EP3972452B1 - Pivot fitting and piece of furniture - Google Patents

Description

The present invention relates to a swivel fitting, in particular for movable furniture parts on seating or reclining furniture according to the preamble of claim 1 and a piece of furniture.

A generic swivel fitting is, for example, from DE 10 2017 110 253 A1 known. With this swivel fitting, two levers can be fixed relative to one another via a clamping mechanism. One of these levers can be attached to a base body or seat part of upholstered furniture, while the second lever serves to fix a pivotably mounted headrest, armrest, footrest or another furniture part pivotably mounted on the base body or seat part of the furniture.

With the help of the pivoting fitting, the pivotable furniture part can be pivoted from an initial position into a predetermined pivoted position and fixed in this pivoted position.

The swivel fitting is designed in such a way that the furniture part to be adjusted can be adjusted from any swivel position without the two levers first having to be swiveled back into the basic position.

Such a swivel fitting has proven itself in practice.

The problem with such a swivel fitting is that the swivel fitting or a piece of furniture can be damaged if the swivel fitting is overloaded.

To avoid such damage, it is, for example, from the DE 10 2017 110 248 A1 known to mount an overload clutch between the two levers of the swivel fitting, which is arranged as a unit between the first lever and the second lever.

The disadvantage here is that such overload clutches are relatively expensive to manufacture. Another disadvantage is that the overload clutch has to be re-engaged at the point at which it disengaged, or at least can only be re-engaged in a shifted grid.

DE102017110253 A1 discloses a swivel fitting according to the preamble of claim 1.

The object of the present invention is to further develop a swivel fitting of the generic type such that the swivel fitting is also protected against overload in a simple and cost-effective manner.

A further object of the invention is to provide a piece of furniture with which the functioning of a piece of furniture with movable components is further improved.

The first object is achieved by a swivel fitting with the features of claim 1. The second object is achieved by a piece of furniture with the features of claim 12.

The swivel fitting according to the invention has at least one first lever, which is mounted around a force shaft serving as the axis of rotation and can be swiveled out of a basic position by a predetermined angle relative to the latter. The swivel fitting also has a clamping mechanism with which the first lever can be fixed in different angular positions within the predetermined angle relative to the power shaft.

This clamping mechanism has a toothed ring disk placed on the power shaft with external teeth formed on the outer edge and a pawl pivotally mounted on the first lever and loaded in the direction of the external teeth, which in a detent position engages with the external teeth of the toothed ring disk.

The clamping mechanism also has a first control disk, which is rotatably mounted around the power shaft and with which the at least one pawl can be disengaged from the toothing in an adjustment direction after the predetermined angle has been traversed from the basic position, so that when the pawl is disengaged from the toothing by crossing the predetermined angle in a return direction, the first lever can be pivoted back into the basic position relative to the power shaft.

At least one friction disk arranged on the power shaft in a rotationally fixed and axially secured manner is pushed onto the annular gear disk, the annular gear disk is held frictionally on the at least one friction disc up to a predetermined torque against rotation about the axis of rotation.

With a swivel fitting designed in this way, an overload safety device that is easy to assemble and inexpensive in terms of its components is made possible, with which the power shaft is decoupled from the toothed ring disk and thus the power shaft from the first lever in the event of an overload.

As a result, the first lever can be pivoted relative to the power shaft without damaging the clamping mechanism.

If the overload falls below again, the swivel fitting according to the invention is still fully functional.

Advantageous variants of the invention are the subject matter of the dependent claims.

According to an advantageous embodiment of the invention, an inner peripheral edge of the toothed ring disk is conically shaped and pushed onto a cone arranged on the power shaft.

Here, the at least one friction disc is pressed against the annular gear disc on the side of the smaller diameter of the inner peripheral edge of the annular gear disc.

The cone arranged on the power shaft and the friction disk press the friction disk arranged non-rotatably on the power shaft and the annular gear disk together in such a way that the predetermined torque defining the overload limit must be exceeded for the relative rotation of the friction disk to the annular gear disk.

The resilient pressure force of the friction disk creates friction on the cone and on the contact surface of the toothed ring disk.

The predetermined torque can be defined depending on the selected pressure force or coefficient of friction between the contact surface of the toothed ring disk on the friction disk and the predefined cone angle.

