EP0831442B1 - Anti burglary device - Google Patents

Abstract

The burglar alarm device has a threshold value indicator (11) brought into alignment with an indicator stop (12) when the door or window is in the closed position. The threshold value indicator is subjected to an irreversible deformation upon forced opening of the door or window for providing an alarm signal when a given deformation is reached. The relative spacing of the threshold value indicator and the indicator stop prevents their contact under normal loading, with security locking bolts (9) for the door or window on either side of the threshold value indicator and the indicator stop.

Description

The present invention relates to a burglar alarm for windows / doors according to the preamble of claim 1.

Such burglar alarms are known. For that be for example DE-OS 44 32 221, DE-OS 44 04 548, called DE-OS 42 21 585 and DE-OS-39 36 084. With these burglar alarms there is mechanical separation of a first break resistance from a second break resistance. Between the two The wing has a clear opening resistance. For this the two opening resistors have a predetermined distance on. The alarm that triggers the alarm will then be activated within the clearance Element irreversibly deformed. Because of the irreversible Deformation the alarm signal is generated.

The break-in resistances are realized by closing points between sash and frame. The first break resistance to be relatively weak during the second burglary resistance the burglar considerable holding forces opposed to bind him in time. This basic idea makes sense when you consider that the threshold indicator, which is the element that triggers the alarm should have been before the second resistance is addressed. At this point it was done Already the alarm, so that the law enforcement officers are approaching can.

A fundamental problem with such burglar alarms is to avoid false alarms. It must therefore a so-called filter is present, which is clearly the conclusion allows the window / window in question Door to be broken open.

This filter offers the first break resistance, the is weaker in relation to the second opening resistance.

With this principle, the first break resistance must be overcome so that the alarm signal can be generated. A de facto destruction of the first break resistance is therefore necessary. In the event of attempts to break open that trigger an alarm the first break resistance must therefore always be renewed.

A fundamental problem of such burglary protection but also consists in that by overcoming the first break resistance the casement relative to the frame within of his free path between the first and second opening resistance becomes freely movable. Within the freeway the casement does not offer any resistance to the burglar. The burglar is thus enabled to two-stage opening resistance clearly recognizable. such Burglar alarms are therefore used by professional burglars easily recognized. But this is also connected with the knowledge that with reaching the second break resistance an alarm has already been triggered most likely is.

In principle, burglars extensively investigate their crime scene before the crime scouting and possibly also able to police radio eavesdropping is the risk for the burglar in such Burglar alarms can be calculated relatively precisely. The Risk is significantly reduced in that the burglar due to the two-stage break-up resistance is clearly informed of its own alarm triggering.

Another disadvantage of this concept is that by overcoming the first opening resistance the gap widths between the casement and frame are enlarged. As a result, larger and therefore stronger lever tools can also be used be introduced, creating the inherently positive effect of the second and increased opening resistance practically at least is partially compensated.

Another disadvantage is that with overcoming the first resistance to breakup also an additional motivation boost acts on the burglar because, due to the Success, it will also assume the following lock easy to overcome. This effect is due to the even larger gap width between sash frame and frame favored, because then obviously stronger lever tools can be applied.

DE 195 16 398 A1 is an intrusion detection system known with sensor, which in principle this disadvantage avoids.

The sensor is preloaded there and detects the deformation of the locking part, which is under the breaking load.

With a predetermined deformation path, the sensor should break and then generate the alarm signal.

However, this principle encounters considerable difficulties taking into account that the strikers not only under the preload due to the sealing pressure stand, but also the traffic loads acting on the window sash would have to intercept.

Since most of the usual windows / doors today fully automated continuous processes are manufactured, result from the resulting seat tolerances different pre-deformations for the locking parts, see above that the bias of the sensor is adjusted accordingly would. This is practically impossible.

In addition, this version does not take into account that one strives fundamentally, the closing points between sash and frame as stiff as possible to execute.

