US2859799A - Functional posture controller for chairs - Google Patents

Functional posture controller for chairs Download PDF

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Publication number
US2859799A
US2859799A US582390A US58239056A US2859799A US 2859799 A US2859799 A US 2859799A US 582390 A US582390 A US 582390A US 58239056 A US58239056 A US 58239056A US 2859799 A US2859799 A US 2859799A
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Prior art keywords
chair
member
seat
back
angular
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US582390A
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Edwin R Moore
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Edwin R Moore
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03294Reclining 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
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255Reclining 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
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266Reclining 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
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272Reclining 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
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S297/00Chairs and seats
    • Y10S297/04Wheelchair

Description

Nov. 11, 1958 E. R. MOORE 2,859,799

' FUNCTIONAL POSTURE CONTROLLER FOR CHAIRS 2 Sheets-Sheet 1 Filed May 3. 195a INVENTOR. EDWIN R. MOORE -ATTO RN EY Nov. 11, 1958 E. R. MOORE- FUNCTIONAL POSTURE CONTROLLER FOR CHAIRS 2 Sheet'sSheet 2 Filed May 5, 1956 m I; J 2/ 2:

1 I x INVENTORY EDWIN R. M0 0RE ATTORNEY United States Patent FUNCTIONAL POSTURE CONTROLLER FOR CHAIRS Edwin R. Moore, New York, N. Y. Application May 3, 1956, Serial No. 582,390 2 Claims. (cl. 155-47 My invention relates generally to chairs of the type having a tilting seat and back and in particular to a chair having seat and back elements which automatically adjust themselves relatively as the back is inclined, and commonly referred to as a posture chair, although the principle of my invention can be applied also to other devices. I

One object of the present invention is the provision of a device of the character described which affords related posture control in all positions of a chair wherein the seat and the back tilt at diiterent angles, so as to avoid that the tilting of the seat and back of the chair will cause a loss of posture fit or angular relation to the occupant while reclining. This feature of my invention also avoids the tendency of hitherto known similar chairs to pull out the occupants shirt with an opposing motion of the chair back when reclining Another object of the present invention is the provision of a device of the character described which is provided with a lever or hell crank arrangement that has a forward and backward moveability independent of the lowering and raising of the chair seat, and to which thecha'ir back is attached in such a manner as to give a unison relation with the occupants back, so that the chair back creepsforwardly whenrecli'ning, thus hugging the occupants back with angular relation, and synchro nizing all motions into one.

A further object of the present invention is the provision of a device of "the character described which has a contour adjusting dial built inside of an adjustment wheel for the tension of a spring that tends to hold the chair upright; by turning said dial said spring is collapsed to any desired position allowing the chair to assume any contour position, which remains relative to the occupants position at any adjustment in relation to the hip axis of the occupant.

Yet still another object of-the present invention is the provision of a device of the character described which has a new and improved adjustment nut design and arr angem en't on the swivel spindle, said nut being partially split into segments and tapered at the ends to conform to an adaptor collar. This arrangement will maintain a constant heighth of the chair seat, allows a finger touch adjustment "of the same when desired, and eliminates the need formilling out a long keyway groove in the-spindle, thusavoiding-awakening of the spindle and being more economical to manufacture than hitherto known similar constructions.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangements of parts without departing from the spirit of the invention as claimed.

In the accompanying drawing a preferred form of the invention has been shown.

2,859,799 Patented Nov. 11, 1958 ICC In said drawing:

Figure 1 is a side view of a preferred embodiment of my invention with the chair in an upright position;

Fig. 2 is a side view like Fig. 1, showing the chair in an inclined position;

Fig. 3 is an enlargedfractional sectional view on the line 3 -3 of Fig. 1; and,

Fig. 4 is a further enlarged fractional sectional view on the line 4'- 4 of Fig. 3

Similar reference characters refer to similar parts throughout the several views.

