EP0995372B1 - Office chair with a tracking backrest - Google Patents
Office chair with a tracking backrest Download PDFInfo
- Publication number
- EP0995372B1 EP0995372B1 EP99120681A EP99120681A EP0995372B1 EP 0995372 B1 EP0995372 B1 EP 0995372B1 EP 99120681 A EP99120681 A EP 99120681A EP 99120681 A EP99120681 A EP 99120681A EP 0995372 B1 EP0995372 B1 EP 0995372B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plunger
- assembly
- office chair
- spring
- support
- 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.)
- Expired - Lifetime
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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
- A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- 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
- A47C1/03277—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
- A47C3/02—Rocking chairs
- A47C3/03—Locking members
Definitions
- the invention relates to an office chair a backrest, the backrest support pivotable on a horizontal axis stationary chair holder is stored such that the backrest support against the Pressure of a return spring can be pivoted backwards is and by means of the restoring force the return spring one facing forward Movement of the upper body of the seat user follows.
- a special feature of such office chairs trackable backrest consists of that for certain office jobs where the back of the seat user is static
- the backrest support needs support in a swiveled forward Position by means of a locking device should be lockable.
- the invention was therefore based on the object a new return spring or a new one To develop the spring package that the desired has greater dynamism and (as before) in one forward pivoted position of the backrest support can be blocked or locked where there was another task, that the searched return spring or the new return spring package you are looking for same outer dimensions, mounting connections and should have operating procedures, to optionally also against a gas pressure spring or a gas pressure / metal spring assembly known Design to be replaced.
- the return spring in the form of a mechanical helical compression spring is formed, those between one assigned to the backrest support Thrust bearing and one assigned to the chair holder Thrust bearing is arranged, and that coaxially in the helical compression spring plunger attached to a thrust bearing exists in one in which other thrust bearing attached immersion sleeve runs, with the plunger moving radially has locking stops that can be opened on the outside, those in the issued state and in a largely extended position of the plunger on the peripheral edge of the Mount the immersion sleeve.
- the new plunger lockable metal pressure spring can with an additional outer Coil compression spring that coaxially the inside encloses the first metal compression spring, be combined into a metal spring package, like this from the drawings for this patent application is removable.
- the plunger lock ensures this the metal compression spring that the backrest support in a forward position of the backrest can be locked just as easily, like the seat user of the old gas spring technology knows.
- Such spreading scissors (de facto two in opposite directions around a common scissor axis movable rocker arm) has the advantage that squeezing the handling ends the spreading scissors in the simplest way and done permanently by spring force can.
- the plunger with his Piston area in which the end pieces of the Spreading scissors are positioned inside the immersion sleeve the remain end pieces intended as locking stops ineffective, since it is only on the inner wall slide along the immersion sleeve.
- swiveled forward Position of the backrest can the end pieces take effect, namely, when they come out of the pocket are and as locking stops on the Sit on the circumferential surface of the immersion sleeve.
- Another improvement of the new plunger lockable Metal compression spring is after Claim 2 characterized in that the Has circumferential edge of the immersion sleeve gradations, which correspond to the width of the Locking stops designed and in axial Staggered towards each other are so that by a rotational movement the immersion sleeve around its axis other graduated peripheral edge of the immersion sleeve for mounting the locking stops can be used. Accordingly, can the user of the seat preferred by him front locking position of the backrest select or set.
- FIG. 1 is a simplified side view the chair holder 5 of an office chair with a trackable backrest support 6 (swiveling about axis 7) and one synchronously thus pivotable seat support 8 shown. So that the synchronous adjustment is executable, the backrest support 6 via the axis 9 with the seat support 8 connected.
- the seat support has at the front end one firmly attached to it Sliding axis 10 in two congruent Slot control cams 11 in the side walls the chair holder 5 is guided.
- the control curves run from the front down to the back rising at the top, so that there is an increasing Displacement of the sliding axis 10 results when the backrest support 6 from its illustrated front backrest position in his (not shown) back back position is moved.
- the spring assembly 12 is shown in FIGS. 2 to 4 shown in more detail. It consists of one inner cylindrical helical compression spring 14 and an outer, coaxially arranged Helical compression spring 15. Both springs are separated from each other by the pipe section 16.
