Electronic lock

Abstract

An electronic combination lock for luggage and the like comprises a microcomputer, a display having a plurality of display locations, and a plurality of push buttons, one being associated with each display location. Each push button advances its associated display location through a sequence of digits and enables selection of a desired digit for display. A displayed set of digits is compared with a stored predetermined set of digits, and a bistable electromagnetic latch is operated to open the lock when the sets of digits match. The electromagnetic latch comprises a magnetic member pivotally mounted for rotation between a pair of pole pieces, the magnetic member having first and second stable rotational positions at which each magnetic pole is adjacent to a different pole piece, and a pair of oppositely wound coils associated with the pole pieces and responsive to the momentary flow of electrical current therethrough for producing a magnetic flux that causes the magnetic member to rotate from one position to the other.

Description

BACKGROUND OF THE INVENTION

This invention relates generally to electronic locks, and more particularly to electronic combination locks especially adapated for use on luggage and the like.

Mechanical, multiple dial combination locks are well known as locking devices on luggage cases and similar articles. In addition to providing security, they add a degree of attractiveness and distinctiveness to luggage and enhance its appeal. Although known combination locks perform satisfactorily, it is desirable to provide improved combination locks having greater flexibility in design, operation, function, and placement on the article on which they are used.

Electronic combination locks are well known for use at entrance ways of buildings and automobiles, for example, and they have a number of advantages over mechanical combination locks. However, a practical electronic combination lock for luggage must satisfy certain criteria. It must be small and compact, easy to operate, and, since it must be battery operated, it must have rather low power consumption. Moreover, since luggage is often stored for long periods of time, often in a locked condition, the lock must be designed so that the luggage can be opened should the battery go dead.

SUMMARY OF THE INVENTION

The invention provides an electronic lock which satisfies the above requirements and which affords certain other advantages.

Briefly stated, in one aspect, the invention provides an electronic lock comprising display means having a plurality of display locations, a plurality of push buttons, each push button being associated with a different location, means responsive to the actuation of a push button for displaying at the associated location a sequence of indicia and for enabling selection from the sequence of a selected indicium for display at the associated location, thereby enabling a selected set of indicia to be displayed, means for storing a predetermined set of indicia corresponding to the on-combination condition of the lock, means for comparing the displayed set of indicia with the stored predetermined set of indicia, and means responsive to the comparison for operating associated latch means for opening the lock when the sets of indicia match.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an elevational view illustrating an electronic lock in accordance with the invention on a luggage case;

FIG. 2 is a block diagram of an electronic lock in accordance with the invention;

FIG. 3 is a top view, partially broken away of an electromagnetic latch that may be used with the invention;

FIG. 4 is a longitudinal sectional view taken approximately along the line 4--4 of FIG. 3; and

FIG. 5 is a transverse sectional view taken approximately along the line 5--5 of FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Electronic locks in accordance with the invention are especially well adapted for use on luggage and the like, and will be described in that environment. However, as will be appreciated, this is illustrative of only one utility of the invention.

FIG. 1 illustrates one manner in which an electronic lock 10 in accordance with the invention may be used on a luggage case 12. As shown, the electronic lock may be disposed on an exterior surface of a sidewall 14 of the luggage case on one side of a carrying handle 16, and a manually operable actuator 18 may be disposed on the sidewall on the opposite side of the handle. The actuator may be slideable and may be coupled to a latching mechanism (not illustrated) disposed on the interior surface of the sidewall. The latching mechanism may comprise, for example, spaced latch members slideably or pivotally mounted within the case on the sidewall and engageable with associated hasps disposed on the interior surface of the lid 20 of the case for holding the parts of the case together. The latches may be coupled to the actuator by one or more control members arranged to move the latches to unlatching position when the actuator is operated. As will be described in more detail shortly, the electronic lock includes means for controlling the operation of the latching mechanism, as by blocking the movement of the actuator or a control member when the lock is off combination (locked) and permitting such movement when the lock is on combination (unlocked). The precise arrangement of the latching mechanism and the precise manner in which it is controlled by the electronic lock are not important to the invention. It will become apparent that the electronic lock may be adapted readily to control different latching mechanisms.

