CH413263A - Seating furniture with an adjustable backrest that can be adapted to the shape of the body - Google Patents
Seating furniture with an adjustable backrest that can be adapted to the shape of the bodyInfo
- Publication number
- CH413263A CH413263A CH540161A CH540161A CH413263A CH 413263 A CH413263 A CH 413263A CH 540161 A CH540161 A CH 540161A CH 540161 A CH540161 A CH 540161A CH 413263 A CH413263 A CH 413263A
- Authority
- CH
- Switzerland
- Prior art keywords
- seating furniture
- furniture according
- backrest
- partial
- backrests
- Prior art date
Links
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
- A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
- A47C1/023—Reclining or easy chairs having independently-adjustable supporting parts the parts being horizontally-adjustable seats ; Expandable seats or the like, e.g. seats with horizontally adjustable parts
-
- 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
- A47C3/20—Chairs or stools with vertically-adjustable seats
- A47C3/24—Chairs or stools with vertically-adjustable seats with vertical spindle
-
- 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
- A47C7/402—Support for the head or the back for the back adjustable in height
-
- 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
- A47C7/405—Support for the head or the back for the back with double backrests
-
- 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
- A47C7/445—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame 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
- 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
- A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
Landscapes
- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Chair Legs, Seat Parts, And Backrests (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
- Special Chairs (AREA)
Description
Sitzmöbel mit verstellbarer, an die Körperform anpassbarer Rückenlehne Die Erfindung betrifft ein Sitzmöbel mit verstell barer, an die Körperform anpassbarer Rückenlehne.
Es sind bereits Sitzmöbel mit Rücklehnen be kannt, die einer bestimmten Körpergestalt etwa ent sprechen, wenn der Sitzende eine bestimmte Haltung einnimmt. Es ist jedoch erwünscht, dass die Sitzmö bel auch den Bewegungen des Sitzenden, z. B. an einem Schreibtisch, Rechnung tragen. Diesem Erfor dernis der Anpassung der Rückenlehnen an die ver schiedenen Körperhaltungen, die sich aus der Bewe gung des Oberkörpers beim sitzenden Arbeiten erge ben, werden die bekannten Sitzmöbel nicht oder nur unzureichend gerecht. Es genügt nicht, der Rücken lehne wie bei bekannten Sitzmöbeln eine bestimmte Hohlform oder Schrägneigung zu geben. Die bekann ten, in der Höhe verstellbaren elastischen Kreuzstüt zen, wie sie insbesondere für Maschinenschreiberin nen bekannt sind, entsprechen diesen Anforderungen ebenfalls nicht.
Ziel der Erfindung ist die Schaffung eines Sitz möbels der eingangs genannten Gattung mit einer Rückenlehne, die möglichst genau den individuellen Unterschieden, die sich aus der Körpergrösse und der Gestallt des Rückens des Einzelnen ergeben, anpass- bar ist und die den Bewegungen des Arbeitenden folgt, wobei sie, ohne diesen zu stören, eine ständige, auf eine möglichst grosse Rückenfläche wirkende, weiche Abstützung bietet.
Hierzu sieht die Erfindung vor, dass die Rücken lehne in wenigstens zwei Teillehnen unterteilt ist, welche unabhängig voneinander in der Höhe verstell bar sowie vor- bzw. zurückschiebbar sind.
Bei einer bevorzugten Ausführungsform der Er findung ist vorgesehen, dass die Teillehnen der Rük- kenlehne durch voneinander unabhängige Tragarme in Führungen unterhalb der Sitzfläche vor- und zu- rückschiebbar gelagert sind und dass die Teillehnen an den zugehörigen Trägern höhenverstellbar ange- bracht sind.
Ausserdem können die Teillehnen unabhängig voneinander um eine horizontale und zur Lehnenflä- che parallele Achse schwenkbar angeordnet sein.
Bei einer weiteren Ausführungsform ist vorgese hen, dass die Tragarme für die Teillehnen federnd ausgebildet sind.
