Swivel joint for adjusting a functional part with a clamping element

Description

[0001] The invention relates to a pivot joint for adjusting a functional part, in particular a headboard, a footboard or an armrest, of a piece of furniture, in particular a piece of seating furniture and / or a piece of reclining furniture, with a mounting lever for mounting the pivot joint on the furniture and a pivot lever for supporting and adjusting the functional part, wherein the mounting lever and the pivot lever are pivotally connected to one another from an initial position to an end position about a pivot axis in an adjustment direction.

[0002] Swivel joints for adjusting a functional part of a piece of furniture are known in various designs, e.g. from EP2526828A1. The swivel joints are usually used to adjust a headboard, a footboard or an armrest of a piece of seating furniture, which is typically upholstered furniture. The swivel joints have a mounting lever with which the swivel joints are attached to the respective piece of furniture. In addition, a swivel lever is provided which carries the respective functional part and swivels the respective functional part about the mounting lever. For this purpose, the mounting lever and the swivel lever are designed to be pivotable relative to one another about a joint pivot axis in an adjustment direction from an initial position to an end position.

[0003] When adjusting the pivot lever relative to the assembly lever in the adjustment direction, the user adjusts the pivot joint or pivots the pivot lever until a comfortable position for the corresponding functional part has been achieved. To ensure that the functional part at least approximately maintains this position and does not accidentally return to its original position, the pivot lever is normally automatically locked in the corresponding position to prevent it from being adjusted back in the opposite direction to the adjustment direction. This is usually achieved by a locking mechanism that engages in a positive-locking manner. However, adjustment further in the adjustment direction is possible at any time from the corresponding position of the pivot lever.To return the pivot lever to its original position, the pivot lever must first be moved in the adjustment direction to a certain end position. This deactivates the locking mechanism until the pivot lever has been pivoted back to its original position. The locking mechanism is then reactivated to lock the pivot lever again after it has been positioned accordingly along the adjustment direction.

[0004] The well-known swivel joints are widely used but are usually quite complex to install and therefore ultimately quite expensive. This is especially true because the swivel joints are usually quite large and solid in order to meet the requirements for reliability and durability.

[0005] Therefore, the object of the present invention is to design and develop the pivot joint mentioned at the outset and described in more detail above in such a way that the costs of the pivot joint can be reduced without having to accept any significant losses in terms of reliability and longevity.

[0006] This object is achieved in a swivel joint according to the preamble of claim 1 in that the swivel lever can be locked in a plurality of locking positions provided between the starting position and the end position by a blocking clamping engagement of at least one clamping element in a tapered clamping gap formed between a shaft and a ring which at least partially receives the shaft during adjustment in a return direction opposite to the adjustment direction, that the shaft and the ring are adjustable relative to one another from an adjustment position into a return position and that the shaft and the ring are held in a form-fitting and / or force-fitting manner in the return position during adjustment in the return direction in such a way that the clamping element is not held in a clamping manner with play in the clamping gap and / or outside the clamping gap.

[0007] Securing the pivot lever against reversing in the return direction after the pivot lever has been adjusted in the adjustment direction via a clamp enables very precise adjustment of the pivot lever. The adjustment of the pivot lever is not, for example, tied to a predetermined detent or pitch, as is typically the case with locking mechanisms comprising pawls and gear rings. Rather, the clamping is provided by the clamping engagement of at least one clamping element in at least one clamping gap, which allows for continuous adjustment or locking of the pivot lever as required. The clamping gap tapers so that the clamping element reliably clamps into the clamping gap when the pivot joint is adjusted in the return direction.The clamping gap is also formed between a shaft and a ring that at least partially accommodates the shaft, which enables simple production with high reliability.

[0008] The shaft and the ring are nevertheless designed to be adjustable relative to one another from an adjustment position to a reset position. This means that a clamping engagement of the clamping element in the clamping gap does not always occur in all cases. This can be deliberately prevented so that the pivot lever can be pivoted back to its original position. From the original position, the pivot lever can then be adjusted again in the adjustment direction to adjust the pivot joint until the desired position of the pivot lever is reached. In this position, the pivot lever is again secured against re-adjustment by the clamping engagement of the at least one clamping element in the at least one clamping gap.Thus, starting from an end position, the shaft and the collar are held in a positive and / or non-positive alignment in the return position during adjustment in the return direction, preventing the clamping element from jamming. Specifically, this is achieved by holding the clamping element in a non-clamping manner, i.e., with play between the shaft and / or the collar, in the clamping gap and / or outside the clamping gap. This also supports simple production of the swivel joint while maintaining its high reliability. Ultimately, this also allows for low manufacturing costs while maintaining sufficient durability.

