Pivot hinge and pivoting door leaf

Abstract

A pivot hinge has a pivot pin member for pivotally connecting a pivoting door leaf to a structural element. The hinge includes a first cam follower on a first side of the pivot pin member and a second cam follower on a second side of the pivot pin member opposite the first side, both the first cam follower and the second cam follower being movable in a radial direction relative to the cam. A slidable reciprocating member is disposed within the housing and has a first end and a second end rigidly connected to each other. The cam has a pair of recesses. A spring arrangement is disposed between the second cam follower and the second end and urges the first cam follower and the second cam follower against the cam and into the respective recesses to provide a holding torque to hold the door leaf in the holding position.

Description

Technical Field

[0001] The invention relates to the field of pivot hinges having a pivot pin member for pivotally connecting a pivoting door leaf to a structural element, such as a floor or ceiling of a building or a door frame mounted in or on the floor or ceiling of a building, the door leaf having an upper edge, a lower edge, an inner edge and an outer edge, and defining a vertical pivot axis of the door leaf, wherein the pivot pin member has a cam, the pivot hinge comprising a first cam follower on a first side of the pivot pin member and a second cam follower on a second side of the pivot pin member opposite to the first side. The pivot hinge comprises spring means adapted to urge the cam follower against the cam. Background Art

[0002] These pivot hinges are usually mounted to pivot doors. To mount a pivot door, the pivot pin member is usually coupled to a suitable opening in a structural element (e.g., a ceiling or floor or a door frame). For example, the pivot pin member may extend from the lower edge or upper edge of the pivot door. For example, the opening may be provided in the structural element itself, or in a dedicated mounting plate to be fixed to the structural element. Alternatively, the pivot hinge may be mounted to a structural element (e.g., a floor, a ceiling or a door frame provided therein or thereon).

[0003] The pivot pin member and the opening are generally engaged so that the pivot pin member has a fixed position relative to the opening and the pivot door has a fixed position relative to the structural element (e.g., ceiling and / or floor or door frame), except for rotation about a vertical pivot axis defined by the pivot pin member. In other words, by using a pivot hinge, the pivot door can rotate about the vertical pivot axis and thus can swing between open and closed positions. In doing so, the cam follower then rotates relative to the cam of the pivot pin member.

[0004] The cam of the pivot pin member is typically shaped such that upon rotation of the pivot door (and hence the cam followers) relative to the pivot pin member, the diameter of the cam seen between the first cam follower and the second cam follower changes. This means that for one or both of the cam followers, the radial position relative to the cam changes in that rotation.

[0005] An example of a pivot hinge is disclosed in US3474485, on which the preamble of claim 1 is based. The pivot hinge disclosed in this document has a heart-shaped cam, the profile of which has a vertex with two convex surfaces adjacent to each other and a concave portion opposite the vertex, which is defined by the concave surface of the cam. A first cam follower is arranged in a housing on a first side of a pivot pin member and is pushed against the cam by a corresponding first spring, which is mounted between a first end of the housing and the first cam follower. A second cam follower is arranged in a housing on a second side of the pivot pin member opposite to the first side and is pushed against the cam by a set of concentric second springs. The set of second springs is mounted between a second end of the housing and the second cam follower. In the holding position of the door leaf, the set of second springs pushes the second cam follower into the concave portion of the cam to provide a holding torque to hold the door leaf in the holding position. The known pivot hinge is provided with hydraulic damping, because the cam followers are each mounted on a corresponding piston that divides the internal space of the housing into three chambers. Hydraulic oil is filled into each of the chambers and may pass between the chambers through passages and channels to provide a damping effect to slow the movement of the door leaf.

