Locks – Operating mechanism – Using a powered device
Patent
1981-12-30
1985-04-02
Wolfe, Robert L.
Locks
Operating mechanism
Using a powered device
70278, 70413, E05B 4700
Patent
active
045079447
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a cylinder lock-key combination comprising a cylinder housing in which there is arranged a rotatable cylinder plug having a key slot and an electronic evaluating circuit for establishing proper actuation of the cylinder, whereat the key constitutes a carrier of coded information which can be read-off through a sensing means arranged in the cylinder housing and/or the cylinder plug and connected to the electronic circuit.
STATE OF THE ART
A comparatively complicated system of this kind is described in Swedish Patent Application No. 7902397-4 (Bauer Kaba), in which for the purpose of identifying the key, the part thereof which is inserted into the cylinder is provided with a magnetically passive and inductively readable information carrier. Thus, in this known system the key is arranged to generate induction currents when inserted into the lock cylinder, and the magnitude and/or sense of the induction currents is, or are, detected by a read-out head arranged in the lock cylinder and provided to this end with a read-out coil which is activated by means of an alternating current. According to a preferred embodiment the read-out head in the lock cylinder and the code information on the key are so constructed and arranged relative to one another that during relative movement between the key and the lock cylinder there are generated two timing signals representing the direction of movement and the speed of movement, and an identification information signal. German Open-to-public-print No. 23 25 566 (Zeiss Ikon) describes a similar system.
A system of this kind based on information signals generated by means of electric induction requires the provision of a large number of complicated components incorporating an evaluation current circuit in order to achieve the accuracy required. The induction currents generated when the key is slowly inserted into the lock are particularly weak, and to eliminate the potential risk of erroneous evaluation the components of the circuit in question must be constructed with particular precision. As a result hereof, the lock as a whole is also expensive and, moreover, is sensitive to different forms of actuation.
In the lock arrangement described and illustrated in the German Open-to-public-print No. 25 46 542 (Zeiss Ikon), the key is instead provided with magnetic information means, whereat the sensing or read-out means of the cylinder lock comprises a Hall generator which is actuated by the magnetic field generated by the code, the field lines of said magnetic field extending both parallel with and perpendicularly to the longitudinal axis of the key. In order to detect the information correctly there are required two Hall generators which form an angle of 90.degree. relative to one another. In addition to this relative complication, the system also has the disadvantage that the code can easily be made visible and readily changed, which in many cases is undesirable. Because of this, the system as a whole is not reliable enough.
Other lock-key combinations comprising a key having portions with variable magnetic permeability are described in Austrian Pat. No. 312 456 (Kibolac) and Swedish Pat. Nos. 403 160 (.ANG.berg) and 319 998 (Sperry Rand). In all these systems there is a static sensing of the magnetic flux which requires as many sensing means as coded portions on the key. This makes these known systems rather complicated and accordingly expensive.
In U.S. Pat. No. 3,949,345 (Makino et al.) there is described a multiple magnetoresistance element not intended to cooperate with a lock and/or a key.
OBJECTS OF INVENTION
One object of the present invention is to provide a cylinder lock-key combination of the aforementioned kind with which the disadvantages associated with previously known similar combinations are eliminated and which is of simple and robust design and will not permit undesirable manipulation or actuation, and which is sufficiently reliable even after having been used for a relatively long time.
SUMMARY OF
REFERENCES:
patent: 4287733 (1981-09-01), Gomez-Oleo
patent: 4331013 (1982-05-01), Jaulmes
patent: 4399673 (1983-08-01), Gotanda
patent: 4414831 (1983-11-01), Perkut
Rubensson Bjorn
Widen Bo
GKN-Stenman AB
Wolfe Robert L.
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