EP4515062A1

EP4515062A1 - Hinge for pivot door

Info

Publication number: EP4515062A1
Application number: EP23722688.1A
Authority: EP
Inventors: Fabio FALCOMER
Original assignee: Master Costruzioni Techniche Di Sicurezza Srl
Current assignee: Master Costruzioni Techniche Di Sicurezza Srl
Priority date: 2022-04-28
Filing date: 2023-04-15
Publication date: 2025-03-05
Anticipated expiration: 2043-04-15
Also published as: IT202200008522A1; EP4515062B1; WO2023209489A1; CN119096025A

Abstract

The present invention relates to a hinge (5, 6) for a pivot door (1) comprising a wing (4) which rotates about an axis of rotation (R). This hinge (5, 6) comprises: an anchoring element (7) suitable for being inserted and fixed, in use, in a cavity formed in a floor (P) or in a wall (S), and a connecting element (42) to connect, in use, the hinge (5, 6) to the wing (4) of the pivot door (1); the connecting element (42) being rotatable about an axis of rotation with respect to the anchoring element (7). The aforementioned hinge (5, 6) also includes a first adjustment system for adjusting the position of the connecting element (42), and therefore, also of said wing (4), according to a predetermined axis with respect to the anchoring element (7); and a second adjustment system for adjusting the position of the connecting element (42), and therefore, also of said wing(4), on a predetermined plane substantially orthogonal to said predetermined axis. Said second adjustment system comprises a movable member (19) which is movable, with respect to the anchoring element (7), on a plane substantially parallel to said predetermined plane and is provided with at least one tapered portion (21). Said second adjustment system also comprises a plurality of adjustment elements (27) facing the tapered portion (21) of the movable member (19) and movable along a respective movement axis substantially orthogonal to said predetermined plane so that said elements (27), moving along said respective movement axis, exert on said tapered portion (21) a thrust having at least one force component directed parallel to said predetermined plane thus causing the movable member (19) to move on a plane substantially parallel to said predetermined plane.

Description

HINGE FOR PIVOT DOOR

DESCRIPTION

The present invention relates to a hinge for a pivot door.

In particular, this hinge is advantageously applied to the field of armoured pivot doors or doors designed to offer a given amount of resistance to burglary, although it can also be adequately used in pivot doors of other types.

In general, a pivot door is a door that opens and closes by rotating about a respective vertical axis arranged at an intermediate area of the door wing and defined by a lower pin and an upper pin anchored to the floor and to the portion of the wall above the compartment for installation of the pivot door - respectively.

There are currently various types of hinges for pivot doors available on the market, which however have some technical disadvantages and drawbacks.

In conventional hinges for this type of use, the parts required for adjusting the position of the revolving wing are normally provided inside the door wing itself; this will, in many cases, make the required adjustment operations on these parts rather complicated and it furthermore implies the need to design the door also according to the dimensions of these adjustment parts.

These adjustment parts are generally of considerable size, particularly in cases in which it is possible to adjust the position of the door wing when it is fully installed.

Furthermore, in cases where the adjustment parts are located in an intermediate area of the door wing and adjustment of the position is allowed with the door wing fully installed, it is necessary to provide for the possibility of acting on these adjustment members from an area on the perimeter of the door wing or from an area easily accessible from the outside.

Furthermore, in currently existing pivot doors, the rotation of the corresponding wing is generally driven by a pin-upper seat system and a pin- lower seat system, which could produce irregular wear of the rotation members and/or noisy friction in the event of poor maintenance of the rotation parts or in case of inaccurate coaxiality between the upper rotation pin and lower rotation pin.

The object of the present invention is to solve the prior art issues referred to here above.

Another object of the invention is to provide a hinge for a pivot door which can be placed, in use, outside the revolving wing of the door, thus avoiding taking up space inside it.

A further object of the invention proposed here is to provide a hinge for a pivot door, which is structured in such a way as to be able to adjust the position of the door wing easily and quickly, with the door fully installed.

Another object of the invention is to provide a hinge for a pivot door which allows the position of the wing to be adjusted according to three orthogonal axes.

Yet another object of the present invention is to provide a hinge for a pivot door, such as to make the operations for installing the door particularly simple and straightforward.

Another object of the invention is to provide a hinge for a pivot door which can be associated with a door wing having a simple structure and which can therefore be manufactured at low costs.