As shown in FIG. 1 and as will be described in more detail shortly, the electronic lock is battery operated and may comprise a display 22 for displaying combination indicia, e.g., digits, and a plurality of push buttons 24, 26 for entering combinations and for controlling the lock, all disposed on a faceplate 28. In a preferred form as described herein, the electronic lock may be a three "dial" combination lock (although a greater or smaller number may also be used), wherein the display has three separate display locations for displaying a three-digit combination, each display location being associated with one of the push buttons 24. (Push button 26 is used for controlling the operating mode and for opening the lock, as will be described shortly.) Depressing a push button 24 causes its associated "dial" to "spin" and to successively display a predetermined sequence of combination indicia, e.g., the digits 0-9. The push buttons preferably produce an audible click when depressed, and may be arranged so that each time a push button is depressed, its associated display location advances to the next digit of the sequence. If the push button is held depressed, the display location may automatically advance through the sequence of digits, momentarily stopping on each digit. When a desired digit appears on the display, releasing the push button causes the digit to remain displayed.

The electronic lock preferably has different operating modes, which include a time mode and a combination mode. Preferably, the electronic lock is arranged so that time of day normally is displayed on display 22. This is the time mode. Push button 26 is a lock/mode function push button which enables selection of the combination mode, wherein combination digits entered by push buttons 24 are displayed on display 22. Upon the lock being set on-combination, depressing push button 26 causes the lock to unlock, and the display automatically reverts to the time mode. This is an automatic display scramble feature that enables the lock to be left on-combination while preventing the combination from being observed by unauthorized persons.

FIG. 2 is a block diagram of a preferred form of the electronic lock. As shown, the electronic lock may comprise a microcomputer 30; and display 22 may be a multiplexed liquid crystal display (LCD) controlled by the microcomputer via an LCD controller 32. Preferably, microcomputer 30 is a type COP421C single-chip CMOS microcontroller available from National Semiconductor Corporation, Santa Clara, Calif. This is a four-bit microcomputer that contains on a single integrated circuit chip all of the necessary system timing, internal logic, ROM, RAM, and I/O necessary to form a complete microcomputer system. The LCD controller may be a type COP472 integrated circuit, also available from National Semiconductor Corporation, capable of directly driving a multiplexed 41/2-digit display. Data is loaded serially into the controller from the microcomputer and is held in internal latches. The controller contains an on-chip oscillator and generates all of the necessary waveforms for driving the display.

Microcomputer 30 includes a clock oscillator that may be crystal controlled by a 32 KHz watch crystal 36. The internal ROM is used for storing control programs that control the operation of the lock, as described hereinafter, and the RAM is used, for example, for storing a user-entered combination. The microcomputer has four inputs IN0-IN3 which may be connected to push buttons 24 and 26, as illustrated. The microcomputer further has outputs SO, SK, and DO which respectively provide serial data, serial clock, and a chip select signal to corresponding inputs DI, SK, and CS of controller 32. The controller has outputs BPA, BPB, and BPC which provide signals to corresponding backplanes of the LCD, and has 12 multiplexed outputs SA1-SC4 for driving segments of the LCD.

As illustrated in FIG. 2, the LCD has a plurality of display locations. Three such locations 40, 42, and 44 (each illustrated as displaying the digit "8") are associated with the three push buttons 24 connected to inputs IN0, IN1, and IN2, respectively. In the combination mode, each push button 24 controls the digit displayed by its associated display location, as previously described. In the time mode, display locations 40, 42, and 44 are used with another display location 46 (for the digit "1") for displaying time of day. Display locations 46 and 40 are used for displaying hours, and display locations 42 and 44 are used for displaying minutes and seconds, respectively. A pair of dots 48 between display locations 40 and 42 are used in the time mode to separate the hours and minutes portions of the display, and a pair of dots 50 in the upper left of the display may be employed for indicating A.M. or P.M. The three dots 52 adjacent to display locations 40, 42, and 44 are used in combination-changing and time-set modes, as will be described shortly.

Microcomputer 30 further has a pair of outputs 01 and 02, each connected to a driver circuit comprising, as shown, a pair of transistors 60, 62, for driving respective coils 64, 66 of an electromagnetic latch, a preferred form of which will be described shortly. Output 01 issues an output signal to coil 64 for unlocking the lock, and output 02 issues a signal to coil 66 for locking the lock. When either output goes high, its associated transistors 60, 62 conduct allowing current to flow through the associated coil. As shown, each coil may be shunted by a diode 68 for suppressing negative voltage transients.

