GB2125284A - Adjustable chairs - Google Patents

Adjustable chairs Download PDF

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Publication number
GB2125284A
GB2125284A GB08318469A GB8318469A GB2125284A GB 2125284 A GB2125284 A GB 2125284A GB 08318469 A GB08318469 A GB 08318469A GB 8318469 A GB8318469 A GB 8318469A GB 2125284 A GB2125284 A GB 2125284A
Authority
GB
United Kingdom
Prior art keywords
pivot
seat support
frame
pivotably connected
seat
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
GB08318469A
Other versions
GB8318469D0 (en
GB2125284B (en
Inventor
Robert Harnick
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.)
METALSTAND CO
Original Assignee
METALSTAND 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 METALSTAND CO filed Critical METALSTAND CO
Publication of GB8318469D0 publication Critical patent/GB8318469D0/en
Publication of GB2125284A publication Critical patent/GB2125284A/en
Application granted granted Critical
Publication of GB2125284B publication Critical patent/GB2125284B/en
Expired 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
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03283—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with fluid springs

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chairs Characterized By Structure (AREA)

Abstract

Furniture item, such as a chair (10), with synchronous movement of back and seat comprises a stationary frame (20), a seat support (24) pivotably connected to the frame (20) at a first pivot (26), and a gas cylinder (28) and piston rod (30) pivotably connected to the frame (20) at a second pivot (32) and the seat support (24) at a third pivot (34). The seat support (24) is pivotably connected to back (40) at a fourth pivot (38), and the back is pivotably connected to the stationary frame (20) at a fifth pivot (44) including at least one pin on one of the back and stationary frame (20) and extending into a slot (42) at one end of the other of the back and stationary frame (20). Adjustment of the angle of the seat support (24) relative to the frame (20) automatically adjusts the angle of the back relative to the seat support (24) in a predetermined ratio. <IMAGE>

