|Publication number||US3854120 A|
|Publication date||Dec 10, 1974|
|Filing date||Apr 30, 1973|
|Priority date||Apr 30, 1973|
|Publication number||US 3854120 A, US 3854120A, US-A-3854120, US3854120 A, US3854120A|
|Inventors||Matto V, Veres S|
|Original Assignee||Matto V, Veres S|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (2), Referenced by (7), Classifications (11)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United- States Patent 1191 Matto et al.
1451 Dec. 10,1974
[ ELECTROMECHANICAL PROGRAMMABLE LOCK  Inventors: Victor G. Matto, Highlands Dr.,
- Kinnelon, NJ. 07405; Sandor A.
Veres, 247 Washington Ave., Rutherford, NJ. 07070 22 Filed: Apr. 30, 1973 21 Appl. No.: 355,583
 US. Cl. 340/164 R, 70/278, 200/42,
317/134  Int. Cl. E05b 49/00, H0lh 27/00  Field of Search 340/147 MD, 164 R, 164 A, 340/149 R, 274; 200/42, 44, 45; 317/134; 70 273 Primary Examiner-Donald J. Yusko Attorney, Agent, or Firm-Robert A. Green  ABSTRACT The programmable lock includes a portion made up of a plurality of programmable key sections and a lock portion made up of a plurality of programmable lock sections. Each lock section mates with and coacts with a corresponding key section. Each key section carries a plurality of key contacts and a fixed power supply contact, and the mating lock section includes a lock contact for each key contact and power contact for the fixed power supply contact of the key section. A rotatable cylinder surrounds the lock and includes two ring electrodes, one for contacting a selected lock contact, and the other shaped to contact all of the other contacts. The key section includes means for selecting one of the key contacts which corresponds to the one lock contact selected by the one ring electrode, and this represents a match for the lock and key sections.
Each of the lock and key sections can be differently coded, and they can be arranged electrically so that, when the key(s) properly match the lock(s), a useful output is obtained, and, if they do not match, an alarm signal may be obtained.
A programmable lock can include any number of sections made up of the parts described above to provide a unitary lock having a large number of possible combinations.
14 Claims, 17 Drawing Figures PAIENm-m 1 man sum ear 9 WWW 1 01914 sum a 0F 9 PATENTELJEBWIW 3.854.120
SHEET 8 0F 9 Door Relay k520A [530A E" I 3 OD I 330 I g1 8 Section 1 -21O 208 120C 120D 120K --390 i530B r5208 O O 6%3SOC Sect ion 2 Section 1 a Section 2 SREEI 70$ 9 M f52OE a a 120K ta 120A PATENTH, EEC i [H974 Fig. i2
I w o UtpUt 3%OK Sect Ion N 120K Input 540 Fig.8
is No Section 1 ate Section 2 Section 3 Section N 66 ti e PATENTEL 0 i914 3.854.120
SHEEF 8 0F 9 F ig. 14 [520A I 5 d Section 1 Input w 12oc v 5308 QNO 5 65 9 5 Section 2 53oc i i ONO 6 d Section 3 /52ON fig NO Section N 1 ZOA 570 Door Reiciy 660 Rin s 325% Alarm Fig.15
PATENTE SE81 01914 SHEET 9 0F 9 TRUTH TABLE nnu QOOOOOOOOOOOOOOO SOOOOOOOOOOOOOOO 40 0 0000000 OOOOOO 2O OOOOO 000 000000 DOOOOOO 1 COOOO 111OOOO1 1 BOO OO11OO OO1 110111010 NORMAL STATE 101011110 E OF E- 110111010 ALARMS Fig. -17
ELECTROMECHANICAL PROGRAMMABLE LOCK BACKGROUND OF THE INVENTION In the prior art, combination locks are known which require a particular key or combination of movements of a dial to be operated. However, either such locks cannot be easily set to a different combination, or they are limited in the number of combinations possible. In addition, the prior art does notinclude locks which are easily programmed and reprogrammed and can provide control electrical output signals.