In the drawing the numeral 1 denotes a base or pedestal which has mounted on its top a disk 2 provided with a central bore 3 (Fig. 4) through which extends a bushing member 4. A chair spindle 5 extends through the member 4, and a heighth adjustment nut 7 is screwed upon the spindle 5. The nut 7 has an exterior annular groove 10, is partially split into segments by means of upright slots 11', and has a tapered lower end 14. A 'cap' member 15, through which extends the spindle 5, is firmly secured to the upper end of the nut 7 in such a manner that the nut 7 may be rotated relatively to the spindle 5 by turning the member 15. Thus the heighth of the chair can be finger-touch adjusted by turning the cap member 15. An adaptor collar 17, Which has a taper portion 20 corresponding to the taper lower end 14 of the nut 7, is interposed between the member 4 and the nut 7. The aforementioned partially segmental splitting of the nut 7 by means of the slots 11 and the taper portions 14 and 20 cause a clinching effect of the nut 7 on the spindle 5, due to the weight of the occupant of the chair as well as 'of those parts of the chair which are supported by thespindle 5. Thus the nut 7 will hold securely on the spindle 5 and swivel with the spindle 5, sodas to maintain a constant heighth of the chair, or allowing finger-touch adjustment by turning of the membeil15 as previously referred to. A screw 21, screwed through a lug. 22, which obliquely extends from the disk 2;:ehgags the annulargroove 10, so that the parts 5, 371-15 and 17 cannot be separated from the parts 1, 2 and 4 inadvertently. --1 iThe seat 23 of the chair is secured by any suitable means, for instance by means of screws 25 (Fig. 3) to a seat frame consisting preferably of a pair of parallel angle bars 24, which have registering slots 27. A swivel frame 30'has a pair 'of angular portions 31 which are joined to each other by means of cross portions 32 and 33';- The spindle 5 extends from the cross portion 33, to which it is firmly secured. The upper ends of the angular portions 31 of the swivel frame 30 are pivoted to the angle bars 24 at 35. Two pairs of link members 37. and 40 are'pivot'ed to the horizontal sections of the angular portions 31 of the frame 30 at 41 and 42 respectively. A substantially U-shaped member 43, which Basia pair of longitudinal flange portions 44 and a web portion 45' is mov'ably interposed with its 'flange portions 4.4 between :the 'bars24. -An up'right'member 47, which parries achair back 50, is firmly secured to the web portion 45 of the member 43 so as to form therewith an angular member. The upper ends of the link members 40 are pivoted at 51 to the outer ends of the flange portions 44, and a fulcrum cross rod 53 is extended traversely through the slots 27 in the bars 24 as well as through the upper ends of the link members 40 and the flange portions 44 of the member 43. Thus the member 43, together with the member 47 and the back 50, has a forward and backward moveability independent of the bars 24 and the chair seat 23 attached thereto. Spacing members 55, such as washers or the like, preferably are interposed between the bars 24 and the members 37,

and the rod 53 is slidable in the slots 27. Thus the fulcrum of the member 43, which is movable upwards and downwards as well as forwards and backwards, is pivotally attached to the bars 24 by means ofthe rod 53. J The slots 27 allow an independent forward and backward movement while lowering or rising the chair seat, as may be seen in Figs. 1 and 2. 7 The chair back 50 is attached by means of the member 47 to the member 43 about six inches back from the fulcrum, allowing sufficient leverage to drop the chair back 50 about one to one and one half inches more than the seat 23 drops in recline. This gives a unison relation with the occupants back. Moreover, due to the slots 27in the bars 24, the chair back 50 creeps forwardly in recline, hugging the occupants back with angular relation, and synchronizing all motions into one. To one side of the rim portion of a disk 54 are secured a pair oflugs 56, through which extends the rod 53. To the center portion of the disk 54 at the other side thereof is secured a tubular adaptor member 57, which has an internally threaded portion 60 (Fig. 4). The cross portion 33 of the swivel base has a threaded hole 61 through which is screwed the externally threaded tubular portion 62 of a hand wheel 63 for the adjustment of a coiled spring 64. The wheel 63 has a preferably cup-shaped portion 66, which encompasses substantially a contour adjusting circular dial member 67. To the center of the member 67 is secured a threaded bolt 70, which extends through a second disk 71 and through a portion of the spring 64, and is screwed into the threaded portion 60 of the member 57. A portion of the spring 64 encompasses the member 57, and the chair is held upright by the force of the spring 64 from the cross portion 33 of the frame 30 to the swinging fulcrum rod 53.

The contour adjusting dial member 67 is a specific feature of my invention. When the member 67 is turned in one direction the spring 64 is collapsed to any desired position, allowing the chair to assume any contour, which will remain relative to the posture for the occupant of the chair at any adjustment of axis location in relation to the hip axis of the occupant.

