Locks – Special application – For control and machine elements
Patent
1997-11-07
2000-04-25
Boucher, Darnell M.
Locks
Special application
For control and machine elements
109 44, 70197, 70215, 70224, E05B 1310
Patent
active
060530189
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention is directed to a swivel lever lock for the door leaf of a switch cabinet, the flap of a housing, the wall panel of a housing frame, this swivel lever lock comprising a security device.
PRIOR ART
In a security device for a switch cabinet door used within the Applicant's own enterprise and already known to the Applicant, a rotating lock can be brought into a position independent from the actual door lock such that the door is prevented from opening. This locking position of the additional rotating lock can be fixed electronically by means of an additional security device, so that unlocking is possible only under certain circumstances, for example, when no voltage is present within the interior of the cabinet.
Also known to the Applicant and used within the Applicant's own enterprise is another version provided only for small doors in which a lever-shaped lock is capable of locking the door in the closed position by its lever arm, while the oppositely located arm is held in the locking position by an electrical device when voltage is present inside the cabinet.
Apart from these embodiment forms which are known only to the Applicant, a security switch is known in general from a catalog by the company K.A. Schmersal GmbH & Co. KG, Wuppertal, page 33, which security switch is used on protective gratings, hoods and doors which must be closed to achieve the required operating security. When the protective device is closed by sliding the actuating key into one of the slots formed by the security switch, safety contacts are closed. When the protective device is opened, the safety contact is opened in a compulsory manner mechanically by pulling out the actuating key and the make-contact is closed. A disadvantage in this prior art consists in that this security switch must be provided in addition to the lock devices for, e.g., the door, which renders the arrangement more complicated.
It is the object of the invention to provide a security device of the type mentioned above in such a way that fewer, preferably no more than two, different elements are required for door locking and for security.
A further object consists in so developing the security device that additional lock arrangements can be provided which can only be opened by authorized persons.
Further, the security device is so designed that there is no risk of unintentionally tearing out the lock and thereby possibly opening it which would result in endangerment of a user who possibly unintentionally opens the door lock and can thus gain access to a switch cabinet in which voltage is still present.
In particular, an individual lock is sufficient for the door lock and for security, whereas previously the security and locking of the door, flap, wall housing or the like were effected independently from one another.
Moreover, the securable lock can have a robust construction such that even large doors are securely held closed. Further, the arrangement is carried out in such a way that the actual forces for holding the door closed are not exerted by the security device, but rather by the lock device.
The set of objectives mentioned above is met by the features of the claims.
Moreover, the securable lock can have a robust construction such that even large doors are securely held closed. Further, the arrangement is carried out in such a way that the actual forces for holding the door closed are not exerted by the security device, but rather by the lock device.
The set of objectives mentioned above is met by the features of claim 1.
In this way, it is possible to lock the door and to achieve the securing function that is additionally required in given applications by means of only one lock element.
The security device does not impede the movement of the door itself, so that there is no risk of unintentionally tearing out or damaging the security device when attempting to open the door; moreover, the locking and security device are now united in one construction according to the invention, which simplifies assembly and also provides a
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patent: 4717794 (1988-01-01), Paul et al.
patent: 4930325 (1990-06-01), Ramsauer
patent: 5457971 (1995-10-01), Yamada
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