SUMMARY OF THE INVENTION DESCRIPTION OF THE DRAWINGS:
FIG. 1 is a perspective exploded view of the lock of the invention;
F IG. 2 is a perspective exploded view of the key portion of the lock of FIG. 1;
FIG. 3 is a side elevational view of the key portion of FIG. 2 shown assembled;
FIG. 4 is a side view of the key section of FIG. 2 showing some of the parts assembled;
FIG. 5 is a persp'ective exploded view of the lock sectionof the lock of FIG. 1;
FIG. 6 is a side elevational view showing portions of two lock sections coupled together; I
FIG. 7 is a side elevational view ofa portion of a lock section with some of its parts assembled;
FIG. 8 is a side elevational view of a lock section showing some of its parts assembled;
FIG. 9 is a schematic representation of a lock section and a key section as they appear assembled and in operative relation;
FIG. 10 is a schematic representation ofa plurality of lock and key sections when assembled and one circuit connection arrangement in which they can be used;
FIGS. 11 to 14 are schematic representations of a complete lock unit and various circuit connection arrangements that can be made therewith;
FIG. 15 is a schematic circuit showing one mode of operation of the lock unit of the invention; and
FIG. 16 is a schematic representation of another-ch cuit for using the lock unit of the invention;
FIG. 17 is a truth table for the FIG. 16 operation.
DESCRIPTION OF THE PREFERRED EMBODIMENTS A programmable lock 10 (FIG. 1) embodying the invention comprises a lock portion 14 made up of a plurality of lock sections 300 and a key portion 16 made up of a plurality of key sections 20 coupled together and operable as a programmable lock unit having a large number of possible combinations, depending on the number of lock and key sections provided, as will be clear to those skilled in the art.
A single key section 20 is shown exploded in FIG. 2
'and includes matching and mating right and left insulator rings 30 and 30', each having a flat outer surface 40, 40' and an inner surface 50, in which are formed ten generally cylindrical spaced-slots 60, having conical bases 70, (FIGS. 2 and 3). Each slot 60, 60 is separated by a wall portion or web 80, Each insulating ring also includes an enlarged projecting tab 90, which includes a channel 100, in which is formed acontact receiving form or pedestal 110, A metal key contact is seated in each of the slots 60, and each contact is preferably cylindrical to match the cylindrical slots 60, 60, and each contact 120 has a generally conical end 122 which rests in a mating conical depression 70, 70' at the base of each slot 60, 60' (FIG. 3). Thus, when the two insulator sections 30, 30' are put together to form a key section (FIG. 3), the contacts 120 are held securely in place in the cylindrical slots 60, 60, with their ends in the conical depressions 70, 70' at the bases of the slots. A power input contact 130, which is formed of a metallic strip suitably bent and shaped into a generally U- shaped section, is seated on the forms 110, 110' in the tab portions 90, 90. The contact has curved end surfaces which project out of the front and rear ends of the slots 100, 100 so that contact can be made thereto in a manner to be described.
The insulator rings 30, 30' have generally circular central openings 140, (FIG. 2) in which is seated an insulating disc 150, called a program cam, having a bore l60 of hexagon shape or the like and having an outer surface which is generally smoothly curved except for a step portion formed therein. A metallic program ring is threaded on the program cam 150, and includes an arm 200 which engages the step 180 in cam 150 and a pair of tabs 210, 220 which protrude from its outer surface and can engage one of the key contacts 120 or power input contact 130 (FIG. 4). When'tabs or arms 210, 220 contact one of the key contacts 120, then the body of ring 190 contacts terminal 130 (FIGS. 4 and 8). The tabs 210, 220 are of different lengths to prevent their jamming during programming of each key section which is accomplished by rotating cam 150 and ring 190 to place tabs 210, 220 in contact with a selected contact 120 or contact *130. The parts ofthe key section are held together by means of rivets 230 or the like which extend through the insulating rings 30, 30' (FIG. 3).
The key portion 16 is made up of a plurality of sections 20 of the type described above, all mounted on a rod 240 (FIG. 1) which includes a shaft 250 of hexagonal cross-section shape to receive the program cams 150, having hexagonal bores. The mounting rod also has, at one end, a numbered ring portion 260 and a finger-gripping portion 270 to permit rotation of the shaft. The opposite end 280 of the shaft 250 is threaded to receive a lock nut 290 to lock the key sections 20 in place thereon.
Each lock section 300 (FIG. 5) includes an insulating ring member 310 having a base portion 314 which includes oppositely disposed apertured mounting tabs 340. An annular pedestal 360 rises from the front surface 350 of base member 310. The rear surface 320 of base 310 is provided with an annular depression 330 (FIG. 6) for receiving a metal contact ring 333 having a terminal 335, and the front surface of base 310 is provided with an annular depression 363 for receiving a metal contact ring 376 having a terminal 378. The annular pedestal 360 has ten spaced portionsof reduced thickness 370, each of which is adapted to receive and hold a generally U-shaped metal lock contact 380. A similar U-shaped metal contact 390 having a projecting terminal portion 400 is mounted on its portion 370 in the pedestal 360, with terminal 400 seated in a depression 403 in base 314 so that it is beneath, spaced from and insulated from metal ring 376. An insulating pad 410 is disposed on terminal 400, and it rests between terminal 400 and ring 376 (FIG. 7).
