Locks – Operating mechanism – Key
Patent
1997-09-18
1999-08-03
Barrett, Suzanne Dino
Locks
Operating mechanism
Key
70493, E05D 2700
Patent
active
059310367
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The invention relates to a rotating closing cylinder for a safety lock, having a stator and a rotor and a plurality of tumblers that respectively have a core pin and a housing pin.
2. Prior Art
Rotating closing cylinders of this type are well-known. To enable the rotor to rotate, the tumblers are aligned with a key that is inserted into the key conduit. The security of these rotating closing cylinders can be impeded by the following break-in method: A break-in tool is used to rotate the rotor about its axis of rotation with a certain torque and, at the same time, the tumblers are moved radially outwardly due to vibration until all of the housing pins are behind the shoulder of the rotor that has been formed by the rotation, and the rotor can be rotated further, even without a key. Thwarting this break-in method was heretofore very costly.
OBJECT OF THE INVENTION
It is the object of the invention to improve the break-in protection provided by a generic rotating closing cylinder. Nevertheless, the rotating closing cylinder is intended to be inexpensive to produce, and function reliably. Break-in protection is defined here as the degree of difficulty an intruder would face in attempting to align the tumblers without knowledge of the lock code, but without destroying the lock. The invention is particularly intended to improve the break-in protection provided against the above-described break-in method.
In a generic rotating closing cylinder, the object is accomplished in that at least one blocking element is seated in the rotor to be displaceable approximately transversely to a core pin of a tumbler, and to extend into a recess of the stator when in the non-operative position; that the recess of the stator has a control surface such that the blocking element is moved toward the core pin when the unblocked rotor is rotated; that a recess is cut into the circumference of the core pin such that, when the core pin is aligned after the rotor has been rotated by a comparatively small angle, the blocking element can be pushed into the recess of the stator until a it has been raised out of the recess; and that, when the core pin is not aligned, the blocking element basically cannot be displaced out of its non-operative position, and rests against the outside of the core pin.
SUMMARY OF THE INVENTION
In the rotating closing cylinder of the invention, the rotor can only be rotated if both the housing pins and the core pins are aligned. If one core pin is not aligned, the blocking element cooperating with it cannot be displaced out of the non-operative position into the unblocked position. If all of the core pins are aligned, the recesses of the core pins are aligned such that the blocking elements can be displaced and can extend into these recesses. An essential point is that the blocking elements extend into the recesses of the core pins only when the rotor has been rotated out by the comparatively angle that is typical for rotating.
Thus, the blocking elements cannot be used to align the core pins in the above-described break-in method. Only the housing pins can be aligned for use in the method, not the core pins. The core pins are permanently unaligned in the corresponding bores of the rotor; it is highly improbable that all of the core pins will happen to be simultaneously positioned such that all of the blocking elements could be displaced. A significant advantage of the invention is that the necessary changes to existing rotating closing cylinders are comparatively minor. Considerably higher security with respect to the described break-in method can be achieved at a relatively low cost.
According to a modification of the invention, production is particularly inexpensive if the blocking element is embodied as a pin seated in a bore of the rotor. A plurality of such blocking elements is preferably provided. Each blocking element is then associated with a core pin of a tumbler series. The blocking element can, however, be a slide that cooperates w
REFERENCES:
patent: 3455130 (1969-07-01), Basseches
patent: 3494158 (1970-02-01), Bauer et al.
patent: 4085601 (1978-04-01), Sauder
patent: 4222252 (1980-09-01), Tietz
patent: 4377940 (1983-03-01), Hucknall
patent: 4434636 (1984-03-01), Prunbauer
patent: 4712399 (1987-12-01), Mattossovich
patent: 5375444 (1994-12-01), Smith
patent: 5475998 (1995-12-01), Raskevicius et al.
patent: 5517840 (1996-05-01), Haggstrom
patent: 5640865 (1997-06-01), Widen
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