FIGS. 3-5 illustrate a preferred form of a bistable electromagnetic latch 80 that may be employed with the electronic lock. As shown, the electromagnetic latch may comprise a magnetic member such as a disc magnet 82 that is polarized across one diameter to provide diametrically opposed north (N) and south (S) poles on its periphery. The disc magnet is pivotally supported for rotation about its axis by a shaft 84 supported between a pair of generally planar non-magnetic support brackets 86 and 88, as best shown in FIG. 4. An angled non-magnetic stop member 90 may be connected to one end of the shaft, as by a rivet 92, so that it rotates with the disc magnet and so that it is aligned with the magnetized diameter of the disc magnet, as shown in FIG. 3.

The arcuate portions 100 of a pair of soft iron pole pieces 102 may be disposed on opposite sides of the disc magnet, as shown in FIG. 3, and held in position by the support brackets 86 and 88 so as to provide a small air gap 104 between the periphery of the disc magnet and the pole pieces. Each pole piece may have an extended portion 106 that supports one end of a soft iron coil core 108 upon which coils 64 and 66 are wound. An insulated spacer 110 may be located between the coils.

The angled portion 112 of stop member 90 cooperates with ends 114, 116 (see FIG. 3) of the pole pieces, which function as stops, to limit the rotation of the disc magnet. The magnet, the pole pieces, and the soft iron coil core form a magnetic circuit, and since the magnetic flux produced by the disc magnet prefers to take the path of least reluctance, forces will be exerted on the disc magnet to cause its north and south poles to assume positions adjacent to the pole pieces. Although in FIG. 3 stop member 90 is shown positioned midway between stops 114 and 116, this is an unstable position since any slight jar or disturbance would cause the magnet to rotate and portion 112 to snap into engagement with either stop 114 or stop 116.

The two rotational positions of the magnet at which the stop member engages the ends of the pole pieces, i.e., stops 114, 116, are stable positions at which the north pole of the magnet is adjacent to the end 114 or 116 of one of the pole pieces and the south pole of the magnet is adjacent to the arcuate portion 100 of the other pole piece near its extended portion 106. The magnet will remain in a stable position without any power being applied to coils 64 or 66, and will resist movement away from either stop because of the magnetic forces exerted on it. In fact, the magnet will snap back to a stop position if rotated less than half of its stroke, i.e., to the midway position of FIG. 3, and released. As noted hereinafter, the two stable positions correspond to locked and opened positions of the electromagnetic latch.

Coils 64 and 66 may be wound in opposite directions on the soft iron coil core 108 so that when a DC voltage is applied to coil 64 the polarity of the magnetic flux produced across the pole pieces is opposite to that produced when coil 66 is energized. Accordingly, if coil 64 is energized and the disc magnet 82 is in a rotational position such that the magnetic flux produced by coil 64 and the magnetic flux produced by the magnet are of the same polarity, the magnet will snap to its other stable position where the polarities are opposite. Subsequent voltage pulses (of the same polarity) on coil 64 will have no effect on the rotational position of the magnet. However, if a DC voltage (of the same polarity as that applied to coil 64) is next applied to coil 66, the resulting magnetic flux across the pole pieces will have an opposite polarization to that produced by coil 64, and will cause the magnet to snap back to its initial position. Accordingly, energizing one coil will cause the disc magnet to snap to one stable position, and subsequently energizing the other coil will cause it to snap to the other position. As noted above, energizing the same coil a second or more times will not cause a change in the state of the electromagnetic latch. Therefore, accidentally energizing the wrong coil will not cause the latch to latch when it should be opened or to open when it should be latched. Of course, a single coil energized by opposite polarity voltage sources may also be employed for controlling the latch.