According to an advantageous development of the invention, the cone is formed in one piece on the power shaft, which enables extremely simple assembly.

According to an alternative embodiment, the cone is mounted on the power shaft.

As a result, the power shaft itself and the cone to be produced as an individual component, for example as a sheet metal element, can be produced very inexpensively.

According to an advantageous development, the cone is designed as a radially slotted clamping ring.

According to an advantageous embodiment variant, the cone angle of the cone is between 15° and 35°, particularly preferably between 20° and 30°.

According to an alternative embodiment variant, a friction disk arranged in a rotationally fixed and axially secured manner is pushed on on both sides of the toothed ring disk.

Accordingly, no cone is required on the power shaft in this variant.

According to an alternative embodiment variant, a plurality of toothed ring disks are placed on the power shaft, with a friction disk held non-rotatably on the power shaft being arranged between two toothed ring disks.

Preference is given to using three toothed ring disks and two friction disks arranged between them.

In an alternative design variant, two toothed ring disks are used with a friction disk arranged between them.

The force exerted by the friction disks which are fixed and/or pressed onto the power shaft in a rotationally fixed manner thus creates friction at six contact points (in the case of three toothed ring disks) or four contact points (in the case of two toothed ring disks used), via which the torque provided for the overload protection can be adjusted .

The wear and the overload torque can be set in a simple manner via the spring force and pressing depth of the friction discs used and the number of toothed ring discs used.

According to a further advantageous embodiment, a tab is formed on the first control disk, which extends perpendicularly to the plane of the first control disk axially to the power shaft outwards into a recess provided for this purpose in a recess of the first lever.

According to yet another embodiment variant, a recess is formed on an outer edge of the friction disk, in which a switching element is accommodated so that it can pivot about a switching angle in the plane of the friction disk.

This switching element also serves as an alternative to the combination of the control pin arranged on the first lever and the recess in the first control disk.

The friction disk accommodating the switching element has a thickness, in the axial direction of the power shaft, which is greater than the thickness of the switching element.

This has the effect, in a simple manner, that the forces applied by the friction discs cannot cause this switchover element to become jammed.

According to a preferred embodiment variant, the at least one friction disk is pressed onto the power shaft with a press fit against the annular gear disk.

This makes it possible to generate sufficient friction between the friction disk and the annular gear disk solely by means of the friction disk.

According to a further advantageous embodiment variant, the friction disk is designed as a plate spring.

According to a further preferred embodiment variant, a switching contour is formed on an outer edge of the friction disk.

According to a further advantageous development, the predetermined torque up to which the toothed ring disk is frictionally held against rotation about the axis by the at least one friction disk is at least 70 Nm, preferably at least 80 Nm.

This ensures that the clamping mechanism does not react to lower torques when the load is low and there is no risk of damage to the swivel fitting, so that the levers remain in their position and can only be adjusted relative to one another once the predetermined torque has been reached, without the actual function of the clamping mechanism being disabled to use.

A particular advantage of the arrangement according to the invention is that the swivel fitting enables a maximum adjustment angle of approximately 250°. This is made possible by the arrangement of the control bolts and the stops as well as the internal structure with the toothed ring disc, the control disc and the pawl.

According to one embodiment variant, a second lever is coupled to the power shaft in a rotationally fixed manner.

The furniture according to the invention is characterized by a swivel fitting as described above.

According to an embodiment variant, the second lever is part of the adjustable furniture part.

Figur 1

eine Draufsicht auf eine Ausführungsvariante eines erfindungsgemäßen Schwenkbeschlages,

Figur 2

eine perspektivische Explosionsdarstellung des Schwenkbeschlages ohne Darstellung des zweiten Hebels,

Figur 3

eine perspektivische Einzeldarstellung der Zahnringscheibe, der Kraftwelle, der Reibscheibe, des Konus und der ersten Steuerscheibe,

Figur 4

eine Teilschnittansicht der Kraftwelle mit an dieser angeordneten Überlastbauteile,

Figur 5

eine Explosionsdarstellung einer Ausführungsvariante der Zahnringscheibe, des Konus und der Kraftwelle,

Figur 6

eine perspektivische Darstellung der in Figur 5 gezeigten Bauteile im zusammengesetzten Zustand,

Figur 7

eine perspektivische Darstellung einer alternativen Ausführungsvariante einer Reibscheibe, montiert auf der Kraftwelle,