Therefore, a specific object of the present invention is a hinge for a pivot door comprising a wing that is rotatable about a rotation axis, wherein said hinge comprises: an anchoring element able to be inserted and fixed, in use, in a cavity formed in a floor or wall; a connecting element for connecting, in use, the hinge to the wing of the pivot door; the connecting element being rotatable about a rotation axis with respect to the anchoring element; a first adjustment system for adjusting the position of the connecting element, and therefore, also of said wing, according to a predetermined axis with respect to the anchoring element; and a second adjustment system for adjusting the position of the connecting element, and therefore, also of said wing, on a predetermined plane substantially orthogonal to said predetermined axis; said second adjustment system comprising a movable member which is movable, with respect to the anchoring element, on a plane substantially parallel to said predetermined plane and is provided with at least one tapered portion; said second adjustment system also comprising a plurality of adjustment elements facing the tapered portion of the movable member and movable along a respective movement axis substantially orthogonal to said predetermined plane so that said adjustment elements, moving along said respective movement axis, exert on said tapered portion a thrust having at least one force component directed in a parallel direction to said predetermined plane, thus causing the movable member to move on a plane substantially parallel to said predetermined plane.

According to the present invention, said tapered portion can be tapered towards the connecting element.

Preferably, said tapered portion has a truncated cone or conical or truncated pyramidal or pyramidal shape.

In accordance with the present invention, said second adjustment system can comprise a plurality of threaded members facing said adjustment elements and operating on said adjustment elements in such a way that the screwing or unscrewing of at least one threaded member causes a displacement of at least one adjustment element along the related movement axis.

According to a particularly advantageous aspect of the invention, said second adjustment system can comprise a plurality of elastic members acting on said adjustment elements in such a way as to push said adjustment elements towards said threaded members.

In accordance with the present invention, said plurality of adjustment elements can comprise a first pair of adjustment elements mutually opposite with respect to the movable member and a second pair of adjustment elements mutually opposite with respect to the movable member.

Preferably, according to the present invention, the orthogonal projections of the adjusting elements of said first pair of adjusting elements and of said second pair of adjusting elements on a plane parallel to said predetermined plane are arranged at angular distances of about 90° from one another.

According to the present invention, said hinge can comprise a plurality of guide elements to guide the movement of said plurality of adjustment elements along the respective movement axes.

According to an advantageous aspect of the invention, said first adjustment system can comprise a first thread and a second thread, which are engaged with each other and configured so that a rotation of said first thread relative to said second thread causes the connecting element to move along said predetermined axis with respect to the anchoring element.

Preferably, said hinge comprises a plurality of notches which are integral with the first thread and accessible from the outside of said hinge, so that by performing a rotation manoeuvre on at least one notch, a rotation of the first thread is achieved with respect to the second thread.

Characteristics and advantages will become more obvious from the following description of a preferred but not exclusive embodiment illustrated, purely by way of non-limiting example, in the accompanying drawings, in which:

- figure 1 is a cutaway axonometric view of a pivot door, closed, incorporating a lower hinge and an upper hinge according to the present invention;

- figure 2 is a detail cutaway axonometric view extrapolated from figure 1;

- figure 3 is a cutaway axonometric view of the pivot door shown in figure 1, in the open position;

- figure 4 is a detail cutaway axonometric view taken from figure 3;

- figure 5 is an axonometric view of the lower hinge shown in figures 1 and 2;

- figure 6 is a top plan view of the hinge shown in Figure 5;

- figure 7 is a cross-sectional view taken along the section line A-A indicated in figure 6;

- figure 8 is a cross-sectional view taken along the section line B-B indicated in figure 6;

- figure 9 is an exploded view of the hinge of figure 5, from a top viewpoint;

- figure 10 is an exploded view of the hinge of figure 5, from a bottom viewpoint;

- figure 11 is an axonometric view wherein the hinge of figure 5 is illustrated connected to a fastening assembly integral with the wing of the pivot door;

- figure 12 is an exploded view of what is shown in figure 11;

- figure 13 is a top plan view from the top of what is shown in figure 11 ; and

- figure 14 is a cross-sectional view along the section line C-C indicated in figure 13.

