POSTE CENTRAL POUR SUPPORTER ET REGLER L'INCLINAISON DE CHAISES A SIEGE OSCILLANT

CENTRAL STAND FOR SUPPORTING AND ADJUSTING THE INCLINATION OF CHAIRS WITH OSCILLATING SEAT

Abrégé anglais

ABSTRACT
CENTRAL STAND FOR SUPPORTING AND ADJUSTING THE INCLINATION OF
CHAIRS WITH OSCILLATING SEAT
This invention concerns the central stand for supporting
and adjusting the inclination of the seat-back group in
chairs with an oscillating seat. The stand is composed of a
block (10,10') and a pack of sheets (11,11') integrally
united to said block.
FIGURE 1

Revendications

CLAIMS
1. A central stand for supporting and adjusting the
inclination of chairs with an oscillating seat, said stand
including a block with parallele sheets, the seat being
oscillatingly hinged on said block and having a stopping-
releasing device interacting with said sheets to stop the
seat in any incliniation, characterized in that the
supporting block (10,10') and the parallel sheets (11,11')
are integrally united.
2. Central stand as claimed in claim 1, wherein said block
(10,10') is provided with a tapered hole (12) for the
application on a base or supporting post, and a transversal
hole (14) for a pivot constituting the oscillating axe of
the seat, and wherein said sheets (11,11') have an arched
slot (15) concentric to said transverse hole in which a
pivot or tie rod of the stopping-releasing device extends.
3. Central stand as claimed in claims 1 and 2, wherein
said sheets (11) are inserted in integral sheets (25) with a
second block (24) hinged at the back stand when the back is
oscillating, the first and second block of sheets (11,25)
being stopped-released by the same device.
4. stand as claimed in claim 1, also characterized in that
said block (10') presents an expansion where a spring
contrasting the seat oscillations is applied.

Description

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The present invention relates generally to chairs and
armchairs with an oscillating seat, and more particularly tc~
a central stand for suppor-ting and adjusting the inclination
of the seat in said cl~airs and armchairs.
In some chairs and armchairs for office, the seat meal1s
formed of seat and back is ~Is~lally oscillatingly asselnbled
on a centr~l inlmovable support. Said central ~tal1d is
apylied to tlle top of a base or pOSt,ill casP adjllstablP in
h~igl-t, and besides supporting tl1e oscillating seat, it i,c
1~ provided with a pl~lrality of parallele slleets intelacting
witll a stoppil1g-rP~P~.~il1g pi~ot wl~ l1 p~P~ tllro~ tllem to
adj~lst and st~bilize ~s one wisl1es the sP~t in~ tic!n ky
means of a l1and lever.
In accordance witll tlle known embodiments, tl1e stand and
tlle parallele slleets are made of independel1t and oligil1ally
separated elements. In fact the stand is composed of a hody
or block and the slleets are thel1 joined to said body or
block by welding or by mealls of pivots, pins or like.
on the col1trary, it is an object of the presel1t invelltic~ll
,'~ to provide a central stand for chairs witl1 a new and
original sl~ape whicl1 allows a more col1vel1iel1t and cl1eap
realization and an easier and simpler arrallgement foL tl~e
assemblincJ operations.

2~3~
Another object of the invel1tion is to provide a centra]
stand for oscillating seats made of one element ol1ly,
advantageo~lsly realizable in plastic material and not
requiring welding work or junction by welding or witl
pivots, pins or like.
Said objects and advantages are obtained witl1 3 Cellt
stand essentially as claimed in claim l.
However, further details concerning the inventioll will
result clear from the following description made witl1
reference to an embodiment illustrated in the enclosed
drawings. ~n said drawings :
Fig.l shows a perspective vlew of tl~e central stal1d;
Fig.2 shows a view from above of tlle gl-o~lp s~lpporting seat
and back and embodying the stand sl1owl1 in Fig.l in
connection with a similar stand for the back;
Fig.3 shows a cross section view as indicated by the
arrows III-III in Fig.2; and
Fig.4 shows a view of a modified form of tlle stand in
Fig.l .
The central stand is composed of a block lO and a
pl~lrality of parallel sl~eets ll inteyrally joined to bk~cl:
lO, the whole in plastic material.
2loc~ lO has a tapered hole 12, where in case a blnsl1 13
may be inserted, and a transverse hole 14 in a rigl1t-angled
25 plant to tl1e tapered hole. Tl~e sheets 11 l1ave, ill a

2~8~
transverse directioll, an arched slot 15 concelltrlc to the
transverse hole 14.
On such a depicted stand, a seat-carrying oscillating
plate 16 is mounted, in the rear part of whlcll a stand 18
for a back is hillged at 17. More precisely, the described
central stand is mo-lnted on a base or supportillcJ post lq, in
case adjustable for heiyllt, whose top is tapered alld
inserted in the tapered hole 12 of the bloc~ 10 - see Fiy. 8 .
The seat-carrying plate 16 is applied to the block 10 by
1~ means of a piVc!t 20, inserted in the transverse llole 14 of
the block and constitutillg tlle oscillating axe of tl~e seat.
A stopping-releasiny device 21 act~lated by a halld level
21a is mounted Oll tlle seat-carrying plate 16 for
loc};ing/unlocking tlle sheets 11. Sucll device, whicll is
already known in the art, has a pivot or tie rod 22 wllicl
extends in the arched slot 15 of the sheets 11 and is
engaged to the plate 16.,
When the back support 18 is also oscillatillg as ShOWII in
tlle drawing, a second blocl; 24 is hillged, at 28, to said
~U bac]i support 18, alld also provided witll a pl~lrality of
sheets 25 integral with it. Said sheets 25 are directed alld
illserted in the spaces among tlle sheets 11 of tlle centLal
stand and have al~ oblong slot 26 where tlle pivot or tie rod
22 of the stopping-re].easil-g device 20 e~tends.
Th~ls, the central stand, consistillg of bloc]; lt~ inteqlal

l t~ i ~
witll the sheets 11, always re~ains fixed and immovable oll
the base or supporting post 19, while tlle seat-carryillg
plate 16 can oscillate on said central stand and the bac];
relatively ~o the seat-carrying plate. ~owever, said
oscillations are possible when the device 20 set in action
by tlle lever 21 is in the releasing position so as to let
the sheets 11,25 free.
On the contrary, seat and back can be stopped in tlle
desired inclination by acting on the lever 21 in order to
tightell and lock the sheets 11,25 by means of tl~e device '0.
Finally, in a particular realization the central stalld,
wl~ich is always provided with integral slleets 11', could
have an oblong-shaped block 10' as ShOWI~ tlle Flg.4 of the
drawins~, in order to apply also a springy device 27
contrasting the seat oscillations.
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Dessin représentatif