Figur 8

eine Draufsicht auf den Schwenkbeschlag mit Darstellung eines Anschlags,

Figur 9

eine der Figur 8 entsprechende Darstellung des Schwenkbeschlags in einer anderen Schwenkstellung,

Figur 10

eine Schnittansicht des Schwenkbeschlags,

Figuren 11 und 12

Draufsichten auf den Schwenkbeschlag mit alternativ ausgeführten Anschlägen am zweiten Hebel,

Figur 13

eine Seitenansicht einer alternativen Ausführungsgestaltung des Überlastschutzes,

Figuren 14 bis 19

Draufsichten auf den Schwenkbeschlag mit weggelassenem Hebelkopf zur Darstellung des Funktionsablaufes einer Schwenk- und Umschaltbewegung,

Figur 20

eine perspektivische Explosionsdarstellung einer alternativen Ausführungsvariante eines Klemmmechanismus mit Überlastschutz mit drei Zahnringscheiben und dazwischen angeordneten Reibscheiben,

Figur 21

eine Seitenansicht der in Figur 20 dargestellten Ausführungsgestaltung,

Figur 22

eine perspektivische Explosionsdarstellung einer weiteren alternativen Ausführungsvariante eines Klemmmechanismus mit Überlastschutz mit zwei Zahnringscheiben und dazwischen angeordneten Reibscheiben,

Figur 23

eine Seitenansicht der in Figur 22 dargestellten Ausführungsgestaltung,

Figur 24

eine perspektivische Explosionsdarstellung einer weiteren alternativen Ausführungsvariante eines Klemmmechanismus mit Überlastschutz mit drei Zahnringscheiben und dazwischen angeordneten Reibscheiben und einem alternativen Umschaltelement,

Figur 25

eine Seitenansicht der in Figur 24 dargestellten Ausführungsgestaltung,

Figur 26

eine schematische Draufsicht der in Figur 24 dargestellten Ausführungsgestaltung zur Darstellung der Anordnung des Umschaltelements, und

Figuren 27 und 28

schematische Darstellungen eines Möbels mit daran angeordnetem verschwenkbaren Möbelteil.

Preferred exemplary embodiments are explained in more detail below with reference to the accompanying drawings. Show it:

figure 1

a plan view of an embodiment of a swivel fitting according to the invention,

figure 2

a perspective exploded view of the swivel fitting without showing the second lever,

figure 3

a perspective individual view of the toothed ring disk, the power shaft, the friction disk, the cone and the first control disk,

figure 4

a partial sectional view of the power shaft with overload components arranged on it,

figure 5

an exploded view of an embodiment variant of the toothed ring disk, the cone and the power shaft,

figure 6

a perspective view of the figure 5 components shown in the assembled state,

figure 7

a perspective view of an alternative embodiment of a friction disc mounted on the power shaft,

figure 8

a plan view of the swivel fitting showing a stop,

figure 9

one of the figure 8 Corresponding representation of the swivel fitting in a different swivel position,

figure 10

a sectional view of the swivel fitting,

Figures 11 and 12

Top views of the swivel fitting with alternatively designed stops on the second lever,

figure 13

a side view of an alternative embodiment of the overload protection,

Figures 14 to 19

Top views of the swivel fitting with the lever head omitted to show the functional sequence of a swivel and switchover movement,

figure 20

a perspective exploded view of an alternative embodiment of a clamping mechanism with overload protection with three toothed ring discs and friction discs arranged in between,

figure 21

a side view of the in figure 20 illustrated design,

figure 22

a perspective exploded view of a further alternative embodiment of a clamping mechanism with overload protection with two toothed ring disks and friction disks arranged in between,

figure 23

a side view of the in figure 22 illustrated design,

figure 24

a perspective exploded view of a further alternative embodiment of a clamping mechanism with overload protection with three toothed ring disks and friction disks arranged in between and an alternative switching element,

figure 25

a side view of the in figure 24 illustrated design,

figure 26

a schematic plan view of in figure 24 shown embodiment to show the arrangement of the switching element, and

Figures 27 and 28

Schematic representations of a piece of furniture with a pivotable furniture part arranged thereon.