With reference to the figures enclosed herein, 1 indicates a pivot door, which can be installed, for example, in a corresponding compartment formed in a vertical wall 2. This pivot door 1 comprises a frame 3, fixed on the surfaces of the vertical part 2 which define the aforesaid compartment, and a wing 4 arranged in the space defined by the frame 3 so that it can be rotatable about a vertical rotation axis R passing through an intermediate area of the wing 4.

In order to enable wing 4 to be rotatable about the rotation axis R, the pivot door 1 comprises a lower hinge 5 and an upper hinge 6, equal to each other, connected to a bottom portion of the wing 4 and to its top portion - respectively, and anchored to the floor P and to the upper wall portion S above the aforementioned compartment - respectively.

Specifically, the lower hinge 5 develops axially according to an axial direction X and comprises a sump or container 7 with a substantially cylindrical shape, intended to be placed and anchored by means of a fixing material or substance (for example, cement or a chemical type anchor) in a corresponding cavity formed in the floor P.

The container 7 is also provided, at the top, with a circular lip 8 protruding outwards and intended to come into contact with the floor P during installation of the pivot door 1.

A plurality of grooves 9 extending parallel to the axial direction X are obtained instead on the external cylindrical surface of the container 7 to help the anchoring of the container 7 to the floor P.

An internal thread 10 is also provided in a lower portion of the inner surface of the container 7 ; while in the central area of the bottom 11 of the same container 7 a central through hole 12 is formed for the possible drainage of liquids that could reach this lower hinge 5.

The lower hinge 5 also includes a bottom 13 composed of a cylindrical wall 14 and a bottom 15 provided at the base of said cylindrical wall 14.

On the external surface of the cylindrical wall 14 of the bottom 13 there is an external thread 16 configured to engage with the internal thread 10 of the container 7 by mutual screw tightening.

In the bottom member 15 of the bottom 13, a central through hole 17 is made centrally to allow the outflow of liquids in conjunction with the central through hole 12 of the container 7.

Four peripheral through holes 18 are also formed in the cylindrical wall 14 of the bottom 13, directed parallel to the axial direction of the bottom 13, i.e. to the axial direction X.

The lower hinge 5 also comprises a central adjustment member 19, in turn composed of a cylindrical lower portion 20 and a truncated cone upper portion 21, wherein a central shaped through hole 22 is formed axially, consisting of a radially enlarged portion and an underlying radially narrowed portion formed within the upper truncated cone portion 21 and the lower cylindrical portion 20 - respectively.

In particular, the lower cylindrical portion 20 protrudes radially with respect to the base of the upper truncated cone portion 21 and is configured in such a way that it can be housed, with clearance, in the cavity of the bottom 13 formed by the cylindrical wall 14 and the related bottom 15.

The truncated-cone upper portion 21 of the central adjustment member 19 is instead tapered upwards, i.e. in the opposite direction with respect to the bottom 13.

In accordance with technical variants of the present invention not shown in the attached figures, instead of the aforesaid truncated cone upper portion 21, a tapered upper portion can be provided having a shape other than the truncated cone one, for example a conical, truncated pyramidal or pyramidal shape.

In the lower hinge 5 an intermediate annular element 23 is also provided wherein there is a central through hole 24 at which four grooves 25 are also obtained, arranged, one with respect to the other, at an angular distance of about 90°. In more detail, each groove 25 extends substantially parallel to the axial direction of the intermediate annular element 23, coinciding with the aforesaid axial direction X, and is externally defined by an inclined outer wall 26, substantially flat, extending inwards from top to bottom, i.e. from the top to the bottom of the same intermediate annular element 23.

In each groove 25 a respective adjustment block 27 is slidably housed wherein a distal surface 28 is defined (i.e. a surface that is distal with respect to the axial direction X), substantially flat, having the same inclination as the inclined outer wall 26 of the groove 25 where it is housed.

In each adjustment block 27 a respective proximal surface 29 is also defined (i.e. a surface that is proximal with respect to the axial direction X) opposite the distal surface 28 and having an inclination such as to substantially match, in use, the outer surface of the truncated cone upper portion 21 of the central adjustment member 19.

Therefore, in the assembled configuration of the lower hinge 5, the distal surface 28 and the proximal surface 29 of each adjustment block 27 are in contact with the inclined outer wall 26 of the related groove 25 and with the outer surface of the truncated cone upper portion 21 of the central adjustment member 19 - respectively.

