Door locking device comprising a notched shaft

Abstract

The invention relates to a door locking device (1) for holding a door closed, the device comprising a shaft (3) that has a first end (4) that is intended to rest on the ground and a lever system (6) that is movable in translation with respect to the shaft, the lever system comprising a tongue (7) that is intended to be positioned under the door and a handle (8) provided with a trigger (9) connected to an actuating device (10) for moving the lever system relative to the shaft, the lever system comprising locking means (11) for locking it with respect to the shaft and holding the door closed. According to the invention, the shaft (3) comprises multiple notches (2) forming a detent (16), in the locking position, the movement element (12) being intended to bear against one of the notches (2).

Description

Door locking device comprising a notched axle

[0001] The invention relates to a door locking device for keeping a door closed.

[0002] When someone attempts to force a door lock or force it open with a strong push (or force), the door usually eventually gives way and opens.

[0003] The locking device allows you to block a door, whether or not it has a lock, to prevent any type of intrusion. The locking device provides additional protection by keeping a door locked and making it immobile against any form of pressure. The locking device allows you to exert leverage between the door and the floor to make it immobile.

[0004] The locking device is particularly useful during an attack in a school, for example, where not all doors have locks or have weak locks. Once the children are gathered in a classroom, the locking device must allow the door to be blocked quickly.

[0005] There are locking devices such as that described in document FR3118983 comprising an axle having a first end intended to rest on the ground and a lever system movable in translation relative to the axle. The lever system comprises a tab intended to be positioned under the door and a handle provided with a trigger connected to an actuating device for moving the lever system relative to the axle.

[0006] The actuating device comprises a displacement element held on the axis by a spring and which is pivotable relative to the axis between a rest position in which the displacement element is substantially perpendicular to the axis so as to allow free translation of the lever system on the axis and a locking position in which the displacement element is inclined non-perpendicularly relative to the axis to move the lever system relative to the axis.

[0007] The locking position is achieved by actuating the trigger, causing the trigger to interact with the displacement element to tilt it non-perpendicularly to the axis and lock it on the axis. Prolonged actuation of the trigger causes the lever system to translate relative to the axis to lock the door.

[0008] The lever system also includes locking means to lock it relative to the axis and keep the door closed.

[0009] However, locking doors with these prior art locking devices is not always effective because the moving element sometimes slides along the shaft instead of being locked on the shaft. This problem occurs more particularly when a greasy substance, such as oil for example, is present on the shaft. This sliding causes a loss of time.

[0010] The aim of the invention is therefore to overcome the drawbacks of the prior art by proposing a locking device comprising a displacement element which does not slide along the axis, even in the presence of oil, thus making it possible to lock the doors more effectively and more quickly than those of the prior art.

[0011] To this end, the invention thus relates, in its broadest sense, to a door locking device intended to keep a door closed comprising an axis having a first end intended to rest on the ground and a lever system movable in translation relative to the axis.

[0012] The lever system comprises a tab intended to be positioned under the door and a handle provided with a trigger connected to an actuating device for moving the lever system relative to the axis in a direction for blocking the door.

[0013] The actuating device comprises a displacement element held on the axis by return means. The displacement element is pivotable relative to the axis between a rest position in which it is substantially perpendicular to the axis so as to allow free translation of the lever system on the axis and a locking position in which the displacement element is inclined non-perpendicularly relative to the axis to move the lever system relative to the axis.

[0014] The locking position is obtained by actuating the trigger causing a first end of the trigger to pivot towards the displacement element and pressure on an edge of the displacement element to tilt it non-perpendicularly relative to the axis and lock it on the axis. Prolonged actuation of the trigger causes the lever system to translate relative to the axis towards the door locking direction by pushing the first end of the trigger onto the displacement element.

[0015] The lever system includes locking means to lock it relative to the axis and keep the door closed.

[0016] According to the invention, the axis comprises several notches forming a notch. In the locking position, the displacement element is intended to bear on one of the notches to prevent the displacement element from moving back in a direction opposite to the locking direction.

[0017] The invention thus provides a locking device comprising a notched axis which is more effective than those of the prior art. The displacement element does not slide along the axis during the locking of a door, even in the presence of oil, more quickly.

[0018] The notches in effect provide a non-smooth locking surface on which the moving element is more effectively locked.