The electromagnetic latch can be switched from one stable position to the other using only a momentary voltage pulse. Once it is switched, it is magnetically latched in position and will remain in that position without the necessity for the further application of electrical power. Thus, elecrical power is conserved, which is important when using batteries as a power source. A voltage pulse of the order of 0.5 second or less is capable of switching the electromagnetic latch from one position to the other. Assuming four 1.5 volt alkaline pen light batteries as a power source and a coil resistance of 64 ohms, the coil current would be 0.094 amps, which would generate approximately 182 ampereturns of magnetomotive force for coils having aproximately 1,950 turns. This would enable the case to be locked and unlocked approximately 10,000 times over a one-year period while still having one-half of the rated power remaining in the batteries. Because of its symmetrical design, the rotary disc magnet is balanced about its pivotal axis and is highly resistant to shock and vibration. Moreover, because of its simple design, the electromagnetic latch is low in cost.

The electromagnetic latch may be coupled to a latching mechanism to control it in many different ways. For example, a tab could be added to stop member 90 so that in one position of the latch the tab would enter an area that would block the movement of an actuator or some other movable member of the latching mechanism. Preferably, the latch is interfaced with the latching mechanism so that in its quiescent state no component of the latching mechanism engages the tab, the stop member or any other portion of the disc magnet (except when the latching mechanism is operated and the electromagnetic latch is in blocking position), since this would add additional friction which would have to be overcome for switching. Of course, the latch may also be interfaced with the latching mechanism using other arrangements employing cams, levers or rods. However, this may add friction and mechanical load to the latch, which would result in higher current drain and reduced battery life.

As indicated earlier, the operation of the electronic lock is controlled by the microcomputer 30 (FIG. 2) in accordance with the programs stored in its ROM. A preferred operation will now be described.

Preferably, display 22 normally displays time. To open the lock, first the lock/mode push button 26 is depressed to enter the combination mode. This disables the time display and the lock may be then set on-combination using push buttons 24 to enter the combination, one digit at a time. As noted earlier, each time a push button is depressed, its associated display location displays the next successive digit in the sequence. Holding the button depressed automatically may advance the display location through the sequence of digits. When the correct digit appears at the associated display locations, the push button is released. The next push button is depressed and the next digit of the combination is entered in a similar manner. When the correct combination is displayed, the lock/mode push button 26 may be depressed. This causes the displayed combination, which may be temporarily stored in reselected locations of the RAM, to be compared to the previously stored combination of the lock. If the displayed combination and the previously stored combination match, i.e., the lock is on-combination, output 01 of the microcomputer will go high for a predetermined period of time, e.g., 0.5 second, which turns on its associated transistors 60 and 62 and applies a positive voltage pulse to coil 64. This switches the electromagnetic latch 80 to open position, as previously described, and causes the display to automatically revert to the time mode so that the combination cannot be observed by unauthorized persons. To lock the case, pushing any one of push buttons 24 when the lock is on-combnation will cause output 02 of the microcomputer to go high for the predetermined period of time, thereby applying a positive voltage pulse to coil 66 which switches the electromagnetic latch to locked position.

Whenever the electronic lock is energized by inserting batteries, the combination is automatically set at 0-0-0, and time is displayed. To reset the lock to a different combination or to reset an existing combination to a new combination, the lock is first set on-combination. Then, two of the push buttons 24, e.g., the push buttons associated with inputs IN0 and IN2, are simultaneously depressed. A decimal point 52 (FIG. 2) will appear in front of each of the display locations 40, 42, and 44. Push buttons 24 are then used to enter the new combination into the display. When the desired new combination is displayed, pressing the lock/mode push button 26 causes the combination to be stored in the RAM of the microcomputer in place of the old combination and returns the electronic lock to normal operation. The decimal points will disappear and the display will return to the time mode.

To set the correct time, with the electronic lock in the time mode, two of push buttons 24, e.g., those associated with inputs IN0 and IN2, may be simultaneously depressed, causing decimal points 52 to appear on the display as before. The correct seconds, minutes and hours are then entered, in succession, using the lock/mode push button 26 as follows. First, the lock/mode push button is depressed and held until display location 44 indicates the desired seconds. When the desired seconds appear, the push button is released. Next, the push button is again depressed and held until display location 42 indicates the desired minutes, at which time it is again released. The push button is then depressed and held for a third time until display locations 40 and 46 (if required) indicate the desired hours, and the A.M./P.M. indicator is correct. A.M. and P.M. may be indicated, for example, by the dots 50 on the display. Once the correct time has been set, the electronic lock may be removed from the time-set mode by again depressing the two push buttons 24 used to enter the time-set mode. The decimal points 52 will disappear, and the display will indicate the correct time.