Eine zusätzliche Ausführungsform kann so aus gebildet sein, dass die Teillehnen der Rückenlehne aus miteinander scharnierartig und beispielsweise federnd verbundenen Elementen bestehen, deren Lage zueinander durch eine Blattfeder mit regulier barer Spannung verändert werden kann.
Weiterhin kann vorgesehen sein, dass das Sitzteil gegenüber dem tragenden Gestell vor- und zurück schiebbar angeordnet ist und dass die relativ zuein ander gleitenden Teile mit einem Ueberzug versehen sind, wobei der überzug aus Plastik bestehen kann.
Ausführungsbeispiele der Erfindung werden im folgenden anhand der Zeichnung beschrieben.
Fig.1 zeigt einen in der Höhe verstellbaren Drehstuhl in Rückenansicht, bestehend aus dem tra genden Drehfussgestell 1 mit Fussring 2, Sitzteil 3 und Rückenlehne 4a, 4b. Diese Rückenlehne ist zweiteilig gegliedert, wobei der untere Teil 4a der Kreuzstützung und der obere Teil 4b der Abstützung der Körperpartien oberhalb des Kreuzes dient. Die Teile 4a, 4b sind jedes für sich einzeln an elastischen Stahlrundstäben 5a bzw.<I>5b</I> in der Höhe verschieb- lich durch Feststellschrauben 6a bzw. 6b, die mit Brückenteilen<I>7a</I> bzw.<I>7b</I> die Rundstäbe<I>5a</I> bzw. 5b an die Glieder 4a, 4b pressen, befestigt.
Wie aus Fig. 2 und in grösserem Massstabe aus Fig. 3 ersichtlich ist, verlaufen diese die Rückenlehne tragenden Rundstäbe 5a und<I>5b</I> unter dem Sitz 3 so durch mit entsprechenden Löchern versehene Win kelstücke 8a, 8b hindurch, dass sie einzeln vor oder rückwärts verschoben werden können (s. Fig.3). Hierdurch ist es möglich, die Abstützung der indivi duellen Körperform des Sitzenden (z. B. Hohlkreuz) genau anzupassen.
Die Tragarme können auch mittels Zug- oder Druckfedern, die durch Schrauben reguliert werden, abgefedert werden.
Die Teile 4a, 4b können ausser durch die bereits erwähnte Höhenverstellung auch durch Schwenken um eine horizontale Achse 9a, 9b sich der individuel len Körpergestaltung der einzelnen Rückenpartien gemeinsam mit der bereits vorgenannten waagerech ten Verschieblichkeit der einzelnen Rückenlehnen glieder genauestens anpassen.
Da eine feste, konkave Formbildung der einzel nen Glieder je nach der individuellen Rückengestal tung nicht den Erfordernissen entsprechen kann, ist weiterhin vorgesehen, die gegliederte Rückenlehne in scharnierartig miteinander verbundene elastische Elemente aufzuteilen.
Die Fig.4-7 zeigen ein Teil einer Rückenlehne, bei welchem 3 Elemente 11a, 11b, 11c miteinander scharnierartig durch eingelassene Federn 12 verbun den sind. An der Rückseite des Teiles ist eine Blatt feder 13 so befestigt, dass sie in ihrer Mitte durch eine Regulierschraube 14. mehr oder minder stark durchgebogen werden kann. Wird die Schraube ange zogen, so werden die Elemente 11b und 11c mehr nach aussen geschwenkt. Es kann somit ganz nach Belieben eine mehr oder minder offene oder ge schlossene Hohlform zur Anpassung an die Wölbung des Rückens gebildet werden.
Die Fig. 1, 2, 3, 8, 9, 10 zeigen schematisch ein Sitzteil 3, das nach vorn und zurück bei gleichblei bender Stellung des tragenden Gestelles 1 geschoben werden kann. Dazu ist an dem tragenden Gestell ein Schieber 15 befestigt, der in seitlichen Führungen 16 und 17 mit Nuten gleitet.