'Depressions 330 and 363 in the base 314 for metal rings 333 and 376 are not required, and other arrangements may be provided for seating these rings and relating them to contact 390.
Referring to FIG. 5, an insulating program ring 420, provided surrounding the pedestal 360, includes ten selector numerals on its outer surface and annular depressions 430 and 440 in its inner surface adjacent to its outer opposite surfaces. One depression 430 receives a split metal contact ring 450, and the other depression 440 receives a split metal contact ring 460 having an inwardly projecting arm 470. The split contact ring 450 and contact ring 370 are of such dimension and shape that, when the program ring 420 is in place on the pedestal 310, as illustrated in FIG. 6, the split contact ring 450 makes electrical contact with the ring 370. Similarly, the second contact ring 460 and ring 333 are of such size and dimension that, when two insulator lock rings 310 are placed side by side in a lock assembly, ring 460 makes contact with the ring 333 on the rear surface 320 of the adjacent insulator ring member 310. In addition, arm 470 of split ring 460 makes contact with one lock contact 380 (FIG. 8), and split ring 450 makes contact with all of the other lock contacts 380.
The lock portion 14 of programmable lock includes a plurality of lock sections 300 equal in number to the number of key sections in the key portion 16. The lock sections are held together by means of suitable fasteners 343 inserted in the aligned apertured tabs 340 in each lock section.
A lock 10 includes a plurality of key sections and a plurality of lock sections. As noted, for convenience, the lock 10 has a decimal numberal base, and there are ten key contacts 120 and ten lock contacts 380 in each key and lock section. Accordingly, each program ring 420 carries numerals l to 10 on its outer surface, and in each section, rings 430 and 440 are so positioned that the numerals l to 10 are properly aligned with the similarly designated lock and key contacts. This permits the lock and key sections to be programmed as desired.
The lock 10 is used as follows. First, each lock section is set by rotating each program ring 420 to bring it into a desired setting in which tab 470 of ring 460 is brought into contact with a selected lock contact-380 and to place ring 450 in contact with all of the other lock contacts 380. This provides a desired lock setting for each lock section. Now, each key portion 20 is set so that it will operate with the corresponding lock portion when the key is inserted in the lock. This is done by rotating each core 150 so that tabs 210 and 220 of each ring 190 contact a selected key contact 120 which corresponds to the selected lock contact 380 of the associated lock section. Thus, if lock section 1" has ring 470 in contact with the first lock contact 320, then the key section 1 has tabs 210 and 220 of ring 190 in contact with the first key contact 120. Similarly, if lock section 2 has ring 470 in contact with the third lock contact 320, then the key section 2 has tabs 210 and 220 of ring 190 in contact with the third key contact 120. The other related lock and key sections are similarly properly programmed.
As noted, each ring 190 in each key section (FIG. 2) contacts power input contact to which a power source V is connected.
The principles of the mode of operation of the invention are illustrated schematically in FIG. 9 for a simple lock including one key and one lock section. If the lock section and key section match, when the key is inserted in the lock, power is connected from voltage source V through input contact 130, ring 190, tabs 210 and 220, key contact 120, lock contact 380 which key contact 120 contacts, ring 460 and ring 333 to an external circuit which may include a relay 500 for operating a door or the like.
It is clear that, if the lock and key sections were not programmed properly so that the selected lock contact 380 did not contact the corresponding key contact 120, then the required output signals would not be provided and the door relay would not be operated.
Another more complex mode of operation of the invention is illustrated in FIG. 10 for a three-section lock 10, only portions of which are shown. In this case, two output rings 333 are operative, and they are connected through an AND gate 510 to apparatus such as the door relay 500. Again, if the lock and key sections match properly, the two outputs from rings 333 operate the AND gate and provide an output signal to operate the door relay. On the other hand, if the key does not match the lock, the AND gate is not operated, and the door relay is not operated.
It will be clear to those skilled in the art that a lock embodying the invention has many possible programs, and it may be used in many different types of circuits. In addition, a circuit may be devised to provide an alarm signal if a non-matching key is inserted in a programmed lock. This is described below.