In the following description of the figures, terms such as top, bottom, left, right, front, rear, etc. refer exclusively to the exemplary representation and position of the swivel fitting, lever, toothed ring disk, pawl, power shaft, cone, selected in the respective figures. the friction disk and the like. These terms are not to be understood as limiting, i.e. these references can change due to different working positions or the mirror-symmetrical design or the like.

In figure 1 is denoted by the reference numeral 1 as a whole an embodiment of a swivel fitting according to the invention.

Such a swivel fitting 1 is used in particular to enable a swiveling movement of movable furniture parts on furniture, such as an armrest 103 or a backrest 102, headrest or footrest of a piece of furniture 100 designed as seating or lying furniture, as is exemplified in figures 27 and 28 is shown.

As in figure 1 is shown, the swivel fitting 1 has a first lever 2 and a second lever 3 in the embodiment variant shown here. The two levers 2, 3 are mounted pivotably relative to one another about a pivot axis D from a basic position by a predetermined angle in an adjustment direction V and a return direction R.

A clamping mechanism of the swivel fitting 1 arranged between two lever heads 23a and 23b of the first lever 2 is designed in such a way that the two levers 2, 3 can be fixed in different angular positions within the predetermined angle relative to one another against a torque acting in the return direction R and with the clamping mechanism deactivated are pivotable in the return direction R.

As a result, for example, the adjustment of the armrest 103 of the furniture 100, in which the armrest 103 is connected to the second lever 3, while the first lever 2 is connected to the body 101 of the furniture, so as to adjust the armrest 103 in a comfortable for the user To pivot position and to lock in the desired position.

As in the figures 2 and 3 is shown, the clamping mechanism has a power shaft 6 coupled to the second lever 3 in a rotationally fixed manner.

A toothed ring disk 4 with external teeth 41 formed on the outer edge is placed on this power shaft 6 .

It is also conceivable to design the swivel fitting 1 without a second lever 3 .

The clamping mechanism acts between the lever 2 and the power shaft 6 and thus enables an angular adjustment between the lever 2 and the power shaft 6.

If the swivel fitting 1 has a second lever 3 placed on the power shaft 6, the clamping mechanism also enables an angular adjustment between the first lever 2 and the second lever 3.

It is expressly pointed out that the second lever 3 can also be part of a piece of furniture which is placed directly on the power shaft 6 .

The shape of the lever 3 can therefore deviate significantly from the flat and elongated shape shown in the figures; for example, the use of tubes, in particular rectangular or square tubes, is also conceivable.

Furthermore, a pawl 5 loaded by a spring element 10 in the direction of this external toothing 41 of the toothed ring disk 4 is pivotably mounted on the first lever 2 . The pawl 5 is in a latching position in engagement with this external toothing 41.

The clamping mechanism also has a first control disk 7 which is rotatably mounted about the common axis D and with which the pawl 5 can be disengaged from the external toothing 41 of the annular gear disk 4 in an adjustment direction V after the predetermined angle has been traversed from the basic position.

In this disengaged position, the second lever 3 can be pivoted back into the basic position relative to the first lever 2 by crossing the predetermined angle in a return direction R.

As in the Figures 2 to 4 is also shown, at least one friction disk 8 arranged in a rotationally fixed and axially secured manner on the power shaft 6 is pushed onto the annular gear disk 4 .

Up to a predetermined torque M, the toothed ring disk 4 is held by friction against rotation about the axis D on the at least one friction disk 8 .

The frictional mounting of the toothed ring disk 4 relative to the power shaft 6 up to a predetermined torque M thus represents a cost-effective overload safety device for such a swivel fitting 1 that is less strong than an overload safety device designed as a separate structural unit.

As in the Figures 3 to 5 shown, according to a preferred embodiment, an inner peripheral edge 42 of the toothed ring disk 4 is conically shaped and pushed onto a cone 9 arranged on the power shaft 6 . In this case, one friction disk 8 presses against the toothed ring disk 4 on the side of the smaller diameter of the inner peripheral edge 42 of the toothed ring disk 4 .

In one embodiment, the cone 9 can be formed directly on the power shaft 6 .

According to an alternative preferred embodiment, the cone 9 is mounted on the power shaft 6 .

In particular, the cone 9 is designed as a radially slotted clamping ring, as shown in figure 5 is shown. The cone 9 shown there has an internally toothed inner diameter 92 for non-rotatable attachment to the power shaft 6, which is provided with external teeth 61.