It therefore makes little sense in practice, the elastic deformation the locking point by a preloaded sensor monitor for breakage because the elastic deformation in the Principle avoided or kept as low as possible should.

In addition, practically no cases are known to occur at then the elastic deformation of the closing part could serve as an indicator of an attempted break-in if the locking point is still engaged. The invention proceeds from this however from.

It is therefore an object of the present invention under Avoiding the above disadvantages the well-known burglar alarm with practical exclusion of false alarm that with simplified construction work the risk of the undetected Alarm trigger increases.

This task is solved by a burglar alarm with the features of the main claim.

From the invention there is the advantage that under Inclusion of a defined free path between sash frames and frame without triggering the alarm for the burglar Overcoming the free path is practically not discernible that an alarm has been triggered.

The invention assumes that between sash and frame a slight relative displacement caused by violence is also possible if the Locking points are engaged and the attempt to break open first withstand while staying engaged and during the threshold indicator is not yet loaded.

This slight relative displacement between the sash and frame takes place while the closing points in Intervention is and will remain. The relative shift is made possible by the physical fact that between casement and frame practically a lot different elastic connecting elements connected in series are elastic and then in the manner of springs be plastically deformed with increasing force.

It is important that the possible elastic Deformations should not yet trigger the alarm as long as the deformations caused by the usual traffic loads such as Wind pressure and temperature expansion caused at the window become.

The locking points between the sash and Frame a practically continuous initially elastic deformable connection created that only when exceeded a certain force plastically deformed on the casement becomes.

As long as the deformations that occur are less than that deformations caused by the usual traffic loads alarm triggering is undesirable. Only after A deformation exceeding that resulting from the deformation of the predetermined traffic loads, the Alarm will be triggered.

So it is essential that the alarm is triggered only at a force is exerted on the casement, the larger one Deformation as the predeterminable traffic loads the sash causes a certain safety distance can be added. Only then should the Threshold indicator subjected to irreversible deformation become. When a predetermined deformation value is exceeded, e.g. Breakage of a glass rod or the like. then the Alarm.

The invention therefore represents the successful integration of known elastically biased locking points with a initially unloaded threshold indicator, but within the deformation path between the sash and Frame in which the locking points are still engaged are irreversibly deformed.

Decisive for this is the predetermined distance between the threshold indicator and the indicator stop and within which the sash can move freely is relative to the frame.

The threshold value indicator only becomes visible after the distance has been overcome loaded.

In this regard, it is particularly recommended to use a threshold indicator and position the indicator stop relative to each other so that they first when closing the casement walk past each other without contact. Since with that Closing the casement is always one - albeit minor - movement against the adjacent outer seals takes place, with the appropriate arrangement between the threshold indicator and the indicator stop of the intended one small distance also enlarged. This is in the sense of Invention because the usual traffic loads normally do not lead to complete relief of the outer seals allowed to. This way, in addition to the distance, the prevents the alarm from being triggered despite traffic loads, an appropriate safety distance is created automatically, alarm triggering is also impossible is.

This safety distance also carries the manufacturing-related assembly tolerances because the relative Position between those involved in the locking points Hardware components is taken into account.

The principle of this invention applies to windows / doors the closing points of the sash frame against lifting keep out of the frame. This is done through locking points, whose locking partner is effective against the direction of removal are in mutual engagement, so that lifting of the casement only under deformation / destruction of the Locking point or the profile spars of the casement possible is. The deformation of the locking point or the profile bars however, causes a deflection at the installation location of the threshold indicator, which is so large that it is relative to the indicator stop is moved so far that its to trigger the alarm required minimum deformation is exceeded.

Such locking points can e.g. through so deep in Locking bolts retracting locking bolts can be realized that the closing point was only overcome with plastic deformation can be. The entrance depth should be significantly larger than the production-related free relative path between the sash and frame.