[0006] Another prior art pivot hinge is disclosed in DE102010022047. The pivot hinge disclosed in this document has a heart-shaped cam, the profile of which has a vertex with two convex surfaces adjacent to each other and a concave portion opposite to the vertex, which is defined by the concave surface of the cam. A first cam follower is arranged on a corresponding piston in a housing on a first side of a pivot pin member and is pushed against the cam by a corresponding first spring, which is mounted between a first end of the housing and a piston provided with the first cam follower. A second cam follower is arranged on a corresponding piston in a housing on a second side of the pivot pin member opposite to the first side. The pistons are connected to each other via a tie rod, which is fixed to one of the pistons at one end and can be axially moved relative to the other piston at its other end. The so-called clearance compensation spring on the tie rod is configured to keep the cam follower in contact with the cam without clearance, but does not provide the holding torque of this known pivot hinge. The holding torque is provided by a spring device mounted between the second cam follower and the housing. Summary of the invention

[0007] It is an object of the present invention to provide an alternative pivot hinge. It is another object of the present invention to provide a compact pivot hinge. It is a further object of the present invention to provide a pivot hinge with improved holding torque. It is a further object of the present invention to provide a pivot hinge with improved durability.

[0008] One or more of these objects are achieved by a pivot hinge according to claim 1 .

[0009] A pivot hinge with a slidable reciprocating member allows for a compact pivot hinge. The spring device is located on the second side of the pivot pin member. The spring device mounted between the second end of the slidable reciprocating member and the second cam follower pushes the first cam follower and the second cam follower against the cam when the force exerted by the spring device on the second end is transmitted via a rigid connection to the first end of the slidable reciprocating member coupled to the first cam follower. This is advantageous, for example, because it allows the vertical pivot axis to be located close to the edge of the door while still being able to provide a strong and / or elongated spring device. That is, the distance between the edge of the door leaf and the pivot axis is not dependent on the size of the spring device.

[0010] Another advantage is that, due to the rigid connection between the first and second ends of the slidable reciprocating member, the forces acting on the second end are equal to the forces acting on the first end, and the forces exerted on the cam by the first and second cam followers are equal but opposite. This results in a balanced pivot hinge. For example, the cam and therefore the pivot pin member are not subjected to effective unidirectional radial forces, such as to impose a permanent load on the mounting of the pivot pin member in the housing. This undesirable situation exists in the pivot hinges of US3474485 and DE102010022047.

[0011] The spring device is or can be arranged under a pre-tension (eg an adjustable pre-tension).

[0012] The pivoting door leaf can be a large and heavy door, such as a glass door. The pivoting door leaf can have an outer contour. In its embodiment, the housing can be integrated in the outer contour or be part of the outer contour.

[0013] The cam has a recess configured to receive two cam followers to form at least one holding position for the door leaf, such as an open and / or closed position of the door leaf or one or more positions therebetween. That is, when the door leaf is rotated about the pivot pin member, the cam followers are pushed into the recess by the spring means while following the profile of the cam and rotating along the profile of the cam. This results in a holding torque that holds the door leaf in said position. The recess essentially results in the cam having locally a reduced diameter (i.e. an inner diameter that is smaller than the outer diameter of the cam), as seen between the first cam follower and the second cam follower.

[0014] A pair of recesses is provided so that both cam followers are retained in respective recesses simultaneously. This provides a significant holding moment controlled by the action of the spring means in combination with the slidable reciprocating member. For example, multiple pairs of recesses may be provided at right angles to each other, one pair of recesses corresponding to the closed position of the door leaf and another pair of recesses corresponding to the open position of the door leaf.

[0015] In another embodiment, the pivot hinge further comprises a slidable guide member movably mounted within the slidable reciprocating member, the slidable guide member being coupled to the second cam follower, and the spring means being arranged between the slidable guide member and the second end. The slidable guide member transmits the spring force to the second cam follower. Thus, when the spring means pushes the second cam follower against the cam, the slidable guide member facilitates radial movement of the second cam follower relative to the pin member. Similarly, when the second cam follower compresses the spring means, the slidable guide member facilitates radial movement of the second cam follower relative to the second end.

[0016] The slidable guide member may also advantageously increase the stability of the spring device and / or the compression of the spring device by the second cam follower and / or the stability of the radial movement of the second cam follower due to the spring force. The slidable guide member may, for example, be made of a metal material such as steel or a plastic material such as polyoxymethylene (POM). Plastic materials are advantageous for reducing friction during sliding movement.

[0017] In a practical embodiment, the slidable guide member is elongated and has a hole in which the spring device is received. This is for example useful for protecting the spring device and / or providing further stability and stiffness to the spring device in order to prevent undesirable deformation thereof, such as out-of-plane deformation relative to the plane in which the spring device is compressed / extended.

