WO1998005839A1

WO1998005839A1 - Security lock

Info

Publication number: WO1998005839A1
Application number: PCT/EP1997/004257
Authority: WO
Inventors: Klaus Bloch; Werner Nolte
Original assignee: Metaform Metallverarbeitungsgesellschaft Mbh
Priority date: 1996-08-05
Filing date: 1997-08-05
Publication date: 1998-02-12
Also published as: DE19733856A1; AU4378697A

Abstract

The invention relates to a security lock with a rotatable cylinder (Z) in a housing (S) and one or several followers with locking pins (L, M, N) which are designed to engage in the channels of the cylinder (Z), thereby blocking the rotation of the cylinder (Z), wherein at least one of the followers (1, 2, 3) comprises an alectronically controlled sensor, which reacts to unauthorized interventions, especially movements of the lock or heating.

Description

Security lock

The invention relates to a security lock with a rotary cylinder and possibly spring-loaded tumblers (security pins).

In known security locks, the appropriate key moves the tumblers against the spring loads on the individual notch surfaces of the key. If all tumblers are brought with their outer ends to a level with the outer surface of the cylinder, then the cylinder can be rotated.

Unauthorized persons make use of this construction by trying to break open the lock with known intrusion tools such as tools, pens, pliers, heating the entire lock, hitting with the grove and, above all, thin plates or the like. For example, thin plates are inserted and in this way lift all the pins one after the other until the lock cylinder can be rotated through an object inserted into the key channel. Security systems are generally located within the rooms. The unauthorized person can therefore first enter the room through his adapted tools and, if necessary, disable these security systems.

This is where the invention begins.

The invention has for its object to provide security locksmiths who combine the security function with the alarm function.

This is achieved, according to the invention, surprisingly simply in the case of a security lock with a rotating cylinder and, if appropriate, spring-loaded tumblers, in that at least one of the Tumblers or safety pins, preferably all, contain an electrically controlled sensor which reacts to impermissible interventions, in particular movement of the lock or heating.

An electronic circuit, in particular a microprocessor, can preferably lie in a circle with the tumblers, which, when actuated and contacted, for example by a pen, triggers a time program, at the end of which there is an alarm.

It can be expedient to be able to bring about a short circuit via the tumblers when the lock is heated.

The insulation between the tumbler and the body can consist of plastic, which melts when exposed to heat, so that the springs, which press against the tumblers, lead to the power line and thus trigger an alarm.

The alarm system can be assigned a device known per se, in particular a nozzle, for dispensing paint, odorant and the like.

The lock cylinder according to the invention is thus designed in such a way that it is impossible to safely break open the lock with the known intrusion tools.

If there is a foreign object, especially the wrong key, reworked key wire etc. in the cylinder for longer than 3 seconds, for example, the alarm is triggered. Even thin plates, whether made of metal or plastic, as they have been used to open the opening to lift the individual pens, also trigger an alarm. The time until the alarm is triggered is adjustable.

The integrated pressure sensor and cable routing monitor and prevent violent interference. Even a power failure that lasts for days is replaced by a battery.

The shape of the key for a lock according to the invention can be modified in comparison to conventional keys. This prevents the owner from inserting the wrong key into the cylinder and triggering an unwanted alarm.

The security lock can be expanded and improved later and on all doors, windows, car locks, roof windows, i.e. wherever unpleasant visitors require admission.

This security system also has the advantage that the alarm is triggered before a person has entered the room. Previous warning systems were mainly or exclusively integrated within the rooms. Even if someone in the room tampered with the system to enter later, they will be left behind because even if the wires or power supply is cut off, this will also trigger an alarm. Only those who installed the system can disarm it again.

In addition, an inexpensive, quick and easy installation can be expected. The safety system must be installed by every technically gifted person. Thanks to the new electronic parts, the system can be manufactured very inexpensively.

The perpetrator can also be found quickly. It is possible to let paint, odorant or the like escape from a small nozzle of the alarm system and thus identify the person who is tampering with the lock as soon as the alarm is triggered.