[0009] In a first particularly preferred embodiment of the pivot joint, the shaft and the ring are provided such that they can be adjusted back and forth between the reset position and the adjustment position, partly together and partly against each other, by rotating them about the pivot axis of the pivot joint. This allows easy adjustment of the pivot joint in the adjustment direction and also enables defined return adjustment in the return direction to reach the starting position. It is particularly preferred if the shaft and the ring have corresponding cams that rest against one another and / or slide against one another at least in sections when adjusting from the adjustment position to the return direction and / or at least in sections back.The cams can therefore be used, if necessary, to rotate the shaft and the rim together around the pivot axis of the pivot joint by appropriately engaging the cams. The cams then rest against each other, for example. Alternatively, the cams can also slide against each other and thus jump over each other, allowing the shaft and the rim to be easily adjusted between two basic relative positions, such as the setting position and the reset position.

[0010] If necessary, the crown and the shaft can be connected in the adjustment position by positive engagement, particularly by contact with the cams, or by frictional engagement, so that when adjusting in the adjustment direction, the crown and the shaft rotate together, particularly concentrically, around the pivot axis. This allows for a potential locking of the pivot joint in many intermediate positions when adjusting the pivot joint or pivot lever in the adjustment direction, in a structurally simple manner. This also allows the user to adjust the pivot joint very precisely.

[0011] According to the invention, the ring and the shaft are connected to one another in the reset position in a form-fitting manner, in particular by the cams being in contact, or in a frictional manner.

[0012] This allows the crown and the shaft to rotate together around the pivot axis during adjustment in the return direction. This simply and reliably prevents jamming of the at least one clamping element in the at least one clamping gap when returning the pivot joint to its original position.

[0013] If the rim and / or the shaft comprises at least one spring means, this can be arranged such that the spring means presses the cams of the rim and shaft against each other in the reset position. This preloads the connection between the rim and shaft, particularly in the direction of the adjustment position. This not only ensures a defined connection and positioning of the shaft and rim in the reset position, but also reliably supports and ultimately simplifies the adjustment of the pivot joint from the reset position to the adjustment position.

[0014] Clamping of the swivel joint in a specific position of the pivot lever should generally be reliably ensured. However, it should also regularly be possible to smoothly return the swivel joint to its original position without the at least one clamping element becoming jammed in the at least one clamping gap. For this purpose, it is advisable if the at least one clamping element is held, in particular with a form-fitting fit, in the ring or in the shaft. In this case, it is also particularly expedient for adjusting the swivel joint between the setting position and the return position if the at least one clamping element is held on the ring or on the shaft with a significant amount of play.

[0015] It can be particularly simple and reliable if the at least one clamping element is a roller. The roller can then roll along the shaft or the rim as needed without causing increased friction. In addition, a clamping element in the form of a roller can reliably and easily reach a clamping position within the at least one clamping gap. However, it can be disadvantageous that the roller, in the clamping position, can only transmit the clamping forces to the shaft and the rim via linear contact surfaces. Therefore, the at least one clamping element can also be designed differently than in the form of a roller, if required.

[0016] A compact and durable design of the swivel joint can be achieved if, for example, the ring and the shaft are each at least partially accommodated in a housing element. This is even more true if the ring is arranged in the housing element so that it can rotate at least partially about the pivot axis. Additionally or alternatively, the shaft can also be arranged in the housing element so that it can rotate at least partially about the pivot axis. Both of these options result in high functionality while simultaneously requiring minimal design effort.

[0017] The housing element can have an adjustment stop for engaging a housing stop of the crown during adjustment in the adjustment direction, and a return stop for engaging a housing stop of the crown during adjustment in the return direction. This allows the pivot joint to be easily adjusted back and forth between the adjustment position and the return position by adjusting the pivot lever. The adjustment is triggered by the stops as needed, but at least supported.

[0018] The same applies to the additional or alternative case where the shaft has an adjustment stop for engaging an adjustment shaft stop of the crown when adjusting in the adjustment direction and a reset stop for engaging a reset shaft stop of the crown when adjusting in the reset direction. Here, too, only the pivot lever needs to be pivoted as needed to switch back and forth between the adjustment position and the reset position of the pivot joint, with the adjustment being initiated or at least assisted by the stops.

