Electronic locks

Claim 2

A door control unit comprising: door locking means having a rotatable lock cylinder for locking and unlocking a door; engaging means engaging said lock cylinder for normally locking said door; means responsive to a control signal for disengaging said engaging means from said lock cylinder; a key having a first and second series of lightreflective discrete encoded bars formed thereon, said first series being laterally opposite to said second series; said key plug including photodiode means carried thereon for reflectively decoding said first and second series of decoded bars upon insertion of said key into said key plug thereby forming a first identification code; and processor means for comparing said first identification signal with at least one other predetermined identification code for generating said control signal when said first code corresponds to said other code thereby unlocking said door.

Claim 3

A door control unit according to claim 1, wherein said lock cylinder operating with a key plug adapted to be carried within and rotatable with said lock cylinder.

Claim 4

A door control unit according to claim 1 or claim 2, wherein said responsive means comprise solenoid means responsive to a control signal for disengaging said engaging means from said lock cylinder.

Claim 5

A unit according to claim 3, wherein said locking means include pin means for engaging said lock cylinder for normally locking said door and a spring biased lever movable from a first position in which it locks said door to a second' position in which said pin means are disengaged from said lock cylinder to unlock said door by said solenoid means.

Claim 6

A unit according to any one of the preceding claims, wherein said photodiode means include light-emitting diodes and a phototransistor means connected to said processor means for generating said first identification code on detecting light reflected by the key from said light emitting diodes.

Claim 7

A door control system for selectively controlling the locking and unlocking of a plurality of doors comprising: a plurality of door control units, each of said units including door locking means having a rotatable lock cylinder for locking and unlocking a door; engaging means engaging said lock cylinder for normally locking said door; means responsive to a control signal for disengaging said engaging means from said lock cylinder; a key having a first and second series of lightreflective discrete encoded bars formed thereon, said first series being laterally opposite to said second series; said key plug including photodiode means carried thereon for reflectively decoding said first and second series of decoded bars upon insertion of said key into said key plug thereby forming a first identification code;; processor means for comparing said first identification signal with at least one other predetermined identification code for generating said control signal when said first code corresponds to said other code thereby unlocking said door; and master control means for selectively generating said second predetermined identification codes for each of said processor means, and for selectively changing said second predetermined identification codes in each of said processor means.

Claim 8

A door control system for selectively controlling the locking and unlocking of a plurality of doors comprising: a plurality of door control units, each of said units including door locking means having a rotatable lock cylinder for locking and unlocking a door; engaging means engaging said lock cylinder for normally locking said door; means responsive to a control signal for disengaging said engaging means from said lock cylinder; a key having a first and second series of lightreflective discrete encoded bars formed thereon, said first series being laterally opposite to said second series; said key plug including photodiode means carried thereon for reflectively decoding said first and second series of decoded bars upon insertion of said key into said key plug thereby forming a first identification code;; processor means for comparing said first identification signal with at least one other predetermined identification code for generating said control signal when said first code corresponds to said other code thereby unlocking said door; and master control means for selectively generating said second predetermined identification codes for each of said processor means, and for selectively changing said second predetermined identification codes in each of said processor means.

Claim 9

A system according to claim 6 further including smoke detector means connected to said processor means for providing a second control signal representing the presence of smoke or fire whereby said processor means transmits a third control signal representing the presence of fire or smoke to said master control unit.

Claim 10

A system according to claim 6 or 7, wherein said processor means includes alarm means for indicating attempts at unauthorized opening of said door control unit.

Claim 11

A system according to claim 6, 7 or 8, wherein said master control means includes timing means for selectively permitting the opening of said doors by predetermined keys during predetermined times of the day.

Claim 13

A system according to claim 10, wherein said master control means includes second mode selector means for generating a second predetermined-number, different from said first number, of said identification codes.

Claim 14

A door control unit substantially as herein described with reference to and as shown in Figures 1 to 9, 15 and 16 of the accompanying drawings.

Claim 15

A door control unit substantially as herein described with reference to and as shown in Figures 1 to 9, 15 and 16 of the accompanying drawings.

Claim 16

1 3. A door control unit substantially as herein described with reference to and as shown in Figures 1 to 9, 1 5 and 16 as modified by Figures 10 and 11 of the accompanying drawings.

Claim 17

1 3. A door control unit substantially as herein described with reference to and as shown in Figures 1 to 9, 1 5 and 16 as modified by Figures 10 and 11 of the accompanying drawings.

Claim 18

A door control unit substantially as herein described with reference to and as shown in Figures 1 to 9, 1 5 and 16 as modified by Figures 12 to 14 of the accompanying drawings. 1 5. A door control system substantially as herein described with reference to and as shown in Figures 1 to 9, 15 and 16 of the accompanying drawings. 1 6. A door control system substantially asherein described with reference to and as shown in Figures 1 to 9, 15 and 16 as modified by Figures 10 and 11 of the accompanying drawings. 1 7. A door control system substantially as herein described with reference to and as shown in Figures 1 to 9, 15 and 16 as modified by Figures 12 to 14 of the accompanying drawings. 1 8. Any novel feature or combination features disclosed herein.

Claim 19

A door control unit substantially as herein described with reference to and as shown in Figures 1 to 9, 1 5 and 16 as modified by Figures 12 to 14 of the accompanying drawings. 1 5. A door control system substantially as herein described with reference to and as shown in Figures 1 to 9, 15 and 16 of the accompanying drawings. 1 6. A door control system substantially asherein described with reference to and as shown in Figures 1 to 9, 15 and 16 as modified by Figures 10 and 11 of the accompanying drawings. 1 7. A door control system substantially as herein described with reference to and as shown in Figures 1 to 9, 15 and 16 as modified by Figures 12 to 14 of the accompanying drawings. 1 8. Any novel feature or combination features disclosed herein.