In den Fig. 11, 12, 13 wird eine etwas andere Ausführung des Schiebers und seiner Führung ge zeigt. Der Schieber 18 besitzt U-förmige Seitenteile 19, an denen plastische Gleiter 20 angeordnet sind, die sich in U-förmigen seitlichen Führungsschienen 21 bei dem Vor- und Zurückschieben des Sitzes be wegen.
Seating furniture with an adjustable backrest that can be adapted to the body shape The invention relates to seating furniture with an adjustable backrest that can be adapted to the body shape.
Seating furniture with backrests are already known that correspond to a certain body shape, for example, when the person sitting assumes a certain posture. However, it is desirable that the Sitzmö bel also the movements of the sitter, for. B. at a desk. This requirement of adapting the backrests to the various postures that result from the movement of the upper body when working while sitting, the known seating furniture does not do justice to, or only insufficiently. It is not enough to give the backrest a certain hollow shape or inclination, as is the case with known seating furniture. The well-known, height-adjustable elastic Kreuzstüt zen, as they are particularly known for typists, do not meet these requirements either.
The aim of the invention is to create a piece of seating furniture of the type mentioned at the outset with a backrest which can be adapted as precisely as possible to the individual differences resulting from the body size and the shape of the back of the individual and which follows the movements of the worker, without disturbing it, it offers constant, soft support that acts on the largest possible back surface.
For this purpose, the invention provides that the backrest is subdivided into at least two partial backrests, which can be adjusted in height and pushed forwards or backwards independently of one another.
In a preferred embodiment of the invention it is provided that the partial backrests of the backrest are supported so that they can be pushed forwards and backward by independent support arms in guides below the seat surface and that the partial backrests are attached to the associated supports so that they can be adjusted in height.
In addition, the partial backrests can be arranged to be pivotable about a horizontal axis parallel to the backrest surface, independently of one another.
In a further embodiment it is provided that the support arms for the partial backrests are designed to be resilient.
An additional embodiment can be formed in such a way that the partial backrests of the backrest consist of hinge-like and, for example, resiliently connected elements, the position of which can be changed by a leaf spring with adjustable tension ble.
Furthermore, it can be provided that the seat part is arranged so that it can be pushed back and forth with respect to the supporting frame and that the parts sliding relative to one another are provided with a cover, the cover being made of plastic.
Embodiments of the invention are described below with reference to the drawing.
Fig.1 shows a height-adjustable swivel chair in a rear view, consisting of the tra lowing swivel base frame 1 with foot ring 2, seat part 3 and backrest 4a, 4b. This backrest is divided into two parts, the lower part 4a serving to support the cross and the upper part 4b to support the parts of the body above the cross. The parts 4a, 4b are each individually adjustable in height on elastic steel rods 5a or <I> 5b </I> by means of locking screws 6a or 6b, which are connected to bridge parts <I> 7a </I> or <I> 7b </I> press the round bars <I> 5a </I> or 5b onto the links 4a, 4b.
As can be seen from Fig. 2 and on a larger scale from Fig. 3, these round bars 5a and <I> 5b </I> carrying the backrest extend under the seat 3 through angular pieces 8a, 8b provided with corresponding holes that they can be moved individually forwards or backwards (see Fig. 3). This makes it possible to precisely adapt the support to the individual body shape of the person sitting (e.g. hollow back).
The support arms can also be cushioned by means of tension or compression springs, which are regulated by screws.
The parts 4a, 4b can except by the already mentioned height adjustment by pivoting about a horizontal axis 9a, 9b of the individuel len body design of the individual back parts together with the aforementioned horizontal th displaceability of the individual backrests members precisely adjust.
Since a solid, concave shape of the individual limbs can not meet the requirements depending on the individual back design, it is also provided to divide the articulated backrest into hinge-like interconnected elastic elements.
4-7 show a part of a backrest in which 3 elements 11a, 11b, 11c are connected to one another in a hinge-like manner by means of embedded springs 12. On the back of the part a leaf spring 13 is attached so that it can be bent more or less strongly in its center by a regulating screw 14. If the screw is tightened, the elements 11b and 11c are pivoted more outward. A more or less open or closed hollow shape to adapt to the curvature of the back can thus be formed as desired.
