EP1359271A1 - Mechanical box locking device - Google Patents

Abstract

Mechanical locking device for the door (1) of a till comprises a lock, accessible from the external face of the door and a cam (2), which is integral with the lock, and activates a locking plate (4, 4'). The cam extends in a plane parallel to the door and has drive means that act on the locking plate. The latter is mounted on a plurality of sliding supports (5, 5') that are integral with the door.

Description

The present invention relates to a mechanical door locking device a case that can contain values.

A box is a robust construction, one side of which includes a door lockable articulated around a hinge. The door is locked by means of a key turning in a lock fixed on the external face of the door. The key activates the axis of the lock which is linked to a sliding element called plate, located on the inside of the door. This plate fits into a housing opposite the plate disposed on the edge of the housing surrounding the door.

Such a case is used mainly in the field of telephony public and vending machines where coins are processed by a coin and collected in the cash register. It should nevertheless be noted that this invention is not limited to this application but also relates to all types of reinforced boxes such as chests.

The invention focuses more particularly on the mechanism which connects the lock to the plate (s). When closing the door, the lock actuates by rotation of the key one or more plates which move on supports fixed on the door to be housed for example in a groove integral with the housing. Movement rotary axis of the lock is converted into translational movement of plates by means of a lever fixed to the axis of the lock. The lever operates the movement of the plates in the direction of corresponding grooves from the edge of the housing. Turning the key in the opposite direction will open the door, plates withdrawing from the grooves by translation in the opposite direction to that of closing.

All devices that use coins as payment payphones or vending machines have a cash register where accepted coins are collected. These devices being located in the majority of cases outside and on the public highway, they are exposed to various acts of vandalism. More specifically, the body is often fractured and emptied of its content of coins. In order to resist these fraudulent openings, the body box, the door and its locking mechanism are reinforced and made of resistant materials such as special alloys based on steel.

• Perçage dans le corps de la serrure à côté de l'orifice servant à la clé permet un accès au levier reliant les plaques à l'axe de la serrure afin de le manoeuvrer au moyen d'un tournevis par exemple pour forcer sa rotation.
• Perçage effectué dans une des faces latérales du boítier à proximité du bord de la porte à la hauteur de la serrure. Le trou ainsi percé permet d'agir sur le levier actionnant les plaques en exerçant une force suffisante sur la goupille de manière à débloquer et faire tourner le levier.

Despite this solid construction, several cases of break-in by drilling the door or the box of the box were noted:

• Drilling in the body of the lock next to the orifice used for the key allows access to the lever connecting the plates to the axis of the lock in order to operate it using a screwdriver for example to force its rotation.
• Drilling in one of the side faces of the case near the edge of the door at the height of the lock. The hole thus drilled makes it possible to act on the lever actuating the plates by exerting sufficient force on the pin so as to unlock and rotate the lever.

The prior art reports an embodiment of a cash door lock which includes a key lock, two sliding plates on supports arranged on both sides of the lock in a plane parallel to that of the door, a lever called cam, fixed on the axis of the lock provided with a pin at each end. These pins are engaged in a slide forming an elongated hole in each plates. The elongated lever is comparable to a bridge between the plates on each side of the lock, the middle of which is maintained at the axis of the lock at by means of a nut. The pins attached to each end slide in the corresponding holes in each plate. This known locking device is illustrated below in the figures.

The rotation in one direction of the axis of the lock by means of the key causes a translation of the plates towards the edge of the door to close it. A rotation of the same axis in the opposite direction causing a translation of the plates towards the lock for opening.

In the case of this embodiment, a bore in the body of the lock or in its immediate vicinity allows access to the cam connecting the two plates. So he is possible to exert sufficient force by means of a bar on the edge of the cam to rotate it.

A hole on one side of the body gives access to the part of the pin protruding from the cam before its engagement in the corresponding slide of the plate. In this case a force exerted on the pin also makes it possible to force the rotation of the cam as in the previous case, and therefore the axis of the lock.

The document CH401740 describes a system for closing and locking the door to a safe. The door is opened and closed by means of a rotating disc with handles located on the outside of the door actuating a locking plate via an eccentric cam. A key lock placed in the center of the rotating disc activates a stop plate fitted with a pin to lock the eccentric cam after closing Door. This relatively complex locking system requires the operation of two elements respectively the key and the disc to unlock and open or close and lock the door.

