FR2583451A1 - Door lock equipped with a protective device - Google Patents

Abstract

The protective device of a lock 2 with a cylinder 3 comprises an outer recessed backplate 10 fastened against the door 1, said recess containing a protective member 26 for the head of the cylinder 5 and shims 23 which are arranged on one side and/or the other of a collar 29 of the member 26, in order to compensate, by the amount of a lengthening step of the cylinders 3 selected from a range, any variation in the distance at which the head of the cylinder 5 projects towards the outside of the door 1. The backplate 10 is retained against the door 1 by an inner plate 39 and connecting members 18, 19, 40 passing through the door 1. The invention is used for equipping doors provided with a cylinder lock of the stud-mounted or surface-mounted lock type.

Description

DOOR LOCK EQUIPPED WITH A PROTECTION DEVICE
The present invention relates to a cylinder lock or security barrel fitted with a protection device, the lock possibly being a mortise lock or a surface-mounted lock.

 It is known that cylinder locks are mounted in doors, in particular pivoting doors with a single leaf, so that the cylinder passes through the door in its thickness and has, projecting outwards relative to the external face of the door, a cylinder head, in which is formed a key insertion opening. The cylinder also has, in the part of its lateral face located either in the thickness of the door, if it is of a mortise lock, or projecting inwards with respect to the internal face of the door, in the case of a surface-mounted lock, a light in an arc of a circle through which passes a bit of actuation of the lock mechanism maneuvering the bolt and allowing its locking in the strike, mounted, for example, in the door jamb, this lock mechanism being respectively housed in a mortise of the door (mortise lock) or fixed against the internal face of the door (lock applied).

 The protection of the cylinder heads of such locks poses a problem, since the thickness of the doors can vary from one door to another, as well as the position of the housing mortise of the lock mechanism, in the case of mortise locks. As a result, the installer of the lock and / or of a protection device does not know in advance the distance over which the cylinder head projects outwards from the door.

 Currently, after having mounted the lock, the installer measures this projection distance and chooses, in a set of rosettes of different thicknesses, the one whose thickness is closest to the measured distance, and he then arranges it around of the cylinder head and fixes it against the external face of the door. The protection thus provided is only very imperfect, because it is possible to blow up the rosette of the door using a chisel, and then to have access to the head of the cylinder to tear it off or force it by twisting. In addition, such a rose practically does not protect the lock mechanism against the holes made through the door and in the mechanism, in order to force the latter.

 By the invention, it is proposed to remedy these drawbacks, and the invention aims to provide a protection device which makes it possible to protect not only the cylinder against attempts to break in by tearing and / or twisting, but also the lock mechanism against attempts to break in by drilling through the door, and this although the projection of the cylinder relative to the door may be different from one door to another, and taking into account that the cylinder of the lock can be chosen from a range of cylinders of standard lengths staggered with a constant pitch which, according to European standards, is 5 mm.

 At the same time, the object of the invention is to propose a protection device which is independent of the direction of opening of the door, and which can be easily manufactured to take into account the different widths of the areas of overlap of the door by the jamb, from the edge of the door and in its closed position.

The subject of the invention is the new industrial product which constitutes a door lock equipped with a protection device, and which is characterized by the fact that it comprises
an outer counter plate, intended to be kept applied by a bearing face against at least one zone of the outer face of the door, which extends opposite the lock and around the cylinder head, the counter plate having a recess which opens in its bearing face and the bottom of which has an orifice of a cross section greater than that of the cylinder, said orifice passing through said bottom and opening into the external face of the counterplate
a cylinder protection member, comprising a tubular body intended to surround the cylinder head and to be engaged, with a small clearance, in the orifice of the counterplate, said tubular body being partially closed, at that of its axial ends which is intended to protrude outside the counterplate, partially closed by a radial disc pierced with an orifice limiting access to the opening for inserting the key, the tubular body carrying a flange external radial on a part adjacent to its other axial end, said other end being housed in the recess of the counterplate
a seat plate, which has a through hole for the cylinder and which is applied to the counter plate to constitute a closure of the recess;
at least one adjustment shim intended to be housed in the recess between the flange and the bottom of said recess or between the flange and the seat plate, the thickness of the adjustment shim (s) being chosen so that after the positioning of the cylinder protection member and the adjustment shim (s) in the recess then the closing of the latter by the seat plate, the radial disc of the cylinder protection member is applied to the cylinder when the counter plate is applied against the door, the counter plate, the cylinder protection member and the shim (s) being made in materials having, at least superficially, a high hardness.

