DE102020117853A1 - Mechatronic lock and key system - Google Patents

Abstract

Mechatronic lock/key system, comprising a lock cylinder and a cylinder core which is rotatably mounted in the lock cylinder housing, which has a key channel for inserting a key (2) and with a device for generating electrical energy in the lock cylinder (1) by means of a movement of the key in the Key channel of generator drive converting into rotation (5),
whereby
the generator drive (5) can be rotated by the linear movement of a displaceable toothed rack (4), which is axially spring-loaded and which tensions the axially arranged compression spring (6) when the key is pulled out of the keyway, taking the toothed rack (4) with it, while Insertion of the key in the key channel, the pressure spring (6) is released and the rack (4) is linearly displaced, causing the generator drive (5) to rotate.

Description

The invention relates to a mechatronic lock/key system, comprising a lock cylinder and a cylinder core which is rotatably mounted in the lock cylinder housing and has a key channel for inserting a key and with a device for generating electrical energy in the lock cylinder by means of a movement of the key in the key channel in Rotation converting generator drive.

Such a generator drive is from DE3208818 known, in which case a toothed rack meshing with the generator pinion is provided, which is displaced against a compression spring when the key is inserted. When the key is pulled out, the spring pushes the toothed rod back again.
The disadvantage here is that the rotation of the generator drive is only influenced by the movement speed that the user exerts on the toothed rack, ie when inserting the key against the pressure of the spring and when removing it by the pressure of the spring.
Consistency and even energy generation is therefore not guaranteed.

A mechatronic locking cylinder contains electronics that query the user's locking authorization. This query can be carried out in addition to mechanical scanning or can serve as the sole security feature. Authentication can take place using RFID2, inductive coupling or separate electronic contacts.

Locking systems of all sizes are suitable as areas of application. Most locking systems have two significant weaknesses: on the one hand, the constant change in dynamic companies and organizations, on the other hand, the frequent loss of keys, which causes a lot of work and considerable costs as well as a high loss of security.

• • leichtes Sperren verlorener Schlüssel
• • leichtes Ändern von Zutrittsberechtigungen
• • Zentral- oder Fernüberwachung
• • zeitliche Eingrenzung von Zutrittsberechtigungen
• • Protokollierung von Schließvorgängen
• • Koppelung der Schließvorgänge an bestehender Gebäudetechnik

In addition to pure access organization, a mechatronic locking system also offers the following advantages:

• • easy blocking of lost keys
• • easy changing of access authorizations
• • Central or remote monitoring
• • Time limitation of access authorizations
• • Logging of locking processes
• • Coupling of the closing processes to the existing building technology

Today, battery-powered systems prevail, which without restrictions - such. B. the laying of cables - can be included in existing locking systems. In these systems, the battery is installed either inside the lock cylinder or in the key bow. A typical service life of a battery is around 50,000 locking processes.

A lock cylinder with electronic authentication that does not require an external voltage source or primary cell is known. The cylinder contains a gear train and an electric motor that operates both as a generator and as a motor. Insertion of the key pivots a lever inside the cylinder, which moves a segment gear of the gearbox against a torsion spring. As the key is continuously inserted, the lever slides over the segment gear and the energy stored in the torsion spring drives the motor pinion via the gear. The resulting voltage is temporarily stored by the circuit board in a capacitor and used directly for communication.

The use of the torsion spring to ensure the minimum energy often leads to breaks in contact, since the user instinctively tries to overcome the increased insertion resistance by applying greater force. If the threshold value is then exceeded, the user no longer feels any counterforce and the key is pushed in very quickly to the end position.

The object of the invention is to create a mechatronic lock/key system that does not require battery operation because the necessary energy is generated from the movement of the key, with the aim of avoiding the above disadvantages.

This object is achieved according to the invention with a mechatronic lock/key system comprising a lock cylinder and a cylinder core which is rotatably mounted in the lock cylinder housing and has a key channel for inserting a key and with a device for generating electrical energy in the lock cylinder by means of a movement of the key generator drive converting into rotation in the key channel, whereby the generator drive can be set in rotation by the linear movement of a displaceable toothed rack, which is axially spring-loaded and which tensions the axially arranged compression spring when the key is pulled out of the key channel, taking the toothed rack with it, while when the key is inserted into the pressure spring is relaxed in the key channel and the rack is linearly displaced, causing the generator drive to rotate.

In order to generate an amount of energy that is independent of use but constant, a mechanical intermediate store (spring) is used according to the invention. The spring is tensioned by removing the key and locked in its tensioned position. If a key is now inserted into the lock cylinder, the lock is released and the energy stored in the spring drives a generator whose energy is stored in a capacitor for further use by the electronics.
Since the relaxation of the spring is always the same when the key is removed, the same amount of energy is always generated, stored and made available when the key is inserted, regardless of the user.

Preferred further developments result from the dependent claims.

The invention will be explained below with reference to the schematic drawings.

Is shown in the 1 the state after removing the key, in which case the rack 4 against the pressure of the spring 6 - has been taken - to the left - so that the spring 6 tensioned. The system of spring 6 and toothed rack 4 is held in the tensioned state by a lock.

If the key 2 is inserted into the lock channel of the lock cylinder 1, the engagement hook 3 follows the contour of the housing due to its shape. The movement is from the 1 and 2 as can be seen, whereby this causes the engagement hook 3 to descend through contact with the driver 7. The engagement hook is always returned to the starting position by a torsion spring.

With further insertion of the key 2, the lock is released. In doing so, an edge of the key presses on a surface of the lock 8 which is at an angle. The lock 8 is thereby pushed back. The tribological contact of the lock with the driver 7 of the toothed rack 4 is canceled and the spring relaxes ( 2 )..

If the key is removed, the user pulls the toothed rack 4 with him through the contact between the two parts mentioned and thus tensions the spring 6. The lock secures this position.

The release of the coupling between the engagement hook and the key is done by submerging the engagement hook. As soon as the rack 4 is no longer coupled to the engagement hook 3, it is pressed against the lock by the compression spring. The spring is now in the state where triggering can occur.

An embodiment of the locking mechanism is in 3 shown.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 3208818 [0002]

Claims (4)

Mechatronic lock - key - system, comprising a lock cylinder and a cylinder core which is rotatably mounted in the lock cylinder housing and has a key channel for inserting a key (2) and with a device for generating electrical energy in the lock cylinder (1) by means of a movement of the key in the Key channel of generator drive converting into rotation (5), whereby the generator drive (5) can be set in rotation by the linear movement of a displaceable toothed rack (4), which is axially spring-loaded and which tensions the axially arranged compression spring (6) when the key is pulled out of the keyway, taking the toothed rack (4) with it, while during When the key is inserted into the keyway, the compression spring (6) is relaxed and the toothed rack (4) is linearly displaced, causing the generator drive (5) to rotate. Mechatronic lock - key - system after claim 1 , characterized in that on the key a pivotable driver which can be brought into engagement with a rigid driver (7) arranged on the toothed rack (4) is provided as an engagement hook (3). Mechatronic lock/key system according to one of the preceding claims, characterized in that a locking mechanism which can be actuated by a control edge on the key and releases the movement of the toothed rack (4) is provided. Mechatronic lock-key system according to one of the preceding claims, characterized in that the tensioned compression spring is locked and the locking is released when the key is inserted into the key channel.

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