The object of the present invention is to provide a simple locking device of a cash register door, the elements of which have a structure and a layout preventing the door from opening, especially after drilling the housing or cash door.

This object is achieved by a mechanical device for locking the door of a box. located on the inside of this door with an accessible key lock from the outside of the door, a cam actuating at least one plate locking and integral with the axis of the lock, characterized in that this cam generally extends parallel to the plane of the door at a minimum distance necessary for mechanical play, said cam comprises at least one part drive bearing on the edge of the locking plate, the latter being mounted on a plurality of sliding supports integral with the door and extends either on the same plane as the cam, or on a plane greater than the plane of said cam.

According to a first variant, the cam is fixed to the axis of the lock parallel to the door plan. The locking plate is mounted on sliding supports fixed to the door, the height of these keeps the plate locking in the plane of the cam. In addition, a spring connects the plate locking with a pin fixed to the door for example.

The rotation of the axis of the lock made using the key causes a rotation of the cam whose shape allows it to rest on the edge of the plate locking. A force is thus exerted on the locking plate causing a translational movement towards the edges of the body of the box ensuring the door lock. The locking plate is blocked by the cam; in this position, the spring is tensioned.

A rotation of the cam in the opposite direction releases the locking plate. It emerges from the edges of the case under which it was fitted by a translational movement towards the lock due to the traction exerted by the spring. This removal of the locking plate allows the door to be opened. checkout.

According to a second variant, the locking plate is mounted on supports sliding fixed to the door, the height of these keeps the plate locking above the cam by partially covering it. A pin, attached to the cam and projecting from the face opposite to that opposite the door, is engaged in an elongated opening in the locking plate. This opening serves as a slide for the pin which can slide there freely.

The rotation of the axis of the lock made using the key causes a rotation of the cam whose pin engaged in the locking plate drives the latter in a translational movement.

A preferred variant of the invention is applied to a door of smaller thickness than the length of the lock body. In this case the cam has, in the area central, a cover which completely surrounds the body of the lock to protect it. The axis of the lock is fixed by a nut on the upper face of the cover which is integral with the cam.

The advantages of this device lie in the protection against break-ins by drilling the door or the box of the box.

A hole in the body of the lock leads to the upper side of the cover in the vicinity of the lock fixing nut. Such a hole offers no grip or fulcrum capable of forcing the rotation of the cam in order to open the door.

Drilling through the door, next to the lock, ends on the cam where a force which would allow its rotation is not applicable, for lack of a fulcrum, in particular to because of the short distance between the cam and the door.

The generally elliptical or circular shape of the cam has no points to support a bar passing through a hole in the door as the edges of the cam of elongated polygonal shape known from the prior art.

The lateral drilling does not give access to the pin as in the case cited more high because the latter is protected by the slide of the locking plate in which it is engaged. In addition, the pin does not protrude from the face top of the locking plate, it remains inaccessible with a tool such than a bar or a lever.

In case the cam and the locking plates are located in the same plan, it is also not possible to access the cam from one of the sides of the body to exert a force there because the cam is masked by the locking plates.

• la figure 1 illustre une porte de caisse munie d'un dispositif de verrouillage selon l'état de la technique le plus proche.
• la figure 2 représente une vue en coupe du dispositif de verrouillage de la figure 1
• la figure 3 illustre une première variante où la came et les plaques de verrouillage sont dans le même plan
• la figure 4 représente une vue en coupe de la figure 3
• la figure 5 représente une vue en coupe de la variante de la figure 3 avec une porte épaisse
• La figure 6 représente une vue générale de la caisse
• la figure 7 illustre une seconde variante où les plaques de verrouillage sont parallèles et au-dessus de la came.
• la figure 8 représente une vue en coupe de la figure 7
• la figure 9 représente une vue en coupe de la variante de la figure 7 avec une porte épaisse
• la figure 10 illustre une variante où la came comporte deux goupilles supplémentaires, les plaques de verrouillage étant en position verrouillée.
• la figure 11 illustre la variante de la figure 10 avec les plaques de verrouillage en position déverrouillée.
• la figure 12 illustre une variante où les plaques de verrouillages sont retenues par des lames de ressort solidaire de la porte en position verrouillée.
• la figure 13 illustre la variante de la figure 12 avec les plaques de verrouillage en position déverrouillée.

