ES2200127T3 - PERFECTION IN THE LOCKS. - Google Patents

Abstract

A lock for a door or the like has a deadbolt assembly which comprises a bolt (15) and a drive mechanism in the form of a bolt thrower (20) which is adapted to be operated by a key. A lever (18) is arranged between a surface (16a) of the bolt (15). The bolt thrower (20) is arranged to move the bolt (15) between bolted and unbolted positions by engaging in a recess (15d) when said bolt thrower is rotated. The lever (18) is so configured that, when the bolt thrower is operated to move the bolt from the unbolted to the bolted position, the lever is effective to increase the throw of the bolt by at least 3mm. The lock is applicable to both multi-detainer mortice locks and cylinder operated locks. <IMAGE>

Description

Improvement in locks.

This invention relates to about improvements in locks and is especially related with means to increase the thrust or movement of the latch of a lock.

Maximum longitudinal movement or "thrust"  of the latch of a mortise lock is limited by the width of the lock case. When the latter has to be installed in a solid wood door, for example, the width of the box is relatively unimportant because it does not exist limitation on the depth of the door recess that must be Receive the lock box. However, in the case of a predominantly glass door with a surrounding frame of wood or plastic material, the maximum width of the box Lock must be less than the width of the door body. Normally, the bodies of such doors have a width in the 100 mm zone and the maximum overall width of the lock boxes that can be installed in said door bodies is of the order of 75 mm

In order to attach to a door body of the aforementioned type, the maximum distance from the front outside of the box to the axis of a lock cylinder is of the order of 57.0 mm and the distance from the front exterior of the front end of the lock mentioned cylinder or axis of the toggle key is commonly called later game. When a lock of this class is provided with a latch, this is conventionally arranged to be operated using a cylinder cam or punch pin pusher and with a rear set of only 57.0 mm, the maximum output of the pin, that is, the distance at which the pin protrudes from the front end of the front end when the latch, which can usually be obtained by direct drive by means of a cylinder cam or latch pusher, it is of the order of only 14 mm. This distance is insufficient to provide a Secure closing coupling on the frame surrounding the door. A similar problem arises with mortise locks latches With multiple stops.

The problem becomes especially acute with the use of new materials such as the uPVC in which there is a important space between the edge of the door and the frame surrounding. In order to comply with the EU standard, a 20 mm offset so that the head of the latch protrudes from a side plate of the frame at a distance that is Enough to give security to the door.

A lock has been proposed in WO95 / 01491 that it has a set that comprises the slamming mechanism and drive adapted to be operated with a key, in which the actuator mechanism comprises a drive link arranged to be operated by a lever moved by the key and arranged in turn to move the punch pin and a quadrant to transfer the driving force from the link actuator to the stroke pin, so that the movement or stroke of the strike latch increases with respect to drive link offset.

Although this previous and known provision can achieve the desired goal of increasing displacement of the latch, the present invention attempts to provide a mortise lock that is easier to manufacture and that still have a projection for the pin or offset increased for a given width of the lock case in order to obtain a more secure coupling with the plate mounted on the door frame.

Also, in DE 2525771 a proposal has been proposed lock that has a set of latches comprising a pin and drive mechanism in the form of a rotating cam which is operated by a key. A lever is mounted in the box articulated arranged to be moved by the cam when the Slam latch is operated by the cam from the position of retraction to the outgoing position and to move the latch of so that an additional movement is applied on it to Increase your displacement. The lever is mounted on a bolt protrusion of the lock and thus, a part of the lever protrudes of the lock when the latch is in the position of retraction. This is a major inconvenience and makes this provision is inappropriate for a high lock security.

The present invention provides a lock. That overcomes this inconvenience.

According to the invention, a lock is provided for a door or similar that presents a box and a set of latch comprising a bump pin and a mechanism actuator with a rotating cam that is adapted to be operated by a key, in which a lever is placed between the actuator mechanism and the latch and is arranged so that when the lever is actuated by the mechanism actuator to move the latch from a retracted position to a outgoing position, the lever configuration is such that apply an additional movement to the latch to increase your displacement, the lever being mounted articulated on a bolt mounted in the box and the lever being arranged to be pushed by the cam during the latter's rotation to move the latch to the outgoing position, articulating the lever around the bolt and increasing lateral movement or displacement of the latch, the lever being arranged so that does not act in the movement of the retracted position latch to the projection, characterized in that the lever affects a latch surface when moved to position outgoing and because the lever is located completely inside the lock case in both retracted and outgoing position of the latch.

