US3369840A - Chair tilting mechanism - Google Patents

Chair tilting mechanism Download PDF

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Publication number
US3369840A
US3369840A US56720966A US3369840A US 3369840 A US3369840 A US 3369840A US 56720966 A US56720966 A US 56720966A US 3369840 A US3369840 A US 3369840A
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portion
spring
leaf
back
rest
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Expired - Lifetime
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Dufton Ronald
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DARE INGLIS PRODUCTS Ltd
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DARE INGLIS PRODUCTS Ltd
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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 adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261Reclining or easy chairs having coupled adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03277Reclining or easy chairs having coupled adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with leaf springs
    • 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 adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255Reclining or easy chairs having coupled 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 adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261Reclining or easy chairs having coupled adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266Reclining or easy chairs having coupled adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity

Description

1 Feb. 20, 1968 R. DUFTON v 3,369,840

CHAIR TILTING MECHANISM Filed July 22, 1966 2 Sheets-Sheet 1 y 764 55 40 M a /5@ I nvenlor Ronald Dufton MISEGADES 8c DOUGLAS Attorney United States Patent 3,369,840 CHAIR TILTING MECHANISM Ronald Dufton, Bushey Heath, England, assignor to Dare-Inglis Products Limited, Harrow, Middlesex, England, a British company Filed July 22, 1966, Ser. No. 567,209 Claims priority, application Great Britain, July 23, 1965, 31,603/ 65 7 Claims. (Cl. 297-303) ABSTRACT OF THE DISCLOSURE A chair tilting mechanism comprising a base portion, a seat portion, a back-rest portion pivotally connected to the base portion, an elongated leaf spring mounted transversely of the pivot axis between the base and back-rest portions to resist pivotal movement therebetween; a tension adjustment device connecting the forward end of the leaf spring to the base portion, the rearward end of the leaf spring engaging the back-rest portion; an abutment pivotally mounted on the base portion engaging the leaf spring substantially at the center thereof to effect bowing of the leaf spring.

This invention concerns a chair tilting mechanism.

The principal object of the invention is the provision of an improved chair tilting mechanism which is robust and occupies less vertical space and may thus be housed conveniently beneath the seat portion of the chair.

Such chair tilting mechanisms have theretofore comprised structures employing a leaf spring having a free end and about whose other end the spring bends to provide the necessary resilience for the structure.

The improved chair tilting mechanism of the present invention differs in structure and action from such leaf spring structures as have heretofore been known in that the resiliency of the mechanism is produced by bowing the leaf spring at its center. Thus either end of the spring is completely free and so there is less tendency for the spring to fracture and the mechanism occupies less vertical space.

According to the present invention there is provided a chair tilting mechanism comprising a base portion, a seat portion, a back-rest portion, means connected to the backrest portion, means pivotally connecting the back-rest portion to the base portion, an elongated leaf spring mounted transversely of the pivot axis between the base and backrest portions and adapted to resist pivotal movement therebetween, a tension adjustment device for varying the residual tension in the spring, the forward end of the leaf spring being connected to the base portion by way of the tension adjustment device, the rearward end of the leaf spring engaging the means connected to the back-rest portion, and an abutment pivotally mounted on the base portion which engage the leaf spring substantially at the center thereof to effect bowing of the leaf spring.

The seat portion and back-rest portion may be pivotally connected as a unit to the base portion.

Alternatively the seat and back-rest portions may be pivotally connected to the base portion in such a way as to permit the back-rest portion to be pivoted with respect to the base portion to a greater extent than the seat portion. Thus the locus of movement of the back-rest portion may have a smaller radius than that of the locus of movement of the seat portion.

The base portion may comprise a cradle which is rotatably mounted on a pillar. The back-rest portion is preferably pivotally connected to the cradle about an axis disposed to the rear of the pillar.

The seat portion may be pivotally connected to the "ice cradle forwardly of the pillar and is connected by linkage means to the back-rest portion.

The invention is illustrated; namely by way of example, in the accompanying drawings, in which:

FIGURE 1 is a part-sectional elevation of a chair according to the present invention,

FIGURE 2 is a part-sectional elevation of part of the chair shown in FIGURE 1,

FIGURE 3 is a part-sectional elevation of a modified form of chair according to the present invention,

FIGURE 4 is a view similar to FIGURE 3 with the components in a different relative position, and

FIGURE 5 is a part cut-away perspective view of part of the chair shown in FIGURES 3 and 4.