[0018] In one embodiment, the slidable reciprocating member has a sliding surface that is slidably engaged with the housing. The sliding engagement can be a direct engagement between the slidable reciprocating member and the housing, or an intermediate guide surface can be provided therebetween. The sliding surface can, for example, be provided at the lower and / or upper part of the slidable reciprocating member and is slidably engaged with the lower and / or upper part of the housing. The sliding surface can (for example, additionally) be provided on the first end and / or the second end. The slidable reciprocating member can, for example, be made of a metal material such as steel or a plastic material such as POM. The plastic material is conducive to reducing friction during sliding movement.

[0019] In order to further promote the sliding movement of the slidable reciprocating member, the sliding surface of the slidable reciprocating member and / or the part (e.g., the lower part and / or the upper part) with which the corresponding sliding surface is slidably engaged can be provided with friction reduction measures. These measures can, for example, relate to the surface treatment (e.g., using a friction reduction coating) of the surface of the housing and / or the slidable reciprocating member. In particular, the surface of the sliding engagement. For example, the material of the manufacturing slidable reciprocating member and / or the housing can be hardened and / or impregnated (e.g., with a copolymer).

[0020] In yet another embodiment, the housing is provided with internal ribs to slidably support the slidable reciprocating member.

[0021] In a practical embodiment, the spring arrangement comprises a helical spring, for example two concentric helical springs or two parallel helical springs. The parallel helical springs can be arranged side by side, but a concentric arrangement is preferred for reasons of compactness. One or more springs (e.g. one or more helical springs) are selected to suit the spring requirements (e.g. stiffness) of the pivoting door leaf. Arranging a plurality of helical springs concentrically allows the use of an appropriate combination of standard springs to meet the requirements, without the need to design a special spring for the case at hand.

[0022] In one embodiment, the slidable reciprocating member has one or more tie rods for rigidly connecting the first end and the second end. The first end and the second end can be made of a metal material such as steel or a plastic material such as POM, for example, and the tie rod can be made of steel, preferably stainless steel. The tie rod can form an outer profile for the slidable reciprocating member, or the tie rod can be received within the outer profile of the slidable reciprocating member. In addition, the tie rod can extend outside the cam, or the tie rod can be received in a recess in the cam.

[0023] In an embodiment, the slidable guide member has a sliding surface that is slidably engaged with the pull rod and / or a sliding surface that is slidably engaged with the housing. The sliding engagement may be a direct engagement between the slidable guide member and the pull rod and / or the housing, or an intermediate guide surface may be provided therebetween. These sliding surfaces may, for example, be provided at the lower and / or upper part of the slidable guide member and be slidably engaged with the lower and / or upper part of the housing and / or the pull rod. The sliding surface of the slidable guide member that is engaged with the housing may be aligned with the sliding surface of the slidable reciprocating member so that these surfaces may, for example, be supported by the same internal ribs of the housing.

[0024] In order to further promote the sliding movement of the slidable guide member, the sliding surface of the slidable guide member and / or the part (e.g., the lower part and / or the upper part) with which the corresponding sliding surface is slidably engaged can be provided with friction reduction measures. These measures can, for example, relate to the surface treatment of the surface of the housing and / or the slidable guide member (e.g., with a friction reduction coating). In particular, the surface of the slidable engagement. For example, the material of the manufacturing slidable guide member and / or the housing can be hardened and / or impregnated (e.g., with a copolymer).

[0025] In a further embodiment, the cam follower is a cam wheel. That is, the cam wheel rotates about its own vertical body axis due to engagement with a cam that rotates about a vertical pivot axis. This reduces wear due to friction between the cam follower and the cam, for example. The cam wheel may, for example, be made of steel, preferably stainless steel, and the cam may, for example, be made of steel. The cam wheel may be provided with bearings. Alternatively, one or more of the cam followers are fixed pins that do not rotate about their own vertical body axis.

[0026] The cam may have a sliding surface that is slidably engaged with the housing. These sliding surfaces and / or portions of the housing with which corresponding sliding surfaces are slidably engaged may be provided with friction reducing measures as discussed above (eg, for a slidable guide member or a slidable reciprocating member).

