Locks – Operating mechanism – Using a powered device
Patent
1981-04-15
1983-11-15
Wolfe, Robert L.
Locks
Operating mechanism
Using a powered device
70278, 70413, E05B 4700, E05B 4900
Patent
active
044148313
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a key-operated lock, comprising a reading head with a Hall generator, the magnetic inductance of said Hall generator varying in dependence upon the position of the key provided along its axis with successively arranged magnetically readable data locations, wherein the signal voltage of said key, which depends upon the momentary value of the inductance, is being compared by a receiving circuit with stored data as set, the receiver circuit, in case of matching data, actuating the mechanical latching arrangement of the lock.
A lock of this type is known from DE-OS No. 25 46 542. This lock as known will however, when operating with a Hall generator, allow only a very limited degree of encodability, since the Hall generator can only determine how many individually separated magnetic zones are present on the key body. The determined number of magnetic data is then, after conversion into a corresponding number of electrical pulses, compared in the receiving circuit with a stored number that represents the data as set. The key of the known lock may be provided with an additional timing-pulse track in order to control the moments of sensing during which the Hall generator carries over the data formed by the magnetic zones and supplies these to the receiving circuit. Such a timing-pulse track will, however, increase the expenditure for lock and key, irrespective of read-out being made mechanically, magnetically or electro-optically.
The invention is based upon the task of making available a key-operated lock of the aforenoted category, which will allow a high degree of encodability, i.e. a great number of different combinations, whilst requiring only low expenditure for production of the key, and a small quantity of electronic components for the lock.
As per invention, this task is solved by each magnetically readable data location on the key forming, at minimum, a bivalent (dual) code, and by each data location being succeeded by a magnetically readable timing-pulse plane controlling the processing in the receiving circuit of the data location previously read out by the Hall generator in the reading head.
It will be possible in this manner to obtain with a key body of equal length a manifold increase in the degree of encodability when composed to the known lock and key, this increase resulting on one hand by each data location being able to assume two values (code numbers), i.e. the logical zero and the logical one, but in case of need also two or more values (code numbers), whilst on the other hand the length occupied on the key body by each data location may be kept particularly small due to the presence of the timing-pulse planes, without however, requiring a separate timing-pulse track with its aforenoted disadvantages.
The subordinate claims contain advantageous embodiments of the lock and key as per invention.
The invention is explained below with the aid of the drawing containing the embodiments selected as examples, partially in schematic simplification, and also explanatory diagrams and circuit diagrams. Shown in:
FIG. 1: a first embodiment of the reading head within the lock as well as the appurtenant key body, in a schematic simplification,
FIGS. 2 to 6: the position of the coded segments within the reading head as per FIG. 1, at various positions of the key body,
FIG. 7: the circuitry for generating the signal voltage of the Hall generator,
FIG. 8: a diagram for the signal voltage in dependence upon inductance by the Hall generator,
FIG. 9: a circuit for obtaining logical voltage levels from the signal circuitry,
FIGS. 10a to 10c: diagrams of voltage levels in dependence upon the signal voltage,
FIG. 11: a circuit for comparing actual values of the voltage levels with the stored predetermined values,
FIG. 12: diagrams of, respectively, signal or voltage levels occurring in circuitry as per FIGS. 7, 9 and 11,
FIG. 13: a further embodiment of the reading head with appurtenant key,
FIGS. 14a to 14b: top views onto the reading head as per FIG. 13 at various positions of the coded se
REFERENCES:
patent: 3896292 (1975-07-01), May
Striker Michael J.
Wolfe Robert L.
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