CA1039638A - Chair with adjustable, tilting seat - Google Patents
Chair with adjustable, tilting seatInfo
- Publication number
- CA1039638A CA1039638A CA266,823A CA266823A CA1039638A CA 1039638 A CA1039638 A CA 1039638A CA 266823 A CA266823 A CA 266823A CA 1039638 A CA1039638 A CA 1039638A
- Authority
- CA
- Canada
- Prior art keywords
- chair
- seat
- support arm
- seat portion
- locking device
- 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.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—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
- A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
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
ABSTRACT
A chair having a tiltable seat and back supported on a verti-cal post and a laterally extending support arm thereof. The seat is pivoted at the front edge thereof to the support arm via a torsion bar and a locking device is provided between the seat and the support arm to lock the seat at any desired angle of tilt.
A chair having a tiltable seat and back supported on a verti-cal post and a laterally extending support arm thereof. The seat is pivoted at the front edge thereof to the support arm via a torsion bar and a locking device is provided between the seat and the support arm to lock the seat at any desired angle of tilt.
Description
~39638 This invention relates to a chair having a seat, a back portion connected to the sest and a support arm extending from a vertical post which supports the chalr, the seat belng tiltable about one end of the support arm ad~acent the front edge of the seat by means of a plvot axls.
Chairs of this type are generally known and it is a principal object of the invention to provide an improvement thereover.
Thus, according to one aspect of the invention, there is provld- -ed a chair comprising a vertical post; a support arm extending laterally from said post; a seat portion pivotally interconnected to said support arm at a position adjacent the front edge of the seat; a back portion connected to said seat portion; torsion means at the pivotal interconnec-tion co-acting with said seat portion and said support arm; and a selec-tively operable locking device operably connected between said support arm and said seat portion so as to retain said seat in selected position.
The invention is illustrated, by way of example, in the drawing wherein the single figure is a side elevational view of one embodiment of ;~
`` the invention.
Referring to the drawing, the chair comprises a vertical post 1 supported, in known manner, on a base 2 having arms and casters and merg-ing at its upper end into a support arm 3 extending diagonally forwardly.
Generally but not necessarily post 1 is cylindrical. Vertical post 1 and support arm 3 may, as illustrated herein, be integral with each other or, alternatively, may consist of two separate interconnected parts.
A seat 4 comprises a front portion 4' fixedly connected to post 1 by means of at least one support member 5 and a seat portion 4" movable relative to portion 4'. Seat portion 4" is generally provided in the form of a shell; in the embodiment illustrated it merges into an integrally formed back portion 6. Back portion 6 may, however, be provided as a separate member. The shell consisting of seat portion 4" and back portion 6 is pivotally journalled at the front end of support arm 3 on a pivot 16~39638 sllaft 8, or ~wo plvot pins (not shown), by means of one or more supporta 7 such that the sllell is tiltable. Extending around pivot shaft 8 i8 a torsion means, preferably in the form of a torsion bar 9 or a torsion spring (not shown),having a tendency to maintain shell 4", 6 in a position such that seat portion 4" and thus seat 4 is substantially horizontal. An increasing load is applied to the torsion rod with increas-ing backward tilt of shell 4", 6 which also results in an increasing backward movement of the centre of gravity of a person sitting on ~he chair and thus increases its distance from pivot shaft 8; the increase in distance results in an increase in torque acting on torsion bar 9. The torsion bar, however, has the adyantagethat its resiliency increases progressively.
In order to lock seat portion 4" or shell 4", 6 at any desired tilting angle, a locking device 10 may be provided between support arm 3 and the, or one of the, support(s) 7. This locking device 10 is pivot-ally journalled at opposite ends thereof on pivot axes 11 and is prefer-ably infinitely variable. A pneumatic spring of known design as has been extensively used in height adjustment of chairs most suitably meets these requirements. The pneumatic spring is arranged at an inclined angle, on the one hand, to fit beneath the seat and, on the other, to be affected by any change in distance between axes 11 due to a change in tilting angle of seat portion 4". Since pneumatic springs are lockable in any desired ; -position, the user of the chair can thereby adjust and retain any desired tilting position of the seat and/or shell.
Chairs of this type are generally known and it is a principal object of the invention to provide an improvement thereover.
Thus, according to one aspect of the invention, there is provld- -ed a chair comprising a vertical post; a support arm extending laterally from said post; a seat portion pivotally interconnected to said support arm at a position adjacent the front edge of the seat; a back portion connected to said seat portion; torsion means at the pivotal interconnec-tion co-acting with said seat portion and said support arm; and a selec-tively operable locking device operably connected between said support arm and said seat portion so as to retain said seat in selected position.
The invention is illustrated, by way of example, in the drawing wherein the single figure is a side elevational view of one embodiment of ;~
`` the invention.
Referring to the drawing, the chair comprises a vertical post 1 supported, in known manner, on a base 2 having arms and casters and merg-ing at its upper end into a support arm 3 extending diagonally forwardly.
Generally but not necessarily post 1 is cylindrical. Vertical post 1 and support arm 3 may, as illustrated herein, be integral with each other or, alternatively, may consist of two separate interconnected parts.