Other such locking points are e.g. known as the designation PaX-Secura, see also EU 94 107 819. The specialty of these locking points also consists here that the closing engagement between the two Locking partners can only be overcome with a considerable amount of time can be because the locking partners or those attached to it Fasteners here also only through permanent deformation can be separated.

About these permanent deformations at the locking partners To be able to cause, of course, the elastic must first The deformability of the locking partners involved was overcome become. The load required for this is usually larger than the possible traffic loads, which automatically the necessary safety distance from the traffic loads for the alarm triggering element.

Especially for windows with locking points with approval for marking EF 0 - EF 3 according to DIN 18054 is a Security against break-ins guaranteed for a few minutes. While During this time, the burglar works on the window / door Demolition tool and tries to open a passage create. Such DIN-tested locking points are therefore particularly suitable for in connection with this invention to provide the required security against burglary.

In principle, therefore, closing points come for the invention considered, the closing partner of the relative movement between sash and frame to a predetermined Limit value, the limit being set by one from this Relative deflection increased lifting resistance is specified. In this respect, the present invention is clear from the two-stage Closure systems of the writings mentioned at the beginning differentiate. The alarm is triggered there during none of the two locking points is engaged. In the present The alarm is triggered against the resistance of the Locking point with a precisely defined free path between Casement and frame, which has no effect on the Threshold indicator is. It must also be taken into account that the alarm triggering threshold value is then already exceeded should be if the locking point is far from complete should be overcome. The greater the distance between the relative shift necessary to trigger the alarm between the sash and frame and the opening position of the casement, the longer the time to move back law enforcement officers are available. It is therefore desirable to the relative deformation leading to triggering the alarm of the threshold value indicator only to be set slightly, so that the alarm triggering with regard to the opening of the window / the The necessary time is done as early as possible.

The alarm should expediently already be triggered, after the maximum possible displacement of the casement is completed by the traffic load and above in addition, a slight path of the casement as a safety distance was bridged against premature alarm triggering. The minor route is said to be well before disproportionately increasing Breakout forces are necessary to be completed.

In order to avoid permanent damage to the window / door, the alarm trigger is already suggested to be provided if there is an intrusion on the burglar the sash can still reset elastically.

In this case it is ensured that there is no substitution of the sash in question is required, provided the law enforcement officers arrive in time.

Training is an essential aspect of the invention the locking points with locking partners behind each other, because these characteristics one with increasing deformation allow the sash frame to start with increasing locking force, that only long after the alarm has been triggered reached its maximum.

Further training is essential Invention in which the irreversible deformation of the Threshold indicator necessary force in relation to the Force on the sash at least until the moment of Alarm triggering is imperceptibly low. You will get away from it can assume that the alarm triggering with highly sensitive Additional devices (e.g. stethoscope) not detectable is so that there is permanent uncertainty for the burglar, whether his attempted break-in led to an alarm or not.

One sees, for example, as a threshold indicator Glass tube in front with integrated electrical conductor, which would drive against a fixed indicator stop this requirement has already been met. In any case, the Threshold indicator can be irreversibly deformed to be unique to be able to provide evidence of an attempt to break open. For this the use of brittle fracture sensitive material proposed. This can e.g. Glass, ceramics, porcelain or something like that. Glass or ceramic also offers that Advantage that it is practically difficult to locate and from this Basically represents an additional risk for the burglar.

In addition, the threshold indicator is proposed Easily accessible and replaceable when the casement is open to provide after a failed break-in attempt to have the necessary security again. The threshold indicator can, for example, in a version on the casement or fixed to the frame. You can see the attachment on the frame in front, this offers the additional Advantage that the lead out of the alarm signal lines none Problems and especially not from the outside it can be seen where the alarming element is located. You go once from the usual hardware technology on such windows / doors off, the threshold indicator is still suggested attached to the frame and the corresponding Indicator stop with the connecting rod of the fitting couple. In the closed position of the espagnolette fitting the indicator stop then sits in front of the head of the threshold indicator and is given a predetermined deformation path of the casement relative to the frame e.g. to break the threshold indicator to lead.

