Locks – Operating mechanism – Key
Patent
1994-09-21
1996-08-06
Meyers, Steven N.
Locks
Operating mechanism
Key
70283, 70277, 70496, E05B 2700, E05B 4706
Patent
active
055422748
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cylinder lock comprising a cylinder plug which is mounted for rotation in a lock cylinder and which includes one or more lock elements, such as a row of pins or tumblers or a side-bar which are activated directly or indirectly by means of a key. The cylinder lock further includes a latching element which is mounted in the lock cylinder and which in an active position prevents turning of the plug and in a release position permits the plug to be turned, the latching element being urged by spring means towards its latching position and coacts with an electrically activated blocking element, wherein in one position the blocking element permits the latching element to move radially to its release position, and in another position blocks the latching element in its locking position.
In addition to their normal key-operated fuction, cylinder locks of this kind which also include an electrically-operated blocking function find use in many different areas. One such area is in controlling access to a locality or building in which a person in possession of a key to the lock is autorized access to the locality or building only at certain times of the day. The electric blocking function is able to prevent access automatically at predetermined times.
In other cases, the lock key is provided with an electric code in addition to the normal key code. In this case, the key may include a transmitter which transmits a signal which is captured by an antenna located in the vicinity of the lock. When the signal transmitted from the key is the correct signal fort that particular lock, the electric blocking function of the lock is deactivated, therewith enabling the key to be used in the normal manner. This enables various passage control systems to be constructed without needing to provide authorized and unauthorized persons with a number of different keys at different times.
Naturally, attempts are made to force system locks that are equipped with electric blocking functions of the kind meant here, and it is therefore advantageous when the electrically activated blocking devices are able to make forcing of such locks more difficult.
BACKGROUND OF THE INVENTION
Various types of electrically actuable cylinder plug blocking devices are known to the art.
For instance, U.S. application Ser. No. 3,241,344 (Peters) discloses a key-activated cylinder lock which is intended to secure a deck lid, for instance, and which can also be activated electrically. This lock arrangement includes two mutually independent actuable locking devices which coact in a locked state but which can be actuated selectively and alternatively to open the lock. To this end, there is used a blocking element which is activated by an electromagnet or solenoid and which also coacts with a key-activated side-bar. The blocking element has a pointed end and engages with an obliquely positioned hook in the cylinder plug periphery, in the region of the side-bar. The cylinder lock can be opened by turning the key, whereupon the side-bar is withdrawn and the pointed end of the blocking element is displaced radially inwards while engaging the hook as the cylinder plug is turned against the action of a spring. The lock can also be opened by energizing the electromagnet, whereupon the blocking element shaft, which forms the electromagnet armature, is drawn into the coil so that the plug can be freely rotated.
CH-A-653,400 (Bauer Kaba) discloses a cylinder lock which includes an electromagnetically activated and axially movable side-bar which is mounted in a slot or recess in the end of the cylinder plug located outside the lock housing. When the side-bar is located in an axial position, the plug can be rotated by means of the key, whereas in another axial position the side-bar is accommodated in a recess which prevents the plug from being turned. EP-O 278,906 (Berchtold) discloses an electromagnetic cylinder lock provided with a key which is coded both electronically and mechanically. Electronic elements in the form of a m
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patent: 3287944 (1966-11-01), Crumb
patent: 4393673 (1983-07-01), Widen
patent: 4798068 (1989-01-01), Nakauchi
patent: 4848115 (1989-07-01), Clarkson et al.
patent: 4916927 (1990-04-01), O'Connell et al.
patent: 5351042 (1994-09-01), Aston
Thordmark Bo M.
Wallden Lars
Assa AB
Meyers Steven N.
Pham Tuyet-Phuong
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