[0019] Alternatively, the notching is oriented in a direction opposite to the handle.

[0020] In another variant, the notching is oriented towards the handle.

[0021] According to another variant, the notching extends over 20% to 60% of the length of the axis.

[0022] According to another variant, the notching comprises a central zone positioned between half and three-quarters of the length of the axis, from the first end of the axis.

[0023] This arrangement allows the position of the notches to be optimized in the most useful area to minimize manufacturing costs. The notches on the lower part of the axis are not used.

[0024] According to another variant, the axis comprises a second end opposite the first end. The notching is closer to the second end than to the first end of the axis.

[0025] According to another variant, each notch has a depth of between 0.5 mm and 1.5 mm.

[0026] According to another variant, each notch has a width between 1 mm and 3 mm.

[0027] The size of the notches is advantageously small so that the notches are not felt during the locking of the door. The notches must not slow down the moving element or create too much vibration when the moving element passes from one notch to another or increase the effort to move the axis.

[0028] The dimension of the notches is however not too small to allow the movement element to be attached to the notches.

[0029] According to another variant, each notch comprises a first bearing face and a second bearing face forming a tooth angle of between 70° and 95°.

[0030] According to another variant, an angle is formed between a non-notched face of the axis, adjacent to the first bearing face of the notch, and the first bearing face of the notch. The angle is between 60° and 80°.

[0031] Embodiments of the present invention will be described below, by way of non-limiting examples, with reference to the appended figures in which:

[0032] schematically illustrates a side view of the interior of a door locking device at rest, according to the invention;

[0033] schematically illustrates a side view of an axis of the door locking device of the;

[0034] schematically illustrates a detailed view of a notch provided on the axis;

[0035] schematically illustrates a view of a door locking device comprising a magnetic plate supported by a metal bracket.

[0036] Illustrates a door locking device 1 intended to keep a door closed, in the rest position.

[0037] The door locking device 1 comprises an axis 3 having a first end 4 intended to rest on the ground 5 and a lever system 6 movable in translation relative to the axis 3.

[0038] The lever system 6 comprises a tab 7 intended to be positioned under the door and a handle 8 provided with a trigger 9 connected to an actuating device 10 for moving the lever system 6 relative to the axis 3 towards a blocking direction B of the door.

[0039] The actuating device 10 comprises a displacement element 12 held on the axis 3 by return means 13 and which is pivotable relative to the axis 3 between a rest position in which the displacement element 12 is substantially perpendicular to the axis 3 so as to allow free translation of the lever system 6 on the axis 3 and a locking position in which the displacement element 12 is inclined non-perpendicularly relative to the axis 3 to move the lever system 6 relative to the axis 3.

[0040] The locking position is obtained by actuating the trigger 9 causing a first end 14 of the trigger 9 to pivot towards the displacement element 12 and pressure on an edge 39 of the displacement element 12 to tilt it non-perpendicularly relative to the axis 3 and lock it on the axis 3.

[0041] Prolonged actuation of the trigger 9 causes the lever system 6 to translate relative to the axis 3 towards the locking direction B of the door by pushing the first end 14 of the trigger 9 onto the displacement element 12.

[0042] The lever system 6 also includes locking means 11 intended to lock it relative to the axis 3 to keep the door closed.

[0043] The lever system 6 comprises a structure 24 provided with an internal housing 25 crossed by the axis 3 and in which are housed the displacement element 12, the return means 13 and the blocking means 11 which are also crossed by the axis 3.

[0044] The return means 13 comprise a compression spring 15 positioned around the axis 3. The return means 13 advantageously comprise a single compression spring 15.

[0045] The displacement element 12 has an orifice in which the axis 3 slides. The displacement element 12 is held around the axis 3 between a first turn and a second turn of the compression spring 15 (not shown to simplify the).

[0046] The first turn is in contact with a first face 45 of the displacement element 12 and the second turn is in contact with a second face 46 of the displacement element 12.

[0047] The displacement element 12 is positioned in the middle of the compression spring 15. The displacement element 12 can also be offset relative to the middle of the compression spring 15.

[0048] The displacement element 12 has a substantially flat shape. Its orifice is delimited by a rim which engages with the axis 3 when the trigger 9 is actuated.

[0049] Alternatively, the return means 13 may comprise two springs, including a first compression spring and a second compression spring positioned around the axis 3 (not shown). The displacement element 12 is held around the axis 3 between the first and second compression springs.