The invention will be better understood thanks to the detailed description which follows and which refers to the attached drawings which are given by way of non-limiting example, namely:

• Figure 1 illustrates a cash door with a locking device according to the closest prior art.
• 2 shows a sectional view of the locking device of Figure 1
• Figure 3 illustrates a first variant where the cam and the locking plates are in the same plane
• Figure 4 shows a sectional view of Figure 3
• 5 shows a sectional view of the variant of Figure 3 with a thick door
• Figure 6 shows a general view of the body
• Figure 7 illustrates a second variant where the locking plates are parallel and above the cam.
• Figure 8 shows a sectional view of Figure 7
• Figure 9 shows a sectional view of the variant of Figure 7 with a thick door
• FIG. 10 illustrates a variant where the cam has two additional pins, the locking plates being in the locked position.
• Figure 11 illustrates the variant of Figure 10 with the locking plates in the unlocked position.
• FIG. 12 illustrates a variant in which the locking plates are retained by spring blades secured to the door in the locked position.
• Figure 13 illustrates the variant of Figure 12 with the locking plates in the unlocked position.

Figure 1 and Figure 2 which is a section along A-A show the device locking, according to the prior art, mounted on the internal face of a cash door (1). This device comprises two locking plates (4, 4 ') arranged on each side of the lock (8) on sliding supports (5, 5 ') parallel to the plane of the door. An elongated cam (2) integral with the axis of the lock (7) is located in a parallel plane above the locking plates (4, 4 '). These last are (4, 4 ') each provided with a slide (9, 9') where a pin (3, 3 ') is engaged which is fixed to each end of the cam (2). A rotation of the cam (2) causes a translational movement of the locking plates (4, 4 ') generated by the push of the pins (3, 3 ') which slide in their slide (9, 9').

Figure 6 shows a box whose door (1) is fitted with the locking device (10) according to the invention. The door (1) has a hinge (13) along the side inferior. When locking, the plates (4, 4 ') located to the left and right of the lock deviates so as to project from the other three sides of the door (1) to be housed in corresponding grooves located in the edges (14) of the opening of the housing (11).

Inside the housing (11) is a removable box (12) used to collect some coins. This box once full is replaced by a vacuum which requires regular opening and closing of the door (1) of the box.

Figure 3 and Figure 4 which is a section along A-A show a first variant of the locking device, according to the invention, mounted on the internal face of a door body (1). The cam (2) and the locking plates (4, 4 ') are located in the same plane parallel to the door (1) and at a distance from it necessary for the game mechanical.

In a first embodiment, the body of the lock has a length greater than the thickness of the door. In order to keep the cam (2) at a minimum distance by relative to the plane of the door (1), the fixing to the axis of the lock (7) is carried out by through a cover (6). The latter, generally cylindrical (6), surrounds the body of the lock (8) and its base is welded to the cam (2). The upper side of the hood is crossed by the axis of the lock (7) which is fixed there by a nut.

The locking plates (4, 4 ') have elongated holes forming slides. The plates (4, 4 ') are placed on supports (5, 5') each made up by a spacer and a screw provided with a nut which crosses the spacer and the slide in order to maintain their position parallel to the door at a minimum distance allowing mechanical play. Springs (30, 30 ') connect the plates locking to allow them to be removed when the door is unlocked.

Figures 3 and 4 show the configuration of the device when the door (1) is locked. Indeed, the locking plates (4, 4 ') protrude from the side edges of the door (1) in order to fit into the corresponding grooves of the body of the case. The lower edge of the door (1) is provided with a hinge.

A rotation of the key in the lock (8) turns the cam (2) so as to release the locking plates (4, 4 ') which no longer rest on the edges of the cam (in dotted on the figure). The plates (4, 4 ') leave the grooves of the housing by a translational movement towards the lock (8) actuated by the springs (30, 30 ') tensioned before locking. (arrows P, P ')

A second embodiment illustrated in FIG. 5 is applied to a door (1) of thickness equal to the length of the body of the lock (8) so as to drown it entirely in the thickness of the door (1) leaving only the axis (7) protruding. The cam (2) is thus directly fixed to this axis parallel to the plane of the door (1) to a minimum distance from it (7) by means of a nut. The cover (6) in the area central cam (2) becomes superfluous. Other items such as locking plates (4, 4 ') with their sliding supports (5, 5') and the springs (30, 30 ') are similar to those of the first variant.

Figure 7 and Figure 8 which is a section along A-A show a second variant of the locking device, according to the invention, mounted on the internal face of a door (1) cash. The cam (2) is located below the locking plates (4, 4 ') in a plane parallel to the door (1) and at a distance from the latter necessary for clearance mechanical.

