EP0187104B1 - Lock with latch and auxiliary bolt - Google Patents

Description

The invention relates to locks comprising a main bolt of the half-turn type, that is to say beveled and resiliently biased at the exit from the locker, for the purpose of introduction into a keeper (closed position of the lock), an auxiliary bolt also resiliently biased at the exit from the trunk, a range linked to the strike, suitable for opposing the exit of the auxiliary bolt, means for exploiting the re-entry of the auxiliary bolt for blocking purposes of the main bolt in its extended position, and controlled means operable from one of the two sides of the lock, called the "outside" side below, suitable for returning the main bolt to the boot even when the auxiliary bolt is retracted.

Such a lock has for example been described in US Pat. No. 1,508,668.

The advantage of such locks is that it is not possible to fit the main bolt into the trunk, from the outside of the lock, simply using a thin slipped instrument between this box and the strike, as long as the auxiliary bolt is in its retracted position.

It should be noted that such an advantage could not be obtained with a lock in which it would be the exit of the auxiliary bolt, and not its reentry, which would be used to block the main bolt in its extended position.

With the known embodiments of locks of the type considered, opening the lock from the outside constantly requires the use of a key or other device under control such as a coding keyboard or a magnetic card.

However, there are numerous applications for which it is advantageous to be able to authorize certain users to control the opening of the lock, during certain periods, by simple actuation of an external control handle, such actuation being on the contrary rendered inoperative. outside of said authorization periods: each of the authorization periods in question can for example be initiated by pressing a simple electric push button by an authorized person located in a room inaccessible to the users concerned, but in a place from this room from where she can see and identify these users, or by the introduction, by such a user, of a magnetic card coded in an appropriate reader connected to the lock, and the end of such a period authorization can then be determined by simply closing the lock following its opening.

It is precisely the essential aim of the invention to allow such commands.

To this end, the locks of the type in question are essentially characterized according to the invention in that they also comprise an auxiliary strike secured to the main strike and suitable for receiving the auxiliary bolt when the door is closed, a constituent plug. of the above range, plug suitable for moving in the auxiliary strike between two stable positions corresponding respectively to the release and the plugging of this strike, means, preferably electric, to move this plug from one to the other from its two stable positions and vice versa, an external control handle and a connecting mechanism capable of kinematically linking this handle to the main bolt so that an actuation of the handle results in a retraction of the two bolts if they have come out both and on the contrary is inoperative vis-à-vis the main bolt as long as the auxiliary bolt is in its retracted position or s only partially out.

• les deux pênes sont reliés entre eux par un mécanisme d'entraînement agencé de façon telle que, lorsque ces deux pênes sont sortis, la rentrée du pêne principal dans le coffre entraîne celle du pêne auxiliaire, mais avec un retard suffisant pour que cette dernière rentrée n'entrave pas celle du pêne principal,
• dans une serrure selon l'alinéa précédent, le pêne auxiliaire est plus court que le pêne principal,
• dans une serrure selon au moins l'alinéa qui précède le précédent, le mécanisme d'entraînement du pêne auxiliaire par le pêne principal est tel que le déplacement du second soit plus rapide que celui du premier et que les fins des rentrées des deux pênes soient simultanées,

In preferred embodiments, use is also made of one and / or the other of the following arrangements:

• the two bolts are connected together by a drive mechanism arranged in such a way that, when these two bolts are out, the re-entry of the main bolt into the boot causes that of the auxiliary bolt, but with a delay sufficient for this latter re-entry does not hinder that of the main bolt,
• in a lock according to the preceding paragraph, the auxiliary bolt is shorter than the main bolt,
• in a lock according to at least the paragraph preceding the previous one, the mechanism for driving the auxiliary bolt by the main bolt is such that the displacement of the second is faster than that of the first and that the ends of the returns of the two bolts are simultaneous,

the holding mechanism comprises a blocking stop carried by a link which is permanently elastically urged towards an angular position for which this stop is on the re-entry path of the main bolt, this rod being mounted so as to be constantly urged in the opposite direction from the previous, towards a position authorizing the re-entry of the main bolt, by the spring which biases the auxiliary bolt at the outlet, and the connection mechanism interposed between the outer handle and the bolts comprises an arm angularly integral with the handle and a slide actuable by this arm and linked to the main bolt,

