[0001] The present invention refers to a device for mutually locking/releasing either the
back or the seat or both, particularly for chairs.
[0002] Nowadays devices are known which are adapted to predetermine the achievement of a
desired inclination between the seat and the back of a chair or armchair.
[0003] Thus,
DE 4.318.516 A1 is known, in which a device is disclosed for modifying the reciprocal positioning
between two movable components of a seat, such device comprising a lock-bolt which
engages with a toothing which is jointly connected to the body of a chair in order
to lock it in several different positions.
[0004] The device can be said to be bistable, in that it allows two distinct stable positions
of the lock-bolt to be determined.
[0005] Movement of the lock-bolt is in fact actuated by a device that is accommodated in
a container, the lock-bolt being jointly connected to a bracket to which a pair of
pivots is fixed, in axially offset positions with respect to each other, a first spring
acting between the bracket and the container while a second spring, stronger than
the first, acts between the container and an enlarged head of the pivot.
[0006] The device is actuated by the user by imposing a rotation upon a lever or cam, which
pushes upon the head of the pivot. This rotation is impressed according to an axis
that is perpendicular to that of the pivot. The lever has a determined, but not inconsiderable,
length in order to allow the user to impose, following the effort brought to bear
to obtain its rotation, a sufficient axial thrust upon the head, and this constitutes
a drawback owing to the consequent spatial arrangement that is imposed by the various
components.
[0007] This known solution has many other drawbacks, in addition to the structural complexity
of the arrangement of, and the volume occupied by, the individual components, such
as the need to act anyway with a determined rotation force on the lever in order to
obtain movements to the desired extent; in addition the lever is not easy to activate,
since it has to transform a rotation force impressed on the lever into an axial thrust
for the pivot.
[0008] Lastly, sticking points can be identified in the mechanical interaction between the
lock-bolt and the toothed wheel.
[0009] Also known is the Italian Utility Model No.
225116 in the name of DONATI S.r.1., which refers to a rocking assembly for seats with a
device for locking in various different positions in which a device is shown that
interacts with the lever arm to lock it in different positions or release it, respectively
in order to permit or not permit the rocking of the rocking support, and with it the
seating elements, with respect to the box-shaped body.
[0010] The device comprises a command lever that is susceptible to rotation about one of
its axes, to which is associated, approximately radially, a rigid tension member with
one end connected to such lever, and a locking element which is connected to the other
end of the tension member.
[0011] The locking element rotates in its turn about a vertical axis and moves towards and
away from the lever arm following the rotation of the command lever.
[0012] Springs are provided which make the device substantially bistable, i.e. following
successive activations of the command lever the device is capable of ensuring two
corresponding stable positions.
[0013] The device has a number of drawbacks, however: first and foremost, it is composed
of many components, which are located in various positions in the seat and are interconnected
with each other, which make its manufacture and assembly expensive.
[0014] In addition, activation of the locking element is achieved by rotating the lever,
but this transmits motion by means of the interposition of the rigid tension member,
such member being able to disengage or deform following the forces impressed upon
it.
[0015] The articulation of the locking element also contributes to defining further drawbacks,
which are due both to the possible problems in activation owing to possible seizing
or limitations to the freedom to slide between elements, and also to the force that
is necessary to impress in order to defeat both the resistance of a spring and the
friction present between the lever arm and the locking element, such friction being
much greater because the user is seated during the manoeuvre and therefore the coupling
between the lever arm and the locking element is increased.
[0016] Also known is EPA 0902634 which discloses a device for adjusting the inclination
of the seat in chairs and armchairs in general, characterised in that it comprises
a lock-bolt which is part of the locking element and which is fixed to one of the
two parts of the seat support, a plurality of holes cut into the other part of the
seat support in positions that can be engaged by the lock-bolt and which correspond
to the different reciprocal inclinations between the two parts of such support, a
stem for axially commanding such lock-bolt, an axially bistable device for controlling
such stem, a pair of preloaded springs interposed between such stem and such bistable
device and a button to command such bistable device.
[0017] This solution also has many drawbacks: first and foremost, activation of the device
must take place by means of a button, which is usually placed on a grip which is located
below the chair, such button not being easy to activate.
[0018] In addition the lock-bolt is located far from the button, necessitating the presence
of the stem, accommodated in a provided sheath, for the interconnection between the
lock-bolt and the button for its activation.
