EP2083657B1 - Mécanisme pour chaise de bureau - Google Patents

Mécanisme pour chaise de bureau Download PDF

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Publication number
EP2083657B1
EP2083657B1 EP07818987A EP07818987A EP2083657B1 EP 2083657 B1 EP2083657 B1 EP 2083657B1 EP 07818987 A EP07818987 A EP 07818987A EP 07818987 A EP07818987 A EP 07818987A EP 2083657 B1 EP2083657 B1 EP 2083657B1
Authority
EP
European Patent Office
Prior art keywords
spring
support
backrest
seat support
adjustment
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.)
Not-in-force
Application number
EP07818987A
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German (de)
English (en)
Other versions
EP2083657A1 (fr
Inventor
Hermann Bock
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.)
Bock 1 GmbH and Co KG
Original Assignee
Bock 1 GmbH and Co KG
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Filing date
Publication date
Application filed by Bock 1 GmbH and Co KG filed Critical Bock 1 GmbH and Co KG
Publication of EP2083657A1 publication Critical patent/EP2083657A1/fr
Application granted granted Critical
Publication of EP2083657B1 publication Critical patent/EP2083657B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • 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
    • 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
    • A47C1/03274—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 of torsion type
    • 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

Definitions

  • the invention relates to a mechanism for an office chair, in particular an office chair with a backrest support pivotable to the rear.
  • An object of the present invention is to provide a structurally particularly simple solution for adjusting the mecanical Wegverschwenkung an office chair.
  • the mechanism with a placeable on a chair column base support, a seat support, a back pivotable backrest support and a Provided spring arrangement for acting on the mechanism against movement of the backrest support.
  • the mechanism is characterized in that the seat support and the base support form a movement unit which is movable relative to the chair column depending on the weight of a user burdening the seat support, wherein moving the movement unit adjusting the bias of the spring assembly and / or an adjustment of the spring rate of the spring assembly has the consequence.
  • a key idea of the invention is to automatically provide the adjustment of the scatterlehnenverschwenkung, so without the user of the office chair for this in any form, either manually or with the help of a third-party drive, must perform additional steps.
  • the adjustment of the scholarlehnenverschwenkung is carried out according to the invention instead fully automatically only in that the user sits down on the office chair.
  • the mechanism adjusts automatically by the "swing resistance" of the backrest defining spring arrangement biased more or less or the spring rate (also called spring stiffness, spring stiffness or spring constant ) of the spring assembly is changed.
  • this adjustment is preferably made such that pivoting the backrest of the office chair opposes a large "swinging resistance", while pivoting the backrest is significantly easier for a low-weight user to accomplish.
  • the specific embodiment of the invention whether in the Adjusting the bias of the spring assembly one or more spring elements tensioned or relaxed.
  • a fully or partially relaxed in the unloaded state of the office chair spring element can be stretched under load or it takes place at a load on the office chair relaxation of a maximum or partially biased spring element spring.
  • an active loading of the mechanism against the movement of the backrest support by a number of already prestressed spring elements already takes place without a load of the seat support by a user.
  • the specific embodiment of the invention it is also left to whether the spring rate of one or more spring elements is changed and how the change of the spring rate.
  • seat carrier and base support move together with a load of the seat support by a user as a movement unit relative to the fixed chair column, said relative movement of the weight of User is dependent.
  • the type of movement that is involved is at first irrelevant to the realization of the invention. Preferably, however, it is a linear movement in the vertical direction, ie in the direction in which the user sits on the chair. In this way, a direct and very simple transmission of the weight for acting on the spring assembly is possible.
  • the base support and / or the seat support a linear guide For transmitting the relative movement to the spring assembly. If the chair column is guided in this case directly or via a guide element in the base support and / or in the seat support, then no additional components for realizing the invention are required. It is particularly advantageous if the linear guide is arranged vertically. By forming the receptacle as a linear guide and the vertical arrangement of the same a particularly simple, and thus cost-saving option is provided to convert the weight of the user of the office chair in a relative movement of the base support in the sense of vertical deflection.
  • the bias of the spring assembly and the spring rate of the spring assembly can be basically set according to the invention in two different ways.
  • a structurally simple solution and a small design is achieved according to a particularly preferred embodiment of the invention, in particular when seat support and base support are arranged such that they perform the relative movement to the chair column together, without changing their position to each other.
  • Force deflecting arrangements for moving the Base carrier such as lever between seat support and base support, are not provided.
  • Seat support and base support move instead on a single common trajectory.
  • the base support and seat support can be connected to one another via corresponding connecting elements.
  • base support and seat support are formed as a common component.
  • the embodiment of the solution according to the invention can take place both with the aid of a direct, as well as with the aid of an indirect influence on the spring arrangement, in particular by means of a direct or indirect action on a spring element of the spring arrangement.
  • a direct application of a spring element is thereby a change in the spring tension and / or the spring rate by a directly on the Spring element understood self-attacking force
  • an indirect application the change of the spring tension and / or the spring rate by an indirectly - so for example via an auxiliary element - on the spring element acting force is understood.
  • the spring element is preferably arranged in the base support or in the immediate vicinity of the base support, so that a direct articulation of the spring element can be realized in a simple manner.
  • a stationary leg spring is used, one leg of which is carried along by a load of the seat support base support or by the fixed chair column, while the other leg is supported on the mechanism such that a pivoting of the backrest only against the thus provided with a higher bias spring element is possible, the "swing resistance" thus increases by the articulation of the one leg in other words.
