RU2020588C1 - Method of annunciating of trespass and device for forming alarm signal of trespass - Google Patents

Abstract

FIELD: guard systems; signalling systems. SUBSTANCE: when trying open lock by master-key and after the master-key is put into lock hole, somebody wants to turn cylinder 6. But as cylinder 6 is tied with case 4 by pins, the cylinder rotates together with the case for angle α till achieving rest of movable protrusion 12 with motionless protrusion 3; in this case resistance of spring element 13 is overcome. The fact of shift of protrusion 12 has to be the primary signal of feeble attempt of stranger into the room under guard. After the master-key is pulled out of lock hole both movable units (case 4 and cylinder 6) return to initial position. EFFECT: improved reliability. 2 cl, 3 dwg

Description

 The invention relates to locking devices and can be used in locks designed to protect critical facilities, such as apartments, public buildings, warehouses, garages, etc.

 A known method of signaling an attempt to penetrate into a room whose door is locked, by issuing an electrical signal when trying to open the lock with a master key. The combination lock for implementing the known method comprises an electronic circuit (including logic elements) and a key electrically coupled to the circuit. When using a foreign key (master key), the prohibition on opening the lock and the circuit for issuing an alarm are triggered (see, for example, ed. St. USSR N 482779, class. G 08 B 13/08, 1974).

 This method requires the availability of power, which complicates the method and limits its scope.

 There is another way of signaling an attempt to penetrate into a room, the door of which is locked, which consists in the fact that before opening the lock when trying to enter the room, they act on the movable element associated with the lock and move it, while moving the movable element is used as the primary signal about an attempt to enter the room.

 The essence of this method lies in the fact that before opening the lock, move the movable element (movable plate), which includes an alarm circuit with a delay time for operation, open the lock with a key during the exposure time, then enter the unlocked room and turn off the alarm if the alarm if it is not turned off (the lock will not be opened), then after the exposure time the circuit is triggered and gives an electrical signal about an unauthorized person attempting to enter the guarded room.

 To implement the method, there is a safety device against breaking the door lock into the room, which contains electronic signaling means with an electric switch for signaling an alarm and a time delay unit and alarm control means in the form of a movable plate (movable element) interacting with the electric switch, while the plate is installed on the outside of the door, blocking the lock (see USSR patent N 1393315, class G 08 B 13/06, 01/14/83).

 This method is adopted as a prototype. Compared to the analogue, it is simpler, since the use of electricity is not necessary in it, since the movable element of the device that implements it can optionally include an electrical circuit: a plate can turn on any mechanical alarm device, for example, a bell with a clockwork spring and a response time delay (analog such a call are the alarm clock).

 However, this method and the apparatus implementing it have disadvantages. The mandatory presence of a time delay complicates the method, especially with a mechanical delay. During the exposure time (and its duration is known), you can try several pre-prepared master keys, keys and have time to open the lock of one of them and turn off the alarm, which reduces the effectiveness of the method. The movable plate closing the keyhole is a great temptation for teenagers (and not only for them) to put it aside and cause a false alarm or to break off this plate altogether and throw it away, therefore this device is unacceptable in our country. The low reliability of the device, bordering on its inoperability, is explained by the fact that in the known device the movable element is located outside the lock, directly on the door next to the lock, therefore access to the keyhole of the lock without triggering an alarm can be obtained in the most elementary way: for this, the right part of the plate is enough (adjacent to the keyhole) to saw off with a hacksaw, bite off with pliers or even easier - bend with pliers.

 The aim of the invention is to increase the reliability of signaling.

 In FIG. 1 shows a device for issuing a primary signal, a longitudinal section; in FIG. 2 - the same, rear view device; in FIG. 3 - key for cylinder lock.

 A device for issuing a primary signal consists of two main parts: a fixed base 1 with a flange on which protrusions 2 and 3 are made, as well as holes for its fastening to the inner side of the door (Fig. 2), and a code element that contains a housing 4 s spring-loaded pins 5, inside of which a cylinder 6 with a channel 7 (keyhole) for a key and pins 8 is placed, and a protrusion 9 is made along the channel 7, preventing the pins from slipping 8. The device has a faceplate 10 attached to the base 1 with a figured key slot and the driver 11 that interacts with the dead bolt lock. At the end of the housing 4, a protrusion 12 is fixed, which performs the function of a movable stop and gives out a primary signal about an attempt to open the lock with a master key. The ends of the spring element 13 are connected to the protrusions 2 and 12. The key of the lock code device is made in the form of a plate with code cutouts 14 and a cutout 15, which prevents the key from being removed from the keyhole in the intermediate position of the key. The code element and the base 1 are connected by a spring element 13 and are kinematically connected with the output contact (not shown in the figures).

 When an outsider tries to enter the premises, the proposed method is implemented in the following sequence: a master key is inserted into the keyhole, the mechanical element of the lock code device is moved by a mechanical action on the master key, the above movement of the mobile element of the code device is carried out by a distance (by an angle), less distance (less than the angle) by which this movable element is moved when opening the lock with a key.

The device has two moving elements: movable element code lock device, which is a cylinder 6 when opening the lock key he rotates relative to the housing 4 by an angle α ₁ ^of ≈90 and the movable member of the apparatus to which the cylinder 6 and bonded to it by pins case 4, when trying to open the lock with a master key, it rotates relative to the base 1 by an angle α≈5-10 ^about .

 The device operates as follows.

 In the initial position, the cylinder 6 is inhibited by the pins 5, the lock is closed. To open the lock with a key, the key is inserted into the keyhole all the way, while the pins 8 are lifted by the key cutouts 14 of the key to heights that release the cylinder 6 from the housing 4, then the key is turned counterclockwise, the unlocked cylinder 6 is turned along with the key, and its leash 11 acts on the bolt of the castle, opening it.

 When trying to open the lock with a master key after inserting the master key into the keyhole, they also try to turn the cylinder 6, but since it is connected by pins to the body 4, together with the cylinder 6 the body 4 is also rotated (overcoming the resistance of the spring element) by an angle α to the stop of the movable of the protrusion 12 into the stationary protrusion 3, while the fact of the movement of the protrusion 12 and its interaction with the output contact is a signal of an unsuccessful attempt to penetrate an unauthorized person into the protected room. After removing the master key from the keyhole, both movable elements under the action of the spring element 13 occupy the initial position.

To ensure the operability of the device, the following conditions must be met: when opening the lock with the key F _pr > F _c when trying to open the lock with a master key to reverse the movable element to its original position F _pr >> (F _to + F _p ), where F _pr is the spring tension element 13; F _n - force of friction between the mating surfaces of a cylinder 6 and the housing 4; F _to - the friction force of the mating surfaces of the housing 4 and base 1; F _p - the friction force in the mechanical joints of the lock bolt.

Claims (2)

 1. The signaling method of an attempt to enter a room whose door is locked, that is, when a key is inserted into the lock, the code combination of the key is compared with the code combination of the lock, the decoding device of the lock is driven by the key, and an alarm signal is generated, characterized in that, in order to increase the reliability of the alarm, the formation of an alarm signal is produced when the key code does not match the lock code by turning the encoder angle less than the unlocking angle of the lock.  2. A device for generating an alarm signal about an attempt to enter a room containing a movable element arranged to interact with an output contact, a lock in which a code element is placed, in whose case a cylinder with a keyhole is placed coaxially with it, characterized in that a base, a spring element, a code element is mounted on the base rotatably relative to the axis of the cylinder, a code element and a base are connected by a spring element, the movable element being Yen in the form of a protrusion mounted on the housing of the code element.

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