 In such a device, which protects the cylinder and the lock, and which is suitable for a door lock opening both on the right and on the left, the adjustment of the thickness of the shims is advantageously facilitated, according to a characteristic specific to the invention, by the fact that the adjustment shim (s) are produced in the form of a set of thickness adjustment plates, all having the same thickness and which are all stacked between the flange and the bottom of the recess and / or between the flange and the seat plate, according to a repartition making it possible to adjust the cylinder protection member on the cylinder. In particular, for a lock whose cylinder is chosen in a range of cylinders of standard lengths staggered with a constant pitch p in mm, the set of adjusting plates includes (p - 1) plates of 1 mm thick each, intended to be distributed on either side of the flange so as to compensate, on the value of a step of variation of lo cylinder length, any variation in the distance over which the cylinder projects outward from the door.

 Preferably, in order to improve the protection of the cylinder head, the cylinder protection member also includes a cylinder rotor protection washer and a retaining base; the washer is mounted to rotate freely in the orifice of the radial disc at the end of the tubular body, while being retained axially outwards by pressing against this disc, and it has an opening which allows the opening for the introduction of the key in the cylinder rotor when the washer occupies a particular position in rotation relative to the cylinder protection member, the retaining base has a key passage opening and it is fixed in the tubular body, in position contiguous with. relative to the end disc, in order to retain the washer axially towards the inside of the tubular body.

 In addition, it is advantageous for the device also to include a shim for compensating for the thickness of the flange, this compensation shim being intended to be housed in the recess of the counterplate and in the radial extension of the flange, so as to substantially complete the filling of the recess of the counter plate, and to ensure, with the thickness adjustment plates, additional protection of the lock mechanism against drilling. To this end, and in order to facilitate the positioning of this compensation shim in the recess, it is p-referable that the compensation shim has a cut shape at least partially slightly complementary to the shape of the collar, this cut allowing centering the shim around the flange.

 In order to obtain good securing of the protection device to the door, this device further comprises an internal plate intended to be applied by a bearing face against the internal face of the door and to retain the plywood against the external face of the door by connecting means intended to pass through the door in its thickness.

 In a preferred embodiment, the connection means comprise terminals, which are integral with the counterplate by one of their ends, and extend substantially perpendicular to the bearing face of the plywood; these terminals have an axial bore tapped in their other end and are intended to be engaged in holes made in the door and to be connected to the inner plate by screws, which pass through said inner plate and are screwed into the tapped bores of the terminals until their heads are held against the inner plate. In this way, the terminals provide excellent protection of the fixing screws, and therefore of the connection of the internal plate to the counter-plate, against the oblique holes, which would be formed through the part of the door which surrounds the counter plate.

 In order to protect the connection of these terminals to the counterplate against biased drilling, and to ensure that the counterplate is anchored sufficiently well on the door, several of the terminals are welded to the bottom of countersinks made in the bearing face of the counter-plate and regularly distributed around the periphery of this counter-plate, and at least one terminal, in a substantially central position, is welded to the bottom of the recess of the counter-plate.

 In the latter case, for each terminal fixed to the bottom of the recess, the seat plate and each adjustment shim respectively have a hole and a cutout for passage of the terminal, which has the additional advantage of facilitating the positioning of the shims or plates by centering, on the one hand, on this central terminal, and, on the other hand, around the cylinder protection member. Substantially for the same purpose, and in order to facilitate the mounting of the device while by improving the protection provided, the adjustment and compensation shims adjust in the recess, and the seat plate closes said recess by being applied by its edge against the bottom of a peripheral counterbore surrounding the recess, at using screws which pass through the seat plate and are screwed into the peripheral counterbore, and so that the shims and the cylinder protection member are secured to the counterplate.

 Furthermore, in order to facilitate the installation of the interior handle for operating the lock, the interior plate advantageously carries at least one nut for fixing by screwing an interior crutch support plate on the face opposite to the face of support of the inner plate.

