EP3597842B1 - Safety lock with coded key - Google Patents

Description

The present invention relates to a safety lock adapted to be controlled with a key having a coded bit.

One field of application envisaged is in particular, but not exclusively, that of padlocks.

Known safety locks comprise a cylinder formed of coded washers applied successively against one another so as to form a key passageway opening into the two opposite ends of the cylinder. They also include a trainer installed at one end of the cylinder. The driver comprises a central part projecting axially which extends in the extension of the key passage path. It also comprises a circular edge having two notches adapted to form support stops. The central part of the driver is split so as to be able to receive the key bit of the key when the latter is engaged in the passage way. The bit then engages in rotation with the central part of the driver.

In addition, the safety lock comprises two eccentric keys pivotally mounted on the end of the cylinder in relation to which the driver is adjusted. These keys are connected to rods which extend along the cylinder and which are provided with extended returns in the key passage path. The keys are pivotally movable in a plane substantially perpendicular to the axis of the cylinder. Thus, the keys have ends which come into engagement against the bearing stops when they extend into the notches of the circular edge in order to be able to block the driver in rotation. When the bit, integral in rotation with the driver, is authorized to be driven in rotation inside the cylinder of coded washers, it causes in sequences, first the spacing of the keys which release the notches, thanks to the cooperation of the bit with the return of the rods, then the rotation of the driver which acts for example on the locking mechanism of a padlock.

With the aim of reinforcing the inviolability of this type of lock, it was imagined to differentiate the keys and to form a notch in notch. So, one of the keys has a free return end forming a claw capable of engaging in the notch in a crenellated fashion. The other key then forms a stand against the stop of the other notch. Also, the two keys rotate simultaneously in two opposite directions of rotation. In this way, the lock picking is more difficult, since the driver is blocked in both directions of rotation. We can refer to the document FR 2 757 557 , which describes such a type of safety lock.

Nevertheless, the picking of such a lock is possible and, moreover, the number of parts necessary for its implementation is large and thus increases the cost of manufacture.

Also, a problem which arises and which the present invention aims to solve is to provide a tamper-proof safety lock which can be produced at an advantageous cost.

For this purpose, a safety lock is proposed which is suitable for being ordered with a key having a coded bit. Said safety lock comprises: a cylinder of coded washers having two opposite ends and a passageway opening into said two ends; a driver rotatably mounted at one of said two ends, said driver comprising a central part extending facing said passageway and a circular edge having two opposite notches, said bit being adapted to be engaged in said passageway at through the other of said ends to engage with said central portion; and, two eccentric keys pivotally mounted on said one of said ends of said cylinder so as to be able to engage respectively in said notches so as to block said driver in rotation, said bit being adapted to cause sequentially, the separation of said keys to release said notches. , and the rotation of said driver. Said circular edge having two wafer portions offset axially, said notches are made in one of said wafer portions, while the other of said wafer portions also has a notch opening into one of said notches; and one of said keys is equipped with a lateral stud adapted to engage in said notch when the key extends into said one of said notches.

Thus, a characteristic of the invention resides in the implementation, of a notch in the other portion of the edge of the circular edge of the driver, on the one hand, the notch opening laterally into the corresponding notch. , and a lateral stud on one of said keys so that the lateral stud engages in the notch when the key extends into the corresponding notch. In this way, the free end of the key comes into abutment against the bearing stop formed by the notch, when the driver tends to be rotated in one direction of rotation, the key then forming a stand, while the stud comes to rest against one of the sides of the notch, when the driver tends to be rotated in the opposite direction. Consequently, when the keys engage in the notches, the driver is locked in rotation in both directions and offers no possibility of rotational play which could facilitate picking.

Preferably, the other of said wafer portions also has another notch opening into the other of said notches, and the other of said keys is equipped with another lateral stud able to engage in said other notch when said other of said keys. keys extend into said other of said notches. In other words, said circular edge having two wafer portions offset axially, said notches are made in one of said wafer portions, while the other of said wafer portions also has two notches opening respectively into said notches and said keys are respectively equipped with a lateral stud adapted to engage in said notches when the keys come to extend into said notches. Thus, each of the keys is equipped with a stud while another portion of a slice has two notches intended to receive the studs respectively. In this way, each of the keys allows the rotational locking of the driver in both directions of rotation. The picking of the lock object of the invention is then made even more difficult. In addition, and advantageously, the keys are identical and they are installed diametrically opposed to the end of the cylinder. They are then able to be driven in pivoting in opposite directions of rotation in order to release the driver or to come into engagement with it. Also, thanks to the implementation of identical keys, the number of different parts to be produced to mount the safety lock object of the invention is reduced.