Description

SPECIFICATION Furniture item with synchronous movement of back and seat It is known to provide an item of furniture, such as a chair, with synchronous movement between a back and seat. Such chairs are unnecessarily complicated, require numerous parts which in turn gives the chair a bulky appearance. The furniture item of the present invention is directed to a solution of those problems by minimizing the number of components and simplifying the interrelation of components to provide a compact chair which is easy to assemble.
A first aspect of the present invention is directed to a furniture item with synchronous movement of back and seat comprising a seat support and back adjustable with respect to a stationary frame, means for synchronizing pivotable movement of the back and seat in a predetermined ratio, said means including the seat support being pivotably connected to the frame at a first pivot, a gas cylinder and piston rod, one end of the piston rod being pivotably connected to the frame at a second pivot, one end of the cylinder being pivotably connected to the seat support at a third pivot, the seat support being pivotably connected to the back at a fourth pivot, the back being pivotably connected to the stationary frame at a fifth pivot, the fifth pivot including at least one pin on one of the back and the stationary frame and extending into a slot at an end of the other of the back and stationary frame, whereby adjustment of the angle of the seat support relative to the frame automatically adjusts the angle of the back relative to the seat support in said predetermined ratio.A second aspect of the present invention is directed to a furniture item with synchronous movement of back and seat comprising a seat support and back adjustable with respect to a stationary frame, means for synchronizing pivotable movement of the back and seat in a predetermined ratio, said means including the seat support being pivotably connected to the frame at a first pivot, a gas cylinder and piston rod for adjusting each of the seat support and back relative to the stationary frame, one end of the piston rod being pivotably connected to the frame at a second pivot, one end of the cylinder being pivotably connected to the seat support at a third pivot, the seat support being pivotably connected to the back at a fourth pivot, the back being pivotably connected to the stationary frame at a fifth pivot, the fifth pivot including at least one pin on one of the back and the stationary frame and extending into straight slots at an end of the other of the back and stationary frame, whereby adjustment of the angle of the seat support relative to the frame will automatically adjust the angle of the back relative to the seat support in said predetermined ratio, said synchronous movement including only the five pivots with the elevation of the second and fifth pivots being below the elevation of the remaining pivots.
The thusly interrelated elements of furniture such as a chair will facilitate adjustment of the angle of the seat support relative to the frame and automatically adjust the angle of the back relative to the seat support at a predetermined ratio.
For the purpose of illustrating the invention, there is shown in the drawings a form which is presently preferred; it being understood, however, that this invention is not limited to the precise arrangements and instrumentalities shown.
Figure 1 is a perspective view of a chair.
Figure 2 is a sectional view taken along the line 2-2 in Figure 1.
Figure 3 is a view similar to Figure 2 but showing another position of the back and seat.
Figure 4 is a sectional view taken along the line 4-4 in Figure 2.
Figure 5 is a sectional view of an alternative fifth pivot.
Detailed Description Referring to the drawing in detail, wherein like numerals indicate like elements, there is shown in Figure 1 an article of furniture designated generally as 1 0. For purposes of illustration, the furniture 10 is a chair.
The chair 10 includes a base 1 2 horizontally disposed and supported by a plurality of castor wheels 1 4. A vertical standard 1 6 extends upwardly from the base 1 2. The chair includes a two-piece shell 1 8 wherein one piece is attached to the back and the other piece is attached to the bottom of the seat portion. For purposes of clarity, the shell 1 8 is not shown in Figures 2-5.
A stationary frame 20 is fixedly attached to the upper end of the standard 1 6. Standard 16 is preferably hollow so that it may contain a conventional gas cylinder or air spring for adjusting the vertical height of the chair seat. A conventional device is utilized to facilitate adjustment of the height of the back relative to the seat. Frame 20 has upwardly extending flanges 21 and 23. A seat support 24 is provided with seat cushions 22 on the upper surface thereof in a conventional manner. The seat support 24 has downwardly extending flanges 27. Each flange 27 is pivotably connected by pivot pin 26 to one of the flanges 21,23. Flanges 27 are preferably outside the flanges 21,23 as shown in Figure 4 but may be positioned between flanges 21, 23 if desired. Pivot pin 26 may be referred to as a first pivOt.
A cylinder or air spring 28 has a piston rod 30 extending therefrom. The piston rod 30 is pivotably connected to the frame 20 by pivot 32.
Pivot 32 may be referred to as a second pivot. The end of the cylinder 28 remote from the piston rod 30 is pivotably connected to a pair of flanges 35 depending from the seat support 24 at pivot 34.
Pivot 34 may be referred to as a third pivot.
The seat support 24 or the flanges 35 thereof extend beyond the pivot 34 and are pivotably connected to the back 36 at pivot 38. Pivot 38 may be referred to as a fourth pivot. Pivot 38 may be supported by brackets 39 on the back 36 or instead pivot 38 may be a pin supported at its ends by flanges 46. Cushions 40 may be attached to the back 36 in any conventional manner.
The lower end of the back 36 includes a pair of forwardly extending flanges 46. Each flange 46 has a slot 42 receiving a pivot pin 44. One end of the pin 44 is fixed on the flange 23 of the frame 20. The other end of pin 44 is fixed on the flange 21 of the frame 20. Since the frame 20 is stationary, the pin 44 is stationary and may be considered a fifth pivot. Pin 44 is hardened steel and may have a sleeve of plastic such as an acetal resin where it extends through slots 42 to reduce noise. Alternatively the slots 42 may have a liner of such resin.
The angle and length of the slot 42 defines the predetermined ratio of adjustment of the back relative to the seat. As illustrated, the slot 42 is arranged to cause the back to pivot through an angle of 2 for every angle that the seat support 24 pivots. The five pivots in the manner illustrated and described result in a synchronized movement of the back and seat support in a predetermined ratio merely by adjustment of the cylinder or air spring 28 as exemplified by a comparison of Figures 2 and 3. The cylinder or air spring 28 is preferably operated by a lever not shown. The structural interrelationship of the components minimizes the number of components and provides for a seat portion of minimum depth.
Also, the arrangement of components is easy to assemble. The manner in which the cushions 22 and any associated support are connected to the seat support 24 may be conventional.
In Figure 5 there is illustrated a preferred form of the fifth pivot wherein corresponding elements are identified with corresponding numerals. The frame 20' has depending flanges 48. The slot 42' is in the flanges 48 and the associated pin 44' is fixedly attached to the flanges 46'.
Notwithstanding the reversal of parts, the fifth pivots perform in the same manner. The fifth pivot shown in Figure 5 is preferred since it transmits the loads involved with less stress and is less expensive to construct. Pin 44', like pin 44, may be covered with a plastic sleeve to reduce noise.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof and, accordingly, reference should be made to the appended claims, rather than to the foregoing specification, as indicating the scope of the invention.

Claims (8)

