EP2818611A2 - Safety device for locking cylinders - Google Patents

Abstract

In a safety device for lock cylinder with a handle (1), in particular knob, which is freely rotatable in the idle state and in the opening or closing state with a locking member of the lock cylinder, comprising a blocking device, which from a defined number of revolutions of the handle (1 ) blocks the further rotational movement of the handle (1) in the time unit, the blocking device has a blocking member (11) which is received in a circumferentially extending groove (12) of a stationary part of the lock cylinder (9) and in the groove ( 12) between a rotation of the handle (1) permitting release position and a rotatability of the handle (1) blocking the blocking position is movably guided, wherein the blocking member (11) in the blocking position radially from the groove (12) protrudes and with a stop ( 15) of a with the handle (1) co-rotating counter member (2) cooperates.

Description

The invention relates to a safety device for lock cylinder with a handle, in particular knob, which is freely rotatable in the idle state and in the opening or closing state with a locking member of the lock cylinder, comprising a blocking device, which from a defined number of revolutions of the handle in the unit of time blocked the further rotational movement of the handle.

The invention further relates to a lock cylinder equipped with such a safety device with a lock cylinder housing, a locking member and a handle, in particular knob, which is freely rotatable in the idle state and in the opening or closing state with the locking member of the lock cylinder can be coupled.

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. In electronic security systems, a recognition logic and an electronic key in the form of cards or other identification media replace the key. After reading the electronic key, which corresponds to the mechanical scanning of a conventional key, the rotational movement of a handle, such as a knob or handle via a corresponding coupling with another rotatably mounted part rotatably coupled, which actuates the latch in the sequence. 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 rotary motion this outer rotatable part is made by recognizing the correct key via an electronics usually by electrical means by coupling a coupling element. In such devices, the external handle is freely rotatable without such a coupling. This freely rotatable handle is connected via a shaft to the opposite side of the door or the window on which the coupling is made with the actuator of the lock. The shaft is thereby passed with relatively little play through the lock cylinder, 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. 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 identification medium, an access authorization is determined, wherein a clutch is actuated electromagnetically in such a way that a locking bit can be moved from the outside door-side rotary 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, which quickly in the handle Rotation offset. In such a rapid rotation, a corresponding frictional heat is generated in the interior of the lock, which can lead to a rubbing or unintentional coupling of an outer shaft with an inner shaft upon expansion of the usually freely spinning shaft, so in this way despite missing electronic Release of the clutch by mechanical means is achieved by thermal expansion or trituration coupling between the usually freely rotatable handle and the pawl, whereby the lock can be operated. However, such incorrect operation or sabotage operation requires that the freely rotatable handle can be brought over a minimum time to a corresponding minimum speed, which can lead to thermal expansion or trituration.

To exclude such a sabotage or incorrect operation and at the same time to ensure that the freely rotatable handle remains freely rotatable only with a relatively low rotational speed and counteracts rubbing or jamming in other cases, is in the WO 2007/095652 A1 already a safety device of the type mentioned above has been proposed in which at least one radially guided displaceable centrifugal weight is coupled to the handle, which engages from a defined number of revolutions of the handle in a time unit with a stationary part of the lock and blocks the further rotational movement , The centrifugal lock ensures that if the speed of the freely rotatable handle is too high, a blockage occurs immediately.

In a safety device in the WO 2007/095652 A1 However, the correct operation, especially in those cases can not be guaranteed with certainty in which a particularly high torque is applied to the handle. In this case, there is the danger that the elements displaceable due to the centrifugal force are mechanically overloaded and subsequently destroyed.

The invention therefore aims to improve a safety device of the type mentioned in that the functionality is ensured even at very high rotational speeds and high torques that are applied to the handle. The safety device should function largely independently of the external forces acting on the lock forces.

