Locks – Operating mechanism – Using a powered device
Patent
1992-07-16
1994-08-23
Gall, Lloyd A.
Locks
Operating mechanism
Using a powered device
70387, 70408, 70413, 70432, E05B 4700
Patent
active
053396618
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a magnetic card lock with key card in accordance with the preamble to the main claim.
Magnetic card locks with key cards have been known for a long time. Thus, Federal Republic of Germany OS 37 02 730 discloses a magnetic card lock having permanent magnets which are arranged in the key card and the position and polarization of which form the key code. The basic construction of a magnetic card lock can be noted from European Patent Application 242 142, the lock having an insertion slot for a key card which is developed as a magnetic card. The lock has a displaceable slide into which the magnetic card can be inserted up to a first stop position. If the coding of the magnetic key card is correct, this slide can be displaced along an actuation path up into a second stop position by pushing the magnetic card further into the lock housing. This displacement effects the release of the closing device. In the first stop position, the inquiry position, magnetic tumbler pins of the inner mechanism are moved by interaction with the permanent magnets of the key card which are associated with them. A key card bearing the correct key code can then be moved up into a second stop position, the position of release.
In order to avoid erroneous switchings and provide assurance as to whether a correctly coded key or an incorrectly coded key has been inserted, it is therefore desirable to obtain from the lock information as to which closure position it is in.
SUMMARY OF THE INVENTION
The object of the invention is therefore so to develop a key card of this type that a visible indication of the position of the closure mechanism is provided by simple means.
As a result of such a magnetic card lock with key card according to the invention, the position of the closure mechanism can be noted at any time. If the key card is first pushed into the magnetic card lock up into the first stop position, the inquiry position, then, alongside the first partial surface, also the second partial surface is visible, it for instance being of a color different from the first partial surface in order to distinguish it visually from the latter. The position of the closing device (inquiry position) can immediately be noted by the visibility of the second partial surface. A user can note even from afar that the closure device is not released. In order to obtain the release of the lock, it is rather necessary to insert the key card into the lock by an actuation distance up to the second stop position (release position). If the key card bears the correct coding, the second partial surface is then no longer visible. An incorrectly coded key card can be immediately recognized in the case of a magnetic card lock of this type without actuation of the lock having to be effected, since the second partial surface, which forms an insertion-marking strip, does not disappear. In accordance with another advantageous development, the first partial surface is continued in the direction of insertion by a tapered section. In this way, the user obtains information as to the correct direction of insertion of the key card. The tip of the first partial surface lies approximately on that transverse line of the key card which corresponds upon the pulling out of the key card at the time of the elimination of the release position. In this way, a visible indication is given of the distance by which the card must be pulled out until the actuatability of the lock is eliminated, this distance being greater than the actuation distance. Another development of the key card provides developing the second partial surface as a strip the width of which corresponds to the actuation distance and of providing, on the other side of said strip, a third optically differentiated partial surface which approximately fills the entire surface of the gripping opening upon reaching the key removal position which leads to the cancelling of the release. In this way also the elimination of the release of the lock is optically ind
REFERENCES:
patent: 1077120 (1913-10-01), Boldizs
patent: 3271983 (1966-09-01), Schlage
patent: 3588397 (1971-06-01), Ellefson
patent: 3834197 (1974-09-01), Sedley
patent: 3995460 (1976-12-01), Sedley
IBM Technical Disclosure Bulletin, vol. 9, No. 3, Aug. 1966, p. 314.
Farber Martin A.
Gall Lloyd A.
Schulte-Schlagbaum Aktiengesellschaft
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