Some of the possible program modes of operation of the invention are illustrated in FIGS. 11 to 15. The lock illustrated in FIG. 11 includes n sections, with each section including ten lock and key sections, only some of which are shown. Section 1 has its lock program ring 420 programmed so that the first lock contact designated 380A is contacted by ring 460 which contacts ring 333 (not shown). A lead 520A is connected through tab 335 on ring 333 to ring 460 and to the lock contact 380A. All of the other lock contacts 380 are connected together by ring 450 (not shown), which contacts ring contact 376 (not shown) and has a lead 530A connected to its tab 378.
In lock section 2, the program ring 420 is set to contact the second lock contact 380B, and this portion of the lock has its output lead 5208. The other lock contacts 380 are connected together and have their output lead 5308. The other lock sections are programmed as desired, and the n" section is programmed as shown.
Now, referring to the key sections in FIG. 11, they are all programmed to mate properly with the lock, and, accordingly, section 1 has the tabs 210 and 220 of ring in contact with the first key contact 120A. In addition, in section 1, ring 190 is connected through its contact 130 (not shown) and power input terminal 390 to a source of operating potential V by a lead 540. Section 2 has the tabs 210 and 220 of ring 190 in contact with the second key contact 1208, and the other key sections are similarly programmed to match the lock sections.
In the circuit arrangement illustrated in FIG. 11, the sections are interconnected by having lead 520A of the selected program position in section 1, the first position, connected to the power input terminals 390 of each of the other sections by lead 550 whereby power is coupled from source V to all of the sections of the lock. In adddition, each of the leads 520 B to N and 530 has an output terminal at which a signal or voltage can be detected if one is present. Thus, in operation of the arrangement of FIG. 11, when the key is inserted in the lock, the indicated circuits are completed andall of the output leads 520 B to N show'potential V at their output terminals and the leads 530 show no potential. If leads 520 are connected to a circuit such as that shown in FIG. 10, a door can be opened or some other operation can be performed.
FIG. 12 illustrates another arrangement for electrically connecting the sections of a lock. In FIG. 12, the selected lock and key positions are connected in series so that the circuit includes power source V connected by lead 540 to power input contact390 to the selected second 'key contact 1208 and to the second lock contact 380B and the various contact rings to lead 520A. Lead 520A is connected to turn to power input terminal 390 of the second section and through the selected first key and lock contacts to output lead 5208. Then output lead 520B is connected in series with the programmed key and lock contacts of the third section, etc., with lead 520" of the nl section being connected to power input contact 390 to the selected third key contact 120C and t0 the corresponding lock contact 300C and output lead 520A of the nth key and lock section. I
In operation of the arrangement of FIG. 12, when the key is inserted in the lock, the series circuit shown is completed and potential appearing on output lead 520N can be used to operate a door relay or the like.
In anothercircuit arrangement illustrated in FIG. 13,
' the voltage input source V is coupled in parallel to the power input terminals 390 of all of the sections, and, when lock and key sections match as shown, an output potential appears on all leads 520. As described above, all leads 520 can be coupled to an AND gate and to a door relay or the like.
FIG. 14 illustrates the circuit situation when a key does not match the'lock in which it is inserted. For purposes of illustration, all of the key and lock sections match; however, the nth sections do not match. In this case, all of the output leads 520 except the last provide the required output signal; however, the last does not. Accordingly, an AND gate to which the outputs 520 are connected will not receive a potential on lead 520N and will not provide the required output signal to operate a door relay. Referring to section n, the output lead 530N connected to the lock contacts to which the key contact 120A is connected carries a potential which can be used to energize an alarm or the like.
In the arrangement shown in FIG. 15, all of the lock sections have their program rings 420 set so that rings 460 and their contact rings 333 all contact power input terminals 390. The matching key similarly has all of its contact rings 190 in contact with the power input terminal 130 and none of the key contacts. In the circuit arrangement of FIG. 15, input voltage source V is connected by lead 540 to terminal 400 of input terminal 390 and thus to ring 460 and ring 333 and by lead 520A to all of the terminals 390.
As noted above, a lock can be connected in a circuit for properly opening a door or the like when'the key matches the lock or providing an alarm if there is a mismatch of any kind. One such alarm circuit, shown in FIG. 15, includes a connection from each programmed lock contact 380 (not shown) and its ring contact 333 through a resistive path 570 to a bus 580 which runs to ground. The bus 580 is coupled to the base of an NPN transistor 590 which has its emitter connected to one end of a load 600 such as a door relay. The ground side of the bus 580 is also connected (I) to the collector of PNP transistor 610, (2) through a resistive path 620 to the base of the transistor 610, and (3) through a resistive path 630 to the lead 640 between the emitter of transistor 590 and the door relay 600. The emitter of transistor 610 is also connected to the other end of the door relay. The rings 376 which are connected to unselected contacts in the lock are coupled by lead 650 to the base of transistor 610 and to an alarm 660.