[0019] A very simple and therefore cost-effective design of the swivel joint can be achieved if the adjustment stop of the housing element and the adjustment housing stop of the ring, on the one hand, and the adjustment stop of the shaft and the adjustment shaft stop of the ring, on the other, are coordinated with one another. This allows the adjustment housing stop of the ring to initially strike the adjustment stop of the housing element when adjusting in the adjustment direction. Only after further adjustment in the adjustment direction—the corresponding distance traveled by the swivel lever is also referred to as the release travel—does the adjustment shaft stop of the ring strike the adjustment stop of the shaft in an end position.

[0020] Alternatively or additionally, it can contribute to a cost-effective design of the swivel joint if the reset stop of the housing element and the reset housing stop of the ring, on the one hand, and the reset stop of the shaft and the reset shaft stop of the ring, on the other hand, are coordinated with one another in the swivel joint. Thus, during adjustment in the reset direction, the reset housing stop of the ring can first strike the reset stop of the housing element before, after further adjustment in the reset direction, the reset shaft stop of the ring strikes the reset stop of the shaft in an initial position. The distance traveled by the pivot lever during the corresponding adjustment of the swivel joint is also referred to as the release travel.

[0021] To achieve more uniform force transmission, which leads to more reliable function of the swivel joint and a longer service life of the swivel joint, the shaft and / or the ring can have at least two, in particular at least three, preferably at least four, cams. This allows even larger forces to be transmitted reliably, so that the swivel joint can be manufactured in a smaller and thus more cost-effective manner. In principle, the same advantages can be achieved if, alternatively or additionally, at least two, in particular at least three, preferably at least four, clamping elements and / or spring elements are provided.

[0022] To further simplify the swivel joint, without permanently impairing its function, the swivel lever can be at least partially connected to the housing element in a rotationally fixed manner. For the same reason, the mounting lever can alternatively or additionally be at least partially connected to the shaft in a rotationally fixed manner.

[0023] The invention is explained in more detail below with reference to a drawing which merely represents an exemplary embodiment. Fig. 1A-Leg first swivel joint according to the invention in two different positions each in a perspective view, Fig. 2A-Leg detail of the swivel joint from Fig. 1 in an exploded view in two different perspective views, Fig. 3 the swivel joint from Fig. 1 in a sectional view, Fig. 4A-B the detail of the swivel joint from Fig. 2 in two different positions in side view, Fig. 5A-BSectional views of the detail of the swivel joint from Fig. 4 along the section planes VA-VA and VB-VB Fig. 4A , Fig. 6A-BSectional views of the detail of the swivel joint from Fig. 4 along the section planes VIA-VIA and VIB-VIB Fig. 4A-B , Fig. 7 a detail of a seating furniture with a swivel joint for adjusting a functional part, Fig. 8A-leg second swivel joint according to the invention in two different positions each in a perspective view, Fig. 9A-B the swivel joint from Fig. 8 in an exploded view in two different perspective views and Fig. 10A-leg detail of the swivel joint from Fig. 8 in an exploded view in two different perspective views.

[0024] In the Fig. 1A-B a swivel joint 1 for adjusting a functional part is shown, which can be used to adjust a functional part, such as a headboard, a footboard or an armrest, of a piece of furniture, such as a seat or a recliner. The swivel joint 1 has a mounting lever 2 for mounting the swivel joint 1 on the furniture and a swivel lever 3 for supporting and adjusting the functional part relative to the rest of the furniture. The swivel lever 3 can be swiveled relative to the mounting lever 2 about a swivel axis 4 of the swivel joint 1. The swivel range of the swivel lever 3 is limited in the direction of an adjustment direction E by an end position and in the direction of the return direction R opposite to the adjustment direction E by an initial position. The adjustment range available for the actual adjustment of the swivel lever 3 or functional part is smaller than the adjustment range between the initial position and the end position.Before the starting position and before the end position, a so-called release path of the pivot lever 3 is provided, which is not used to adjust the pivot lever 3 or the functional part, but to adjust the pivot joint 1 from the setting position to the reset position and back again. In the setting position, the pivot lever 3 can only be adjusted as desired in the direction of adjustment E. In the reset direction R, this is not possible or only possible to a very limited extent. Adjustment of the pivot lever 3 in the reset direction R is prevented by a clamping block of the pivot joint 1. In the reset position of the pivot joint 1, however, it is possible to adjust the pivot joint 1 back to an initial position of the pivot lever 3 without the pivot joint 1 becoming clamped block.Once it has reached the starting position, the swivel joint 1 is forced back into the setting position, while once it has reached the end position, the swivel joint 1 is forced back into the reset position.

