EP0215383A1 - Safety lock - Google Patents

Abstract

The safety lock has a housing (1) receiving a lock cylinder and an approximately central recess (9) for a rotational movement of a key bit (15). To increase the degree of safety against break-in, the recess (9) extends essentially only in the cylindrical housing part (2), and the housing (1) has a cross-sectional weakening (26) as a predetermined breaking point at at least one of its ends. The key bit is designed so that it can be inserted and withdrawn. <IMAGE>

Description

The invention relates to a security lock with the features of the preamble of independent claims 1, 4 and 6.

Such security locks are known. The lock bit of these known security locks can be rotated about its axis with the help of the key. Apart from this rotary movement, the lock bit is rigid. In particular, it cannot be moved or pivoted in the radial direction. Therefore, in the prior art, the recess must also tangibly extend into the fastening part of the housing of this known security lock, in order to make room for the rotary movement of the locking bar. However, the associated material weakening of the housing represents a tangible security risk because unauthorized persons can easily break through the housing at this weak point, which runs approximately in the center, with the aid of a suitable tool, which then creates free access.

The invention avoids these disadvantages. It is based on the task of proposing a security lock with the features mentioned at the outset, which is distinguished by a noticeably increased security.

In a first embodiment of the invention, the characterizing features of claim 1 serve to achieve this object. Accordingly, the recess in the housing practically only extends in its cylindrical part, because namely the actuating pin which actuates the bolt can be moved in and out in the radial direction. In its actuated position it is pressed outwards by the spring until it stops and can then carry out its usual actuation of the striking plate or bolt. If you turn the cylinder further with the help of the key and thus also via the pin housing, the head finally comes to rest on the control cam, which runs in such a way that it moves the actuating pin into its inactive position from the outside inward with a further rotary movement leads. The head or the free end of the pin then passes over the now filled part of the cylindrical housing part, where it assumes its inwardly displaced position, in which it practically does not protrude beyond the diameter of the actual locking cylinder. If you turn it further, the guide curve recedes again, so that the actuating pin is finally guided outwards into its active position again by the spring. This movement can be carried out in both directions of rotation, and also from both sides of the door lock.

Another weak point of known security locks is that the housing with its locking cylinder protrudes a certain distance over the door, so that the housing can be broken out with a suitable tool. In order to also prevent this possibility of break-in, it is preferred if the housing has a cross-sectional weakening at at least one end, preferably at both ends. A burglar is now attacking with pliers or another suitable tool at the protruding end, the housing breaks off in the area of the cross-sectional area, which therefore forms a predetermined breaking point. Then there is no longer a housing part and the lock can no longer be removed.

On both ends of the pin housing, slot-like recesses are provided, into which the key is inserted at one end or the other to actuate the key, so that the pin housing and thus also the actuating pin can then be rotated. In order to ensure that when the key is inserted, the pin housing and thus also the actuating pin is in the correct position, it is preferred if a spring-loaded pin is inserted into the inner end face of at least one of the locking cylinders, which pin is opposite a recess in the pin housing. As a result, the pin housing is locked in its correct position, so that the lock can be operated with the key. These measures do not weaken the housing because the pin is provided in the locking cylinder, not in the housing, as is also possible per se, but combined with a cross-sectional weakening of the housing.

In the first embodiment of the invention explained above, the locking bit is radially displaceable, specifically via a control cam attached outside the locking cylinder. In the case of existing locks, these must therefore be retrofitted with this control cam, which is time-consuming.

To avoid this disadvantage, you could use the tax Lay the curve inside the locking cylinder and form it on the locking cylinder itself.

A second, but still more preferred embodiment of the invention is characterized by the characterizing measures of claim 4 to solve the problem of the invention. Here, as in the first embodiment, the disadvantageous predetermined breaking point in the central part of the housing is avoided because the housing is sufficiently stable in this area due to a noticeable reduction in the size of the recess, so that it no longer breaks when attempting to break in. The lock bit is moved by a suitable guide so that, despite this filling of the recess, it can rotate through a full angle, in which case it is retracted into the profile of the locking cylinder in the region of the recess while it is in the engagement region with the recess of the The striking plate protrudes so far that the striking plate can be actuated (opened or closed).

