EP0303996A2 - Chaise de travail avec siège pivotant - Google Patents

Chaise de travail avec siège pivotant Download PDF

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Publication number
EP0303996A2
EP0303996A2 EP88113175A EP88113175A EP0303996A2 EP 0303996 A2 EP0303996 A2 EP 0303996A2 EP 88113175 A EP88113175 A EP 88113175A EP 88113175 A EP88113175 A EP 88113175A EP 0303996 A2 EP0303996 A2 EP 0303996A2
Authority
EP
European Patent Office
Prior art keywords
spring
seat
lever
seat shell
seat 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.)
Granted
Application number
EP88113175A
Other languages
German (de)
English (en)
Other versions
EP0303996B1 (fr
EP0303996A3 (en
Inventor
Joachim Steinmann
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.)
Klober & Co GmbH
Kloeber GmbH and Co
Original Assignee
Klober & Co GmbH
Kloeber GmbH and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Klober & Co GmbH, Kloeber GmbH and Co filed Critical Klober & Co GmbH
Priority to AT88113175T priority Critical patent/ATE84686T1/de
Publication of EP0303996A2 publication Critical patent/EP0303996A2/fr
Publication of EP0303996A3 publication Critical patent/EP0303996A3/de
Application granted granted Critical
Publication of EP0303996B1 publication Critical patent/EP0303996B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
    • A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting 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
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/026—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by means of peg-and-notch or pawl-and-ratchet mechanism
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/443—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs

Definitions

  • the invention relates to a work chair with a seat shell which is pivotable in its inclination on a height-adjustable seat support, which is spring-loaded against the seat load by means of a force element arrangement arranged in the seat support and can be fixed in different swivel positions by means of a blocking element arrangement, the seat shell being next to it Front edge is connected to the seat support via a pivot axis
  • So-called tilt mechanisms for chairs and in particular for work chairs which, in order to meet ergonomic requirements, are equipped with very complex chair mechanisms, the adjustment of the backrest and seat being carried out separately or synchronously.
  • the mechanics are mainly designed so that an adjustment can only be made with a loaded seat, which then takes place more or less suddenly according to the mass on the seat.
  • the present invention was based on the object of creating a chair mechanics which on the one hand enables the use of relatively simple elements, and on the other hand an inclination adjustment with a smooth transition from an inclination position to equip to another, to which there was still a need for a concealed mechanism and a completely new look for a chair equipped in this way.
  • the present invention provides that the force element arrangement of the chair mechanism consists of a spring element supporting the seat shell to support the seat shell supporting the base shell at the transition area of the seat surface from a first spaced apart from the front pivot axis of the seat shell on the knee joint arrangement to the back surface of the seat shell supporting spring element, one toggle lever of the toggle arrangement with one end pivotable on a bearing pin on the seat support and the other a locking pin for interaction with a blocking device having toggle lever via a hinge pin on the other free end of the first-mentioned toggle lever, the first spring element articulated at one end to the first-mentioned toggle lever and fixed at the other end to the seat support in its orientation in the seat support for the pivoting movement of the toggle lever arrangement sive spring characteristic and the second spring element receiving the base load has a linear spring characteristic in its orientation to the load, and both spring elements are designed for a mutual superimposition of the two spring movements for the purpose of soft cushioning and cushioning of the seat shell.
  • the spring is mounted in a visually concealed manner in a two-part spring guide, and the lower spring guide part can be pivoted on the bottom side by means of a bearing bolt on a support fork fixedly arranged on the seat support superimposed, the spring element on the head side has a longitudinally axially guided fork flange by means of a guide pin, the fork of which is penetrated by an axis with freely rotating rollers thereon, on which the seat shell rolls on a circular path formed as a recess, and the fork flange furthermore a doe pivoting movement of the spring element for Change of the spring engagement point by hand via a flexible shaft causing spindle drive with a spindle nut pivotally mounted in the fork ter and having a spindle drive in engagement therewith.
  • the latching element is arranged in the form of a latching pin at the lower free end of the upper toggle lever which is pivotably supported on the lower toggle lever and which engages through a guide slot of a blocking lever pivotably mounted in the seat support and can be latched into the latching recesses provided in the guide slot is, whereby when the seat pan is tilted, the spring force of the first spring element articulated on the lower toggle lever continuously counteracts the seated load, and the function causing disengagement and engagement is carried out solely by the pivoting movement of the blocking lever by means of the locking lever attached to it by hand via an actuating shaft with a button becomes.
  • FIG. 1 shows the side view of the chair mechanism according to the invention in the preferred embodiment.
  • a base frame not shown, with a known lift assembly gat 17, a preferably diagonally projecting support in the form of a seat support 1 is fixed on the head side of the vertical lift column by means of a conical receptacle 18.
  • the outer end of the seat support 1 forms the pivot point of the seat shell 2 resting thereon, the front edge of which is pivotally connected to the seat support 1 on the pivot axis 8.
  • the rear or backrest transition area is supported by a spring element 4 which is vertically aligned in the starting position and is supported on a fork 44 which is fastened to the conical receptacle 18 with respect to the seat support 1.
  • the seat shell 2 is supported in the central region by a toggle lever arrangement 5, 6, which in the illustrated embodiment of the chair mechanism is acted upon in the supporting sense by a spring element 3 arranged longitudinally in the seat support.
  • Figure 1 shows the chair mechanism according to the invention in the starting position, i.e. with the seat shell 2 in the upper locking position.
  • the toggle lever arrangement is pivotably mounted with the lower lever 6 on a bearing pin 10 of the seat support 1, and in this starting position lies with a molded stop cam next to a stop element 59 on the seat support side.
  • the spring element 3 in the form of a pressure point spring is arranged between the lower lever 6 of the toggle lever arrangement and the outer end of the seat support 1.
  • the other end of the spring 3 is at the end of the Wegträ gers 1 anchored to a stop plate by means of a stop bolt 36 with nut 37, as can be seen in particular from FIG.
  • the upper toggle lever 5 of the toggle lever arrangement is pivotally mounted via a hinge pin.
  • the toggle lever 5 is penetrated approximately in the central region by the hinge pin, and thus forms two swivel arms.
  • the upper arm of the toggle lever 5 is connected in a supporting manner to the seat shell 2 via a bearing pin 9, while the lower arm of the toggle lever 5 carries a locking pin 15 which is firmly anchored and which engages with the blocking lever 14.
  • the blocking device initially consists of a shaft 27, which is shown in more detail in FIGS. 2 and 3.
  • This shaft is rotatably mounted in a tubular steel element 30 and is connected in a rotationally fixed manner at the outside end to a blocking button 29.
  • the other end projecting into the seat support 1 has a recess 28, with the free front end of the locking lever 24 resting against the spring around the outer circumference of this shaft 27.
  • FIG. 3b shows the blocking device in the locked position.
  • the free end of the locking lever 24 lies in the recess 28 of the shaft 27, and the locking pin 15 of the toggle lever 5 is fixed in a locking recess 16.
  • the locking lever 24 which is designed according to FIG. 2 with a ribbed plastic part Approach 26 is connected and carries a driving pin 25 which engages in an associated bore 34 on the blocking lever 14, is thereby pivoted, and with the pivoting of the locking lever 24, the blocking lever 14 is pivoted about the pivot point 23 at the same time. This position of the locking lever and the blocking lever is shown in FIG. 3a.
  • the blocking lever 14 With a counter-movement of the blocking button 29, the blocking lever 14 is pivoted back into the starting position via the locking lever 24, the locking pin 15 then comes back into the region of a locking recess 16, whereby the position of the seat shell 2 is blocked in both directions, namely in pivoting positions, as they are predetermined by the distance between the recesses 16.
  • a locking pin 15 ' is shown in dashed lines, which has been moved into the rear end position of the guide slot 39, in which it is not locked.
  • the seat support 1 itself has, in a manner known per se, a lift assembly 17 which engages in the cone receptacle 18 via a corresponding gas spring.