The invention is described below with detail by way of example, with reference to the drawings, in the which:

Figure 1 is a perspective view exploited from an embodiment of a mortise lock with five retainers according to the invention;

Figure 2 is an elevation view of the lock of figure 1, which presents the lock in its state of opening and with only one of the retainers represented;

Figures 3 and 4 are elevational views of the lock of figure 2, but showing the component parts of the lock during movement from the open position to the closed position;

Figure 5 is a schematic view that represents the dimensional results of the changing geometry of the pin mechanism when it moves from the position of  open until closed;

Figures 6 and 7 are elevational views of the lock represented in figures 2 to 4, but showing other phases of the closing sequence;

Figure 8 is a side elevational view of the lock of figures 2 to 4, but showing the parts components of the lock in closed position;

Figures 9 to 12 are side elevation views of the lock of figure 2, but showing various phases during the opening sequence;

Figure 13 is a perspective view exploited from an embodiment of a lock operated by cylinder according to the invention;

Figure 14 is a side elevational view of the lock of figure 13 in its open state;

Figures 15 to 17 are side elevation views of the lock of figure 14, but showing the parts components thereof during its movement from the position of open to the closed position;

Figure 18 is a side elevational view of the lock of figures 13 to 17, but showing the same in its closed state;

Figure 19 is a side elevation view corresponding to figure 18, but showing a new movement of the drive cam, and

Figures 20 to 22 show various sequences operating of a blow pin that is part of the lock according to the invention.

In the drawings similar parts are designated with similar reference numbers.

First reference is made to the figures 1 to 8 of the drawings in which a lock according to the invention it comprises a box 1 on one side of which an element is mounted internal terminal 3 and an external terminal element 4 (no represented in figure 1). The box is arranged to fit closed by a cover plate 2. A latch assembly suddenly it is mounted with alternative movement in the box and it comprises a strike latch 5 fixed to a support 6 by screws 7 that fit into threaded holes 6a fixed in the support 6. The latch 5 is pushed by a spring 8 to emerge through an opening 4a than in the terminal elements 3, 4 support under normal conditions, resting the spring on a end against a wall 6a of the latch 6 and, at its other end, against a side wall that of the box 1. The spring 8 is held in position by means of retaining projections 9a and 9b fixed respectively to the wall 6a of the latch 6 and to the wall that of the box 1, inserting into the respective ends of the spring 8. The latch 6 is guided for a sliding movement in the box 1 by a bolt 10 which is fixed in the box and extends to through an elongated opening 6b existing in latch 6. The arm 11a of a follower 11 is located between bolt 10 and the wall 6a of latch 6, the follower being mounted on a rod of square section (not shown) that extends through the box and has a handle or handle (not shown) fixed to by At least one of its ends. The follower arm 11a is provided of a stud 11b to retain one end of a spring 12, whose other end leans against the wall of the box and is located there by a projection 13 that is fixed to said wall of the box. A spacer 14 serves to place the follower 11 in the box 1. By turning the handle the rod is rotated and therefore the follower 11 against spring action 12. Rotating follower 11 causes the follower arm 11a to move the latch 6 against the spring action 8 and the latch move along the bolt 10 to retract the head 5 of the latch towards the inside of the box 1. If the handle is now released, springs 8 and 12 are recover and force latch 5 once again to protrude with with respect to the terminal elements 3 and 4.