- the inner helical compression spring is between the disk 17 and the pot housing 18th clamped, and the outer helical compression spring lies on the one hand on the plate disk 17 and on the other hand on the screw cap 19 for the purpose of changing the preload the outer helical compression spring 15 on the external thread of the pot housing 18 can be adjusted axially.
- the plunger 21 is integral with the Plate 17 and the one shown on the left Crosshead 22 formed. He has one slot-like milling in which the two Rocker arms 23 and 24 of an expanding shear the scissors axis 25 are attached.
- the End pieces 26 and 27 of the spreading shears run in the position shown in FIG Plunger in the immersion sleeve 20 and sit in the shown in Fig. 4 Position of the plunger on the peripheral edge the immersion sleeve 20.
- the handling ends 28 and 29 of the spreading scissors are permanent by the U-shaped Leaf spring 30 loaded so that the end pieces 26 and 27 permanently the trend have, radially outwards from the cutout extend the plunger 21 and on the To sit on the peripheral edge of the immersion sleeve 20, as soon as the maximum extended from the immersion sleeve Position of the plunger this allowed.
- the spring assembly is then blocked i.e. the backrest support 6 of the office chair is then locked.
- a lever arrangement 30/31 (see Fig. 1) press on the feed wedge 32 acts by means of the handling ends 28 and 29 the spreading scissors against the pressure the U-shaped leaf spring 30 moved apart can be, so that the end pieces 26 and 27 of the spreading scissors again in their in the milling of the Plunger retracted position in which they with the plunger 21 in the Immersion sleeve 20 can be retracted.
- the ones at the bottom of the pocket Rubber balls 33 serve as an end stop at Retracting the plunger into the immersion sleeve.
- the lever arrangement 30/31 in the chair support 5 the office chair is in a known manner built that by an at least 90 ° swivel of the smaller lever 31 the larger lever 30 in a permanent position (Stop position) can be brought in the larger lever 30 the feed wedge 32 mechanically in the position according to Fig. 2 fixed in the locking the backrest support 6 not possible is.
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)
Description
Die Erfindung betrifft einen Bürostuhl mit einer Rückenlehne, deren Rückenlehnenträger um eine horizontale Achse schwenkbar an einem ortsfest gehaltenen Stuhlträger gelagert ist derart, daß der Rückenlehnenträger gegen den Druck einer Rückstellfeder nach hinten verschwenkbar ist und mittels der Rückstellkraft der Rückstellfeder einer nach vorne gerichteten Bewegung des Oberkörpers des Sitzbenutzers folgt. The invention relates to an office chair a backrest, the backrest support pivotable on a horizontal axis stationary chair holder is stored such that the backrest support against the Pressure of a return spring can be pivoted backwards is and by means of the restoring force the return spring one facing forward Movement of the upper body of the seat user follows.
Stühle dieser Art werden zum Zwecke des dynamischen Sitzens gebaut und sind insbesondere auch mit einer Synchronmechanik bekannt, bei der sich sowohl der Rückenlehnenträger als auch der Sitzflächenträger synchron um horizontale Achsen verschwenken.Chairs of this type are used for the purpose of dynamic sitting and are special also with a synchronous mechanism known in which both the backrest support as well as the seat support pivot synchronously around horizontal axes.
Eine Besonderheit solcher Bürostühle mit nachführbarer Rückenlehne besteht darin, daß für bestimmte Büroarbeiten, bei denen der Rücken des Sitzbenutzers eine statische Unterstützung benötigt, der Rückenlehnenträger in einer nach vorne verschwenkten Position mittels einer Arretiervorrichtung arretierbar sein soll.A special feature of such office chairs trackable backrest consists of that for certain office jobs where the back of the seat user is static The backrest support needs support in a swiveled forward Position by means of a locking device should be lockable.