[0027] The invention further relates to a pivoting door leaf provided with a pivot hinge as described herein.

[0028] In an embodiment, the pivot hinge is mounted to the lower edge of the door leaf, for example in the corner region between the inner edge and the lower edge of the pivoting door leaf.

[0029] In yet another embodiment, the pivot hinge is mounted so that the hinge extends along the lower edge of the pivoting door leaf and the first cam follower is located near the inside edge of the door leaf. Since the pivot hinge has a slidable reciprocating member that causes the two cam followers to push against the cam, the vertical pivot axis defined by the pivot pin member can be located near the inside edge of the door, with the spring means located on the opposite side of the pivot pin member.

[0030] The invention further relates to a structural element and a pivoting door leaf connected to the structural element via a pivot hinge as described herein, wherein the housing is mounted to the door leaf or the structural element, for example at the lower edge of the door leaf or embedded in the floor below the lower edge of the door leaf. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further explained with reference to the accompanying drawings, in which like reference numerals represent like parts.

[0032] In the figure:

[0033] Figure 1 A perspective view of a pivot hinge according to the invention is schematically shown.

[0034] Figure 2 Schematically shows Figure 1 A perspective view of the internal components of a pivot hinge.

[0035] Figure 3 Schematically shows Figure 1 A perspective view of a cross section of the pivot hinge along AA.

[0036] 4A to 4B schematically show Figure 1 The pivot hinge is shown along the section AA in the radially outward state of the cam follower and in the radially inward state of the cam follower.

[0037] Figure 5 and Figure 6 Schematically showing the Figure 1 The cam and cam follower of a pivot hinge.

[0038] Figure 7 Schematically shows Figure 1 Exploded view of the pivot hinge.

[0039] Figure 8 An exploded view of another pivot hinge according to the invention is schematically shown.

[0040] Fig. 9 Schematically shows Figure 8 A perspective view of a cross section of a pivot hinge.

[0041] Fig.10 A further embodiment of a pivot hinge according to the invention is schematically shown in cross section. DETAILED DESCRIPTION

[0042] exist Figure 1 4B shows a pivot hinge 1 having a pivot pin member 3 for pivotally connecting a pivoting door leaf to a structural element, the door leaf having an upper edge, a lower edge, an inner edge and an outer edge, and the pivot pin member 3 defines a vertical pivot axis P of the door leaf A .

[0043] The pivot hinge 1 comprises a housing 2 configured to be mounted to a door leaf or a structural element, for example to a lower edge of a door leaf, and a pivot pin member 3 configured to be fixed to the other of the door leaf and the structural element.

[0044] The pivot hinge 1 is suitable for being mounted to the lower edge of a door leaf, for example in a corner region between the inner edge and the lower edge of a pivoting door leaf. For example, the pivot hinge can be mounted so that the hinge extends along the lower edge of the pivoting door leaf and the first cam follower 5 is located near the inner edge of the door leaf.

[0045] exist Figure 2 In FIG. 4B it can be seen that the pivot pin member 3 has a cam 4 .

[0046] The pivot pin member 1 is rotatable relative to the housing 2 about a vertical pivot axis.

[0047] The pivot hinge 1 comprises a first cam follower 5 on a first side of the pivot pin member 3 and a second cam follower 6 on a second side of the pivot pin member 3 opposite to the first side. Both cam followers 5, 6 are movable in radial direction relative to the cam. The cam follower may be a cam wheel.

[0048] The pivot hinge 1 comprises spring means 30 adapted to urge the cam followers 5 , 6 against the cam 4 .

[0049] The cam 4 has a first pair of recesses 8, 9 opposite to each other and a second pair of recesses 7, 10. These pairs are perpendicular to each other.

[0050] The first pair of recesses 8, 9 are each configured to receive a respective one of the cam followers 5, 6 to form a first holding position of the door leaf, such as an open and / or closed position of the door leaf. The second pair of recesses 7, 10 cooperates with the cam followers 5, 6 to define another holding position of the door leaf.

[0051] The pivot hinge 1 is shown to include a U-shaped mounting member 60 fixed to the housing 2 at the upper portion 2a. In this mounting member 60, the pivot pin member 3 is rotatably received at its upper end so that the pivot pin member maintains its orientation relative to the housing 2 and can rotate around the axis of the pivot pin member.