The lock represented in figures 1 to 12 of the drawings further comprises a latch assembly not of hit, which comprises a latch 15 not hit. Latch 15 does not suddenly it is provided with a projection 16 located in a groove elongated 2a of the closing plate 2 for a guiding movement of latch 15 not closing. A bolt 17 stands out from the other side of latch 15 and is inserted in an elongated slot 1b of the box 1, again for a guiding movement of the latch. Multiple retainers 24 and separators 27 are mounted particularly with respect to a bolt 26 that is fixed to the box, each retainer and separator having an end slot 24a open through which the projection 16 is inserted. About soft springs 25 fixed to each of the retainers 24 are supported on a bolt 19 of the box 1, said springs serving to force the respective retainers to a position in the which projection 16 is inserted in the respective notches 24b of each of the slots 24a in the non-locked position of the non-strike latch assembly as shown in the figure 2. A lever 18 for prolonging the movement of the latch is articulated mounted on bolt 19 for a purpose that is will describe later. The eyes 1c and 2c of the lock eyes aligned are arranged in the box 1 and in the closure plate 2, respectively, and a pusher 20 for the hit latch goes mounted on the circular parts of the eyes 1c and 2c.

A cam controller 21 is mounted articulated on a bolt 23 of the box 1 and is arranged to be operated by a spring 22 that is mounted on a bolt 28 in the box. Spring 22 pushes cam controller 21 to that is coupled with the pusher 20 of the strike latch so that the latch pusher fits into an existing groove 21a in the cam controller, whereby the pusher of the latch punch stays in position in unlocked state of latch as seen in figure 2. Also, as depicted in this figure, the strike latch 15 is fully retracted in state of non interlocking of the lock.

If you want to move the latch 15 to the interlocking position, first a key (not shown) on bolt pusher 20 through one of the lock eyes 1c or 2c. Turning the pusher 20 of the latch counterclockwise, as indicates with the curved arrow of figure 2 it first makes cam controller 21 rotate around bolt 23 against the spring action 22, so that the latch pusher 20 is move out of its insertion in slot 21a. A new twist of latch pusher will engage the key with the curved edges 24c of retainers 24, whereby these are forced to rotate clockwise around bolt 26, as indicated by the curved arrow of the Figure 3 to a position in which notches 24b are separated of the projection 16 and the latter is aligned with the groove 24a. Then, each retainer is left with its respective curvilinear side 24c supported by the corresponding limit or key fit, thus maintaining the alignment of the projection 16 in the slots 24a while turning the key. At the same time, pusher 20 of the latch is moved towards a notch 15b of the latch no of hit 15.

The front face 20a of the latch pusher 20 now contacts the edge 18a of the lever extension 18, as seen in Figure 3. As depicted in Figure 4, a new turn counterclockwise Latch pusher 20 clock, makes the lever of extension 18 rotate around bolt 19 and its face 18b press against a step 16a of the latch not hit 15, thus forcing that the latter moves to the left as represented in figure 4. The latch is guided in its linear movement by the coupling of bolt 17 in the elongated opening 1b of the box 1. This coupling also limits the movement of the latch in both directions. A new linear guidance is obtained when the part of the head 15a of the latch is inserted into openings of terminal plates 3 and 4. Figure 6 shows the continuation of this operation when the resulting movement of the pusher 20 of the latch is transmitted through the extension lever 18 to latch 15, which is pushed to the left as shown in the drawings

As seen in figure 5, the lever extension 18 is positioned so that it is pushed on its edge 18a on the face 20a of the pusher 20, when the pusher rotates it generates an effective straight line of "thrust" of 17 mm due to the curvy path of edge 18a when it is pushed through of rotating the rotary pusher 20 of the latch. However, the effective dimension of the straight line between edges 180a and 18b at Start of action in non-locked position is 11 mm but since the angular relationship between the contact points at 18a and 18b varies as the extension lever rotates with respect to the bolt 19, in the state of full thrust, that is, interlocking, the effective dimension between edges 18a and 18b becomes 14 mm This increase of 3 mm, added to the 17 mm already provided by The extension lever 18 is produced in a 20 mm movement communicated to the latch not at once.

In figure 7, the latch does not hit 15 ha reached its fully displaced position having moved to through the necessary 20 mm and stays still in this position since the extension lever 18 is forced to remain with its edge 18a resting on the curvilinear face 20b of the pusher 20 when the latter continues turning in direction contrary to the clockwise direction. This new rotation allows the retainers 24, pushed by their respective springs 25 and released from the key teeth, turn in the direction counterclockwise with respect to bolt 26. The projection or stop block 16 being fixed to latch 15, it has also moved about 20 mm so that it is now separated of the curvilinear edges 24c of the retainers 24, so that these are free to rotate in the opposite direction to the needles of the clock, pushed by its springs 25 to the point where its 24d edges rest against the stop block or "stud" 1b and so the latch is fully retained in the position of interlocking In this situation, the extension lever 18 is maintains its correct alignment by coupling a notch 18c with retaining block 16. Guide bolt 17, being fixed to the latch, it has reached the limit of its displacement in slot 1b of the box, preventing any movement to the left of the latch.