the rod carrying the blocking stop is actuated by the spring which biases the auxiliary bolt at the outlet by means of a lug secured to this auxiliary bolt and of a lever bearing on the one hand against this rod constantly and on the other hand against this tab only when the auxiliary bolt is completely extended or almost completely removed from the trunk,

the holding mechanism is arranged so as to break the continuity of the connecting mechanism when the auxiliary bolt is retracted,

the lock comprises, in addition to the above external control handle, an internal control handle and these two control handles are coaxial and separated axially from each other by an intermediate pad mounted crazy on a support secured to the lock safe, tablet preferably constituting the common bottom of two buckets open to the two sides of the lock,

a lock with two handles according to the preceding paragraph, comprising, in the manner defined above, a connecting rod carrying a locking stop and a slide, further comprises an arm angularly integral with the interior handle and a crew actuable by this arm , a crew comprising on the one hand a heel capable of interacting with the link so as to push the stopper back into its unlocked position, that is to say outside the path of re-entry of the main bolt and on the other hand a range suitable for interacting with a range of the slider for the purpose of hooking said crew on this slider at least as soon as the heel has reached its position corresponding to the release of the main bolt,

a lock comprising, as defined above, a connecting rod carrying a blocking stop and a slide, further comprises a rotary bit mechanism controlled by a key and an intermediate mechanism itself comprising a tab suitable for being driven by the bit , first means linked to this tab and suitable for pushing the locking stop in its unlocking position and second means for connecting said tab to the slide at least as soon as the first means have released the main bolt.

The invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.

In what follows, we will describe preferred embodiments of the invention with reference to the accompanying drawings in a manner of course not limiting.

FIGS. 1 to 3, of these drawings, show a portion of a lock established according to the invention, cover removed, in three distinct situations corresponding respectively: the first, in the closed state of the lock with its two bolts extended, situation which allows opening by simple actuation of the external handle; the second, in the open state of said lock; and the third, in its closed state with blocking of the external handle due to the retraction of the auxiliary bolt.

Figure 4 shows other portions of the same lock.

Figures 5 and 6 are sections of said lock respectively according to V-V and VI-VI, Figure 1.

Figures 7 and 8 show respectively in side view and in perspective view two variants of locks also established according to the invention.

In each case, the lock comprises, on the one hand, a trunk 1 secured to a headrest 2 crossed by a main bolt 3 and by an auxiliary bolt 4 and, on the other hand, a housing comprising a main keeper 5 suitable for receiving contiguously the main bolt 3 for the purpose of "closing" the lock and an auxiliary strike 6 suitable for receiving the auxiliary bolt 4.

For the sake of clarity, it will be assumed in the following, when describing the lock illustrated in FIGS. 1 to 6, that the two bolts are arranged vertically one above the other and move horizontally, but it goes without saying that the lock in question can be oriented differently.

The main bolt 3 is of the half-turn type, that is to say beveled with a flat or curved ramp and it can be the same for the auxiliary bolt 4 although this is not essential, as specified below.

The main bolt 3 comprises a tail 7 guided horizontally between two idle rollers 8 and 9, the axes A and B of which are linked to the boot and it is constantly stressed at the outlet from the boot 1 by a helical compression spring 10 surrounding a horizontal baluster 11 secured to the trunk.

The auxiliary bolt 4 comprises a tail 12 terminated by a folded fork 13 and it is guided horizontally by overlapping, by this fork, of a horizontal column 14 secured to the trunk.

This auxiliary bolt 4 is constantly stressed at the outlet from the trunk 1 by a helical compression spring 15 surrounding the baluster 14.

The role of the auxiliary bolt is as follows: its position retracted into the boot automatically ensures the locking of the main bolt in its extended position, whether the output of the latter has occurred before or after the retraction of the auxiliary bolt.

• un doigt de blocage 16 porté par une biellette 17 montée pivotante autour d'un axe fixe C lié au coffre, doigt susceptible de se trouver sur la trajectoire de rentrée de la queue 7 pour certaines positions angulaires de la biellette dites "de blocage" ou au contraire hors de cette trajectoire pour d'autres positions angulaires de ladite biellette, dites "de déblocage",
• un ressort de torsion 18 sollicitant constamment la biellette vers ses positions angulaires de blocage,
• et un levier coudé 19 monté pivotant autour d'un axe fixe D du coffre.