[0019] Still further, the presence of the sheath may lead to the non-optimal activation
of the lock-bolt, since when the button is activated the stem might not slide optimally
inside the sheath, or equally it might lead to a deformation of the stem which frustrates
the thrust with respect to the lock-bolt. Also known is
WO 98/48670.
[0020] The aim of the present invention is to solve the above mentioned technical problems,
eliminating the drawbacks of the cited known art, by providing a device that makes
it possible to rapidly and simply achieve the mutual locking/releasing of the back
and the seat or only the seat or only the back of a chair, at the same time making
it possible to obtain an optimal transmission of the forces.
[0021] Within this aim, an object of the invention is to provide a device that is structurally
simple and compact, thus limiting the space occupied by it.
[0022] Another object of the invention is to provide a device which can be rapidly assembled
to a chair and easily maintained.
[0023] A further object is to provide a device that combines the foregoing characteristics
with low cost manufacture and which can be made with the usual known plants.
[0024] This aim and these objects, as well as others which will become better apparent hereinafter,
are achieved by a device for mutually locking/releasing either the back or seat or
both, particularly for chairs, comprising a box-like structure according to claim
1.
[0025] Further characteristics and advantages of the invention will become better apparent
from the following detailed description of a particular, but not exclusive, embodiment
thereof, illustrated by way of an indicative and non-limiting example in the accompanying
drawings, wherein:
Figure 1 is a perspective and exploded view of a device and a box-like structure according
to the invention;
Figures 2 and 3 are respectively a top view and a front view of the device;
Figure 4 is a sectional view taken along the line IV-IV of Figure 2 when the device
is in the released condition;
Figure 5 is a similar view to that of Figure 1 in which the supporting element has
been added and the position of the movable helical structure has been altered;
Figure 6 is a similar view to that of Figure 4 when the device is in the locked condition;
Figures 7, 8, 9, 10 and 11 are different views of the second movable helical structure;
Figure 12 is a partially sectional view of the lever;
Figure 13 is a partially sectional view of the device associated with the box-like
structure which is in turn associated with the support;
Figures 14, 15 and 16 are two different views of the first fixed helical structure.
[0026] In the embodiments that follow, individual characteristics shown in relation to specific
examples may in reality be interchanged with other, different characteristics, existing
in other embodiments.
[0027] In addition, it should be noted that anything found to be already known during the
patenting process is understood not to be claimed and to be the subject of a disclaimer.
[0028] With reference to the figures, the reference numeral 101 designates a device for
mutually locking/releasing the back and the seat or only the seat or only the back
(seat and back not shown), particularly for chairs, comprising a box-like structure
102, which can be associated with the seat and with a stem of a gas-assisted spring
(not shown), to which a supporting element 103 for the back is articulated in contrast
with an elastic element (not shown).
[0029] The device 101 is constituted by a lever 104 which is constituted by a handle 105
for the user, from which a substantially cylindrical and hollow box-like body 106
protrudes axially, elastically deformable appendages 108 being provided radially at
the end 107 of such body for temporary and rotary interconnection with a bush 109
that can be associated laterally with the box-like structure 102 at and coaxially
to an appropriately provided cylindrical flange 110, which is hollow internally and
which protrudes at right angles to the lateral surface 111 of the box-like structure
102, a first hole 128 being provided at such structure.
[0030] Inside the box-like body 106, on the side that lies opposite with respect to the
end 107 and axially contiguous to the handle 105, a sleeve 112 protrudes and acts
as a seat for a first elastically deformable element 113 which is arranged coaxially
to a pivot 114 and is interposed between the end of the sleeve 112 and a washer 115
which is fitted on the pivot 114 and which in turn abuts against a first annular ridge
116, which is radial with respect to the pivot 114.
[0031] A second elastically deformable element 117 is arranged coaxially to the remaining
part of the pivot 114, which is directed toward the bush 109.
[0032] Means adapted to actuate the axial movement of the pivot 114 upon a clockwise or
counterclockwise rotation imparted to the handle 105 of such lever by the user are
associated axially with such lever, such means being constituted by a first fixed
helical structure 118 and by a second movable helical structure 119.
[0033] The first fixed helical structure 118 is constituted by a cylindrical and hollow
element 118a which is arranged coaxially and internally to the cylindrical flange
110 and is slightly shorter than such flange.