As a result of attaching the indicator stop to the Driving rod is ensured that only in the closed position of the connecting rod fitting the threshold value indicator can take effect.

Further training is particularly important the threshold value indicator is designed as a separate plug-in part which is inserted into a striker on the frame can be.

In this way, the threshold indicator becomes the one hand attached to the frame, which reduces cabling means. On the other hand is the threshold indicator also easily exchangeable if a break-in attempt is made was revealed. It is also the distance between the indicator stops for locking pin on the drive rod known what reduced construction costs in the manufacture of fittings means.

Fig.1

ein Kraft-Weg-Diagramm,

Fig.2

ein prinzipielles Ausführungsbeispiel der Erfindung,

Fig.3

eine Detailansicht von Schließstelle und Einbruchsicherung,

Fig.4

eine weitere Detailansicht von oben,

Fig.4a

Seitenansicht gemäß der Linie IV-IV aus Fig.4, und

Fig.5

ein weiteres Ausführungsbeispiel der Erfindung.

The invention is explained in more detail below on the basis of exemplary embodiments. Show it:

Fig.1

a force-displacement diagram,

Fig.2

a basic embodiment of the invention,

Figure 3

a detailed view of the locking point and burglar alarm,

Figure 4

another detailed view from above,

4a

Side view along the line IV-IV of Figure 4, and

Figure 5

another embodiment of the invention.

Unless otherwise stated below, the following description always for all figures.

Fig. 1 shows the basic in a force-displacement diagram Concept of burglar alarm according to the invention. On the Horizontal is the relative displacement Δ s between the casement and frame applied. The ordinate shows qualitatively the amount associated with each relative shift Force.

For reasons of clarity, the ordinate is also mirror axis for the area to the left of the zero point the relative displacement between the sash and Frame. This area can be seen in mirror image, he states that when closing the casement the question upcoming closing points before their closed position stand. This area is labeled I. After each Locking point has come into locking engagement, the Chart area II.

When the casement is closed, it comes first to the sealing system position 18. In this position the sash touches the sealing lip on the outside of the window just. The associated locking point is just before their end position. By turning the locking handle on the casement the pressure path 16 is covered, the casement towards the outside of the window against the corresponding one Seal pressed and the window closed tightly in this way. The locking force F increases at the locking points considerably on a relatively short contact path 16. With Overcoming the pressure path 16, the casement is now closed, all locking points are engaged.

The window / door would be in this position, when an attempt is made to break out.

First of all, however, is supposed to be from the proper Closed position. The relative shift between sash and frame is in this position set to ZERO.

In this closed position act on the casement the usual traffic loads, e.g. Wind pressure, temperature expansion. The area of the traffic load is designated 17. It is taken into account that predetermined forces on the Sash frames act that have a certain relative displacement between sash and frame. In in any case the associated relative shift is practical linear elastic so that the casement is under each reset the occurring traffic load elastically can.

To ensure that the usual traffic loads does not trigger an alarm is a predetermined one Wing movement 19 under the traffic load 17 to be taken into account and from the maximum deflection under the traffic load 17 to additively take into account a safety distance 20, the one allows additional relative displacement without this alarm triggering would be serious.

Only when this safety distance 20 is exceeded sets an initially elastic deformation 21 of the threshold value indicator 11, which results in an irreversible deformation 22 transforms.

The irreversible deformation can e.g. through plastic Material flow. The irreversible deformation can also exist in the fraction 23 of the threshold indicator 11. The irreversible deformation of the Threshold indicator 11 necessary load on the threshold indicator regardless of the loads at the locking point, because the closing point and threshold indicator are separate components are. The burden of irreversible deformation of the Threshold indicator is orders of magnitude smaller than the load to generate the seal contact pressure.