Bekannte Bürostühle verwenden deshalb als Rückstellfeder für den Rückenlehnenträger eine Gasdruckfeder, die durch Sperren ihres Überströmventils in jeder Position arretiert werden kann. Das ist ein Vorteil, aber er muß mit dem Nachteil erkauft werden, daß die jeweilige Durchflußöffnung des Überstromventils die Vor- und Rückstellbewegungen der Rückenlehne bzw. des Rückenlehnenträgers dämpft. Damit ist auch die Dynamik der ausführbaren Sitzbewegungen gedämpft und insbesondere eine gedämpft ablaufende Rückstellbewegung der Rückenlehne ist meistens nicht in Übereinstimmung mit der größeren Dynamik-Bewegung des Sitzbenutzers. Known office chairs therefore use as Return spring for the backrest support a gas spring by locking her Overflow valve locked in any position can be. That is an advantage, but it is must be bought with the disadvantage that the respective flow opening of the overflow valve the forward and backward movements of the Backrest or the backrest support attenuates. This is also the dynamics of the executable Seat movements dampened and in particular a damped return movement the backrest is mostly not in line with the larger one Dynamic movement of the seat user.
Um diesem Nachteil der Gasdruckfedern entgegenzuwirken ist es bekannt, eine Gasdruckfeder mit einer zylindrischen Schraubendruckfeder zu kombinieren, die als äußere Metallfeder koaxial die Gasdruckfeder umschließt, um dieser durch entsprechende Kraftunterstützung mehr Dynamik zu verleihen. Dennoch, auch ein solches Federpaket wird im Ergebnis dem geforderten schnellen Nachführen der Rückenlehne bei einem großen Teil dynamisch veranlagter Sitzbenutzer nicht gerecht.To counteract this disadvantage of gas pressure springs it is known a gas pressure spring with a cylindrical helical compression spring to combine that as an outer Metal spring coaxially encloses the gas pressure spring, to this by appropriate Force support to give more dynamism. Nevertheless, such a spring package is also in the Result of the required quick tracking the backrest is largely dynamic assessed seat users not fair.
Der Erfindung lag deshalb die Aufgabe zugrunde, eine neue Rückstellfeder oder ein neues Federpaket zu entwickeln, das die gewünschte größere Dynamik hat und (wie bisher) in einer nach vorne verschwenkten Position des Rückenlehnenträgers blockiert bzw. arretiert werden kanr wobei als weitere Aufgabenstellung hinzukam, daß die gesuchte neue Rückstellfeder oder das gesuchte neue Rückstellfederpaket die gleichen äußeren Bauabmessungen, Montageanschlüsse und Bedienungsabläufe haben soll, um optional auch gegen eine Gasdruckfeder oder ein Gasdruck/Metallfederpaket bekannter Bauart ausgetauscht zu werden.The invention was therefore based on the object a new return spring or a new one To develop the spring package that the desired has greater dynamism and (as before) in one forward pivoted position of the backrest support can be blocked or locked where there was another task, that the searched return spring or the new return spring package you are looking for same outer dimensions, mounting connections and should have operating procedures, to optionally also against a gas pressure spring or a gas pressure / metal spring assembly known Design to be replaced.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Rückstellfeder in Form einer mechanischen Schraubendruckfeder ausgebildet ist, die zwischen einem dem Rückenlehnenträger zugeordneten Drucklager und einem dem Stuhlträger zugeordneten Drucklager angeordnet ist, und daß koaxial in der Schraubendruckfeder ein an dem einen Drucklager befestigter Tauchkolben vorhanden ist, der in einer in dem anderen Drucklager befestigten Tauchhülse läuft, wobei der Tauchkolben radial nach außen ausstellbare Arretieranschläge besitzt, die im ausgestellten Zustand und in einer weitgehend ausgefahrenen Position des Tauchkolbens auf dem Umfangsrand der Tauchhülse aufsitzen.This object is achieved according to the invention solved that the return spring in the form of a mechanical helical compression spring is formed, those between one assigned to the backrest support Thrust bearing and one assigned to the chair holder Thrust bearing is arranged, and that coaxially in the helical compression spring plunger attached to a thrust bearing exists in one in which other thrust bearing attached immersion sleeve runs, with the plunger moving radially has locking stops that can be opened on the outside, those in the issued state and in a largely extended position of the plunger on the peripheral edge of the Mount the immersion sleeve.