The blocking mechanism includes:

• a locking finger 16 carried by a rod 17 pivotally mounted about a fixed axis C linked to the trunk, finger likely to be on the re-entry path of the tail 7 for certain angular positions of the rod called "blocking" or on the contrary, outside of this trajectory for other angular positions of said rod, called "unlocking",
• a torsion spring 18 constantly urging the link towards its angular locking positions,
• and a bent lever 19 pivotally mounted about a fixed axis D of the trunk.

For the extended position of the auxiliary bolt 4 (fig. 1) one end of the bent lever 19 bears against a folded tab 20 of the tail 12 and the other end of this bent lever 19 bears against the link 17 so as to maintain in an unlocked position: for this purpose, the force of the spring 18 is chosen so as to be overcome by that of the spring 15.

If, starting from this situation, the auxiliary bolt 4 is gradually retracted by counteracting the opposing force of the spring 15, we first observe tilting of the link 17 and of the lever 19, under the effect of the relaxation of the spring 18, and this until the angular stop of the link against a part of the lock then secured to the trunk.

From this moment, which intervenes for a relatively shallow reentry of the auxiliary bolt, corresponding for example to I / 5 of its reentry stroke, the continuation of said reentry no longer has any effect on the locking mechanism 16-19 and the tab 20 deviates from the lever 19: most of the re-entry of the auxiliary bolt therefore corresponds in this respect to a dead stroke m (fig.3).

During the tilting indicated above of the link 17, the locking finger 7 crosses vertically downwards the level of the axis C of this link, which allows it to effectively play its role of horizontal blocking: in fact, when finger 16 is below this level, the horizontal thrust exerted to the right on this finger 16 tends to apply the rod 17 against its end-of-travel stop whereas, when finger 16 is above said level, the same thrust tends to return it to its release positions by angular displacement upwards around the C axis.

Means are provided so that the re-entry of the main bolt 3 into the boot 1 automatically results in that of the auxiliary bolt 4, the beginnings of these two re-entries preferably being offset by a slight delay.

These means include a slide 21 guided vertically between fixed studs 22, 23 and 24 secured to the trunk, this derneir stud 24 serving as a journal for the roller 8 above.

The slider 21 is kinematically linked to the tail 7 by an angle return bend 25 mounted pivoting about the axis A and having two forks perpendicular to each other which overlap jointly, the first, a pin 26 secured to the tail 7 and the second, a pin 27 secured to the slide 21.

This slide further comprises a pin 28 suitable for coagulating with a quarter-circle sector 29 mounted idly around the axis B and suitable for coagulating itself with a clearance j with a pin 30 secured to the tail 12.

The game j in question makes it possible to start the reentry of the auxiliary bolt 4 only after the main bolt 3 has traveled a sufficient reentry stroke so that the end of its tail 7 has exceeded the level of the locking finger 16: this delay prevents the re-entry of the bolt 3 from being blocked by the stop of its tail against this finger.

To allow however to complete at the same time the returns of the two bolts 3 and 4 in the trunk, despite this delay initially taken by the auxiliary bolt 4, the latter is given smaller dimensions than the main bolt 3 and / or a multiplier is imposed between the displacements of the two bolts, in particular by giving two different values to the transmission transmission ratio between the slide 21 and the bolt 3 and to the transmission transmission ratio between said slide 21 and the bolt 4 .

The driving of the auxiliary bolt by the main bolt even makes it possible to give the first a non-bevelled shape insofar as, of course, this shape does not hamper the control of the re-entry of the main bolt by simple stop of its ramp inclined against the corresponding keeper.

Figures 1 to 3 show at 31 an external control handle cut along its square operating rod.

As indicated above, this handle is connected to the two bolts in such a way that its simple rotation allows the main bolt 3 to be returned to the boot when the auxiliary bolt 4 is released at the same time as this main bolt and, on the contrary such a command is prevented when the main bolt is extended and the auxiliary bolt is retracted.

To this end, the main bolt is controlled from this handle 31 by means of the slide 21.

The handle 31 is angularly integral with an arm 32 angularly biased in the direction of the arrow F, by a helical tension spring 33, towards a rest position for which this arm abuts against the stud 23.

By rotating the handle 31 in the opposite direction to the arrow F, the arm 32 abuts against a pin 34 of the slide 21.

As this slide 21 is kinematically linked to the tail of the main bolt 3, the retraction of this bolt is possible, in response to a simple rotation of the handle 31, as long as the blocking pin 16 is not located on the trajectory of reentry of said bolt, that is to say as long as the auxiliary bolt 4 is fully extended or almost completely extended.