In FIGURE 1 there is shown an ofiice chair comprising a seat portion 11 and a back-seat portion 12 attached to the seat portion 11. The seat portion 11 is provided, on its underside and somewhat to the rear of the centre thereof, with brackets 13. The brackets 13 are pivoted by a common pivot 14 to a cradle 15 which is rotatably mounted on the central stem 16 of a pillar type base for the chair, the cradle 15 and stem 16 forming the base portion of a tilting mechanism permitting tilting of the back-rest 12. As will be seen, the pivot 14 is disposed somewhat to the rear of the stem 16. Attached to an extension arm 17 of the cradle is a tension adjustment device 18, shown in more detail in FIGURE 2, which cooperates with the forward end 19 of a laminated leaf spring 20. The leaf spring 20 is elongate, the forward end 19 of the leaf spring 20 being adjacent a pivot pin 21 at the extreme forward end of cradle 15, while the rearward end 22 of the leaf spring 20 engages a pivot pin 23 adjacent the rear of the seat portion 11. The leaf spring 20 is thus mounted transversely of the pivot 14 which forms the pivot axis between the back-rest portion 12 and the cradle 15. The pivot pin 23 is attached to bosses 24 on the underside of the seat portion 11 adjacent its rear end.

An abutment 25, which is pivoted to the cradle 15 on a pivot 26, bears against the underside of the leaf spring 20 adjacent its centre between the ends 19, 22 to elfect bowing of the leaf spring 20.

It will be appreciated that, when not in use, the leaf spring 20 will be almost linear with the seat portion 11 positioned substantially horizontally. In use, however, the

seat portion 11 and back-rest portion 12 will tilt rearwardly about the pivot 14 to the position shown, for example, in FIGURE 1, and will effect flexing of the leaf spring 20 by engagement between the pivot 23 and the rearward end 22 of the leaf spring 20. The leaf spring 20 will bow in the manner shown, since it is effectively fixed with respect to the cradle 15, due to tension adjustment device 18 or, if device 18 is slack, due to pivot pin 21, and the abutment 25 will resist movement of the leaf spring 20, but will permit bowing thereof, such that the tensioning of the leaf spring 20 will resist the tilting action of the chair. It will be appreciated that the back-rest portion 12 will tilt with the seat portion 11 and to the same extent.

Referring now to FIGURE 2., the tension adjustment device 18 is shown in more detail. It will be seen that the forward end 19 of the leaf spring 20 is provided with a central aperture 27 within which there is disposed a screwthreaded bolt 28, the head 29 of which is too large to pass through the aperture 27 and thus rests on the upper surface of the leaf spring 20. The screw threaded bolt 28 passes through an aperture 30 in the arm 17 and is provided on the underside of the arm 17 with a nut 31 having an axial projection 32 which engages the undersurface of the arm 17, so that rotation of the nut 31 adjusts the position of the head 29 of the bolt 28. Thus by rotating the nut 31, the head 29 of the bolt 28 can be moved vertically so as to draw the end 19 of the leaf spring 20 into the broken-line position indicated at 19' to thereby pre-tension the leaf spring 20 so that it provides greater resistance to tilting action of the chair. Thus the tension in the leaf spring 20 can be adjusted to suit the weight of the person using the chair. When the tension adjustment device 18 is very slack, the pivot pin 21 provides the restraining force on the upper side of the end 19 of the leaf spring 20 during tilting of the chair. At other times, the head 29 provides the restraining force.

Referring now to the embodiment shown in FIGURES 3 to 5, there is shown a somewhat modified and preferred form of chair which provides a tilting action similar to that provided by the arrangement of FIGURE 1, but also provides for relative movement between the back-rest and seat portions. In view of the similarity between the construction of FIGURES 3 to and that of FIGURES 1 and 2, similar components have been allocated similar reference numerals with the addition of the reference letter a.

Referring to FIGURES 3 to 5, it will be seen that seat portion 11a is pivoted to cradle a at 21a and not at 14a, and thus is pivoted thereto forwardly of the stem 16. Back-rest 12a is connected at 34- to two integral arms 35, 36 which are disposed on opposite sides of cradle 15a and are pivoted thereto by the pivot 14a. Arms 35, 36 are pivoted intermediate the ends thereof to links 40, 41 respectively which in turn are pivoted to the seat portion 11a at opposite ends of the pivot 23a. Thus the rearward end of the leaf spring a controls the position of the back-rest portion 12a by engaging the pivot 23a which is connected to the back-rest portion 12a by the links 40, 41 and the arms 35, 36.