1. Furniture item with synchronous movement of back and seat comprising a seat support and back adjustable with respect to a stationary frame, means for synchronizing pivotable movement of the back and seat in a predetermined ratio, said means including the seat support being pivotably connected to the frame at a first pivot, a gas cylinder and piston rod, one end of the piston rod being pivotably connected to the frame at a second pivot, one end of the cylinder being pivotably connected to the seat support at a third pivot, the seat support being pivotably connected to the back at a fourth pivot, the back being pivotably connected to the stationary frame at a fifth pivot, the fifth pivot including at least one pin on one of the back and the stationary frame and extending into a slot at an end of the other of the back and stationary frame, whereby adjustment of the angle of the seat support relative to the frame automatically adjusts the angle of the back relative to the seat support in said predetermined ratio.
2. Furniture item in accordance with claim 1, wherein said predetermined ratio is two to one.
3. Furniture item in accordance with claim 1 or 2, wherein said slot is straight.
4. Furniture item in accordance with any previous claim, wherein the back has a pair of side flanges each containing a discrete slot, each slot receiving one end of the pin on the stationary frame.
5. Furniture item in accordance with claim 1,2 or 3, wherein there are a pair of slots located on the stationary frame with each slot receiving a discrete end of the pin which is located on the back.
6. Furniture item in accordance with any previous claim, wherein there are only five pivots with the elevation of the second and fifth pivots being below the elevation of the remaining pivots, said third and fourth pivots being the only pivots whose elevation changes when the back and seat are adjusted relative to one another.
7. Furniture item with synchronous movement of back and seat comprising a seat support and back adjustable with respect to a stationary frame, means for synchronizing pivotable movement of the back and seat in a predetermined ratio, said means including the seat support being pivotably connected to the frame at a first pivot, a gas cylinder and piston rod for adjusting each of the seat support and back relative to the stationary frame, one end of the piston rod being pivotably connected to the frame at a second pivot, one end of the cylinder being pivotably connected to the seat support at a third pivot, the seat support being pivotably connected to the back at a fourth pivot, the back being pivotably connected to the stationary frame at a fifth pivot, the fifth pivot including at least one pin on one of the back and the stationary frame and extending into straight slots at an end of the other of the back and stationary frame, whereby adjustment of the angle of the seat support relative to the frame will automatically adjust the angle of the back relative to the seat support in said predetermined ratio, said synchronous movement including only the five pivots with the elevation of the second and fifth pivots being below the elevation of the remaining pivots.
8. A chair with synchronous movement between its back and seat substantially as hereinbefore described with reference to the accompanying drawings.
GB08318469A 1982-08-16 1983-07-07 Adjustable chairs Expired GB2125284B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40856082A 1982-08-16 1982-08-16
AU21112/83A AU2111283A (en) 1982-08-16 1983-11-09 Adjustable chari

Publications (3)

Publication Number Publication Date
GB8318469D0 GB8318469D0 (en) 1983-08-10
GB2125284A true GB2125284A (en) 1984-03-07
GB2125284B GB2125284B (en) 1985-08-07

Family

ID=25618110

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08318469A Expired GB2125284B (en) 1982-08-16 1983-07-07 Adjustable chairs

Country Status (5)

Country Link
JP (1) JPS5944213A (en)
AU (1) AU2111283A (en)
DE (1) DE3329581A1 (en)
FR (1) FR2531618A1 (en)
GB (1) GB2125284B (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4682814A (en) * 1983-05-06 1987-07-28 Provenda Marketing Ag Tilting seat and back chair, particularly tilting desk chair
DE3737492A1 (en) * 1987-11-05 1989-05-18 Wilkhahn Wilkening & Hahne Chair
DE3737491A1 (en) * 1987-11-05 1989-05-18 Wilkhahn Wilkening & Hahne Chair
GB2219198A (en) * 1988-05-31 1989-12-06 James Paul Lansing Adjustable bed table
GB2246287A (en) * 1990-06-12 1992-01-29 Unit Press Limited Underseat mechanism for chairs
EP0488278A1 (en) * 1990-11-29 1992-06-03 Martin Bock Kunststoffverarbeitung Seat support for an office chair
US5826940A (en) * 1995-11-27 1998-10-27 Hodgdon; Dewey Reactive multi-position chair
WO1999026518A1 (en) * 1997-11-21 1999-06-03 Compact S.R.L. Power-driven armchair with an improved structure
US6095606A (en) * 1995-12-18 2000-08-01 Peter Opsvik As Adjusting device for chairs
US7267405B2 (en) 2004-06-21 2007-09-11 Yu Yeung Tin Chair with a synchronous coordinating system for the chair back
US7735940B2 (en) 2005-10-27 2010-06-15 Chi-Shen Chiu Volume-adjustable unit and furniture comprising frame made of the same
EP3437520A1 (en) * 2017-08-05 2019-02-06 BOCK 1 GmbH & Co. KG Rocking mechanism