If, on the contrary, the finger 16 is in the blocking position, as a result of the retraction of the auxiliary bolt 4, the slide 21 is itself blocked, as is the handle 31.

In the embodiment described above, the re-entry of the auxiliary bolt 4 in the trunk of the lock has the effect of putting the finger 16 in its locking position and the locking of the handle 31 is ultimately ensured by the stop of the tail 7 of the main bolt against this finger 16.

It is therefore necessary that this stop is very solid and withstands the forcing attempts which may be exerted on it by subjecting the handle 31 to intense angular forces.

According to a variant making it possible to eliminate any risk of forcing of this type, the re-entry of the main bolt still possibly results in the effect explained above, but above all by a break in the kinematic connection between the handle 31 and the main bolt 3.

Such a break can be achieved in many ways, two of which are indicated below.

According to the first embodiment, the slide 21 above is split into two slides placed one against the other. These two slides can be joined together by a mobile pin which is guided, parallel to the axes A, B, C and D, in appropriate holes in the slides and which is resiliently biased against a ramp secured to the lever 19. This ramp is drawn of so that the mutual solidarity of the two slides is deleted when the auxiliary bolt 4 enters the boot and vice versa.

According to the second embodiment, there is provided on the one hand a rack on the bolt tail 7 or on the slide 21 and on the other hand a gear train in mutual engagement between the handle 31 and this rack. The pinion, of this train, furthest from the handle is mounted on a second link similar to the link 17 above, and this second link is resiliently biased towards an angular position for which the pinion considered engages with the rack. The tilting of the lever 19 above, due to the return of the auxiliary bolt 4, are then used to move the second link in the direction of disengagement and vice versa.

The lock illustrated in Figures 1 to 6 can also be opened, regardless of the position initially retracted or extended from the auxiliary bolt 4, from the simple rotation of an interior handle 35 (fig. 4) or a key outer 36 suitable for driving a bit 37, for example by means of a locking assembly of the rotating barrel type.

To this end, the handle 35 is angularly secured to an arm 38 angularly biased in the direction of the arrow G towards a rest position for which it abuts against the stud 23.

If this handle 35 is actuated in the opposite direction to the arrow G. the arm 38 abuts against a pin 40 secured to a second slide 41 (fig. 4 and 5) parallel to the slide 21 above and guided vertically by the same studs as the latter.

• un talon 42 propre à coagir avec la biellette 17 ci- dessus afin de la repousser en une position angulaire de déblocage pour laquelle le doigt 16 dégage la rentrée du pêne principal 3,
• et une butée (ici constituée par le fond d'une lumière 43) propre à coagir avec un pion 44 solidaire du coulisseau 21 de façon à accrocher les deux coulisseaux 41 et 21 l'un sur l'autre dès que le déplacement angulaire de la poignée 35 a été suffisant pour placer la biellette 17 en position de déblocage.

This slide 41 comprises:

• a heel 42 suitable for interacting with the link 17 above in order to push it back into an angular unlocking position for which the finger 16 releases the re-entry of the main bolt 3,
• and a stop (here constituted by the bottom of a light 43) adapted to interact with a pin 44 integral with the slide 21 so as to hook the two slides 41 and 21 one on the other as soon as the angular displacement of the handle 35 was sufficient to place the link 17 in the unlocked position.

In addition, a torsion spring 45 bears against the slide 41 so as to constantly urge it in the direction which separates the heel 42 from the link 17, which puts this slide 41 into abutment against the stud 24.

That said, it is understood that a simple rotation of the handle 35 in the opposite direction of the arrow G allows in all cases to bring the two bolts 3 and 4 into the trunk, the necessary sliding being released from the start of this rotation by placing the link 17 in the release position.

As regards the control by the key 36, a third slide 46 is provided parallel to the previous two and guided vertically by the same studs as the latter.

• une patte 47 propre à coagiravec le panneton 37,
• et des moyens pour accrocher ledit troisième coulisseau sur le second coulisseau 41 dans le sens de l'entraînement du second coulisseau par le troisième et non en sens inverse.

This third slide 46 includes:

• a tab 47 suitable for coagulating with the bit 37,
• and means for hooking said third slide on the second slide 41 in the direction of driving the second slide by the third and not in the opposite direction.

These means consist of two pins 48 and 49 secured respectively to the second slide 41 and the third slide 46 and by an arm 50 mounted idly around the axis of the handle 35 and extending contiguously between the two pins 48 and 49.