[0034] The first helical structure 118 is fixed, i.e. the cylindrical element 118a is prevented
from performing any rotation.
[0035] The end 118b of the first fixed helical structure 118 that is directed away from
the box-like structure 102 has a particular shape, being constituted substantially
by two first pairs of surfaces 120a, 120b, 120c, 120d which are approximately V-shaped
and which are mutually mirror-symmetrical with respect to a plane that is diametrical
to the cylindrical element 118a and which protrude, at first vertices 121, toward
the handle 105.
[0036] The shape of such two first pairs of surfaces is helical.
[0037] A first seat 122 is provided at the end 118b of the first fixed helical structure
118, axially with respect to the cylindrical element 118a and along part of its length,
for a corresponding end of the second elastically deformable element 117 which is
thus interposed between the first ridge 116 and the bottom of the first seat 122.
[0038] The second movable helical structure 119 is constituted by a cylindrical and hollow
element 119a on the lateral surface of which there are, preferably along diametrical
axes, four second seats 123 for ridges 124 that protrude internally and axially with
respect to the box-like body 106 of the lever 104.
[0039] The interaction between the ridges 124 and the second seats 123 jointly and rotatably
connects the second movable helical structure 119 to the lever 104.
[0040] The inside diameter of the second movable helical structure 119 is such as to allow
it to be arranged coaxially and externally to the second elastically deformable element
117 and therefore also to the pivot 114, its end directed toward the sleeve 112 abutting
against the washer 115.
[0041] The end 118b of the second fixed helical structure 119 that is directed toward the
box-like structure 102 has a particular shape that is constituted substantially by
second pairs of surfaces 125a, 125b, 125c, 125d which are approximately V-shaped and
which are mutually mirror-symmetrical with respect to a plane that is diametrical
to the cylindrical element 119a and which protrude, at the second vertices 126, toward
the two first pairs of surfaces 120a, 120b, 120c, 120d, so as to interact with them
upon a rotation imparted to the handle 105.
[0042] The first and second pairs of surfaces are therefore helical, so that a rotation
imparted to the second moving helical structure 119 is matched by a retraction or
advancement thereof toward the handle 105 with consequent loading or unloading of
the first elastically deformable element 113.
[0043] At the second vertices 126, third seats 127 are provided for the first vertices 121
of the two first pairs of surfaces 120a, 120b, 120c, 120d, so as to allow a temporarily
stable condition between the first fixed helical structure 118 and the second movable
helical structure 119.
[0044] The operation of the device according to the invention is as follows.
[0045] In the condition where the seat and the back are mutually released, shown in Figure
4, the end 114a of the pivot 114 protrudes beyond the first hole 128 formed on the
lateral surface 111 of the box-like structure 102, such end however not engaging with
any of the second holes 129 formed on the opposite lateral surface 103a of the support
103.
[0046] In this condition the first elastically deformable element 113 is preloaded and tends
to push the pivot 114 toward the second holes 129.
[0047] Moreover, the condition is stable because of the interaction between the first and
second vertices of the first pairs of surfaces 120a, 120b, 120c, 120d and of the second
pairs of surfaces 125a, 125b, 125c, 125d.
[0048] If the user imparts a rotation to the lever 104, clockwise or anticlockwise, of ninety
degrees, then in the same way a rotation is imparted to the second movable helical
structure 119 which leads to the mutual decoupling of the first vertices and the second
vertices and the reciprocal sliding of the first pairs of surfaces 120a, 120b, 120c,
120d against the second pairs of surfaces 125a, 125b, 125c, 125d forced by the first
elastically deformable element 113.
[0049] Thus a second condition of equilibrium is achieved, shown in Figure 6, of mutually
locked positioning of the seat and the back because the end of the pivot 114 passes
through one of the various second holes 129.
[0050] In this condition the second elastically deformable element 117 is preloaded, which
will help achieve the release upon a subsequent rotation of such lever.
[0051] In practice it has been found that the invention fully achieves the intended aim
and objects, since a device is obtained that makes it possible to rapidly and simply
achieve the mutual locking/releasing of the back and the seat of a chair, thanks to
the low number of components it contains and their compaction in the body of the lever.
[0052] This shape of the device makes it possible to optimally transmit the forces directly
from the lever to the pivot, so achieving the mutual locking/releasing of the seat
and the back without effort.
