WO1991010384A1 - A convertible chair - Google Patents
A convertible chair Download PDFInfo
- Publication number
- WO1991010384A1 WO1991010384A1 PCT/DK1991/000007 DK9100007W WO9110384A1 WO 1991010384 A1 WO1991010384 A1 WO 1991010384A1 DK 9100007 W DK9100007 W DK 9100007W WO 9110384 A1 WO9110384 A1 WO 9110384A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- arm
- seat
- rest
- chair
- knee rest
- 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
- A47C9/00—Stools for specified purposes
- A47C9/002—Stools for specified purposes with exercising means or having special therapeutic or ergonomic effects
- A47C9/005—Stools for specified purposes with exercising means or having special therapeutic or ergonomic effects with forwardly inclined seat, e.g. with a knee-support
Definitions
- the invention concerns a chair as defined in the introduc- tory portion of claim 1, i.e. a chair which can be con ⁇ verted from one state where a person can traditionally sit on the approximately horizontal seat of the chair, to another state where the person can sit on the now inclined seat of the chair, one and the same means being used as a back rest in said one state and as a knee rest in said other state.
- Such a convertible chair is known e.g. from the US Patent Specification 4 793 655.
- a hook be ⁇ low the seat and to convert the chairs to the other state with inclined seat and with knee rest some dexterity must be exercised to find and to release the hook, and the per- son must moreover bend to be able to see the hook below the seat.
- the seat and the knee rest are not locked in this state, which is therefore unstable. The chair therefore involves the risk that the seat and the knee rest will tilt in case of certain loads with unfortu ⁇ nate consequences for the person.
- the US Patent Specification 4 763 982 discloses a convert ⁇ ible chair where a transverse rod on a two-armed lever, which carries the back/knee rest, is to be positioned in a specific gap between downwardly facing teeth on an open rack on the lower side of the seat.
- the conversion is dif ⁇ ficult to perform and involves some uncertainty, and great care is to be exercised in practice to localize the rod in precisely the tooth gap giving the desired angular posi ⁇ tion between the seat and the rest.
- the great drawback of this chair is that it is potentially unstable in both of its positions.
- the object of the present invention is to provide a con- vertible chair where seat and back/knee rest in both states of the chair are locked and cannot be released from the state concerned with a person sitting on the chair. Moreover, the chair must be capable of being converted from one state to the other easily and safely with a simple and uncomplicated manipulation and provide great security against wrong operation. This is achieved with a chair constructed as stated in claim 1.
- the controlling engagement between the engagement means ensures a well-defined and safe conversion of the chair under all circumstances.
- the engagement means may advantageously be provided with a terminated guide groove with two ends and a projection, respectively, which protrudes into the guide groove.
- the weight of the rest carrying arm entails that the projection is normally biassed for movement in an upward direction, ensuring that the chair automatically tries to adjust itself to a position of use when being converted.
- the user When initiating the conversion, the user shall moreover activate both the seat and the rest for the projection to be moved down into the bottom of the U-shaped guide groove, and this combined activation movement prevents un ⁇ intentional conversion of the chair.
- the chair With a view to adapting the chair partly to persons of different sizes, partly to one and the same person in the two positions of use, the chair may be adjustable in va ⁇ rious manners.
- the arm may have two angularly arranged sec- tions which are connected through a fixable pivot link to adjust the distance between the rest and the seat.
- the length of the arm may be varied in a pre- ferred embodiment, where a first, rest carrying arm sec ⁇ tion is slidable transversely to a second arm section forming a connection between the first arm section and the support column.
- fig. 2 shows the chair in another state
- fig. 3 shows the conversion mechanism of the chair in one state
- fig. 4 shows the conversion mechanism of the chair in the other state.
- the chair has a sup ⁇ porting structure consisting of a pipe 11 and a column 12 which is slidable in the pipe 11, so that the chair can be adjusted in height in traditional manner.
- the pipe 11 is secured in a known manner to a support 24 which rests on the floor.
- the chair moreover has a seat 13 as well as a rest 14, which serves as a back rest in fig. 1 showing the chair in one state, and serves as a knee rest in fig. 2 showing the chair in the other state.
- the rest 14 is called back/knee rest below and is of a known structure like the seat 13.
- the column 12 carries a bracket 23, to which the seat 13 is swingably journalled about a horizontal axis 15.