 When the lock is intended to be mounted on a door having, from its edge, an area of overlap by the jamb, in the closed position of the door, the counter-plate is advantageously produced in order to present an edge adjacent to the edge of the overlap area, so that the protection extends as close as possible to the frames. This can be easily achieved by manufacturing counter-plates, the dimensions of which, in particular transverse, take account of the distances which have to separate the axis of the cylinder from the edge of the door on the most used locks.

 In this way, a practically unique and adjustable model of protection device is obtained, the only specific member of which is the counterplate, and which is suitable for the vast majority of installation cases. We can easily understand the interest presented by such a device in terms of manufacturing, storage, marketing and installation.

 To better understand the object of the invention, we will now describe, by way of purely illustrative and non-limiting example, an embodiment shown in the accompanying drawing.

On this drawing
FIG. 1 is a view in vertical and transverse section of a protection device according to the invention mounted on a door equipped with a mortise lock,
FIG. 2 is a partial schematic view, in horizontal section along II-II of FIG. 1, of the door and its jamb, showing the relative positions of these elements, of the cylinder and of certain elements of the protection device,
FIG. 3 is a view showing in elevation the bearing face of the counterplate, with its recess, and certain elements of the device which are housed in this recess,
FIG. 4 is a partial view, in section through an axial plane, of the cylinder head and of the elements of the device which protects it, and
- Figures 5A, 5B and 5C are three partial schematic views, in cross section, showing three modes of mounting the same protection device, to suit three different distances from the cylinder projection relative to a door.

 Referring to Figures l A 3, the door l is equipped with a larder lock 2, the outline of which is represented in FIG. 1 by dotted lines, and which comprises a cylinder 3. The cylinder 3 is mounted in a bore which crosses the door l clnnr its thickness, and the central part of the lateral surface of the cylinder 3 has a light 4 in an arc of a circle which, by a suitable axial positioning of the cylinder 3 relative to the door l, opens in the mortise of door 1 in which are housed the lock mechanism called "wdemi- tour", for the control of the bolt, and the associated lock mechanism for locking the bolt in a keeper mounted in the frame 6. In this position of the cylinder 3 , the cylinder head 5, which has an opening for inserting the key in its end face, protrudes a certain distance outside the external face of the door 1. A bit passing through the light 4 and moved in rotation therein by the m operation of the key in the cylinder 3, activates the mechanisms of the lock 2 in order to operate the bolt. As the internal structure of the cylinder 3, the bit, the mechanisms of the lock 2, the bolt and the keeper are well known organs, on which the invention does not relate, they have not been shown and are not more described.

 As shown in Figure 2, the door 1 is a single leaf door opening to the right, and closing on a frame 6, whose shape is such that in the closed door position, the inner face 8 of the door 1 is an extension of the internal face of the doorframe 6, while a rectangular zone 9 of the external face 7 of the door is covered by an external part of the doorframe 6, this covering zone 9 being rectangular, adjacent to the edge of door 1, and extending over the entire height of this door. In the example shown, the cylinder 3 is a double profiled cylinder, chosen from a range of cylinders whose standard lengths range from 5 to 5 mm, and which is coupled to the lower part of the lock 2.

 The protection device comprises an external steel counterplate 10, of rectangular shape with rounded tops, which is joined by a bearing or internal face 11 against the external face 7 of the door, and which covers an area of this face 7 which extends not only opposite the lock 2 and the cylinder 3, but also beyond the horizontal projection of the silhouette of the lock 2 on the external face 7 of the door, upwards and downwards, as this is visible in Figure 1, and also laterally. In the example shown, the two long sides of the outer counter plate 10 are arranged vertically, parallel to the edge of the door 1, and the width of the counter plate 10 is such that the longest side closest to the edge of the door 1 is as close as possible to the edge of the overlap zone 9, and directly adjacent to the jamb 6, in order to prevent the introduction of a crowbar between the door 1 and the frame 6 (see figure 2). A recess 12, of rectangular shape whose length is parallel to the length of the plate 10, and symmetrical with respect to the vertical median plane of the plate 10, is formed in a part of the bearing face 11 which extends slightly beyond the lower half of this face. A peripheral counterbore 13 surrounds this recess 12, and two screw holes 14 are drilled in this counterbore 13, on the vertical median axis of the plate 10 and of the recess 12 ( see figure 3). The bottom of the recess 12 is pierced, in its lower half with a circular orifice 15 of a diameter greater than that of the cylinder 3 and centered in the vertical median plane, and this orifice 15 opens into the external face 16 of the plate 10. Near each of these four vertices, a small circular counterbore 17 is also made in the bearing face 11 of the plate 10, and a terminal 18, cylindrical, of circular section and made of steel, is welded to the plate 10, at the bottom of each counterbore 17, so that the terminals 18 extend perpendicularly to the support face 11 and projecting therefrom. At the center of the plate 10, another terminal 19, also cylindrical of circular section and made of steel, but smaller in diameter than the terminals 18, is welded to the bottom of the recess 12 and extends perpendicular to the bearing face 11, on the same side as the terminals 18. The terminals 18 and 19 each have a threaded bore 20 which opens in their free end face, and the terminals 18 terminate in a frustoconical end piece 21 facilitating their engagement in bores 22 passing through the door 1 in its thickness and housing the terminals 18 and 19 (see FIGS. 1 and 3).