[0053] The device therefore occupies a small space and is completely outside the box-like
structure, which makes its rapid assembly possible as well as its maintenance.
[0054] Naturally the materials used as well as the dimensions constituting the individual
components of the invention may be more relevant according to specific requirements.
[0055] The various different means for effecting certain different functions shall not in
any way coexist in the illustrated embodiment only, but may be present in and of themselves
in many embodiments, even if not illustrated.
[0056] The characteristics indicated as advantageous, advisable or similar, may also be
lacking or be substituted by equivalent characteristics.
[0057] The disclosures in Italian Patent Application No.
TV2009A000110 from which this application claims priority.
[0058] Where technical features mentioned in any claim are followed by reference signs,
those reference signs have been included for the sole purpose of increasing the intelligibility
of the claims and accordingly, such reference signs do not have any limiting effect
on the interpretation of each element identified by way of example by such reference
signs.
1. A device (101) for mutually locking/ releasing either the back or the seat or both,
particularly for chairs, comprising a box-like structure (102), which can be associated
with a seat and with a stem of a gas-assisted spring, to which a supporting element
(103) for a back is articulated in contrast with an elastic element, said device (101)
further comprising:
a pivot (114), which can move axially in contrast with a first elastically deformable
element (113) or a second elastically deformable element (117),
a lever (104) being provided which can be gripped by the user and which can be associated
rotatably with, and which protrudes laterally from, said box-like structure (102),
translation means (118, 119) being connected to said pivot (114) and being associated
axially with said lever (104), said translation means (118, 119) being adapted to
actuate the axial movement of said pivot (114) upon a clockwise or counterclockwise
rotation imparted to said lever (104);
locking means (128, 129) being associated to said box-like structure (102) and to
said supporting element (103), said locking means (128, 129) cooperating with said
translation means (118, 119) for positioning said pivot (114) in a first stable locking
position and in a second stable release position in order to lock said box-like structure
(102) to said supporting element (103) in predefined mutually locked positions.
2. The device according to claim 1, characterized in that said translation means (118, 119) comprises a first fixed helical structure (118)
and a second movable helical structure (119), said first fixed helical structure (118)
being fixed with respect said box-like structure (102) and said second movable helical
structure (119) being rotatably connected to said lever (104).
3. The device according to claim 1, characterized in that said lever (104) is constituted by a handle (105) for the user, from which a substantially
cylindrical and hollow box-like body (106) protrudes axially, elastically deformable
appendages (108) being provided radially at the end (107) of said body for temporary
and rotary interconnection with a bush (109) that can be associated laterally with
said box-like structure (102) at and coaxially to an appropriately provided cylindrical
flange (110), which is hollow internally and protrudes at right angles to the lateral
surface (111) of said box-like structure (102), a first hole (128) being provided
at said structure.
4. The device according to claim 3, characterized in that a sleeve (112) protrudes inside said box-like body (106), on the side that lies opposite
with respect to the end (107) and is axially contiguous to said handle (105), and
acts as a seat for said first elastically deformable element (113) arranged coaxially
to said pivot (114) and interposed between the end of said sleeve (112) and a washer
(115) that is fitted on said pivot (114) and in turn abuts against a first annular
ridge (116), which is radial with respect to said pivot (114), a second elastically
deformable element (117) being arranged coaxially to the remaining part of said pivot
(114), which is directed toward said bush (109).
5. The device according to claim 4, characterized in that said first fixed helical structure (118) is constituted by a cylindrical and hollow
element (118a), which is arranged coaxially and internally to said cylindrical flange
(110) and is slightly shorter than said flange, said first helical structure (118)
being fixed in that said cylindrical element (118a) is prevented from performing any rotation.
6. The device according to claim 5, characterized in that the end (118b) of
said first fixed helical structure (118) that is directed away from said box-like
structure (102) has a shape that is constituted substantially by two first pairs of
surfaces (120a, 120b, 120c, 120d), which are approximately V-shaped and are mutually
mirror-symmetrical with respect to a plane that is diametrical to said cylindrical
element (118a) and protrude, at the first vertices (121), toward said handle (105),
the shape of said two first pairs of surfaces (120a, 120b, 120c, 120d) being helical.
7. The device according to claim 6, characterized in that a first seat (122) is provided, at said end (118b) of said first fixed helical structure
(118), axially with respect to said cylindrical element (118a) and along part of its
length, for a corresponding end of said second elastically deformable element (117),
which is thus interposed between said first ridge (116) and the bottom of said first
seat (122).
