Electronic door lock

Details Electronic door lock Electronic door lock

1987-02-26

1989-05-23

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

70279, 70413, E05B 4700

Patent

active

048334650

ABSTRACT:
The electronic door lock for an electronic key provided with an electronic store for a key word datum has a latch bolt (5) actuatable at least from the inside of the door by means of a handle and a bolt (7) which is lockable and unlockable by an electric drive device (35). A control circuit (81) formed especially as micro-processor reads the key word datum stored in the key, through the reading device (77), and controls the electric drive (35) in dependence thereon. The reading device (77) includes sensor elements (93, 95), especially pieco-electric elements by way of which the drive direction of the electric drive (35) is selectable by a key movement of short stroke. In order that the electronic lock may be opened manually in case of emergency, a mechanical lock cylinder (113) is provided by means of which the bolt (7) is uncoupled from the drive connection to the electric drive (35) and is bringable into a drive connection to the handle nut (23) actuating the latch bolt (5 ). Then by actuation of the door handle, in addition to the latch bolt (5) the bolt (7) can be unlocked. The data transmission between the reading device (77) and the electronic key takes place contactlessly by infra-red, like the working voltage supply of the key. The working voltage supply can however also take place through electric contacts.

REFERENCES:
patent: 4196347 (1980-04-01), Hadley
patent: 4392134 (1983-07-01), Lutz
patent: 4663952 (1987-05-01), Gelhard

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