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8417429U1 (en) * 1984-06-08 1984-09-20 Hansen, Eckard, 9430 St. Margrethen Point synchronous adjustment device for office chairs
DE3527785A1 (en) * 1985-08-02 1987-02-12 Froescher August Gmbh Co Kg SUPPORT AND ADJUSTMENT FOR SEAT AND BACKREST ON A WORK CHAIR
AU581120B2 (en) * 1986-02-18 1989-02-09 Sebel Furniture Limited An article of furniture
AU621848B2 (en) * 1988-01-06 1992-03-26 Schiavello Bros. (Vic.) Pty. Ltd. Adjustable chair
JPH024444U (en) * 1988-06-23 1990-01-11
AU668431B2 (en) * 1992-12-01 1996-05-02 Klasse Pty Ltd Adjustment mechanism for a chair
DE10064204A1 (en) * 2000-12-22 2002-07-04 Wilkhahn Wilkening & Hahne Chair has slide attached to seat front which moves in inclined guide and curved levers attached to sides of back rest and rear of seat
JP2008220404A (en) * 2007-03-08 2008-09-25 West Japan Jr Bus Co Vehicle seat
JP4742060B2 (en) * 2007-03-09 2011-08-10 財団法人北海道農業開発公社 Grassland update machine and grassland update method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1233664A (en) * 1968-04-16 1971-05-26
GB1455009A (en) * 1972-12-22 1976-11-10 Sirot R A Adjustable seats particularly for use in aircraft
GB1528551A (en) * 1976-01-24 1978-10-11 Schuckmann Alfred Von Reclining furniture

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE572893A (en) *
US2961035A (en) * 1954-05-26 1960-11-22 Lorenz Anton Article of repose for supporting the body of a person
DE1404662A1 (en) * 1960-07-07 1969-02-20 Schliephacke Fridtjof F Reclining armchair
DE2335586A1 (en) * 1973-01-29 1975-01-30 Fritz Kerstholt SITTING AND / OR Lounging furniture with moveable back
DE2843058A1 (en) * 1978-10-03 1980-04-24 Kloeber Kg Adjustment mechanism for reclining seats - includes height adjustment for backrest to reduce relative movement between seat and rest
DE7831696U1 (en) * 1978-10-25 1979-03-15 Drabert Soehne, 4950 Minden SEATING FURNITURE, IN PARTICULAR OFFICE SWIVEL CHAIR WITH INCLINATION ADJUSTMENT
DE2915520A1 (en) * 1979-04-17 1980-10-30 Siemens Ag Telephone automatic dialling unit with short term storage - has special key and store for number dialled so that repeats can be made if original attempt fails

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1233664A (en) * 1968-04-16 1971-05-26
GB1455009A (en) * 1972-12-22 1976-11-10 Sirot R A Adjustable seats particularly for use in aircraft
GB1528551A (en) * 1976-01-24 1978-10-11 Schuckmann Alfred Von Reclining furniture

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4682814A (en) * 1983-05-06 1987-07-28 Provenda Marketing Ag Tilting seat and back chair, particularly tilting desk chair
DE3737491C2 (en) * 1987-11-05 2003-03-20 Wilkhahn Wilkening & Hahne chair
DE3737492A1 (en) * 1987-11-05 1989-05-18 Wilkhahn Wilkening & Hahne Chair
DE3737491A1 (en) * 1987-11-05 1989-05-18 Wilkhahn Wilkening & Hahne Chair
DE3737492C2 (en) * 1987-11-05 2003-03-27 Wilkhahn Wilkening & Hahne Chair with four swivel joints
US4910816A (en) * 1988-05-31 1990-03-27 Jvj Enterprises, Inc. Adjustable bed table
GB2219198A (en) * 1988-05-31 1989-12-06 James Paul Lansing Adjustable bed table
GB2246287B (en) * 1990-06-12 1993-10-20 Unit Press Limited Back support pillar for a chair
US5286088A (en) * 1990-06-12 1994-02-15 Unit Press Limited Underseat mechanism for a chair
GB2246287A (en) * 1990-06-12 1992-01-29 Unit Press Limited Underseat mechanism for chairs
EP0488278A1 (en) * 1990-11-29 1992-06-03 Martin Bock Kunststoffverarbeitung Seat support for an office chair
US5826940A (en) * 1995-11-27 1998-10-27 Hodgdon; Dewey Reactive multi-position chair
US6095606A (en) * 1995-12-18 2000-08-01 Peter Opsvik As Adjusting device for chairs
WO1999026518A1 (en) * 1997-11-21 1999-06-03 Compact S.R.L. Power-driven armchair with an improved structure
US7267405B2 (en) 2004-06-21 2007-09-11 Yu Yeung Tin Chair with a synchronous coordinating system for the chair back
US7735940B2 (en) 2005-10-27 2010-06-15 Chi-Shen Chiu Volume-adjustable unit and furniture comprising frame made of the same
EP3437520A1 (en) * 2017-08-05 2019-02-06 BOCK 1 GmbH & Co. KG Rocking mechanism

Also Published As

Publication number Publication date
JPS5944213A (en) 1984-03-12
GB8318469D0 (en) 1983-08-10
GB2125284B (en) 1985-08-07
DE3329581A1 (en) 1984-02-23
FR2531618A1 (en) 1984-02-17
AU2111283A (en) 1985-05-16

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Legal Events

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PCNP Patent ceased through non-payment of renewal fee