  • the valve of the gas spring is via an actuating cam 54 with a U-shaped pivot lever 53, which, as can be seen in FIG. 2, is pivotably mounted on the seat support 1 and at the opposite lever end via a screw be 52 formed coupling element is connected to an actuating shaft 51.
  • the actuating shaft 51 is rotatably mounted in a tubular steel element 30 and has an actuating button 50 connected to the shaft 51 in a rotationally fixed manner on the outside.
  • the rear cushioning of the seat shell 2 is carried out by the spring element 4, which is mounted on the support fork 44 by means of a bearing pin 11 arranged on the lower part 45 of the spring guide so as to be pivotable out of the vertical.
  • the lower spring guide includes an inner guide sleeve 56, onto which a helical compression spring as spring element 4 is pushed.
  • An upper spring guide 46 is telescopically displaceable in the lower spring guide 45.
  • the helical compression spring 4 rests with its upper end against a flange forming the upper end of the upper spring guide.
  • the upper spring guide 46 also includes an inner guide pin 55 which is freely displaceable in a central, central bore 57 of the lower spring guide 45. Through an opening provided in the bottom of the lower spring guide 45 and adapted to the cross section of the guide pin, the guide pin 55 can emerge from the floor, thus ensuring the required long-stroke travel.
  • the other spring guide 46, 45 is, as already explained and can be seen from the drawing figures, pivotally mounted on the bearing pin 11 on the seat support fork 44, and the entire spring arrangement 4 rolls off on the seat shell 2.
  • the flange closing the upper spring guide 46 after the top is designed as a fork flange 49, the upwardly projecting forks being penetrated by a roller axis 48 on which two rollers 42 are rotatably arranged on the outside of the forks. These rolls 42 roll on a circular path 12 in the form of a recess 43 in the seat shell 2.
  • the entire arrangement of the swing-out spring element 4 with support of the seat shell 2 via a roller arrangement enables the spring engagement point of the spring element 4 on the seat shell 2 to be adjusted and, in connection therewith, the very simple adaptation to different user weights.
  • An actuation chain is provided for adjustment from the position of the other operating elements, which includes a flexible shaft 33.
  • a spindle nut 40 is arranged in the area of the roller axis 48 and is in engagement with a spindle 7.
  • the spindle 7 is fixedly connected to the flexible shaft 33 via a counter bearing 70, the flexible shaft 33, as shown in dashed lines in FIG. 2 and shown in detail in FIG. 9, from the counter bearing 70 in a curved shape to the end of the actuating shaft 27 on the seat support side rotatably mounted tube element 30 and through a center bore of the shaft 27 to the outside end of the element 30, on which a weight adjustment button 32 is arranged and connected to the shaft 33 in a rotationally fixed manner.
  • the weight adjustment button In the embodiment shown (FIG. 8), 32 is rotatably mounted in the blocking button 29.
  • the lever arm L1 to L2 can now be changed by actuating the spindle arrangement. It is also essential that when pivoting the seat pan 2, the spring force of the Federele element 4 is increased, namely by simultaneously biasing the spring more when adjusting this spring 4 via the spindle 7. This is caused by the fact that the roller arrangement 42 can roll in the region of the cam track 12, it being important that this cam track 12 is eccentric in the direction with respect to the lower bearing point 11, so that the rollers 42 in the direction of the arrow when the upper bearing point is adjusted 41 pivoted backwards and thus come to a curve area that pushes the spring 4 together more, namely by the displacement 47, as can be seen from the difference S1 to S2 ( Figure 1).
  • the main advantage is thus achieved that the spring force can be adjusted simultaneously with the spindle adjustment. I.e. for a relatively small adjustment range, which is predetermined by the spindle length, the supporting force of the spring element 4 is changed disproportionately. In other words, on the one hand the entire spring arrangement is supported in a region of the seat shell 2 which is moved to the rear, and on the other hand the spring 4 is increasingly biased, which results in a double effect.
  • FIG. 5 shows the spring characteristic of spring 3
  • FIG. 6 shows the spring characteristic of spring 4.
  • the spring characteristic of spring 4 is linear, as represented by curve 60.
  • the spring 4 is preloaded so that the spring tension starts at point 61. If the envisaged spring 3 were now missing, then a simple spring characteristic would result on the linear curve up to point 62, which would, however, have the disadvantage that this results in much too rapid downward pivoting when the bed is loaded on the body of the user. The user would swivel the seat shell immediately, even with a slight shift of weight to the rear, as is known, but is not desired.
  • the linear curve 60 is assigned a non-linear curve 63 according to the spring characteristic of the spring 3, which is shown in FIG. 5.
  • the spring 3 is articulated on the lower toggle lever 6 of the toggle lever arrangement 5, 6, which means that this spring 3, and thus the entire seat shell 2, gives a progressive characteristic, as can be seen from curve 63 can be seen in Figure 5.
  • the curve 63 has a curve section 64, which rises very steeply in relation to the spring travel and then merges flat into a relatively straight curve section 65. If the spring characteristic of the spring 3 (FIG. 5) is used to superimpose the spring characteristic of the spring 4 (FIG. 6) by means of other elements, as is done with the described mechanics of the present invention, a curve is produced as shown in FIG. 7 is shown.
  • This curve labeled 66, has a curve section 64 with a relatively steep rise, but then changes into a curve section 67 with a soft progression to the end position, which means that the user first of all exerts a relatively large force to pull out the seat pan to pivot their rest position, but then, after overcoming the steep curve section 64, which requires only a small or short swivel path, a soft curve section 67 is reached, with which a gentle swinging of the seat shell begins.
  • the drawing figure 1 shows the position of the pivotable elements in the opposite end position in dash-dotted lines.
  • the inclination positions of the seat shell 2 that can be adjusted by the predetermined latching recesses 16 are also shown.
  • FIG. 11 also illustrates the position of the toggle lever arrangement 5, 6 and the spring element 3 articulated thereon in the lower pivoting position of the seat shell 2, the spring element 4 being able to allow the extreme inclination of the seat shell 2 when not pivoted out.
  • FIG. 10 shows, in a side view, how a chair, and here in particular a work chair, optically wins with this compact chair mechanism according to the invention if only a few compact elements are visible.
  • this chair mechanism according to the invention it is no longer necessary to cover the entire area underneath the seat shell far down.
  • only an upper upward strut 72 is now visible, in which the entire mechanism according to FIG. 1 is accommodated. Only the upper part of the toggle lever 5 protrudes from this strut 72, while only the spring guide 45, 46 can be seen at the rear.
  • the attractive thing about this illustration is that there is now an area 73 and an area 74 in which a clear view under the seat shell is possible, which leads to a completely new look.
  • a one-piece seat shell is generally assumed in this invention, it is of course also possible to mount the seat in the same way on the pivot axis 8 and to support it on the seat backrest, and the backrest runs from the seat onto an egg to store ner pivot axis in or on the seat support, in which case, in a slight modification, use a point synchronous mechanism for transmitting the pivoting movement to the backrest part or other suitable transmission elements.