In the present case, it is shown that the threshold indicator first an elastic deformation 21 begins the end of which then results in material fatigue, creep effects, hardening effects stand. With further force on the Threshold indicator this will come to break 23.

When the threshold indicator breaks, the alarm signal 24 issued. The alarm signal can, as is known per se, be communicated to the security forces by telephone. additionally can blink LEDs on the casement to deter be provided.

It can therefore be assumed that the alarm signal 24th has already been produced, although the casement is still long has not been moved out of its locked position.

For this purpose Fig.1 shows that on the casement another must act much higher force before the casement separated from the frame by failure of the locking point becomes. Only at the end point of the curve is the locking force of the Closing points in engagement are overcome. This point is designated 25. It is therefore already at extreme little relative displacement between the sash and frame, which easily in the linear elastic range of involved materials may be due to the threshold indicator an irreversible deformation occurs which is a sure sign for a serious attempt to break in. This deformation took place long before the closing point at point 25 was overcome.

The irreversibly deformed threshold indicator shows the point in the house where the break-in occurred. The break-in point can thus be clearly identified become.

It is essential to this invention that the path to irreversible deformation 22 of the threshold indicator 11 exclusively against a locking force of those in engagement Closing points is covered, which is a deformation corresponds to which is caused by the traffic loads Deformation exceeds and that the alarm trigger 24th takes place after the path against the locking force of the locking point intervention in some cases, however, not up to theirs complete overcoming.

In addition to the elasticity of the frame profiles used also the elasticity of the hardware components involved the crucial role for those to break the threshold indicator leading relative displacement between casement and frame.

This is the leading deflection of the Threshold indicator after overcoming the (very low) Clearance between sash frame and frame completely within the force-displacement diagram of the locking point forces with which she resists the attempt to break open.

The start of the deflection present on the threshold value indicator lies just outside the relative shift, which the casement may be due to the maximum occurring Traffic loads experienced, plus an additive safety constant. The end of the deflection of the threshold indicator is far from the end of the force-displacement diagram of the window / door at the moment of opening.

The following description of the figures deals essentially with the device features of the present Invention. The figures show a burglar alarm for windows / doors 1. Such windows / doors consist of one Sash frame 2 which is guided in a frame 3. For this purpose, the sash 2 has a stop side 4 Pivot hinge on. Opposite the stop page 4 is on the Handle side 5 a handle 10 attached. The handle 10 cooperates a circumferential fitting 6 together. On the surrounding fitting 6 sit individual locking bolts 7 that move of the fitting 6 with closing pockets 8 on the frame side interact. By retracting the locking bolt 7 in the closing pockets 8 each have a closing point 9 defined, which is characterized by a firm connection. This can e.g. through deep into corresponding insertion holes engaging locking bolts can be realized. In Another variant are the locking bolts for this purpose 7 expanded like a mushroom head, while the closing pockets attacked by the mushroom-shaped extensions become. The closing pockets 8 form entry slots, the Slit width adapted to the necks of the locking bolts 7 is. The locking bolts reach behind with the mushroom heads 7 the associated lock pocket 8.

In this way is between sash 2 and frame 3 created a strong connection that also under Force majeure first use this attempted break-in withstand.

2 shows that with a lever tool 26 an attempt is made from the outside of the window into the gap between Door frame 2 and frame 3 penetrate to the casement 2 release from its locking point intervention.

A predetermined relative shift takes place between Casement and frame. The dashed line on lower profile spar shows a possible deformation qualitatively on. During this deformation, the threshold indicator 11, which is here firmly on the sash 2 against Indicator stop 12 fastened on the frame side. There the indicator stop 12 is stationary, becomes the threshold indicator 11 first elastic then irreversible deformed. From a predetermined deformation value, the Intrusion alarm signal 24 is generated.

To generate the alarm signal, a predetermined irreversible Deformation on the threshold indicator is present. The irreversible deformation can be plastic. Likewise is the threshold indicator may break. In both cases can, for example, via an electrical circuit with negating Element the alarm signal can be initiated. In this regard, the state of the art is used.