- a two-armed lever 16 is likewise jour ⁇ nalled to the bracket 23 at its horizontal axis of rota ⁇ tion 17.
- the back/knee rest 14 is secured to one end of the two-armed lever 16, and it appears from figs. 3 and 4 that the other end of the lever 16 has a transverse shaft 18 which is guided by a U-shaped guide 19 in firm connection with the seat 13.
- the U-shaped guide 19 has its two guide branches extending tangentially with respect to the axis of rotation 15 of the seat.
- the transverse shaft 18 protrudes into or through the U- shaped guide 19, and the movements of the seat 13 and of the two-armed lever 16 are thus coupled to each other.
- one of the branches of the U-shaped guide accommodates a block 20 which is to serve as an end stop.
- a variable end stop is obtained by varying the length of this block 20, so that the mutual position of the seat 13 and the two-armed lever 16 and thereby the rest 14 may be varied.
- the shaft 18 is arranged on the two-armed lever 16, and the U-shaped guide 19 is firmly connected with the seat 13.
- these might be ex ⁇ changed with the same result so that a U-shaped guide is arranged on the two-armed lever 16, but with the branches facing downwardly, and such that the transverse shaft 18 is mounted in firm connection with the seat 13.
- a grip 27 permits the arm 22 with the back/ knee rest to be displaced longitudinally of the lever 16 and to be fixed in any position.
- the angular arm 22 can be tilted and fixed with a grip 21 in any angle with respect to the lever 16, and the length of the angular arm 22 may be adjusted and fixed with a grip 26.
- the back/knee rest 14 may be positioned and fixed in any angular position with respect to the angular arm 22 with a grip 25.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91903088A EP0594582A1 (en) | 1990-01-10 | 1991-01-10 | A convertible chair |
JP91503042A JPH05506585A (en) | 1990-01-10 | 1991-01-10 | convertible chair |
NO92922703A NO922703L (en) | 1990-01-10 | 1992-07-09 | AN ADJUSTABLE CHAIR |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK0070/90 | 1990-01-10 | ||
DK007090A DK167334B1 (en) | 1990-01-10 | 1990-01-10 | CONVERTIBLE CHAIR |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991010384A1 true WO1991010384A1 (en) | 1991-07-25 |
Family
ID=8089396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK1991/000007 WO1991010384A1 (en) | 1990-01-10 | 1991-01-10 | A convertible chair |
Country Status (8)
Country | Link |
---|---|
US (1) | US5261727A (en) |
EP (1) | EP0594582A1 (en) |
JP (1) | JPH05506585A (en) |
AU (1) | AU636716B2 (en) |
CA (1) | CA2072867A1 (en) |
DK (1) | DK167334B1 (en) |
NO (1) | NO922703L (en) |
WO (1) | WO1991010384A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4234883C1 (en) * | 1992-10-16 | 1994-04-21 | Pius Ponticelli | Chair with backrest and seat on base frame - has two end stops, backrest support and knee support. |
WO2022129939A1 (en) * | 2020-12-17 | 2022-06-23 | Runnerfly Ltd | Convertible chair |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6431649B1 (en) * | 1993-11-01 | 2002-08-13 | Labofa A/S | Working chair with synchronous seat and back adjustment |
DE19543818C1 (en) * | 1995-11-24 | 1997-05-07 | Desanta | Chair with knee support |
US20030062750A1 (en) * | 1996-10-04 | 2003-04-03 | Walter Brian A. | Spine tensioning support chair |
US6435611B1 (en) * | 1996-10-04 | 2002-08-20 | Brian A. Walter | Spine tensioning support chair |
CA2302063C (en) * | 2000-03-23 | 2010-08-17 | Cke Technologies Inc. | Ergonomic chair |
US6820934B2 (en) * | 2000-11-09 | 2004-11-23 | Michigan Tube Swagers & Fabricators, Inc. | Chair having flexible back support |
US6471293B2 (en) | 2000-11-09 | 2002-10-29 | Michigan Tube Swagers & Fabricators, Inc. | Stackable chair with flexible back support |
US6805412B2 (en) * | 2001-08-30 | 2004-10-19 | Burgess Furniture Ltd. | Stackable chair with flexible back |