[0052] The pivot hinge 1 further comprises a slidable reciprocating member 20 arranged in the housing 2 and movably mounted therein. The slidable reciprocating member 20 has a first end 21 and a second end 22 rigidly connected to each other. Thus, the slidable reciprocating member has a predetermined fixed length L. The first end 21 is coupled to the first cam follower 5, and the spring device 30 is arranged between the second cam follower 6 and the second end 22, so that the spring device 30 pushes both cam followers 5, 6 against the cam 4.

[0053] In Fig. 4A the radially outward state of the cam followers 5, 6 is shown, i.e. the cam followers 5, 6 are pushed outward by the outer local diameter of the cam 4, and the spring means 30 is compressed by the second cam follower 6. Due to the rigid connection between the first end 21 and the second end 22, the radially outward movement of the first cam follower 5 causes a sliding movement of the slidable reciprocating member 20, while the spring force of the spring means 30 is transmitted from the second end 22 to the first cam follower 5 so as to push it against the cam 4. In Fig. 4B the radially inward state of the cam followers 5, 6 is shown, wherein the spring means 30 pushes the followers 5, 6 against the cam at an inner local diameter that is smaller than the outer local diameter of the position of the cam 4 of Fig. 4A.

[0054] exist Figure 2 As can be seen in FIG. 1 , the slidable reciprocating member 20 has one or more tie rods 23 , 24 connecting the first end 21 and the second end 22 in a rigid manner.

[0055] The slidable reciprocating member 20 has a sliding surface 70 that is slidably engaged with the housing 2 .

[0056] The housing 2 is provided with inner ribs 50 to slidably support the slidable reciprocating member 20. These inner ribs 50 may be provided at the lower portion 2a of the housing 2 (e.g., Figure 2 and Figure 7 ) and / or the upper portion 2a of the housing 2 (e.g., Figure 7 ).

[0057] The pivot hinge 1 further comprises a slidable guide member 40 movably mounted within the slidable reciprocating member 30 , the slidable guide member 40 being coupled with the second cam follower 6 , and the spring device 30 being arranged between the slidable guide member 40 and the second end portion 22 .

[0058] The slidable guide member 40 may have a sliding surface which may slidably engage with the tie rods 23, 24, 25 (a potential fourth tie rod forming a symmetrical arrangement is not shown in the figure).

[0059] In this embodiment, the first cam follower 5 is retained on the first end portion 21 , and the second cam follower 6 is retained on the slidable guide member 40 .

[0060] The slidable guide member 40 has a sliding surface 41 that slidably engages the housing 2, here showing the lower portion 2a of the housing 2. The sliding surface 41 of the slidable guide member 40 is aligned with the sliding surface 50 of the slidable reciprocating member 20 so that these surfaces are supported by the same internal ribs of the housing.

[0061] exist Figure 1 4B , the slidable guide member 40 is elongated and has a hole in which the spring device 30 is received. The spring device 30 here comprises a helical spring, for example two concentric helical springs.

[0062] exist Figure 5 and Figure 6 The cam 4 and cam followers 5, 6 are shown in FIG. The cam 4 has two pairs of recesses 7, 8, 9, 10, each pair of recesses being configured to simultaneously receive both cam followers 5, 6 on either side of the cam 104, so as to form a door leaf holding position, for example, in the open and closed positions of the door leaf.

[0063] Figure 7 An exploded view of the pivot hinge 1 is schematically shown in FIG.

[0064] Figures 8 to 9 Another embodiment of a pivot hinge 300 according to the invention is shown. The pivot hinge 300 has a pivot pin member 303 for pivotally connecting a pivoting door leaf to a structural element, the door leaf having an upper edge, a lower edge, an inner edge and an outer edge, and the pivot pin member 303 defines a vertical pivot axis P of the door leaf. A The pivot hinge 300 includes a housing 302 configured to be mounted to a door leaf or a structural element, such as to a lower edge of a door leaf, and a pivot pin member 303 configured to be fixed to the other of the door leaf and the structural element.

[0065] The housing includes an upper portion 302a and a lower portion 302b.