Since certain changes may be made in the above article and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are 7 intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which as a matter of language might be said to fall therebetween.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent is:

1. In a chair of the character described, the combination of a pedestal, a threaded post extending upwardly from said pedestal, a swivel frame having a pair of angular portions joined to each other by cross portions one of which is secured to said post, a seat frame having a pair of parallel portions pivoted to the outer ends of the angular portions of said swivel frame and provided with registering longitudinal slots, a chair seat carried by said seat frame, a chair back, an angular member having two branch portions to the first of which said chair back is secured while the second is extended between the parallel portions of said seat frame, a fulcrum rod extending through the slots in said seat frame and through the second branch portion of said angular member, a first pair of link members pivotably connecting said fulcrum rod to the angular portions of said swivel frame to which said seat frame is secured, a second pair of link members pivotably connecting the angular portions of said swivel frame to the outer end of the said branch portion of said angular member, resilient means interposed between said swivel frame and said fulcrum rod tending to hold said chair back upright 1 and said seat in a horizontal position, and adjustable means for limiting the expansion movement of said re silient means.

2. In a tilting chair, the combination of a pedestal, a post extending upwardly from said pedestal, a swivel frame having a pair of angular portions joined to each other by crossportions one of which is secured to said post, a seat frame having a pair of parallel portions pivoted to the outer ends of the angular portions of said swivel frame and provided with registering longitudinal slots, a chair seat carried by said seat frame, a chair back, an angular member having two branch portions to the first of which said chair back is secured while the second is extended between the parallel portions of said seat frame, a fulcrum rod extending through the slots in said seat frame and through the second branch portion of said angular member, a first pair of link members pivotably connecting said fulcrum rod to the angular portions of said swivel frame to which said seat frame is secured, a second pair of link members pivotably connecting the angular portions of said swivel frame to the outer end of the second branch portion of said angular member, resilient means interposed between said swivel frame and said fulcrum rod tending to hold said chair back upright and said seat horizontally, a hand wheel having an exteriorly threaded tubular portion screwed into a cross portion of said swivel frame, a threaded stem extending through the tubular portion of said hand Wheel, a circular operating member secured to one end of said stem, and an adaptor member pivoted to said fulcrum rod having a thread-ed portion into which said stem is screwed, so that the expansion movement of said resilient means can be adjusted by turning said hand wheel as well as by manipulating said threaded stem.

References Cited in the file of this patent UNITED STATES PATENTS 1,872,894 Collier et al Aug. 23, 1932 1,928,801 Uhl Oct. 3, 1933 2,321,385 Herold June 8, 1943 2,403,198 Sheldrick et a1 July 2, 1946 2,403,425 Bolens July 2, 1946 2,420,745 Harman May 20, 1947 2,447,601 Sengpiel Aug. 24, 1948 2,471,024 Cramer May 24, 1949 2,545,950 Fox Mar. 20, 1951

US582390A 1956-05-03 1956-05-03 Functional posture controller for chairs Expired - Lifetime US2859799A (en)

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US582390A US2859799A (en) 1956-05-03 1956-05-03 Functional posture controller for chairs
GB1404657A GB848092A (en) 1956-05-03 1957-05-02 Improvements in adjustable chairs
FR1174489D FR1174489A (en) 1956-05-03 1957-05-03 office chair and rocking back

