EP1987218B1 - Lock with safety system - Google Patents

Abstract

In a security device for locks comprising a grip portion or knob (1) which is freely rotatable in the resting state and can be coupled to the locking member (7) of the lock in the open or closed state, a radially guided displaceable flyweight (13) is coupled to the grip portion or knob (1), which engages with a fixed portion (11) of the lock (12) and blocks any further rotary movement above a defined number of revolutions of the grip portion or knob (1) per unit time.

Description

The invention relates to a lock with a safety device and a handle part or knob which is freely rotatable in the idle state and in the opening or closing state with the locking member of the lock, wherein the or the centrifugal weight (s) from a first detent position radially be displaced outwards into a second latching position.

Such a lock with a safety device is from the CA 2,097,992 known.

Conventional locks can be operated by means of a key, by turning a key in a lock a corresponding locking lug is rotated, which moves a bolt in a closed position or retracts from a closed position to an open position. Electronic security systems use a recognition logic and an electronic key in the form of cards, key fobs or other identification media instead of the key. After reading the key, which corresponds to the mechanical scanning of a conventional key, the rotational movement of a knob or handle via a corresponding coupling with another rotatably mounted part rotatably coupled, which operates in the sequence the bolt. In this context, electronic security systems have become known, which are designed as a double-knob cylinder, wherein on one side of the door to be opened elements of a detection logic, and in particular antennas or the like., Are arranged, whereas the coupling of the rotational movement of this outer rotatable part after detecting the correct key via an electronics usually made by electrical means by coupling a coupling element. In such devices, the external knob or handle is freely rotatable without such a coupling. This freely rotatable knob or handle is connected via a shaft to the opposite side of the door or window, at which the coupling is made with the actuator of the lock. The shaft is thereby passed through the castle with relatively little play, the free rotation at the same time relatively little play without the risk of jamming and without the risk of unintentional coupling must be guaranteed. Devices of this type are known, for example, as transponder locking systems for cabinets and value compartments. A possible training is for example the DE 19851308 A1 can be seen in which the lock cylinder is provided on both sides with Drehknäufen, of which the inside door knob has access control electronics. Depending on the identification of an identifier, the access authorization is assigned, wherein a clutch is actuated via an electromagnet such that a cam can be moved from the outside door side knob.

Due to the low tolerances in the production of such safety devices but has now been shown that a possible improper manipulation is created by the fact that a corresponding drive unit, such as an electric motor or spring mechanism motor is connected to the freely rotatable handle or knob, which the handle part or Knauf in rapid rotation. In such a rapid rotation, a corresponding frictional heat is generated in the interior of the lock, which can lead to rubbing or inadvertent coupling of an outer shaft with an inner shaft upon expansion of the usual way freely spinning shaft, so in this way, despite the lack of electronic release of the clutch mechanically obtained by thermal expansion or trituration coupling between the usual manner freely rotatable handle part or knob and the pawl is formed, whereby the lock can be operated. However, such incorrect operation or sabotage operation requires that the freely rotatable handle or knob over a minimum time to a corresponding Minimum speed can be brought, which can lead to thermal expansion or trituration.

The invention now aims to exclude such sabotage or incorrect operation with certainty and to ensure that the freely rotatable handle part or the freely rotatable knob remains freely rotatable only with a relatively low rotational speed and counteracts rubbing or jamming in other cases.

To solve this problem, the solution according to the invention is that the flyweight or the flyweight (s) are displaced radially outwardly from a first detent position into a second detent position, whereby a precise function is ensured.

The fact that a centrifugal force lock is arranged inside the lock, it is now ensured that at high speed of the freely rotatable handle or knob directly blockage takes place, the coupled with the handle or knob centrifugal weight at its guided in the radial direction movement with a stationary part of the lock engages and blocks the further rotation. Due to the radial guidance and high blocking forces can be absorbed with small centrifugal weights.

According to a preferred embodiment of the lock according to the invention, the design is such that the handle part or knob is connected to a dipping into the housing of the lock shaft having at least one radial opening in which a centrifugal weight is arranged with a lying outside the axis of rotation center of gravity and that in the housing of the lock, a recess or groove is arranged, in which the flyweight dips in a radial movement of the same. In such a construction, the flyweight is in one held eccentric rest position so that a well-defined centrifugal force is sufficient to move it from this rest position in a radially outward locking position. In a particularly simple manner, the training may in this case be such that the centrifugal weight is mounted in a slot of the shaft, wherein preferably the shaft is formed as a hollow shaft and rotatably connected to a lock passing through the coupling shaft for the coupling with the locking member of the castle. The storage of the centrifugal weight in the hollow shaft, which is itself connected to the coupling shaft, at the same time ensuring the corresponding eccentric position of the centrifugal weight in the rest position or starting position.

In order to keep the friction losses of the centrifugal weight as low as possible and to ensure a defined starting position, the training is advantageously taken to ensure that the centrifugal weight is held with the interposition of resilient locking balls in the slot of the shaft.

The exact position can be ensured in two positions of the centrifugal weights in a particularly simple manner that are provided on the walls of the elongated hole grooves for the engagement of the locking balls in a radially inner rest position and a radially outer locking position.

