EP0515120A1 - Siège basculant - Google Patents
Siège basculant Download PDFInfo
- Publication number
- EP0515120A1 EP0515120A1 EP92304474A EP92304474A EP0515120A1 EP 0515120 A1 EP0515120 A1 EP 0515120A1 EP 92304474 A EP92304474 A EP 92304474A EP 92304474 A EP92304474 A EP 92304474A EP 0515120 A1 EP0515120 A1 EP 0515120A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- seat assembly
- stand
- rocking chair
- chair according
- chair
- 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
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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
- A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
- A47C3/02—Rocking chairs
- A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
- A47C3/0255—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame pivotally mounted in the base frame, e.g. swings
Definitions
- This invention relates to a rocking chair.
- Rocking chairs commonly consist of a conventional seat, usually provided with a back-rest, mounted on a pair of arcuate rockers. Such a rocking chair is usually able to be displaced by only a relatively small angle from its equilibrium position without becoming unstable.
- the springs if sufficiently resilient to perform their function, necessarily have an effect on the characteristics of the chair.
- the effect of the springs is noticeably to reduce the period of its oscillations. This is undesirable, and can give rise to discomfort.
- the "feel" of the chair, from the occupant's point of view, is tarnished, and this is particularly evident at the extremes of its oscillation.
- the present invention seeks to provide a rocking chair in which the occupier is virtually unable to cause instability during normal use of the chair, but in which the extent to which the chair may rock is not detrimentally affected.
- the extent to which a chair according to the present invention may rock may be substantially enhanced as compared with standard or sprung rocking chairs.
- a rocking chair which comprises a support stand; a seat assembly; and pivot means for pivotally mounting the seat assembly on the stand about any one of a plurality of axes of the seat assembly.
- the chair Stability of the chair is ensured by the fact that the moving parts, i.e. the seat assembly, are isolated from those parts which touch the ground, i.e. the support stand. So long as the stand defines an area within whose bounds the vertical from the centre of gravity of the occupied chair reaches the ground, whatever the orientation of the seat assembly, then the chair will be relatively stable. Larger stands ensure better stability, although it is, of course, perfectly possible for the stand to be rigidly attached to the floor, which would have the same effect. Furthermore, given a high enough stand, the chair should be much easier than prior chairs for the elderly or infirm to get into and out of.
- the chair is capable of oscillations of relatively large amplitude since the motion of the seat assembly is not fettered by contact with the ground. Indeed, it is possible to construct the chair according to the invention which is capable of executing a complete revolution.
- the centre of gravity of the seat assembly In order for the oscillations of the chair to possess a natural period of the order of a few seconds which represents a typical and preferred period, and in order for the effort required to force the oscillations to be kept to a minimum, it is desirable for the centre of gravity of the seat assembly, when occupied, to be within a distance of 2.5-5.1cm from the axis about which the seat assembly is mounted on the stand. To ensure that this criterion can be met for a wide variety of shapes and sizes of occupant, a plurality of possible pivot axes are provided, the occupant choosing the particular axis which suits his requirements best. This set up offers the longest oscillation.
- a simple mechanical device could lower the seat assembly so that the centre of gravity is more than 5.1cm from the pivot axis for the seat assembly.
- the preferred embodiment of the invention possesses such a device.
- the chair may also comprise locking means operable to prevent relative motion of the seat assembly and the stand.
- the locking means are operable with the seat assembly in any one of a plurality of orientations.
- These locking means may comprise an arcuate locking bar provided on either the seat assembly or the stand and engaging means on the other of the seat assembly and the stand for engaging the locking bar.
- the locking bar includes a plurality of apertures spaced along its length and the engaging means comprises a bolt or peg movable between an extended position, in which it is adapted to be inserted into the apertures, and a retracted position.
- a straight bar with apertures arranged in an arc could be used.
- the stand includes a pair of support columns, each having a bearing assembly at its upper end.