The necessary retraction or extension of the locking bar into the profile of the locking cylinder or out of it can be done in several ways, for example by a displacement essentially in the radial direction, or also by a pivoting movement. It is preferred if, according to claim 7, the locking bit is guided and pivotally held in a recess in the pin housing in a spring-loaded manner.

A very important embodiment of the invention is characterized according to claim 6, characterized in that the housing has a cross-sectional weakening at at least one of its ends. Even if the case is a bigger one Has recess according to the prior art can be prevented by these measures, if necessary, that the housing breaks in the middle in the event of a break-in attempt, rather it will then break there with a corresponding design of the cross-sectional weakening at the end of the housing, which in turn prevents a break-in attempt . This important embodiment of the invention is naturally preferred if, according to claim 1 or 4, the recess is provided essentially only in the cylindrical housing part, it then being necessary to take suitable measures to ensure that the locking bit has the above-described retracting or extending movement during its rotational movement carries out.

If, as is the case in the described second embodiment of the invention, the lock bit is pivotally held in the recess of a lock bit housing, care must be taken to ensure that this pivotable lock bit becomes active both when closing and when opening the lock.

The features of claim 8 serve to solve this problem.

The partial mustaches would interfere with each other in their closing movement, unless special measures are taken to ensure that the non-active partial locking bit remains in its retracted position until it is to be activated. The features of claim 9 are used to solve this sub-problem, a space-saving solution being proposed at the same time because the pin mentioned there is in the axial direction of the security lock extends.

For reasons of space, it can happen that the two control cams provided for this purpose, namely a control curve for the one partial cam, and the other control curve for the other partial cam, cannot extend over a sufficiently large angle, because then proper functioning will not be possible would be more. It should be mentioned that both control curves are designed as partial circles with different radii. The features of claim 10 then serve to solve this sub-problem.

Such a security lock should be able to be closed from both sides, ie from the inside and from the outside of the door. It is therefore necessary to ensure that only the pair of control cams that is now required becomes active during the respective closing movement. For this, claim 11 proposes a structurally simple and particularly space-saving solution, which ensures that when closing from the outside the outer lock cylinder is coupled to the lock cylinder and these two coupled parts move relative to the stationary inner lock cylinder, which then causes the relative movement between the Pins and the control curves. When the security lock is actuated from the inside, the situation is reversed, ie the inner lock cylinder is then coupled to the lock bit cylinder and the two control cams of the outer lock cylinder, which is stationary, become active.

The necessary displacement of the coupling piece takes place automatically, caused by the insertion of the key into the lock from the relevant (inner or outer) side. See claim l2.

Previously, a burglar could use the so-called corkscrew method to drill into the lock cylinder of a security lock and pull it out to the front, which made the lock bit or striking plate freely accessible. To prevent this, the measures according to claim l3 are provided, which prevent the locking cylinder from being pulled out to the front with certainty, even when the locking cylinder is drilled.

The key channels of known security locks have a relatively complicated profile with acute angles. Such a key channel can only be produced with very complex machines. In addition, in the case of known security locks, no effective precaution is taken against boring the cylinder core. Although pin tumblers with a steel insert as drilling protection have already been proposed here, they do not work effectively, in particular because they extend perpendicular to the key channel.

The features of claim 14 serve to solve this problem.

The features of claim l5 also ensure that the profile channel can be made with relatively simple tools, because it consists of a substantially rectangular profile, which receives its individuality in that the profile strips according to claim l4 are used at predetermined points.

To prevent unauthorized sliding out of the profile strips from their holes, they are inserted into the holes in a snug fit, the hole possibly tapering slightly forward. The profile strips can have hooks which also prevent the profile strips from being pushed out of their bores. The bores can also be designed as blind bores, which also effectively prevents unauthorized sliding of the profile strips out of their bores.

