Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47C—CHAIRS; SOFAS; BEDS
  • A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
  • A47C31/12—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons
  • A47C31/126—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons for 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
• • 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

Definitions

• the present invention relates to a chair with a seat plate, which is supported by a central chair column or several chair legs, and with a backrest support, which extends under the seat plate backwards and behind the seat plate and carries a backrest, the seat plate near its front edge is pivotally mounted about a horizontally transverse first pivot axis, the seat plate being pivoted on the backrest support near its rear edge about a parallel second pivot axis, the backrest carrier being pivotable on the central chair column about a third pivot axis running parallel to the first and second pivot axes or is articulated to the chair legs - and wherein a spring arrangement is provided which exerts an upward force on the seat plate and a forwardly directed force on the backrest.
• a chair of the type mentioned is known from DE 43 13 301 C2. It is specifically envisaged that on the underside of the seat plate in the front and rear area pairs are fixed downward supports, the lower ends of the front supports with the lower ends of downward, pivotally attached to the seat bracket and the lower ends the rear supports can be swiveled with the backrest support are bound and that the compression spring arrangement is arranged in the form of a coil spring between the seat plate and the seat support.
• a so-called synchronous mechanism is achieved, in which when the user of the chair leans back with loads on the rear part of the seat plate, the latter is lowered at the rear and at the same time the backrest is pivoted backwards, this pivoting taking place against the force of the spring.
• the swivel angle of the backrest is usually larger than the swivel angle of the seat plate. The ratio of the swivel angles to each other is determined by the interacting lever lengths.
• a disadvantage of this known chair is that the preloading force of the backrest only depends on the strength of the compression spring arrangement and on the leverage established in the construction of the chair. Therefore, it is in no way possible to adapt the preload force of the backrest to different body weights of different users of the chair. It would be possible to influence the preloading force of the backrest by using an adjustable or prestressable compression spring arrangement, but for this the user of the chair would have to carry out the adjustment manually, which is an undesirably high effort, especially if a chair is used by different and differently heavy users , In addition, there is no guarantee that the user will actually find the appropriate setting, which can result in incorrect and possibly even harmful settings of the preload force of the backrest.
• the object of the present invention is therefore to create a chair of the type mentioned above which avoids the disadvantages set out and in which in particular an automatic adjustment of the preloading force of the backrest to users of the chair of different weights is achieved and in which the construction effort and especially the number of individual parts required should remain low.
• the seat plate when used by a user, is moved downward against the force of the spring arrangement according to the weight of the user, which inevitably leads to a corresponding increase in the Tension of the spring arrangement leads.
• the spring arrangement since the spring arrangement is supported on the backrest support, the increased tension of the spring arrangement exerts an increased lever torque on the backrest support, which leads to an increase in the preloading force of the backrest.
• a chair user with a higher body weight thus experiences increased support of his back through the backrest, as is desirable and ergonomically sensible.
• the seat plate When a lighter user sits on the chair, the seat plate assumes a higher position in which the spring arrangement is less tensioned; Correspondingly, there is also inevitably a lower preload force on the backrest, so that a light-weight user also experiences an appropriately lower support force by the backrest on his back in accordance with his lower body weight.
• the synchronous adjustment of the seat plate and backrest is retained in its entirety, so that the seat plate and the backrest are pivoted in a predetermined relationship to one another even when the seat position changes become.