It will be appreciated that the back-rest portion 12a is adapted to pivot about pivot 14a and, as clearly indicated in FIGURE 3, the are x which defines the locus of movement of the back-rest portion 12a has a smaller radius than the arc y which defines the locus of the movement of the seat portion 11a. Thus, upon pivotal movement of seat portion 11a from the position indicated in FIGURE 3, to the position indicated in FIGURE 4, a pivotal movement of the seat portion 11a through an angle a will result in pivotal movement of the back-rest 12a through an angle a-i-B, where ,8 is the angle between the seat portion 11a and the arms 35, 36.

The use of an elongate resilient leaf spring 20 in the tilting mechanism allows the latter to be made very compact so as to save height.

Although shown as a multi-leaf spring, the leaf spring 20 can, of course, be a single leaf. It will be appreciated that, in the embodiments of both FIGURES l and 2 and FIGURES 3 to 5, the forward end 19 of the leaf spring will be acted upon by the pivot pin 21 (or 21a) when the tension adjustment device 18, 18a is slackened off, but, whether the pivot pin 21, 21a or tension adjustment device 18, 18a acts on the end 19 of the spring, the end 19 of the spring can still be considered as being fixed relative to the cradle 15 of the base portion of the seat.

In the particular embodiments described above, the seat portion 11, or 11a and the back-rest portion 12 or 12a are upholstered. It will, however, be appreciated that the terms seat portion and back-rest portion can refer, and are intended to include within their scope, the frames only for the seat and back-rest, i.e. as shown in FIGURE 4. The frame for the seat portion, moreover, may be removable without such removal affecting the operating of the tilting mechanism.

I claim:

1. A chair tilting mechanism comprising a base portion, a seat portion, a back-rest portion, means connected to the back-rest portion, means pivotally connecting the back-rest portion to the base portion, an elongated leaf spring mounted transversely of the pivot axis between the base and back-rest portions and adapted to resist pivotal movement therebetween, a tension adjustment device for varying the residual tension in the spring, the forward end of the leaf spring being connected to the base portion by way of the tension adjustment device, the rearward end of the leaf spring engaging the means connected to the back-rest portion, and an abutment pivotally mounted on the base portion which engages the leaf spring substantially at the center thereof to effect bowing of the leaf spring.

2. A mechanism as claimed in claim 1 in which the seat portion and back-rest portion are pivotally connected as a unit to the base portion.

3. A mechanism as claimed in claim 1 in which the seat and back-rest portions are both pivotally connected to the base portion to permit the back-rest to be pivoted with respect to the base portion to a greater extent than the seat portion.

4. A mechanism as claimed in claim 3 in which the locus of movement of the back-rest portion has a smaller radius than that of the locus of movement of the seat portion.

5. A mechanism as claimed in claim 3 in which the base portion comprises a cradle which is rotatably mounted on a pillar.

6. A mechanism as claimed in claim 5 in which the back-rest portion is pivotally connected to the cradle about an axis disposed to the rear of the pillar.

'7. A mechanism as claimed in claim 5 in which the seat portion is pivotally connected to the cradle forwardly of the pillar and is connected by linkage means to the back-rest portion.

References Cited UNITED STATES PATENTS 2,313,559 3/1943 Larsen et al 297302 2,528,223 10/1950 Fox 297301 2,818,911 l/1958 Syak 297303 X 2,956,619 10/1960 Scherer 297303 3,290,091 12/1966 Goodman 297302 BOBBY R. GAY, Primary Examiner.

DAVID J. WILLIAMOWSKY, Examiner.

G. O. FINCH, Assistant Examiner.

US3369840A 1965-07-23 1966-07-22 Chair tilting mechanism Expired - Lifetime US3369840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3160365A GB1109551A (en) 1965-07-23 1965-07-23 Tilting chair mechanism

Publications (1)

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US3369840A true US3369840A (en) 1968-02-20

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US3369840A Expired - Lifetime US3369840A (en) 1965-07-23 1966-07-22 Chair tilting mechanism