8. The device according to claim 4, characterized in that said second movable helical structure (119) is constituted by a cylindrical and hollow
element (119a), on the lateral surface of which there are four second seats (123)
for ridges (124) that protrude internally and axially with respect to the box-like
body (106) of the lever (104), the interaction between said ridges (124) and said
second seats (123) jointly connecting said second movable helical structure (119)
to said lever (104) for rotation.
9. The device according to claim 4, characterized in that the inside diameter of said second movable helical structure (119) is such as to
allow to arrange it coaxially and externally to said second elastically deformable
element (117) and therefore also to said pivot (114), its end directed toward said
sleeve (112) abutting against said washer (115).
10. The device according to claim 9, characterized in that the end (118b) of said second movable helical structure (119) that is directed toward
said box-like structure (102) has a shape that is constituted substantially by second
pairs of surfaces (125a, 125b, 125c, 125d), which are approximately V-shaped and mutually
mirror-symmetrical relative to a plane that is diametrical with respect to said cylindrical
element (119a) and protrude, at second vertices (126), in the direction of said two
first pairs of surfaces (120a, 120b, 120c, 120d), so as to interact with them upon
a rotation imparted to said handle (105), said first and second pairs of surfaces
having a helical shape, so that a rotation imparted to said second movable helical
structure (119) is matched by a retraction or advancement thereof toward said handle
(105), with consequent loading or unloading of said first elastically deformable element
(113).
11. The device according to claim 10, characterized in that third seats (127) are provided at said second vertices (126) for the first vertices
(121) of said two first pairs of surfaces (120a, 120b, 120c, 120d), so as to allow
a temporarily stable condition between said first fixed helical structure (118) and
said second movable helical structure (119).
1. Vorrichtung (101) zum wechselweisen Sperren/Freigeben der Rückenlehne oder des Sitzes
oder beides, insbesondere für Stühle, umfassend einen kastenartigen Aufbau (102),
der an einen Sitz und einen Schaft einer Gasdruckfeder angegliedert werden kann, und
woran ein Halteelement (103) für eine Rückenlehne gegenüber einem elastischen Element
gelenkig angebracht ist, wobei die Vorrichtung (101) ferner umfaßt:
einen Drehzapfen (114), der sich axial gegen ein erstes elastisch verformbares Element
(113) oder ein zweites elastisch verformbares Element (117) bewegen kann,
einen bereitgestellten Hebel (104), der von dem Benutzer ergriffen werden kann und
der drehbar an den kastenartigen Aufbau (102) angegliedert werden kann und seitlich
davon vorspringt,
ein Verschiebemittel (118, 119), das mit dem Drehzapfen (114) verbunden ist und axial
an den Hebel (104) angegliedert ist, wobei das Verschiebemittel (118, 119) dazu geeignet
ist, bei einer auf den Hebel (104) ausgeübten Drehung im Uhrzeigersinn oder gegen
den Uhrzeigersinn die axiale Bewegung des Drehzapfens (114) zu bewirken,
ein Sperrmittel (128, 129), das an den kastenartigen Aufbau (102) und das Halteelement
(103) angegliedert ist, wobei das Sperrmittel (128, 129) mit dem Verschiebemittel
(118, 119) zusammenwirkt, um den Drehzapfen (114) an einer ersten stabilen Sperrposition
und an einer zweiten stabilen Freigabeposition zu positionieren, um den kastenartigen
Aufbau (102) an vordefinierten wechselseitig gesperrten Positionen an dem Halteelement
(103) zu sperren.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Verschiebemittel (118, 119) einen ersten festen schraubenförmigen Aufbau (118)
und einen zweiten beweglichen schraubenförmigen Aufbau (119) umfaßt, wobei der erste
feste schraubenförmige Aufbau (118) in Bezug auf den kastenartigen Aufbau (102) fixiert