According to a particularly advantageous embodiment of the invention, said notches extend substantially in a V, each forming a bearing stop. The V-shaped notches have a first flank extending substantially along a fraction of a radius and a second flank substantially perpendicular. The first flank then forms the support stop. Preferably, the two V-shaped notches are antisymmetrical to each other with respect to an axial plane of the driver as will be explained in more detail in the remainder of the description.

Also, according to a particularly advantageous implementation characteristic, said keys each have a free end adapted to come to bear against said bearing stops. The free end of the keys is preferably rounded so as to cooperate with the bottom, itself rounded, of the V-shaped notches.

In addition, said notch preferably extends in a mean direction away from the center of said circular edge so as to form a flank forming a hook. In other words, the mean direction of the notch is inclined with respect to a radius of the driver coming to intersect the notch. In this way, and as will be explained in more detail in the remainder of the description, one of the sides of the notch then forms a hook in which the stud engages. Thus, in certain circumstances, which will be described in detail, the key is locked in pivoting. Advantageously, said flank forming a hook is opposite said corresponding stop. In this way, when the driver is forced to rotate in one direction, the stud then engages in the flank forming a hook, and the corresponding key is locked in pivoting. When the driver is forced to rotate in the opposite direction, the free end of the key comes into abutment against the support stop, and prohibits its rotation. As will be explained below, the flank forming the hook has a double curvature making it possible to accentuate the shape of the hook.

Also, and advantageously, said keys are respectively mounted on two controllable rods extending along said cylinder in two diametrically opposed positions. Keys are integral respectively in rotation of the two controllable rods. These each have a return which extends through the coded washers so that the bit can cooperate with the returns to control the keys in pivoting via the rods.

Preferably, said driver has a crank pin oriented opposite said cylinder. The crankpin is then adapted to cooperate with an element movable in translation, for example a bolt, precisely to drive it in translation as will be explained below.

According to another object, and in accordance with a first variant embodiment, the present invention relates to a safety key box comprising a parallelepipedal casing and a hinged door for closing said casing, the key box comprising a safety lock as described. above and said coach is equipped with a threshing cam for locking said hinged door on said parallelepiped housing.

According to yet another object and in accordance with a second variant embodiment, the present invention relates to a safety padlock comprising: a T-box comprising a cylindrical housing surmounted by a transverse housing having two opposite ends; a hoop pivotally mounted on one of said ends of said transverse housing, said hoop having a free hooked end adapted to extend into the other of said ends of said transverse housing; and a longitudinal bolt slidably mounted within said transverse housing to engage said free end hooked in said other of said ends. The safety padlock comprises a safety lock as described above, said safety lock being installed inside said cylindrical housing so that said driver cooperates with said longitudinal bolt.

• la Figure 1 est une vue schématique en perspective d'une serrure de sûreté conforme à l'invention ;
• la Figure 2 est une vue schématique en perspective d'un élément de la serrure illustrée sur la Figure 1 ;
• la Figure 3 est une vue schématique en perspective d'autres éléments de la serrure illustrée sur la Figure 1 ;
• la Figure 4 est une vue schématique d'une combinaison d'éléments de la serrure représentée sur la Figure 1 ;
• la Figure 5 est une vue schématique d'une autre combinaison d'éléments de la serrure représentée sur la Figure 1 ;
• la Figure 6 est une vue schématique en transparence selon la flèche VI de la serrure de sûreté illustrée sur la Figure 1 ; et,
• la Figure 7 est une vue schématique en perspective d'un mode de mise en œuvre de la serrure représentée sur la Figure 1.

Other features and advantages of the invention will emerge on reading the description given below of particular embodiments of the invention, given as an indication but not as a limitation, with reference to the appended drawings in which:

• the Figure 1 is a schematic perspective view of a safety lock according to the invention;
• the Figure 2 is a schematic perspective view of an element of the lock illustrated in Figure 1 ;
• the Figure 3 is a schematic perspective view of other elements of the lock shown in Figure Figure 1 ;
• the Figure 4 is a schematic view of a combination of elements of the lock shown in Figure 1 ;
• the Figure 5 is a schematic view of another combination of elements of the lock shown in Figure 1 ;
• the Figure 6 is a schematic view in transparency according to arrow VI of the safety lock illustrated on the Figure 1 ; and,
• the Figure 7 is a schematic perspective view of an embodiment of the lock shown in FIG. Figure 1 .