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US (1) US3369840A (en)
CA (1) CA806983A (en)
DE (1) DE1297306B (en)
GB (1) GB1109551A (en)
NL (1) NL6609726A (en)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603641A (en) * 1969-09-12 1971-09-07 La Z Boy Chair Co Office-type chair
US4077596A (en) * 1975-06-18 1978-03-07 Bliss & Laughlin Industries, Incorporated Low silhouette chair tilting control assembly
DE3101692A1 (en) * 1981-01-21 1982-08-19 Dauphin F W Buerositzmoebel "SITZMOEBEL, particularly revolving office chair"
EP0242140A2 (en) * 1986-04-10 1987-10-21 Steelcase Inc. Integrated chair and control
DE3638273A1 (en) * 1986-10-13 1988-04-21 Thonet Geb Gmbh Piece of seating furniture
US4773706A (en) * 1986-07-03 1988-09-27 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Chair, particularly an office chair
FR2648337A1 (en) * 1989-06-09 1990-12-21 Harter Corp A suspension mechanism for connecting the backrest and seat of a seat has an underframe
WO1993013695A1 (en) * 1992-01-15 1993-07-22 Lavaco Industries, Inc. Resilient chair support
WO1993019644A1 (en) * 1992-03-28 1993-10-14 Martin Stoll Gmbh Chair
US5725277A (en) * 1986-04-10 1998-03-10 Steelcase Inc. Synchrotilt chair
US6250715B1 (en) 1998-01-21 2001-06-26 Herman Miller, Inc. Chair
US20030193227A1 (en) * 1997-10-24 2003-10-16 Dekraker Larry Seating unit with variable back stop and seat bias
EP1342432A3 (en) * 2002-03-05 2004-01-28 Eckhard Dipl.-Ing. Hansen Chair
US6688688B2 (en) * 2000-05-27 2004-02-10 Peter Roeder Chair
US6692075B2 (en) * 2001-05-11 2004-02-17 Armin Sander Chair having a synchronously adjustable seat and backrest
EP1419718A1 (en) * 2002-11-14 2004-05-19 Hodry Metallwarenfabrik R.Hoppe Ges.m.b.H & Co. KG Mounting for television chair
EP1449462A1 (en) * 2003-02-18 2004-08-25 Eckhard Dipl.-Ing. Hansen Chair
US20040245839A1 (en) * 2002-09-12 2004-12-09 Bodnar David A. Combined tension and back stop function for seating unit
US20050275263A1 (en) * 2004-06-10 2005-12-15 Norman Christopher J Back construction with flexible lumbar
US20050275264A1 (en) * 2004-06-10 2005-12-15 Norman Christopher J Back construction with flexible lumbar
US20090044820A1 (en) * 2007-08-19 2009-02-19 Anastasia Soare Stencils and gauging device for aesthetically pleasing eyebrow shaping
US7540465B1 (en) 2002-03-08 2009-06-02 Miller Charles A Shock absorbing motor mount for vibratory belt drive
US7806478B1 (en) * 2006-01-04 2010-10-05 Sava Cvek Task chair with dual tilting capabilities
US7922248B2 (en) 2007-01-29 2011-04-12 Herman Miller, Inc. Seating structure and methods for the use thereof
US8714645B2 (en) 2010-01-28 2014-05-06 Sava Cvek Pivoting mechanism with gross and fine resistance adjustment
WO2014166808A1 (en) * 2013-04-08 2014-10-16 Johann Burkhard Schmitz Mechanical subassembly for a chair and chair having such a mechanical subassembly
WO2014166804A1 (en) * 2013-04-08 2014-10-16 Johann Burkhard Schmitz Mechanical subassembly for a chair and chair having such a mechanical subassembly
US20160113399A1 (en) * 2013-05-11 2016-04-28 Bock 1 Gmbh & Co., Kg Synchronizing mechanism
US9622581B2 (en) 2010-02-08 2017-04-18 Sava Cvek Mobile task chair and mobile task chair control mechanism with adjustment capabilities and visual setting indicators
US9706845B2 (en) 2012-09-20 2017-07-18 Steelcase Inc. Chair assembly
US9801471B2 (en) 2014-04-17 2017-10-31 Hni Technologies Inc. Chair and chair control assemblies, systems, and methods

Families Citing this family (6)

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DE2733322C3 (en) * 1977-07-23 1980-08-07 Protoned B.V., Amsterdam
JPS59207112A (en) * 1983-05-10 1984-11-24 Meekoo Kogyo Kk Chair
GB8415796D0 (en) * 1983-06-28 1984-07-25 Parker & Co High Wycombe Ltd A Forward tilting chair
DE3616475C1 (en) * 1986-05-15 1987-06-11 Kusch Co Sitzmoebel Height adjustable, equipped with gas lift swivel chair, in particular office chair or armchairs
GB2264862B (en) * 1992-03-10 1996-02-14 Ashfield Eng Co Wexford Ltd A chair tilting mechanism
DE4306970C2 (en) * 1993-03-05 1995-05-04 Drabert Soehne Seating furniture, in particular office chair