  • the other leg can attack in one embodiment of the invention directly on the backrest support itself.
  • Such a configuration is particularly advantageous for an asynchronous mechanism, in which only the backrest pivots while the seat support is fixed.
  • the invention may also be in another embodiment be designed so that the other spring leg is supported on the seat carrier pivotally connected to the backrest support.
  • This embodiment can be used particularly advantageously in a synchronizing mechanism in which the seat carrier is pivotable backwards synchronously with the backrest support and the spring arrangement is designed to act on the synchronizing mechanism against its synchronous movement of the seat and backrest support.
  • the other leg can be supported on the backrest support.
  • the tension of a helical compression spring which is supported against the pivoting movement of the backrest on the seat support of a synchronous mechanism, is increased via a cable pull fastened to the fixed chair column and entrained by the moving base support.
  • the cable is in this case from the base support to the Spring element guided over corresponding rollers, which prevent mechanical wear of the cable and at the same time allow a particularly smooth adjustment of the spring preload.
  • the cable is arranged such that it preferably extends completely in the housing of the base support or seat support and thus is not visible from the outside. This not only prevents contamination of the cable. For safety reasons, a hidden cable guide is recommended.
  • the concealed arrangement of the cable also from an aesthetic point of advantage.
  • the spring rate is adjusted by means of a transmission means in the form of a link in which an axis is guided and / or held, which in turn is connected to spring elements, such as tension springs.
  • the invention relates to the automatic adjustment of the "pivoting resistance" of the backrest, which can be done by a burden on the office chair by the user himself either by adjusting the bias or by adjusting the spring rate of the spring assembly of the mechanism or by a combination of both .
  • the constructive and functional statements described herein with respect to the adjustment of the bias of the spring assembly can therefore in other words also with the structural and functional information described herein with respect to the adjustment of the spring rate of the spring assembly connect, so that an automatic adjustment of the "swing resistance" of Backrest also by a combination of both Adjustments can be made.
  • the invention also describes a safety device for an office chair, by the unintentional adjustment of a set by the weight of the user spring arrangement is effectively avoided when pivoting the backrest support.
  • a first embodiment of the invention which shows the adjustment of the bias of a spring arrangement is in the Fig. 1 to 4 shown.
  • the mechanism described below essentially serves a synchronous mechanism, as described in the German patent DE 10 2005 003 383 is disclosed. The content of this patent is hereby incorporated in full in the present description.
  • the synchronizing mechanism 1 has a base support 2 which communicates with the upper end of a chair column (not shown) in a manner described in detail below.
  • the synchronous mechanism comprises a substantially frame-shaped seat support 4 and a fork-shaped in plan view backrest support 5, the cheeks 6, 7 are arranged on both sides of the base support 2.
  • the synchronizing mechanism comprises a spring arrangement described in detail below for acting on the mechanism in opposition to the movement of the backrest support 5.
  • the seat On the seat support 4, the seat provided with a padded seat (not shown) is mounted. On the side frame members 10 of the seat support 4, a number of seat longitudinal direction L successively arranged locking lugs 11 are provided, which serve in a known per se and unspecified manner of positioning and fastening of the seat on the seat support 4.
  • a backrest On the backrest support 5, a backrest, not shown, is attached, which is height adjustable in modern office chairs.
  • the backrest may also be integrally connected to the backrest support 5.
  • the entire synchronous mechanism 1 is with respect to the central longitudinal plane M (see. Fig. 2 ), what the actual Kinematics concerns mirror-symmetric structure. In that regard, in the following description always be based on both sides pairwise existing construction elements of the actual pivoting mechanism.
  • the backrest support 5 is on the one hand with the lower, forwardly directed end 12 of the cheek 6 to the base support 2 hingedly connected, namely mounted on a pivot axis 13 on the base support 2 such that the backrest support 5 about the pivot axis 13 approximately centrally directly on Base carrier 2 is articulated.
  • the backrest support 5 can be pivoted with the backrest about the center longitudinal axis 14 extending through the pivot axis 13 in the pivoting direction S.
  • the backrest support 5 is connected to the upper end 15 of the cheek 6 via a joint 16 with the seat support 4 at its rear end region 17. By pivoting the backrest thus the seat support 4 is taken and lowered in the pivoting direction S.
  • the seat support 4 is connected at its front end portion 21 with the base support 2 via a rotary-sliding joint (not shown in detail).
  • a rotary-sliding joint (not shown in detail).
  • the backrest support 5 Due to the shape of the backrest support 5 and its arrangement of the base support 2 and seat support 4 performs under load the backrest on the one hand, the backrest support 5 a pivoting movement in the pivoting direction S back down. By the pivoting movement but also the seat support 4 is pivoted both backwards down and moved horizontally in the region of the rotary-sliding joint to the rear. This results in no relevant lifting movement of the front end of the seat, which constrictions are avoided on the underside of the thigh.
  • the synchronizing mechanism 1 is biased by a spring arrangement counter to the pivoting direction S - ie to the basic position of the synchronous mechanism out.
  • This spring arrangement 50 is provided in the form of two leg springs 41, 41 ', which are aligned with each other in the transverse direction.
  • the torsion springs 41, 41 ' are positioned about the pivot axis 13.
  • the upwardly pointing leg 42 is supported on a guide prism 55, which is arranged on the underside 31 of the seat support 4, while the second, extending back leg 43 is supported in an adjustment mechanism according to the invention in the base support 2.