1, 2, 3, 8, 9, 10 show schematically a seat part 3 which can be pushed forwards and backwards with the supporting frame 1 in the same position. For this purpose, a slide 15 is attached to the supporting frame, which slides in lateral guides 16 and 17 with grooves.
11, 12, 13 shows a slightly different embodiment of the slide and its guide ge. The slide 18 has U-shaped side parts 19 on which plastic sliders 20 are arranged, which be in U-shaped lateral guide rails 21 when sliding the seat back and forth.
Claims (1)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB57483A DE1221772B (en) | 1960-04-13 | 1960-04-13 | Seating |
CH540161A CH413263A (en) | 1960-04-13 | 1961-05-08 | Seating furniture with an adjustable backrest that can be adapted to the shape of the body |
GB16822/61A GB925337A (en) | 1960-04-13 | 1961-05-09 | Improvements in or relating to seats each having an adjustable back |
US111322A US3059971A (en) | 1960-04-13 | 1961-05-19 | Seat comprising a plurality of individually adjustable back members |
FR863225A FR1298392A (en) | 1960-04-13 | 1961-05-29 | Chair or similar piece of furniture comprising a subdivided, elastic and movable backrest as well as a sliding seat |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB57483A DE1221772B (en) | 1960-04-13 | 1960-04-13 | Seating |
CH540161A CH413263A (en) | 1960-04-13 | 1961-05-08 | Seating furniture with an adjustable backrest that can be adapted to the shape of the body |
GB16822/61A GB925337A (en) | 1960-04-13 | 1961-05-09 | Improvements in or relating to seats each having an adjustable back |
US111322A US3059971A (en) | 1960-04-13 | 1961-05-19 | Seat comprising a plurality of individually adjustable back members |
FR863225A FR1298392A (en) | 1960-04-13 | 1961-05-29 | Chair or similar piece of furniture comprising a subdivided, elastic and movable backrest as well as a sliding seat |
Publications (1)
Publication Number | Publication Date |
---|---|
CH413263A true CH413263A (en) | 1966-05-15 |
Family
ID=45953337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH540161A CH413263A (en) | 1960-04-13 | 1961-05-08 | Seating furniture with an adjustable backrest that can be adapted to the shape of the body |
Country Status (5)
Country | Link |
---|---|
US (1) | US3059971A (en) |
CH (1) | CH413263A (en) |
DE (1) | DE1221772B (en) |
FR (1) | FR1298392A (en) |
GB (1) | GB925337A (en) |
Cited By (2)
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US4744603A (en) * | 1986-04-10 | 1988-05-17 | Steelcase Inc. | Chair shell with selective back stiffening |
US5385388A (en) * | 1991-11-12 | 1995-01-31 | Steelcase Inc. | Split back chair |
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US3469883A (en) * | 1967-07-20 | 1969-09-30 | Hyland C Flint | Seat assembly |
US3765718A (en) * | 1972-01-10 | 1973-10-16 | C Chen | Folding chair |
US4157203A (en) * | 1977-05-09 | 1979-06-05 | Center For Design Research And Development N.V. | Articulated double back for chairs |
DE8300753U1 (en) * | 1983-01-13 | 1983-07-21 | Röder GmbH Sitzmöbelwerke, 6000 Frankfurt | DEVICE FOR ATTACHING A LUMBAR PAD TO A CHAIR |
NZ208410A (en) * | 1984-06-06 | 1989-02-24 | Atlas Furniture Ltd | Chair with dual independently adjustable pivotal backrest parts |
US4732423A (en) * | 1986-10-27 | 1988-03-22 | Bio-Architectural Design, Inc. | Invalid's chair construction |