Preferably, the electronic lock also incorporates a fail-safe feature that automatically causes it to switch to the unlocked position when the battery voltage drops to a predetermined level, thereby avoiding a locked case with dead batteries. The lock will thereafter remain inoperative until the batteries are replaced. If desired, a low battery indicator may also be provided on the display to indicate when the batteries should be replaced.

The electronic lock may also incorporate other features, if desired, such as an alarm beeper that will signal locking and unlocking action, a calendar mode whereby the display also displays the date, and a "zero" stop feature whereby holding a push button 24 depressed (when in the combination mode) advances its associated display location through the sequence of digits until "0" is displayed. The lock could then be set on-combination simply by depressing each push button the required number of times to enter the correct set of digits. This is useful, for example, for opening the lock in the dark. The zero stop feature could also be implemented by automatically setting the display to 0-0-0 each time the combination mode is entered.

Control programs for microcomputer 30 to enable the foregoing functions to be performed may be readily implemented using existing programs and techniques well known to those skilled in the art. Appendix A presents a preferred program for implementing these functions.

While a preferred embodiment of the invention has been shown and described, it will be apparent to those skilled in the art that changes can be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.

APPENDIX A______________________________________000 00 RESET CLRA001 3364 LEI #$4; L DRIVERS ENABLED003 3388 LBI #$08005 70 STII #$0006 00 CLRA007 333C CAMQ; ZERO Q LATCHES009 50 CAB00A 333E OBD00C 3351 OGI #$100E 3352 OGI #$2010 3354 OGI #$4012 3350 OGI #$0014 44 NOP015 3D LBI #$3E016 70 STII #$0017 0B LBI #$0C018 75 STII #$5019 75 STII #$501A 75 STII #$5; STORE INIT. COMB.01B 08 LBI #$0901C 70 STII #$001D 70 STII #$001E 70 STII #$0; ZERO COMB DISPLAY REG.01F 29 LBI #$2A020 7F STII #$3B021 3A LBI #$3B022 70 STII #$0; SET COMB DISPLAY MODE23 3398 LBI #$1825 00 BK CLRA; CLEARS SECS/MINS/HOURS & SET AM.27 E5 JP BK; SAME PAGE JUMP.28 3388 LBI #$08; SCRATCH PAD2A 332C CQMA2C 46 SMB #$2; SET CLOSE2D 4C RMB #$0; SET COLON OFF2E 06 X2F 333C CAMQ31 33A8 LBI #$2833 7E STII #$F34 77 STII #$735 80 JSRP TMDEL36 3E LBI #$3F37 332C CQMA39 42 RMB #$23A 06 X3B 333C CAMQ; CLEAR CLOSE SOLENOID3D 2B LBI #$2C3E 70 STII #$0; CLOSED FLAG SET03F 33A8 NORMAL LBI #$0841 71 STII #$0142 71 STII #$0143 80 JSRP TMDEL44 3328 NOTIME ININ; INPVTS KEYS TO A46 44 NOP47 51 AISC #$148 CC JP KEYPRG; KEY DEPRESSED49 636A JMP KEYDN; NO KEY PRESSED4B 44 NOP4C 3D KEYPRG LBI #$3E; KEY FLAG REG.4D 