In operation of the circuit of FIG. 15, transistor 590 is held OFF by the biases applied thereto and transistor 610 is biased to be ON and conducting. When a key is inserted into the lock and all sections match, the potential applied to the base of transistor 590 through the paths 570 causes transistor 590 to turn on and conduct and complete a current flow path through door relay 600 and ON transistor 610. If one or more of the key sections does not match the lock, positive potential is applied through a ring 376 to the base of transistor 610 which is turned off, opens the load circuit, prevents the door relay from operating, and operates the alarm 660.
Another alarm circuit shownin FIG. 16 has all of the selected outputs from a multi-section lock represented by lines A, B, C, D, connected as inputs to an exclusive OR gate 670 and to an AND gate 672. The nonselected outputs of the lock are connected together to two inputs of an OR gate 674, the output of which is coupled to one input of an exclusive OR gate 676 and to the alarm device 660. The output of the exclusive OR gate 670 is coupled to one input of a NAND gate 678 and to both inputs of an AND gate 680. The output of the NAND gate'678 is coupled to two inputs of a NAND gate 682, the output of which is coupled to one input of an exclusive OR gate 684, the output of which is coupled to the alarm device 660. The output of the AND gate 680 is coupled to the second input of the exclusive OR gate 684. The output of the AND gate 672 is coupled to the second input of the NAND gate 678 and to the second input of the exclusive OR gate 676, the output of which is coupled to the lock opening mechanism or relay represented by block 600.
The operation of the circuit of FIG. 16 is represented by the truth table of FIG, 17 in which numerals l to 9 represent the outputs of the various gates of FIG. 16. The truth table shows that, when A, B, C, D, etc., have the same polarity signal and E has the opposite polarity, then the various gates have the polarities shown, and
What is claimed is: 1. An electromechanical programmable lock comprising an annular lock section and an annular key section removably disposed within said lock section,
said lock section having a plurality of first electrical lock contacts, v
means in said lock section for selectively connecting one of said first electrical lock contacts in a first circuit, such selective connection comprising preprogramming of said lock section,
said key section having a plurality of second electrical key contacts, each of which contacts one of said lock contacts, and
means in said key section for selectively connecting one of said second electrical key contacts in a second circuit, such selective connection comprising pre-programming of said key section, whereby a selected first lock contactand a selected second key contact can be pre-programmed to match so that, when the pre-programmed key section is inserted into and matches the pre-programmed lock section, said first circuit and said second circuit are connected and operate as a permitted state for the programmable lock.
2. An electromechanical prising programmable lock comeach said lock section of said lock unit having a plurality of first electrical lock contacts,
separate means in each said lock section for selectively connecting one of said first electrical lock contacts therein to a separate first circuit, such connection of a lock contact to a first circuit comprising pre-programming of such lock contact,
each said key section of said key unit having a plurality of second electrical key contacts which contact corresponding ones of said first electrical lock contacts, and
separate means in each said key section for selectively connecting one of said second electrical key contacts therein to a separate second circuit, such connection of a key contact to a second circuit comprising pre-programming of such key contact,
each said key section mating mechanically and being in operative relation with a lock section to form a key-lock pair when said lock unit is inserted in said key unit, whereby in each key-lock pair, a selected first lock contact and a selected second key contact can be pre-programmed to match so that, when the key unit is inserted into the lock unit and all of the pre-programmed key-lock pairs match, each said first circuit and each said second circuit of each key-lock pair are connected together and operate as a permitted state for the programmable lock. 3. The apparatus defined in claim 2 wherein each said key section includes a generally annular insulating member having a central aperture and an array of apertures disposed about its annular body with a metal key contact disposed in each such aperture,
a program member rotatably disposed in said central aperture of each said key section and comprising an insulating member having a generally curved outer surface having a step therein,
a metal ring threaded on said program member of each key section and having a portion engaging said step and contact portions adapted to engage one of said key contacts, and
an electrical contact mounted on each said annular member and making contact with its associated conductive ring and accessible outside said annular member for connection to an electrical circuit.