  • the torsion springs 41, 41 'exert a spring force against the rearward pivoting movement S of the backrest, which is variable by the adjustment mechanism.
  • the adjustment mechanism is essentially formed by a vertical linear guide 30, which is designed as part of the base support 2.
  • the linear guide 30 comprises a arranged in the base support 2 square guide opening 22 and a fitting in the guide opening 22 correspondingly shaped guide member 23.
  • Die Guide opening 22 is formed by suitable sub-elements 24 of the base support 2.
  • Guide opening 22 and guide member 23 may have other cross-sections in other embodiments of the invention.
  • a cone seat 3 is provided for fastening the upper end of the chair column. In other words, in the mounted state, the chair column and guide element 23 form a structural unit which rests fixedly in the guide opening 22 of the base support 2.
  • the diameter of the guide opening 22 is enlarged on its side facing the seat support 4 side, so that in the guide opening a stop 26 is formed.
  • the guide element 23 is located with its upper, provided with an enlarged diameter end 27 of the stop 26, see. Fig. 3 ,
  • the guide element 23 has a horizontally extending transverse opening 28, in which the leg 43 extending to the rear rests on the leg spring 41 and is supported and supported there on guide / support elements 29 provided in the transverse opening 28.
  • Pivot axis 13 and linear guide 30 are positioned so close to each other that the leg 43 in the assembled state readily pass through a corresponding provided in the sub-element 24 of the base support 2 passage opening 32 and can eino in the transverse opening 28.
  • the leg 43 In the unloaded state of the seat support 4, the leg 43 extends from the horizontal slightly inclined downward through the passage and transverse openings 28, 32 (not shown). In a partially loaded state of the seat support 4, as in Fig. 3 shown, the leg 43 extends substantially horizontally and thus approximately parallel to the bottom 33 of the transverse opening 28 of the guide member 23, without mechanical contact with the passage or transverse opening 28, 32.
  • the movement unit formed from the seat and base supports 2, 4 in the whole in the direction of movement, on a common trajectory, namely a vertical straight line 18, relative to the fixed assembly of chair column and guide member 23 moves down ,
  • the relative movement of the movement unit to the chair column is carried out without the situation of seat support 4 and base support 2 changed to each other.
  • the occurring during the relative movement between the guide member 23 and guide opening 22 friction is thereby reduced by the use of ball bearings, guide rings, sliding bushes or the like (not shown).
  • the rearwardly extending spring leg 43 of the leg spring 41 is taken from the bottom 33 of the transverse opening 28 and pushed upwards, that is deflected from the horizontal upwards, which leads to an increase in the bias of the leg spring 41. This has the consequence that the pivoting movement of seat support 4 and backrest support 5 in the pivoting direction S takes place against a greater resistance.
  • leg spring 41 Since the leg spring 41 is mounted floating on both sides, shifts in a pivoting of the seat support 4 backwards down, ie in the pivoting direction S, the pivot point of the upper spring leg 42. The position of the pivot point thus changes when the backrest load such that the pivot point in the direction of spring center 56 shifts. In addition, there is an automatic change of the spring behavior of the leg spring 41 during a movement in the pivoting direction S. In a pivoting of the seat, in other words, the leg spring 41 and thus the seat as a whole automatically harder.
  • the backrest support 5 is fastened with fastening screws 57 on the central pivot axis 13.
  • the diameter of the pivot axis 13 is selected such that the leg springs 41, 41 'do not rest on the pivot axis 13 in the cocked position.
  • the inner diameter of the leg springs 41, 41 ' is always greater than the diameter of the pivot axis 13. This ensures unimpeded rotation of the pivot axis 13 upon pivoting of the seat. In addition, annoying contact noise, such as squeaking, avoided. Since the two mounted on the pivot axis 13 leg springs 41, 41 'lie with their circumference in a manner of a prism formed spring support (not shown), the positioning of the leg springs 41, 41' still ensured in their operating position.
  • a second embodiment of the invention which shows the adjustment of the bias of a spring assembly is in the Fig. 5 to 9 shown.
  • the basis for the mechanics described below is essentially a synchronous mechanism, as described in the European patent EP 1 396 213 is disclosed. The content of this patent is hereby incorporated in full in the present description.
  • a base support 2' is provided, which is in the region of its rear end 34 in a manner described in detail below with the upper end of a chair column (not shown) in connection.
  • the backrest support 5 ' is in the region of the rear end 34 of the base support 2' via a transverse axis 35 pivotally mounted on the base support 2 '.
  • the backrest support 5 ' consists of two obliquely rearwardly upwardly extending side struts 36, 37, which form the connection to the (not shown) actual backrest.
  • two upwardly projecting bearing posts 38, 39 integrally formed, in which a not shown in detail transverse axis 40 is rotatably mounted.
  • the substantially plate-shaped seat support 4 ' has in the region of its front end a slot (not shown) with which the seat support 4 is seated on the transverse axis 40.
  • a rotary-sliding joint between the base and seat support 2 ', 4' is formed, ie the Seat support 4 'can pivot about the transverse axis 40 and at the same time move relative thereto in the direction of the slots.
  • the seat support 4 together with a corresponding upwardly projecting bearing projection 8, 9 on the two side struts 36, 37 of the backrest support 3 forms a pivot bearing about a transverse axis 41.
  • a spring arrangement 43 which has four helical compression springs 44 arranged parallel to one another on both sides of the central longitudinal plane M in a common horizontal plane.