Figure 8 represents a unit in a state of interlocking with the latch pusher 20 that has now turned in all its extension in the opposite direction to the needles of the clock, limited by its step 20c that meshes with the edge 15b of the latch 15 while the keyhole is in and out of the key in alignment with the corresponding eyes 1c and 2c in box 1 and the closure plate 2. This alignment is maintained against rotation involuntary clockwise by the controller of cam 21. Pushed by spring 22, inlet 21 of the cam controller gears with face 20b of pusher 20 thus completing the sequence.

To unlock the non-latch latch you must insert a key into the pusher 20 of the latch and make turn said pusher by means of the key in the direction of the clockwise as seen in the drawings. The turn of the latch pusher will disengage step 20c from edge 15b of  latch, as well as the face 20b of the latch pusher with with respect to notch 21a of cam controller 21. A new rotation of the latch pusher clockwise, such as indicated by the curved arrow of figure 9 will cause the flank of the key thrust against the retainers 24. Said retainers are forced to rotate clockwise around the bolt 26 until the teeth of the key engage with the respective retainers 24 at their edges 24c forming radii of curvature respectively and give rise to a new turn of the retainers around the articulation bolt until the inlets 24a are aligned with the stop block or upright 16 as seen in figure 10. The latch no of closure is not already retained and, at the same time, face 20d of the pusher 20 moves to contact a face angled 15 c of latch 15.

A new twist of the latch pusher will make that the latter move to the right, as seen in the drawings. In this case, the latch is actuated directly by the pusher instead of by the extension lever as in the interlocking sequence and extension lever 18 is now controlled by the latch on the coupling faces 18b and 16a, respectively, so that the extension lever 18 is spins counterclockwise around bolt 19 as indicated in figure 11, when the bolt is removed from knock.

Figure 12 depicts bolt 15 not hit in its fully retracted position with the angular face 15c of the latch engaged with the curvilinear face 20b of the pusher 20 and, since the guide bolt 17 of the latch has reached the limit of the slot 16 of the box, the latch remains in this position while the latch pusher continues to rotate in clockwise The retainers 24 are released from the teeth key lifts and, under the action of springs 25, pivot counter clockwise until notches 24b of the slots 24a engage with the stop block or upright 16, thus keeping the latch in its fully withdrawn position or unlocked

A new clockwise rotation of the latch pusher returns it to the position represented in the Figure 2, in which it is aligned with the eyes 1c, exit 2c and key entry in the box and in the closing plate respectively, and the curvilinear face 20b of the pusher of the latch is inserted into recess 21a of cam controller 21 against the action of spring 22, to prevent any rotation involuntary clockwise, thereby Complete the sequence. Improper rotation is prevented in the direction counter clockwise of the latch pusher by step 20e of the pusher that meshes with a 18d curved termination of the extension lever, as seen in figure 2.

Turning to figures 13 and 14, the lock cylinder driven represented in said figures differs from the lock shown in figures 1 to 12, in which the latch 15 is replaced by a latch assembly comprising a head 35a and a body 35b. A bolt 37 is fixed to the body 35b and is It is located in an id slot of the box 1. A lever extension 38 is articulated mounted on a bolt of joint 39 that is fixed to the box 1. On its tip opposite, the curved path of an edge 38a of the lever of extension overlaps the sweep of the operating arm or "cam" 40a of a conventional inner body cylinder 40 unit rotary. Cam 40a produces the same effect as pusher 20 of the latch in the release version as for moving the latch from the unlocked position to the locked position, the cam 40a acts against the edge 38a of the extension lever 38 and an edge 38b of the extension lever itself acts against a step 36a of the latch head 35a. So, when the 40th cam of the cylinder is spun even more counterclockwise, as indicated in figure 14, the extension lever is forced to turn even more clockwise and geometry changing between all the contact points provides the increased amount of shift left to the latch, just in the version with retainers. Similar of the version with stops, also in this version powered by a cylinder the latch 5 is operated only by the lever extension 38 in action from the unlocked position to the nailed position, then being returned to the position unlocked by the clockwise rotation of the cylinder cam, as with the pusher of the 0 latch in the multiple version retainers The cylinder 40 is retained in the box by a screw 40h through a hole 40c on one side of the box 1 and through a guide 40e inserted into a threaded hole 40g of the cylinder 40. The guide piece 40e is provided with extensions sides 40f that fit respectively with slots 1f and 2f of the box 1 and the closing plate 2.

