EP1976414A2 - Dispositif pour ajuster l inclinaison d un dossier ou siege d une chaise - Google Patents
Dispositif pour ajuster l inclinaison d un dossier ou siege d une chaiseInfo
- Publication number
- EP1976414A2 EP1976414A2 EP06831792A EP06831792A EP1976414A2 EP 1976414 A2 EP1976414 A2 EP 1976414A2 EP 06831792 A EP06831792 A EP 06831792A EP 06831792 A EP06831792 A EP 06831792A EP 1976414 A2 EP1976414 A2 EP 1976414A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- follower
- cam
- bracket
- rod
- constrained
- 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.)
- Withdrawn
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
- A47C1/03294—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
Definitions
- the present invention concerns ⁇ device for adjusting the tilt (i.e. inclination) of a movable component, for example the backrest and/or the seat, of a chair;
- Said device is particularly suitable for use in chairs in which, for example due to prolonged use thereof, the user requires the most comfortable position possible.
- office chairs on which the user is normally sitting for long periods of time must be ergonomic and it must be easy to adjust the position chosen by the user.
- Said chairs are generally provided with at least one movable component, i.e. the backrest and/or the seat and even the armrests and/or footrests, which is constrained, with one or more degrees of freedom, to another movable component or to a chair supporting structure on the ground, for example a base or pedestal.
- movable components can, within certain limits, be moved to translate and/or rotate with respect to one another and/or with respect to any fixed components, and can therefore be adjusted by the user, thus obtaining optimal reciprocal arrangements for the comfort of said user.
- chair we mean, here and hereinafter, a generic seating means such as sofas, armchairs or car seats, even though particular reference will be made to office chairs, provided with seat and/or backrest that are movable with respect to the base.
- devices exist for adjusting the tilt of a movable component of the chair, and in particular of the backrest and/or seat, comprising a cam, usually constrained in a revolving manner to the base of the chair, and a follower which is integral with or in any case constrained to said movable component.
- Rotation of the cam which can be operated by a user by means, for example, of an appropriate control rod, determines the relative movement of the follower on the profile of the cam, with consequent variation in the relative position of the follower with respect to the centre of rotation of the cam, and therefore the translation and/or rotation of the movable component with respect to the chair.
- means for fixing the position are operated, for example consisting of a threaded pin and a corresponding housing, which can be engaged between the movable component and the chair and are furthermore configured to lock the above-mentioned movable component in the chosen position.
- Said fixing means have the purpose of preventing the load exerted by the user on the movable component from inducing undesired movements of the follower with respect to the cam and consequently loss of the optimal position adjusted by the user.
- the known devices of the type mentioned above while allowing considerable freedom in the configuration and reciprocal arrangement of the cam and follower, are complex to produce due to the above-mentioned fixing element, and furthermore do not permit adjustment and fixing of the above-mentioned movable component in one single operation. Furthermore, fixing of the mobile component in said devices can be laborious and inaccurate, due to possible undesired movements of said movable component between the adjustment and fixing operations.
- the object of the present invention is to remedy the drawbacks of the adjustment devices described above, and in particular of those that make use of devices for adjusting the tilt of the seat or backrest, or other movable component, via the use of cam and follower mechanisms.
- a further aim of the present invention is to make possible adjustment of the backrest or seat of the chair once the most comfortable position for the user has been determined, without having to fix the movable component with respect to the chair.
- the device for adjusting the tilt of a movable component of a chair comprises at least one cam, constrained in a rotating (i.e. revolving) manner to a bracket and at least one follower, constrained in a sliding manner to the profile of said cam.
- the movable component of the chair is furthermore integral with the follower, and hence the bracket is fixed with respect to the latter or, vice versa, the movable component is integral with the bracket and therefore the follower is fixed with respect to the latter.
- the device furthermore comprises means for constraining the follower to the bracket. Furthermore said constraining means and the cam are configured so that the constraint reaction of the follower on the cam is substantially always directed towards the centre of instantaneous rotation (i.e. the swing center) of the latter.