Citations (5)

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Publication number Priority date Publication date Assignee Title
US2313559A (en) * 1940-06-28 1943-03-09 Heywood Wakefield Co Chair
US2528223A (en) * 1946-11-29 1950-10-31 Seng Co Chair iron
US2818911A (en) * 1954-11-05 1958-01-07 Trumbull Dev Corp Tiltable office chair
US2956619A (en) * 1958-10-03 1960-10-18 Cramer Posture Chair Company I Tilt back chair
US3290091A (en) * 1966-01-14 1966-12-06 Goodman Robert Chairs with tiltable portions

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FR1405941A (en) * 1964-06-02 1965-07-16 Fond Manil S A rocker assembly pivotably and height adjustable

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313559A (en) * 1940-06-28 1943-03-09 Heywood Wakefield Co Chair
US2528223A (en) * 1946-11-29 1950-10-31 Seng Co Chair iron
US2818911A (en) * 1954-11-05 1958-01-07 Trumbull Dev Corp Tiltable office chair
US2956619A (en) * 1958-10-03 1960-10-18 Cramer Posture Chair Company I Tilt back chair
US3290091A (en) * 1966-01-14 1966-12-06 Goodman Robert Chairs with tiltable portions

Cited By (56)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603641A (en) * 1969-09-12 1971-09-07 La Z Boy Chair Co Office-type chair
US4077596A (en) * 1975-06-18 1978-03-07 Bliss & Laughlin Industries, Incorporated Low silhouette chair tilting control assembly
DE3101692A1 (en) * 1981-01-21 1982-08-19 Dauphin F W Buerositzmoebel "SITZMOEBEL, particularly revolving office chair"
EP0242140A2 (en) * 1986-04-10 1987-10-21 Steelcase Inc. Integrated chair and control
EP0242140A3 (en) * 1986-04-10 1988-01-13 Steelcase Inc. Integrated chair and control
US5725277A (en) * 1986-04-10 1998-03-10 Steelcase Inc. Synchrotilt chair
US4773706A (en) * 1986-07-03 1988-09-27 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Chair, particularly an office chair
DE3638273A1 (en) * 1986-10-13 1988-04-21 Thonet Geb Gmbh Piece of seating furniture
FR2648337A1 (en) * 1989-06-09 1990-12-21 Harter Corp A suspension mechanism for connecting the backrest and seat of a seat has an underframe
WO1993013695A1 (en) * 1992-01-15 1993-07-22 Lavaco Industries, Inc. Resilient chair support
US5267777A (en) * 1992-01-15 1993-12-07 Lavaco Industries, Inc. Resilient chair support
WO1993019644A1 (en) * 1992-03-28 1993-10-14 Martin Stoll Gmbh Chair
US20050046254A1 (en) * 1997-10-24 2005-03-03 Knoblock Glenn A. Chair having reclineable back and movable seat
US6991291B2 (en) 1997-10-24 2006-01-31 Steelcase Development Corporation Back construction for seating unit having spring bias
US20030193227A1 (en) * 1997-10-24 2003-10-16 Dekraker Larry Seating unit with variable back stop and seat bias
US20070024098A1 (en) * 1997-10-24 2007-02-01 Knoblock Glenn A Back construction for seating unit
US7040709B2 (en) 1997-10-24 2006-05-09 Steelcase Development Corporation Back construction for seating unit having inverted U-shaped frame
US7131700B2 (en) 1997-10-24 2006-11-07 Steelcase Development Corporation Back construction for seating unit
US20050231013A1 (en) * 1997-10-24 2005-10-20 Knoblock Glenn A Back construction for seating unit
US7427105B2 (en) 1997-10-24 2008-09-23 Steelcase Inc. Back construction for seating unit
US6817668B2 (en) 1997-10-24 2004-11-16 Steelcase Development Corporation Seating unit with variable back stop and seat bias
US20050179292A1 (en) * 1997-10-24 2005-08-18 Knoblock Glenn A. Back construction for seating unit having inverted U-shaped frame
US20050127729A1 (en) * 1997-10-24 2005-06-16 Knoblock Glenn A. Back construction for seating unit having spring bias
US7114777B2 (en) 1997-10-24 2006-10-03 Steelcase Development Corporation Chair having reclineable back and movable seat