Such dyes are known that only with certain, the Burglars presumably are unknown antidotes to remove. The same applies to odorants.

What is happening!

The burglar manipulates the lock and manages to lift a first security pin. The time program is started by the output signal of the assigned sensor. Depending on the type of sensor, this can be done e.g. B. by opening a contact or by short circuit.

A sensor can be provided which reacts to pressure or the displacement which is exerted on a sliding pin when a key or foreign object is introduced into the key channel by generating a short circuit as soon as a limit value is exceeded.

After 3 seconds, for example (the time can be set), the program checks whether the short circuit persists. After this time, if the key fits, all the pins should be raised to the correct height, thus eliminating the short circuit. If the key was operated correctly, this would be the normal case. However, the intruder does not manage to within the set time of e.g. Seconds to bring all the pens to one level and the lock,. open, the alarm can no longer be stopped, possibly accompanied by paint spraying, telephone ringing, destruction of the key channel or the like.

It is also difficult to manipulate this security lock because 3a requires different tumblers and so all connected pins come into contact with the metal and have to be brought to a high (level) within the set time. To ensure reliable functioning, each pin can be surrounded by a non-conductive sleeve, in particular made of ceramic.

The prerequisite is that all pens reach a height and the short circuit is eliminated or interrupted again within the specified time.

The circle is in the normal case: if the alarm is triggered, a short circuit is caused without interruption. The reference voltage set by electronic component B must not deviate up or down within the set time.

A series connection of a weaker and a stronger spring with an interposed non-conductive intermediate piece can preferably be provided, as a result of which if the elements are acted upon by the key beyond normal compression, a short circuit and thus an alarm is triggered. In general, a non-conductive sleeve will surround the safety pins or tumblers.

The spring close to the tumbler can be enclosed by a conductive sleeve guided inside the sleeve.

In the case of a combination lock, it is also possible to electronically control some number rings, in particular all number rings, using sensors, whereby an alarm is triggered if the number setting or number is entered incorrectly several times.

An exemplary embodiment of the invention will now be explained in more detail with reference to the accompanying drawings, which show in Figure 1 a section through a cylinder lock in the plane of the key channel; Figure 2 shows a drilled lock; Figure 3 shows a detail of Figure 1; FIG. 4 shows a variant of the tumbler 2 from FIG. 1; Figure 5 shows the electronic equivalent circuit of such

Castle; and FIG. 6 AD elements of a preferred embodiment of the security lock according to the invention. In Fig. 1 a cylinder lock is shown in the position without a key.

The installation of a cylinder lock is not dealt with in detail since this can be conventional in itself. With security locks, pins or locking bolts prevent the cylinder from rotating when the key is removed. When the key is inserted, it pushes the locking bolts outwards and the cylinder can be turned.

Only the most essential parts of the construction according to the invention are described. In the holder of the security lock there is one on both sides of a device to be locked, such as an automobile, a window, a door, a gate of safes, motorbikes, bicycles, lockers, construction site vehicles, lockers or the like. The system can be integrated on one side, but generally on both sides of the element to be locked without great effort, for example that a burglar, e.g. entered through a window, not without triggering an alarm, e.g. the door can be opened from the inside to remove stolen goods or yourself from the crime scene.

Fig. 1 shows a lock for two-sided erfmdungsgemaßes A ^¬ construction.

The Schloßkorper comprises a housing S and a recessed cylinder Z. Tumblers 1, 2, 3 are, electrically insulated from the housing by a socket G, housed in channels of the housing.

They each comprise a threaded screw W arranged at the outlet of the channel with a pin K, a compression spring E carried by the threaded ^{screw ¬} and a locking bolt L, M, N, which protrudes from the channel of the housing in the blocked state of the lock and is in alignment Channel of the locking cylinder Z engages. In the channels of the cylinder Z there are sliding pins F, J slidably arranged, which transmit the pressure of a key inserted into the cylinder on the tumblers.