• Fig. l - perspektivisch und in auseinander gezogener Darstellung die wichtigen Bauelemente eines erfindungsgemäßen Sicherheitsschlosses in einer ersten Ausführungsform;
• Fig. 2 - eine Stirnansicht des Sicherheitsschlosses mit Schließblech und Steuerkurve in ver­größertem Maßstab;
• Fig. 3 - eine Seitenansicht des Gehäuses;
• Fig. 4 - eine Draufsicht auf das Gehäuse;
• Fig. 5 - abermals eine Seitenansicht des Gehäuses;
• Fig. 6 - eine Stirnansicht des Gehäuses;
• Fig. 7 - eine Seitenansicht des Zapfengehäuses;
• Fig. 8 - eine Ansicht eines der beiden Teile des Zapfengehäuses;
• Fig. 9 - eine Ansicht des anderen Teiles des Zapfen­gehäuses;
• Fig. l0 - eine Stirnansicht von Fig. 8;
• Fig. ll - eine Stirnansicht von Fig. 9;
• Fig. l2 - eine Seitenansicht eines Schließzylinders mit Zapfen;
• Fig. l3 - eine Stirnansicht von Fig. l2;
• Fig. l4 - perspektivisch die wesentlichen Bauelemente der zweiten Ausführungsform des erfindungsge­mäßen Sicherheitsschlosses mit verschwenkbaren Teil-Schließbärten;
• Fig. l5 - eine Draufsicht auf die beiden aneinander anliegenden Teil-Schließbärte;
• Fig. l6 - eine Ansicht eines dieser Teil-Schließbärte;
• Fig. l7 - schematisch die beiden Teil-Schließbärte mit Feder, Steuerkurven und Schließbartgehäuse sowie dem Befestigungsteil des Gesamtgehäuses in einer Lage, in der die beiden Teil-Schließ­bärte eingefahren sind;
• Fig. l8 - die Situation von Fig. l7 nach einer Verdrehung um etwa 90° im Gegenuhrzeigersinn;
• Fig. l9 - die Situation von Fig. l8 nach einer weiteren Drehung von etwa 90° im Gegenuhrzeigersinn, wo­bei zusätzlich das Schließblech dargestellt ist;
• Fig. 20 - eine Ansicht der Steuerplatte mit den beiden Steuerkurven;
• Fig. 2l - eine Draufsicht auf die Steuerplatte nach Fig. 20;
• Fig. 22 - einen Mittel-Längsschnitt durch den Zylinderkern mit in seinen Schlüsselkanal eingesetzten Pro­filleisten;
• Fig. 23 - eine Stirnansicht des Zylinderkerns nach Fig. 22 von vorne her gesehen;
• Fig. 24 - eine Ansicht des Zylinderkerns von Fig. 22 von der Rückseite her gesehen;
• Fig. 25 - perspektivisch eine der Profilleisten für den Zylinderkern nach Fig. 22 bis 24;
• Fig. 26 - einen Teilschnitt durch das gesamte Sicherheits­schloß;
• Fig. 27 - eine Stirnansicht des Sicherheitsschlosses nach Fig. 26 von der Vorderseite her gesehen.

The invention is explained in more detail below on the basis of exemplary embodiments, from which further important features result. It shows:

• Fig. L - in perspective and in an exploded view, the important components of a security lock according to the invention in a first embodiment;
• Figure 2 - an end view of the security lock with striking plate and cam in an enlarged scale.
• Fig. 3 - a side view of the housing;
• Fig. 4 - a plan view of the housing;
• Fig. 5 - again a side view of the housing;
• Fig. 6 - an end view of the housing;
• Fig. 7 - a side view of the pin housing;
• Fig. 8 - a view of one of the two parts of the pin housing;
• Fig. 9 is a view of the other part of the pin housing;
• Fig. 10 - an end view of Fig. 8;
• Fig. Ll - an end view of Fig. 9;
• Fig. L2 - a side view of a locking cylinder with pin;
• Fig. L3 - an end view of Fig. L2;
• Fig. L4 - in perspective the essential components of the second embodiment of the security lock according to the invention with pivotable partial locking straps;
• Fig. L5 - a plan view of the two partial beards bear against each other;
• Fig. 16 - a view of one of these partial beards;
• Fig. L7 - schematically the two part-beards with spring, control cams and lock bit housing as well as the fastening part of the entire housing in a position in which the two part-beards are retracted;
• Fig. L8 - the situation of Fig. 17 after a rotation by about 90 ° in the counterclockwise direction;
• Fig. L9 - the situation of Fig. L8 after a further rotation of about 90 ° in the counterclockwise direction, the striking plate also being shown;
• 20 is a view of the control plate with the two control cams;
• Fig. 2l - a plan view of the control plate of FIG. 20;
• 22 shows a central longitudinal section through the cylinder core with profile strips inserted into its key channel;
• 23 - an end view of the cylinder core according to FIG. 22 seen from the front;
• Fig. 24 is a rear view of the cylinder core of Fig. 22;
• 25 - in perspective one of the profile strips for the cylinder core according to FIGS. 22 to 24;
• Fig. 26 - a partial section through the entire security lock;
• Fig. 27 - an end view of the security lock according to Fig. 26 seen from the front.