- the geometric configuration of the cam and the use of appropriate constraints for the follower suitable for countering the forces acting on the follower with the exception of those forces directed towards the centre of instantaneous rotation of the cam, and which can be obtained, for example, by imposing a certain path on the follower in contact with the cam, prevents the forces exerted by the follower on the cam, and generated by the load exerted by the user on the above-mentioned movable component, generating a non-null moment on said cam which can cause undesired rotation.
- the device of the present invention makes the use of auxiliary means for fixing the follower and the corresponding cam in the reciprocal relative position superfluous.
- the above-mentioned means for constraining the follower to the bracket comprise a lever hinged to the bracket and preferably integral, at its non-hinged end, with the above-mentioned follower, which can advantageously consist of a driven rod sliding in a guide obtained on the cam and defining the profile of the latter.
- the contact point of the driven rod on the cam profile, the profile of the latter and the arrangement of the lever that rotates said driven rod are such that the forces, not countered by other constraints, acting on the driven rod at the contact point on the cam, and therefore transmitted to the latter, are directed orthogonally to the rotation radius of the lever and in the direction of the centre of instantaneous rotation of the cam.
- the movable component of the chair can be integral with the lever.
- the above-mentioned follower of the adjustment device can be constrained in a sliding manner in a linear guide, integral with said bracket.
- the function of said guide can be multiple: firstly it can act as a stroke limiter for said follower, for example if the latter is already otherwise constrained to the bracket, secondly it can act as a constraint to counter all the forces acting on the follower not directed towards the centre of instantaneous rotation of the cam, imposing for example a precise path on the follower, in its movement relative to the cam, with respect to the bracket.
- figure 1 is a perspective view of the device according to the invention in a position of minimum tilt of the movable component
- figure 2 is a perspective view of the device according to the invention in a position of maximum tilt of the movable component
- figures 3a-3c are lateral views partially in section of the device of figures 1 and 2, showing the reciprocal positions of the follower and cam respectively in the position of minimum tilt, intermediate tilt and maximum tilt of a movable component of the chair.
- 1 indicates a device for adjusting the tilt of a movable component of a chair, and in particular W
- the particular adjustment device 1 herein described comprises a bracket 2 which is fixed, by means of appendixes 7 provided with holes 9 suitable for housing threaded locking means, to a stable component of the chair, for example the base, and bears two parallel cams 16, 17, constrained to said bracket 2 to revolve around a same axis B-B, by means of a rod 14.
- the axis B-B on the planes on which the two parallel cams 16 and 17 lie respectively determines the centres of instantaneous rotation 14' (see figures 3a-3c) of the latter.
- the bracket 2 is a structure, preferably metallic, consisting of longitudinal members 4 and transverse plates, or cross members, 5, variously shaped and reciprocally fixed, for example by welding.
- the bracket 2 at one end, comprises two projecting terminal portions 10, inside which holes 12 are obtained for housing the above- mentioned rod 14 so that it is free to rotate.
- the rod 14 is preferably cylindrical with circular section and is integral, at its ends, with the two parallel cams 16, 17. Said cams 16, 17 can be rotated, by the user, by means of a knob 35, mounted integral and coaxial on said rod 14, and protruding laterally frorp the structure of the chair. Furthermore, the eccentric profile of the two cams 16 and 17, defined, in the particular embodiment of the present invention illustrated here, by two substantially spiral-shaped grooves 23 (of which only the groove of the cam 16 can be seen), is specular with respect to any plane orthogonal to the above-mentioned axis B-B.
- the bracket 2 furthermore comprises holes 21 , 22 in which two levers 18 (only one of which can be seen in the figures) are hinged at one of their ends 19; at their other end 20, said levers bear a driven rod 15 which extends between said levers 18.
- the driven rod 15, integral in a substantially perpendicular manner with said levers 18, is in turn constrained to run along the eccentric profile of the cams 16, 17, due to the engagement of its ends in the grooves 23 defining said profile.
- the rod 15 in particular, develops along an axis A-A parallel to the axis B-B of rotation of said cams l ⁇ , 17 and is furthermore constrained to run inside two elongated slots 13, appropriately arc-shaped, obtained on the two terminal portions 10 of the bracket 2 and defining a linear guide for said rod 15.