  • an abutment arm 45 is provided for each helical compression spring 44, the front end of which is pivotably articulated relative to the base support 1 via a bearing head 46.
  • the rod-shaped shaft of the abutment arm 45 projects freely projecting backwards.
  • the rear end of the helical compression springs 44 is supported on a Verstelleiste 59 described in more detail below.
  • the front end of the helical compression springs 44 is seated on a transversely to the seat longitudinal direction L and horizontally extending, in cross section semicircular support strip 48 as abutment, which are supported with their semi-cylindrical, forward facing lateral surface in correspondingly cylindrical bearing recesses 49 on the seat support 4 '.
  • the compressive force of the adjustable between the adjustment 59 and the support bar 48 and biased helical compression springs 44 acts on the seat support 4 'relative to the base support 2' forward in the basic position shown.
  • the backrest support 5 ' is here in its maximum upright position.
  • this is essentially formed by a vertical linear guide 30 'as part of the base support 2', wherein this one in the base support 2 'arranged cylindrical guide opening 22' and in the guide opening 22 'in-lying guide element 23'.
  • the guide opening 22 ' is in turn formed by correspondingly suitable sub-elements 24' of the base support 2 '.
  • a cone seat 3 ' provided for fixing the upper end of a chair column, so that the chair column and guide element 23' in the mounted state form a structural unit which rests fixedly in the guide opening 22 'of the base support 2'.
  • the adjusting mechanism now comprises two cables 60, 60 'serving as transmission means for transmitting the weight of the user to the helical compression springs 44.
  • the Verstelleiste 59 serves to support the rear ends of the helical compression springs 44 and is provided with four openings 61 through which the shafts of the abutment arm 45 pass.
  • the adjustment bar 59 is slidably mounted on the shafts.
  • Each cable 60, 60 ' is arranged so that it leaves the guide opening 23' in the direction of relative movement of the moving unit down and then at least one adjacent to the guide opening 22 'arranged sub-element of the base support 2' partially surrounds, in other words, a sub-element of the base support 2 'away.
  • This partial element is preferably a deflection roller 62, so that the mechanical abrasion and thus the wear of the cables 60, 60 'is only very small.
  • the cable pull 60, 60' then extends to a further deflection roller 63 in the front end region 58 of the base support 2 ', the deflection roller 63 being fastened to the transverse axle 11 in the exemplary embodiment shown. From there, the cable 60, 60 'runs directly to the Verstelleiste 59, with which it is connected. If a burden of the seat support 4 'in that a user takes place on the office chair, as in Fig.
  • the relative movement of the movement unit to the chair column is carried out without the position of the seat support 4 'and base support 2' to each other changed.
  • the backrest support 5 ' When the backrest is pressed back, the backrest support 5 'is pivoted backwards. This pivots so that the seat support 4 'to the rear bottom to the rotary-sliding joint in the front region of the seat support 4'. In this case, the support bar 48 moves closer to the end of the abutment arm 45 out, so that the helical compression springs 44 are more compressed and thus build up a higher reaction force. If the backrest is relieved, then the seat support 4 'is pivoted by the helical compression springs 44 back up to the front, wherein the backrest support 5' is mitverschwenkt.
  • a third embodiment of the invention which shows the adjustment of the bias of a spring assembly is in the Fig. 10 to 13 shown.
  • the basis is essentially the already in the Fig. 1 to 4 illustrated synchronous mechanism.
  • the synchronizing mechanism 1 has a base support 2" which communicates with the upper end of a chair column (not shown) in a manner described in detail below.
  • the synchronizing mechanism comprises a substantially frame-shaped seat support (in Fig. 10 not shown for reasons of clarity) 4 "and a fork-shaped backrest support 5" whose cheeks 6 ", 7" are in turn arranged on both sides of the base support 2.
  • the synchronizing mechanism comprises a spring assembly described in detail below for acting on the Mechanics against the movement of the backrest support 5 ".
  • On the seat support 4 " is the provided with a padded seat seat (not shown) mounted.
  • a backrest (not shown in detail) is attached, which is adjustable in height in modern office chairs
  • the backrest can also be integrally connected to the backrest support 5".
  • the entire synchronous mechanism 1 "is with respect to the central longitudinal plane M (see. Fig. 11 ), which concerns the actual kinematics, constructed mirror-symmetrically. In that regard, in the following description always be based on both sides pairwise existing construction elements of the actual pivoting mechanism.
  • the backrest support 5 is on the one hand with the lower, forward end 12" of the cheek 7 "with the base support 2" directly hinged, namely on separate pivot elements 13 "on the base support 2" stored such that the backrest support 5 "on the In this way, the backrest support 5 "can be pivoted in the pivoting direction S with the backrest about the central longitudinal axis 14" extending through the pivoting elements 13 ".
  • the backrest support 5 is connected to the upper end 15" of the cheek 7 "via a joint 16" with the seat support 4 "at its rear end region 17". By pivoting the backrest, the seat support 4 "is thus also entrained and lowered in the pivoting direction S.
  • pivoting takes place around the articulation axis 19" of the articulation 16.
  • the geometry of the pivoting mechanism used has the advantage that a high lowering angle of the pivoting mechanism Seat support 4 "reached can be without the tilt angle of the backrest must be too large, which would lead to a lie-like position. Thus, the so-called “shirt extraction effect” is effectively avoided.