ist und der zweite bewegliche schraubenförmige Aufbau (119) drehbar mit dem Hebel
(104) verbunden ist.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Hebel (104) durch einen Griff (105) für den Benutzer gebildet ist, wovon ein
im wesentlichen zylinderförmiger und hohler hülsenartiger Körper (106) axial vorspringt,
wobei elastisch verformbare Fortsätze (108) radial an dem Ende (107) des Körpers bereitgestellt
sind, um sich zeitweilig und drehend mit einer Buchse (109) zu verbinden, welche an
einem passend bereitgestellten zylinderförmigen Flansch (110), der innen hohl ist
und in einem rechten Winkel zu der Seitenfläche (111) des kastenartigen Aufbaus (102)
vorspringt, und koaxial damit seitlich an den kastenartigen Aufbau (102) angegliedert
werden kann, wobei in dem Aufbau eine erste Öffnung (128) bereitgestellt ist.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß eine Hülse (112) an jener Seite, die dem Ende (107) gegenüberliegt, in den hülsenartigen
Körper (106) vorspringt und axial an den Griff (105) anschließt und als Sitz für das
erste elastisch verformbare Element (113) wirkt, das koaxial mit dem Drehzapfen (114)
angeordnet ist und das eingefügt ist zwischen dem Ende der Hülse (112) und einer Scheibe
(115), die auf den Drehzapfen (114) aufgepaßt ist und die ihrerseits gegen einen ersten
ringförmigen Grat (116) anliegt, der in Bezug auf den Drehzapfen (114) radial angeordnet
ist, wobei ein zweites elastisch verformbares Element (117) koaxial mit dem restlichen
Teil des Drehzapfens (114), der zu der Buchse (109) gerichtet ist, angeordnet ist.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der erste feste schraubenförmige Aufbau (118) durch ein zylinderförmiges und hohles
Element (118a) gebildet ist, das koaxial und in dem Inneren des zylinderförmigen Flanschs
(110) angeordnet ist und etwas kürzer als der Flansch ist, wobei der erste schraubenförmige
Aufbau (118) fixiert ist, indem verhindert wird, daß das zylinderförmige Element (118a)
irgendeine Drehung durchführt.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das Ende (118b) des ersten festen schraubenförmigen Aufbaus (118), das von dem kastenartigen
Aufbau (102) weg gerichtet ist, eine Form aufweist, die im wesentlichen durch zwei
erste Paare von Flächen (120a, 120b, 120c, 120d) gebildet ist, welche ungefähr V-förmig
sind und in Bezug auf eine Ebene, die zu dem zylinderförmigen Element (118a) diametral
ist, wechselseitig spiegelsymmetrisch sind und an den ersten Scheitelpunkten (121)
zu dem Griff (105) hin vorspringen, wobei die Form der beiden ersten Paare von Flächen
(120a, 120b, 120c, 120d) schraubenförmig ist.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß an dem Ende (118b) des ersten festen schraubenförmigen Aufbaus (118) ein erster Sitz
(122) in Bezug auf das zylinderförmige Element (118a) axial und entlang eines Teils
seiner Länge für ein entsprechendes Ende des zweiten elastisch verformbaren Elements
(117) bereitgestellt ist, welches dadurch zwischen den ersten Grat (116) und den Boden des ersten Sitzes (122) eingefügt wird.
8. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der zweite bewegliche schraubenförmige Aufbau (119) durch ein zylinderförmiges und
hohles Element (119a) gebildet ist, an dessen seitlicher Fläche vier zweite Sitze
(123) für Grate (124), welche in Bezug auf den hülsenartigen Körper (106) des Hebels
(104) innen und axial vorspringen, eingerichtet sind, wobei die Wechselwirkung zwischen
den Graten (124) und den zweiten Sitzen (123) gemeinsam den zweiten beweglichen schraubenförmigen
Aufbau (119) zur Drehung mit dem Hebel (104) verbindet.
9. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Innendurchmesser des zweiten beweglichen schraubenförmigen Aufbaus (119) derart
ist, daß seine koaxiale und äußerliche Anordnung an dem zweiten elastisch verformbaren
Element (117) und daher auch an dem Drehzapfen (114) gestattet wird, wobei sein Ende,
das zu der Hülse (112) gerichtet ist, auf die Scheibe (115) trifft.