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  • 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)
EP88113175A 1987-08-20 1988-08-12 Chaise de travail avec siège pivotant Expired - Lifetime EP0303996B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88113175T ATE84686T1 (de) 1987-08-20 1988-08-12 Arbeitsstuhl mit verschwenkbarer sitzschale.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873727784 DE3727784A1 (de) 1987-08-20 1987-08-20 Arbeitsstuhl mit verschwenkbarer sitzschale
DE3727784 1987-08-20

Publications (3)

Publication Number Publication Date
EP0303996A2 true EP0303996A2 (fr) 1989-02-22
EP0303996A3 EP0303996A3 (en) 1989-06-28
EP0303996B1 EP0303996B1 (fr) 1993-01-20

Family

ID=6334131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113175A Expired - Lifetime EP0303996B1 (fr) 1987-08-20 1988-08-12 Chaise de travail avec siège pivotant

Country Status (4)

Country Link
US (1) US4858993A (fr)
EP (1) EP0303996B1 (fr)
AT (1) ATE84686T1 (fr)
DE (2) DE3727784A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0406706A1 (fr) * 1989-07-01 1991-01-09 KÖNIG & NEURATH KG Dispositif de verrouillage pour chaises de bureau
EP0592009A1 (fr) * 1989-03-01 1994-04-13 Herman Miller, Inc. Mécanismes de réglage de la hauteur et de l'inclinaison d'une chaise