To the burglar as possible when trying to break out bind for a long time, and for as long a time as possible to get the law enforcement officers up, it is suggested that the alarm is triggered after the Way against the locking force of the locking points practically only was initially covered. Depending on the material parameters such as strength, rigidity, profile cross-section, as well as the structural conditions such as dimensions, material, free bending length of the wing frame spars, tolerances, sealing pressure, can determine the optimal relative position between Threshold indicator and indicator stop also experimental be determined. This is done e.g. by specifying certain Traffic load and measurement of the associated deflection. In this Deflection is intended to be a predetermined safety distance 20 be added. Only then is the activation of the Threshold value indicator 11 Given the minimum time in which the sash frame attempts to break open must resist (e.g. 12 min.).

You can see a relatively small distance between Threshold indicator and indicator stop, for example already overcome after 2 min alarm triggering would go unnoticed after 2 minutes the burglar. The law enforcement officers would have 10 Min. Time to move up and a real chance the burglar caught red-handed before being able to enter Opening was created.

In addition, the alarm triggering within a Way against the locking force in which the Sash rests still elastic. This gives the added benefit of being a relatively good chance there is the burglar before the sash is destroyed to be able to capture.

This fact results from the relatively long approach time, which the law enforcement officers in the event of early alarm triggering is available.

Locking points are also to be used which under a steadily increasing locking force the attempt to break open resist. This includes locking points whose Locking partners are plastically deformed until failure must and can then separate from each other. This can can be realized by deeply retracting cross bolts or through interlocking locking partners. This condition requires that at least one of the locking partners to the extent that it must be plastically deformed until it disengages with the other locking partner. The plastic deformation can only have a steadily increasing up to a maximum increasing locking force can be achieved, the Maximum at the moment of irreversible deformation of the threshold indicator has not yet been reached (e.g. is only 3%).

Advantageously and without limitation to this specific one Mushroom bolts and undercut entry pockets are available used as a locking partner, on the one hand on the casement and anchored to the frame. there drive the mushroom bolts with their necks into the entry pockets while the mushroom heads reach behind the entrance pockets.

To get more time to move the law enforcement officers, are the mushroom bolts made of high-strength steel with proportions of chrome and nickel, while the undercut Seat pockets sit on case-hardened strikers.

As also shown in particular in FIG. 2, there are several Locking points 9 are provided on the individual window bars, where threshold indicator 11 and indicator stop 12 between two locking points on a profile bar are arranged.

The symmetrical arrangement of the threshold indicator and Indicator stop between two locking points is, however not mandatory.

Since usually the lower cross member 27 of the window / Door is particularly vulnerable to break-in, it is additionally proposed the threshold indicator on the lower cross member 27 of the Window / door. In addition, however, can be any many threshold value indicators in all possible places of the window / door.

As you can easily imagine, it is necessary Force to achieve a deformation on the casement, the qualitatively according to the dashed line on the lower cross member Fig. 2 corresponds considerably, i.e. it is in the range of about 1000 Newtons.

If you provide a threshold indicator that is sensitive to brittle fracture Material exists, e.g. Glass or ceramic, so the breaking strength necessary for such materials is likely are in the 1/100 Newton range.

This results in a force ratio between the Deformation of the threshold indicator necessary force and the force acting on the sash for this purpose 1: 10,000 or less. With these characteristics should also be for the most experienced burglar will trigger the alarm by breaking of the threshold indicator is invisible stay.

Fig. 3 also shows that the threshold indicator at open sash easily accessible and replaceable is.