[0025] In the Fig. 2A-B The components of the swivel joint 1, with the exception of the mounting lever 2 and the swivel lever 3, are shown in exploded views. The swivel joint 1 has a housing element 5, into which a ring 6 is at least partially inserted. A shaft 7 is also provided, partially inserted into the ring 6 and into the housing element 5. The ring 6 in the illustrated and thus preferred swivel joint 1 is designed in two parts and comprises a ring 8, which engages positively with connecting receptacles 10 of the ring 6 via connecting ribs 9. The shaft 7 in the illustrated and thus preferred swivel joint 1 is also designed in two parts and comprises a cover 11, which engages positively with connecting receptacles 13 of the shaft 7 via connecting ribs 12.The connecting ribs 12 and the connecting receptacles 13 of the shaft 7 have laterally beveled flanks that can deflect against each other if the pivot lever 3 is pressed too forcefully in the return direction R in the adjustment position of the pivot joint 1. In this way, a so-called overload protection is provided, which prevents damage to the pivot joint 1 due to excessive force input. In such a case, the connecting ribs 12 and the connecting receptacles 13 of the shaft 7 disengage from each other, thus enabling adjustment of the pivot lever 3 in the return direction R.

[0026] Four clamping elements 14 in the form of rollers are positively secured at regular intervals on the ring 6. A cam 15 and a spring element 16 are provided between each individual clamping element 14. The cams 15 are designed such that they can be deflected radially outwards if a sufficient force is applied against these cams 15 in an outward direction. The spring elements 16 can be deflected in the circumferential direction against a corresponding restoring force. The deflection of the cams 15 and the spring elements 16 takes place by a corresponding rotation of the shaft 7 in the ring 6. For this purpose, the shaft 7 has corresponding cams 17 and spring surfaces 18. In principle, the cams and spring surfaces could also be provided on the ring 6 if the shaft 7 then had the deflectable cams and spring elements.

[0027] The rim 6 of the illustrated and, in this respect, preferred pivot joint 1 comprises, in the region of the ring 8, an adjustment shaft stop 19, a reset shaft stop 20, an adjustment housing stop 23, and a reset housing stop 22, each of which points in the circumferential direction and can come into contact in this direction with an adjustment stop 23 and a reset stop 24 of the shaft 7, as well as with an adjustment stop 25 and a reset stop 26 of the housing element 5. The corresponding contact is enforced by adjusting the pivot lever 3, which, in the illustrated pivot joint 1, is rotationally fixed to the housing element 5. The adjustment shaft stop 19 and the reset shaft stop 20 of the ring 8 are arranged between the adjustment housing stop 21 and the reset housing stop 22 of the rim 6.A stop rib 27 carrying the setting stop 23 and the reset stop 24 of the shaft 7 thus engages between the setting shaft stop 19 and the reset shaft stop 20. On both sides of the ring 8, stop ribs 28 adjoin, which, on their sides facing away from the stop rib 27 of the shaft 7, between the setting housing stop 21 and the reset housing stop 22, receive a stop rib 29 of the housing element 5, which provides the setting stop 25 and the reset stop 26 on its circumferential sides.

[0028] In the Fig. 3 a section through the swivel joint 1 is shown. The assembly lever 2 shown on the right can be connected to a piece of furniture and is also connected to the shaft 7 of the swivel joint 1. In the swivel joint 1 shown, the assembly lever 2 is connected in a rotationally fixed manner to the cover 11 of the shaft 7. The cover 11 of the shaft 7 engages in the ring 8 of the crown 6. The remaining part of the crown 6 is arranged predominantly in the housing element 5. The connecting ribs 12 of the shaft 7 are pressed into the connecting receptacles 13 of the shaft 7 by springs 30 in the form of disc springs. If excessive force is applied, the overload protection is triggered by compressing these springs 30 and thus disengaging the connecting ribs 12 and the connecting receptacles 13 of the shaft 7.The corresponding components of the swivel joint 1 are held together in a form-fitting manner by a sleeve 36, which in this case is provided concentrically to the swivel axis 4 of the swivel joint 1.