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß das Ende (118b) des zweiten beweglichen schraubenförmigen Aufbaus (119), das zu dem
kastenartigen Aufbau (102) gerichtet ist, eine Form aufweist, die im wesentlichen
durch zweite Paare von Flächen (125a, 125b, 125c, 125d) gebildet ist, welche ungefähr
V-förmig sind und in Bezug auf eine Ebene, die in Bezug auf das zylinderförmige Element
(119a) diametral ist, wechselseitig spiegelsymmetrisch sind und an zweiten Scheitelpunkten
(126) in die Richtung der beiden ersten Paare von Flächen (120a, 120b, 120c, 120d)
vorspringen, um bei einer auf den Griff (105) ausgeübten Drehung damit in Wechselwirkung
zu treten, wobei die ersten und zweiten Paare von Flächen eine schraubenförmige Form
aufweisen, so daß eine auf den zweiten beweglichen schraubenförmigen Aufbau (119)
ausgeübte Drehung mit seinem Zurückziehen oder Vorrücken zu dem Griff (105), mit einer
sich daraus ergebenden Belastung oder Entlastung des ersten elastisch verformbaren
Elements (113) einhergeht.
11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß an den zweiten Scheitelpunkten (126) dritte Sitze (127) für die ersten Scheitelpunkte
(121) der beiden ersten Paare von Flächen (120a, 120b, 120c, 120d) bereitgestellt
sind, um einen zeitweilig stabilen Zustand zwischen dem ersten festen schraubenförmigen
Aufbau (118) und dem zweiten beweglichen schraubenförmigen Aufbau (119) zu gestatten.
1. Dispositif (101) destiné à bloquer/libérer mutuellement soit le dossier soit le siège
ou tous les deux, en particulier pour chaises, comprenant une structure de type caisse
(102) qui peut être associée à un siège et à une tige d'un ressort à gaz et sur laquelle
un élément de support (103) pour un dossier est articulé par rapport à un élément
élastique, ledit dispositif (101) comprenant en outre :
un pivot (114) apte à se déplacer axialement à l'encontre d'un premier élément élastiquement
déformable (13) ou d'un deuxième élément élastiquement déformable (117),
un levier (104) prévu qui peut être saisi par l'utilisateur et qui peut être associé
à rotation à ladite structure de type caisse (102) et fait saillie latéralement de
celle-ci,
un moyen de translation (118, 119) qui est relié audit pivot (114) et associé axialement
audit levier (104), ledit moyen de translation (118, 119) étant apte à provoquer le
mouvement axial dudit pivot (114) lorsqu'une rotation dans le sens des aiguilles d'une
montre ou dans le sens inverse des aiguilles d'une montre est imprimée audit levier
(104),
un moyen de blocage (128, 129) qui est associé à ladite structure de type caisse (102)
et audit élément de support (103), ledit moyen de blocage (128, 129) agissant de concert
avec ledit moyen de translation (118, 119) afin de positionner ledit pivot (114) dans
une première position stable de blocage et dans une deuxième position stable de libération
de manière à bloquer ladite structure de type caisse (102) sur ledit élément de support
(103) dans des positions prédéfinies bloquées mutuellement.
2. Dispositif selon la revendication 1, caractérisé par le fait que ledit moyen de translation (118, 119) comprend une première structure hélicoïdale
fixe (118) et une deuxième structure hélicoïdale mobile (119), ladite première structure
hélicoïdale fixe (118) étant fixée par rapport à ladite structure de type caisse (102),
et ladite deuxième structure hélicoïdale mobile (119) étant reliée à rotation audit
levier (104).
3. Dispositif selon la revendication 1, caractérisé par le fait que ledit levier (104) est formé par une poignée (105) pour l'utilisateur d'où fait saillie
axialement un corps de type boîte (106) pour l'essentiel cylindrique et creux, des
appendices élastiquement déformables (108) étant prévus radialement à l'extrémité
(107) dudit corps pour une interconnexion temporaire et rotative avec une douille
(109) qui peut être associée latéralement à ladite structure de type caisse (102)
sur et coaxialement à un flasque cylindrique (110) prévu de manière appropriée qui
est creux à l'intérieur et fait saillie à angle droit par rapport à la surface latérale
(111) de ladite structure de type caisse (102), une première ouverture (128) étant
prévue dans ladite structure.
4. Dispositif selon la revendication 3, caractérisé par le fait qu'un manchon (112) fait saillie dans ledit corps de type boîte (106), sur le côté qui
est opposé à ladite extrémité (107), et est axialement contigu à ladite poignée (105)
et fait fonction de logement pour ledit premier élément élastiquement déformable (113)
qui est disposé coaxialement audit pivot (114) et est interposé entre l'extrémité
du manchon (112) et une rondelle (115) laquelle est ajustée sur ledit pivot (114)
et s'applique, de sa part, contre une première saillie annulaire (116) qui est radiale
par rapport audit pivot (114), un deuxième élément élastiquement déformable (117)
étant disposé coaxialement à la partie restante du pivot (114) qui est dirigée vers
ladite douille (109).