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Cited By (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059888A (en) * 1960-02-26 1962-10-23 Lie Finn Rotary seat construction having novel bearing means therein
US3161396A (en) * 1963-09-05 1964-12-15 Collier Keyworth Company Swivel chair support construction
US3594040A (en) * 1968-12-31 1971-07-20 Edwin P Monroe Suspension device
US3620568A (en) * 1969-06-26 1971-11-16 Boeing Co Aircraft crewseat
US3947067A (en) * 1972-05-03 1976-03-30 Stanzwerk Peitz & Co. Chair
US3953054A (en) * 1973-03-19 1976-04-27 Permobilstiftelsen Hand operated wheel-chair
FR2438990A1 (en) * 1978-10-20 1980-05-16 Protoned Bv ergonomic chair
US4471994A (en) * 1981-03-17 1984-09-18 Fa. Karl Zund & Co., AG Adjustable chair
US4596421A (en) * 1983-01-21 1986-06-24 Pierre Schmitz Office chair
US4629249A (en) * 1984-01-18 1986-12-16 Okamura Corporation Device for a reclining chair
US4652050A (en) * 1984-01-11 1987-03-24 Herman Miller, Inc. Chair tilt mechanism
US4682814A (en) * 1983-05-06 1987-07-28 Provenda Marketing Ag Tilting seat and back chair, particularly tilting desk chair
US4707029A (en) * 1985-08-07 1987-11-17 Roder Gmbh Sitzmobelworke Apparatus for supporting parts of furniture
US4718725A (en) * 1985-08-02 1988-01-12 Firma August Froscher G.M.B.H. & Co. K.G. Support-and adjusting device for seat and backrest on a work chair
US4761033A (en) * 1986-05-26 1988-08-02 Drabert Sohne Gmbh & Co. Chair
AT386517B (en) * 1987-02-10 1988-09-12 Zuend & Co Ag K Chair, in particular working chair
US4796952A (en) * 1986-06-12 1989-01-10 Giancarlo Piretti Chair with hinged backrest
US4854641A (en) * 1989-01-23 1989-08-08 Reineman Richard G Adjustable chair
US4948198A (en) * 1988-10-14 1990-08-14 Leggett & Platt, Incorporated Knee-tilt chair control
US4966412A (en) * 1984-10-24 1990-10-30 Burositzmobelfabrik Friedrich-W. Dauphin Gmbh & Co. Chair, in particular office chair
EP0406707A1 (en) * 1989-07-01 1991-01-09 KÖNIG & NEURATH KG Office chair with seat and backrest
US5263767A (en) * 1990-02-28 1993-11-23 Svein Asbjornsen Adjustable chair
US5318345A (en) * 1991-06-07 1994-06-07 Hon Industries, Inc. Tilt back chair and control
US5388889A (en) * 1993-09-23 1995-02-14 Westinghouse Electric Corporation Torque control mechanism for chairs
US5397165A (en) * 1992-10-20 1995-03-14 Paltechnica Nitzanim Synchronous movement adjustable seat support
US5423594A (en) * 1991-05-21 1995-06-13 Ashfield Engineering Company Wexford Limited Chair tilting mechanism
US5725277A (en) * 1986-04-10 1998-03-10 Steelcase Inc. Synchrotilt chair
US5931531A (en) * 1997-01-23 1999-08-03 Comforto Gmbh Chair having adjustable synchronous tilting
WO2002024515A2 (en) * 2000-09-21 2002-03-28 G & W Products, Inc. Quick-mount and pivot base for bicycle seat or the like
US6386634B1 (en) 1992-06-15 2002-05-14 Herman Miller, Inc. Office chair
US6513874B1 (en) * 1999-06-17 2003-02-04 Konig & Neurath Ag Chair, especially office chair
US6709058B1 (en) 1999-04-09 2004-03-23 Humanscale Corp. Ergonomic chair
EP1419718A1 (en) * 2002-11-14 2004-05-19 Hodry Metallwarenfabrik R.Hoppe Ges.m.b.H & Co. KG Mounting for television chair
US20050029849A1 (en) * 2003-06-23 2005-02-10 Goetz Mark W. Tilt chair
US6942290B1 (en) 2000-09-21 2005-09-13 G & W Products, Inc. Quick-mount and pivot base for bicycle seat or the like
US20050264087A1 (en) * 2004-05-13 2005-12-01 Humanscale Corporation Mesh chair component
US20050275265A1 (en) * 2004-06-09 2005-12-15 Deimen Michael L Chair ride mechanism with tension assembly
US20060181128A1 (en) * 2005-02-02 2006-08-17 Hiroshi Takeuchi Chair and support mechanism unit thereof
US20070001497A1 (en) * 2005-06-20 2007-01-04 Humanscale Corporation Seating apparatus with reclining movement
US20100164263A1 (en) * 2007-06-06 2010-07-01 Malenotti S.R.L. Chair with oscillating backrest
US20100308633A1 (en) * 2007-10-30 2010-12-09 Donati S.P.A. mechanism for adjusting the pre-load of a stiffening spring for seats
US20110304192A1 (en) * 2010-06-15 2011-12-15 Augustat Betty A Ergometric Chair Apparatus
USD660056S1 (en) 2006-06-20 2012-05-22 Humanscale Corporation Chair
USD673401S1 (en) 2005-05-13 2013-01-01 Humanscale Corporation Chair support structure
US9352675B2 (en) 2011-09-21 2016-05-31 Herman Miller, Inc. Bi-level headrest, body support structure and method of supporting a user's cranium
US9504326B1 (en) 2012-04-10 2016-11-29 Humanscale Corporation Reclining chair
US9801471B2 (en) 2014-04-17 2017-10-31 Hni Technologies Inc. Chair and chair control assemblies, systems, and methods
IT201600071468A1 (en) * 2016-07-08 2018-01-08 Co Fe Mo Ind S R L Tilting mechanism for chairs