[0029] In the Fig. 4A is a detail of the swivel joint 1 in the adjustment position for adjusting the swivel joint 1 in the adjustment direction E to a comfortable position. In the Fig. 4B In contrast, the same detail of the swivel joint 1 is shown in the reset position, in which the swivel lever 3 can be moved back from the end position to the starting position.

[0030] In the Fig. 5A-B is the detail from the Fig. 4A shown in different sectional views perpendicular to the pivot axis 4 of the pivot joint 1, whereby the section in the Fig. 5A by the cams 15,17 and clamping elements 14 of the swivel joint 1 and the cut in the Fig. 5B through the spring elements 16 and spring surfaces 18 of the pivot joint 1. In the adjustment position, the spring surfaces 18 are arranged between the spring elements 16 without exerting any significant pressure against the spring elements 16 when adjusting the pivot lever 3 in the adjustment direction E. The spring elements 16 therefore remain at least substantially undeflected and therefore do not exert any significant restoring forces on the spring surfaces 18.

[0031] If the pivot lever 3 is pivoted in the adjustment direction E, the housing element 5 rotates to the right with the pivot lever 3. The clamping elements 14 roll along the circumferential inner surface of the housing element 5. The ring 6, together with the clamping elements 14, can rotate slightly to the right, but only until the cams 15 of the ring 6 come into contact with the cams 17 of the shaft 7. Since the assembly lever 2 connected to the shaft 7 is not pivoted, the shaft 7 remains in its position and thus also holds the ring 6 more or less in its position. In this way, the pivot lever 3 ultimately reaches the position that the user of the furniture finds comfortable.

[0032] However, if the pivot lever 3 is pivoted in the opposite return direction R, this is prevented by a blocking engagement of the clamping elements 14 in the associated clamping gaps 31 between the housing element 5 and the shaft 7. In this case, the housing element 5 with the pivot lever 3 is rotated slightly to the left, whereby the clamping elements 14 rolling on the circumferential inner surface 32 of the housing element 5 also move to the left into the associated clamping gaps 31 until the clamping elements 14 are held clamped in the clamping gaps 31 and block further rotation of the housing element 5 or the pivot lever 3 in the return direction R. The pivot lever 3 therefore remains locked in the corresponding position and can only be pivoted further in the direction of adjustment direction E.

[0033] If the pivoting lever 3 is pivoted into the end position in the adjustment direction E, the adjustment stop 25 of the housing element 5 initially comes into contact with the adjustment housing stop 21 of the ring 8. As a result, the housing element 5 presses the ring 6 to the right and, with its cams 15, in this direction against the cams 17 of the shaft 7. As a result of the force introduced via the pivoting lever 3, the cams 15 of the ring 6 are deflected outwards and slide over the cams 17 of the shaft 7 to the right. In the process, the spring elements 14 are pressed against the spring surfaces 18 of the shaft 7 and deformed accordingly. The spring elements 14 therefore generate a restoring force in the restoring direction R.However, the release travel to be covered by the pivot lever 3 is small and limited by the contact of the adjustment shaft stop 19 with the adjustment stop 23 of the shaft 7, while at the same time the adjustment stop 25 of the housing element 5 is in contact with the adjustment housing stop 21 of the ring 6. The pivot lever 3 and the pivot joint 1 are thus in an end position, with the pivot joint 1 having been adjusted to the reset position.

[0034] In the Fig. 6A-B is the detail from the Fig. 4B shown in different sectional views perpendicular to the pivot axis 4 of the pivot joint 1, whereby the section in the Fig. 6A by the cams 15,17 and clamping elements 14 of the swivel joint 1 and the cut in the Fig. 6B through the spring elements 16 and spring surfaces 18 of the swivel joint 1. The Fig. 6A-B show the swivel joint 1 in the reset position. In the reset position, the pivot lever 3 can be adjusted together with the housing element 5 in the reset direction R to the left towards the starting position. In this case, the clamping elements 14 rolling along the circumferential inner side 32 of the housing element 5 cannot reach a clamping position in the clamping gap 31. The ring 6 can only be adjusted slightly to the left with the housing element 5, since then the cams 15 of the ring 6 come into contact with the cams 17 of the shaft 7 and prevent further penetration of the clamping elements 14 into the clamping gap 31.