The outer peripheral edge 91 of the cone 9 is conically shaped.

For easier application of the cone 9 to the power shaft 6, the figure 5 shown cone 9 is formed with a slot 93. When the friction disc 8 is pressed onto the cone 9, the internal toothing of the cone 9 is pressed onto the external toothing of the power shaft 6, so that the cone 9 is fixed axially on the power shaft 6 in a clamping manner.

The cone angle of the outer peripheral edge 91 of the cone 9 is preferably between 15° and 35°. The cone angle is particularly preferably between 20° and 30°.

The friction disk 8 is preferably pressed onto the power shaft 6 with a press fit against the annular gear disk 4 .

Alternatively, other axial fixations of the friction disk 8 are also conceivable, for example by applying a weld seam, a nut or the like.

As an alternative to the storage of the toothed ring disc 4 via one in the Figures 3 to 5 Cone 9 shown, it is also conceivable to push such a friction disk 8 onto the power shaft 6 on both sides of the toothed ring disk 4 .

This also enables a sufficiently high level of friction between the friction disks 8 and the annular gear disk 4 to ensure the function of an overload protection.

As in figure 3 is also shown, the at least one friction disc 8 is preferably designed as a plate spring.

The predetermined torque M up to which the toothed ring disk 4 is frictionally held against rotation about the axis D by the at least one friction disk 8 is preferably at least 70 Nm, particularly preferably at least 80 Nm.

As in figure 3 is also shown, the first control disk 7 is placed on the power shaft 6 on the side of the annular gear disk 4 facing away from the friction disk 8 .

The first control disc 7 can be pivoted relative to the power shaft 6 and is secured axially by a spring element 13 in the manner of a disk spring.

The spring element 13 is secured against rotation by teeth 132 on an inner circumference 131 of the spring element 13 on the power shaft 6 .

As in figure 2 is shown, the second control disk 11 is arranged on the side of the friction disk 8 facing away from the toothed ring disk 4 on the power shaft 6 . The second control disc 11 has a switching arm 111 and a slot 112 . A single tooth 113 meshes with the outer teeth of the power shaft 6 .

It is also conceivable to form a shifting contour 82 on the friction disk 8 instead of the second control disk 11, which contour extends radially outwards from the peripheral edge of the friction disk 8 over a predetermined angle, as shown in FIG figure 7 is shown.

The pawl 5 has a plurality of teeth 52 at a first end of a pawl arm 51 which, in use, engage the external toothing 41 of the toothed washer 4 .

At the opposite end of the latch arm 51, pivot bolts 53 protrude on both sides, with which the latch is pivotably fixed to pivot bolt receptacles 27 of the lever heads 23 of the first cover 2a and the second cover 2b.

On the side of the pawl arm 51 facing the external toothing 41 of the toothed ring disk 4 in the installed position, a recess 54 for receiving the switching contour 71 of the first control disk 7 is formed between the toothing 52 and the pivot pin 53 .

To limit the pivoting angle between the two levers 2, 3, control bolts 12 are fixed or formed on the covers 2a, 2b of the first lever 2 figures 8 and 9 The embodiment variants shown hit the stop edges of a disk-shaped stop 15 in the respective end positions, the disk-shaped stop 15 being non-rotatably connected to the second lever 3 or the power shaft 6 .

In an alternative embodiment, these attacks are formed by lateral stops 34 on the second lever 3, as in the figures 11 and 12 is shown.

The function of the swivel fitting 1 in normal operation is based on the below Figures 14 to 19 described.

In figure 14 shows an example of a position of the swivel fitting 1 that has already been swiveled a little way in the adjustment direction V, in which the pawl 5 engages in the external toothing 41 of the toothed ring disk 4 .

figure 15 shows a further pivoted position of the pivot fitting 1 in the adjustment direction V.

The pawl 5 is always pressed here by the spring element 10 designed as a spring plate against the external toothing 41 of the toothed ring disk 4 . The alignment of the outer teeth 41 of the annular gear 4 and the teeth 52 of the pawl 5 is such that in the adjustment direction V the pawl 5 of Tooth to tooth of the external teeth 41 of the annular gear 4 can be moved.

