longitudinal direction 14 behind the hinge axis 13 of the connection of the backrest support 4 with the seat support 3.
• the hinge axis 13 of the connection of the backrest support 4 with the seat support 3 is above the position of the pivot axis 9 of the connection of the backrest support 4 to the base support 1.
• the base support 1 comprises two in the direction
• the upholstery 20 of the seat see in particular Fig. 2, consists of molded foam. It is in two different, arranged in the seat longitudinal direction 14 in a row
• the front seating area 21, which makes up about 30% to 40% of the total length of the upholstery 20 is provided with a "normal" upholstery thickness, while the rear seating area (between 70% and 60%).
• the cushion thickness of the rear seating area 22 is increased by at least 20 mm from the pad thickness of the front seating area 21.
• the Art and manner of transition from the front seat 21 to the rear seat 22 is preferably very soft and flowing and executed without edges. Particularly good results were achieved with a transition region in the form of an elongated lying S.
• the transition from the front seat 21 to the rear seat 22 is positioned so that the user essentially loads the front seat 21 in a normal ("average") sitting posture
• the foam is preferably free in the direction of the rear seat surface end 23 in order to be able to expand to the rear.
• an open design of the upholstery 20, without rearward limiting elements, is preferred.
• padding is understood to mean any elastic configuration of the seat, whichever
• molded foams are basically any other elastic materials used, such as spring packs or combinations of materials, such as foam in conjunction with silicone pads. Also, for example, the use of two-zone foam is possible.
• the hardness of the "swivel resistance" of the backrest can be changed in the embodiment shown in two stages from “hard” to “soft.”
• a substantially horizontally seated in the seat support 3 tension spring 24 is provided with its front end 25 at the eccentric Bearing axle 19 and with its rear end 26 is connected to the seat support 3.
• a laterally arranged actuating element 27 see Fig. 4
• the bearing axle 19 can be rotated about its axis from a first position to a second position 4, the rotation of the bearing shaft 19 thus also shifts the position of the front fixing of the tension spring 24.
• the pretensioning of the tension spring 24 changes accordingly. Accordingly, the position of the bearing axis 19 is more or less hard
• the number of tension springs 24 is not limited to one, depending on the version ngsform further, parallel tension springs 24 can be used.
• Backrest inclination provided an unspecified explained mechanism that can be operated by means of an operating lever 28.

Applications Claiming Priority (3)

Publications (1)

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ID=42224184

Family Applications (1)

Country Status (6)

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• 2005
  • 2005-04-28 DE DE102005020237A patent/DE102005020237B3/de not_active Expired - Fee Related
  • 2005-04-28 DE DE202005006960U patent/DE202005006960U1/de not_active Expired - Lifetime
• 2006
  • 2006-04-21 JP JP2008508122A patent/JP2008538945A/ja active Pending
  • 2006-04-21 WO PCT/EP2006/003655 patent/WO2006114239A1/de not_active Application Discontinuation
  • 2006-04-21 CN CNA2006800143704A patent/CN101166444A/zh active Pending
  • 2006-04-21 EP EP06742628A patent/EP1874162A1/de active Pending
• 2007
  • 2007-10-29 US US11/926,618 patent/US20080272638A1/en not_active Abandoned

Non-Patent Citations (1)

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