• the chair is of a surprisingly simple construction, so that the manufacture of the chair is simple and inexpensive in relation to the functions provided.
• a separate seat support is no longer required, since the spring arrangement also carries the seat plate near its front edge and supports it so that it can pivot.
• the spring arrangement can be brought into the required shape simply by bending; a change in the spring force is easily possible by changing the material thickness of the spring steel rod or wire or by changing the length of the spring legs.
• the backrest support has an extension pointing beyond the third pivot axis and forming a lever arm, and that the spring is supported on the backrest support extension and on this exerts a downward force.
• This design of the mechanics required for the chair movements also offers an attractive appearance of the chair and is particularly suitable for use on stackable chairs.
• the spring arrangement is formed by two springs which are U-shaped in plan view and which are arranged next to one another in a mirror-symmetrical manner under the seat plate, the first U-spring leg, in each case, being clamped backwards on the chair column or the chair legs, the U -Bend of the spring forms the spring section connected to the seat plate for the first pivot axis and wherein the second U-spring leg is supported on the extension of the backrest support.
• These U-shaped springs are particularly special flat and can be easily manufactured as bent parts. The use of two springs ensures a good distribution of the forces and prevents undesired lateral tilting movements of the seat plate.
• a further development of the embodiment set out above is that the two U-shaped springs forming the spring arrangement are combined to form a one-piece spring which is W-shaped in plan view and which is arranged symmetrically to the longitudinal central axis of the seat plate below the latter. This reduces the manufacturing and assembly work involved in the manufacture of the chair.
• a clamping bracket preferably a clamping sleeve
• the setting of the spring is very simple and at the same time very unobtrusive.
• An alternative embodiment of the chair provides that the backrest support ends at the third pivot axis and that the spring is supported behind the third pivot axis on the backrest support and exerts an upward force thereon.
• the functions explained above are also achieved with this embodiment of the chair, wherein a spring arrangement which is changed with regard to its direction of action can be used here. This increases the technical freedom in the manufacture of the chair and in particular in the selection of the springs to be used.
• the spring arrangement is formed by two leg springs, each with a coiled spring body and two spring legs, the springs next to one another in mirror symmetry under the seat plate. te are arranged, with the spring body surrounding the third pivot axis, the first spring leg being supported forwardly on the seat plate and at its front end forming the spring section connected to the seat plate for the first pivot axis and with the second spring leg in each case is supported at the back on the backrest support.
• Leg springs need a little more height, but their spring characteristics can be influenced and adjusted more easily. In addition, they generally allow longer spring travel and thus greater comfort in the chair.
• the two leg springs forming the spring arrangement are advantageously combined to form a one-piece double leg spring which is arranged below the seat plate symmetrically to the longitudinal center axis. This again simplifies the manufacture and assembly of the chair mechanics.
• a stop preferably a stop plate, is firmly attached to the chair column or the chair legs for each first spring leg. This defines a defined upper end position of the seat plate when the chair is not in use. An undesirably wide lifting of the seat plate when there is no load is excluded.
• At least two front bearing supports on the underside of the seat plate, through which the first pivot axis is locked. runs, and at least two rear bearing supports, through which the second pivot axis runs, are attached.
• the forces that occur when using the chair are so favorably introduced into and derived from the seat plate.
• a modified seat plate can be easily attached, which, together with an equally simple exchange of the attached backrest, enables modifications of the chair in a variety of forms.