There is also in the third slide 46 a light 51 playing the same role as the light 43 hollowed out in the second slide 41 and of the same outline as the latter.

• entre le premier 21 et le troisième 46, de rondelles d'écartement 52 et du bras 50 (voirfigure 5),
• et entre le second coulisseau 41 et le palâtre ou fond 53 du coffre, de rondelles d'écartement 54.

The three slides 21, 41 and 46 are advantageously constituted by three overlapping plates with interposition:

• between the first 21 and the third 46, spacing washers 52 and the arm 50 (see FIG. 5),
• and between the second slide 41 and the plaster or bottom 53 of the trunk, spacing washers 54.

In the illustrated embodiment, the two outer 31 and inner 35 handles are coaxial, but they are separated axially from each other by a pad 55 (FIG. 6) mounted loosely on a support linked to the trunk 1.

This pellet 55 advantageously constitutes the common bottom of two cylindrical cups 56 and 57 open respectively towards the two sides of the lock and suitable for receiving respectively thickened portions, with cylindrical outline of revolution, of the two arms 32 and 38, portions themselves hollowed out by square holes 58.59 suitable for receiving the rods of the two handles concerned in a joint manner.

The support of the assembly formed by the pellet 55 and by the two cylindrical cups 56 and 57 which extend it comprises, in the embodiment illustrated in Figure 6, two hollow pillars 60 integral with the trunk 1 and each successively having one end set in the bottom of this box, which it crosses, a cylindrical shoulder forming a spacer and a tubular barrel. This barrel itself contiguously crosses a first plate 61 crossed by one of the buckets 57, then a washer 62 of the same thickness as the annular portion of the arm 50, which portion encircles the pellet 55, then a second plate 63 traversed by the another cup 56, then a spacer ring 64 and finally the lid 65 of the trunk.

The axes A, B, C, D and the axes of the studs 22 and 23 and the pillars 60 are all hodzontal and parallel to the common axis of the handles 31 and 35 as well as to the axis of the key 36, that is ie perpendicular to the direction of horizontal sliding of the bolts.

The inputs of the auxiliary bolt 4 into the trunk 1 and its outputs out of this trunk can be controlled in any desirable manner.

• quand le bouchon 66 est enfoncé au fond de la gâche 6 (fig. 1), le pêne auxiliaire 4 peut y pénétrer librement et donc sortir au maximum du coffre 1 sous la détente du ressort 15,
• quand au contraire le bouchon 66 occupe la gâche 6 jusque affleurer à son bord (fig. 2 et 3), le pêne auxiliaire 4 est repoussé par ce bouchon en sa position rentrée dans le coffre.

In an advantageous embodiment, these commands are provided, when said auxiliary bolt 4 is located horizontally opposite the corresponding auxiliary strike 6, by pushing this bolt using a plug 66 placed in this auxiliary strike:

• when the plug 66 is pressed into the bottom of the keeper 6 (fig. 1), the auxiliary bolt 4 can enter it freely and therefore exit the trunk 1 as far as possible under the rebound of the spring 15,
• when, on the contrary, the plug 66 occupies the keeper 6 until it is flush with its edge (FIGS. 2 and 3), the auxiliary bolt 4 is pushed back by this plug into its retracted position in the boot.

The movement of the plug 66 is itself controlled electrically from a distance, but it could also be mechanical.

The fact that the release of the main bolt 3 is controlled exclusively when the auxiliary bolt 4 is in its fully or almost completely out of the boot position allows the interval i between the boot and the strike to be given a relatively high value without inconvenience.

As a result of which, and whatever the embodiment adopted, there are finally locks whose constitution and operation are sufficiently apparent from the above.

These locks have many advantages over those previously known and in particular that of comprising an external control handle which is automatically locked when the auxiliary bolt is in its depressed position and which is on the contrary made operational by simple retraction of the auxiliary bolt in the lock chest.