 The welded assembly constituted by the counter plate 10 and the terminals 18 and 19 in steel has undergone a treatment of the carbo-nitriding type or the like, in order to have a high surface hardness. Against the bottom of the recess 12 are arranged side by side four shims or thickness adjustment plates 23, identical, with a thickness of 1 mm and made of hard steel, the shape of which is shown in FIG. 3. Each plate 23 has a rectangular shape with a rounded top which corresponds to that of the recess 12, in which it adjusts. Each plate 23 is pierced with an orifice 24 which is superimposed on the orifice 15 when the plate is disposed in the recess 12, and it also has a notch 25 opening in its upper edge and in which the terminal is housed central 19 when the plate 23 is disposed in the recess 12. The rounded notch 25 facilitates the centering of the plate te 23 around the terminal 19 when it is placed in the recess 12.

 The device also comprises a member 26 for protecting the cylinder. This member 26 (see Figures 1 and 4) comprises a tubular body 27, of cylindrical shape with circular section, of which an axial end, slightly chamfered on the outside, is partially closed by a radial disc 28, which is pierced with an eccentric circular opening , forming an opening for the passage of the key towards the opening for introduction into the cylinder 3, when the tubular body 27 is mounted on the cylinder head 5. The internal and external diameters of the tubular body 27 are respectively greater than the external diameter of the cylinder 3 and slightly smaller than the diameter of the orifices 15 and 24, so that the tubular body 27 can be mounted with play around the cylinder head 5 and with little play only in the orifices 15 and 24 of the plates 23 and from the bottom of the recess 12. The other axial end of the tubular body 27 carries a circular flange 29 projecting radially outwards, and the axial length of the tubular body 27 is such that, when it is placed in the recess 12 and applied by its flange 29 against the plates 23, and engaged in the orifices 24 and 15, the radial end disc 28 projects outwards relative to the external face 16 of the counter plate 10, to protect the cylinder head 5.

The cylinder protection member 26 also comprises a washer 30, made of treated steel, like the tubular body 27, and which is mounted to rotate freely in the circular opening of the disc 28. This washer 30 is a shouldered washer retained axially outwardly by its shoulder against a shoulder of complementary shape presented by the disc 28 and delimiting the eccentric opening in the latter. The washer 30 does not reveal the opening for introducing the key
C in the cylinder head 5 only when it occupies a particular position in rotation in the tubular body 27 (FIG. 4). In addition, this washer 30 is retained axially inwards by a base 31, in the form of a circular disc. thin, having an opening for the passage of the key C, and which is force fitted at the bottom of the tubular body 27, against the disc 28, making the three parts 27, 30 and 31 which constitute the cylinder protection member integral 26, and the washer 30 of which more precisely ensures protection of access to the cylinder head 5, to which the base 31 is practically attached when the device is adjusted to the cylinder 3.

 The filling of the recess 12 is practically completed by the presence of a shim 32 for compensating for the thickness of the flange 29. This compensation shim 32 is a small plate whose shape is shown in FIG. 3: it is rectangular with a concave cutout 33 in one of its sides, along an arc of a radius slightly larger than that of the cpilerette 29, so that it can be placed in the recess 12 and against the plates 23, between the central terminal 19 against which it is supported by its upper right side, and the flange 29 which it extends radially in the upper part of the recess 12 and of which it partially surrounds the periphery thanks to its concave cutout 33, which facilitates its centering during installation.

