Conventional mechanical lock cylinders and keys with electronic

Details Conventional mechanical lock cylinders and keys with electronic Conventional mechanical lock cylinders and keys with electronic

1992-02-14

1994-11-22

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

235382, 235492, G06K 978, G06K 962

Patent

active

053672950

ABSTRACT:
A mechanical key and lock cylinder with mechanical bittings include an electronic access control feature, with minimal modification and without affecting or interfering with the mechanical function of the key and cylinder. A small, low-profile memory cell is embedded in a recess or lateral hole through the key, with one cell terminal grounded to the key and the other having a contact extension. When the key is inserted into the keyway of the cylinder plug, the ground connection is made with the cylinder and the memory cell contact extension engages a spring-loaded contact of a connector unit which extends from the cylinder plug. An insulated wire carries the conductive path out of the lock cylinder. The key remains of very low profile, and the cylinder plug is modified only by a small longitudinal bore from front to rear. Existing mechanical locks and cylinders can easily be retrofitted with the electronic access control feature.

REFERENCES:
patent: 4686358 (1987-08-01), Seckinger et al.
patent: 4835407 (1989-05-01), Kataoka et al.
patent: 4858453 (1989-08-01), Namazue
patent: 4922736 (1990-05-01), Tanaka et al.
patent: 4947662 (1990-08-01), Imedio
patent: 4998952 (1991-03-01), Hyatt, Jr. et al.
patent: 5003801 (1991-04-01), Stinar et al.
patent: 5019812 (1991-05-01), Gostahagberg et al.
patent: 5131038 (1992-07-01), Puhl et al.
patent: 5140317 (1992-08-01), Hyatt, Jr. et al.

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