• celles où, les deux pênes 3 et 4 de la serrure étant encore superposés verticalement, l'axe commun des deux poignées 31 et 35 et celui de la clé seraient disposés horizontalement côte à côte au lieu d'être superposés, comme visible respectivement en 67 et 68 sur la figure 7,
• celles où les axes des deux poignées intérieure 35 et extérieure 31 seraient décalés transversalement l'un par rapport à l'autre au lieu d'être confondus,
• celles où les axes des deux poignées 31 et 35 et de la clé seraient confondus, comme visible sur la figure 8,
• celles où les deux pênes principal 3 et auxiliaire 4 seraient imbriqués l'un dans l'autre, comme encore visible sur la figure 8, l'ensemble du mécanisme se trouvant alors avantageusement contenu, à l'exception des poignées de commande et du dispositif à clé, dans un carter cylindrique de révolution 69 propre lui-même à recevoir jointivement les deux pênes dans sa portion la plus proche de la têtière 2,
• celles où une commande par clé serait prévue des deux côtés de la serrure, ou d'aucun de ses deux côtés,
• celles où les deux poignées extérieure 31 et intérieure 35 seraient solidaires l'une de l'autre, et alors toutes deux associées, comme la poignée extérieure 31 ci-dessus, à un mécanisme de condamnation asservi à la rentrée du pêne auxiliaire,
• celles où la poignée intérieure 35 serait agencée à la façon d'une poignée anti-panique, constamment opérationnelle,
• celles où les sorties du pêne principal 3 hors du coffre 1 seraient combinées avec les déplacements d'autres pênes liés cinématiquement audit pêne 3 par des tringleries appropriées (tringleries schématisées par la flèche T sur la figure I), ces autres pênes coagissant avec autant de gâches appropriées comme bien connu dans le domaine des verrouillages de portes à points multiples,
• celles où le coulisseau actionné par le bras solidaire de la poignée extérieure (31) serait confondu avec la queue du pêne principal (3) au lieu d'être relié à cette queue par un renvoi d'angle,

As is obvious, and as already follows from the foregoing, the invention is in no way limited to those of its modes of application and embodiments which have been more especially envisaged; on the contrary, it embraces all variants, in particular:

• those where, the two bolts 3 and 4 of the lock being still superimposed vertically, the common axis of the two handles 31 and 35 and that of the key would be arranged horizontally side by side instead of being superimposed, as visible respectively at 67 and 68 in FIG. 7,
• those where the axes of the two inner 35 and outer 31 handles are offset transversely relative to one another instead of being merged,
• those where the axes of the two handles 31 and 35 and of the key would be coincident, as visible in FIG. 8,
• those where the two main bolts 3 and auxiliary 4 would be nested one inside the other, as still visible in FIG. 8, the entire mechanism then being advantageously contained, with the exception of the control handles and the device by key, in a cylindrical casing of revolution 69 which itself can receive the two bolts contiguously in its portion closest to the headrest 2,
• those where a key control would be provided on both sides of the lock, or on neither side,
• those in which the two exterior 31 and interior 35 handles are integral with one another, and then both associated, like the exterior handle 31 above, with a locking mechanism slaved to the retraction of the auxiliary bolt,
• those where the interior handle 35 is arranged in the manner of a panic handle, constantly operational,
• those where the exits of the main bolt 3 from the boot 1 would be combined with the displacements of other bolts kinematically linked to said bolt 3 by appropriate linkages (linkages shown diagrammatically by the arrow T in FIG. I), these other bolts interacting with as many suitable keepers as well known in the field of multi-point door locks,
• those where the slide actuated by the arm secured to the outer handle (31) would be merged with the tail of the main bolt (3) instead of being connected to this tail by an angle gear,

and those where the means for "maintaining the main bolt in its extended position", means whose actuation is controlled by the returns of the auxiliary bolt, would be arranged not so as to physically block the main bolt in its extended position, but so simply to neutralize the command to re-enter this main bolt by simple operation of the external handle.

Claims (14)

1. Lock comprising a principal bolt (3) of half- turn type, that is to say bevelled and elastically urged to protrude from the casing (1) of the lock, for the purpose of insertion into a clasp (5) (closed position of the lock), an auxiliary bolt (4) also urged elastically to protrude from the casing, a bearing attached to the clasp, adapted to oppose the protrusion of the auxiliary bolt, means to employ the re-entry of the auxiliary bolt for the purpose of blocking the principal bolt in its protruding position and control means actuatable from one of the two sides of the lock, called "outer" side below, adapted for releasing the principal bolt from the clasp, even when the auxiliary bolt is re-entered, characterized in that it further comprises an auxiliary clasp (6) rigidly fast with the aforesaid clasp (5) and adapted to receive the auxiliary bolt (4) on closing of the lock, a constituent plug (66) of the aforesaid bearing, which plug is adapted to be moved in the auxiliary clasp (6) between two stable positions corresponding respectively to disengagement and to plugging of this clasp, means, preferably electric, for moving this plug from one to the other of its two stable positions and conversely, an outer actuating handle (31) and a linking mechanism (21-27, 32) adapted to kinematically couple this handle (31) to the principal bolt (3) so that actuation of the handle results in a re-entry of the two bolts if they are both protruding and on the contrary is inoperative with respect to the principal bolt (3) as long as the auxiliary bolt (4) occupies its re-entered or only partially protruding position.