[0050] Axis 3 has a longitudinal shape with a rectangular cross-section. Other cross-sections are possible, such as square, circular, or hexagonal sections.

[0051] The axis 3 comprises at least one protuberance 41 on one of its faces and forming a stop for the structure 24.

[0052] The locking means 11 comprise a lever 18 and a locking element 17 comprising an orifice in which the axis 3 slides. The locking element 17 is held around the axis 3 between the compression spring 15 and the lever 18 and more precisely between a first end 47 of the compression spring 15 and the lever 18. The compression spring 15 comprises a second end 48 bearing on a lower structural element 49 of the structure 24.

[0053] The blocking element 17 is pivotable relative to the axis 3 between a locking position in which it is inclined non-perpendicularly relative to the axis 3 to block the translation of the lever system 6 when the actuating device 10 is not actuated and an unlocking position when the blocking element 17 is substantially perpendicular to the axis 3 so as to allow the free translation of the lever system 6 towards the blocking direction B of the door when the actuating device 10 is actuated.

[0054] The locking element 17 has a substantially flat shape. Its orifice is delimited by a rim which engages with the axis 3 to lock it when the trigger 9 is not actuated.

[0055] The displacement element 12 and the locking element 17 operate in an antagonistic manner. When one is engaged with the axis 3, the other is released from the axis 3.

[0056] The lever 18 comprises a first end 19 intended to engage on an edge 21 of the locking element 17 to keep it pivoted and locked relative to the axis 3 and a second end 20 opposite the first end 19. The movement of the second end 20 towards the trigger 9 and therefore in a direction opposite to the locking direction B of the door, causes the lever 18 to be released from the edge 21, then the locking element 17 to pivot into the unlocked position.

[0057] The locking element 17 is no longer engaged with the axis 3. The displacement element 12 is engaged with the axis 3. The lever system 6 can then slide along the axis 3 in a direction opposite to the locking direction B of the door towards the first end 4 of the axis 3, allowing the removal of the tab 7 from under the door which is thus unlocked. The door locking device 1 can then be removed.

[0058] The lever 18 comprises a first curved portion 27 bearing against an upper structural element 29 of the structure 24 and a second curved portion 28 bearing against the edge 21 of the locking element 17 to keep it pivoted. The first 27 and the second curved portion 28 are positioned inside the internal housing 25. The second end of the lever 20 is positioned outside the internal housing 25.

[0059] Preferably, the handle 8 comprises a fixed gripping portion 23. The trigger 9 comprises a lug 26 positioned opposite the gripping portion 23. Pivoting the trigger 9 towards a locking position and towards the gripping portion 23 causes the lug 26 to push onto the second end of the lever 20. The first end of the lever 19 then exerts pressure on the edge 21 of the locking element 17 to keep it pivoted non-perpendicular to the axis 3 and to lock the lever system 6 relative to the axis 3.

[0060] The door locking device 1 comprises a locking element 30, as illustrated in the, for holding the trigger 9 in a locking position.

[0061] The locking element 30 is preferably a pin 30, as illustrated in the, comprising a rod 40 inserted into a first orifice 31 provided in a first side wall 33 of the structure 24 of the lever system 6 and into a second orifice 32 provided on a second side wall 34 of the structure 24 of the lever system 6. The rod 40 passes transversely through the internal housing 25 and comes to bear against the first end 14 of the trigger 9 to block its pivoting.

[0062] The first end 4 of the axis 3 comprises a foot 42 provided with an anti-slip means 43 comprising at least one point 44 intended to engage with the ground 5.

[0063] Preferably, the foot 42 comprises four points 44.

[0064] The tips 44 may be cylinders comprising a conical or pyramidal head 51 directed towards the ground 5 or may be nails, for example.

[0065] The spikes 44 are intended to grip the ground 5 to prevent the foot 42 from slipping. The spikes 44 are particularly effective when the ground 5 is made of wood or polymer.

[0066] The foot 42 has a flat shape parallel to the ground 5 when placed thereon. The anti-slip means 43 comprises a flexible pad 50 arranged under the foot 42 to be in contact with the ground 5 and improve grip.

[0067] The flexible pad 50 may be made of foam and be composed of ethylene-propylene-diene monomer (EPMD), for example. The flexible pad 50 is preferably made of polyurethane.

