Locks – Operating mechanism – Using a powered device
Patent
1996-02-22
1997-12-23
Gall, Lloyd A.
Locks
Operating mechanism
Using a powered device
70276, E05B 4706
Patent
active
056996861
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a device for electromagnetically blocking the closing cylinder of a lock, comprising at least one movable tumbler engaging in a recess provided on the circumference of the closing cylinder.
BACKGROUND
In respect of closing cylinders, there have already become known electronic closing cylinders in which a movable tumbler is placed into a locking position or is disengaged from such locking position by an electromagnetic drive. In a particularly simple manner, an electromagnetic drive in that case may be designed as a lifting drive, such a design yet having the disadvantage of being relatively largely prone to failures. Whenever a movable tumbler is to be actuated by magnetic forces, sufficient movability of the movable tumbler is to be safeguarded and there is the risk of the locking position of such a movable tumbler being released under mechanical influences, for instance by striking at the cylinder, safety thus being no longer ensured.
SUMMARY OF THE INVENTION
The invention aims at providing a device of the initially defined kind, in which safe blocking may be effected by means of an extremely small electromagnetic drive and cannot be readily undone again even under the influence of shocks or other mechanical or electromagnetic actions on the locking cylinder. To solve this object, the device according to the invention essentially consists in that the movable tumbler cooperates with an electromagnetic rotary drive and in its closing position is secured against disengagement from the recess. By providing an electromagnetic rotary drive structurally similar to a conventional small-design motor and by using this rotary drive for preventing the movable tumbler from disengagement from its blocking position in a predetermined rotary position, a high degree of safety is ensured even at slight actuation forces. For, the actuation forces of the rotary drive merely need be adequate to place a support in its operating position, against which the movable tumbler can no longer be moved out. On the other hand, the actuation forces required for unblocking are limited to rotating the rotary drive in a manner that the movable tumbler may re-emerge from a recess into which is has been inserted in its closing position. Thus, the electromagnetic drive causes only the adjustment of a stop shoulder or supporting surface provided for the movable tumbler and, therefore, an extremely small-design and simple rotary drive applying only slight forces will do, but which nevertheless ensures a high degree of safety against mechanical influences. To enable unblocking and the disengagement of the movable tumbler, the configuration advantageously is devised such that the rotary drive enables the disengagement of the movable tumbler from the recess of the closing cylinder in a defined rotary position.
Particularly simple blocking and safe supporting of the movable tumbler may be realized in that the movable tumbler, about its circumference, comprises cantilevering projections or wings or the like and is resiliently pressed into the recess of the blocking cylinder, and that the end face of the rotary drive facing the movable tumbler in a defined rotary position of the rotary drive comprises recesses for receiving said projections or wings. Such a configuration allows for the use of a particularly compact rotary drive, said configuration advantageously being devised such that the rotary drive comprises a stator constituted by a coil spooled on the generated surface of a cylinder in the direction z, and a rotor magnetized in the direction x, in particular a tube- or sleeve-shaped rotor. The tube- or sleeve-shaped design of the rotor allows for the arrangement of a spring for resiliently pressing the movable tumbler and, furthermore, allows said movable tumbler to be pressed into the central cavity of the rotor unless the projections or wings are prevented from immersing into the rotor by an appropriate stop surface.
In order to make the movable tumbler readily evade upon release of the stroke o
REFERENCES:
patent: 3935720 (1976-02-01), Boving
patent: 3967846 (1976-07-01), Schlage
patent: 4625848 (1986-12-01), Meyers et al.
patent: 5010750 (1991-04-01), Boser et al.
patent: 5542274 (1996-08-01), Thordmark et al.
patent: 5561997 (1996-10-01), Milman
Krewenka Roland
Neumayer Harald
EVVA-Werk Spezialerzeugung von Zylinder- und Sicherheitsschlosse
Gall Lloyd A.
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