At the in figure 16 position shown, the switching arm 111 of the second control disc 11 has reached the outermost tooth of the toothing of the pawl 5 .

The outermost tooth 52 is designed with a run-on bevel 55 . As a result, with further rotation of the power shaft 6 and thus of the second lever 3 in the adjustment direction V, the switching arm 111 can be pushed onto the outer teeth 52 of the pawl 5, as a result of which the teeth 52 of the pawl 5 disengage from the outer teeth 41 of the toothed ring disk 4, such as it in figure 17 is shown.

As in figure 17 is also shown by dashed lines, in this position the switching contour 71 of the first control disk 7 lies in the recess 54 of the pawl 5 .

Furthermore, the control bolt 12 rests in the recess 72 of the first control disk 7 on the right-hand edge of this recess 72 .

If the second lever 3 or the power shaft 6 is now moved in the opposite direction, i.e. in the return direction R, this causes the second control disk 11 to move in the elongated hole 112 in the slot 112 in the The center of the second control disc 11 is pivoted about the switching arm 111 currently fixed on the teeth 52 of the pawl 5 .

At the same time, when the power shaft 6 rotates in the return direction, the control pin 12 reaches the left edge of the recess 72 in the first control disk 7.

During the subsequent further rotation of the power shaft 6 in the return direction R, the switchover contour 71 of the first control disk 7 is pushed onto a tooth-free plane of the arm 51 of the pawl 5, so that the teeth 52 of the pawl 5 are still disengaged from the external toothing 41 of the toothed ring disks 4 remain and the swivel fitting 1 can be swiveled back into the starting position.

In the event of an overload acting on the swivel fitting 1, the function of the overload protection is such that in any swiveling position of the levers 2, 3 of the swivel fitting 1 relative to one another from a torque M caused by the friction between the friction disc 8 and the toothed ring disc 4, the toothed ring disc 4 relative to the Friction disc 8 begins to slip about the axis of rotation D and the two levers 2, 3 can thus be pivoted relative to one another as long as the force exerted on the lever is greater than the predetermined torque M.

If the force exerted on the lever decreases and falls below the predetermined torque M, the frictional adhesion between the friction disk 8 and the toothed ring disk 4 resumes, so that the normal function of the swivel fitting 1 resumes.

At the in the Figures 20 to 26 In the alternative embodiment variants of a swivel fitting according to the invention that are shown, the clamping mechanism has a plurality of toothed ring discs 202 , 302 arranged side by side on the power shaft 6 instead of the one toothed ring disc 4 .

A friction disk 203 , 303 , 304 held non-rotatably on the power shaft 6 is arranged between two such toothed ring disks 202 , 302 .

At the in the figures 20 and 21 shown embodiment, three such toothed ring disks 202 are provided.

Each of these toothed washers 202, 302 has an annular inner peripheral edge 221, 321 and an outer toothing 222, 322, in which the pawl 5 engages.

Both at the in the figures 20 and 21 as well as the one in the Figures 22 and 23 and 24 to 26, the friction disks 8 rest against the outer surfaces of the outer toothed ring disks 202, 302, pressing against the toothed ring disks 202, 302 in the axial direction.

Analogous to in figure 13 In the embodiment variant shown, a first control disk 201, 301 is pushed onto the power shaft 6 on an outside of one of the friction disks 8.

This first control disk 201, 301 also has an inner peripheral edge 211 in the form of a circular ring.

Extending from an outer peripheral edge identical to the in figure 3 The embodiment variant shown has a switchover contour 212, which has the same purpose as the switchover contour 71 of the first control disk 7 according to FIG figure 3 shown embodiment is used.

On the opposite peripheral edge of the first control disk 201, in contrast to the figure 3 A tab 213 is formed in the embodiment variant shown, which extends perpendicular to the plane of the control disk 201 in the direction of the plate-spring-like spring element 13 on the side of the first control disk 201 facing away from the toothed ring disks 202 .

When installed, this tab 213 protrudes into a recess provided for this purpose on the first lever 2, which in this case has a slot-shaped recess instead of the control bolt 12, in which the tab 213 can be pivoted by a switching angle in the circumferential direction of the first control disk 201.

The friction disks 203 arranged between the toothed ring disks 202 have analogous to in figure 7 Friction disk 8 shown has a switching contour 232 which extends radially outwards from the outer circumference of the friction disks 203 .