4. The apparatus defined in claim 2 wherein each said lock section includes an annular member having a central aperture and having a generally planar base and a pedestal rising therefrom, a plurality of lock contacts seated on said pedestal and disposed about the annular body thereof, there being one lock contact for each of said second electrical contacts which are key contacts, a first contact ring seated on the top surface of said base of each annular member, a second contact ring seated on the bottom surface of said base of each annular member,
a terminal member mounted on each said pedestal and having a portion extending from said annular member, and
a rotatable program ring seated on each said pedestal and carrying a first split ring adapted to contact all but one of the associated lock contacts and the associated first contact ring,
each said program ring also carrying a second split ring having a portion adapted to contact said one of said first lock contacts and said second contact ring of the adjacent lock section.
5. The apparatus defined in claim 2 wherein each said lock section includes an annular insulating lock member having a central aperture and having a generally planar base and a pedestal rising therefrom, a plurality of lock contacts seated on said pedestaland disposed about the annular body thereof, there being one lock contact for each of said second electrical contacts which are key contacts,
a first contact ring seated on the top surface of said base of each annular lock member,
a second contact ring seated on the bottom surface of said base of each annular lock member,
an electrical terminal member mounted on each said pedestal and having a portion extending from said annular lock member for making electrical connection thereto,
a rotatable program ring seated on each said pedestal and carrying a first conductive member adapted to contact all but one of the associated lock contacts and the associated first contact ring,
each said program ring also carrying a second conductive member having a portion adapted to contact said one of said first lock contacts and said second contact ring of the adjacent lock section,
each said key section includes a generally annular insulating key member having a central aperture and an array of apertures disposed about its annular body with a metal key contact disposed in each such aperture, each key contact touching one of said lock contacts,
a program member rotatably disposed in said central aperture of each said key section and comprising an insulating disk having a generally'curved outer surface having a step therein,
a metal selector ring threaded on said program member and having a portion engaging said step and contact portions adapted to engage a selectable one of said key contacts by rotation of said program member, and
an electrical contact mounted on said annular key member and making contact with said metal selector ring and accessible outside said annular key member for connection to an electrical circuit.
6. An electromechanical programmable lock comprising a plurality of lock sections formed as a unit and a plurality of key sections formed as a unit, with said unit of key sections inserted in said unit of lock sections and with each key section mating with an associated lock section, there being first, second, third, fourth, and n" lock and key sections,
each lock section including a plurality of lock contacts disposed in a serial array,
lock program means in each lock section for selecting one of said lock contacts and connecting it in an electrical circuit,
each said key section includinga plurality of key contacts disposed in a serial array with each key contact touching one of said lock contacts,
key program means in each key section for selecting one of said key contacts and connecting it in said electrical circuit whereby an electrical circuit is completed between a selected key contact in each key section and a selected lock contact in the associated lock section.
7. The apparatus defined in claim 6 wherein, in each lock section, the selected lock contact is connected to an external operating circuit.
8. The apparatus defined in claim 6 wherein each key section includes a key input terminal to which an external circuit can be connected.
9. The apparatus defined in claim 7 wherein said external circuit includes a relay for performing an operating function as determined by the mating of said key and lock units.
10. The apparatus defined in claim 7 and including an AND gate, to the input of which each of said se lected lock contacts is connected, said AND gate having its output connected to a control circuit which is operated when said key and lock sections match in the programs and said AND gate receives signals representative of such matching.
11. The apparatus defined in claim 6 wherein the selected lock contact of the first lock section is connected to the selected key contacts of all of the other key sections of said lock,
all of the other selected lock contacts of the other lock sections being connected to a separate output lead on which an output signal may appear.
12. The apparatus defined in claim 6 wherein an input potential is coupled to the selected key contact of said first key section,
the selected lock contact of said first section being connected to the selected key contact of said second key section,
the selected lock contact of said second section being connected to the selected key contact of said third key section and so forth, with the selected key and lock contacts of all of the sections being connected in a series electrical circuit.
13. The apparatus defined in claim 6 and including an input circuit connected in parallel to the selected key contact of all of said key sections, and
a separate output lead from the selected lock contact of each of said lock sections. I
14. The apparatus defined in claim 6 wherein the selected lock contact of each said lock section is connected through an electronic switch, which is normally closed, to a utilization device,
a plurality of non-selected lock contacts connected to an alarm circuit whereby when said lock and key sections match in their selected contacts, said electronic switch operates said utilization device but when said lock and key sections do not match in their selected contacts, said alarm circuit operates.
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|U.S. Classification||340/5.25, 200/42.2, 361/172, 200/43.5, 340/543, 340/5.65, 340/5.3, 70/278.3|