First of all, it should be mentioned that, for better clarification of the invention in FIG. 1, the one-piece housing is shown broken through approximately in the middle; in reality both of its parts are integral with each other. The housing 1 accordingly consists of a cylindrical housing part 2, on the underside of which a fastening part 3 of the housing connects. The fastening part has an essentially square cross section with a rounded underside. Both parts 2, 3 are of approximately the same length. Approximately in the middle of the fastening part 3 runs a threaded bore 4 transversely thereto, via which the housing 1 can be fastened to the housing of the actual lock with the aid of a threaded bolt 5, as is known per se. See also FIG. 2.

In the housing part 2, an essentially cylindrical, continuous bore 6 is created, into which locking cylinders 7 are inserted from the two end faces. These are held by locking rings 8.

A recess 9 is provided approximately centrally in the cylindrical housing part 2. In Fig. 5 it is indicated that this recess 9 has extended far into the fastening part 3 in the prior art described at the outset. This is the extension 9a of the recess 9.

According to the invention, a peg housing is inserted into the recess 9, which is shown in detail in FIGS. 7 to 11. The pin housing consists of a right plate l0 and a left plate ll. Pins l2 are provided in the left plate 11, which engage in corresponding holes l3 of the other plate. This fixes both plates to each other.

A radial guide l4 is formed between the two plates, in which a locking bit l5 designed as a pin can be moved radially. At the inner end of the locking bar there is a compression spring l6, the other end of which is supported on the housing. An extension l7 serves as a stop to limit the displacement path of the locking bar l5 along its guidance. The free end of the locking bar is designed as a widened head 18, the top of which has a circular profile. The pin is inserted in the guide against rotation via the extension l7.

On the outer end faces of the plates 10, 11, slots 19 are provided, into which the key for actuation engages.

In particular, Fig. 2 shows that in the position shown in this figure, the head l8 of the locking bar engages in a recess in a striking plate 20, so that when the cylinder and thus the locking bar l5 rotate in the direction of arrow 2l, the striking plate 20 in the direction the arrow 22 is moved. This unlocks the lock, for example. If you now turn the key further, the head 18 comes to a guide curve 23 of a guide part 24, which holds the pin at its Moves further rotation inwards until the pin and its head no longer protrude beyond the locking cylinder 7. This guide function is performed in the lower part in FIG. 2 by part 9a of the housing. If the cylinder is turned further, the pin moves outwards again. In other words, he carries out a radial movement in the direction of arrow 25.

At both ends of the housing 1, grooves 26 running all around are provided, which represent a cross-sectional weakening of the housing.

The housing part 2 has on its top side of the recess 2 widenings 27 of the recess so that the pin housing can be inserted into the housing l.

FIGS. L2 and l3 show that a spring-loaded pin 28 is inserted into one of the lock cylinders 7 and engages with its tip in a corresponding recess in the opposite plate 10, 11. As a result, the pin l5 is locked in the position shown in FIG. 2, so that when the key is inserted into the lock, it immediately assumes its correct position.

The preferred, second embodiment of the security lock according to the invention is explained in more detail below with reference to FIGS. 14 to 21.

These figures and in particular Fig. 14 shows that a lock bit housing 3l with a receptacle 32 is provided for partial locking bars 33 and 34. This part-closing Beards are also shown in FIGS. 15 and 16 in detail.

Both part-beards have through holes 35 to form a pivot axis. In the plan view of FIG. 15, they are profiled essentially in a T-shape, but with an asymmetrical arrangement of the crossbeams. Their heads 36 have a circular cylindrical outer surface. A leg spring 37 is inserted into a recess in the receptacle 32. The leg spring is pushed onto an axis which is held in a bore 38. The legs 39, 40 of the leg spring each rest on one side of the partial beards 33, 34. See in particular FIGS. L7 to l9. The bias of the spring is such that the partial mustaches are biased downwards by the legs of the spring in the view of Fig. to the mounting part 3 of the housing.