The Figure 1 shows a safety lock 10 in which is inserted a key 12. The safety lock 10 comprises a cylinder 14 of axis of symmetry C, which cylinder 14 comprises a plurality of coded washers 16 applied successively against each other to form a filter as will be explained below. The cylinder 14 has a first end 18 opposite to a second end 20. The lock 10 also comprises a driver 22 with an axis of symmetry S rotatably mounted at the second end 20 of the cylinder 14 and coaxially with the latter. The driver 22 is guided in rotation, in particular by means of a cylindrical guide portion 24 through a housing, not shown, which also accommodates the cylinder 14. The driver 22 has a crank pin 26 opposite the cylinder 24, and a circular border 28 towards the cylinder 24. Before detailing the driver 22, we will refer to the Figure 3 showing the second end 20 of the cylinder 14 precisely freed from the driver 22, in order to better describe the elements that it hides on the Figure 1 .

So on the Figure 3 two arched keys appear, a first key 30 diametrically opposed to a second key 32. The keys 30, 32 are respectively secured to a control rod 34, 36 which extend axially along the cylinder 14. The two keys 30, 32 are identical and they are thus respectively movable in pivoting about the axes A and B of the control rods 34, 36, between a close position one from the other and a splayed position. It will be observed that the keys 30, 32 are arcuate in the same direction of curvature as that of the cylinder 14. And in addition, when the keys 30, 32 move away from one another, they pivot in the directions of rotation. opposites.

The, first 30 and second 32 keys respectively have a first free end 38 and a second free end 40. The free ends 38, 40 have a substantially cylindrical shape and they are thus rounded. And they are respectively provided with a first stud 42 and a second stud 44. The studs 42, 44 extend laterally with respect to the keys 30, 32 and in an axial direction of the cylinder 14. The studs 42, 44 are respectively located at a predetermined distance from the free ends 38, 40. This distance is for example close to a quarter of the length of the keys 30, 32. The keys 30, 32 themselves have a length substantially close to the radius of the cylinder 14.

Also, the cylinder 14, at its second end 20, comprises an end stop washer 46 having in its center an axial bore 48 making it possible to form a bearing as will be explained below. The terminal stop washer 46 has no coding function but it also makes it possible, in addition to its functions of guiding in rotation, to keep the coded washers 16 in axial bearing against one another.

We will now refer to the Figure 2 showing in more detail the driver 22. It comprises a central portion 50 which projects from a shoulder 52. The driver 22 also comprises a circular edge 54 defining two portions of slices offset axially one of the another, a first proximal slice portion 56 defining the shoulder 52, and a second distal slice portion 58.

The central part 50 of the driver 22 has a casing of cylindrical symmetry with a circular base capable of being engaged inside the axial bore 48 made in the end stop washer 46 shown in FIG. Figure 3 . The driver 22 has a blind axial orifice 60 and opening axially into the central part 50. Also, the central part 50 has a transverse slot 62 extending in a transverse direction T perpendicular to the axis of symmetry of the driver 22. . Thus, the slit transverse 62 has a free intersection with the blind axial orifice 60 and thus defines four bearing surfaces 64, 66; 68, 70 two by two facing each other. The following description will be explained in more detail with reference to Figure 5 the function of this transverse slit 62.

Also, the coach 22 as illustrated on the Figure 2 has two V-notches, a first 72, and a second 74, antisymmetric to each other with respect to an axial plane; the V-notches being made in the first proximal slice portion 56 of the circular rim 54. The V-notches 72, 74 then define a first stop 76 and a second stop 78 substantially diametrically opposed and extending in an axial plane. The two V-shaped notches 72, 74 respectively define substantially triangular spaces in the thickness of the first portion of the proximal slice 56 and respectively delimited by the stops 76, 78 and adjacent sides 80, 82.

In addition, the driver 22 has two notches, a first notch 84, and a second notch 86 formed themselves in the second portion of slice 58. The notches 84, 86 are diametrically opposed and they open respectively and laterally into the notches in V 72, 74. In addition, the notches 84, 86 are antisymmetrical to each other with respect to an axial plane. Also, they extend in a mean direction away from the center of symmetry S of the driver 22, so as to form an edge extended by a flank forming a hook 88 and an opposite obtuse edge 90. In addition, the bottom of the notches 84 , 86 are machined in the counterclockwise direction so as to obtain even more pronounced hook edges 88. Furthermore, the edges forming the hook 88 are rounded so as to obtain a notch side with double curvature.