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US4429917A (en) * 1981-04-29 1984-02-07 Hauserman Inc. Int. Furniture & Textile Division Chair
DE3619312C1 (en) * 1986-06-07 1988-01-14 Kusch Co Sitzmoebel Tilt mechanism for SITZMOEBEL
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SE501399C2 (en) * 1994-03-14 1995-02-06 Samhall Kalmarsund Ab Sliding mechanism for horizontal displacement of a chair seat
US6139103A (en) * 1997-03-12 2000-10-31 Leggett & Platt, Inc. Synchronized chair seat and backrest tilt control mechanism

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US1872894A (en) * 1930-05-13 1932-08-23 Collier Keyworth Company Chair iron
US1928801A (en) * 1931-05-15 1933-10-03 Toledo Metal Furniture Company Article of furniture
US2321385A (en) * 1941-06-16 1943-06-08 Sikes Company Tilting chair
US2403425A (en) * 1942-02-16 1946-07-02 Seng Co Tiltable chair
US2420745A (en) * 1944-03-06 1947-05-20 Frank B Harman Posture chair
US2403198A (en) * 1944-06-06 1946-07-02 Collier Keyworth Company Chair iron
US2447601A (en) * 1946-02-19 1948-08-24 Sikes Company Tilting chair seat and back rest
US2471024A (en) * 1946-10-04 1949-05-24 Roy A Cramer Chair with tilting back and automatically shiftable seat
US2545950A (en) * 1946-12-06 1951-03-20 Seng Co Swivel chair iron

Cited By (73)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059888A (en) * 1960-02-26 1962-10-23 Lie Finn Rotary seat construction having novel bearing means therein
US3161396A (en) * 1963-09-05 1964-12-15 Collier Keyworth Company Swivel chair support construction
US3594040A (en) * 1968-12-31 1971-07-20 Edwin P Monroe Suspension device
US3620568A (en) * 1969-06-26 1971-11-16 Boeing Co Aircraft crewseat
US3947067A (en) * 1972-05-03 1976-03-30 Stanzwerk Peitz & Co. Chair
US3953054A (en) * 1973-03-19 1976-04-27 Permobilstiftelsen Hand operated wheel-chair
FR2438990A1 (en) * 1978-10-20 1980-05-16 Protoned Bv ergonomic chair
US4471994A (en) * 1981-03-17 1984-09-18 Fa. Karl Zund & Co., AG Adjustable chair
US4596421A (en) * 1983-01-21 1986-06-24 Pierre Schmitz Office chair
US4682814A (en) * 1983-05-06 1987-07-28 Provenda Marketing Ag Tilting seat and back chair, particularly tilting desk chair
US4652050A (en) * 1984-01-11 1987-03-24 Herman Miller, Inc. Chair tilt mechanism
US4629249A (en) * 1984-01-18 1986-12-16 Okamura Corporation Device for a reclining chair
US4966412A (en) * 1984-10-24 1990-10-30 Burositzmobelfabrik Friedrich-W. Dauphin Gmbh & Co. Chair, in particular office chair
US4718725A (en) * 1985-08-02 1988-01-12 Firma August Froscher G.M.B.H. & Co. K.G. Support-and adjusting device for seat and backrest on a work chair
AU598473B2 (en) * 1985-08-02 1990-06-28 August Froscher G.M.B.H. & Co. K.G. Support- and adjusting device for seat and backrest on a work chair
US4707029A (en) * 1985-08-07 1987-11-17 Roder Gmbh Sitzmobelworke Apparatus for supporting parts of furniture
US5725277A (en) * 1986-04-10 1998-03-10 Steelcase Inc. Synchrotilt chair
US4761033A (en) * 1986-05-26 1988-08-02 Drabert Sohne Gmbh & Co. Chair
US4796952A (en) * 1986-06-12 1989-01-10 Giancarlo Piretti Chair with hinged backrest
AT386517B (en) * 1987-02-10 1988-09-12 Zuend & Co Ag K Chair, in particular working chair
US4832402A (en) * 1987-02-10 1989-05-23 Karl Zund & Co. AG Adjusting mechanism for a chair
US4948198A (en) * 1988-10-14 1990-08-14 Leggett & Platt, Incorporated Knee-tilt chair control
US4854641A (en) * 1989-01-23 1989-08-08 Reineman Richard G Adjustable chair
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Also Published As

Publication number Publication date
FR1174489A (en) 1959-03-11
GB848092A (en) 1960-09-14

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