1 shows three different configurations of tumblers of the lock according to the invention. The tumbler 1 forms a sensor that is sensitive to boring the lock or hammering in the lock cylinder as well as attempts to manipulate the lock by a plastic sheet inserted between the cylinder and the housing. The locking bolt L of the tumbler 1 consists of a conductive element B, which is insulated from the walls of the channels in the housing S or the cylinder Z by a plastic sleeve H and is in contact with a potential an anaeleσten by the compression spring E m. A conductive cap Q makes electrical contact between the element B and the sliding pin F. Element B contains a semiconductor, preferably a Zener diode, which maintains a predetermined potential difference between the threaded screw W on the one hand and the body S, Z of the lock on the other.

Fig. 2 shows the castle in an attempt to break open.

The normal position of the cylinder Z in the longitudinal direction is indicated by the dashed line 4. If, as is very often the case, an unpleasant visitor tries to force cylinder Z out (for example by hammering) to any side 3, locking bolt L is sheared off, as shown in FIG. 2 at 5, or damaged. The voltage changes. The alarm is triggered. The housing S also comes into contact with the current-carrying element B. The short circuit in turn triggers an alarm.

If someone tries to drill out the springs E instead, the drill 7 comes into contact with the current-conducting springs E and short-circuits them with the housing S. The alarm is triggered. Even if someone tried to use a non- tendency drill, such as ceramic drill or the like to work, then the drilling chips will make the contact between the spring E and the housing S of the lock.

If someone tries to insert a plastic sheet between cylinder Z and housing S, the current flow from element B to cylinder Z is interrupted, the potential difference between threaded screw W and cylinder Z increases and triggers an alarm again.

The locking bolt M of the tumbler 2 from Big 1 comprises a sensor which is sensitive to manipulation with a metal sheet inserted between the housing S and the cylinder Z. It includes a conductive pin. , which is held in an insulating sleeve X and protrudes slightly towards the cylinder Z over the sleeve. The pin Y presses against a slide pin J made of non-conductive material. A circumferential groove P around the cylinder 7 is dimensioned such that the sleeve X abuts the edges of the groove when the cylinder is rotated and thus keeps the pin X separate from the cylinder. This state is shown in Fig. 3. In normal operation, therefore, no current flows through pin Y. However, if someone tries to enclose metal sheets between housing S and cylinder Z, it inevitably touches pin Y and leads to a short circuit and thus to an alarm

Sleeve X and sliding pin J can be made of plastic, ceramic, glass, stone or any other suitable insulating material.

Fig. 4 shows a variant of the tumbler 2, in which the sliding pin J is also provided on the end face with a groove, the dimensions of which correspond to the groove P of the cylinder. This variant has the advantage that the same conductive material can be used for the sliding pin J as for the sliding pins F.

Another advantage of this variant results from the use of meltable material for the insulating sleeve X. Will that Lock heated so that the sleeve X melts, so the spring E presses the pin Y against the slide pin J, so that a short circuit arises, which triggers an alarm.

The locking pin N of the tumbler 3 (Fig. 1) comprises a compression spring C, which is weaker than the spring E, em non-conductive intermediate piece A, which is arranged between the springs E and C, and a conductive sleeve D, which is in the insulating sleeve G is guided and encloses the spring C.

If you press the locking bolt N beyond the intended setting of the elements (downwards in the illustration), the spring C is pressed together. The non-conductive intermediate piece A is bridged by the oversized thrust and is thus rendered inoperative: the circuit from the spring E to the cylinder Z is closed via the conductive sleeve D. If the short circuit caused by bridging the intermediate piece continues for too long, the alarm is triggered.

A power cable leads to pin K and thus to the springs from the outside. The cables are routed through the threaded parts W.

The insulating bushes G can be glued, screwed or fastened in any way.

In a further development of the invention, the following can be provided: if a stranger comes into possession of a supplementary or original key and tries to use it to open the lock, he triggers an alarm because the response time has been set by the owner to zero seconds, for example is.