[0068] The head 51 of the tips 44 is housed in the flexible pad 50.

[0069] When the door locking device 1 is not in use and there is no pressure on the foot 42, the head 51 of the spikes 44 remains housed in the flexible pad 50. Thus, children can handle the door locking device 1 without being injured by the spikes 44.

[0070] In contrast, when the door blocking device 1 is used to block a door, pressure is exerted on the flexible pad 50 which crushes and causes the heads 51 to spring out of the spikes so that the heads 51 engage with the floor 5.

[0071] Alternatively (not shown), the foot 42 of the axis 3 comprises cylindrically shaped support elements made of polyurethane resting on the ground to prevent the foot 42 from slipping. The foot 42 may comprise four support elements, for example.

[0072] The axis 3 comprises a second end 35 provided with an orifice 36 intended to receive a half-ring, for example, to limit the movement of the lever system 6 in the locking direction B of the door. In the low position of the foot 42, the half-ring comes into abutment on a portion 56 extending the gripping part 23.

[0073] This provides a simple solution to prevent the axle 3 from protruding from the internal housing 25 of the lever system 6

[0074] As illustrated in the, the first end 14 of the trigger 9 is extended by a curved element 37 like a hook, making it possible to improve the engagement on the displacement element 12.

[0075] The structure 24 forms a rigid frame, preferably made of metal, comprising the upper structural element 29, the lower structural element 49, a rear structural element 53 and a front structural element 54.

[0076] The internal housing 25 is closed by the first side wall 33 and the second side wall 34.

[0077] The trigger 9 is rotatable about an axis 52 arranged in the rear structural element 53 of the structure 24. The trigger 9 can pivot through an angle of 37°, for example, between its rest position and its locking position.

[0078] The gripping part 23 is connected to the tab 7 by a structural element 55 parallel to the axis 3, the gripping part 23 and the tab 7 being perpendicular to the structural element 55.

[0079] The gripping portion 23 and the structural element 55 are fixed to the structure 24.

[0080] According to the invention, the axis 3 comprises several notches 2 (or teeth) forming a notch 16 on the axis 3 and therefore a notched axis, as illustrated in figures 1 and 2.

[0081] The displacement element 12 is intended to bear on one of the notches 2 when it is in its locking position to prevent the displacement element 12 from moving back in a direction opposite to the locking direction B.

[0082] Each notch 2 comprises a first bearing face 60 and a second bearing face 61 forming a non-zero tooth angle A, as illustrated in the. The first bearing face 60 is oriented towards the foot 42 or the first end 4 of the axis 3. The second bearing face 61 is oriented towards the second end 35 of the axis 3.

[0083] Preferably, the tooth angle A is between 70° and 95°. The tooth angle A may be 85°, for example.

[0084] An angle C is formed between a non-notched face 62 of the axis 3, adjacent to the first bearing face 60 of the notch 2, and the second bearing face 61 of the notch 2. The angle C is between 60° and 80°. The angle C is 69°, for example.

[0085] In the example of Figures 1 to 4, the notch 16 is oriented in a direction opposite to the handle 8. The axis 3 comprises a first blocking face 57 which is oriented in a direction opposite to the handle 8, that is to say opposite the trigger 9 and the edge 39 of the displacement element 12. The first blocking face 57 is oriented towards the structural element 55. The notch 16 is positioned on a part of the first blocking face 57 or else on the entire length of the first blocking face 57.

[0086] When the handle 8 is actuated and the displacement element 12 is in the locking position, i.e. inclined non-perpendicularly relative to the axis 3 to move the lever system 6 relative to the axis 3, the first face 45 of the displacement element 12 comes to bear against the first bearing face 60 of the notch 2. When the door locking device 1 is positioned vertically on the ground, the first bearing face 60 of the notch 2 corresponds to an upper face.

[0087] The displacement element 12 is thus blocked by the first bearing face 60 of the notch 2 and cannot slide along the axis 3. The lever system 6 is moved along the axis 3 safely, without risk of slipping.

[0088] Alternatively (not shown), the notch 16 is oriented towards the handle 8. The axis 3 comprises a second locking face 58 which is oriented towards the handle 8, i.e. towards the trigger 9 and the edge 39 of the displacement element 12. The second locking face 58 is opposite the first locking face 57 of the axis 3.