- each bearing assembly includes an axle
- the seat assembly includes a pair of arms, each arm having a pair of spaced side plates and each side plate including a plurality of slots, each axle being receivable in any one of the respective plurality of slots.
- the seat assembly comprises a cradle and a detachable seat unit and the pivot means are for pivotally mounting the cradle on the stand.
- the cradle may be dispensed with, and the chair may consist of a detachable seat assembly having a pair of generally triangular side frames with suitable upholstery supported thereon like a deck-chair, mounted on a pair of spaced A-frames which may be collapsible, the cross pieces of which comprise an apertured locking bar.
- the overall width of the chair can be reduced by keeping the arms of the respective side frames of the seat assembly, which support the seat, above their respective A-frame stands.
- a "waisted" effect can be created by constructing the arms of each side frame which provide the seat and back of the seat assembly so that they taper to their meeting point, in order to clear the stands during rocking. As oscillation of the seat assembly reaches its limit fore and aft, the back and seat make contact with the stands, to provide safety stops.
- the chair includes adjustment means for raising and lowering the centre of gravity of the seat assembly with respect to its pivotal connection to the stand and/or for adjusting the angle at which the seat assembly is at rest.
- the adjustment means comprises an adjustment member pivotally attached directly or indirectly to the seat assembly at a mid point, one end of which member is adapted to be adjustably attached directly or indirectly to the seat assembly, the other end of which is adapted pivotally to be connected directly or indirectly to the stand.
- the said one end of the adjustment member may be adapted to be bolted to the seat assembly in a number of different relative positions; but in preference, the said one end is movably connected to the seat assembly.
- the seat assembly may be provided with a worm screw, which carries a threaded cooperating element, held against rotation with respect to the seat assembly, the said one end of the adjustment member being linked to the said element.
- the worm screw may be manually rotatable, eg. by means of a knurled knob, or may be motorized, eg. by a stepping motor controlled in response to input to a control panel by the occupant of the chair.
- the seat assembly include two, laterally spaced such adjustment members, linked to move in unison.
- the rocking chair consists of a support stand (10) and a seat assembly (12) pivotally mounted thereon about a pair of bearing assemblies (14).
- the support stand (10) consists of a U-shaped member, (16) which provides a pair of support columns (18) each having a bearing assembly (14) at its upper end, and a pair of inverted, shallow U-shaped feet (34).
- the seat assembly consists of a cradle (20) having a detachable seat unit (22) mounted thereon.
- the seat unit (22) is formed of a rigid frame, constructed from wooden frame members (24, 26, 28), and upholstery (30, 32).
- the bearing assemblies (14) may be mounted in any one of a plurality of transverse slots (36, 36′) provided in arms (21) the cradle (20).
- the reclining position of the rocking chair illustrated in Fig. 2 and positions between the two shown in Figs. 1 and 2 may be maintained by suitable shifts of weight by the occupant.
- the position in which the chair most easily remains stable is determined by the particular slots in which the bearing assemblies are located and by the weight distribution of the occupant.
- the degree to which the chair of Figs. 1 and 2 may rock is limited only by the cradle (20) making contact with the support columns (18). Of course, with different bearings, the chair may potentially rotate completely.
- the bearing assembly (14) and associated slots (36, 36′) are shown in more detail in Figs. 3-5.
- the portion of the cradle (20) which forms the pivotal mounting with the support column (18) is formed from sheet metal, which is bent into a channel section and provides a pair of side plates (38; 40).
- the slots (36, 36′) are provided in each side plate (38; 40), and an axle (42) is fixed into one of the slots (36, 36′) in one side plate (38) and a corresponding one of the slots in the remaining side plate (40).
- the axle (42), in the form of a bolt, is fixed into the slots by a nut (44).
- the axle passes through, and rotates within, the cross-piece (58) of a generally T-shaped assembly (48) at the top of the support column (18), and is free to rotate therein on bearings (50).