It will be observed that the edges forming a hook 88 extend respectively and in an axially offset manner, opposite the first 76 and second 78 stops.

We will now refer to the Figure 4 precisely showing the keys 30, 32 respectively extended in the notches 74, 72 the free ends 40,38, respectively bearing against the stops 76, 78. This Figure also shows the control rods 34, 36 intended for order the keys 30, 32 to pivot. They appear here because a plurality of coded washers 16 have been removed for clarity of the drawing. Also, the cylinder 14 defines a key passage path 92 which extends axially as far as the central part 50 of the driver 22. This key passage path 92 axially accommodates the key 12 as illustrated in FIG. Figure 5 on which coded washers 16 have also been removed from the cylinder 14, in particular on the side of the second end 20. Thus, the bit 94 of the key 12 appears, which, engaged in the key passage path 92, engages the slot transverse 62 of the central part 50 of the driver 22. Thus, in this position, the bit 94 of the key 12 is integral in rotation with the driver 22. It will be observed on this Figure 5 , that one 32 of the keys extends into the first V-shaped notch 72, while its stud 44, the second, extends inside the first notch 84. It is understood that behind In the Figure, the other 30 of the keys extends into the second V-notch 74, while its stud 42 extends from it, inside the second notch 86.

We then find this situation on the Figure 6 , in rear view of the safety lock 10, and in transparency through the driver 22. Thus, we find the two keys 30, 32 close to each other so as to extend respectively into the notches V-shaped 74, 72. In addition, their respective free ends 38, 40 are respectively in abutment against the second 78 and first 76 abutments. It is thus understood that the driver 22 is locked in rotation in the direction of clockwise at two diametrically opposed points of the driver 22. Indeed, the keys 30, 32 thus form a crutch.

In addition, we find the two pins 42, 44 respectively in the notches 86, 84. In this way, when the driver 22 is forced to rotate, conversely, in the trigonometric direction, the pins 42, 44 s' recess in the edges forming a hook 88 of the notches 84, 86, which not only blocks the rotation of the driver 22 in the counterclockwise direction, but also prevents the separation of the keys 30, 32 from each other. Indeed, the pins 42, 44 of the keys 30, 32 are engaged behind the edges forming hook 88.

Consequently, such a safety lock 10 is difficult to violate since, in order to pick it, it is necessary not only to force driving the driver 22 in rotation but also simultaneously raising the two keys 30, 32, it being observed that their movement is prohibited when the driver 22 is forced in the counterclockwise direction, and is difficult when the driver 22 is forced in the opposite direction, clockwise.

Of course, when the bit 94 of the key 12 corresponding to the safety lock 10 is engaged in the passageway 92 until it engages with the driver 22, the rotation of the key 12 and hence of the bit 94 is authorized, and it causes sequentially, the pivoting of the keys 30, 32 about the axes A, B of the control rods 34, 36, and consequently the separation of the keys 30, 32 from one another. The keys 30, 32 then release the two V-notches 74, 72 while the corresponding pins 42, 44, release the notches 86, 84. In this way, the driver 22 is released, and it can be rotated in rotation. continuing the rotation of key 12 and key bit 94.

Thus, returning to the Figure 1 it will be understood that the crankpin 26 can be driven in rotation around the axis of symmetry C of the cylinder 14. The crankpin 26 can for example cause the translation of a locking member.

It can in particular cause the translation of a longitudinal bolt 96 of a safety padlock 98 as shown in the figure. Figure 7 . The safety padlock 98 comprises a T-box 100 having a cylindrical housing 102 having an open bottom 101 and a transverse housing 104 which it surmounts. The transverse housing 104 has two opposite ends, one 106 forms a yoke, while the other 108 has a receiving housing 110. Also, the safety padlock 98 comprises a hoop 112 mounted in the yoke of the end 106. to be able to rotate. The hoop 112 has a free hooked end 114 intended to extend inside the receiving housing 110. In addition, the transverse housing 104 receives the longitudinal bolt 96, which has a hooking end 116 coming from s 'extend at least partially into the receiving housing 110 in order to be able to cooperate with the free hooked end 114 of the arch 112 and thus imprison it. The longitudinal bolt 96 is slidably recalled by a spring 118 opposite its hooking end 116 in order to be able to be driven by force towards the reception housing 110. In addition, the longitudinal bolt 96 has a central slot 120.

