Locks – Operating mechanism – Using a powered device
Patent
1991-12-27
1992-09-22
Gall, Lloyd A.
Locks
Operating mechanism
Using a powered device
292201, E05B 4700
Patent
active
051486911
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electrically and mechanically activatable lock mechanism, particularly, but not exclusively, a so-called narrow profile lock and more specifically to a lock mechanism of the kind set forth in the preamble of claim 1.
Such locks are used in many different connections, although are preferably used together with so-called profiled doors with which the space available for the lock housing is normally small.
Furthermore, high demands are placed on the security aspect of the lock mechanism and on its functional utility. The lock mechanism is normally activated electrically and consequently the electrical and mechanical components of the lock mechanism must be functionally reliable.
If a fault occurs in the electrical system, it is important that the lock can be manipulated mechanically with the aid of a key, i.e. independently of the electrical system and in the position occupied by the lock bolt or plunger when the fault occured.
BACKGROUND ART
A known electrically and mechanically actuable lock mechanism is described and illustrated in SE,B,445 055 (Beudat). One characteristic feature of this lock mechanism, however, is that the electrically actuable lock unit is latched against displacement in a given position, which means that when a fault occurs in the electrical system, the lock cannot be opened with the air of a key, unless physically tampering with the actual lock mechanism, which can be a relatively complicated process.
Further examples of lock mechanism forming part of the present standpoint of techniques are found described and illustrated in SE,E,8602601-0, DE,B,3 412 136, SE,B,453 107, U.S. Pat. No. 4,438,962, U.S. Pat. No. 4,685,709 and U.S. Pat. No. 4,126,341.
None of these known lock mechanism are concerned with a simple narrow-profile lock which comprises essentially standard components and which circumvents the aforesaid drawback.
OBJECTS OF THE INVENTION
Accordingly, an object of the present invention is to provide a lock of the aforesaid kind which can be manipulated both electrically and mechanically quite independently of one manipulating mode to the other and which can be manipulated mechanically with the aid of a key irrespective of the position in which the lock bolt or plunger is found in the event of a fault in the electrical system.
Another object is to provide a lock mechanism having the aforesaid advantageous function and being of simple and robust design and comprising essentially standard components and fulfilling the requirements demanded of a so-called narrow profile lock when only a small space is available for housing said lock.
SUMMARY OF THE INVENTION
These and other objects are fulfilled with a lock mechanism of the aforesaid kind which has the characteristic features set forth in the characterizing clause of the following claim 1.
The combination of a cylinder follower provided with centrally disposed sector-shaped slots and mounted on the same shaft as the adjacent dogging or transmission element, which is provided with dogs or projections which engage in said slots, the dogging element is able to activate the cylinder follower, subsequent to a start impulse to the drive motor, so that the lock bolt or plunger will swing from its free position to its locking position or vice versa. Furthermore, since the arrangement is such that the motor, subsequent to rotating to its terminal position, receives an impulse which causes the motor to return immediately to its starting position, the dogging element will accompany said movement while the cylinder follower will remain in the position adopted.
Thus, the transmission or dogging element will always adopt a neutral position (except when it moves to or from its second terminal position, which takes place in a sequence) in which the lock mechanism can be manipulated mechanically with the aid of a key.
Mechanical manipulation of the lock with the aid of a key is thus always possible, irrespective of whether or not a fault occurs in the electrical system and irrespe
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Assa AB
Gall Lloyd A.
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