[0089] According to this variant, when the displacement element 12 is in the locking position, that is to say inclined non-perpendicularly relative to the axis 3 to move the lever system 6 relative to the axis 3, the second face 46 of the displacement element 12 comes to bear against the second bearing face 61 of the notch 2. When the door locking device 1 is positioned vertically on the ground, the second bearing face 61 of the notch 2 corresponds to a lower face.

[0090] The displacement element 12 is thus blocked by the second bearing face 61 of the notch 2 and cannot slide along the axis 3. The lever system 6 is moved along the axis 3 without risk of slipping.

[0091] According to another variant (not shown), the axis 3 comprises two opposite notches 16, a first notch 16 positioned on the first locking face 57 and a second notch 16 positioned on the second locking face 58.

[0092] According to this variant, when the displacement element 12 is in the locking position, that is to say inclined non-perpendicularly relative to the axis 3 to move the lever system 6 relative to the axis 3, the first face 45 of the displacement element 12 comes to bear against the first bearing face 60 of the notch 2 located on the first locking face 57. In parallel, the second face 46 of the displacement element 12 comes to bear against the second bearing face 61 of the notch 2 located on the second locking face 58.

[0093] The displacement element 12 is thus doubly blocked by the first bearing face 60 and the second bearing face 61 of the notch 2 and cannot slide along the axis 3. The lever system 6 is moved along the axis 3 even more securely, without risk of slipping.

[0094] Whatever the embodiment, to move the axis 3, the displacement element 12 cooperates either only with the notching 16 or with the notching 16 and a portion of the axis 3 that is not notched (smooth).

[0095] The compression spring 15 surrounds the notch(s) 16.

[0096] In the example of Figures 1 to 4, the axis 3 has a rectangular section. The first locking face 57 and the second locking face 58 are positioned on the narrower sides of the axis 3.

[0097] Axis 3 has a width between 3 mm and 10 mm. The width of axis 3 is 5 mm, for example.

[0098] The notching 16 extends over 20% to 60% of the length of the axis 3, that is to say the length between the first end 4 and the second end 35 of the axis 3.

[0099] The notching 16 may extend along the axis 3 over a length corresponding to approximately 36% of the length of the axis 3, for example.

[0100] Alternatively (not shown), the notching 16 can extend almost over the entire length of the axis 3.

[0101] Thus, the notching 16 makes it possible to ensure better blocking for the displacement element 12 but also for the blocking element 17 of the blocking means 11.

[0102] The locking element 17 comprises a lower bearing surface which is oriented towards the displacement element 12. The lower bearing surface is locked against the second bearing face 61 of the notch 2 by the lever 18 when the lever 18 is in the locking position.

[0103] The notch 16 can comprise between 5 and 60 notches 2, for example. In the example of figures 1 to 4, the notch 16 comprises 41 notches 2.

[0104] According to a variant, the notching 16 comprises a central zone 59 which is positioned between half and three-quarters of the length of the axis 3, from the first end 4 of the axis 3.

[0105] The notch 16 is closer to the second end 35 than to the first end 4 of the axis 3. In other words, the axis 3 comprises more notches 2 on the side of the second end 35 than on the side of the first end 4.

[0106] Each notch 2 has a depth p between 0.5 mm and 1.5 mm. The depth p is 1 mm in the example of figures 1 to 4.

[0107] Each notch 2 has a width l between 1 mm and 3 mm. The width l is 2 mm in the example of figures 1 to 4.

[0108] These dimensions are given for an axis 3 with a length of approximately 225 cm.

[0109] Illustrates a variant in which the door locking device 1 comprises a magnetic plate 63 fixed on an external wall 64 of the door locking device 1.

[0110] The magnetic plate 63 is intended to be attached to a metal plate 65 provided on a support 66 hung on a wall, for example.

[0111] Thus, the support 66 and the door blocking device 1 can advantageously be positioned near a door. In the event of an attack, the door blocking device 1 is quickly and easily accessible for use in blocking the door.

[0112] The metal plate 65 has an L-shaped section and comprises a support wall 67 on which rests a lower wall 68 of the door locking device 1.

[0113] The support wall 67 may comprise an orifice for the passage of the tongue 7 of the lever system 6 and of the axis 3.

[0114] The support 66 includes fixing holes 69 for fixing it to the wall.