For this purpose it is proposed that the threshold indicator 11 set in a frame-side version 28 is. The socket 28 can be made from a commercially available building material such as bulb holder, fuse holder or the like. consist. In the present case, the frame-side version 28 consists of a receiving body 29 which struck the frame 3 is. On the outside, the receptacle 29 has a thread which is screwed a union nut 30. Downtown the union nut 30 holds the threshold indicator used there 11 firmly in the picture 29. The threshold indicator has a protruding pin 31 which with a Indicator stop 12 fixed on the casement side interacts. In the closed position shown - the locking bolt 7 is in engagement with the closing pocket 8 - the indicator stop 12 sits in front of the head of the threshold indicator 11 and this is when opening the casement 2nd break. At this moment, is drawn over the electrical lines triggered the alarm.

By attaching the indicator stop 12 to the Drive rod 32 of fitting 6 is additionally ensured that only in the shown closed position of the locking point 9 the possibility of deforming the threshold indicator 11 exists because it then faces the indicator stop.

In addition, Figure 4 shows that the threshold indicator 11 also as a separate insert part 33 for a on the frame fixed locking part 34 is. The closing part 34 for this purpose has the locking pockets 8, in which the locking bolt 7 retracts. Coupled with the drive rod of the Fitting is the indicator stop 12. Dashed in the the indicator stop sits with the drawn right position clear distance in front of the threshold indicator 11. In this The indicator stop 12 comes into position when the locking bolt 7 on the end slope of the pocket 8 accumulates. The bevel serves the sash to press firmly against the outside sealing lip 13. To for this purpose, the handle of the circumferential fitting 6 some force rotated after the sash 2 in the Sealing system position 18 has been brought. It drives the retracted locking bolt 7 on the approaching Slant of his closing pocket 8, which leads to the sealing lip 35 climbs up and pushes the casement against the Sealing lip fixed to the frame 13. The indicator stop 12 be coupled with the drive rod 32 of the fitting, so that the indicator stop 12 a proper distance from him facing end face of the threshold indicator 11. This ensures that as a result of the usual traffic loads a touch between threshold indicator 11 and Indicator stop 12 is eliminated. Nevertheless, the threshold indicator 11 when traffic loads are exceeded in Was able to recognize this as an attempted break-in and the alarm signal trigger. The threshold indicator 11 can with its Pin inserted into a simple pocket of the closing part 34 become. In this way it is easy to replace, and after a break-in attempt, the window / the Newly secured door against burglary attempts become.

Fig. 4a also shows the view of the indicator stop 12, like this overlapping in front of it Face of the threshold indicator 11 is seated. Is moving the indicator stop 12 corresponding to the threshold indicator 11 too, it can be deformed so plastically that the alarm trigger 24 takes place.

A further development of the invention is shown in FIG. 5. Here sits in the joint between frame 3 and casement 2 of a window / door in a common aligned Bore the threshold indicator 11 and extends transverse to the possible opening direction of the casement 2. The threshold indicator 11 connects both the casement 2 and the frame 3 with each other. From one predetermined deformation path 35 becomes the threshold indicator 11 break and the alarm is triggered. Opposite a further distance 36 is provided for bridging any Manufacturing tolerance.

In a further exemplary embodiment, the threshold value indicator so coupled with the door fitting that he automatically when the door is locked in a corresponding indicator holder is inserted. The bridged Threshold indicator the joint between the sash 2 and the frame 3 as long as the door fitting the corresponding Has locked position.

This training can also be used for window fittings use.

In an alternative embodiment, the threshold indicator 11 coupled with a transmission, which with Arming the system is activated. At the moment of The threshold indicator will then be armed in its proper position spent and only with permitted switching off the monitoring system is removed from this position.