A seat 4 comprises a front portion 4' fixedly connected to post 1 by means of at least one support member 5 and a seat portion 4" movable relative to portion 4'. Seat portion 4" is generally provided in the form of a shell; in the embodiment illustrated it merges into an integrally formed back portion 6. Back portion 6 may, however, be provided as a separate member. The shell consisting of seat portion 4" and back portion 6 is pivotally journalled at the front end of support arm 3 on a pivot 16~39638 sllaft 8, or ~wo plvot pins (not shown), by means of one or more supporta 7 such that the sllell is tiltable. Extending around pivot shaft 8 i8 a torsion means, preferably in the form of a torsion bar 9 or a torsion spring (not shown),having a tendency to maintain shell 4", 6 in a position such that seat portion 4" and thus seat 4 is substantially horizontal. An increasing load is applied to the torsion rod with increas-ing backward tilt of shell 4", 6 which also results in an increasing backward movement of the centre of gravity of a person sitting on ~he chair and thus increases its distance from pivot shaft 8; the increase in distance results in an increase in torque acting on torsion bar 9. The torsion bar, however, has the adyantagethat its resiliency increases progressively.
In order to lock seat portion 4" or shell 4", 6 at any desired tilting angle, a locking device 10 may be provided between support arm 3 and the, or one of the, support(s) 7. This locking device 10 is pivot-ally journalled at opposite ends thereof on pivot axes 11 and is prefer-ably infinitely variable. A pneumatic spring of known design as has been extensively used in height adjustment of chairs most suitably meets these requirements. The pneumatic spring is arranged at an inclined angle, on the one hand, to fit beneath the seat and, on the other, to be affected by any change in distance between axes 11 due to a change in tilting angle of seat portion 4". Since pneumatic springs are lockable in any desired ; -position, the user of the chair can thereby adjust and retain any desired tilting position of the seat and/or shell.
-2-
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A chair comprising a vertical post; a support arm extending laterally from said post; a seat portion pivotally interconnected to said support arm at a position adjacent the front edge of the seat; a back portion connected to said seat portion; torsion means at the pivot-al interconnection co-acting with said seat portion and said support arm;
and a selectively operable locking device operably connected between said support arm and said seat portion so as to retain said seat in selected position.
and a selectively operable locking device operably connected between said support arm and said seat portion so as to retain said seat in selected position.
2. A chair as claimed in claim 1 wherein said locking device is an infinitely variable device.
3. A chair as claimed in claim 2 wherein said locking device is a pneumatic spring.
4. A chair as claimed in claim 1, 2 or 3 wherein said torsion means is a torsion bar.
5. A chair as claimed in claim 1, 2 or 3 wherein said vertical post is a cylindrical post.
6. A chair as claimed in claim 1, 2 or 3 wherein said back portion is integrally formed with said seat portion.
7. A chair as claimed in claim 1, 2 or 3 wherein said back portion is separately formed and connected to said seat portion.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7538910U DE7538910U (en) | 1975-12-05 | 1975-12-05 | ARMCHAIR |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1039638A true CA1039638A (en) | 1978-10-03 |
Family
ID=6658472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA266,823A Expired CA1039638A (en) | 1975-12-05 | 1976-11-29 | Chair with adjustable, tilting seat |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS52103907U (en) |
| CA (1) | CA1039638A (en) |
| DE (1) | DE7538910U (en) |
| ZA (1) | ZA767058B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9833076B2 (en) | 2014-09-16 | 2017-12-05 | Herman Miller, Inc. | Human balance work stool |
| US10143308B2 (en) | 2015-07-23 | 2018-12-04 | Herman Miller, Inc. | Seating device |
| US11596232B2 (en) | 2019-04-16 | 2023-03-07 | MillerKnoll, Inc. | Chair for active engagement of user |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995034233A1 (en) * | 1994-06-10 | 1995-12-21 | Haworth, Inc. | Ergonomic chair |
-
1975
- 1975-12-05 DE DE7538910U patent/DE7538910U/en not_active Expired
-
1976
- 1976-11-25 ZA ZA767058A patent/ZA767058B/en unknown
- 1976-11-29 CA CA266,823A patent/CA1039638A/en not_active Expired
- 1976-12-04 JP JP1976163014U patent/JPS52103907U/ja active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9833076B2 (en) | 2014-09-16 | 2017-12-05 | Herman Miller, Inc. | Human balance work stool |
| US10143308B2 (en) | 2015-07-23 | 2018-12-04 | Herman Miller, Inc. | Seating device |
| US10362874B2 (en) | 2015-07-23 | 2019-07-30 | Herman Miller, Inc. | Seating device |
| US11596232B2 (en) | 2019-04-16 | 2023-03-07 | MillerKnoll, Inc. | Chair for active engagement of user |
| US11805905B2 (en) | 2019-04-16 | 2023-11-07 | MillerKnoll, Inc. | Chair for active engagement of user |
Also Published As
| Publication number | Publication date |
|---|---|
| DE7538910U (en) | 1976-04-01 |
| ZA767058B (en) | 1977-10-26 |
| JPS52103907U (en) | 1977-08-08 |
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