The generally disc-shaped cam (2) is fixed at its center to the axis of the lock (7), parallel to the plane of the door (1). Two locking plates (4, 4 ') arranged symmetrically to the left and right of the lock (8) overlap partially the cam (2).

The body of the lock (8) is integral with the door (1). In a first realization the body of the lock (8) has a length greater than the thickness of the door (1). To to keep the cam (2) at a minimum distance allowing mechanical play by relative to the plane of the door (1), the fixing to the axis of the lock (7) is carried out by through a cover (6) as in the first variant.

The cam (2) is provided with two pins (3, 3 ') fixed symmetrically to the left and to right of the axis of the lock (7), in an area close to the edge and directed towards the locking plates (4, 4 ') parallel to the cam (2). These pins are engaged in respective slides (9, 9 ') in each locking plate (4, 4'). The length of the pins (3, 3 ') protruding from the cam (2) is determined so that their end is located flush with the upper face of the plates locking (4, 4 ') when they are in their corresponding slide (9, 9').

The locking plates (4, 4 ') are placed on supports (5, 5') similar to those of the first variant which maintain their parallel position above the cam (2) at a minimum distance allowing mechanical play.

Figures 7 and 8 show the configuration of the device when the door (1) is locked. Indeed, the locking plates (4, 4 ') protrude from the edges upper and side of the door (1) in order to fit into the grooves corresponding to the case of the box.

A rotation of the key in the lock (8) turns the cam (2). The pins (3, 3 ') run through their respective slide (9, 9 ') in the locking plates (4, 4') (following the arrows G, G ') while exerting a pushing force on the plates (4, 4 ') causing their displacement. These slides (9, 9 ') are arranged so as to ensuring a translational movement of the locking plates (4, 4 ') in the direction of the lock (8), (according to the arrows P, P '). Such a movement takes place thanks to elongated holes forming slides traversed by the support screws (5, 5 '). The plates (4, 4 ') leave the grooves of the housing thus allowing the opening of the checkout.

The springs (30, 30 ') of the previous variant are no longer necessary because the pins (3, 3 ') of the cam (2) actuate the locking plates (4, 4') by thrust forces on the edges of their slides (9, 9 ') both in one direction (lock) than in the other (unlock).

A second embodiment illustrated in FIG. 9 is applied to a door (1) of thickness equal to the length of the body of the lock (8). The cam (2) is thus directly attached to this axis parallel to the plane of the door (1) at a distance minimum of this (7) by means of a nut. The other elements of the lock remain similar to those of the variant with a lower door thickness.

A variant of the locking device according to the invention illustrated by Figures 10 and 11 aims to improve the safety of the device in the event of a breach by drilling pins 3 and 3 'of the cam. Indeed in the configuration represented by the Figures 7, 8 and 9, the removal of the pins of the cam (2) causes the unlocking of the door by releasing the locking plates from the grooves bordering the body box under the effect of gravity. To overcome this drawback, two additional pins (31, 31 ') have been added to the cam (2) so that protrude from the surface of the cam like the first pins (3, 3 '). They are located in the peripheral zone of the cam and on either side of the center of the latter so as to rest on a portion of the edge of each of the plates locks (4, 4 '). The role of these pins (31, 31 ') is to keep in position locked the locking plates (4, 4 ') in case of removal of the first pins (3, 3 ').

When unlocking the door by rotation of the cam (2) exerted by the key inserted in the lock, the pins (3, 3 ') engage in the slides (9, 9') causing a translation of the locking plates (4, 4 ') towards the center of the door as illustrated in figure 11. The additional pins (31, 31 ') are release support on the locking plates to free them for opening of the door (1).

According to another variant of the locking device illustrated in FIGS. 12 and 13, the additional pins (31, 31 ') can be replaced by a assembly consisting of a pin (40) integral with the door (1) on which are fixed two leaf springs (32, 32 '). This set is preferably located in the near the cam and near the two locking plates. Each blade of spring rests on a portion of the edge of each of the plates locking by keeping them in the locked position. These blades play the same role of holding the locking plates as the pins additional from the previous variant.

When the door (1) is unlocked, following the rotation of the cam (2), the plates locking (4, 4 '), moving towards the center of the door, push back the spring leaves (32, 32 ') against each other, the pins (3, 3') engaging in their respective slides (9, 9 ').