5. Dispositif selon la revendication 4, caractérisé par le fait que ladite première structure hélicoïdale fixe (118) est constituée par un élément cylindrique
et creux (118a) qui est disposé coaxialement au et à l'intérieur du flasque cylindrique
(110) et présente une longueur légèrement inférieure à celle du flasque, ladite première
structure hélicoïdale (118) étant fixée par le fait que ledit élément cylindrique (118a) est empêché de n'effectuer aucune rotation.
6. Dispositif selon la revendication 5, caractérisé par le fait que l'extrémité (118b) de la première structure hélicoïdale fixe (118), dirigée dans
la direction opposée à la structure de type caisse (102), présente une forme constituée
pour l'essentiel par deux premières paires de surfaces (120a, 120b, 120c, 120d) qui
présentent approximativement une forme de V et sont mutuellement à symétrie spéculaire
par rapport à un plan qui est diamétral audit élément cylindrique (118a), et se projettent,
sur les premiers sommets (121), vers ladite poignée (105), la forme des deux premières
paires de surfaces (120a, 120b, 120c, 120d) étant hélicoïdale.
7. Dispositif selon la revendication 6, caractérisé par le fait que, à ladite extrémité (118b) de la première structure hélicoïdale fixe (118), un premier
logement (122) est prévu axialement par rapport audit élément cylindrique (118a) et
suivant une partie de sa longueur, pour une extrémité correspondante du deuxième élément
élastiquement déformable (117) qui est interposé ainsi entre ladite première saillie
(116) et le fond dudit premier logement (122).
8. Dispositif selon la revendication 4, caractérisé par le fait que ladite deuxième structure hélicoïdale mobile (119) est constituée par un élément
cylindrique et creux (119a) sur la surface latérale duquel sont réalisés quatre deuxièmes
logements (123) pour des saillies (124) qui font saillie intérieurement et axialement
par rapport au corps de type boîte (106) dudit levier (104), l'interaction entre lesdites
saillies (124) et lesdits deuxièmes logements (123) reliant ensemble ladite deuxième
structure hélicoïdale mobile (119) au levier (104) pour une rotation.
9. Dispositif selon la revendication 4, caractérisé par le fait que le diamètre intérieur de ladite deuxième structure hélicoïdale mobile (119) est tel
qu'il permet de l'agencer coaxialement et extérieurement audit deuxième élément élastiquement
déformable (117) et ainsi également audit pivot (114), son extrémité dirigée vers
le manchon (112) venant buter contre ladite rondelle (115).
10. Dispositif selon la revendication 9, caractérisé par le fait que ladite extrémité (118b) de la deuxième structure hélicoïdale mobile (119), dirigée
en direction de la structure de type caisse (102), présente une forme constituée pour
l'essentiel par des deuxièmes paires de surfaces (125a, 125b, 125c, 125d) qui présentent
approximativement une forme de V et sont mutuellement à symétrie spéculaire par rapport
à un plan qui est diamétral par rapport audit élément cylindrique (119a), et se projettent,
sur des deuxièmes sommets (126), vers les deux premières paires de surfaces (120a,
120b, 120c, 120d) de manière à interagir avec elles lors d'une rotation imprimée à
ladite poignée (105), lesdites premières et deuxièmes paires de surfaces présentant
une forme hélicoïdale de sorte qu'une rotation imprimée à ladite deuxième structure
hélicoïdale mobile (119) va de concert avec une rétraction ou un avancement de celle-ci
vers la poignée (105), avec une contrainte ou une décharge dudit premier élément élastiquement
déformable (113), qui en résulte.
11. Dispositif selon la revendication 10, caractérisé par le fait que, sur lesdits deuxièmes sommets (126), des troisièmes logements (127) sont prévus
pour les premiers sommets (121) des deux premières paires de surfaces (120a, 120b,
120c, 120d) afin de permettre un état temporairement stable entre ladite première
structure hélicoïdale fixe (118) et ladite deuxième structure hélicoïdale mobile (119).