- the rod 15, due to its constraint with the grooves 23 of the cams 16, 17, constitutes a follower moving on the profile of said cams 16, 17, obliged to follow a well-defined path, moving close to and away from the centres of rotation of the two cams 16, 17, due to the particular modes of constraint with the bracket 2.
- the linear guides 13 perform the function of stroke limiter for the rod 15 and therefore of rotation limiter for the two levers 18. It should furthermore be noted that, according to a particular aspect of the present invention, in the tilt adjustment device 1 , the levers 18, and/or the driven rod 15 can be preferably integral with the movable component of the chair to be inclined, for example the backrest or the seat of the chair.
- the constraint of the rod 15 to the bracket 2, consisting of the levers 18, substantially prevents forces directed longitudinally to the rotation radius of the lever 18 (and in this case to the lever 18 itself which extends in a straight line), independently of the load acting on the latter, occurring on the rod 15, therefore the forces acting on the rod 15 and transmitted to the relative cams 16, 17 are only orthogonal to the respective rotation radiuses of said levers 18.
- the configuration of the profiles 23 of the cams 16, 17 and the reciprocal arrangement of the rod 15 on the profiles 23 are such that the forces transmitted by the rod 15 to the cams 16, 17 are practically always directed towards the centres of instantaneous rotation 14' of the cams 16, 17.
- any transverse forces with respect to the straight line, which joins on each cam 16, 17 the contact point of the follower 15 on the profile of said cam 16, 17, which could generate a non-null moment on the latter are obstructed and compensated for by the presence of the lever 18 (non-deformable), and in a redundant manner by the constraint reaction exerted by the linear guides 13, while the forces parallel to said straight line, and directed by geometric configuration of the parts towards the centre 14' of the cams 16, 17, are compensated for by the constraint reaction of the support (and possibly by the relative friction) of the end of the rod 15 on the eccentric profile 23 of each cam 16, 17.
- the engagement of the ends of the driven rod 15, acting as follower, in the grooves 23 means that any, albeit improbable, forces acting on said driven rod 15 in a direction parallel to the above- mentioned straight line defined by the centre of rotation of each cam 16, 17 and by the contact point of each end of the rod 15 with the profile of the relative cam 16, 17, and in the opposite direction with respect to the centre of rotation of the cams 16, 17, are compensated for by the constraint reaction exerted by the upper walls of each groove 23.
- the linear guides, or curved slots, 13 have above all the function of limiting the stroke of the follower 15 and therefore the rotation of the levers 18.
- the device 1 can alternatively comprise any type of constraint of the follower 15 to the bracket 2, also indirect, or obtained by interposition of parts connected in a fixed or movable fashion to the bracket 2, on condition that said constraint allows the follower 15 to translate or rotate with respect to said bracket 2 according to a well-defined path and at the same time guarantees the sliding contact movement of said follower 15 on the profile of the cam or cams 16, 17 so that the constraint reactions (or the forces transmitted) by the follower 15 on said cams 16, 17 are always directed towards the centres of instantaneous rotation of the latter.
- the follower 15 variously constrained to the movable component of the chair, could be made to slide in a straight linear guide (not shown) which imposes on said follower 15 one single path passing through the centre of instantaneous rotation 14' of the cam or cams 16, 17, thus allowing the follower 15 to transmit to the cams 16, 17 only forces directed along said path, the force application axes of which therefore pass, without the generation of non-null moments, through the centres of instantaneous rotation of the cams 16, 17.
- the path followed by the driven rod 15 with respect to the bracket 2 is ideally positioned on a plane parallel to the planes on which the cams 16, 17 rotate, thus facilitating translation of the resting point of the rod 15, also preferably cylindrical with circular section, on the profile of each cam 16, 17 with respect to the centre of rotation of the latter.
- the present patent is not limited, as a person skilled in the art will easily realise, to the fact that the bracket 2 is constrained to a fixed component of a chair and the follower 15 is integral with the movable component to be inclined, since each kinematic or structural inversion of the device falls equally within the scope of the protection requested.