Auch die neue tauchkolben-arretierbare Metalldruckfeder kann mit einer zusätzlichen äußeren Schraubendruckfeder, die koaxial die innenliegende erste Metalldruckfeder umschließt, zu einem Metallfederpaket kombiniert sein, wie dies aus den Zeichnungen zu dieser Schutzrechtsanmeldung entnehmbar ist. Immer wird die große Dynamik der Metalldruckfedern für das schnelle Nachführen der Rückenlehne bzw. des Rückenlehnenträgers eines Bürostuhls voll genutzt, so daß es keine Defizite in der Dynamik des Bürostuhls der erfindungsgemäßen Art geben kann.Also the new plunger lockable metal pressure spring can with an additional outer Coil compression spring that coaxially the inside encloses the first metal compression spring, be combined into a metal spring package, like this from the drawings for this patent application is removable. Always great dynamics of the metal compression springs for that quick tracking of the backrest or Backrest support of an office chair fully used, so that there are no deficits in dynamics give the office chair of the type according to the invention can.
Dabei gewährleistet die Tauchkolben-Arretierung der Metalldruckfeder, daß der Rückenlehnenträger in einer vorderen Position der Rückenlehne ebenso problemlos arretiert werden kann, wie der Sitzbenutzer dies von der alten Gasdruckfeder-Technik kennt. The plunger lock ensures this the metal compression spring that the backrest support in a forward position of the backrest can be locked just as easily, like the seat user of the old gas spring technology knows.
Nach der Lehre der Erfindung sind die aus dem Tauchkolben ausstellbaren Arretieranschläge durch die Endstücke einer Spreizschere gegeben, die in dem Tauchkolben gelagert ist und deren Endstücke beim Zusammendrücken der Handhabungsenden der Spreizschere aus der Umfangsfläche des Tauchkolbens heraustreten.According to the teaching of the invention, they are out locking stops that can be extended by the plunger through the end pieces of an expanding shear given that in the plunger is stored and the end pieces at Squeezing the handling ends of the Spreading scissors from the peripheral surface of the Step out of the plunger.
Eine solche Spreizschere (de facto sind es zwei um eine gemeinsame Scherenachse gegenläufig bewegbare Kipphebel) hat den Vorteil, daß das Zusammendrücken der Handhabungsenden der Spreizschere in einfachster Weise und permanent durch Federkraft erfolgen kann. So lange der Tauchkolben mit seinem Kolbenbereich, in dem die Endstücke der Spreizschere positioniert sind, sich innerhalb der Tauchhülse befindet, bleiben die als Arretieranschläge bestimmten Endstücke unwirksam, da sie lediglich an der Innenwandung der Tauchhülse entlanggleiten. Erst in der gewünschten,nach vorne verschwenkten Position der Rückenlehne können die Endstücke wirksam werden, dann nämlich, wenn sie aus der Tauchhülse herausgefahren sind und als Arretieranschläge auf der Umfangsfläche der Tauchhülse aufsitzen.Such spreading scissors (de facto two in opposite directions around a common scissor axis movable rocker arm) has the advantage that squeezing the handling ends the spreading scissors in the simplest way and done permanently by spring force can. As long as the plunger with his Piston area in which the end pieces of the Spreading scissors are positioned inside the immersion sleeve, the remain end pieces intended as locking stops ineffective, since it is only on the inner wall slide along the immersion sleeve. First in the desired, swiveled forward Position of the backrest can the end pieces take effect, namely, when they come out of the pocket are and as locking stops on the Sit on the circumferential surface of the immersion sleeve.
Diese Neutralisierung der Wirkung der permanent vorgespannten Spreizschere durch die Tauchhülse hat für den Sitzbenutzer den Bedienungsvorteil, daß er jederzeit und in jeder Sitzposition die Arretiervorrichtung für das Arretieren der Rückenlehne in einer nach vorne verschwenkten Position aktivieren kann, wobei dann nachfolgend die Arretierung der Rückenlehne erst dann automatisch eintritt, wenn die vordere Schwenkposition der Rückenlehne erreicht ist.This neutralization of the effect of permanently pre-tensioned scissors the immersion sleeve has the for the seat user Operating advantage that it can be used at any time and in the locking device in every sitting position for locking the backrest in one Activate the swiveled forward position can, the locking then the backrest only comes in automatically, if the front swivel position of the backrest is reached.