• the invention provides that to form the third pivot axis under the seat plate is a stab- or rohrför-shaped bearing bolt which is fixedly connected to the chair column or chair legs and on which the backrest support is pivotally mounted.
• this bearing pin serves as a cross strut for the chair, which promotes its stability, especially when it is designed with four chair legs.
• the chair preferably has a combination of synchronous mechanism and weight-dependent backrest preload.
• the chair can alternatively be designed such that the articulation of the seat plate on the backrest support and the second, rear pivot axis are omitted, as a result of which the seat plate and the backrest support are unsynchronized, that is to say can be pivoted independently of one another.
• the technical changes required for this are limited to the omission of individual parts, in particular the rear bearing pin and the associated bearing supports.
• FIG. 1 shows a chair in a first embodiment as a conference chair, in a side view
• FIG. 2 shows the chair from FIG. 1 in a bottom view
• FIG. 3 shows the chair in a second embodiment as a conference chair, also in a side view
• Figure 4 shows the chair of Figure 3 in a bottom view.
• FIG. 5 shows the chair in a third embodiment as an office swivel chair, in a partial side view
• Figure 6 shows the chair of Figure 5 in a bottom view.
• the chair 1 shown in FIG. 1 as the first exemplary embodiment has, as essential parts, a seat plate 2, a backrest support 4 with a backrest 4 ', four chair legs 5 and a spring arrangement 6.
• the chair legs 5 are each in one piece on the left and right as approximately U-shaped Arc executed, the U-legs form the legs 5.
• the spring arrangement here consists of a spring 6, which is formed by a bent spring steel rod.
• the spring 6 is approximately W-shaped in the bottom view, as will be described with reference to FIG. 2.
• Two lateral outer legs 62 of the spring 6 are fixed at their ends in clamping sleeves 56 which are firmly connected to the chair legs 5.
• the seat plate 2 is a plate which is stable in itself and which can be provided on the upper side with a cushion, not shown here.
• the seat plate 2 is connected to four front bearing supports 21 and two rear bearing supports 22.
• the bearing supports 21, 22 are arranged one behind the other in the side view shown in FIG. 1, so that only one of the bearing supports 21, 22 is visible in each case.
• the front bearing supports zen 21 are arranged near the left in the drawing front edge of the seat plate 2 and each have a bearing hole.
• a front section 61 of the spring 6 runs through the front bearing supports 21 and thus forms a first pivot axis 71 for the seat plate 2.
• the rear, second bearing supports 22 also each have a bearing hole through which a bearing pin 32 runs horizontally in the transverse direction of the chair.
• this second bearing pin 32 runs through the backrest support 4 and forms with it a swivel joint with a second swivel axis 72, which runs parallel to the first swivel axis 71.
• the backrest support 4 carrying the backrest 4 ' is made in one piece by an approximately right-angled profile, e.g. a tube formed.
• the backrest support 4 initially runs below the seat plate 2 to the rear and then turns upwards. At its upper end, the backrest support 4 is connected to the backrest 4 '.
• the first section of the backrest support 4, which runs under the seat plate 2, is pivotably mounted about a third pivot axis 73, which runs parallel to the other pivot axes 71, 72, by means of a bearing sleeve 33 'and a bearing bolt 33 which is firmly connected to the chair legs 5 , Furthermore, the backrest support 4 has an extension 41 pointing forward over the bearing pin 33. With its second spring leg 64 pointing backwards from the spring section 61, the spring 6 is supported on the upper side on the forward-pointing extension 41 of the first backrest support part 40.
• the spring 6 is preloaded such that on the one hand it exerts an upward preloading force on the seat plate 2 and on the other hand via the backrest support 4 on the backrest 4 ′ a forwardly directed preloading force exercises power.
• a movement of the seat plate 2 in the vertical direction relative to the chair legs 5 is possible in the chair 1, this vertical movement being able to take place both approximately linearly vertically and in the form of pivotings about the first, front pivot axis 71 or about the second, rear pivot axis 72 ,
• FIG. 1 shows the chair 1 in a relieved state, in which no forces are exerted by a user of the chair 1 on the seat plate 2 and on the backrest 4 '.
• the pivoting of the backrest support 4 towards the front is limited in this position by an invisible stop.
