Locks – Operating mechanism – Key
Patent
1989-09-20
1990-05-08
Wolfe, Robert L.
Locks
Operating mechanism
Key
70432, 70474, E05B 3508
Patent
active
049227378
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a lock arrangement of the kind which, expressed in general terms, includes a key-operated cylinder lock, which is mounted on one side of a lock housing, and a knob mechanism, which is mounted on the other side of the lock housing and by means of which a lock actuating member, such as a cylinder follower, can be manipulated through the intermediary of a dogging element.
Many different lock arrangements of this general kind are known to the art.
The invention relates particularly, but not exclusively, to locks of this kind which are intended preferably for use in hotels and like establishments, in which, in many instances, it is desirous to be able to manipulate the lock from outside the door to which the lock is fitted, with the aid of a standard pass key or guest key, and to be able to manipulate the lock from inside the door with the aid of the knob mechanism. It is also often required of such locks that when the door is locked from the inside by means of the knob mechanism, the door cannot be unlocked from the outside with the pass key or guest key. It is desirous, on the other hand, that such locks can be opened at all times with the aid of a special or so-called management key, even when the door has been locked from the inside by means of the knob mechanism.
The actual locking function of such locks will sometimes differ, although not significantly, depending upon the country from which the lock arrangement originates.
For example, the lock may sometimes include a handle-operated latch bolt and a dead bolt which is manipulated by the cylinder lock and the dead bolt mechanism.
In some cases no separate dead bolt is included in the lock, and instead the latch or catch bolt serves to lock the door automatically as the door is closed. Locks are also known with which the lock mechanism is manipulated with the aid of a key from the outside or from the inside with the aid of the knob or by further rotation of the handle.
Other types of locks having further modified locking functions are also known to the art.
Certain types of locks also include indicator means, e.g. a pin, which will indicate from outside the door whether or not the door is locked, i.e. whether the door has been locked from the outside with a key or from the inside by means of the knob.
BACKGROUND PRIOR ART
Examples of known locks of the aforesaid kind are described and illustrated in CH-A-650 054 (Berchtold), US-A-4 068 510 (Nearyl), US-A-1 639 535 (Russo), US-A-1 116 929 (Schoell) and FR-A-2 177 148 (Vachette).
None of these known lock arrangements or mechanisms, however, are constructed to prevent, with simple means, the lock from being opened with a standard key or guest key from the outside when the lock has been secured from the inside with the aid of a knob mechanism, while at the same time enabling the lock to be released from the outside with a special or management key.
OBJECT OF THE INVENTION
A prime object of the invention is to provide a simple lock arranement which will remove the aforesaid deficiency of known locks of this kind and which can be adapted readily to the many different types of lock systems and lock arrangements available on the market and where the type of lock system used is often related to that particular country or that particular part of the world in which the lock is used and to the lock traditions or "security philosophies" which prevail in the country concerned.
Another object is to provide a lock arrangement of the aforesaid kind with which a standard key can be converted, with the aid of simple means, to a special key or management key, and which is not encumbered with those drawbacks encountered with conventional master key systems, where possession of such a key by an unauthorized person would enable such a person to open all locks belonging to the system.
SUMMARY OF THE INVENTION
These and other objects are fulfilled by a lock arrangement according to the invention, which is characterized essentially in that the cylinder-lock dogging eleme
REFERENCES:
patent: 1116929 (1914-11-01), Schell
patent: 1639535 (1927-08-01), Russo
patent: 2188149 (1940-01-01), Kaiser
patent: 3916656 (1975-11-01), Schlage
patent: 4047408 (1977-09-01), Johns
patent: 4068510 (1978-01-01), Neary
patent: 4437695 (1984-03-01), Foshece
patent: 4793166 (1988-12-01), Marks
Assa AB
Wolfe Robert L.
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