[0066] exist Figures 8 to 9304, the pivot pin member 300 includes a first cam follower 305 on a first side of the pivot pin member 303 and a second cam follower 306 on a second side of the pivot pin member 303 opposite the first side. Both cam followers 305, 306 are movable in a radial direction relative to the cam 304.

[0067] The pivot hinge 300 is suitable for being mounted to the lower edge of the door leaf, for example, in a corner region between the inner edge and the lower edge of the pivoting door leaf. For example, the pivot hinge 300 can be mounted so that the hinge 300 extends along the lower edge of the pivoting door leaf and the first cam follower 305 is located near the inner edge of the door leaf.

[0068] The pivot hinge 300 comprises a spring device 330, 430 adapted to urge a cam follower 305 or 306 against a cam 304. The spring devices 330, 430 here each comprise a helical spring. The helical springs are arranged side by side, separated by a block 385. The cam 304 has recesses 308, 309 configured to receive one or both of the cam followers 305, 306 to form a holding position of the door leaf, such as an open and / or closed position of the door leaf or a position therebetween.

[0069] The spring devices 330 , 430 are arranged side by side in the housing 302 .

[0070] The cam followers 305, 306 are provided with bearings 305b, 306b, respectively.

[0071] The pivot hinge 300 further includes a slidable reciprocating member arranged in the housing 302 and movably mounted therein. The slidable reciprocating member has a first end 321 and a second end 322 rigidly connected to each other. The slidable reciprocating member further has a third end 422 rigidly connected to the first end 321. Therefore, the slidable reciprocating member has a predetermined fixed length. The first end 321 is coupled to the first cam follower 305. The spring device 330 is arranged between the second cam follower 306 and the second end 322, and the spring device 430 is arranged between the second cam follower 306 and the third end 422, so that the spring device 330 and / or the spring device 430 push both the cam followers 305, 306 against the cam 304.

[0072] The slidable reciprocating member has a tie rod 324 for connecting the first end portion 321 and the second end portion 322 , and the slidable reciprocating member has a tie rod 323 for connecting the first end portion 321 and the other end portion 422 .

[0073] The slidable reciprocating member has a sliding surface, such as sliding surface 370, that slidably engages the housing 302. The slidingly engaged surface may be treated with a surface treatment such as a friction reducing coating.

[0074] The housing 302 may be provided with internal ribs 350 to slidably support the slidable reciprocating member. These internal ribs 350 may be provided at the lower portion 302a of the housing 302 (e.g., Figure 8 ) and / or the upper part 302a of the housing 2.

[0075] exist Figures 8 to 9 In the embodiment of the present invention, the lower portion 302a of the housing is provided with recesses defined herein between the ribs 350 to facilitate the sliding movement of the slidable reciprocating member. The slidable reciprocating member can be in sliding engagement (i.e., direct contact) with the ribs 350 and / or recesses, or the slidable reciprocating member can slide in a manner where there is no direct contact between the slidable reciprocating member and the ribs 350 and / or recesses.

[0076] The pivot hinge 300 further includes a slidable guide member 340 movably mounted within the slidable reciprocating member, the slidable guide member 340 being coupled to the second cam follower 306 , and the spring means 330 , 340 being disposed between the slidable guide member 340 and the respective end portions 322 , 422 .

[0077] In this embodiment, the first cam follower 305 is retained on the first end 321 and the second cam follower 306 is retained on the slidable guide member 340 .

[0078] The slidable guide member 340 is elongated and has two holes that receive the tie rods 323 , 324 .

[0079] The pull rods 323 , 324 are received in a recess 304 c between the upper portion 304 a and the lower portion 304 b of the cam 304 .

[0080] The block 385 is disposed at the end of the housing 302 on the same side of the pivot pin member 303 as the first end 321. The block 380 is disposed at the opposite end of the housing 302.

[0081] Fig.10 Another embodiment of a pivot hinge according to the invention is illustrated.Herein, the spring device is implemented as a gas spring member 130 having a cylinder body and a piston rod defining a chamber in the gas spring member which is filled with pressurized gas.