• the seat plate 2 moves - depending on the body weight of the user - more or less far down.
• the spring 6 is bent more downward in its section 61 and thereby receives a higher tension.
• the spring 6 with its spring leg 64 exerts a correspondingly greater downward force on the extension 41 of the backrest support part 40, which inevitably leads via lever action that the backrest 4 'receives a higher preload force to the front, that is to say the back of the user with a higher one Strength supports.
• the seat plate 2 is pressed down correspondingly less, as a result of which the spring 6 is also tensioned less and as a result the backrest 4 ′ then also experiences a lower preload force.
• the preloading force or supporting force of the backrest 4 'therefore automatically adapts to users of different weights.
• the chair 1 has a synchronous mechanism, which allows the position of the seat plate 2 and back backrest 4 'coupled to change.
• the seat plate 2 is lowered against the force of the spring 6 at the rear, with the backrest 4 'being pivoted backwards in a fixed swivel angle ratio via the lever action that occurs.
• the backrest 4 ′ can be mounted on the backrest support 4 such that it can be pivoted about a horizontally transverse axis, which enables a further improved adaptation of the backrest 4 ′ to different users of the chair 1.
• the bottom view of the chair 1 from FIG. 1 shown in FIG. 2 of the drawing illustrates the symmetrical arrangement of the mechanics of the chair 1 on both sides of the longitudinal central axis 20 of the seat plate 2, which is visible in the background.
• the backrest support 4 which carries the backrest 4 'at its rear end, which is the upper end in FIG.
• Extending transversely to the backrest support 4 are the two bearing bolts 32, 33 which run parallel to one another in the transverse direction of the chair 1 under its seat plate 2 and which form the second and third pivot axes 72, 73.
• the ends of the rear, shorter bearing pin 32 lie in the rear bearing supports 22, which are attached to the seat plate 2 on both sides of the backrest support 4; the ends of the central bearing pin 33, which extends over the entire width of the seat plate 2, are fixed to two lateral bearing plates 53 which are firmly connected to the chair legs 5.
• the backrest support 4 is mounted on the central bearing pin 33 by means of a bearing sleeve 33 'so that it can pivot about the pivot axis 73; in front of this bearing pin, ie below this in Figure 2, the extension 41 of the backrest Carrier 4.
• the spring 6 is supported with its central spring legs 64. With its two lateral outer spring legs 62, the spring 6 is held in the lateral clamping sleeves 56, which are firmly attached to the chair legs 5.
• the sections 61 of the spring 6 lying near the front edge of the seat plate 2, in the drawing below, run transverse to the axis 20 through the four front bearing supports 21 and form the first pivot axis 71.
• FIG. 2 clearly shows the very simple and clear construction of the mechanics of the chair 1, which results in simple manufacture and a compact size.
• the construction is both stable and low-wear.
• the chair 1 can be stacked to save space when not in use, which was previously only possible with simple chairs without synchronized mechanism and without automatic weight adjustment of the backrest force.
• FIGS. 3 and 4 of the drawing show, as a second exemplary embodiment, a further conference chair 1 which, in contrast to the chair according to FIGS. 1 and 2, is equipped with two springs 6 and with two backrest supports 4.
• This version of the chair 1 also comprises a stable seat plate 2, four front and rear bearing supports 21, 22 being provided on the underside of the seat plate 2 here.
• the chair legs 5 are rigidly connected to one another via the central bearing bolt 33 which forms a crossbeam and which at the same time forms the third pivot axis 73.
• There are also two rear bearing bolts 32 which are fixed with their ends in the associated rear bearing supports 22 and which form the second pivot axis 72.
• the backrest support 4 ends here on the central bearing pin 33 and is fastened, for example welded, to a bearing sleeve 33 'which is rotatably mounted on this bearing pin 33.
• the backrest supports 4 therefore do not have an extension projecting beyond the third pivot axis 73.
• the backrest supports 4 again carry the backrest 4 '.
• the backrest 4 'and the backrest support 4 are thus pivotally mounted about the bearing pin 33 and the third pivot axis 73, respectively.
• the coiled spring body 65 of the springs 6, which are leg springs here, is held on the center bearing pin 33 on the left and right outside next to the sleeve 33 '.