Between the flat top surface of the lower cylindrical portion 20 of the central adjustment member 19 and the lower surface of each adjustment block 27 there is a respective compression spring 30 which operates in such a way as to push constantly upwards, i.e. in the direction opposite the bottom 13, the corresponding adjustment block 27.

In particular, the upper portion of each compression spring 30 is housed in a lower cavity 27' obtained at the bottom of the corresponding adjustment block 27, to prevent its relative displacement.

In the intermediate annular element 23, too, four peripheral through holes 31 are made, directed in a parallel direction to the axial direction of the intermediate annular element 23 itself (i.e. to the axial direction X) and matching the peripheral through holes 18 of the bottom 13 when the lower hinge 5 is in its assembled configuration (see fig. 7).

The lower hinge 5 also includes an annular covering element 32 intended to be arranged, in use, above the intermediate annular element 23.

Four peripheral threaded blind holes 33 are obtained in the annular covering element 32 extending from the bottom of the annular covering element 32 parallel to the axial direction of the latter (i.e. to the axial direction X of the lower hinge 5) and arranged in such a way as to match the peripheral through holes 31 of the intermediate annular element 23 when the lower hinge 5 is assembled.

In the annular covering element 32 four threaded through holes 34 are also provided directed in a parallel direction to the axial direction of the annular covering element 32 itself and made in positions such as to end up, at the bottom, in the four grooves 25 of the intermediate annular element 23 when the lower hinge 5 is in its assembled configuration.

On the top surface of the annular covering element 32 there are also four radial notches 35 arranged at a mutual angular distance of approximately 90°.

The function performed by the aforementioned radial notches 35 will be explained in detail in the continuation of this description.

To keep the bottom 13, the intermediate annular element 23 and the annular covering element 32 firmly joined together, four fixing screws 36 are provided which pass freely through the peripheral through holes 18 of the bottom 13 and the peripheral through holes 31 of the intermediate annular element 23 and which engage, at the top, in the threaded peripheral blind holes 33 of the annular covering element 32.

Therefore, in the assembled configuration of the lower hinge 5, the central adjustment member 19 and also the adjustment blocks 27 with the related compression springs 30 are located in the internal space jointly defined by the bottom 13, by the intermediate annular element 23 and by the annular covering element 32.

A respective adjustment dowel 37 is engaged in each threaded through hole 34 of the annular covering element 32 so that it can go downwards by screwing, also lowering the underlying adjustment block 27, and go upwards by unscrewing, also causing the adjustment block 27 to go up under the thrust action of the related compression spring 30, or vice versa.

The lower portion of a connecting pin 38 is housed in the portion of the central through hole 22 at the truncated-cone upper portion 21 of the central adjustment member 19, arranged to abut against the upper surface of the lower cylindrical portion 20 identified inside the central through hole 22, so that, in use, at least a portion of the connecting pin 38 protrudes above the annular covering element 32, passing through it.

A threaded axial hole 39 is also made at the bottom of the connecting pin 38.

To achieve mutual joining between the connecting pin 38 and the central adjustment member 19, a central screw 40 is provided which freely passes through the lower portion of the central through hole 22, corresponding to the lower cylindrical portion 20, engaging at the top in the axial threaded hole 39 of the connecting pin 38.

The end of the connecting pin 38 opposite to that with the threaded axial hole 39 is instead engaged in a bearing 41, which is in turn connected to an anchoring pin 42, so that this is enabled to be rotatable about a rotation axis corresponding to the aforementioned axial direction X with respect to the connecting pin 38.

Preferably but not limitedly, this bearing 41 is a combined needle roller bearing able to support both an axial and a radial load.

For the sake of brevity, the structure of the upper hinge 6 will not be described here, since it is identical to the lower hinge 5 described in detail here above.

For the installation of the pivot door 1 it is first necessary to insert and anchor the container 7 of the lower hinge 5, in the assembled configuration, in a corresponding cavity previously created in the floor P, bringing to abut against it the lower surface of the circular lip 8 of the container 7.

For the connection of the lower hinge 5 to the wing 4, instead, a lower mechanical assembly 43 is provided comprising a tubular element 44 with a rectangular section intended to be fixed to the lower part of the wing 4.

An upper slot 45 and a lower slot 46 are obtained in the upper wall and in the lower wall of the tubular element 44, respectively, extending in a straight line from one end of the tubular element 44 to its intermediate zone and overlapping one another other so as to jointly form a rectilinear guide 47.