[0115] The metal plate 65 is fixed to the support 66 by means of spacers 70.

[0116] Alternatively, the magnetic plate 63 can be fixed to the support 66. The external wall 64 of the door locking device 1 being metallic, it hooks onto the magnetic plate 63.

[0117] The structural element 55 of the lever system 6 comprises a front face intended to bear against a vertical face of the door when the door blocking device 1 blocks the door. The front face extends vertically when the door blocking device 1 is placed on the ground and it blocks the door.

[0118] According to one variant, the front face of the structural element 55 is at least partially covered with a layer of rubber.

[0119] The tab 7 comprises an upper face intended to bear against a lower face of the door positioned below the door when the door blocking device 1 blocks the door. The upper face extends horizontally when the door blocking device 1 is placed on the ground and it blocks the door.

[0120] According to another variant, the upper face of the tab 7 is also covered at least partially with a layer of rubber.

[0121] Alternatively, only the upper face of the tab 7 comprises a layer of rubber.

[0122] The rubber layer can be made of polyurethane, for example. The rubber layer can have a thickness between 0.3 cm and 1 cm, for example.

[0123] The rubber layer(s) prevent the lever system 6 and / or the tongue 7 from sliding along the door when the door is locked by the door locking device 1. The rubber layer(s) have an anti-slip function.

Claims

Door locking device (1) intended to keep a door closed comprising an axis (3) having a first end (4) intended to rest on the ground and a lever system (6) movable in translation relative to the axis (3), the lever system (6) comprising a tongue (7) intended to be positioned under the door (2) and a handle (8) provided with a trigger (9) connected to an actuating device (10) for moving the lever system (6) relative to the axis (3) towards a direction (B) for locking the door (2), the actuating device (10) comprising a displacement element (12) held on the axis (3) by return means (13),the displacement element (12) being pivotable relative to the axis (3) between a rest position in which it is substantially perpendicular to the axis (3) so as to allow free translation of the lever system (6) on the axis (3) and a locking position in which the displacement element (12) is inclined non-perpendicularly relative to the axis (3) to move the lever system (6) relative to the axis (3), the locking position being obtained by actuation of the trigger (9) causing the pivoting of a first end (14) of the trigger (9) towards the displacement element (12) and pressure on an edge (39) of the displacement element (12) to tilt it non-perpendicularly relative to the axis (3) and lock it on the axis (3),prolonged actuation of the trigger (9) causing the translation of the lever system (6) relative to the axis (3) towards the locking direction (B) of the door (2) by the thrust of the first end (14) of the trigger (9) on the displacement element (12), the lever system (6) comprising locking means (11) for locking it relative to the axis (3) and keeping the door (2) closed, characterized in that the axis (3) comprises several notches (2) forming a notch (16), the displacement element (12) being intended to bear on one of the notches (2) when the displacement element (12) is in the locking position., Door locking device (1) according to claim 1, characterized in that the notch (16) is oriented in a direction opposite to the handle (8). Door locking device (1) according to any one of claims 1 or 2, characterized in that the notch (16) is oriented towards the handle (8). Door locking device (1) according to any one of claims 1 to 3, characterized in that the notching (16) extends over 20% to 60% of the length of the axis (3). Door locking device (1) according to any one of claims 1 to 4, characterized in that the notching (16) comprises a central zone (59) positioned between half and three quarters of the length of the axis (3), from the first end (4) of the axis (3). Door locking device (1) according to claim 5, characterized in that the axis (3) comprises a second end (35) opposite the first end (4), the notching (16) being closer to the second end (35) than to the first end (4) of the axis (3). Door locking device (1) according to any one of claims 1 to 6, characterized in that each notch (2) has a depth p of between 0.5 mm and 1.5 mm. Door locking device (1) according to any one of claims 1 to 7, characterized in that each notch (2) has a width l of between 1 mm and 3 mm. Door locking device (1) according to any one of claims 1 to 8, characterized in that each notch (2) comprises a first bearing face (60) and a second bearing face (61) forming a tooth angle A of between 70° and 95°. Door locking device (1) according to claim 9, characterized in that an angle C is formed between a non-notched face (62) of the axis (3), adjacent to the first bearing face (60) of the notch (2), and the first bearing face (60) of the notch (2), the angle C being between 60° and 80°.

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