The non-strike latch assembly incorporates also a detention or "amount" 36 but, since the "difference" of the system is now a function of the mechanism of rotating cylinder, only a single retainer 44 is needed to stop the latch at each end of its movement. The retainer 44 is articulated mounted on a bolt of pivoted 46 which is fixed to the box, a spacer 47 being provided between the body 35b of the latch and the retainer 44, the separator similarly mounted articulated with respect to the articulation bolt 46. ' A spring 45 acts on the retainer 44 pushing it counterclockwise so that the stop block or stud 36 is inserted in a notch 44b of the retainer 44 in unlocked position of the latch shown in Figure 14. One end of spring 45 is fixed to retainer 44 and the other end is supported against a bolt 45a mounted in the box 1. The separator 47 is provided with a slot 47a to receive the stop block or stud 36 but in this case it has not been arranged a notch in the separator.

When cam 40a is rotated in direction contrary to the schedule to move the latch assembly as indicated by the curved arrow of figure 15, moves towards a notch 35d of the body 35b of the latch and rests against the retainer 44 which is made to articulate clockwise until the point at which a groove 44a aligns with the stud or block stop 36 of the body 35b of the latch. Once it has reached said alignment, cam 40a starts to contact a specially curved edge 44c of retainer 44, so that it maintains alignment while the latch moves as indicated in figures 15 to 17.

When the latch is fully located in a locked position, represented in figure 18, a new counterclockwise rotation of cylinder 40 puts the cam 40a in position where it no longer rests on the curved edge 44c of retainer 44, allowing the latter to pivot in counterclockwise, pushed by spring 45, while that the latch assembly is held still by permanence that occurs when the edge 38a of the extension lever 38 is  contacted by a curved edge 40b of cam 40a and the bolt of guided 37 fixed in the body 35b of the latch reaches the limit of the opening ld of the box 1. At the same time, since the cam 40a has moved away from the curvilinear edge 44c of the retainer 44, the spring 45 serves to push the retainer in direction contrary to the schedule, so that an edge 44d of the retainer gear behind projection 36, as seen in Figure 18. In this position, a protrusion 44e of the retainer 44 is within the circular path or "sweep" of the cylinder cam 40a with in order to limit the counterclockwise turn of cam 40, as it is indicated with dashed line in figure 19 and thus prevents the retainer rises improperly.

In order to remove the latch to the position unlocked, cylinder cam 40a must be rotated by a key inserted in the cylinder 40 clockwise. In this case, the curvilinear edge 40b of the cylinder cam 40a will engage with the curvilinear edge 44c of retainer 44 to raise said retainer so that its edge 44d rises apart from the projection 36. A new rotation of cam 40a will cause a face to engage oblique 36b of the body 35b of the latch and will make the whole of the latch is removed since the projection 36 is now aligned with slot 44a of retainer 44. Cam 40a continues to move the latch assembly to the right until the cam contacts with the face of the boss 44e of the retainer. At this point, the projection 36 is aligned with the groove 44b of the notch 44a of the retainer. A new rotation of cam 40a causes the retainer pivot counterclockwise, aided by spring 45 until the cam moves away from the end of the boss 44e of retainer. The insertion of the projection 36 in the notch 44b is arranged so that the protrusion 44e of the retainer is now located off the path of cam 40a, as indicated in the figure 14.

The cam must be returned to the position shown in figure 14 before the key can be removed of cylinder 40. If the key is not removed, cam 40a of the cylinder it can be turned further clockwise to operate a linkage mechanism between the cylinder and the latch.