In more detail, the tubular element 44 is fixed to the lower part of the wing 4 in such a way that the aforesaid rectilinear guide 47 opens into an opening 48 formed in a side edge of the door wing 4 itself.

At the intermediate area of the tubular element 44 in which the rectilinear guide 47 ends, an "L"-shaped anchoring bracket 50 bearing a nut 51 is fixed by means of tightening screws 49.

In particular, the nut 51 is rigidly connected to the anchoring bracket 50 in such a way that the threaded through hole 52 of the nut 51 is open or accessible on both sides and oriented parallel to the development direction of the rectilinear guide 47.

The lower mechanical assembly 43 also comprises a locking member 53 provided with a lower portion 54 shaped in such a way as to be able to go through the inside of the tubular element 44 when an intermediate portion of the locking member 53 is inserted into the aforementioned upper slot 45.

In the upper part of the locking member 53, a through hole is instead made in which a tightening screw 55 is inserted, oriented in a parallel direction to the development direction of the rectilinear guide 47 and therefore to the axis of the nut 51.

Similarly, for the connection of the upper hinge 6 to the wing 4, an upper mechanical assembly 56 is provided, identical to the lower mechanical assembly 43 described above and arranged in the upper part of the wing 4 in a mirror-like way to the lower mechanical assembly 43 with respect to a plane of horizontal symmetry.

To connect the wing 4 to the lower hinge 5 and to the upper hinge 6 previously inserted in and anchored to the floor P and the upper wall portion S above the installation compartment for the pivot door 1, respectively, it is necessary to first remove the respective locking member 53 from the lower mechanical assembly 43 and from the upper mechanical assembly 56 and to subsequently move the wing 4 in such a way as to simultaneously insert, up to the stop, the anchor pin 42 of the lower hinge 5 in the tubular element 44 of the lower mechanical assembly 43 through the lower slot 46 and the anchor pin of the upper hinge 6 in the tubular element of the upper mechanical assembly 56 through the slot of said tubular element which is lower than the other corresponding slot.

Once these operations have been completed, the wing 4 of the pivot door 1 must be anchored both to the lower hinge 5 and to the upper hinge 6 by inserting the locking members 53 of the lower mechanical assembly 43 and of the upper mechanical assembly 56 in the tubular element 44 of the lower mechanical assembly 43 and in the tubular element of the upper mechanical assembly 56 - respectively, and tightening the tightening screws 55 in the related nut 51 so as to lock and rigidly connect the anchoring pin 42 of the lower hinge 5 and the anchoring pin of the upper hinge 6 to the lower mechanical assembly 43 and to the upper mechanical assembly 56 - respectively.

At this point, the wing 4 of the pivot door 1 will be free to rotate about the rotation axis R passing through the rotation axis of the lower hinge 5 and the rotation axis of the upper hinge 6.

While to adjust the position of the wing 4 on the horizontal plane, i.e. on a plane parallel to the floor P, it is possible to act directly on the adjustment dowels 37 of the lower hinge 5 and/or of the upper hinge 6 after the wing 4 has been connected to said hinges 5, 6.

By carrying out screwing or unscrewing on the aforesaid adjustment dowels as appropriate, using special operating tools, it is possible to make them go down or go up under the elastic action of their respective compression springs 30 and thus achieve adjustment of the position of the related central adjustment member 19 on the aforementioned horizontal plane via the transversal (i.e. horizontal) component of the thrust exerted by the proximal surface 29 of the adjustment blocks 27 on the upper truncated- cone portion 21 of the central adjustment member 19.

While to adjust the position of the wing 4 in the vertical direction, i.e. according to an axis orthogonal to the floor P, it is possible to use a special tool on the radial notches 35 of the lower hinge 5 and/or of the upper hinge 6 after the wing 4 has been connected to said hinges 5, 6.

By performing circular manoeuvers on the radial notches 35, the effect obtained is the screwing or unscrewing of the external thread 16 of the bottom 13 on the internal thread 10 of the container 7 and therefore the lowering or lifting of the bottom 13 (and of all the components of the hinge connected directly or indirectly to the bottom 13, with the exception of the container 7) with respect to the container 7.

As can be inferred from the preceding description, the hinge for pivot doors according to the invention proposed herein offers several advantages.