- the bolt has a washer (46) on each end.
- the upright (60) of the T-shaped assembly engages a circular projection, provided for the purpose on the top of its support column (18), and is retained thereby.
- the rocking chair illustrated in Fig. 6 is substantially identical to that of Figs. 1 and 2, but an arcuate locking bar (52) is secured to each of its support columns 18, just above the respective feet 34.
- a plurality of apertures (54, 54′) are provided in each locking bar, and the seat assembly (12) is provided with a movable peg (56) which may locate in any one of the apertures (54, 54′) to lock the chair in an upright or an inclined position.
- the chair may consist of a generally detachable tubular metal seat assembly (60) made of a pair of spaced, generally triangular side frames with stretched canvas upholstery, in the manner of a deck-chair, mounted on a stand formed from two spaced collapsible A-frames (62) as shown in Figure 7.
- the cross-pieces of the A-frames may constitute an arcuate locking bar, similar to that described above, or be straight with arcuately located apertures, as shown at (64) in Figure 7.
- the seat assembly may be generally rectangular in plan, with outboard bearing assemblies, or for example as shown in Figure 8.
- each generally triangular side frame (60) has a first arm (66) overlying the apex of its respective A-frame (62), with its bearing assembly (14) located beneath the arm (66), and its other two arms (68) and (70) taper inwardly to their meeting points (72), so that they clear the A-frame stands (62).
- the seat assembly which includes an upholstered or canvas seat (74) and back (76)
- the arms (68) and (70) make contact with the A-frames, thus providing safety stops.
- a locking bar is also provided, as described with reference to Figure 7.
- the chair may also be provided with an adjustable head rest (77).
- the lateral clearance between the seat assembly and the stand be sufficiently large to accommodate the fingers or hand. This substantially reduces the likelihood of injury due to the fingers etc. being caught between moving parts.
- the outboard bearings mentioned above represent one way of ensuring a sufficient clearance.
- FIG. 9 there is illustrated the preferred mechanism for adjusting the axis about which the seat assembly pivots, according to the second aspect of the invention.
- One side only is illustrated, but it will be apparent that the other side is identical, but a mirror image. In reality, the mechanism shown would be enclosed behind a shield or guard to minimise potential hazards.
- the mechanism includes an elongate adjustment member (100) pivotally attached to the seat assembly (12), at a pivot (101), the assembly (12) being cut away to allow the mechanism to be seen.
- One end (104) of the adjustment member carries an elongate aperture (106); the other end (102) is adapted to provide a pivotal connection (not shown) to the stand.
- a worm screw (108) To either the bottom of the seat assembly (12) (as illustrated) or to the back of the assembly (corresponding to rotation of Fig. 9 anti-clockwise by 90°) is attached a worm screw (108), held in place by brackets (110), one of which is illustrated.
- the worm screw (108) in turn carries a circular nut (112) which is provided with a connecting rod (114) on either side.
- the connecting rods (114) slide against rails (not shown) at the sides of the seat assembly (12), hence preventing rotation of the circular nut (112) with respect to the seat assembly (12). Accordingly, rotation of the worm screw (108), whether manually or by a stepping motor (not shown), is converted into translation of the connecting rods (114).
- each connecting rod (114) first passes through the elongate aperture (106) in its respective adjustment member (100) and then terminates in a brazed-on or welded-on washer (116).
- the chair should include two mechanisms as illustrated in Fig. 9, one having its associated worm screw attached to the base of the seat assembly, the other to the back.
- the mechanisms would be “nested” in the sense that the inner mechanism is not directly pivotally attached to the stand, but provides the pivot, equivalent to pivot (101), for the outer mechanism. As many mechanisms as may be desired can be nested in this way.