The partial locking beards 33, 34 are identical to one another. In addition to the through hole 35, they have a projection 4l. A corresponding circular recess 42 is provided at the other end of the partial locking ridges, into which the tip of the elevation 4l of the other partial locking ridge is inserted. The recess 42 is open towards the edge.

A sleeve 43 is inserted through the through hole 35, in which a locking pin 44 is inserted. The sleeve forms the swivel axis for the relevant partial locking beard and the pin 44 engages with its tip in the inactive position of the two partial locking beards shown in FIG. 17 in a recess 45 of the other partial locking beard. This recess 45 is arranged in the middle of the recess 42.

To ensure the locking, a further locking pin 46 can be provided, which is then inserted into a through hole 47 in the housing 3l and which also engages with its tip in a recess 48 corresponding to the recess 45 of the partial locking bit concerned.

FIGS. L7 to l9 now show the actuation of the safety lock during the opening process. Fig. 17 shows the starting position, in which the two part-beards 33, 34 point down to the fastening part 3 of the housing l. They lay their heads on the upper wall of the fastening part 3. The leg springs 39, 40 tension the partial closing beards downwards, i.e. in the direction of the central axis of the fastening part 3.

Fig. 18 shows the situation after the key and thus the lock has been turned through an angle of approximately 90 ° in the direction of arrow 49. It can be seen that the partial locking bit 34 has been pivoted outwards by the spring 37. In itself, the partial locking bit 33 would have been pivoted outwards by the spring. However, this is not possible, because in this angular position the locking pins 44, 46 engage with cams 50, 5l with their tips in the corresponding recesses of this partial cam 33 and also hold it in its inactive position against the force of the spring 37. The shape of the control curves 50, 5l can best be seen in FIG. 20. It also follows that the control curve 50 extends over an angle of somewhat less than extends 180 ° and has a smaller radius than the control curve 51, which similarly also extends over an angle of somewhat less than 180 °. Both control curves are designed as elevations of a control plate 52 (see Fig. 2l). The control cams thus cause the pins 44, 46 to be pressed into the recesses 45, 48 as soon as the outer ends of the pins 44, 46 ride on the control cams.

In Fig. L9 the lock was rotated by a further 90 ° in the direction of arrow 49. The pivoted-out part of the striker 34 now engages in the receptacle of the striking plate 20 and displaces it in the direction of the arrow 53, very similar to that shown in FIG. 2, but with the opposite direction of displacement.

After a further rotation by an angle of less than 90 °, the lock is closed. In this position, the locking pin in question no longer rides on its control cam and the other partial locking bit 33 is prevented from pivoting out in this angular position by the projection 4l of the partial locking bit 34 engaging in its recess 42.

The partial lock bit 34 is also held in the position shown in FIGS. 18, 19 against the resistance of the bolt 20 because its trunk rests on the widened head 36 of the other partial lock bit 33.

If it is a lock that can be closed twice, the second closing process is carried out analogously, for which the lock is first turned clockwise to that in Fig. L8 shown must rotate back until the head of the partial lock bit 34 active for the locking process engages in the adjacent recess of the striking plate 20.

To open the lock, the other partial lock bit 34 is activated. For this purpose, starting from the position according to FIG. 17, the lock is turned clockwise, the partial cam 33 then being activated, in a manner analogous to that described above. Now the inactive partial locking bit 33 is locked by the pins 44, 46 and the projection 4l and held in its inactive position.

It should be mentioned that in the pivoted-in position according to FIG. 17, the heads of the partial beardings protrude beyond the profile of the beard housing 3l. However, a ring with a recess for the movement of the heads of the part-mustaches is pushed over the beard housing, whereby the profile of the housing 3l ends with the profile of the heads.

Fig. 14 also shows one of the clutches with which the lock bit housing 3l can optionally be rotatably coupled to the adjacent locking cylinder or the adjacent control plate 52. It should be noted that such a coupling is also provided on the left in FIG. 14; it has only been left out for clarification.

The coupling consists of a coupling piece 54 with an axial pin 55. The pin 55 is inserted into a corresponding bore 56 in the housing 3l. There is also a receptacle 57 which corresponds to the shape of the coupling 54 and which is so deep that the coupling piece 54 fits into the receptacle, so that the surface of the coupling piece is flush with the surface of the housing 3l.