The owner can use the alarm system for this purpose, he has to lock the door when it is open, from the outside, using a remote control, for example with VHF frequency, to put it out of operation at any time, thus securing and closing the lock. It is favorable if the contact points are either coated with a corrosion-free surface, such as gold or chrome, or are made of gold or chrome. The measures serve to protect the contact points against weather and corrosion.

Furthermore, according to an additional feature of the invention, the outgoing cables from the tumblers can be guided in the lock body to the protective room side over the weak point of the middle part of the lock and connected or fastened there to the continuing cable connection. This cable routing prevents a cylinder that protrudes too far beyond the door due to improper installation from being twisted or destroyed by force without triggering the alarm. In this case, the cable is either cut or short-circuited, both of which trigger the alarm.

All tumblers can be coupled with a timer which, depending on the tent setting, triggers an alarm from the start of a reference voltage change or a short circuit after this time has elapsed, if the reference voltage change or short circuit is not interrupted within this time and a reset to the normal state takes place.

A particular advantage is the modular system according to the dung OF INVENTION ^¬: the various tumblers can in the housing in any order (1-2-3; 3-1-2, ...) can be arranged, moreover, they can be used individually or severally, even be combined with conventional tumblers forth ^¬ used.

Referring to Figure 5, the electronic component B (for example Zenerdio- de, resistance) forms in one of the closing elements of the lock with the electronic component at point R U.REF ^¬ a reference voltage that is evaluated in the downstream electronics.

This reference voltage U.REF can be within the voltage U-> (for example 15 volts) U- or ground (point Z). This voltage can move in the normal operating state (no alarm) in a window to be set accordingly (eg 6.5, 7.8 volts). If the voltage rises above the set voltage window (eg 7.8 volts) or falls below the set voltage window (eg 6.5 volts), an alarm is triggered.

Circumstances triggering the alarm:

1. Cable break: lock electronics; Voltage rises at U.REF e.g. 7.8 volts.

2. Short circuit in the cable: lock electronics; Voltage drops at U.REF e.g. 6.5 volts from.

3. Damage to the electronic component B (eg through- ^bores ): a) Interruption: voltage rises above, for example, 7.8 volts. b) Short circuit: Voltage drops below 6.5 volts at U.REF.

4. Short circuit in the specially designed locking mechanisms between points E and Z or D; Voltage drops at U.REF e.g. 6.5 volts from.

6 shows in its parts A to D elements of a preferred embodiment of the lock according to the invention.

6A is a side view of the housing 10 of the lock. In the left part of the housing, where the locks channels of the housing were accommodated in the locksmiths according to FIGS. 1 to 4, a cutout 12 is formed. 6D shows the housing in section through the cutout 12 along DD. This milling is provided to accommodate a uniform holder 14 for all tumblers that Fiα. 6B in longitudinal section and in FIG. 6C in cross section. Any known latching means, tongue and groove or dovetail arrangements or any other fastening means (not shown) can be provided for anchoring the holder 14 m of the milling. This holder 14 made of non-conductive material comprises a plurality of channels 16 which are provided to to take one guard locking each. The tumblers themselves correspond to those from FIGS. 1 to 4 and are therefore not shown again. Each channel 16 has an internal thread, at least in its upper region, in which the screw W of the corresponding tumbler is adjustably guided. As the cross section in FIG. 6C shows, the channels are connected to one another by an elongated slot 18. This is provided to receive a contact plate (not shown) which contacts all screws W of the tumblers. The contact plate can, for example, be arranged horizontally above the bottom of the groove 18, so that it is clamped between the screws W and the springs E of the tumblers. As long as it does not touch the bottom of the groove 18 and is sufficiently flexible, this does not affect the adjustability of the screws W.

Em channel 20 connects the milling 1 -. in the left part of the housing 10 with a U-shaped Aussparunα 22 m right part of the housing. A wire 22 connected to the contact plate extends through the channel 20 and is connected to a wire of a two-wire connector 24, which is accommodated in the U-shaped recess 22. The second wire of this connector 24 is connected to the housing 10. To connect the security lock according to the invention to an alarm system, it is sufficient to connect a two-core cable leading to the alarm system to the plug connector 24 by means of a complementary plug and to lead this cable out, expediently through the right arm 26 of the U-shaped recess 22.