• Two first spring legs 62 each extend from the spring body 65 to the front and are bent there in the transverse direction of the seat plate 2 and guided through the front bearing supports 21. These sections 61 of the spring 6 thus also form the first pivot axis 71 here.
• Two second spring legs 64 each run backwards from the spring body 65 and are supported with their ends on the backrest support 4 behind the third pivot axis 73.
• the leg spring 6 is biased such that the first legs 62 exert a force on the seat plate 2 and the second legs 64 also exert a force on the backrest support 4.
• the movement of the seat plate 2 upwards is limited by two lateral stops 57 which are firmly connected to the chair legs 5 and against which the first spring legs 62 abut.
• the chair 1 according to FIGS. 3 and 4 behaves like the chair 1 according to FIGS. 1 and 2; here too there is an automatic adaptation of the preloading force of the backrest 4 'to the body weight of the user of the chair 1.
• the synchronous mechanism for the coupled pivoting of the seat plate 2 and backrest support 4 with the backrest 4' is also ensured in the chair 1 according to FIGS. 3 and 4 , Since the 3 and 4 below the seat plate 2 is very compact, the chair 1 can also be stacked for storage and transport purposes, resulting in a very space-saving arrangement.
• FIGS 5 and 6 of the drawing show an embodiment of the chair 1, in which it is designed as an office swivel chair, ie with a central chair column 5.
• the central chair column 5 has at its upper end a head piece 51 through which the middle, third bearing pin 33 runs.
• the backrest support 4 can be pivoted about this bearing pin 33, which forms the third pivot axis 73. At its upper, not visible end, the backrest support 4 again supports the backrest.
• the chair 1 according to FIG. 5 and FIG. 6 also comprises a seat plate 2 which has four front bearing supports 21 and two rear bearing supports 22 on the underside.
• a spring 6 belongs to the chair 1, which is designed here similarly to the example according to FIGS. 1 and 2.
• the spring 6, which is particularly illustrated in FIG. 6, is bent in a W-shape in view and is mirror-symmetrical to the longitudinal central axis 20 of the seat plate 2 arranged under this.
• the spring 6 has two front spring sections 61, which run in the transverse direction of the seat plate 2, which extend through the front bearing supports 21 and which form the first pivot axis 71.
• Two spring legs 62 extend laterally outwards from the spring sections 61 to the rear.
• the spring legs 62 are fixed in two lateral outer clamping sleeves 56.
• the clamping sleeves 56 are fixedly attached to the respective outer end of two wings 52, which in turn are firmly connected to the head piece 51 of the central chair column 5.
• Two inner spring legs 64 also extend rearward from the spring sections 61 and are integrally connected to one another in their end region. In this area, the spring legs 64 are supported on the top side on the extension 41 of the backrest support 4.
• the spring 6 is biased so that it exerts an upward force on the seat plate 2 and a downward force on the extension 41 of the backrest support 4. The downward force exerted on the extension 41 of the backrest support 4 preloads the backrest towards a user of the chair.
• the chair according to FIGS. 5 and 6 corresponds to the previously described exemplary embodiments according to FIGS. 1 to 4.
• an automatic adjustment of the preloading force of the backrest is achieved depending on the weight of the user of the chair 1.
• the mechanics below the seat plate 2 are very compact and only require a low overall height and only a few individual parts.

Landscapes

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

Applications Claiming Priority (3)

Publications (2)

Family

ID=7643928

Family Applications (1)

Country Status (7)

Families Citing this family (7)

Family Cites Families (16)

• 2000
  • 2000-05-27 DE DE10026531A patent/DE10026531C2/de not_active Expired - Fee Related
• 2001
  • 2001-05-18 CA CA002379873A patent/CA2379873C/fr not_active Expired - Fee Related
  • 2001-05-18 DE DE50102838T patent/DE50102838D1/de not_active Expired - Lifetime
  • 2001-05-18 EP EP01943400A patent/EP1209994B1/fr not_active Expired - Lifetime
  • 2001-05-18 WO PCT/EP2001/005692 patent/WO2001091613A1/fr active IP Right Grant
  • 2001-05-18 AT AT01943400T patent/ATE270833T1/de not_active IP Right Cessation
  • 2001-05-18 ES ES01943400T patent/ES2225560T3/es not_active Expired - Lifetime
• 2002
  • 2002-01-16 US US10/050,748 patent/US6688688B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events