2. Lock according to claim 1, characterized in that the two bolts (3, 4) are coupled to one another by a drive mechanism (28-30) arranged so that, when said two bolts are protruding, the re-entry of the principal bolt (3) into the casing (1) drives that of the auxiliary bolt (4), but with a sufficient delay at the start so that this mentioned re-entry does not interfere with that of the principal bolt.

3. Lock according to claim 2, characterized in that the auxiliary bolt (4) is shorter than the principal bolt (3).

4. Lock according to anyone of claims 2 and 3, characterized in thatthe mechanism for driving the auxiliary bolt (4) by the principal bolt (3) is such that the movement of the second is faster than that of the first and thatthe ends of the re-entries of the two bolts are simultaneous.

5. Lock according to any one of the preceding claims, characterized in that the locking mechanism comprises a blocking stop (16) borne by a link rod (17) urged elastically into an angular position for which this stop is in the re-entry path of the principal bolt (3), this link rod being mounted so as to be constantly urged in the reverse direction from the preceding one, towards a position permitting the re-entry of the principal bolt, by the spring (15) which urges the auxiliary bolt (4) to protrude, and in that the linking mechanism interposed between the outer handle (31) and the bolts comprises an arm (32) angularly fast to the handle and a slider (21) actuatable by this arm and coupled to the principal bolt (3).

6. Lock according to claim 5, characterized in that the link rod (17) bearing the blocking stop (16) is actuated by the spring (15) which urges the auxiliary bolt (4) to protrude through a lug (20) fast to this auxiliary bolt and a lever (19) bearing on the one hand against this link rod constantly and on the other hand against this lug only when the auxiliary bolt is fully protruding or almost fully protruding from the casing.

7. Lock according to any one of the preceding claims, characterized in that the locking mechanism is arranged so as to break the continuity of the coupling mechanism when the auxiliary bolt (4) is re-entered into the casing.

8. Lock according to any one of the preceding claims, characterized in that it comprises an inner actuating handle (35) and in that the two actuating handles (31, 35) are coaxial and separated axially from one another by an intermediate pellet (55) loosely mounted on a support fast to the casing of the lock, said pellet constituting preferably the common bottom of two sockets (56, 57) open towards the two sides of the lock.

9. Lock with two handles according to any one of claims 5 to 8, characterized in that it comprises an arm (38) angularly fast to the inner handle (35) and a mechanism (40-44) actuatable by this arm, comprising on the one hand a heel (42) adapted to coact with the link rod (17) bearing the blocking stop so as to urge back this stop into its unblocking position, and on the other hand a bearing (43) adapted to coact with a bearing (44) of the slider (21) for the purposes of coupling said mechanism to said slider at least as soon as the heel has arrived in its position corresponding to the unblocking of the principal bolt.

10. Lock according to any one of claims 5 to 9, characterized in that it comprises a rotary bit mechanism (37) actuated by a key (36) and an intercalary mechanism itself comprising a lug (47) adapted to be driven by the bit, first means (42) coupled to said lug and adapted to push the blocking stop (16) into its unblocking position and second means to connect said lug to the slider (21) at least as soon as said first means have ensured the unblocking of the principal bolt.

11. Lock with two handles according to any one of claims 1 to 7, 9 and 10, characterized in that the axes of the two inner and outer handles are offset transversely with respect to one another.

12. Lock with two handles according to any one of claims 1 to 10, actuatable by a key from at least one of its two sides, characterized in that the axes of the handles and that of the key are all merged.

13. Lock according to claim 12, characterized in that the two principal (3) and auxiliary (4) bolts are interlaced in one another and in that the whole of the mechanism, with the exception of the handles and the key device, is contained in a cylindrical casing of revolution (69) adapted to receive adjacently the two bolts in its position closest to the faceplate (2).

14. Lock according to any one of the preceding claims, characterized in that the protrusions of the principal bolt (3) from the casing (1) are combined with the movements of other bolts kinematically coupled to said bolt by suitable linkage systems (T).

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