To solve this problem, the invention provides according to a first aspect in a safety device of the type mentioned that the blocking device has a blocking member which is received in a circumferentially extending groove of a stationary part of the lock cylinder and in the groove between a rotation the handle permitting release position and the rotatability of the handle blocking blocking position is guided movably, wherein the blocking member in the blocking position protrudes radially out of the groove and cooperates with a stop of a co-rotating with the handle counter member.

The fact that the blocking member is received in the stationary part of the lock cylinder, the blocking member is mechanically decoupled at least in the release position of the handle or the rotatable with the handle component, so acting from the outside on the handle and the handle possibly connected to the shaft Forces can not be transferred to the responsible for the blocking part, namely on the blocking member of the blocking device. Manipulation or damage due to violence is thus made more difficult. The blocking member is thus structurally separated in particular in the release position structurally from the handle or the non-rotatably connected to the handle member and in particular does not rotate with the handle. Only in the blocking position, the blocking member acts with the handle or one with the handle rotatably coupled part together to block the further rotational movement.

The mechanical decoupling of the rotational movement of the handle of the blocking member is preferably achieved in that the displacement of the blocking member from the release position to the blocking position by non-contact or indirect coupling with the rotational movement of the handle. The non-contact or indirect coupling is preferably carried out in that the rotational movement of the handle or the counter-member rotatably coupled to the handle generates a flow in a medium, such as. a flow of air which drives or entrains the blocking member.

The blocking of the rotational movement of the handle according to the invention is such that the blocking member passes in the blocking position in a radially out of the groove outstanding position in which it cooperates with a stop of a co-rotating with the handle member. This can be realized structurally particularly advantageous in that the blocking member from the release position is radially inwardly displaceable in the blocking position. The blocking member may preferably dip in the blocking position in a recess or groove of the counter member, wherein the trailing in the direction of rotation boundary surface of the groove forms the stop for the blocking member.

In a structurally particularly simple manner, the counterpart is designed as a rotatable with the handle shaft or sleeve. The stationary part is preferably formed by a lock cylinder housing, in which the counter member is rotatably mounted.

In order to keep the blocking member in the rest position of the handle independently in the release position or to bring there, it is preferably provided that the blocking member is arranged in the release position at the lowest point of the groove, which preferably lies in a vertical longitudinal center plane of the lock cylinder. Due to gravity, it is ensured that the blocking member comes to rest at the said lowest point when no other forces act on the blocking member.

In order to ensure correct operation of the blocking device in both right-handed handle as well as left-handed handle, it is preferably provided that the groove extending from the lowest point starting in two opposite directions, the depth of the groove with increasing distance from the lowest point respectively continuously reduced. The continuously decreasing depth of the groove provides positive guidance of the blocking member such that it is displaced radially inwardly as the lateral deflection progresses until it reaches the blocking position in which it cooperates with the abutment of the counterpart member to block rotational movement.

The indirect drive of the blocking member by means of a flowing fluid is realized in a particularly preferred manner that the groove forms a channel together with the outer periphery of the co-rotating counter member, in which the blocking member by the resulting by the rotation of the counter member flow, in particular draft, in the direction of rotation is dragged along.

Advantageously, the blocking member is formed by a ball.

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 cylinder according to the invention in teilzerlegtem state and the 2 to 5 simplified cross-sectional views taken along the line II-II of Fig. 1 with the blocking member in different positions.

In Fig.1 is denoted by 1 a knob which is freely rotatably connected via a designed as a hollow shaft counter member 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 counter-member 2 and the coupling shaft 3 connected thereto can be freely rotated. In the area of the counter member 2 and the coupling shaft 3, a blocking device not shown is now arranged, which blocks the further rotational movement of the knob 1 at a rapid rotation of the knob 1 about the rotation axis 10.

