EP0707817A1 - Oscillatilng support unit for chairs with seat and backrest having synchronized variable tilting - Google Patents
Oscillatilng support unit for chairs with seat and backrest having synchronized variable tilting Download PDFInfo
- Publication number
- EP0707817A1 EP0707817A1 EP95830265A EP95830265A EP0707817A1 EP 0707817 A1 EP0707817 A1 EP 0707817A1 EP 95830265 A EP95830265 A EP 95830265A EP 95830265 A EP95830265 A EP 95830265A EP 0707817 A1 EP0707817 A1 EP 0707817A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- support
- seat
- backrest
- axis
- oscillation
- 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.)
- Ceased
Links
Images
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
- A47C1/03238—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by means of peg-and-notch or pawl-and-ratchet mechanism
-
- 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
- A47C1/03266—Reclining 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
-
- 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
- A47C1/03272—Reclining 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
Definitions
- the present invention pertains in general to chairs with seat and backrest having synchronized variable tilting, and more specifically an oscillating support unit for the elements of the seat of such chairs.
- seat and backrest have synchronized variable tilting, that is to say susceptible to independent angular movements on corresponding axes of horizontal rotation.
- the seat may tilt gradually upwards and with respect to a fixed body supported by a base while the backrest varies its tilt automatically according to the arrangement of the seat, or vice versa.
- the synchronization of the movements is obtained through an articulated joint with parallel axes of the seat supports and of the backrest between them and at the stationary support body and with the aid of opposing elastic elements.
- the articulated joint between said supports is obtained with lever mechanisms or with synchronization connectors that make it possible to compensate reciprocal sliding of the supports oscillating on different axes.
- the freedom of reciprocal sliding between said supports is achieved by introducing the articulation axis connecting the supports of seat and backrest through a slot.
- the unit at issue essentially comprises a boxed body 11 fixed to the top of a supporting upright 12 which rises on a base -not illustrated- and usually at an adjustable height, a support 13 for the seat and a support 14 for the backrest of the seat.
- the boxed body 11 is fixed and has an invariable arrangement and extends forwards overhanging the supporting upright 12.
- the seat support 13 is jointed, at the front, to the front of the fixed boxed body 11 on an axis X oriented transversely to the seat. Said support 13 extends backwards overhanging with the possibility of oscillating over the fixed body 11.
- the backrest support 14 is connected to the seat support 13, without sliding, by means of a transverse shaft 15 for their combined oscillations in response to the oscillation of one of them.
- the backrest support 14 is also jointed to the fixed boxed body 11 on an axis Y parallel to the axis of oscillation X of the seat support 13.
- the axis Y is formed by a shaft 16 fixed between two lugs 17 integral with the seat support 13, and this shaft 16 extends into slotted holes 18 obtained in a portion 11' integral with the fixed boxed body 11.
- a sleeve 19 is mounted in a non-friction plastic material.
- the slotted holes 18 have dimensions in height equal to the diameter of the shaft with the non-friction sleeve 16, 19 and in length greater than this diameter, the length extending horizontally. In this way, the shaft with the non-friction sleeve 16, 19 may turn and translate horizontally in the slotted holes 18 in parallel to itself, without however being able to move in height. To help its translation movements, the shaft with the non-friction sleeve 16, 19 rests on two horizontal guiding surfaces 20 to the side of the slotted holes 18.
- the shaft 16 forming the axis of oscillation Y of the backrest support is placed on the bisector of the maximum angle of aperture between the fixed body and the seat support and having the axis of oscillation X of the latter as vertex.
- the synchronized movements of the supports 13, 14 are opposed, by elastic means as is usual, that is springs 21 tending to recover the initial position of the components once the action that caused the change in tilt has ceased.
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
An oscillating support unit for chairs with seat and backrest having synchronized variable tilting, in which the backrest support (14) is jointed, in its front portion, to the boxed body (11) on an axis of oscillation (Y) parallel to the axis of oscillation (X) of the seat support (13). In addition, the backrest support (14) is connected, without sliding, to the seat support (13) by means of an intermediate transverse shaft, in slotted holes (18) obtained in a portion of the boxed body with the possibility to translate horizontally, in parallel to itself.
Description
- The present invention pertains in general to chairs with seat and backrest having synchronized variable tilting, and more specifically an oscillating support unit for the elements of the seat of such chairs.