[0035] Only when the pivot lever 3 or the pivot joint 1 has almost reached its starting position does the reset stop 26 of the housing element 5 come into contact with the reset housing stop 22 of the ring 6. If the pivot lever 3 is moved further towards the starting position, the reset stop 26 of the housing element 5 presses the cams 15 of the ring 6 against the corresponding cams 17 of the shaft 7, so that the cams 15 of the ring 6 are deflected outwards and slide to the left over the cams 17 of the shaft 7. This is supported by the restoring force exerted by the spring elements 16 on the spring surfaces 18 of the shaft 7, which acts in the same direction. After a short further release travel, the pivot lever 3 returns to its starting position, in which the reset shaft stop 20 rests against the reset stop 24 of the shaft 7. At the same time, the reset housing stop 22 rests against the reset stop 26 of the housing element 5.Further adjustment of the swivel joint 1 or the swivel lever 3 in the return direction R is thus prevented. The swivel joint 1 can now be adjusted again in the adjustment direction E as previously described.

[0036] In the Fig. 7 the pivot joint 1 is shown installed in a piece of furniture 33. In this example, the assembly lever 2 is connected to the backrest 34 of a piece of upholstered seating furniture. The pivot lever 3 carries a functional part 35 in the form of a headrest, which, as a result of the pivot joint 1, can be adjusted forwards relative to the backrest 34 in the adjustment direction E until the functional part 35 assumes a position that is comfortable for the user of the furniture 33. In the return direction R, however, the adjustment of the functional part 35 is blocked as long as the pivot joint 1 has not been adjusted to the end position, whereby the pivot joint 1 moves from the adjustment position to the return position and can be adjusted back to the starting position.

[0037] In the Fig. 8A-B Another pivot joint 1 for adjusting a functional part is shown, which can be used to adjust a functional part, such as a headboard, a footboard or an armrest, of a piece of furniture, such as a seating or reclining furniture. The pivot joint 1 has a structure that differs from that shown in the Fig. 1 bis 6 The two swivel joints 1 are, however, at least essentially comparable in terms of functionality. Therefore, the same reference numerals are used for analogous components of the swivel joints 1.

[0038] The Fig. 8A-B The swivel joint 1 shown has a mounting lever 2 for mounting the swivel joint 1 on the furniture and a swivel lever 3 for supporting and adjusting the functional part relative to the rest of the furniture. The swivel lever 3 can be swiveled relative to the mounting lever 2 about a swivel axis 4 of the swivel joint 1. The swivel range of the swivel lever 3 is limited in the direction of an adjustment direction E by an end position and in the direction of the return direction R opposite to the adjustment direction E by an initial position. The adjustment range available for the actual adjustment of the swivel lever 3 or functional part is smaller than the adjustment range between the initial position and the end position. A so-called release travel of the swivel lever 3 is provided before the initial position and before the end position, which is not used for adjusting the swivel lever 3 orthe functional part, but serves to adjust the swivel joint 1 from the setting position to the reset position and back again. In the setting position, the swivel lever 3 can only be adjusted as desired in the direction of adjustment E. In the reset direction R, this is not possible or only possible to a very small extent. Adjusting the swivel lever 3 in the reset direction R is prevented by the swivel joint 1 becoming jammed. In the reset position of the swivel joint 1, however, it is possible to adjust the swivel joint 1 back to an initial position of the swivel lever 3 without the swivel joint 1 becoming jammed. Once it has reached the initial position, the swivel joint 1 is forcibly adjusted back to the setting position, whereas once it has reached the end position, the swivel joint 1 is forcibly adjusted back to the reset position.

[0039] In the Fig. 9A-B The components of the swivel joint 1 are shown in exploded views, while in the Fig. 10A-B Details of these exploded views are shown. Fig. 9A-B and Fig. 10A-B are described together below. The pivot joint 1 has a housing element 5, into which a ring 6 is at least partially inserted. A shaft 7 is also provided, partially inserted into the ring 6 and into the housing element 5. The housing element 5 and the pivot lever 3 are pivotally mounted relative to the shaft 7 and the mounting lever 2. The shaft 7 is fixed in a rotationally fixed manner relative to the mounting lever 2 via intermeshing teeth 37, 38.

[0040] Four clamping elements 14 in the form of rollers are positively secured at regular intervals on the ring 6. A cam 15 and a spring element 16 are provided between each individual clamping element 14. The cams 15 are designed such that they can be deflected radially outwards if a sufficient force is applied against these cams 15 in an outward direction. The spring elements 16 can be deflected in the circumferential direction against a corresponding restoring force. The deflection of the cams 15 and the spring elements 16 takes place by a corresponding rotation of the shaft 7 in the ring 6. For this purpose, the shaft 7 has corresponding cams 17 and spring surfaces 18. In principle, the cams and spring surfaces could also be provided on the ring 6 if the shaft 7 then had the deflectable cams and spring elements.