US6367876B2 (en) 1998-01-21 2002-04-09 Herman Miller, Inc. Chair
US20050017557A1 (en) * 1998-01-21 2005-01-27 Herman Miller, Inc. Chair
US6250715B1 (en) 1998-01-21 2001-06-26 Herman Miller, Inc. Chair
US7004543B2 (en) 1998-01-21 2006-02-28 Herman Miller, Inc. Chair
US6688688B2 (en) * 2000-05-27 2004-02-10 Peter Roeder Chair
US6692075B2 (en) * 2001-05-11 2004-02-17 Armin Sander Chair having a synchronously adjustable seat and backrest
EP1342432A3 (en) * 2002-03-05 2004-01-28 Eckhard Dipl.-Ing. Hansen Chair
US7540465B1 (en) 2002-03-08 2009-06-02 Miller Charles A Shock absorbing motor mount for vibratory belt drive
US6880886B2 (en) 2002-09-12 2005-04-19 Steelcase Development Corporation Combined tension and back stop function for seating unit
US20040245839A1 (en) * 2002-09-12 2004-12-09 Bodnar David A. Combined tension and back stop function for seating unit
US7165811B2 (en) 2002-09-12 2007-01-23 Steelcase Development Corporation Control mechanism for seating unit
EP1419718A1 (en) * 2002-11-14 2004-05-19 Hodry Metallwarenfabrik R.Hoppe Ges.m.b.H & Co. KG Mounting for television chair
EP1449462A1 (en) * 2003-02-18 2004-08-25 Eckhard Dipl.-Ing. Hansen Chair
US20050275264A1 (en) * 2004-06-10 2005-12-15 Norman Christopher J Back construction with flexible lumbar
US7237841B2 (en) 2004-06-10 2007-07-03 Steelcase Development Corporation Back construction with flexible lumbar
US7458637B2 (en) 2004-06-10 2008-12-02 Steelcase Inc. Back construction with flexible lumbar
US20050275263A1 (en) * 2004-06-10 2005-12-15 Norman Christopher J Back construction with flexible lumbar
US7806478B1 (en) * 2006-01-04 2010-10-05 Sava Cvek Task chair with dual tilting capabilities
US8262162B2 (en) * 2007-01-29 2012-09-11 Herman Miller, Inc. Biasing mechanism for a seating structure and methods for the use thereof
US8419133B2 (en) 2007-01-29 2013-04-16 Herman Miller, Inc. Seating structure with independently adjustable back
US7922248B2 (en) 2007-01-29 2011-04-12 Herman Miller, Inc. Seating structure and methods for the use thereof
US20110241399A1 (en) * 2007-01-29 2011-10-06 Castro Jr Elindo G Biasing mechanism for a seating structure and methods for the use thereof
US8210611B2 (en) 2007-01-29 2012-07-03 Herman Miller, Inc. Seating structure and methods for the use thereof
US20090044820A1 (en) * 2007-08-19 2009-02-19 Anastasia Soare Stencils and gauging device for aesthetically pleasing eyebrow shaping
US8714645B2 (en) 2010-01-28 2014-05-06 Sava Cvek Pivoting mechanism with gross and fine resistance adjustment
US9625015B2 (en) 2010-01-28 2017-04-18 Sava Cvek Pivoting mechanism with gross and fine resistance adjustment
US9622581B2 (en) 2010-02-08 2017-04-18 Sava Cvek Mobile task chair and mobile task chair control mechanism with adjustment capabilities and visual setting indicators
US9706845B2 (en) 2012-09-20 2017-07-18 Steelcase Inc. Chair assembly
WO2014166804A1 (en) * 2013-04-08 2014-10-16 Johann Burkhard Schmitz Mechanical subassembly for a chair and chair having such a mechanical subassembly
WO2014166808A1 (en) * 2013-04-08 2014-10-16 Johann Burkhard Schmitz Mechanical subassembly for a chair and chair having such a mechanical subassembly
US20160113399A1 (en) * 2013-05-11 2016-04-28 Bock 1 Gmbh & Co., Kg Synchronizing mechanism
US9801471B2 (en) 2014-04-17 2017-10-31 Hni Technologies Inc. Chair and chair control assemblies, systems, and methods

Also Published As

Publication number Publication date Type
DE1297306B (en) 1969-06-12 application
GB1109551A (en) 1968-04-10 application
CA806983A (en) 1969-02-25 grant
NL6609726A (en) 1967-01-24 application

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