- Various constructions of chairs and armchairs, especially for offices, are known in which seat and backrest have synchronized variable tilting, that is to say susceptible to independent angular movements on corresponding axes of horizontal rotation. In practice, the seat may tilt gradually upwards and with respect to a fixed body supported by a base while the backrest varies its tilt automatically according to the arrangement of the seat, or vice versa. The synchronization of the movements is obtained through an articulated joint with parallel axes of the seat supports and of the backrest between them and at the stationary support body and with the aid of opposing elastic elements.
- In some known embodiments, the articulated joint between said supports is obtained with lever mechanisms or with synchronization connectors that make it possible to compensate reciprocal sliding of the supports oscillating on different axes.
- In other embodiments, the freedom of reciprocal sliding between said supports is achieved by introducing the articulation axis connecting the supports of seat and backrest through a slot.
- It is an object of the present invention to provide an oscillating support unit for the kind of chairs and armchairs described above, whose components have an original arrangement and combination and improved features of simplicity and efficiency without resorting to additional levers or connectors.
- Such an object is achieved with an oscillating support unit for chairs with seat and backrest having synchronized variable tilting according to claim 1.
- Further details of the invention will anyhow become apparent from the continuation of the description made with reference to the accompanying drawings in which:
- Figure 1 is a plan view of the support unit;
- Figure 2 is its side view;
- Figure 3 is a longitudinal cross-sectional view according to line III-III in Fig. 1; and
- Figure 4 shows a transversal cross-sectional view according to line IV-IV in Fig. 1.
- The unit at issue essentially comprises a
boxed body 11 fixed to the top of a supporting upright 12 which rises on a base -not illustrated- and usually at an adjustable height, asupport 13 for the seat and asupport 14 for the backrest of the seat. - The
boxed body 11 is fixed and has an invariable arrangement and extends forwards overhanging the supporting upright 12. Theseat support 13 is jointed, at the front, to the front of the fixedboxed body 11 on an axis X oriented transversely to the seat. Saidsupport 13 extends backwards overhanging with the possibility of oscillating over the fixedbody 11. For its part, thebackrest support 14 is connected to theseat support 13, without sliding, by means of atransverse shaft 15 for their combined oscillations in response to the oscillation of one of them. - In its front portion the
backrest support 14 is also jointed to the fixedboxed body 11 on an axis Y parallel to the axis of oscillation X of theseat support 13. The axis Y is formed by ashaft 16 fixed between twolugs 17 integral with theseat support 13, and thisshaft 16 extends into slottedholes 18 obtained in a portion 11' integral with the fixedboxed body 11. - On the shaft 16 a
sleeve 19 is mounted in a non-friction plastic material. The slottedholes 18 have dimensions in height equal to the diameter of the shaft with thenon-friction sleeve non-friction sleeve holes 18 in parallel to itself, without however being able to move in height. To help its translation movements, the shaft with thenon-friction sleeve surfaces 20 to the side of the slottedholes 18. - With such an assembly of
components seat support 13 on the relative X axis is automatically transmitted to thebackrest support 14 thanks to the connecting shaft 1 for a correlated variation of the tilt of the two components. Then the backrest support 14, dragged by theseat support 13, oscillates on the Y axis. Given the parallel arrangement of the two axes of oscillation X and Y and the different distance of the connecting shaft from these axes, theshaft 16 of the backrest support is forced to translate horizontally as it is thus possible due to the slotted holes. The same clearly occurs with the application of a force on the backrest in the sense of moving it angularly. - To minimize the horizontal translation of the
shaft 16 as a consequence of the synchronized oscillations of the seat and backrest, theshaft 16 forming the axis of oscillation Y of the backrest support is placed on the bisector of the maximum angle of aperture between the fixed body and the seat support and having the axis of oscillation X of the latter as vertex. - In any case, the synchronized movements of the
supports springs 21 tending to recover the initial position of the components once the action that caused the change in tilt has ceased.
Claims (4)
- An oscillating support unit for chairs with seat and backrest having synchronized variable tilting, comprising a boxed body (11) applied on the top of a support upright (12), a seat support (13) and a backrest support (14) and in which the boxed body (11) is fixed and has an invariable arrangement and the seat support (13) is jointed, in its front portion, to the front portion of said boxed body (11) on an axis of oscillation (X) oriented transversely to the seat, characterized in that the backrest support (14) is jointed, in its front portion, to the boxed body (11) on an axis of oscillation (Y) parallel to the axis of oscillation (X) of the seat support (13), in that said backrest support (14) is connected without sliding to the seat support (13) by means of an intermediate transversal shaft, and in that said axis of oscillation (Y) of the backrest support (14) is formed by a shaft (16) which extends in slotted holes (18) obtained in a portion of the boxed body with the possibility of translating horizontally, parallel to itself, as a consequence of the synchronized oscillations of said supports.