[0041] The ring 6 of the illustrated and, in this respect, preferred pivot joint 1 comprises four setting shaft stops 19, four reset shaft stops 20, one setting stop 25, and one reset stop 26 on the housing element 5. In principle, other numbers of the corresponding stops would also be conceivable. In particular, two setting shaft stops 19 and two reset shaft stops 20, or one setting shaft stop 19 and one reset shaft stop 20, could be sufficient. The ring 6, on the other hand, has one setting housing stop 21 and one reset housing stop 22, while the shaft 7 has four setting stops 23 and four reset stops 24. Here, too, a different number of stops would be conceivable. The corresponding stops each point in the circumferential direction. When the pivot lever 3 is pivoted in the adjustment direction E, the housing element 5 rotates around the ring 6 and the shaft 7.Shortly before the assembly lever 3 reaches its end position in the adjustment direction E, the adjustment stop 25 comes into contact with the adjustment housing stop 21 of the ring 6 and adjusts the ring 6 relative to the shaft 7 so that the cams 15 of the ring 6 slide over the cams 17 of the shaft 7. Subsequently, after the pivoting lever 3 has pivoted a short further distance, the release travel, the adjustment shaft stops 19 of the housing element 5 come into contact with the adjustment stops 23 of the shaft 7. The pivoting lever 3 can now no longer be pivoted in the adjustment direction E. However, the pivoting lever 3 can now be pivoted back in the return direction R without this leading to a blocking of the pivot joint 1.After the pivot lever 3 has been pivoted back in the return direction R almost to its initial position, the return stop 26 of the housing element 5 comes into contact with the return housing stop 22 of the ring 6, so that the ring 6 is again adjusted relative to the shaft 7. This time, the cams 15 of the ring 6 slide in the opposite direction over the cams 17 of the shaft 7. The pivot lever 3 can now be pivoted a short distance further, the release travel, in the return direction R until the return shaft stops 20 come into contact with the return stops 24 of the shaft 7. The pivot lever 3 can then no longer be pivoted in the return direction R.

[0042] The functionality of the Fig. 8 bis 10 The swivel joint 1 shown is therefore very similar to the one used in connection with the Fig. 5 and 6 explained functionality of the Fig. 1 shown swivel joint 1. For this reason, the function of the swivel joint shown in the Fig. 8 bis 10 shown swivel joint 1 also on the Fig. 5 and 6 and the relevant description. List of reference symbols

[0043] 1Pivot joint 2Mounting lever 3Pivot lever 4Pivot axis 5Housing element 6Rim 7Shaft 8Ring 9Connecting rib 10Connecting receptacle 11Cover 12Connecting ribs 13Connecting receptacles 14Clamping elements 15Cam 16Spring element 17Cam 18Spring surfaces 19Adjusting shaft stop 20Resetting shaft stop 21Adjusting housing stop 22Resetting housing stop 23Adjusting stop 24Resetting stop 25Adjusting stop 26Resetting stop 27-29Stop rib 30Spring 31Clamping gap 32Inner surface 33Furniture 34Backrest 35Functional part 36Sleeve 37,38Toothing EAdjustment direction RResetting direction

Claims

1. Pivot joint (1) for adjusting a functional part (35), in particular a head part, a foot part or an armrest, of a piece of furniture (33), in particular a piece of seating furniture and / or reclining furniture, with a mounting lever (2) for mounting of the swivel joint (1) on the furniture (33) and a swivel lever (3) for supporting and adjusting the functional part (35), wherein the mounting lever (2) and the swivel lever (3) are connected to one another in a manner pivotable from an initial position to an end position about a swivel axis (4) in an adjusting direction (E), wherein the swivel lever (3) is lockable in a plurality of locking positions between the initial position and the end position by a blocking clamping engagement of at least one clamping element (14) in a tapered clamping gap (31) formed between a shaft (7) and a collar (6) at least partially receiving the shaft (7) during adjustment in a return direction opposite to the adjustment direction (E), wherein the shaft (7) and the collar (6) are adjustable relative to one another from a setting position into a reset position, and wherein the shaft (7) and the collar (6) are held in the reset position in a form-fitting and / or force-fitting manner in alignment with one another during adjustment in the reset direction (R) in such a way that the clamping element (14) is not held clampingly with a clamping force a clearance in the clamping gap (31) and / or outside the clamping gap (31), characterized in that the collar (6) and the shaft (7) in the reset position are connected to one another in a form fit or friction fit in such a way that when they are adjusted in the return direction (R), the collar (6) and the shaft (7) rotate jointly around the swivel axis (4).