 The depth of the recess 12, relative to the bottom of its peripheral counterbore 13, is equal to the thickness of the flange 29, therefore of the shim 32, increased by 4 mm (which represent the thickness of the stack of four plates 23 of 1 mm thickness each), and the recess 12 is closed on the plates 23, the wedge 32 and the protective member 26, by a seat plate 34 of steel whose thickness corresponds to the depth of the counterbore 13, and the shape of which is shown in FIG. 3: this plate 34 has a rectangular shape corresponding to that of the counterbore 13 in which it comes to adjust by resting by its edge on the bottom of this counterbore 13. The plate 34 has a first circular orifice 35, of diameter slightly greater than that of the cylinder 3 and centered on the axis of the latter and in the vertical median plane of the counterplate 10 and of the recess 12, as well as a second circular orifice 36, of diameter slightly greater than that of the section of the terminal 19, for the passage thereof through the seat plate 34.

The latter is finally pierced with two small screw holes 37, which are placed on the screw holes 14 drilled in the bottom of the counterbore 13 when the seat plate 34 is placed in the counterbore 13, while being engaged and guided by its orifice 36 on the terminal 19. When the seat plate 34 is fixed to the counter plate 10 by two screws such as 38 (Figure 1), so that its face opposite to the recess 12 is. as an extension of the bearing face 11 of the counter plate 10, it secures the protective member 26, the shim 32 and the pads 23 to the counter plate 10.

 The anchoring of this assembly to door 1 is ensured using an inner plate 39 and five countersunk screws 40. The inner plate 39 has a rectangular shape of the same dimensions as the counter plate 10, and it is pierced with a circular orifice 41 for passage of the cylinder 3 (the end face of the internal side of the door also has an opening for introducing the key for locking from the inside), with an orifice 42 for the passage of an axis of the handle for operating the lock 2 from the inside, and for five holes for the passage of the screws, of frustoconical shapes, serving as housings for the heads of the screws 40 when their threaded rods are screwed into the bores tapped 20 of terminals 18 and 19, and ensure the retention of the counter plate 10. The inner plate 39 carries, projecting on its bearing face by which it is applied against the internal face 8 of the door 1, two nuts such as 43 (figure 1) which are each housed in a small recess dug in the internal face 8 of the door 1, and into which are screwed screws 44 for fixing an interior crutch support plate 45, the crutch handle 46 of which has its axis which passes through the orifice 42 to enter the lock 2 .

 In this device, the tubular body 27 can be left free to rotate about its axis, or on the contrary immobilized in rotation relative to the counterplate 10, for example by machining in the flange 29 two flats by which this flange is in contact with the long sides of the recess 12. The washer 30, which is particularly exposed, can be made of carbide, instead of treated steel, or of an alloy of the two. It can be seen that the thickness adjustment plates 23, the compensation shim 32, the seat plate 34 and even the flange 29 constitute as many obstacles which, with the counter plate 10, protect the lock 2 against the holes through door 1, from the outside.

The extension of the counter plate 10 beyond the only projection of the lock 2 on the face 7 of the door 1, as well as the positions of the terminals 18 around the lock 2 also ensure good protection of this lock against the biased holes.

 The example shown in FIG. 1 corresponds to a fitting case in which the thickness of the door 1, the length of the cylinder 3, and the position of the transverse median plane of the cylinder 3 relative to the door 1 are such that the distance over which the cylinder head 5 projects from the external face 7 of the door 1 corresponds to the sum of the thickness of the seat plate 34 and the axial depth of the tubular body 27 up to 1 'retaining base 31. In this case, the four plates 23 are all located between the flange 29 and the bottom of the recess 12.

 On the other hand, if the door 1 was less than 1 mm thick, or if the relative position of the cylinder 3 and of the door 1 resulted in the projection distance from the cylinder head 5 being greater than 1 mm, only three plates 23 are arranged between the collar 29 and the bottom of the recess 12, the fourth plate 23 being disposed between the collar 29 and the seat plate 34.