According to another variant, a second spring leaf holding assembly (41, 33, 33 ') can be arranged opposite the first symmetrically with respect to the center of the cam (2). The spring blades (33, 33 ') of this second set contribute to the balance of forces exerted by the spring leaves (32, 32 ') of the first together on the locking plates (4, 4 ') preventing their blocking possible due to mechanical play between the support screws (5, 5 ') and their slides respectively.

Claims (13)

Mechanical device for locking the door (1) of a box located on the internal face of this door comprising a key lock (8) accessible from the external face of the door, a cam (2) actuating at least one plate locking (4, 4 ') and integral with the axis of the lock (7), characterized in that this cam (2) extends generally parallel to the plane of the door (1) at a minimum distance necessary for mechanical play , said cam (2) comprises at least one drive part bearing on the edge of the locking plate (4, 4 '), the latter being mounted on a plurality of sliding supports (5, 5') integral with the door (1) and extends either on the same plane as the cam (2), or on a plane greater than the plane of said cam (2). Locking device according to claim 1 comprising a lock (8) whose length of the body is greater than the thickness of the door (1), characterized in that the cam (2) has in its central zone a cover (6) generally cylindrical surrounding the body of the lock (8), said cover (6) integral with the cam is fixed to the axis of the lock (7) by its upper face. Locking device according to claim 1 comprising a lock (8) whose length of the body is equal to the thickness of the door (1), characterized in that the first plate (2) is fixed directly in its central zone to the 'axis of the lock (7) projecting from the inner face of the door (1). Locking device according to claim 1 characterized in that it comprises two locking plates (4, 4 ') situated in a plane parallel to the door and arranged on either side of the lock (8), said plates ( 4, 4 ') have elongated orifices (9, 9') forming slides, crossed by screws provided with spacers serving as supports (5, 5 ') keeping them parallel to the door (1) at a minimum necessary distance to mechanical play. Locking device according to claims 1 to 4 characterized in that the cam (2) and the locking plates (4, 4 ') are located in the same plane, said plates (4, 4') are connected to at least one spring (30, 30 ') recalling the plates (4, 4') in the open position of the door (1). Locking device according to claims 1 to 5, characterized in that the shape of the cam (2) is generally elliptical. Locking device according to Claims 1 to 4, characterized in that the locking plates (4, 4 ') are situated in a plane parallel and greater than that of the cam (2) at a minimum distance necessary for mechanical play. Locking device according to claim 7 characterized in that the cam (2) is provided with two pins (3, 3 ') arranged on either side of the axis of the lock (7), in an area close to the edge of the cam (2), and directed towards the locking plates (4, 4 '), said pins (3, 3') are engaged in respective slides (9, 9 ') in each locking plate (4, 4 '), the length of said pins (3, 3') protruding from the cam (2) is determined so that their end is located flush with the upper face of the locking plates (4, 4 '). Locking device according to claims 7 and 8, characterized in that the shape of the cam (2) is generally circular. Locking device according to claims 7 to 9 actuated by the rotation of the key in the lock (8), characterized in that the pins (3, 3 ') of the cam (2) run through their slide (9, 9') respective in the locking plates (4, 4 ') while exerting a pushing force on the plates (4, 4') causing their movement, said slides (9, 9 ') are arranged so as to ensure a translational movement locking plates (4, 4 ') which slide on their supports (5, 5'). Locking device according to Claims 7 to 10, characterized in that the cam (2) has two additional pins (31, 31 ') located in the peripheral zone of the cam (2) and on either side of the center of said cam cam so as to rest on a portion of the edge of each of the locking plates (4, 4 '), said pins (31, 31') serving to keep the locking plates (4, 4 ') in the locked position case of removal of the first pins (3, 3 '). Locking device according to claims 7 to 10 characterized in that the door (1) comprises a first assembly consisting of a pin (40) on which are fixed two leaf springs (32, 32 ') located in the vicinity of the cam (2) and near the two locking plates (4, 4 '), each leaf spring (32, 32') rests on a portion of the edge of each of the locking plates (4, 4 ') keeping them in the locked position. Locking device according to claims 7 to 10 and 12 characterized in that the door (1) comprises a second assembly consisting of a pin (41) on which are fixed two spring leaves (33, 33 ') located opposite the first set (40, 32, 32 ') symmetrically with respect to the center of the cam (2), the spring leaves of each of these sets (32, 32, 33, 33') respectively rest on a portion of the edge of each locking plate (4, 4 ') keeping them in the locked position.

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