- the rotation of the knob 36 by the user determines the integral rotation, around the axis A-A, of the rod 14 in the holes 12 and therefore of the cams 16, 17 with respect to the bracket 2 and with respect to the follower, or driven rod, 15.
- Said rotation of the cams 16, 17 thus causes simultaneous movement, to the same extent, of the ends of the driven rod 15 moving away from the centre of rotation of the cams 16, 17 due to the ends of the rod 15 resting within the eccentric profile, in particular spiral-shaped, of the cams 16, 17, defined by the grooves 23.
- Sliding of the rod 15 along the profile of the cams 16, 17 is furthermore constrained by the presence of the levers 18, and also by the linear guides 13, which determine the only possible rotation of the rod 15 around the hinge axis C-C of said levers 18.
- the stability of the relative position of the rod 15 resting on the profile of the cams 16, 17, countering any load present on the movable component constrained to the levers 18, is ensured by the revolving constraint (i.e. the constraint in a rotation manner) provided by said levers 18 and/or by the sliding constraint given to the rod 15 by the slots, or linear guides, 13 obtained on the bracket 2, by the geometric configuration of the parts, and by the contact, with relative friction, of the rod 15 within the profile 23 of the cams 16, 17.
- Said factors require the direction of the forces exerted by the rod 15 to pass through the centre of instantaneous rotation 14' of the cams 16, 17, preventing the generation of torques which would induce undesired rotations of said cams 16, 17.
- rotation of the knob 36 in this case anti-clockwise would determine the consequent relative rotation of the cams 16, 17 with respect to the driven rod, or follower, 15, causing the relative movement thereof with respect to the rod 14 and therefore rotation of the levers 18 towards an increasingly small angle of tilt with respect to the bracket 2.
Landscapes
- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Chairs Characterized By Structure (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
La présente invention concerne un dispositif (1) pour ajuster l'inclinaison d'au moins un composant mobile d'une chaise, du type comprenant au moins une came (16, 17), contrainte de façon rotative sur un support (2), et au moins un suiveur (15) contraint de façon coulissante sur le profil (23) de ladite came, le composant mobile étant solidaire du suiveur et le support étant fixe par rapport au suiveur ou vice versa. Le dispositif comprend en outre des moyens (13, 18) pour contraindre le suiveur sur le support, les moyens mentionnés ci-dessus (13, 18) et la came mentionnée ci-dessus (16, 17) étant conçu pour que la réaction de contrainte du suiveur sur la came soit sensiblement toujours dirigée vers le centre de rotation instantanée de cette dernière.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000022U ITMI20060022U1 (it) | 2006-01-23 | 2006-01-23 | Dispositivo di regolazione dell'inclinazione dello schienale o della seduta di una sedia |
PCT/IB2006/003748 WO2007083186A2 (fr) | 2006-01-23 | 2006-12-21 | Dispositif pour ajuster l'inclinaison d'un dossier ou siege d'une chaise |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1976414A2 true EP1976414A2 (fr) | 2008-10-08 |
Family
ID=38287983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06831792A Withdrawn EP1976414A2 (fr) | 2006-01-23 | 2006-12-21 | Dispositif pour ajuster l inclinaison d un dossier ou siege d une chaise |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100219672A1 (fr) |
EP (1) | EP1976414A2 (fr) |
IT (1) | ITMI20060022U1 (fr) |