As shown in Figure 13, the spacer 14 of the retainer version has been replaced by a follower exterior 34 having an upper protruding arm 34a and a link 34b provided at its end with a hole intended to receive a joint bolt 54. Follower 34 is mounted on the follower 11 but in this case, follower 34 has a perforation 34c that fits with a projection 11c of the follower 11, which limits the articulation movement of the follower 34 with respect to the follower  11. In the position represented in Figure 20 of the drawings, the 11c projection gears with the upper end of the perforation curved 34c.

On the articulation bolt 54 it is mounted articulated form a link 55 from the cylinder to the latch and in its lower end, said link is provided with a part with a tooth 55a that is located on the path of cam 40a of cylinder in unlocked position of the latch. If it spins more cylinder cam 40a clockwise from the position in that the latch assembly is fully removed, as appreciate in figure 14, up to the position represented in the Figure 20, the cam contacts the part 55a of the link 55. The link is located in an incoming part 35c of the head 35a of the latch and is pushed upwards by the contact of part 55a with cam 40a. Upward movement of link 55 causes follower 34 to turn clockwise, in by virtue of the connection to the link by the articulation bolt 54 which causes arm 34a to move body 6 to the right to retract the head of the strike latch 5 as indicated in the Figure 21. In this position, follower 34 has moved with with respect to the follower 11 so that the lower end of the 34c curved drilling gears now with the other side of the outgoing 11c.

Once the head 5 of the blow latch is a door equipped with the lock has been opened and opened, cam 40a can be returned to the vertical position represented in Figure 14 and the key can be removed. Spring 8 will act on  the follower arm 34a to return it to the position represented in figure 20 of the drawings and link 55 will also return, in by virtue of its attachment to the outer tracker 34 by the bolt of joint 54.

The arrangement is such that, if the latch has been put in locked position, the cylinder-latch link does not works. Link 55 is provided with a projection 55b which is is in the way of the projection or stop block 36 so that when the latch is pushed into the locked position, the projection or stop block 36 makes contact with projection 55b to move link 55 out of the way of cam 40a of cylinder, as shown in figure 22, articulating the link around pivot bolt 54. Thus, the rotation of cam 40a does not It has an effect on link 55 or the strike latch.

On the contrary, when the latch does not hit withdraws to the unlocked position, the latch engages the link 55 to return it to the position represented in the figure 20 in which the projection 55a is located on the cam path 40a of the cylinder.

Compression spring 12 acts only against the arm 11a of the follower 11 of the latch to return the movement from the outer handles through the section stem square. Like the function of the two springs 8 and 12 are partially independent the result is that the head of the latch and cylinder-latch action may be Slightly conditioned when the external handles action / latch may be conditioned harder. Spring compression 8 acts against the strike latch 6 on its face 6a, of way that returns the set to the locked position when the manual force of the key / cylinder is interrupted. So analogous, if a door provided with a lock according to the invention it is pushed for closing, it just needs to overcome the force of the spring 8 by the movement of the head 5 of the latch when close the door. The bolt 10 that is fixed to the box not only serves to guide the linear movement of the latch assembly and to limit its displacement, it also works as position limiter for the 11th and 34th arms of the followers 11 and 34, respectively, in the situation nestled when those they rest against bolt 10 under the action of springs 8 and 12.

In order that, according to the invention, the locks can be used for doors that open to the left as for doors that open to the right, head 5 of the closing latch by blow can be reversed in one or both of the embodiments described above. To reverse head 5 of the latch only the screws 7 need to be removed to release the head of the body latch 6 and change the position of said head. The head is provided with holes 5a on both sides to properly place screws 7 for this purpose. 2b openings of the closing plate 2 allow access to the screws 7 from the outside of the lock, so it is not necessary to open the lock case in order to reverse the head of the latch.

The mechanism described above is intended mainly to its use in the established sizes of boxes of mortise lock, but can be used in several other situations. As will be appreciated from the foregoing, the lever of extension that allows increased displacement of the latch, Can be used for both multi-lever stop locks as in cylinder-operated locks with only small dimensional variations. It only takes more than one part additional, namely the extension lever with respect to the most conventional locks.