Soll die Arretierung wieder aufgehoben werden, dann ist nach Anspruch 4 vorgesehen, daß die mittels Federkraft permanent zusammengedrückten Handhabungsenden der Spreizschere durch Einschieben eines Vorschubkeils wieder auseinandergedrückt werden, wobei die Endstücke der Spreizschere in den Tauchkolben eingezogen werden und der Tauchkolben in die Tauchhülse einfahren kann.If the lock is to be released again, then it is provided according to claim 4 that the permanently compressed by spring force Handling ends of the spreading shears by pushing them in a feed wedge pushed apart again be, the end pieces of the spreading scissors are drawn into the plunger and insert the plunger into the immersion sleeve can.
Soll die Arretierung auf Dauer aufgehoben sein,
dann wird gemäß Anspruch 5 vorgeschlagen, daß
der Vorschubkeil in seiner vorgeschobenen
Position, in der er die Handhabungsenden der
Spreizschere auseinanderdrückt, mechanisch
fixiert werden kann.If the lock is to be released permanently,
then it is proposed according to
Eine weitere Verbesserung der neuen tauchkolbenarretierbaren Metalldruckfeder ist nach Anspruch 2 dadurch gekennzeichnet, daß der Umfangsrand der Tauchhülse Abstufungen aufweist, die entsprechend der Breite der Arretieranschläge ausgebildet und in axialer Richtung der Tauchhülse zueinander versetzt sind, so daß durch eine Rotationsbewegung der Tauchhülse um ihre Achse jeweils ein anderer abgestufter Umfangsrand der Tauchhülse für das Aufsitzen der Arretieranschläge benutzt werden kann. Dementsprechend kann der Sitzbenutzer die von ihm bevorzugte vordere Arretierposition der Rückenlehne wählen bzw. einstellen.Another improvement of the new plunger lockable Metal compression spring is after Claim 2 characterized in that the Has circumferential edge of the immersion sleeve gradations, which correspond to the width of the Locking stops designed and in axial Staggered towards each other are so that by a rotational movement the immersion sleeve around its axis other graduated peripheral edge of the immersion sleeve for mounting the locking stops can be used. Accordingly, can the user of the seat preferred by him front locking position of the backrest select or set.
Alternativ zu der vorbeschreibenen Verwendung einer Spreizschere in dem Tauchkolben kann gemäß Anspruch 6 auch vorgesehen sein, daß die in dem Tauchkolben gelagerten Arretieranschläge durch einen oder mehrere pneumatisch aus- und einfahrbare Stellkolben gebildet sind, die über einen druckluftdichten Verbindungsschlauch mit einem aus- und einfahrbaren Steuerkolben kommunizieren.As an alternative to the use described above spreading scissors in the plunger according to claim 6 also be provided that the locking stops in the plunger by one or more pneumatic extendable and retractable actuating pistons are formed are over a compressed air-tight connection hose with an extendable and retractable control piston communicate.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnungen näher beschrieben. Es zeigen:
- Fig. 1
- eine prinzipielle Darstellung eines Bürostuhls mit nachführbarer Rückenlehne,
- Fig. 2
- einen Längsschnitt durch ein tauchkolben-arretierbares Metallfederpaket gemäß der Erfindung,
- Fig. 3
- eine um 90° gedrehte Seitenansicht mit teilweiser Schnittdarstellung des Federpakets gemäß Fig. 2,
- Fig. 4
- das Federpaket gemäß Fig. 2 in seiner Arretierposition.
- Fig. 1
- a basic representation of an office chair with adjustable backrest,
- Fig. 2
- 2 shows a longitudinal section through a plunger lockable metal spring assembly according to the invention,
- Fig. 3
- 3 shows a side view rotated by 90 ° with a partial sectional view of the spring assembly according to FIG. 2,
- Fig. 4
- the spring assembly according to FIG. 2 in its locking position.