A corresponding receptacle 58 is formed in the control plate 52 (see FIG. 20). It should be mentioned that the control plate 52 is inserted into a corresponding receptacle 59 of the adjacent locking cylinder 7 in such a way that the two parts 52, 7 are connected to one another in a rotationally fixed manner. Cf. see Fig. 22.

If the coupling piece 54 closes off from the surface of the housing 3l, both parts 3l on the one hand and 7, 52 on the other hand can be rotated relative to one another, so that the control cams of this coupling piece then take effect. However, if the coupling piece 54 is pushed out of its receptacle 57 by an appropriate amount, approximately by half its thickness, by inserting a key into the profile channel, the two parts 3l on the one hand and 7, 52 on the other hand are thereby coupled in a rotationally fixed manner.

When the key is inserted from the other side, the same conditions result, so that the correct control cams 50, 5l are always activated. The activated control cams are non-rotatable, while the non-activated control cams rotate with the housing 3l because they are coupled in a rotationally fixed manner.

22 to 25 also show that the key channel 60 for inserting the key is formed by means of profile strips 6l, which are made of hardened steel. The profile strips have a simple profile, preferably a circular profile with attached Rectangle. On the back, a hook-like extension 62 can be provided, which prevents the profile strips from being pulled out towards the front. It can be seen that the key channel 60 has a rectangular profile and can therefore be produced using simple machines. Several of the profile strips 6l protrude from the side with their rectangular extensions into the key channel and thus form the actual key channel.

In order to prevent the cylinder core 7 from being pulled out, it has an annular shoulder 63 with which it bears against a corresponding counter shoulder 64 of the housing 1 (see FIG. 26). This prevents the cylinder core from being pulled forward in the direction of arrow 65 even when the cylinder core is bored out.

22 and 26 also show the groove 26 as a predetermined breaking point and the noticeably reduced recess 9 in the area of the key bit, which are the very essential features of the above invention.

 For the formation of the shoulder 63 with counter shoulder 64 on the one hand and the formation of the key channel 60 with the aid of the profile strips 6l on the other hand, independent protection is also requested.

In order to make it difficult to pull the profile strips 6l out of the cylinder core to the front, the bores for the profile strips in the cylinder core are preferably designed as blind bores in such a way that the profile strips are not visible from the front, so that the viewer has an undisturbed surface appearance. See pos. 66 in Fig. 22. This figure also shows how the hook 62 is anchored to the back of the cylinder core.

In particular, Fig. L5 shows that the outer ends of the pins 44 lie on a larger radius than the outer ends of the pins 46. The pins 44 therefore cooperate with the control curve 5l located on the larger radius and the pins 46 with that on the smaller radius control curve 50.

20, 2l show a pair of pins 67 for inserting the control plate 52 into corresponding recesses in the locking cylinder 7. For the same purpose, the control plate 52 has an annular shoulder 68.

Fig. 26 shows very clearly that there the upper lock cylinder 7 is not coupled to the lock case housing 3l because the coupling piece 54 is located entirely in the receptacle in the lock cylinder 7. In the lower part of FIG. 26, however, the other coupling piece 54 is located in the receptacles of both parts 7, 3l, so that these two parts are coupled to one another.

Claims (15)