Landscapes
- Chairs Characterized By Structure (AREA)
- Chair Legs, Seat Parts, And Backrests (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9110597 | 1991-05-16 | ||
GB919110597A GB9110597D0 (en) | 1991-05-16 | 1991-05-16 | A rocking chair |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0515120A1 true EP0515120A1 (fr) | 1992-11-25 |
EP0515120B1 EP0515120B1 (fr) | 1995-09-13 |
Family
ID=10695090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92304474A Expired - Lifetime EP0515120B1 (fr) | 1991-05-16 | 1992-05-18 | Siège basculant |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0515120B1 (fr) |
AT (1) | ATE127669T1 (fr) |
DE (1) | DE69204740T2 (fr) |
GB (1) | GB9110597D0 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2712783A1 (fr) * | 1993-11-25 | 1995-06-02 | Belentrin | Siège de relaxation à balancement continu. |
EP1050249A1 (fr) * | 1999-05-06 | 2000-11-08 | Louis Ellgass | Chaise basculante |
DE19938334A1 (de) * | 1999-08-13 | 2001-03-08 | Klaus Mildenberger | Schwenkbares Möbelstück |
FR2862500A1 (fr) * | 2003-11-20 | 2005-05-27 | Didier Monard | Siege articule a positionnement automatique |
GB2456044B (en) * | 2007-12-27 | 2011-04-27 | Abolkheir Group | A rocking chair mechanism |
GB2511031A (en) * | 2012-12-22 | 2014-08-27 | Roger Hollest | A rocking chair |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1544187A (en) * | 1924-03-10 | 1925-06-30 | Schroeder Peter | Chair |
US2611419A (en) * | 1945-12-26 | 1952-09-23 | Leon L Mckinney | Reclining self-adjusting chair |
US4341420A (en) * | 1980-08-11 | 1982-07-27 | Knowles William F | Lounge chair |
-
1991
- 1991-05-16 GB GB919110597A patent/GB9110597D0/en active Pending
-
1992
- 1992-05-18 AT AT92304474T patent/ATE127669T1/de not_active IP Right Cessation
- 1992-05-18 DE DE69204740T patent/DE69204740T2/de not_active Expired - Fee Related
- 1992-05-18 EP EP92304474A patent/EP0515120B1/fr not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1544187A (en) * | 1924-03-10 | 1925-06-30 | Schroeder Peter | Chair |
US2611419A (en) * | 1945-12-26 | 1952-09-23 | Leon L Mckinney | Reclining self-adjusting chair |
US4341420A (en) * | 1980-08-11 | 1982-07-27 | Knowles William F | Lounge chair |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2712783A1 (fr) * | 1993-11-25 | 1995-06-02 | Belentrin | Siège de relaxation à balancement continu. |
EP1050249A1 (fr) * | 1999-05-06 | 2000-11-08 | Louis Ellgass | Chaise basculante |
DE19938334A1 (de) * | 1999-08-13 | 2001-03-08 | Klaus Mildenberger | Schwenkbares Möbelstück |
DE19938334B4 (de) * | 1999-08-13 | 2005-08-04 | Klaus Mildenberger | Schaukelstuhl und/oder -liege |
FR2862500A1 (fr) * | 2003-11-20 | 2005-05-27 | Didier Monard | Siege articule a positionnement automatique |
WO2005051132A1 (fr) * | 2003-11-20 | 2005-06-09 | Didier Monard | Siege articule a positionnement automatique |
GB2456044B (en) * | 2007-12-27 | 2011-04-27 | Abolkheir Group | A rocking chair mechanism |
GB2511031A (en) * | 2012-12-22 | 2014-08-27 | Roger Hollest | A rocking chair |
Also Published As
Publication number | Publication date |
---|---|
DE69204740T2 (de) | 1996-05-02 |
EP0515120B1 (fr) | 1995-09-13 |
DE69204740D1 (de) | 1995-10-19 |
ATE127669T1 (de) | 1995-09-15 |
GB9110597D0 (en) | 1991-07-03 |
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