In Fig. 1 ist in einer vereinfachten Seitenansicht
der Stuhlträger 5 eines Bürostuhls mit
einem nachführbaren Rückenlehnenträger 6
(schwenkbar um Achse 7) und einem synchron
damit verschwenkbaren Sitzflächenträger 8
dargestellt. Damit die Synchronverstellung
ausführbar ist, ist der Rückenlehnenträger 6
über die Achse 9 mit dem Sitzflächenträger 8
verbunden. Am vorderen Ende besitzt der Sitzflächenträger
eine an ihm fest angeordnete
Schiebeachse 10, die in zwei deckungsgleichen
Langloch-Steuerkurven 11 in den Seitenwänden
des Stuhlträgers 5 geführt ist. Die Steuerkurven
verlaufen von vorne unten nach hinten
oben ansteigend, so daß sich ein ansteigender
Verschiebeweg der Schiebeachse 10 ergibt,
wenn der Rückenlehnenträger 6 aus seiner dargestellten
vorderen Rückenlehnenposition in
seine (nicht-dargestellte) hintere Rückenlehnenposition
bewegt wird.In Fig. 1 is a simplified side view
the
An der Schiebeachse 10 des Sitzflächenträgers 8
(der wirkungsmäßig mit dem Rückenlehnenträger
6 verbunden ist) ist das eine Drucklager
des Federpaketes 12 angelenkt. Das
andere Drucklager des Federpaketes 12 ist
durch die Querachse 13 im Stuhlträger 5 gegeben. On the sliding
Das Federpaket 12 ist in den Figuren 2 bis 4
genauer dargestellt. Es besteht aus einer
inneren zylindrischen Schraubendruckfeder 14
und einer äußeren, koaxial dazu angeordneten
Schraubendruckfeder 15. Beide Federn sind
voneinander durch das Rohrstück 16 getrennt.
Die innere Schraubendruckfeder ist zwischen
der Tellerscheibe 17 und dem Topfgehäuse 18
eingespannt, und die äußere Schraubendruckfeder
liegt einerseits an der Tellerscheibe 17
und andererseits an dem Überwurfschraubdeckel 19
an, der zum Zwecke der Veränderung der Vorspannung
der äußeren Schraubendruckfeder 15
auf dem Außengewinde des Topfgehäuses 18
axial verstellt werden kann.The
Im Inneren der inneren zylindrischen Schraubendruckfeder
14 ist eine Tauchhülse 20 vorhanden,
die mit dem darstellungsgemäß rechten
Drucklager (das ist die Schiebeachse 10) fest
verbunden ist. In diese Tauchhülse taucht ein
an dem linken Drucklager (das ist die Querachse
13) befestigter Tauchkolben 21 ein.Inside the inner cylindrical
Der Tauchkolben 21 ist einstückig mit der
Tellerscheibe 17 und dem links dargestellten
Querhaupt 22 ausgebildet. Er besitzt eine
schlitzartige Ausfräsung, in der die beiden
Kipphebel 23 und 24 einer Spreizschere auf
die Scherenachse 25 aufgesetzt sind. Die
Endstücke 26 und 27 der Spreizschere laufen
in der in Fig. 2 dargestellten Position des
Tauchkolbens in der Tauchhülse 20 und
sitzen in der in Fig. 4 dargestellten
Position des Tauchkolbens auf dem Umfangsrand
der Tauchhülse 20 auf.The
Die Handhabungsenden 28 und 29 der Spreizschere
sind permanent durch die U-förmige
Blattfeder 30 belastet, so daß die Endstücke
26 und 27 permanent die Tendenz
haben, radial nach außen aus der Ausfräsung
des Tauchkolbens 21 auszufahren und auf dem
Umfangsrand der Tauchhülse 20 aufzusitzen,
sobald die maximal aus der Tauchhülse ausgefahrene
Position des Tauchkolbens dies
erlaubt. Das Federpaket ist dann blockiert,
d.h. der Rückenlehnenträger 6 des Bürostuhls
ist dann arretiert.The handling ends 28 and 29 of the spreading scissors
are permanent by the U-shaped
Zum Entarretieren des Rückenlehnenträgers 6
muß der Sitzbenutzer in bekannter Weise
eine Hebelanordnung 30/31 (siehe Fig. 1)
betätigen, die auf den Vorschubkeil 32
wirkt mittels dem die Handhabungsenden 28
und 29 der Spreizschere entgegen dem Druck
der U-förmigen Blattfeder 30 auseinanderbewegt
werden können, so daß dann die Endstücke
26 und 27 der Spreizschere sich
wieder in ihrer in die Ausfräsung des
Tauchkolbens eingezogenen Position befinden,
in der sie mit dem Tauchkolben 21 in die
Tauchhülse 20 eingefahren werden können.