ATE56599T1 (en) * | 1987-01-30 | 1990-10-15 | Equus Marketing Ag | A CHAIR, IN PARTICULAR AN OFFICE CHAIR, WITH A SEAT AND A MULTIPLE BACK. |
US4795212A (en) * | 1988-01-29 | 1989-01-03 | Herman Miller, Inc. | Chair back adjustment |
IT1219524B (en) * | 1988-04-12 | 1990-05-18 | Giordano Pasutto | ADJUSTABLE LUMBAR CUSHION FOR SEATS, ARMCHAIRS COORDINATED FOR WRITING AND SIMILAR, FOR PREVENTIVE AND ADJUVANT ACTION IN THE CURATIVE OF ARTHROSIS, HERNIAS DISCALS, SCOLIOSIS OF THE VERTEBRAL COLUMN |
NO165054C (en) * | 1988-09-07 | 1990-12-19 | Asbjoernsen & Jan Lade A S Sve | DEVICE FOR ADJUSTABLE SEAT PUSHING ON CHAIR. |
US5195804A (en) * | 1988-07-19 | 1993-03-23 | Stolle Herbert D | Back-rest having two oval shaped shells each concave to vertical and convex to horizontal |
ATE135541T1 (en) * | 1994-08-12 | 1996-04-15 | Steelcase Strafor Sa | NEW STRUCTURE FOR OFFICE CHAIRS |
US6146317A (en) * | 1996-03-28 | 2000-11-14 | Prusick; Vincent R. | Exercising device |
US5730688A (en) * | 1996-03-28 | 1998-03-24 | Prusick; Vincent R. | Portable abdominal-lumbar exercise device |
JP3325783B2 (en) * | 1996-10-09 | 2002-09-17 | センター フォア デザイン リサーチ アンド ディベロプメント ナームローゼフェンノートチャップ | Adjustable chair |
JP3462782B2 (en) * | 1999-02-26 | 2003-11-05 | 星野楽器株式会社 | Drum chair backrest structure |
USD429926S (en) * | 1999-04-27 | 2000-08-29 | Zi-Wen Cao | Backrest support frame for a chair |
US6126235A (en) * | 1999-10-25 | 2000-10-03 | Grove; James E. | Chair back with adjustable lumbar cushion and clothes hanger hook included within a handle |
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DE20104124U1 (en) * | 2001-03-08 | 2001-09-27 | Schipke, Norbert, 93142 Maxhütte-Haidhof | Height-adjustable backrest for vehicle seats and vehicle seats |
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US20050046258A1 (en) * | 2003-07-09 | 2005-03-03 | Sanchez Gary L. | Task chair |
US7396082B2 (en) * | 2002-03-29 | 2008-07-08 | Garrex Llc | Task chair |
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GB2390795A (en) * | 2002-07-18 | 2004-01-21 | Thomas William Douglas Harper | Back support for fishing tackle seat box |
ITTO20020775A1 (en) * | 2002-09-06 | 2004-03-07 | Pro Cord Spa | BACK OF CHAIR. |
US7207629B2 (en) * | 2003-06-23 | 2007-04-24 | Herman Miller, Inc. | Tilt chair |
US6945601B1 (en) * | 2003-12-23 | 2005-09-20 | Yao-Chuan Wu | Multi-stage backrest assembly |
US6843530B1 (en) * | 2003-12-23 | 2005-01-18 | Yao-Chuan Wu | Multi-stage backrest assembly |
US7585028B2 (en) * | 2005-02-09 | 2009-09-08 | Jenkins Jeffrey B | Mobile ergonomic rotating adjustable chair with lumbar support |
US7222920B1 (en) * | 2005-06-17 | 2007-05-29 | Washington James N | Adjustable chair |
US7357453B2 (en) * | 2005-07-04 | 2008-04-15 | Wu Wenjin | Chair with armrests |
CN102772052B (en) | 2007-01-29 | 2016-03-16 | 赫尔曼米勒有限公司 | Seat structure and using method thereof |
GB2448688A (en) | 2007-04-23 | 2008-10-29 | Jcm Seating Solutions Ltd | A segmented seat back assembly |
DE102007036198A1 (en) * | 2007-08-02 | 2009-02-05 | Da Yin Wei Tong Co., Ltd. | Coupling device for coupling backrest or headrest to seat of chair i.e. rotatable chair, has flexible connecting sections integrally provided between central section and one side element for flexibly coupling headrest and backrest at rail |