  • the seat support 4 is connected at its front end region 21" to the base support 2 "via a rotary-sliding joint (not shown in detail). as already in relation to the first embodiment on the contents of the patent DE 10 2005 003 383 directed.
  • the backrest support 5 Due to the shape of the backrest support 5 "and its arrangement of the base support 2" and seat support 4 "performs under load the backrest on the one hand, the backrest support 5" pivotal movement in the pivoting direction S back down.
  • the seat support 4 is also swiveled downwards to the rear and moved horizontally backwards in the region of the rotary-sliding joint, thus resulting in no relevant lifting movement of the front end of the seat surface, thereby avoiding constrictions on the underside of the thighs become.
  • the synchronizing mechanism 1 is pretensioned by a spring arrangement counter to the pivoting direction S-that is to say to the basic position of the synchronizing mechanism 15.
  • This spring arrangement 50 is in the form of two leg springs 41 “, 41”'which are aligned in the transverse direction.
  • the torsion springs 41 “, 41”' exert a spring force against the rearward pivoting movement S of the backrest, which is variable by the adjustment mechanism.
  • the rearwardly pointing leg 42 "of the leg spring 41” extends through a receiving opening 51 in the backrest support 5 "and is supported on a guide prism (not shown) on the backrest support 5", while the second, forwardly extending leg 43 "abuts
  • the position of the two guide prisms 52 can be adjusted vertically by means of a common adjustment mechanism 20 (not shown) by means of a common adjusting mechanism 20, whereby the prestressing of the leg springs 41 ", 41” 'via a change in position of the spring legs 43 "can also be set manually.
  • the torsion springs 41 ", 41” ' are now not positioned in this third embodiment about a pivot axis. Rather, they are in a vertically displaceable holding trough 53, which belongs to the adjustment mechanism of this embodiment.
  • the holding trough 53 forms a receptacle designed in the manner of a prism for the leg springs 41 ", 41” '.
  • the adjustment mechanism is essentially formed by a vertical linear guide 30 ", which is designed as part of the base support 2".
  • the linear guide 30 “comprises a square guide opening 22" arranged in the base support 2 "and a guide element 23" in the guide opening 22.
  • the guide opening 22 is formed by correspondingly suitable partial elements 24" (here housing parts) of the base support 2 ".
  • a cone seat 3 is provided for fastening the upper end of the chair column Guide element 23 "in the mounted state, a structural unit, which rests fixedly in the guide opening 22" of the base support 2 "For safe guidance of the guide member 23" in the guide opening 22 "eight vertically extending guide rails 54 are provided in the guide opening 22, with corresponding guide grooves (not shown) of the guide element 23 "correspond, see Fig. 11 ,
  • the guide element 23 has an arm 64 extending outward from the guide opening 22" in the direction of the torsion springs 41 “, 41", in the upper side 65 of which the transversely extending holding trough 53 for receiving the leg springs 41 ", 41” '. is provided.
  • the front partial element 24 "of the base support 2" has a corresponding vertical opening 66 for this purpose.
  • the legs 42 ", 43" extend substantially in a line, preferably from the bottom front to the rear top, ie the guide prism 52 is in the synchronizing mechanism 1 "arranged lower than that behind the receiving opening 51 arranged (and hidden in the figures ) Guide prism in the backrest support 5 ".
  • the movement formed by the seat and base support 2", 4 "movement unit as a whole in the direction of movement, on a common path of movement, namely a vertically extending Straight line 18 ", relative to the fixed assembly of chair column and guide member 23" moves down, see.
  • Fig. 13 The relative movement of the movement unit to the chair column takes place without the position of the seat support 4 "and base support 2" changed to each other.
  • FIGS. 14 to 19 A fourth embodiment of the invention, which shows the adjustment of the spring rate of a spring assembly 75, is shown in FIGS FIGS. 14 to 19 shown.
  • the entire synchronous mechanism 1 "'is in turn constructed mirror-symmetrically with respect to the central longitudinal plane M, which relates to the actual kinematics In this respect, in the following description, it is always assumed that mechanical components are present on both sides in pairs.
  • a base support 2"' is provided, which is in the region of its rear end 34 'in a manner described in detail below with the upper end of a chair column (not shown) in connection.
  • Other basic components of the synchronous mechanism 1 "' are the backrest support 5"' and the seat support 4 "'.
  • the backrest support 5 "' consists of two rearwardly extending side struts 36', 37 ', which form the connection to the (not shown) actual backrest.
  • the seat support 4 "'together with a corresponding, upwardly projecting bearing projection 8', 9 'on the two side struts 36', 37 'of the backrest support 3"' forms a pivot bearing about a transverse axis 41 '.
  • the pivot bearing is arranged behind the connection with the chair column.
  • two upwardly projecting bearing posts 39 ' are formed on either side of the central longitudinal plane M.
  • the bearing posts 39' form a rotary sliding joint (not in the Detail), whereby a movement of the seat support 4 "'to the rear becomes possible DE 10 2005 003 383 directed.
  • the seat support 4 "' is thus pivoted backwards with the pivoting backrest support 5"' via the transverse axis 41 'on the one hand and the rotary sliding joint on the other hand.
  • the two side struts 36 ', 37' of the backrest support 5 "' are extended beyond the bearing projections 8', 9 'also forward and in the area in front of the cone seat 3"' on a transverse axis 35 'pivotally mounted on the base support 2 "'.