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5207479A (en) * 1990-06-06 1993-05-04 Kimball International, Inc. Chair control mechanism
US5417474A (en) * 1993-09-23 1995-05-23 Westinghouse Electric Corporation Tilt control mechanism for chairs
US5388889A (en) * 1993-09-23 1995-02-14 Westinghouse Electric Corporation Torque control mechanism for chairs
US5577807A (en) 1994-06-09 1996-11-26 Steelcase Inc. Adjustable chair actuator
US5738409A (en) * 1997-01-08 1998-04-14 Bursik; Thomas A. Rocking chair construction
TW414040U (en) * 1997-09-10 2000-12-01 Takano Co Ltd Device for tilting, swaying and fastening
DE19900454C2 (de) * 1999-01-08 2001-10-25 Andreas Struppler Stuhl, insbesondere Bürostuhl
US6224155B1 (en) 1999-01-12 2001-05-01 Steelcase Development Inc. Vertical height adjustment mechanism for chairs
DE20003313U1 (de) * 2000-02-23 2001-07-05 Koenig & Neurath Ag Federeinheit zur Gewichtseinstellung eines Stuhls
CA2310349A1 (fr) * 2000-05-22 2001-11-22 Todd D. Krupiczewicz Fauteuil de bureau
DE10200355A1 (de) * 2002-01-08 2003-07-17 Dauphin Friedrich W Gmbh Stuhl
DE102004050853A1 (de) * 2004-10-18 2006-04-20 Interstuhl Büromöbel GmbH & Co. KG Stuhl
ITVE20050027A1 (it) * 2005-04-28 2006-10-29 Imarc Spa Dispositivo di regolazione della forza di oscillazione in meccanismi per sedie da ufficio.
DE102008007569A1 (de) * 2008-02-05 2009-08-06 Wilkhahn Wilkening + Hahne Gmbh + Co. Sitzmöbel
JP2010096325A (ja) * 2008-10-20 2010-04-30 Oki Electric Ind Co Ltd 緩衝装置、椅子
US9072383B2 (en) 2012-08-16 2015-07-07 L&P Property Management Company Modular chair mechanism with self-weighing
ITTO20130650A1 (it) * 2013-07-31 2015-02-01 Pro Cord Spa Sedia con schienale oscillante
ES2616536T3 (es) * 2014-05-22 2017-06-13 Pro-Cord S.P.A. Silla con respaldo inclinable
DE102015006760B4 (de) * 2015-06-01 2017-07-27 König + Neurath AG Mechanismus für einen Stuhl mit einer Synchronmechanik; Verfahren zur Gewichtseinstellung für ein verbessertes dynamisches Sitzgefühl des Sitznutzers mittels eines Mechanismus für einen Stuhl mit einer Synchronmechanik

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE1918865A1 (de) * 1968-04-17 1970-08-06 Rene Ramillon Verstellbarer Liegestuhl
DE3316533A1 (de) * 1983-05-06 1984-11-08 Provenda Marketing AG, Herisau Arbeitsstuhl, insbesondere buerostuhl
EP0149041A2 (fr) * 1984-01-11 1985-07-24 Herman Miller, Inc. Mécanisme pour chaise inclinable
DE8529663U1 (de) * 1985-10-18 1987-11-19 Klöber GmbH & Co, 7770 Überlingen Arbeitsstuhl mit Neigungsmechanik von Sitzschale und Rückenlehne

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US2516172A (en) * 1949-03-14 1950-07-25 Charles A Baldwin Hydraulic seat
DE1955531C3 (de) * 1969-11-05 1980-12-11 Stabilus Gmbh, 5400 Koblenz Verstelleinrichtung für das Sitzteil von Stühlen
US3627252A (en) * 1969-12-22 1971-12-14 Yoshiomi Yamaguchi Tilting chair
US4533177A (en) * 1979-06-06 1985-08-06 Knoll International, Inc. Reclining chair
IT1161499B (it) * 1983-07-12 1987-03-18 Castelli Spa Sedia con dispositivo di regolazione automatica sensibile al peso della persona seduta
DE3537203A1 (de) * 1984-10-24 1986-04-24 Klöber GmbH & Co, 7770 Überlingen Arbeitsstuhl mit neigungsmechanik von sitzschale und rueckenlehne
US4796950A (en) * 1987-02-09 1989-01-10 Haworth, Inc. Tilt mechanism, particularly for knee-tilt chair

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1918865A1 (de) * 1968-04-17 1970-08-06 Rene Ramillon Verstellbarer Liegestuhl
DE3316533A1 (de) * 1983-05-06 1984-11-08 Provenda Marketing AG, Herisau Arbeitsstuhl, insbesondere buerostuhl
EP0149041A2 (fr) * 1984-01-11 1985-07-24 Herman Miller, Inc. Mécanisme pour chaise inclinable
DE8529663U1 (de) * 1985-10-18 1987-11-19 Klöber GmbH & Co, 7770 Überlingen Arbeitsstuhl mit Neigungsmechanik von Sitzschale und Rückenlehne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0592009A1 (fr) * 1989-03-01 1994-04-13 Herman Miller, Inc. Mécanismes de réglage de la hauteur et de l'inclinaison d'une chaise
EP0406706A1 (fr) * 1989-07-01 1991-01-09 KÖNIG & NEURATH KG Dispositif de verrouillage pour chaises de bureau

Also Published As

Publication number Publication date
DE3727784A1 (de) 1989-03-02
DE3877656D1 (de) 1993-03-04
EP0303996B1 (fr) 1993-01-20
EP0303996A3 (en) 1989-06-28
DE3727784C2 (fr) 1992-01-02
ATE84686T1 (de) 1993-02-15
US4858993A (en) 1989-08-22

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