US7967379B2 (en) * | 2008-12-29 | 2011-06-28 | L&P Property Management Company | Seat with independently adjustable user support assemblies |
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US10034548B2 (en) | 2009-01-23 | 2018-07-31 | Backjoy Orthotics, Llc | Apparatus and system for dynamically correcting posture |
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US11229294B2 (en) | 2012-09-20 | 2022-01-25 | Steelcase Inc. | Chair assembly with upholstery covering |
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US11304528B2 (en) | 2012-09-20 | 2022-04-19 | Steelcase Inc. | Chair assembly with upholstery covering |
US20140221881A1 (en) * | 2013-02-06 | 2014-08-07 | Better Back Technologies, LLC | Device for repetitive spine extension at selectable lumbar levels for stimulation of vertebral segments |
GB2543565B (en) * | 2015-10-23 | 2019-10-09 | Ratstands Ltd | Stackable chair |
FR3047394B1 (en) * | 2016-02-10 | 2019-09-20 | Revology Sa | CHAIR WITH FLEXIBLE LUMBAR SUPPORT |
AU2020224628A1 (en) | 2019-02-21 | 2021-08-26 | Steelcase Inc. | Body support assembly and methods for the use and assembly thereof |
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US11744375B2 (en) * | 2021-07-14 | 2023-09-05 | Anthro Form, Llc | Seat configuration |
WO2023287872A2 (en) * | 2021-07-14 | 2023-01-19 | Anthro Form, Llc | Seat configuration |
USD1032267S1 (en) | 2021-12-09 | 2024-06-25 | Michael V. Halliday | Chair |
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CH13208A (en) * | 1896-10-22 | 1897-05-31 | Dossier Lombaire Mobile A Mauc | Perfected armchair |
US693685A (en) * | 1900-02-27 | 1902-02-18 | George L Case | Back for stools. |
GB332759A (en) * | 1929-08-06 | 1930-07-31 | Frederick Hagger Headley | Improvements relating to chairs, seats and the like |
US2063732A (en) * | 1934-11-30 | 1936-12-08 | Florence L Gailey | Chair |
US2400630A (en) * | 1943-01-26 | 1946-05-21 | Roy A Cramer | Chair |
US2578879A (en) * | 1945-09-15 | 1951-12-18 | Sturgis Posture Chair Company | Adjustable bisectional back rest |
US2692012A (en) * | 1946-03-29 | 1954-10-19 | Cramer Posture Chair Co Inc | Adjustable chair back pivoted above seat |
US2756809A (en) * | 1954-06-30 | 1956-07-31 | Endresen Ernst | Back support for chairs, car seats, and the like |
US2767777A (en) * | 1954-07-26 | 1956-10-23 | Kriger Josephine | Adjustable back in a dual purpose chair structure |
US2812804A (en) * | 1954-08-16 | 1957-11-12 | Sandor Ralph | Adjustable back rest for seat |
US2843195A (en) * | 1956-01-25 | 1958-07-15 | Alvar E A Barvaeus | Self-adjusting back support |
-
1960
- 1960-04-13 DE DEB57483A patent/DE1221772B/en active Pending
-
1961
- 1961-05-08 CH CH540161A patent/CH413263A/en unknown
- 1961-05-09 GB GB16822/61A patent/GB925337A/en not_active Expired
- 1961-05-19 US US111322A patent/US3059971A/en not_active Expired - Lifetime
- 1961-05-29 FR FR863225A patent/FR1298392A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4744603A (en) * | 1986-04-10 | 1988-05-17 | Steelcase Inc. | Chair shell with selective back stiffening |
US5385388A (en) * | 1991-11-12 | 1995-01-31 | Steelcase Inc. | Split back chair |
Also Published As
Publication number | Publication date |
---|---|
FR1298392A (en) | 1962-07-13 |
DE1221772B (en) | 1966-07-28 |
US3059971A (en) | 1962-10-23 |
GB925337A (en) | 1963-05-08 |
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