The friction disks 203 also have an inner peripheral edge with internal teeth 231 analogously to the friction disks 8 .

In contrast to the one in the figures 20 and 21 shown embodiment variant, in which three toothed ring disks 202 are provided with two friction disks 203 arranged in between, are in the in figure 22 and 23 Two toothed ring disks 202 are provided with a friction disk 203 in between. Otherwise, the structure of the clamping mechanism of these two variants is identical.

The in the Figures 24 to 26 shown embodiment variant of a once again alternative clamping mechanism has analogous to that in the figures 20 and 21 The embodiment variant shown preferably has three toothed ring discs 302, each with one friction disc 303, 304 arranged between two of the toothed ring discs 302.

In contrast to the based on the Figures 20 to 23 In this embodiment variant, one of the friction disks 304 described above has an elevation 343 on its outer circumference 342, which is adjoined by a recess 344 for receiving a switching element 305.

The switching element 305 is adapted to the inner contour of the recess 344 in such a way that it can be pivoted by a predetermined switching angle within the recess 344 about a pivot axis which is coaxial with the pivot axis of the power shaft 6 but is radially offset outside of the power shaft 6, such as it well in figure 26 can be seen.

The recess 344 has an essentially v-shaped receiving area for receiving a v-shaped section of the switching element 305 .

The circumferential width of a neck of the switching element 305 is dimensioned such that it can be pivoted within the recess 344 by a predetermined switching angle.

The switching angle is preferably between 8° and 12°. The thickness of this switching element 305, viewed in the longitudinal direction of the power shaft 6, is less than the thickness of the friction disk 304.

In the variant shown here, friction disk 304 is larger than the thickness of friction disk 303.

The slightly smaller thickness of the switching element 305 compared to the friction disk 304 makes it possible in a simple manner to prevent the switching element 305 from being jammed by the friction disks 8 pressing against the annular gear disks 302 from the outside.

Reference List

1

swivel fitting

2

first lever

2a

first cover

2 B

second lid

21

lever arm

22

bending range

23a

lever head

23b

lever head

24

drilling

25

recording

26

drilling

27

Pivot bolt mount

3

second lever

31

lever arm

32

lever head

33

drilling

34

attack

4

gear washer

41

external teeth

42

inner peripheral edge

5

pawl

51

latch arm

52

teeth

53

pivot pin

54

recess

55

leading edge

6

force wave

61

external teeth

62

groove

7

first control disk

71

switch contour

72

recess

8th

friction disc

81

internal teeth

82

switching contour

9

cone

91

outer perimeter edge

92

internal teeth

93

slot

10

spring element

101

spring sheet metal strips

102

Tooth

11

second control disk

111

shift arm

112

Long hole

113

Tooth

12

control pin

13

spring element

131

inner circumference

132

Tooth

14

disc

15

attack

151

stop edge

100

furniture

161

furniture body

162

backrest

163

armrest

201

first control disk

211

inner diameter

212

switch contour

213

tab

202

gear washer

221

inner peripheral edge

222

external teeth

203

friction disc

231

internal teeth

232

switching contour

301

first control disk

311

inner diameter

312

switch contour

313

angled area

314

recess

302

gear washer

321

inner peripheral edge

322

external teeth

303

friction disc

331

internal teeth

304

friction disc

341

internal teeth

342

outer perimeter

343

elevation

344

recess

305

switching element

D

axis of rotation

V

adjustment direction

R

return direction

a

maximum adjustment angle

M

torque

dr

Thickness of the friction disc

you

Thickness of the switching element

Claims (18)

1. Pivot fitting (1), in particular for movable furniture parts on seating or reclining furniture, comprising

   - at least one first lever (2), which is mounted about a force-transmitting shaft (6) serving as an axis of rotation (D) so as to be pivotable from an initial position about a predetermined angle relative thereto,

   - a clamping mechanism with which the first lever (2) can be fixed in different angular positions within the predetermined angle relative to the force-transmitting shaft (6),