 In FIGS. 5A to 5C, there is shown diagrammatically (and without showing the seat plate 34), three adjustment configurations, corresponding to three different installation cases, of the device described above with reference to FIGS. 1 to 4 In FIG. 5C, which corresponds to the configuration in FIG. 1, there are the four thickness adjustment plates 23 arranged side by side between the flange 29 of the protective member 26 of the cylinder 3 and the bottom of the recess in the counterplate 10. If, in a second installation case, the position of the lock in the thickness of the door 1 changes and / or if the thickness of the door 1 changes so that the transverse median plane M of the cylinder 3 is off-center towards the external face 7 of the door 1, and that the projection distance from the cylinder head 5 is thereby increased by 3 mm, it is necessary, when mounting the device, leave a single plate 23 between the collar 29 and the bottom of the recess of the counter plate 10 , while the other three plates 23 must be placed against the flange 29 but on the side of the door 1, as shown in FIG. 5B, which makes it possible to adjust the protective member of the cylinder 26 on this cylinder 3. If , in a third installation case, and for the same reasons as those explained above, the median plane M of the cylinder 3 is again displaced by 1 mm towards the external face 7 of the door 1, then the four plates 23 are arranged side by side and on the side of the flange 29 which faces towards the door 1, as shown in FIG. 5A. Finally, if, in a fourth installation case, the median plane M of the cylinder is still displaced by 1 mm towards the external face 7 of door 1, then the installer changes the cylinder for another, chosen from the range of cylinders of standard lengths, and having a length less than the value of one step, i.e. - say 5 mm, and with this new shorter cylinder, it adopts the configuration of Figure 5C, placed nt the four plates 23 between the collar 29 and the bottom of the recess of the counter plate 10.

 This protective device therefore makes it possible, as a function of the relative positions of the plates 23 and of the collar 29, to compensate for the 5 mm of the pitch of extension of the cylinders of the range available for equipping the lock. The installer therefore chooses the length of the cylinder that is suitable in the staggered range of 5 to 5 mm, taking into account the thickness of the door and the distance between the axis of the lock (located in the plane M of the cylinder ) from the outside of the door. I1 then only remains to properly arrange the thickness adjustment plates 23 to adjust the cylinder protection member on the cylinder.

 Since, on most cylinder locks, the entry of the key into the cylinder must be 40 or 50 mm from the edge of the door, it is necessary to manufacture counter-plates 10 of two different widths, so that 'They extend to the immediate vicinity of the overlap zone 9 (see Figure 2). Subject to choosing well, at each installation, the counter plate 10 of the correct width, which presents no difficulty, the unique and adjustable model of protection device forming the subject of the invention makes it possible to ensure the most poses.

 I1 is understood that the device described above may give rise to any desirable modifications, without departing from the scope of the invention.

Claims (12)