Since the cable is nowhere visible and the variation in the shape of the key and the key channel, if present, can be very small, such a security lock according to the invention cannot be distinguished externally from a conventional cylinder lock.

Claims

PATENT CLAIMS

1. Security lock with cylinder (Z) rotatable in a housing (S) and e or more tumblers with locking bolts (L, M, N), which are set up to engage channels of the cylinder (Z) and thus the rotation of the cylinder (Z ), characterized in that at least one of the tumblers (1,

2, 3) contains an electrically controlled sensor which reacts to impermissible interventions, in particular movements of the lock or heating.

2. Security lock according to claim 1, characterized in that the end of the tumbler (1, 2, 3) facing away from the cylinder (Z) is connected to an electrical reference potential (U.REF) which is different from the potential (MASS) of the housing ( S) differs.

3. Security lock according to claim 2, characterized in that the locking bolts (L, M, N) are acted upon by springs (E) in the direction of the cylinder (Z), the springs (E) locking bolts with the reference potential (U.REF) connect.

4. Security lock according to claim 3, characterized in that each spring (E) is assigned a threaded screw (W) for adjusting the spring travel.

5. Security lock according to one of claims 3 or 4, characterized in that the locking bolts and the springs (E) are each surrounded by a non-conductive sleeve (G).

6. Security lock according to one of claims 3 or 4, characterized in that the locking bolts and the springs (E) in channels (16) of a one-piece insulator body (14) are received.

7. Security lock according to one of claims 1 to 6, characterized in that the sensor m one of the locking bolt (N) is a pressure sensor (A, C, D) which in pressure Direction of displacement of the locking bolt reacts.

8. Security lock according to claim 7 and one of claims 2 to 6, characterized in that the pressure sensor comprises a housing potential (DIMENSION) lying bridging element (D) and em non-conductive intermediate piece (A), the bridging element against that in the unloaded state of the pressure sensor Isolated reference potential, wherein the bridging element (D) can be moved past the intermediate piece (A) by pressure in the direction of displacement and brought into contact with the reference potential in order to close a circuit.

9. Security lock according to claim 8, characterized in that the bridging element (D) is a sleeve into which the intermediate piece can be inserted against the force of a spring (C) arranged in the sleeve.

10. Security lock according to one of claims 2 to 9, characterized in that at least e locking bolt contains e resistance element which defines the difference between the reference (U.REF) and housing potential (MASSE).

11. Security lock according to claim 10, characterized in that the resistance element is a Zener diode.

12. Security lock according to one of claims 2 to 6, characterized in that the locking bolt (M) has a cylinder (Z) facing, at reference potential (U.REF) and isolated against the cylinder projecting tip.

13. Security lock according to claim 12, characterized by an on the outer surface of the cylinder (Z) circumferential groove (P) into which the tip of the locking bolt (M) engages.

14. Security lock according to one of the preceding claims, characterized in that the surfaces of the electrical contacts are corrosion-free, in particular gold-plated or chrome-plated are .

15. Security lock according to one of the preceding claims, characterized in that outgoing cables from the at least one sensor are guided on the lock body to the protective room side over the weak point of the middle part of the lock and are connected or fastened there to the further cable connection.

16. Security lock according to claim 15, characterized in that in a recess (22) of the housing (10) e connector (24) is arranged for connection to the continuing cable connection.

17. Security lock according to one of the preceding claims, characterized in that different locking bolts are interchangeable.

18. Security lock according to one of the preceding claims, characterized by a monitoring circuit which triggers an alarm when a signal from a sensor, which indicates an unauthorized intervention, lasts longer than a predetermined period of time.

19. Security lock according to claim 18, characterized in that the predetermined period of time can be set to zero, so that an alarm is triggered when a supplementary or original key is imported into the lock.