US7806478B1 (en) * | 2006-01-04 | 2010-10-05 | Sava Cvek | Task chair with dual tilting capabilities |
CA2664911C (en) * | 2006-04-20 | 2014-09-02 | Distribution Gablex Inc. | Abdominal support swivel chair |
DE102006056928B3 (en) * | 2006-12-04 | 2008-06-05 | Sato Office Gmbh | Seat for e.g. office chair, has rod elements fitted with front ends on seat panel, in pivotable and linearly movable manner and connected to angled extension of rear connecting levers in pivotable manner |
DE102011010099A1 (en) * | 2011-02-01 | 2012-08-02 | Bock 1 Gmbh & Co. Kg | synchronous mechanism |
US8777305B1 (en) | 2012-01-12 | 2014-07-15 | J Squared, Inc. | Multifunction chair convertible from office chair to floor rocker and stool |
CN106455821A (en) | 2014-04-17 | 2017-02-22 | Hni技术公司 | Chair and chair control assemblies, systems, and methods |
USD819540S1 (en) | 2017-03-15 | 2018-06-05 | Brunswick Corporation | Convertible leaning post seating for marine vessels |
US9821887B1 (en) * | 2016-03-31 | 2017-11-21 | Brunswick Corporation | Convertible leaning post seating system for marine vessels |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4736982A (en) * | 1985-11-07 | 1988-04-12 | Hwang Sunny S | Convertible chair |
US4793655A (en) * | 1987-03-20 | 1988-12-27 | Kval Marketing Inc. | Multi-position convertible therapeutic chair |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2471024A (en) * | 1946-10-04 | 1949-05-24 | Roy A Cramer | Chair with tilting back and automatically shiftable seat |
JPS60117742U (en) * | 1984-01-18 | 1985-08-09 | 株式会社岡村製作所 | chair recliner |
US4650249A (en) * | 1984-12-31 | 1987-03-17 | Hector Serber | Ergonomic seating assembly system with front chest support component, pelvic tilt seat component and related attachments |
AU583668B2 (en) * | 1985-10-07 | 1989-05-04 | Robert Craig Hart | Chair |
US4765684A (en) * | 1987-03-20 | 1988-08-23 | Kval Marketing Inc. | Multi-purpose chair with retractable knee rest |
US4834454A (en) * | 1987-05-15 | 1989-05-30 | Faultless-Doerner Manufacturing Inc. | Office chair with tiltable seat and back |
US5054857A (en) * | 1990-08-27 | 1991-10-08 | Kvalheim Andrew M | Convertible chair |
-
1990
- 1990-01-10 DK DK007090A patent/DK167334B1/en not_active IP Right Cessation
-
1991
- 1991-01-10 CA CA002072867A patent/CA2072867A1/en not_active Abandoned
- 1991-01-10 US US07/867,713 patent/US5261727A/en not_active Expired - Fee Related
- 1991-01-10 JP JP91503042A patent/JPH05506585A/en active Pending
- 1991-01-10 AU AU71816/91A patent/AU636716B2/en not_active Ceased
- 1991-01-10 WO PCT/DK1991/000007 patent/WO1991010384A1/en not_active Application Discontinuation
- 1991-01-10 EP EP91903088A patent/EP0594582A1/en not_active Ceased
-
1992
- 1992-07-09 NO NO92922703A patent/NO922703L/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4736982A (en) * | 1985-11-07 | 1988-04-12 | Hwang Sunny S | Convertible chair |
US4793655A (en) * | 1987-03-20 | 1988-12-27 | Kval Marketing Inc. | Multi-position convertible therapeutic chair |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4234883C1 (en) * | 1992-10-16 | 1994-04-21 | Pius Ponticelli | Chair with backrest and seat on base frame - has two end stops, backrest support and knee support. |
WO2022129939A1 (en) * | 2020-12-17 | 2022-06-23 | Runnerfly Ltd | Convertible chair |
GB2602099B (en) * | 2020-12-17 | 2023-07-05 | Runnerfly Ltd | Convertible chair |
Also Published As
Publication number | Publication date |
---|---|
AU7181691A (en) | 1991-08-05 |
AU636716B2 (en) | 1993-05-06 |
JPH05506585A (en) | 1993-09-30 |
DK7090A (en) | 1991-07-11 |
DK7090D0 (en) | 1990-01-10 |
CA2072867A1 (en) | 1991-07-11 |
EP0594582A1 (en) | 1994-05-04 |
NO922703D0 (en) | 1992-07-09 |
US5261727A (en) | 1993-11-16 |
NO922703L (en) | 1992-09-09 |
DK167334B1 (en) | 1993-10-18 |
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