  • a spring arrangement 75 which has two tension springs 67 arranged parallel to one another on both sides of the central longitudinal plane M in a common horizontal plane (in FIG Fig. 17 and 19 symbolically represented).
  • the tension springs 67 are mounted with their ends 42 "', 43"' in each case to transverse axes 68, 69 and connected thereto.
  • the other transverse axis 69 is movable and is held in a working position by the interaction of two linear guides Extension springs 67 are biased towards the basic position of the synchronous mechanism out.
  • the position of the tension springs 67 plays no decisive role in the realization of the invention. Of importance, however, the angle between the Switzerlandfederl Kunststoffsachsen 72 on the one hand and the first scenes 70 on the other hand, see. Fig. 19 ,
  • first links 70 are disposed in the forwardly extending side struts 36 ', 37' of the backrest support 5 "'.
  • the first links 70 are nearly vertical, with the upper end of the links 70 somewhat behind relative to the lower end shifted behind, cf. Fig. 15 and 17 .
  • the side struts 36 ', 37' extend so far forward that the transverse axis 69 is in the non-pivoted state in any case in front of the transverse axis 35 '.
  • the transverse axis 69 is positioned approximately above the transverse axis 35 ', when it is in the lower end position of the first scenes 70, see Fig.
  • the transverse axis 69 is in this state in the upper end position of the first scenes 70, so the transverse axis 69 is located behind the transverse axis 35 ', see Fig. 18 , The position of the transverse axis 69 in the first scenes 70 and thus the distance between the transverse axis 69 and the transverse axis 35 ', as described below, depending on weight and is adjusted by the user himself by this sits down on the office chair.
  • the second link 71 extends horizontally and is disposed in a lying in the central longitudinal plane M driver 73, which - similar to the arm 64 in the Fig. 12 and 13 - Is integrally connected to the guide element 23 '' and with this vertically movable, see. Fig. 17 ,
  • the driver 73 extends from the guide member 23 '' from the guide opening 22 '' so far forward that the first scenes 70 a displacement of the transverse axis 69 from a first position in which the transverse axis 69 in front of the transverse axis 35 ', in a second position in which the transverse axis 69 is located behind the transverse axis 35 'permits.
  • transverse axis 69 is located in a middle position in the guide 71, then it is positioned approximately above the transverse axis 35 '.
  • the second link 71 is used, inter alia, to allow a pivoting of the backrest support 5 "'and thus a synchronous movement in the construction according to the invention at all.
  • the tensile force of the tensioned between the transverse axes 68, 69 tension springs 67 acts on the seat support 4 "'relative to the base support 2"' forward in the basic position shown.
  • the backrest support 5 '' is here in its maximum upright position.
  • a vertical linear guide 30 "' which is designed as part of the base support 2"'.
  • the linear guide 30 '' comprises a square guide opening 22 '' arranged in the base support 2 '' and a guide element 23 '''engaging in the guide opening 22''.
  • the guide opening 22'' is thereby formed by correspondingly suitable partial elements 24''(here housing parts ) of the base support 2 "'formed.
  • a cone seat 3 On the underside 25 "'of the guide element 23"' is provided a cone seat 3 "'for fastening the upper end of the chair column Guide opening 22 "'of the base support 2"' rests.
  • a number of rollers are provided in the guide opening 22 "'for the formation of roller bearings 74.
  • the front partial element 24"' of the base carrier 2 "'again a vertical opening 66' for the driver 73, see. Fig. 14 ,
  • the transverse axis 69 When a burden on the office chair by a user, the transverse axis 69 is taken from the second link 71 and spent in the first scenes 70 in a working position, whereby the spring rate is set. If the user is relatively light, then the transverse axis 69 remains in a lower position of the scenes 70, see Fig. 15 and 16 , The spring stroke is comparatively short. For a heavier user, the transverse axis 69 shifts to an upper position in the first scenes 70, see Fig. 17 and 18 , The articulation points of the tension springs 67 move away from each other. The spring stroke is extended according to the weight of the user.
  • pivoting resistance changes itself as a result of the pivoting of the backrest Backrest is the backrest support 5 "'namely pivoted backwards, which - when much heavier with a heavy user than a light user - the position of the Transverse axis 69 changes again, in such a way that the pivoting resistance increases with increasing pivoting.
  • FIGS. 20 to 22 refer to which a schematic force-displacement diagram for the first three embodiments is given.
  • the lower characteristic curve KU represents the unloaded state
  • the upper characteristic curve KB the loaded state.
  • the distances F1, F2 of the starting points from the baseline correspond to the prestressing of the spring arrangement.
  • the gains achieved by the slope increases Z1, Z2 according to the spring stroke after pivoting about a pivot angle alpha, for example, 20 °.
  • a safety device is described below with reference to the fourth exemplary embodiment, with the aid of which unintentional adjustment of the weight-adjusted spring arrangement 75 can be effectively avoided when the backrest support 5 "is swiveled in.
  • the application of the safety device is not restricted to the fourth exemplary embodiment the safety device is instead readily adaptable to all embodiments of the invention as well as to other chair mechanisms.
  • a movable locking element 76 is provided, which automatically engages in a pivoting in a stationary support member 77 and the current setting of spring rate and / or bias locked, see. Fig. 19 ,
  • a locking element 76 is used in the example described here on the transverse axis 69 freely rotatably mounted sleeve 78, which has on its one side a pawl 79 in the manner of a locking edge.