The above-mentioned blocking device is in the sectional views according to the FIGS. 2 to 5 closer. In this case, the stationary lock cylinder housing is designated 9, in which the rotatably connected to the knob 1 counter-member 2 is rotatably mounted. The blocking device has a blocking element 11 designed as a ball, which is received in a groove 12 formed in the housing 9. The groove 12 has in the longitudinal center plane 14 to the lowest point, so that the blocking member 11 in the resting state of the knob 1 and the shaft 2 in the in Fig. 2 position shown. The depth of the groove 12 is selected in the region of the longitudinal center plane 14 so that the blocking member 11 does not protrude from the groove 12 and therefore does not come into contact with the rotating counter-member 2, as in Fig. 3 is shown. The groove 12 is formed like a sickle and has the greatest depth in the region of the longitudinal center plane 14, wherein the groove depth of the longitudinal center plane 14 decreases continuously in both directions.

When the counter-member 2 is rotated at a high rotational speed, for example by attaching a drill to the knob 1, an air flow is created in the groove 12 which entrains the blocking member 11 in the direction of rotation of the counter-member 2, as shown in FIG Fig. 4 is shown. Due to the tapered depth of the groove 12, the blocking member 11 emerges from the groove 12 ( Fig. 4 ) so that it collides with the rotating shaft 2. The counter-member 2 has at its outer periphery also has a groove 13 which lies in the same cross-sectional plane as the groove 12. Once the blocking member 11 protrudes from the groove 12, it is taken from the end face 15 of the groove 13 in the direction of rotation. Once the blocking member 11 was taken to the stop 16 of the groove 12, resulting in the Fig. 5 illustrated blocking position in which the blocking member is trapped between the stops 15 and 16 and thereby blocks the further rotational movement of the counter member 2.

Once the counter 2, starting from the in Fig. 5 shown blocking position, is turned back, the blocking member 11 passes automatically due to gravity in the Fig. 2 shown position so that the blocking device is ready for use again. It is thus apparent that the blocking device without separate reset elements, such as spring elements or the like, gets along, so that the operational capability is given over a very long time.

Claims (10)

Safety device for lock cylinder with a handle, in particular knob, which is freely rotatable in the idle state and in the opening or closing state with a locking member of the lock cylinder, comprising a blocking device, which from a defined number of revolutions of the handle in the time unit, the further rotational movement of the Blocked handle, characterized in that the blocking device comprises a blocking member (11) which is received in a circumferentially extending groove (12) of a stationary part of the lock cylinder (9) and in the groove (12) between a rotatability of the handle (1) permitting release position and the rotatability of the handle (1) blocking blocking position is guided, wherein the blocking member (11) in the blocking position radially from the groove (12) protrudes and with a stop (15) of the handle (1 ) co-rotating counter-member (2) cooperates. Safety device according to claim 1, characterized in that the blocking member (11) from the release position radially inwardly into the blocking position is displaceable. Safety device according to claim 1 or 2, characterized in that the blocking member (11) in the blocking position in a recess or groove (13) of the counter member (2) is immersed. Safety device according to claim 1, 2 or 3, characterized in that the counter-member (2) as with the handle (1) co-rotating shaft is formed. Safety device according to one of claims 1 to 4, characterized in that the stationary part of a lock cylinder housing (9) is formed, in which the counter-member (2) is rotatably mounted. Safety device according to one of claims 1 to 5, characterized in that the blocking member (11) in the release position at the lowest point of the groove (12) is arranged, which is preferably in a vertical longitudinal center plane (14) of the lock cylinder. Safety device according to one of claims 1 to 6, characterized in that the groove (12) extending from the lowest point in two opposite directions, wherein the depth of the groove (12) decreases continuously with increasing distance from the lowest point. Safety device according to one of claims 1 to 7, characterized in that the groove (12) forms, together with the outer periphery of the co-rotating counter-member (2) a channel in which the blocking member (11) by the by the rotation of the counter-member (2) Flow is dragged in the direction of rotation. Safety device according to one of claims 1 to 8, characterized in that the blocking member (11) is formed by a ball. Lock cylinder with a lock cylinder housing, a locking member and a handle, in particular knob, which freely rotatable in the idle state and in the opening or closing state with the locking member of the lock cylinder can be coupled characterized by a safety device according to one of claims 1 to 9.

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