1. Security lock with a one-piece housing (l), which consists of a cylindrical housing part (2) and an adjoining fastening part (3) with a threaded bore (4) for fastening the security lock to a door lock, with in a continuous, cylindrical opening of the cylindrical housing part used locking cylinders (7) with a locking bit (l5) which engages in its rotation in a recess of a striking plate (20) and thereby moves the striking plate (20) and a bolt connected to the striking plate (20), the cylindrical Housing part (2) has a recess (9) approximately in the center for the rotary movement of the locking bar (l5),
characterized by
that the recess (9) is provided essentially only in the cylindrical housing part (2), that the lock bit (l5) is formed by a pin which is guided and spring-loaded into a radial receptacle (l4) of a pin housing (l0, ll) and which, during its rotational movement, rests with its head (l8) against a control cam (23) which, against the force of the spring (l6), moves the pin (l5) radially inward into its inactive position, which the pin in its active position leaves outside the engagement with the control cam (23) for actuating the striking plate (20). 2. Security lock according to claim 1,
characterized by
that the housing (l) has a cross-sectional weakening (26) at at least one of its ends. 3. Security lock according to claim 1 or 2,
characterized by
that in the inner end face of at least one of the locking cylinders (7) a spring-loaded pin (28) is inserted, which is opposite a recess in the pin housing. 4. Security lock with a one-piece housing (l), which consists of a cylindrical housing part (2) and an adjoining fastening part (3) with a threaded bore (4) for fastening the security lock to a door lock, with in a continuous, cylindrical opening of the cylindrical housing part inserted locking cylinder (7) with a locking bit (l5), which engages in its rotation in a recess of a striking plate (20) and thereby moves the striking plate and a bolt connected to the striking plate, the cylindrical housing part (2) approximately in the middle has a recess for the rotary movement of the lock bit (l5),
characterized by
that the recess (9) is provided essentially only in the cylindrical housing part (2) and that the locking bit (l5) is guided so that it does not or when it rotates in the region of the recess (9) over the circumference of the locking cylinder (7) protrudes only slightly, in the area of engagement with the recess of the striking plate (20) but protrudes so far over the circumference of the locking cylinder (7) that the bolt from the striker (l5) can be operated. 5. Security lock according to claim 4,
characterized by
that the housing (l) has a cross-sectional weakening (26) at at least one of its ends. 6. Security lock with a one-piece housing (l), which consists of a cylindrical housing part (2) and an adjoining fastening part (3) with a threaded bore (4) for fastening the security lock to a door lock, with in a continuous, cylindrical opening of the cylindrical housing part inserted locking cylinder (7) with a locking bit (l5), which engages in its rotation in a recess of a striking plate (20) and thereby displaces the striking plate (20) and a bolt connected to the striking plate, the cylindrical housing part (2 ) has a recess in the middle for the rotary movement of the locking bar (l5),
characterized by
that the housing (l) has a cross-sectional weakening (26) at at least one of its ends. 7. Security lock according to claim 4 or 5,
characterized by
that the striker (l5) is guided and spring-loaded pivotally in a recess (32) of a striker housing (3l). 8. Security lock according to claim 7,
characterized by
that two part-beards (33,34) are provided, namely one for locking and one for opening the lock and that a control curve (50.5l) is provided which opposes one of the part-beards (33.34) holds the force of the spring (37) in the retracted, inactive position when it is not needed for closing. 9. Security lock according to claim 8,
characterized by
that an axial pin (44,46) is provided for each of the partial locking rams (33,34), which engages with one end in a recess (45,48) of the relevant partial locking ratchet (33,34) and locks it when its other end is on an increase in the control curve (50.5 l). l0. Security lock according to claim 8 or 9,
characterized by
that the adjoining partial mustaches (33,34) have cooperating elevations (4l) or depressions (42) which also lock the relevant partial locking bit (33,34) in an angular position in which the control cam (50.5l ) is no longer active. 11. Security lock according to one of claims 7 - 10,
characterized by
that the partial locking rams (33, 34) are pivotally mounted in a locking ram cylinder (3l), which has couplings (54) on both end faces with the inner one or can be coupled in a rotationally fixed manner to the outer lock cylinder (7.52), the control cams (50.5l) being provided on the end faces of the lock cylinders (7.52) facing the lock bit cylinder (3l). 12. Security lock according to claim ll,
characterized by
that the clutch consists of an axially guided coupling piece (54) which is inserted in the uncoupled position in a correspondingly profiled receptacle (57) in the relevant end face of the lock cylinder (3l) or the lock cylinder (7.52) and ends with this end face and in the coupled position simultaneously engages in correspondingly profiled receptacles of the two opposite end faces of the lock bit cylinder (3l) and of the lock cylinder (7.52). 13. Security lock according to one of claims l to l2,
characterized by
that the locking cylinder (7) has on its periphery a shoulder (63) with which it rests on a counter shoulder (64) of the housing (l) in such a way that pulling the locking cylinder (7) out of the housing (l) to the outside and is prevented at the front. 14. Security lock according to one of claims l to l3,
characterized by
that the key channel (60) is formed with the aid of several axially arranged profiled strips (6l) made of hardened steel, which are firmly connected to the cylinder core (7). 15. Security loop according to claim 14,
characterized by
that the profile strips (6l) protrude into a pipe channel (60) with a rectangular profile.

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