Claims

1. A pivot hinge (1) having a pivot pin member (3) for pivotally connecting a pivoting door leaf to a structural element, the door leaf having an upper edge, a lower edge, an inner edge and an outer edge, and the pivot pin member defining a vertical pivot axis of the door leaf, wherein the pivot pin member has a cam (4), the pivot hinge comprises a first cam follower (5) on a first side of the pivot pin member and a second cam follower (6) on a second side of the pivot pin member opposite to the first side, the first cam follower (5) and the second cam follower (6) both being movable in a radial direction relative to the cam, Wherein the pivot hinge further comprises: a housing (2) configured to be mounted to the door leaf or the structural element, for example to the lower edge of the door leaf, the pivot pin member being configured to be fixed to the other of the door leaf and the structural element, - spring means adapted to urge the cam follower against said cam, wherein the cam includes a recess configured to receive a cam follower, Features A slidable reciprocating member (20) is arranged in the housing (2) and is movably mounted in the housing (2), wherein the slidable reciprocating member has a first end (21) on the first side of the pivot pin member (3) and a second end (22) on the second side of the pivot pin member (3), wherein the first end (21) and the second end (22) are rigidly connected (23, 24, 25) to each other, wherein the first end (21) is coupled to the first cam follower (5), wherein the cam (4) comprises at least one pair of recesses (7, 8, 9, 10), each recess being configured to receive a respective one of the first cam follower (5) and the second cam follower (6), wherein a pair of recesses is provided so that both the first cam follower (5) and the second cam follower (6) can be simultaneously retained in the respective recesses to form at least one retaining position of the door leaf, such as an open and / or closed position of the door leaf, The spring device (30) is arranged between the second cam follower (6) and the second end (22), and causes the first cam follower (5) and the second cam follower (6) to push against the cam (4), and the first cam follower (5) and the second cam follower (6) are pushed into corresponding recesses by the spring device (30) arranged between the second cam follower and the second end to provide a holding torque to hold the door leaf in the holding position of the door leaf.

2. A pivot hinge according to claim 1, wherein the pivot hinge (1) further comprises a slidable guide member (40) movably mounted within the slidable reciprocating member (20), the slidable guide member being connected to the second cam follower (6), and the spring device (30) being arranged between the slidable guide member and the second end.

3. A pivot hinge according to claim 2, wherein the slidable guide member (40) is elongated and has a hole in which the spring device (30) is received.

4. A pivot hinge according to claim 2 or 3, wherein the slidable reciprocating member (20) has a sliding surface that is slidably engaged with the housing.

5. A pivot hinge according to any one or more of the preceding claims, wherein the housing is provided with internal ribs (50) to slidably support the slidable reciprocating member (20).

6. Pivot hinge according to any one or more of the preceding claims, wherein the spring means (30) comprises a helical spring, such as two concentric helical springs or two parallel helical springs.

7. Pivot hinge according to claims 3 and 6, wherein a helical spring, for example two concentric helical springs, is received in the hole of the slidable guide member (40).

8. A pivot hinge according to any one or more of the preceding claims, wherein the slidable reciprocating member has one or more tie rods (23, 24, 25) rigidly connecting the first end (21) and the second end (22).

9. The pivot hinge according to claim 8, wherein the slidable guide member (40) has a sliding surface that is slidably engaged with the housing and / or has a sliding surface that is slidably engaged with the pull rod.

10. Pivot hinge according to any one or more of the preceding claims, wherein the cam follower (5, 6) is a cam wheel.

11. A pivoting door leaf provided with a pivot hinge according to any one or more of the preceding claims.

12. Pivoting door leaf according to claim 11, wherein the pivot hinge (1) is mounted to the lower edge of the door leaf, for example in a corner area between the inner edge and the lower edge of the pivoting door leaf.

13. A pivoting door leaf according to claim 12, wherein the pivot hinge is mounted such that it extends along the lower edge of the pivoting door leaf and the first cam follower is located adjacent the inner edge of the door leaf.

14. A structural element and a pivoting door leaf, the pivoting door leaf being connected to the structural element via a pivot hinge (1) according to any one or more of the preceding claims, wherein the housing (2) is mounted to the door leaf or the structural element, for example at the lower edge of the door leaf or embedded in the floor below the lower edge of the door leaf.

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