- An oscillating unit according to claim 1, wherein said shaft (16) forming the axis of oscillation (Y) of the backrest support (14) is fixed between two lugs (17) integral with said support (14), and is enclosed in a sleeve (19) of non-friction material.
- An oscillating unit according to claims 1 and 2, wherein said shaft (16) with non-friction sleeve (19) rests on horizontal sliding surfaces (20) to the side of the slotted holes.
- An oscillating unit according to the above claims, wherein the axis of oscillation (Y) of the backrest support (14) is placed, preferably, on the bisector of an angle of maximum aperture between the boxed body and the seat support and having the axis of oscillation (X) of said seat support as vertex.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT94BS000085U IT234647Y1 (en) | 1994-10-20 | 1994-10-20 | OSCILLATING SUPPORT UNIT FOR CHAIRS WITH SEAT AND BACKREST WITH SYNCHRONIZED VARIABLE INCLINATION |
ITBS940085 | 1994-10-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0707817A1 true EP0707817A1 (en) | 1996-04-24 |
Family
ID=11345371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95830265A Ceased EP0707817A1 (en) | 1994-10-20 | 1995-06-23 | Oscillatilng support unit for chairs with seat and backrest having synchronized variable tilting |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0707817A1 (en) |
IT (1) | IT234647Y1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT234647Y1 (en) | 1994-10-20 | 2000-03-13 | Cofemo Spa | OSCILLATING SUPPORT UNIT FOR CHAIRS WITH SEAT AND BACKREST WITH SYNCHRONIZED VARIABLE INCLINATION |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4013257A (en) * | 1975-04-17 | 1977-03-22 | The Shaw-Walker Company | Chair control |
US4830431A (en) * | 1987-08-24 | 1989-05-16 | Noboru Inoue | Interlocking cushioning mechanism for supporting seat portion and backrest of chair in integral fashion |
DE4303351A1 (en) * | 1992-02-06 | 1993-10-14 | Froli Kunststoffe Heinrich Fro | Swivel chair with inclined boom - has triangular base on boom connected, at apex, to column and foot and, at base of triangle to seat, boom has housing with spring and support fro pivot shaft at front of seat |
EP0636329A1 (en) * | 1993-07-27 | 1995-02-01 | UCHIDA YOKO Co., Ltd. | Chair |
ITBS940085U1 (en) | 1994-10-20 | 1996-04-20 | Cofemo Spa | OSCILLATING SUPPORT UNIT FOR CHAIRS WITH SEAT AND BACKREST WITH SYNCHRONIZED VARIABLE INCLINATION |
-
1994
- 1994-10-20 IT IT94BS000085U patent/IT234647Y1/en active IP Right Grant
-
1995
- 1995-06-23 EP EP95830265A patent/EP0707817A1/en not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4013257A (en) * | 1975-04-17 | 1977-03-22 | The Shaw-Walker Company | Chair control |
US4830431A (en) * | 1987-08-24 | 1989-05-16 | Noboru Inoue | Interlocking cushioning mechanism for supporting seat portion and backrest of chair in integral fashion |
DE4303351A1 (en) * | 1992-02-06 | 1993-10-14 | Froli Kunststoffe Heinrich Fro | Swivel chair with inclined boom - has triangular base on boom connected, at apex, to column and foot and, at base of triangle to seat, boom has housing with spring and support fro pivot shaft at front of seat |
EP0636329A1 (en) * | 1993-07-27 | 1995-02-01 | UCHIDA YOKO Co., Ltd. | Chair |
ITBS940085U1 (en) | 1994-10-20 | 1996-04-20 | Cofemo Spa | OSCILLATING SUPPORT UNIT FOR CHAIRS WITH SEAT AND BACKREST WITH SYNCHRONIZED VARIABLE INCLINATION |
Also Published As
Publication number | Publication date |
---|---|
IT234647Y1 (en) | 2000-03-13 |
ITBS940085U1 (en) | 1996-04-20 |
ITBS940085V0 (en) | 1994-10-20 |
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