WO (1) | WO2007083186A2 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9004597B2 (en) | 2012-09-20 | 2015-04-14 | Steelcase Inc. | Chair back mechanism and control assembly |
US11304528B2 (en) | 2012-09-20 | 2022-04-19 | Steelcase Inc. | Chair assembly with upholstery covering |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1992254A1 (fr) * | 2007-05-16 | 2008-11-19 | Effe Tre S.r.L. | Dispositif de changement de réglage d'un siège |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU5853373A (en) * | 1972-10-24 | 1975-01-30 | Ford Motor Canada | Reclining car seat |
US4062587A (en) * | 1976-01-13 | 1977-12-13 | Herman Miller, Inc. | Back position control device for chairs |
JPH0244583Y2 (fr) * | 1985-03-12 | 1990-11-27 | ||
US4709963A (en) * | 1986-12-12 | 1987-12-01 | Milsco Manufacturing Company | Adjustable office chair |
US5482350A (en) * | 1988-05-20 | 1996-01-09 | La-Z-Boy Chair Company | Linear actuation drive mechanism for power-assisted chairs |
CA2203193C (fr) * | 1994-10-17 | 2000-04-18 | Manfred Hirschmann | Support de siege pour chaises de bureau ou analogue |
US5730494A (en) * | 1995-06-07 | 1998-03-24 | La-Z-Boy Incorporated | Linear actuation drive mechanism for power-assisted chairs |
DE19849522A1 (de) * | 1998-10-21 | 2000-04-27 | Drabert Gmbh | Bürostuhl mit einer Sitzneigungsverstellung |
US6957864B2 (en) * | 2003-10-09 | 2005-10-25 | Su-Ming Chen | Chair with a stopping device |
-
2006
- 2006-01-23 IT IT000022U patent/ITMI20060022U1/it unknown
- 2006-12-21 EP EP06831792A patent/EP1976414A2/fr not_active Withdrawn
- 2006-12-21 US US12/160,923 patent/US20100219672A1/en not_active Abandoned
- 2006-12-21 WO PCT/IB2006/003748 patent/WO2007083186A2/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007083186A2 * |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9004597B2 (en) | 2012-09-20 | 2015-04-14 | Steelcase Inc. | Chair back mechanism and control assembly |
US9010859B2 (en) | 2012-09-20 | 2015-04-21 | Steelcase Inc. | Chair assembly |
US9022476B2 (en) | 2012-09-20 | 2015-05-05 | Steelcase Inc. | Control assembly for chair |
US9027997B2 (en) | 2012-09-20 | 2015-05-12 | Steelcasel Inc. | Chair assembly |
US9027998B2 (en) | 2012-09-20 | 2015-05-12 | Steelcase Inc. | Chair assembly |
US9027999B2 (en) | 2012-09-20 | 2015-05-12 | Steelcase Inc. | Control assembly for chair |
US9049935B2 (en) | 2012-09-20 | 2015-06-09 | Steelcase Inc. | Control assembly for chair |
USD742677S1 (en) | 2012-09-20 | 2015-11-10 | Steelcase Inc. | Chair |
USD742676S1 (en) | 2012-09-20 | 2015-11-10 | Steelcase Inc. | Chair |
US9345328B2 (en) | 2012-09-20 | 2016-05-24 | Steelcase Inc. | Chair assembly with upholstery covering |
US9451826B2 (en) | 2012-09-20 | 2016-09-27 | Steelcase Inc. | Chair assembly |
US9462888B2 (en) | 2012-09-20 | 2016-10-11 | Steelcase Inc. | Control assembly for chair |
US9492013B2 (en) | 2012-09-20 | 2016-11-15 | Steelcase Inc. | Chair back mechanism and control assembly |
US9526339B2 (en) | 2012-09-20 | 2016-12-27 | Steelcase Inc. | Control assembly for chair |
US9844267B2 (en) | 2012-09-20 | 2017-12-19 | Steelcase Inc. | Chair back mechanism and control assembly |
US9861201B2 (en) | 2012-09-20 | 2018-01-09 | Steelcase, Inc. | Chair assembly |
US9918552B2 (en) | 2012-09-20 | 2018-03-20 | Steelcase Inc. | Control assembly for chair |
US10206507B2 (en) | 2012-09-20 | 2019-02-19 | Steelcase Inc. | Control assembly for chair |
US11304528B2 (en) | 2012-09-20 | 2022-04-19 | Steelcase Inc. | Chair assembly with upholstery covering |
Also Published As
Publication number | Publication date |
---|---|
US20100219672A1 (en) | 2010-09-02 |
WO2007083186A3 (fr) | 2007-11-08 |
WO2007083186A2 (fr) | 2007-07-26 |
ITMI20060022U1 (it) | 2007-07-24 |
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