Die am Boden der Tauchhülse vorhandenen
Gummi-Kugeln 33 dienen als Endanschlag beim
Einfahren des Tauchkolbens in die Tauchhülse.To unlock the backrest support 6
the seat user must in a known manner
a
Die Hebelanordnung 30/31 im Stuhlträger 5
des Bürostuhls ist in bekannter Weise so
gebaut, daß durch eine mindestens 90°-Verschwenkung
des kleineren Hebels 31 der
größere Hebel 30 in eine Dauerposition
(Halteposition) gebracht werden kann, in
der der größere Hebel 30 den Vorschubkeil
32 mechanisch in der Position gemäß
Fig. 2 fixiert, in der eine Arretierung
des Rückenlehnenträgers 6 nicht möglich
ist.The
Claims (6)
- Office chair,characterisedhaving a back-rest, the back-rest support of which is mounted on a chair support, which is kept stationary, so as to be pivotable about a horizontal axis,in such a manner that the back-rest support is pivotable rearwardly in opposition to the pressure of a restoring spring and follows, by means of the restoring force of the restoring spring, a forwardly directed movement of the upper body of the chair user,the back-rest support being lockable in a forwardly pivoted position by means of a locking device,in that the restoring spring is in the form of a mechanical helical compression spring (14), which is disposed between a thrust bearing (10), associated with the back-rest support (6), and a thrust bearing (13) associated with the chair support (5),in that a plunger piston (21), which is secured on the one thrust bearing (13), is provided coaxially in the helical compression spring and travels in a plunger sleeve (20), which is secured on the other thrust bearing (10),and in that the plunger piston (21) has radially outwardly openable locking stop members (26, 27) which, in the opened state and in a largely extended position of the plunger piston, rest on the circumferential edge of the plunger sleeve (20).
- Office chair according to claim 1, characterisedin that the plunger sleeve is rotatable about its axis,and in that the circumferential edge of the plunger sleeve includes stepped portions which correspond to the width of the locking stop members and are offset from one another when viewed with respect to the axial direction.
- Office chair according to claim 1 or 2, characterisedin that locking stop members are provided by the end-pieces (26, 27) of an expanding scissor-like assembly which is mounted in the plunger piston (21), and the end-pieces of which assembly extend from the circumferential face of the plunger piston when the manipulation ends (28, 29) of the expanding scissor-like assembly are compressed.
- Office chair according to claim 3, characterisedin that the manipulation ends (28, 29) of the expanding scissor-like assembly are permanently compressed by spring force (30),and in that the manipulation ends of the expanding scissor-like assembly are pressed apart by means of a feed wedge (32) to retract the end-pieces of the expanding scissor-like assembly into the plunger piston.
- Office chair according to claim 4, characterisedin that the feed wedge (32) can be mechanically fixed in its advanced position, in which it presses apart the manipulation ends of the expanding scissor-like assembly.
- Office chair according to claim 1 or 2, characterisedin that the locking stop members are formed by one or more pneumatically extendible and retractable adjusting pistons, which communicate with an extendible and retractable control piston by means of a compressed-air-tight connection hose.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29819143U DE29819143U1 (en) | 1998-10-21 | 1998-10-21 | Office chair with a adjustable backrest |
| DE19849521 | 1998-10-21 | ||
| DE19849521A DE19849521A1 (en) | 1998-10-21 | 1998-10-21 | Office chair with adjustable backrest |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0995372A1 EP0995372A1 (en) | 2000-04-26 |
| EP0995372B1 true EP0995372B1 (en) | 2003-04-09 |
Family