  • the sleeve 78 is fixed to the transverse axis 69 in the region of one of the first scenes 70 such that the pawl 79 points forward towards the front inner wall 80 of the first link 70 and serving in one of the provided there, horizontally extending and serving as holding elements Tooth-like locking grooves 81 engages which are distributed substantially over the entire length of the link 70.
  • a pawl 79 is provided in the direction of latching grooves 81 acting spring element, for example in the form of a small leaf spring 82 or the like. Since the latching described is self-locking due to the weight load by a user, however, no large spring force is required to bring the pawl 79 in a latching position. This takes place almost automatically as soon as pivoting of the backrest support 5 "'begins.
  • a release of the pawl 79 takes place automatically when the backrest support 5 "'is swiveled into its starting position, whereby the latched pawl 79 projecting laterally beyond the link abuts against an adjacent inner wall 80 of the first link 70 and over it Rear projecting trip block 83, so that the latching is released, see. Fig. 14 , In the next pivoting of the backrest support 5 "'is then again a locking.
  • the locking element 76 does not have to be mounted on one side; It can also be provided for each first link 70, a separate locking element 76.
  • the four exemplary embodiments described above are merely preferred embodiments.
  • the invention can also be used with other synchronous mechanisms as well as with asynchronous mechanisms.
  • the invention can also be realized with the aid of other transmission means.
  • a toothed belt as a transmission means are then preferably used instead of the deflection rollers, as used in the second embodiment, gears which prevent slippage of the toothed belt.
  • gears which prevent slippage of the toothed belt.
  • other guides in particular open or semi-open guides can be used.
  • the guide need not be a linear guide either.
  • the use of non-linear guides can result in further advantageous adjustment properties of the mechanism. In particular, this makes it possible to achieve nonlinear spring rate characteristics.
  • spring elements can be used with the invention.
  • coil springs can be designed as compression or tension springs.
  • Other spring elements such as elastomers or the like, may find application.
  • the present invention can be combined with a variety of arrangements of the spring elements.
  • the spring elements may be arranged, for example, at other than the positions shown in the seat support or base support or in the backrest support. For example, must in the Fig. 1 to 4 Leg spring shown not necessarily be positioned in front of the linear guide. In other versions, she can also also be arranged behind, above or below the linear guide.
  • the trajectory of the movement unit formed from the seat and base supports 2, 4 also does not necessarily have to run vertically downwards, cf. Fig. 4 .
  • the linear guide with guide opening 22 and guide member 23 is not vertical, ie parallel to the vertical, but obliquely, ie at a certain angle relative to the vertical, in the base support 2 and The base carrier / seat carrier assembly is arranged.
  • the user settles as well as in Fig. 4 presented on the office chair.
  • the movement unit formed from the seat and base supports 2, 4 then does not move vertically in the direction of the straight line 18 downwards, but rather on a movement path that runs obliquely to the vertical, which is predetermined by the position of the linear guide.

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)

Abstract

L'invention concerne un mécanisme destiné à une chaise de bureau, en particulier une chaise de bureau comprenant un support de dossier pivotant vers l'arrière. L'invention a pour but de fournir une construction particulièrement simple permettant un réglage du pivotement d'un dossier d'une chaise de bureau. En conséquence, elle a pour objet un mécanisme comprenant un support de base (2, 2', 2' ', 2' ' '), pouvant être mis en place sur une colonne de la chaise, un support de siège (4, 4', 4' ', 4' ' '),un support de dossier pouvant pivoter vers l'arrière (5, 5', 5' ', 5' ' ') et un dispositif à ressort (50, 43, 50' ', 75) destiné à solliciter le mécanisme (1, 1', 1' ', 1' ' ') à l'encontre du mouvement du support du dossier (5, 5', 5' ', 5' ' '), caractérisé en ce que le support de siège (4, 4', 4' ', 4' ' ') et le support de base (2, 2', 2' ', 2' ' ') forment une unité de mouvement (2, 2', 2' ', 2' ', 4, 4', 4' ', 4' ' ') qui est déplaçable, par rapport à la colonne de la chaise, en fonction du poids d'un utilisateur chargeant le support de siège (4, 4', 4' ', 4' ' ') et en ce qu'un déplacement de l'unité de mouvement (2, 2', 2' ', 2' ' ', 4, 4', 4' ', 4' ' ') entraîne un réglage de la pré-tension du dispositif à ressort (50, 43, 50' ', 75) et/ou un réglage de la constante de ressort du dispositif à ressort.

Claims (11)

  1. Mécanique (1, 1', 1", 1"') pour un siège de bureau comprenant un support de base (2, 2', 2", 2"') pouvant être placé sur une colonne de siège, un support de siège (4, 4', 4", 4"'), un support de dossier (5, 5', 5", 5"') basculable vers l'arrière et un agencement de ressorts (50, 43, 50", 75) pour actionner la mécanique (1, 1', 1", 1"') contre le mouvement du support de dossier (5, 5', 5", 5"'), sachant que le support de siège (4, 4', 4", 4"') et le support de base (2, 2', 2", 2"') forment une unité de mouvement (2, 2', 2", 2", 4, 4', 4", 4"') qui est mobile par rapport à la colonne de siège en fonction du poids d'un utilisateur occupant le support de siège (4, 4', 4", 4"'), sachant qu'un mouvement de l'unité de mouvement (2, 2', 2", 2"', 4, 4', 4", 4"') a pour conséquence un réglage de la précontrainte de l'agencement de ressorts (50, 43, 50", 75) et/ou un réglage de la raideur de ressort de l'agencement de ressorts (50, 43, 50", 75), caractérisée en ce que le support de base (2, 2', 2", 2"') et/ou le support de siège (4, 4', 4" , 4"') présente (nt) un guidage linéaire (30, 30', 30", 30"') pour transmettre le mouvement relatif à l'agencement de ressorts (50, 43, 50", 75), sachant que la colonne de siège est dirigée dans le support de base (2, 2', 2", 2"') et/ou dans le support de siège (4, 4', 4", 4"').