A safe return of the flyweights from their locked position to the rest position can be achieved that the radially displaced flow weights each have beveled edges in axial section over which the flyweights by turning against the locking effecting direction of rotation of the radially outer detent position in the radially inner rest position can be pressed, preferably bearing in the circumferential direction adjacent or opposite centrifugal weights inclined surfaces, which cause a release of the blockade only in two rotational movements in the opposite direction of rotation.

The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. In this show Fig.1 a schematic overall view of a lock according to the invention in teilzerlegtem state, Fig.2 an enlarged view of the flyweight hollow shaft, Figure 3 an embodiment of such a flyweight and Fig.4 and Fig.5 Sectional views by preferred embodiments of centrifugal weights.

In Fig.1 is denoted by 1 a knob, which is freely rotatably connected via a hollow shaft 2 and a coupling shaft 3 with a housed in another knob 4 electromechanical clutch disc. The clutch disc itself may be formed in any desired manner and, for example, magnetically or mechanically coupled with a corresponding component, such as the knob 4. The actuating shaft is denoted by 5 and is penetrated by a sliding sleeve 6. Furthermore, a locking lug 7 is provided for the operation of the lock bolt, said locking lug 7 is held in the axial direction adjusted by corresponding snap rings 8 and rotatably connected to the actuating shaft 5, which in turn rotatably with the inside knob 4 or after the coupling rotatably connected to the clutch shaft 3 is connected.

Without a corresponding coupling of the actuating shaft 5 with the knob 1, the hollow shaft 2 and the coupling shaft 3 connected thereto can be freely rotated. The hollow shaft 2 now has a slot 9, in which a centrifugal weight is inserted, which is spent in a radially outward position with a rapid rotation of the knob 1 about the rotation axis 10 and in this position with a groove 11 in the interior of the lock housing 12 Engage can. In this position, the further rotation of the knob 1 is blocked around the axis 10.

In the illustration after Fig.2 the hollow shaft 2 is shown enlarged. In the slot 9, a flyweight 13 is used, as in Figure 3 is shown enlarged. This flyweight 13 carries resilient balls 14, which can engage in groove-like recesses 15 in the interior of the elongated hole 9 in order to ensure a secure rest position. By rotation of the hollow shaft 2 about the axis 10, a displacement of the centrifugal weight 13 is effected in a radially outward position at an appropriate speed, in which then an entry of the centrifugal weight 13 can be made in the groove 11 of the lock housing 12 and the blockage is effected.

In the presentation after 4 and 5 are two centrifugal weights 13 shown in section and guided in the slot 9. The detent balls are a spring 16 in the in Figure 4 apparent groove-like recesses 15 pressed, where for in Figure 4 Rest position of the centrifugal weights shown above and for the radially outwardly displaced locking position, as in Figure 4 is shown below, separate groove-like recesses or grooves 15 are provided.

In Figure 5 is in the cross section of the flyweights depending on an oblique edge 17 can be seen, via which the flyweights 13 can be locked by pivoting in the direction of the double arrow 18 each again in the radially inner rest position.

Claims (8)

1. Lock having a security device comprising a grip portion or knob which is freely rotatable in the resting state and can be coupled to the locking member of the lock in the open or closed state, wherein at least one radially guided displaceable flyweight (13) is coupled to the grip portion or knob (1), which engages with a fixed portion (11) of the lock and blocks any further rotary movement above a defined number of revolutions of the grip portion or knob (1) per unit time, characterised in that the flyweight or flyweights (13) can be displaced from a first locking position radially outwards into a second locking position.
2. Lock according to claim 1, characterised in that the grip portion or knob (1) is connected to a shaft (2) which dips into the housing of a lock, which has at least one radial opening (9) in which a flyweight (13) is arranged with a centre of gravity located outside the axis of rotation (10) and that a recess or groove (11) is arranged in the housing (12) of the lock into which the flyweight (13) dips during a radial movement of the same.
3. Lock according to claim 1 or 2, characterised in that the shaft is configured as a hollow shaft (2) and is connected rotationally fixedly to a coupling shaft (3) which passes through the lock for coupling with the locking member (7) of the lock.
4. Lock according to any one of claims 1 to 3, characterised in that the flyweight (13) is mounted in an elongated hole (9) of the shaft.
5. Lock according to any one of claims 1 to 4, characterised in that the flyweight (13) is held in said elongated hole (9) of the shaft (2) with interposed spring-mounted locking balls (14).
6. Lock according to any one of claims 1 to 5, characterised in that grooves (15) for engagement of the locking balls (14) in a radially inner resting position and a radially outer locking position are provided on the walls of the elongated hole (9).
7. Lock according to any one of claims 1 to 6, characterised in that the radially displaced flyweights (13) each have bevelled edges (17) in the axial section, by which means the flyweights (13) can be pressed from the radially outer locking position into the radially inner resting position by turning in the direction opposite to the direction of rotation effecting the locking.
8. Lock according to claim 7, characterised in that neighbouring or opposite flyweights (13) in the circumferential direction preferably have sloping surfaces (17) which only effect a release of the blocking during two rotating movements in respectively opposite directions of rotation.

Images