Claims (16)

1. Security device for windows/doors having a threshold value indicator (11) which sits on the blind frame or on the leaf frame and which, when the leaf frame (2) is closed and then subjected to the sealing contact pressure, moves relatively against an indicator stop (12) which sits on the leaf frame or on the blind frame and in so doing by means of the predetermined relative displacement between the leaf frame (2) and the blind frame (3) is irreversibly deformed and which indicator, when the deformation value is greater than a predetermined value, generates an alarm signal (24), wherein there are provided between the leaf frame (2) and blind frame (3) closure sites (9) which are prestressed in an elastic manner against the contact pressure of the seals between the leaf frame and the blind frame when the leaf frame is closed and whose closing partners (7, 8) engage the closure sites until a forced-entry force predetermined by the plastic destruction of the closure site is exceeded, characterised in that:

   1.0. the threshold value indicator (11) and the indicator stop (12) are positioned relative to each other at a predetermined spacing when the leaf frame is closed, and that

   1.1. the spacing is dimensioned such that there is no contact between the threshold value indicator (11) and indicator stop (12) under loads experienced on the leaf frame under normal usage, and that

   1.2. from the closed position of the leaf frame, when the leaf frame is loaded against the elastic deformation capability of the participating closing partners, the spacing initially reduces until there is contact between the threshold indicator and the indicator stop, and

   1.3. only where a load experienced under normal usage is exceeded with a further increasing loading of the leaf frame in the case of the closure sites still being closed is the threshold value indicator increasingly loaded until irreversible deformation occurs.
2. Security device for windows/doors having a threshold value indicator as claimed in Claim 1, characterised in that the spacing between the threshold value indicator (11) and the indicator stop (12) is dimensioned such that the irreversible deformation of the threshold value indicator (11) occurs when the closure sites (9) are still loaded in the region of the elastic deformation.
3. Security device for windows/doors having a threshold value indicator as claimed in Claim 1, characterised in that the alarm is triggered (24) after less than half, preferably less than a third, preferably less than 10% of the distance against the locking pressure has been travelled.
4. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 3, characterised in that the alarm is triggered (24) within a distance travelled against the locking pressure in which the leaf frame (2) is still moved back in an elastic manner.
5. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 4, characterised in that the closure sites (9) comprise such mutually rear engaging closing partners (7, 8), that the distance is travelled to the irreversible deformation (22) against a locking pressure which increases up to a maximum value, which has not yet been reached at the time of the irreversible deformation.
6. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 5, characterised in that the closing partners encompass mushroom-headed bolts (7) and undercut receiving pockets (8) which are anchored on one hand on the leaf frame (2) and on the other hand on the blind frame (3).
7. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 6, characterised in that the mushroom-headed bolts (7) consist of high-tensile steel comprising portions of chromium and nickel, and that the undercut receiving pockets sit on case-hardened closing pieces (34).
8. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 7, characterised in that several closure sites (9) are provided on the individual window spars, and that the threshold value indicator (11) and indicator stop (12) are disposed between two closure sites (9) which sit on a profile spar.
9. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 8, characterised in that the threshold value indicator (11) and indicator stop (12) sit on the lower transverse spar (27) of the window/door.
10. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 9, characterised in that the force necessary to cause the irreversible deformation (22) of the threshold value indicator (11) is imperceptibly small in ratio to the force on the leaf frame when the alarm is triggered (24) (for example 1:10 000 or smaller).
11. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 10, characterised in that the threshold value indicator consists of a material which is susceptible to brittle fracture.
12. Security device for windows/doors having a threshold value indicator as claimed in Claim 11, characterised in that the threshold value indicator (11) consists of glass or ceramics.
13. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 12, characterised in that the threshold value indicator (11) is easily accessible and replaceable when the leaf frame (2) is open.
14. Security device for windows/doors having a threshold value indicator as claimed in Claim 13, characterised in that the threshold value indicator (11) is fixed in a frame-side mounting (28).
15. Security device for windows/doors having a threshold value indicator as claimed in any one of Claims 1 to 14, characterised in that the indicator stop (12) is a push bolt on the drive rod fitting (32), and that the threshold value indicator (11) sits on the blind frame (3).
16. Security device for windows/doors having a threshold value indicator as claimed in Claim 15, characterised in that the threshold value indicator (11) is a separate insert part for a closing part (34) fixed on the blind frame (3).

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