 1. Door lock equipped with a protection device, said lock (2) comprising a cylinder (3), the head (5) of which has an opening for the introduction of a key (C) into said cylinder (3 ), said cylinder head forming on the outer face (7) of the door (1) a projection, the length of which over a distance depends on the length of the cylinder (3), the thickness of the door (1) and the position of the cylinder (3) relative to the door (1), characterized in that it comprises  an outer counter plate (10), intended to be kept applied by a bearing face (11) against at least one zone of the outer face (7) of the door (1), which extends opposite the lock (2) and around the cylinder head (5), the counterplate (10) having a recess (12) which opens in its bearing face (11) and the bottom of which has an orifice (15 ) of a cross section greater than that of the cylinder (3), said orifice passing through said bottom and opening into the external face (16) of the counterplate (10)  a cylinder protection member (26), comprising a tubular body (27) intended to surround the head of the cylinder (5) and to be engaged, with little play; in the orifice (15) of the counterplate (10), said tubular body (27) being partially closed, at that of its axial ends which is intended to protrude outside the plywood, partially closed by a radial disc (28) pierced with an orifice limiting access to the key insertion opening, the tubular body (27) carrying an external radial flange (29) on a part adjacent to its other axial end, said other end being housed in the recess (12) of the counterplate (10)  a seat plate (34), which has a through hole for the cylinder (3) and which is applied to the plywood (10) to constitute a closure of the recess (12)  at least one adjustment shim (23) intended to be housed in the recess (12) between the flange (29) and the bottom of said recess (12) or between the flange (29) and the seat plate (34) , the thickness of the adjustment shim (s) (23) being chosen so that after the protection member (26) of the cylinder (3) and the (or ) shim (s) of adjustment (23) in the recess (12) then the closing of the latter by the seat plate (34), the radial disc (28) of the protective member (26) of the cylinder (3), applies to the cylinder (3) when the plywood (10) is applied against the door (1), the counterplate (10), the protective member (26) of the cylinder (3 ) and (or) wedge (s) (23) being made of materials having, at least superficially, a high hardness.  2. Lock according to claim 1, characterized in that the (or) shim (s) of adjustment (23) are made in the form of a set of thickness adjustment plates all having the same thickness.  3. Lock according to claim 2, the cylinder (3) of which is chosen from a range of cylinders of standard lengths staggered with a constant pitch p in mm, characterized in that the set of adjusting plates (23) comprises ( p - 1) plates of 1 mm thickness each, intended to be distributed on either side of the collar (29) so as to compensate, over the value of a step p of variation in length of the cylinders, any variation of the distance over which the cylinder (3) projects towards the outside of the external face (7) of the door (1).  4. Lock according to one of claims 1 to 3, characterized in that the cylinder protection member (26) also comprises a washer (30) for protecting the cylinder rotor (3) and a retaining base ( 31), this washer (30) being mounted to rotate freely in the orifice of the radial end disc (28) of the tubular body (27), being retained axially outward by pressing against this disc (28), and having an opening which reveals the opening for the introduction of the key (C) in the cylinder rotor, when the washer (30) occupies a particular position, in rotation, relative to the tubular body (27), the base retainer (31) having a key opening (C) and being fixed in the tubular body (27) in an adjoining position relative to the end disc (28), in order to retain the washer (30) axially towards the interior.  5. Lock according to one of claims 1 to 4, characterized in that it also includes a shim (32.) for compensating the thickness of the flange (29), this compensation shim (32) being intended to be housed in the recess (12) of the counterplate (10) and in the radial extension of the flange (29).  6. Lock according to claim 5, characterized in that the compensation shim (32) has a cutout (33) of shape at least partially complementary to the shape of the flange (29), this cutout allowing the centering ae the wedge (32) around the flange (29).  7. Lock according to one of claims 1 to 6, characterized in that it includes an inner plate (39) intended to be applied by a bearing face against the inner face (8) of the door (1) and to retain the counterplate (10) against the external face (7) of the door (1) by connecting means (18, 19, 40) intended to pass through the door (1) in its thickness.  8. Lock according to claim 7, characterized in that the connecting means comprise terminals (18, 19), which are integral with the counterplate (10) by one of their ends, extend substantially perpendicularly to the bearing face (11) of the counterplate (10), and have a threaded axial bore (20) in their other end, said terminals (18,19) being intended to be engaged in holes (22) formed in the door (1) and to be connected to the inner plate (39) by screws (40) passing through said inner plate and screwed into the threaded bores (20) of the terminals (18,19).  9. Lock according to claim 8, characterized in that several (18) of the terminals are welded to the bottom of counterbores (17) formed in the bearing face (11) of the counterplate (10) and regularly distributed at the periphery of this counter-plate, and at least one terminal (19), in a substantially central position, is welded to the bottom of the recess (12) of the counter-plate (10).  10. Lock according to claim 9, characterized in that, for each terminal (19) fixed to the bottom of the recess (12), the seat plate (34) and each shim (23) have respectively a hole (36) and a cutout (25) for passage of the terminal (19).  11. Lock according to one of claims 7 to 10, characterized in that the inner plate (39) carries at least one nut (43) for fixing by screwing (44) a crutch support plate (45) inside on the face opposite to the bearing face of the inner plate (39).  12. Lock according to one of claims 1 to 11, characterized in that the adjusting shims (23) and compensation (32) adjust in the recess (12), and that the seat plate ( 34) closes said recess (12) by being applied by its edge against the bottom of a peripheral counterbore (13) surrounding the recess (12), using screws (38) passing through the seat plate (34 ) and screwed into the peripheral plate (13), the shims (23, 32) and the protective member (26) of the cylinder (3) thus being secured to the counterplate (10).