Spring-loaded retainer in a twist lock barrel for a safety lock

Locks – Operating mechanism – Using a powered device

Patent

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Details

70358, E05B 4700

Patent

active

059341190

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Technical Field of the Invention
The invention relates to a spring-loaded tumbler in a twistlock cylinder for a safety lock, with a rotor pin and a housing pin which are arranged in order, for the rotational release of the rotor, by means of an insertable key introduced into a keyway of the twistlock cylinder, and with a blocking member which follows the housing pin in the event of an attempt to unlock the lock.
2. Prior Art
A tumbler of this type became known from CH-A-669,633 of the Applicant. This possesses a blocking pin and compression spring in a bore of the plug pin. The compression spring presses with prestress onto the blocking pin which itself presses onto the housing pin bearing on the plug pin. When the housing pin is lifted off from the plug pin in the event of an attempt to unlock the lock, the blocking pin follows the housing pin essentially without delay and locks the rotor.
Increasingly more efficient instruments are available for unauthorized unlocking methods which primarily employ the Hubb procedure. There is therefore an urgent need for further tumblers which take into account the further development of such break-in tools.


OBJECT AND SUMMARY OF THE INVENTION

The object on which the invention is based is to provide a tumbler of the type mentioned, the unlocking security of which allows for the more stringent safety requirements. Unlocking security is used to mean the degree of difficulty in arranging the tumblers of a lock cylinder in order non-destructively, using aids, without a knowledge of the lock code.
In a conventional tumbler, the object is achieved in that the blocking member has a part which is preferably guided displaceably in the housing pin and which is connected magnetically to the rotor pin. During the authorized arrangement of the tumbler in order by means of an associated insertable key, the magnetic connection between the displaceably guided part and the rotor pin can be separated, essentially without any additional effort, when the rotor is rotated. By contrast, in the event of an unauthorized attempt to unlock the lock, the displaceably guided part always remains connected to the plug pin. The displaceably guided part therefore always follows the plug pin without delay.
According to a development of the invention, the part guided displaceably is a pin which is mounted in a longitudinal bore of the housing pin. The pin is preferably a steel bolt which is mounted in the housing pin so as to be freely displaceable and which blocks in the event of an attempt to unlock the lock and would have to be sheared off. According to a development of the invention, the rotor pin has a spring element which is supported indirectly or directly on the housing pin and which loads the rotor pin radially inwards. This spring element permanently presses the rotor pin radially inwards. In the event of an attempt to unlock the lock, during which the housing pin is moved radially outwards, the radially guided part of the blocking member is always held, by being fixed magnetically, in a position in which this displaceably guided part oversteps the shearing line of the rotor and consequently blocks it. It would therefore be possible to release the rotor only when the housing pin and, at the same time, the rotor pin are arranged in order.
A particularly strong magnetic connection can be made when the blocking member has a permanent magnet made from an alloy which contains metals from the lanthanide group. It is consequently possible to exert a high force of adhesion even with a very small magnetic part. The permanently magnetic part may therefore be produced as a pin with a diameter of, for example, 0.5 mm.


BRIEF DESCRIPTION OF THE DRAWINGS

An exemplary embodiment of the invention is explained in more detail below with reference to the drawing in which: FIG. 1 shows a section through part of a lock cylinder with a tumbler according to the invention, in the basic position, FIG. 2 shows a section according to FIG. 1, but with an insertable key introduced into

REFERENCES:
patent: 3494157 (1970-02-01), Coker, Jr.
patent: 3656328 (1972-04-01), Hughes
patent: 3869889 (1975-03-01), Prahl
patent: 4026134 (1977-05-01), Woolfson
patent: 4380162 (1983-04-01), Woolfson
patent: 4856309 (1989-08-01), Eizen
patent: 5074136 (1991-12-01), Kim et al.
patent: 5123268 (1992-06-01), Eizen
patent: 5437176 (1995-08-01), Keller
patent: 5457974 (1995-10-01), Keller

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