And the safety padlock 98 then comprises a safety lock as described above, housed inside the cylindrical housing 102, so that the crankpin 26 'protrudes into the central slot 120 of the longitudinal bolt 96. , while the first end 18 'of cylinder 14' extends opposite the open bottom 101. The transverse housing 104 is closed by means of a sealed cover and the open bottom 101 is then accessible by means of a key 12 'in order to be able to unlock the hoop 112. In fact, the rotation of the crank pin 26' allows the longitudinal bolt 96 to be driven in translation towards the end 106 and thus to release the free hooked end 114 to allow the pivoting of the arch 112.

The safety lock which is the subject of the invention can also be used to lock the door of furniture or of any box, for example a key box. It then comprises a parallelepipedal casing and a hinged door to close said casing. A safety lock as described above is then installed on the hinged door and the trainer is equipped with a threshing cam to lock the hinged door on said parallelepiped housing.

Claims (10)

1. A safety lock (10) adapted to be operated with a key (12) having a coded bit (94), said safety lock including:

   a cylinder (14) made of coded discs (16) having two opposite ends (18, 20) and a passage way (92) opening within said two ends (18, 20);

   a driving member (22) rotatingly mounted to the one (20) of said two ends, said driving member comprising a central part (50) extending in front of said passage way (92) and a circular edge (54) having two opposite notches (72, 74), said bit (94) being adapted to be engaged into said passage way (92) through the other (18) of said ends to engage said central part (50);

   two offset wedges (30, 32) swivellingly mounted on said one of said ends (20) of said cylinder (14) to be able to engage said notches (74, 72) respectively, in order to rotatingly block said driving member (22), said bit (94) being adapted to sequentially cause the spacing apart of said wedges (30, 32) in order to release said notches (74, 72), and the rotation of said driving member (22);

   characterized in that, said circular edge (54) having two axially shifted slice portions (56, 58), said notches (74, 72) are provided in one (56) of said slice portions, while the other (58) of said slice portions is further provided with a notch (84) opening within one of said notches (72);
   and in that one of said wedges (32) is provided with a side nipple (44) intended to engage said notch (84) when the wedge (32) extends within said one of said notches (72).
2. The safety lock according to claim 1, characterized in that the other of said slice portions (58) is further provided with another notch (86) opening within the other of said notches (74), and in that the other of said wedges (30) is provided with another side nipple (42) in order to engage said another notch (86) when said another of said wedges (30) extends within said another of said notches (74).
3. The safety lock according to claim 1 or 2, characterized in that said notches (74, 72) extend in a substantially V-shape by forming each one a resting stop (78, 76).
4. The safety lock according to claim 3, characterized in that said wedges (30, 32) have each one a free end (38, 40) adapted to bear against said resting stops (78, 76).
5. The safety lock according to any of claims 1 to 4, characterized in that said notch (84, 86) extends according to a middle direction away from the center of said circular edge (54) so as to form a hook forming flank (88).
6. The safety lock according to claims 3 and 5 or 4 and 5, characterized in that said hook forming flank (88) is opposite to said corresponding stop (76, 78).
7. The safety lock according to any of claims 1 to 6, characterized in that said wedges (30, 32) are mounted respectively on two controllable rods (34, 36) extending along said cylinder (14) within two diametrically opposite positions.
8. The safety lock according to any of claims 1 to 7, characterized in that said driving member (22) has a crank pin (26) directed at the opposite of said cylinder (14).
9. A safety key box comprising a parallelepipedic housing and a hinged door to close said housing, characterized in that it comprises a safety lock according to any of claims 1 to 7, and in that said driving member is provided with a hinged cam to lock said hinged door on said parallelepipedic housing.
10. A safety padlock (98) comprising:

    a T-shape case (100) including a cylindrical housing (102) surmounted by a transversal housing (104) having two opposite ends (106, 108);

    a hoop (112) swivellingly mounted on one of said ends (106) of said transversal housing (104), said hoop (112) having a free end (114) in a hook form adapted to extend into the other of said ends (108) of said transversal housing (104);

    a longitudinal bolt (96) slidingly mounted within said transversal housing (104) to engage with said free end (114) as a hook into said another of said ends (108);

    characterized in that it comprises a safety lock according to any of claims 1 to 8, said safety lock being installed within said cylindrical housing (102) so that said driving member cooperates with said longitudinal bolt (96).

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