  2. Mécanique (1, 1', 1"')selon la revendication 1, caractérisée en ce que le réglage de la précontrainte et/ou le réglage de la raideur de ressort s'effectue par une modification de la position d'au moins une extrémité de ressort (42, 43, 42", 43", 42"', 43"') d'un élément de ressort (41, 41', 44, 67) de l'agencement de ressorts (50, 43, 50", 75) dans une position générale restant essentiellement la même ou se modifiant de l'élément de ressort (41, 41', 41", 41"', 44, 67) .
  3. Mécanique (1") selon la revendication 1 ou 2, caractérisée en ce que le réglage de la précontrainte et/ou le réglage de la raideur de ressort s'effectue par une modification de la position de l'élément de ressort (41", 41"') lui-même par rapport à ses extrémités de ressort (42", 43") fixes ou également mobiles au moins partiellement.
  4. Mécanique (1, 1', 1", 1"') selon l'une des revendications 1 à 3, caractérisée en ce que le support de siège (4, 4', 4", 4"') et le support de base (2, 2', 2", 2"') sont ainsi placés qu'ils ne modifient pas leur position l'un par rapport à l'autre lors d'un mouvement relatif de l'unité de mouvement (2, 2', 2", 2"', 4, 4', 4", 4"').
  5. Mécanique (1, 1") selon l'une des revendications 1 à 4, caractérisée en ce que lors d'un mouvement relatif de l'unité de mouvement (2, 2", 4, 4"), un élément de ressort (41, 41', 41", 41"') de l'agencement de ressorts (50, 50") est actionné directement.
  6. Mécanique (1, 1") selon la revendication 5, caractérisée en ce que l'élément de ressort (41, 41', 41" , 41"') est entraîné par l'unité de mouvement (2, 2", 4, 4") lors d' un mouvement relatif de l'unité de mouvement (2, 2", 4, 4").
  7. Mécanique (1, 1"') selon l'une des revendications 1 à 6, caractérisée en ce que lors d'un mouvement relatif de l'unité de mouvement (2, 2"', 4', 4"'), un élément de ressort (44, 67) de l'agencement de ressorts (43, 75) est actionné indirectement.
  8. Mécanique (1', 1"') selon la revendication 7, caractérisée en ce que l'élément de ressort (44, 67) est entraîné par un moyen de transmission (60, 60', 59 ; 73, 70, 71) coopérant avec l'unité de mouvement (2', 2"', 4', 4"') lors d'un mouvement relatif de l'unité de mouvement (2', 2"', 4', 4"').
  9. Mécanique (1') selon la revendication 8, caractérisée en ce que le moyen de transmission est un moyen de traction (59), un levier, une courroie, une coulisse, une pluralité de coulisses coopérantes (70, 71) ou similaire.
  10. Mécanique (1, 1', 1", 1"') selon l'une des revendications 1 à 9, caractérisée en ce que le support de siège (4, 4', 4", 4"') peut être basculé vers l'arrière de manière synchrone avec le support de dossier (5, 5', 5", 5"') et l'agencement de ressorts (50, 43, 50", 75) est formé pour actionner la mécanique de synchronisation (1, 1', 1", 1"') contre le mouvement synchrone des supports de siège et de dossier (2, 2', 2", 2"', 5, 5', 5", 5"').
  11. Mécanique (1, 1', 1", 1"') selon l'une des revendications 1 à 10, caractérisée en ce qu'un dispositif de sécurité (76, 78, 79, 81) est prévu, par lequel un déplacement de l'agencement de ressorts (50, 42, 50", 75) réglé par le poids est évité lors d'une bascule du support de dossier (5"').
EP07818987A 2006-10-13 2007-10-12 Mécanisme pour chaise de bureau Not-in-force EP2083657B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE202006015892 2006-10-13
DE102006049040 2006-10-13
DE102007022015A DE102007022015A1 (de) 2006-10-13 2007-05-08 Mechanik für einen Bürostuhl
DE202007006762U DE202007006762U1 (de) 2006-10-13 2007-05-08 Mechanik für einen Bürostuhl
PCT/EP2007/008916 WO2008043574A1 (fr) 2006-10-13 2007-10-12 Mécanisme pour chaise de bureau

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EP2083657A1 EP2083657A1 (fr) 2009-08-05
EP2083657B1 true EP2083657B1 (fr) 2010-09-15

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US (1) US8146990B2 (fr)
EP (1) EP2083657B1 (fr)
DE (2) DE102007022015A1 (fr)
WO (1) WO2008043574A1 (fr)

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Also Published As

Publication number Publication date
DE202007006762U1 (de) 2008-02-14
US20090267394A1 (en) 2009-10-29
EP2083657A1 (fr) 2009-08-05
DE102007022015A1 (de) 2008-04-17
US8146990B2 (en) 2012-04-03
WO2008043574A1 (fr) 2008-04-17

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