The use of hinges according to the present invention allows all the necessary operations to adjust the position of the wing to be performed quickly and easily when this is already installed or already connected to the related lower and upper hinges; this allowing in particular to achieve a very high level of accuracy in positioning the wing.

Furthermore, when the wing is installed, both the upper and lower hinges are almost entirely outside of the wing itself; this allows in particular not to have any constraint in the dimensioning of the wing due to the use of such hinges.

In addition to these advantages, there is also the fact that the use of hinges according to the present invention makes it possible to greatly simplify and speed up the operations for installing the pivot door, with a consequent significant reduction in the related installation times.

It is understood that the above has been described by way of nonlimiting example, so that any construction variations should be considered as falling within the scope of the present technical solution, as described above and claimed below.

Claims

CLAIMS Hinge (5, 6) for a pivot door (1) comprising a wing (4) which is rotatable about a rotation axis (R), wherein said hinge (5, 6) comprises: an anchoring element (7) suitable, in use, to be inserted in and fixed to a cavity which is formed in a floor (P) or in a wall (S); a connecting element (42) for connecting, in use, the hinge (5, 6) with the wing (4) of the pivot door (1); the connecting element (42) being rotatable about a rotation axis relative to the anchoring element (7); a first adjusting system for adjusting the position of the connecting element (42) and as a consequence also said wing (4) according to a predetermined axis relative to the anchoring element (7); and a second adjusting system for adjusting the position of the connecting element (42) and as a consequence also said wing (4) on a predetermined plane which is substantially orthogonal to said predetermined axis; said second adjusting system comprising a movable member (19) which is movable relative to the anchoring element (7) on a plane being substantially parallel to said predetermined plane and is provided with at least one tapered portion (21); said second adjusting system also comprising a plurality of adjusting elements (27) facing the tapered portion (21) of the movable member (19) and being movable along a respective movement axis which is substantially orthogonal to said predetermined plane such that said adjusting elements (27) moving along said respective movement axis exert on said tapered portion (21) a thrust having at least one force component which is directed parallel to said predetermined plane, causing in this way the movable member (19) to move on a plane which is substantially parallel to said predetermined plane.

2. Hinge (5, 6) according to claim 1, characterized in that said tapered portion (21) is tapered towards the connecting element (42).

3. Hinge (5, 6) according to claim 1 or 2, characterized in that said tapered portion (21) has a truncated cone shape or a cone shape or a truncated pyramid shape or a pyramid shape.

4. Hinge (5, 6) according to any one of preceding claims, characterized in that said second adjusting system comprises a plurality of threaded members (37) facing said adjusting elements (27) and acting on said adjusting elements (27) such that the screwing or unscrewing of at least one threaded member (37) causes at least one adjusting element (27) to move along the relative movement axis.

5. Hinge (5, 6) according to claim 4, characterized in that said second adjusting system comprises a plurality of elastic members (30) acting on said adjusting elements (27) in such a way as to push said adjusting elements (27) towards said threaded members (37).

6. Hinge (5, 6) according to any one of preceding claims, characterized in that said plurality of adjusting elements (27) comprises a first pair of adjusting elements (27), which are opposite each other with respect to the movable member (19), and a second pair of adjusting elements (27) which are opposite each other with respect to the movable member (19).

7. Hinge (5, 6) according to claim 6, characterized in that orthogonal projections of the adjusting elements (27) of said first pair of adjusting elements (27) and of said second pair of adjusting elements (27) on a plane parallel to said predetermined plane are at angular distances of about 90° from one another.

8. Hinge (5, 6) according to any one of preceding claims, characterized in that it comprises a plurality of guide elements (25) for guiding the motion of said plurality of adjusting elements (27) along respective movement axes.

9. Hinge (5, 6) according to any one of preceding claims, characterized in that said first adjusting system comprises a first thread (16) and a second thread (10), which are engaged with each other and configured such that a rotation of said first thread (16) relative to said second thread (10) causes the connecting element (42) to move along said predetermined axis relative to the anchoring element (7).

10. Hinge (5, 6) according to claim 9, characterized in that it comprises a plurality of notches (35) which are integral with the first thread (16) and accessible from the outside of said hinge (5, 6), such that a rotation of the first thread (16) relative to the second thread (10) is achieved by performing a rotation operation on at least one notch (35).