2. Pivot joint according to claim 1, characterized in that the collar (6) and the shaft (7) are connected to another in the setting position in a form fit, in particular by abutment of the cams (15, 17), or in a friction fit in such a way that the collar (6) and the shaft (7) rotate together about the swivel axis (4) during an adjusting in the adjustment direction (E).

3. Pivot joint according to claim 1 or 2, characterized in that the collar (6) and the shaft (7) are connected to one another in a form fit in the reset position by the cams (15, 17) bearing against one another in such a way that the collar (6) and the shaft (7) rotate jointly about the pivot axis (4) during adjustment in the reset direction (R).

4. Pivot joint according to any one of claims 1 to 3, characterized in that the collar (6) and / or the shaft (7) comprise at least one spring means (16) such that the spring means (16), in the reset position, can move the cams (15, 16) of the collar (6) and shaft (7) against each other, particularly in the direction of the setting position.

5. Pivot joint according to one of claims 1 to 4 characterized in that the at least one clamping element (14) is held in the collar (6) or in the shaft (7), in particular with a positive fit.

6. Pivot joint according to one of claims 1 to 5, characterized in that the at least one clamping element (14) is a roller.

7. Pivot joint according to any one of claims 1 to 6, characterized in that the collar (6) and the shaft (7) are respectively at least partially accommodated in a housing element (5) and that the collar (6) is at least partially arranged in the housing element (5) in a way to be pivotable about the pivot axis (4).

8. Pivot joint according to claim 7, characterized in that the housing element (5) has an adjustment stop (25) for bearing against an adjustment housing stop (21) of the collar (6) during adjustment in the adjustment direction (E) and a reset stop (26) for bearing against a reset housing stop (22) of the collar (6) during adjustment in the reset direction (R).

9. Pivot joint according to claim 7 or 8, characterized in that the shaft (7) has an adjustment stop (23) for bearing against an adjustment shaft stop (19) of the collar (6) or of the housing element (5) during adjustment in the adjustment direction (E) and against a reset stop (24) for abutment against a reset shaft stop (20) of the collar (6) or the housing element (5) during adjustment in the reset direction (R).

10. Pivot joint according to claim 9, characterized in that the adjusting stop (25) of the housing element (5) and the adjusting housing stop (21) of the collar (6), on the one hand, and the adjusting stop (23) of the shaft (7) and the adjusting shaft stop (19) of the collar (6) or of the housing element (5), on the other hand, are positioned relative to one another such that when adjusting in the adjusting direction (E), first the adjusting housing stop (21) of the collar (6) abuts against the adjusting stop (25) of the housing element (5) and only after further adjustment in the setting direction (E), the adjusting shaft stop (19) of the collar (6) or of the housing element (5) abut against the adjusting stop (23) of the shaft (7) in an end position.

11. Pivot joint according to claim 9 or 10, characterized in that the reset stop (26) of the housing element (5) and the reset housing stop (22) of the collar (6) on the one hand and the reset stop (24) of the shaft (7) and the reset shaft stop (20) of the collar (6) or of the housing element (5) on the other hand are arranged relative to one another in such a way that, during adjustment in the reset direction (R), the reset housing stop (22) of the collar (6) abuts against the reset stop (26) of the housing element (5) first and only after a further adjustment in the reset direction (R), the reset shaft stop (20) of the rim (6) or of the housing element (5) abuts against the reset stop (24) of the shaft (7) in an initial position.

12. Pivot joint according to any one of claims 1 to 11, characterized by the fact that the shaft (7) and / or the collar (6) has at least two, in particular at least three, preferably at least four, cams (15, 17) and / or that at least two, in particular at least three, preferably at least four, clamping elements (14) and / or spring elements (16) are provided.

13. Pivot joint according to any one of claims 1 to 12, characterized in that the swivel lever (3) is at least partially non-rotatably connected to the housing element (5) and / or that the mounting lever (2) is at least partially non-rotatably connected to the shaft (7).