ID=42320198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99120681A Expired - Lifetime EP0995372B1 (en) | 1998-10-21 | 1999-10-19 | Office chair with a tracking backrest |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6283548B1 (en) |
| EP (1) | EP0995372B1 (en) |
| DE (3) | DE19849521A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2518216C2 (en) * | 2008-07-04 | 2014-06-10 | Мацей ШИМАНСКИ | Armchair |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10008453C2 (en) * | 2000-02-23 | 2002-07-18 | Koenig & Neurath Ag | Spring unit for weight adjustment of a chair |
| DE10241562A1 (en) | 2002-09-07 | 2004-03-18 | Bock-1 Gmbh & Co. | Synchronous mechanism for office chairs |
| US7226130B2 (en) * | 2002-09-12 | 2007-06-05 | Steelcase Development Corporation | Seating with comfort surface |
| US6969116B2 (en) * | 2003-12-30 | 2005-11-29 | Hni Technologies Inc. | Chair with backward and forward passive tilt capabilities |
| HK1064859A2 (en) * | 2004-06-21 | 2005-01-14 | Yu Yeung Tin | Synchronous coordinate system of back of chair. |
| DE102009020244A1 (en) * | 2009-05-07 | 2010-11-11 | Ferdinand Lusch Gmbh & Co Kg | Seating furniture with adjustable seating position |
| DE102009025993B3 (en) | 2009-06-18 | 2011-01-20 | C. Ed. Schulte Gesellschaft mit beschränkter Haftung Zylinderschloßfabrik | Locking device and key for a locking device |
| WO2011148414A1 (en) * | 2010-05-26 | 2011-12-01 | タカノ株式会社 | Counterforce mechanism for backrest of chair and chair incorporating the said |
| JP6040566B2 (en) * | 2012-05-15 | 2016-12-07 | コクヨ株式会社 | Chair |
| PL2886015T3 (en) * | 2013-12-17 | 2017-01-31 | Donati S.P.A. | Chair with adjustable backrest |
| CA2852691A1 (en) * | 2014-05-27 | 2015-11-27 | Keilhauer Ltd. | Seat pan-based spring tilt mechanism |
| GB2551737B (en) | 2016-06-28 | 2019-06-05 | Posturite Ltd | Seat tilting mechanism with two springs |
| IT201600071468A1 (en) * | 2016-07-08 | 2018-01-08 | Co Fe Mo Ind S R L | OSCILLATION MECHANISM FOR CHAIRS |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4479679A (en) * | 1981-06-08 | 1984-10-30 | Steelcase Inc. | Body weight chair control |
| DE3521488A1 (en) * | 1985-06-14 | 1986-12-18 | August Fröscher GmbH & Co KG, 7141 Steinheim | WORK CHAIR |
| IT1210753B (en) * | 1987-05-20 | 1989-09-20 | Pro Cord Srl | SWINGING SUPPORT FOR SEATS AND SIMILAR CHAIRS |
| DE3724605C2 (en) * | 1987-07-24 | 1994-02-03 | Inaba Seisakusho Ltd | Seating |
| US5026117A (en) * | 1987-11-10 | 1991-06-25 | Steelcase Inc. | Controller for seating and the like |
| US4889384A (en) * | 1988-07-10 | 1989-12-26 | Leggett & Platt, Incorporated | Knee-action chair control |
| DE3900220A1 (en) * | 1989-01-05 | 1990-07-12 | Wilkhahn Wilkening & Hahne | CHAIR |
| DE4038072A1 (en) * | 1990-11-29 | 1992-06-04 | Uredat Ind Design | Chair with height adjustment member - has swivel connecting part with detachable locking means |
| DE4308455A1 (en) * | 1993-03-17 | 1994-09-22 | Suspa Compart Ag | Setting device for bearers longitudinally adjustable by pressure medium |
| ES2110875B1 (en) * | 1994-04-21 | 1998-11-16 | Jevit Manufact Metalicas Sa | SELF-BALANCED ERGONOMIC ARMCHAIR. |
| DE29516840U1 (en) * | 1995-10-25 | 1995-12-14 | Voelkle Rolf | Reset device for a chair |
| US5909924A (en) * | 1997-04-30 | 1999-06-08 | Haworth, Inc. | Tilt control for chair |
-
1998
- 1998-10-21 DE DE19849521A patent/DE19849521A1/en not_active Withdrawn
- 1998-10-21 DE DE29819143U patent/DE29819143U1/en not_active Expired - Lifetime
-
1999
- 1999-10-19 DE DE59904932T patent/DE59904932D1/en not_active Expired - Fee Related
- 1999-10-19 EP EP99120681A patent/EP0995372B1/en not_active Expired - Lifetime
- 1999-10-21 US US09/422,490 patent/US6283548B1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2518216C2 (en) * | 2008-07-04 | 2014-06-10 | Мацей ШИМАНСКИ | Armchair |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19849521A1 (en) | 2000-04-27 |
| US6283548B1 (en) | 2001-09-04 |
| DE29819143U1 (en) | 1999-02-11 |
| DE59904932D1 (en) | 2003-05-15 |
| EP0995372A1 (en) | 2000-04-26 |
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