The invention is not limited to embodiments. described above, but modifications can be made and variations without departing from the scope of the invention, as described in the claims.

Claims (8)

1. A lock for a door or the like, which has a box (1) and a latch assembly comprising a latch (15, 35a) and an actuator mechanism comprising a rotating cam (20a, 40a) that is intended to be operated by a key, in which a lever (18, 38) is arranged between the actuator mechanism and the latch (15, 35a) and is arranged so that, when the actuator mechanism operates the lever to move the latch from an unlocked position at a locked position, the configuration of the lever is such that additional movement is imparted to the latch to increase its displacement, the lever (18, 38) being articulated mounted on a rod (19, 39) mounted on the box (1) and the lever (18, 38) being arranged to be touched by the cam during the latter's rotation to move the latch to the locked position, pivoting the lever around the bolt (19, 39) and increasing the lateral movement or displacement of the pest illo, the lever being arranged so that it has no effect on the movement of the latch from the locked position to the unlocked position, characterized in that the lever makes contact with a surface of the latch when it moves it to the locked position and because the lever is located by complete inside the lock case in both the locked or unlocked positions of the latch. 2. A lock according to claim 1, characterized in that the lever is configured so that when it is contacted by the cam during rotation of the latter and makes contact with the surface of the latch to move it to the locked position, the articulation movement is such that it increases the lateral movement or displacement of the latch by at least 3 mm. 3. A lock according to claims 1 or 2, characterized in that the lock comprises a mortise lock having multiple retainers (24) to immobilize the latch in any of its locked or unlocked positions, the retainers being mounted articulately on a bolt (26 ) fixed to the lock case and each retainer having a first notch (24b) that can engage with a projection (16) of the latch (15) to retain it in the unlocked position and a second notch (24d) geared with the latch to retain it in locked position, and because the cam is arranged on a pusher (20) of the latch and is inserted into a groove (15d) of the latch (15) in order to move it from the unlocked position to the locked position, initially moving the rotation of the cam retainers (24) to a position where the first notches (24b) are out of contact with the projection (16) of the latch to allow it moves towards the locked position, and when the latch has moved towards the locked position, the projection being thus positioned so that the second notches of the retainers can engage, the retainers being pushed until their contact with the cam and the projection of the latch by respective springs (25). 4. A lock according to claim 3, characterized in that means are provided for immobilizing the cam in the locked and unlocked positions of the latch, the cam immobilizing means preferably comprising a lever (21) pushed by a spring which is articulated mounted in the box (1) said lever having a notch (21a) in which the cam (20a) can be inserted. 5. A lock according to claims 1 or 2, characterized in that the lock comprises a cylinder lock incorporating the cam (40a) and because the lock comprises a retainer (44) which is articulated mounted in the box, the retainer having a first notch (44b) that can be combined with a projection (36) of the latch to retain it in its unlocked position and a second notch (44d) conjugable with the latch to retain it in its locked position, and in which the cam (40a) can be inserted into a notch of the latch (35) to move it from the unlocked position to the locked position, initially moving the cam rotation of the retainer to a position in which the first notch is out of contact with the protrusion of the latch to allow it move to the unlocked position and, when the latch has been moved to the unlocked position and, the projection being in a position where it can fit at the second notch in the retainer, the retainer being pushed to contact the cam and the projection of the latch by a spring (45). 6. A lock according to claim 5, characterized in that the lock further comprises a blow latch (5) and a cylinder / blow latch assembly, the arrangement being such that, if the cylinder (40) is operated to cause the cam (40a) turn to remove the latch (35) from the locked position, a new rotation of the cam serves to retract the strike latch (5) by means of the cylinder-strike latch assembly. 7. A lock according to claim 6, characterized in that means are provided for moving the cylinder-bolt assembly out of contact with the cam when the latch moves to the locked position. A lock according to claim 6, characterized in that the cylinder-bolt-bolt assembly comprises a lever (55) articulated jointly by one end to a bolt assembly, provided at its other end with a projection (55a) that can be engaged. by the cam (40a), the cam (55) preferably having an additional projection arranged to be engaged by the projection (36) of the latch (35) when it is moved to the locked position, to move the projection (55a) in the other end of the lever out of the cam movement path.