   - wherein the clamping mechanism comprises:

   a. a toothed-ring disc (4, 202, 302) fitted onto the force-transmitting shaft (6) and having outer toothing structure (41, 222, 322) integrally formed on the outer edge,

   b. a catch (5) which is pivotably mounted on the first lever (2) and loaded in the direction of the outer toothing structure (41, 222, 322), the catch (5) being in engagement with the outer toothing structure (41, 222, 322) in a latching position,

   c. a first control disc (7, 201, 301) which is mounted rotatably about the force-transmitting shaft (6) and by means of which the catch (5) can be brought out of engagement with the outer toothing structure (41, 222, 322) in an adjustment direction (V) after the predetermined angle has been passed over from the initial position so that, when the catch (5) has been brought out of engagement with the outer toothing structure (41, 222, 322), the first lever (2) can be pivoted back into the initial position relative to the force-transmitting shaft (6) by passing over the predetermined angle (α) in a return direction (R),

   characterized in that

   - at least one friction disc (8, 203, 303, 304) which is arranged on the force-transmitting shaft (6) in a rotationally fixed and axially secured manner is pushed onto the toothed-ring disc (4, 202, 302), wherein the toothed-ring disc (4, 202, 302) is held in a frictionally locking manner on the at least one friction disc (8, 203, 303, 304) up to a predetermined torque (M) against rotation about the axis of rotation (D).
2. Pivot fitting according to claim 1, characterized in that an inner circumferential edge (42) of the toothed-ring disc (4) is pushed in a conically shaped manner onto a cone (9) arranged on the force-transmitting shaft (6), wherein the at least one friction disc (8) pressingly abuts against the toothed-ring disc (4) on the side of the smaller diameter of the inner circumferential edge (42) of the toothed-ring disc (4).
3. Pivot fitting according to claim 2, characterized in that the cone (9) is integrally formed on the force-transmitting shaft (6).
4. Pivot fitting according to claim 2, characterized in that the cone (9) is mounted on the force-transmitting shaft (6).
5. Pivot fitting according to claim 4, characterized in that the cone (9) is designed as a radially slotted clamping ring.
6. Pivot fitting according to one of the preceding claims 2 to 5, characterized in that the cone angle of the cone (9) is between 15° and 35°.
7. Pivot fitting according to claim 1, characterized in that a friction disc (8, 203, 303, 304), which is arranged in a rotationally fixed and axially secured manner, is pushed onto both sides of the toothed-ring disc (4, 202, 302).
8. Pivot fitting according to claim 1 or 7, characterized in that a plurality of toothed-ring discs (202, 302) are fitted onto the force-transmitting shaft (6), wherein a friction disc (203, 303, 304) held in a rotationally fixed manner on the force-transmitting shaft (6) is arranged between two toothed-ring discs (202, 302).
9. Pivot fitting according to one of the preceding claims, characterized in that the at least one friction disc (8) is pressed onto the force-transmitting shaft (6) against the toothed-ring disc (4) with interference fit.
10. Pivot fitting according to one of the preceding claims, characterized in that the at least one friction disc (8) is designed as a disc spring.
11. Pivot fitting according to one of the preceding claims, characterized in that a changeover contour (82) is formed on an outer edge of the friction disc (8, 203).
12. Pivot fitting according to one of the preceding claims 1 to 10, characterized in that a recess (344) is integrally formed on an outer edge of the friction disc (304), in which recess (344) a changeover element (305) is pivotably accommodated about a changeover angle in the plane of the friction disc (304).
13. Pivot fitting according to claim 12, characterized in that the thickness d_R of the friction disc (304), measured in the longitudinal direction of the force-transmitting shaft (6), is greater than the thickness du of the changeover element (305).
14. Pivot fitting according to one of the preceding claims, characterized in that the predetermined torque (M) up to which the toothed-ring disc (4) is frictionally held against rotation about the axis (D) by the at least one friction disc (8) is at least 70 Nm, preferably at least 80 Nm.
15. Pivot fitting according to one of the preceding claims, characterized in that a second lever (3) is coupled in a rotationally fixed manner to the force-transmitting shaft (6).
16. Piece of furniture (100), comprising a pivot fitting (1) according to one of the preceding claims.
17. Piece of furniture (100) according to claim 16, characterized in that the pivot fitting (1) adjustably fixes an armrest (163) or other adjustable furniture parts to a furniture body (161) of a piece of furniture (100) designed as a piece of seating or reclining furniture.
18. Piece of furniture (100) according to claim 16 or 17, characterized in that the second lever (3) is part of the adjustable furniture part.

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