00 CLRA4E 21 SKE4F 636A JMP KEYDN; TEST FOR KEY TOOPEN51 40 COMP52 06 X; SET KEY FLAG53 33A8 LBI #$2855 70 STII #$056 72 STII #$557 80 JSRP TMDEL; 0.1 SEC DELAY58 3328 ININ; READ KEYS IN5A 3D LBI#$3E5B 63E2 JMP FIXAGN5D 445E 444460 29 OPON LBI #$2A; OPEN KEY ONLY61 00 CLRA62 40 COMP63 21 SKE64 62F8 JMP PROG; IF = TO ZERO PROG. MODE66 2309 LDD #$0968 0B LBI #$0C69 21 SKE6A F7 JP FLIP6B 230A LDD #$0A6D 0C LBI #S0D6E 21 SKE6F F7 JP FLIP70 230B LDD #$0B72 0D LBI #$0E73 21 SKE74 F7 JP FLIP75 6227 JMP OPSOL; IF DISP = COMB OPEN77 69A9 FLIP JSR CLSOL79 3A FLIP LBI #$3B7A 00 CLRA7B 21 SKE7C 6225 JMP COMX7E 6220 JMP CONX220 71 CONX STII #$1; NOW COMB/SET TIME221 4444 FX NOP NOP; CLEAR SOL, 2223 636A JMP KEYDN225 70 COMX STII #$0; NOW TIME/SET COMB226 E1 JP FX227 2B OPSOL LBI #$2C228 00 CLRA229 21 SKE22A ED JP BUZONL22B 7F STII #$F; NEEDS OPENING22C F4 JP BUZ+22D 3388 BUZONL LBI #$0822F 332C CQMA231 06 X232 43 RMB #$3233 Fb JP OFVER234 3388 BNZ+ LBI #$08236 332C CQMA238 06 X239 4D SMB #$023A 47 OFVER SMB #$123B 333C CONTIN CAMQ; TURN FUNCTIONS ON23D 33A8 LBI #$2823F 7F STII #$F240 7F STII #$F241 80 JSRP TMDEL242 33A8 LBI #$28244 7F STII #$F245 7F STII #$F246 80 JSRP TMDEL247 332C CQMA249 06 X24A 45 RMB #$124B 4C RMB #$024C 333C CAMQ; TURN FUNCTIONS OFF24E 6079 CLD JMP FLIPX250 636A KYDX JMP KEYDN252 33A8 ON1 LBI #$28254 71 STII #$F255 71 STII #$7256 80 JSRP TMDEL257 33A8 LBI #$28259 7F STII #$F25A 72 STII #$725B 80 JSRP TMDEL; 1/2 TO/SEC DELAY25C 2E LBI #$2F25D 3328 ININ25F 40 COMP260 06 X261 05 LD; STORE ININ PERM262 01 SKMBZ263 D0 JP KYDX264 44 NOP265 2E ONGS LBI #$2F; ONLY 3 OTHER KEYS ON266 44 NOP267 44 NOP268 00 CLRA269 44 NOP26A 5E AISC #$E26B 21 SKE26C 62A0 JMP NOX: NOT ALL CLOSED26E 3A LBI # $3B26F 00 CLRA270 21 SKE; IF = 0 THEN COMB271 6293 JMP TMB; TIME MODE273 39 LBI #$3A274 70 STII #$0; PROG. DEF. COMB275 2309 LDD #$09277 0B LBI #$0C278 21 SKE279 628F UPXX JMP OKSKB27B 230A LDD #$0A27D 0C LBI #$0D27E 21 SKE27F F9 JP UPXX280 44 NOP281 230B LDD #$0B283 0D LBI #$0E284 21 SKE285 CF JP OKSBK286 44 NOP287 6995 JSR PPZRO; SET PROG. PASS289 39 LBI #$3A28A 70 STII #$0; SET COMB MODE PROG.28B 29 LBI #$2A28C 70 STII #$0; SET PROG. MODE28D 636A JMP KEYDN28F 69C8 OKSBK JSR PPFL291 636A JMP KEYDN293 39 TMB LBI #$3A294 7F STII #$F; TIME PROG.295 0E LBI #$0F296 70 STII #$0; SECONDS POINTER/PROG.297 29 LBI #$2A; CHECK PROG MODE298 00 CLRA299 21 SKE29A DE JP ST; NON-PROG MODE29B 7F STII #$F; PROG MODE29C 63F6 ND JMP ALLCLR29E 63B5 ST JMPKZ2A0 00 NOX CLRA; NOT ALL CLOSED2A1 44 NOP2A2 52 AISC #$22A3 21 SKE2A4 E7 JP PRNT2A5 EF JP LKFTHR2A6 44 NOP2A7 52 PRNT AISC #$22A8 21 SKE2A9 EB JP PRNNT2AA EF JP LKFTHR2AB 54 PRNNT AISC #$42AC 21 SKE2AD 636A JMP KEYDN; 1 KEY2AF 3A LKFTHR LBI #$3B2B0 00 CLRA2B1 21 SKE2B2 62 JMP TMCHG; TIME MODE2B4 29 LBI #$2A; PROG. MODE2B5 00 CLRA2B6 40 COMP2B7 21 SKE2B8 6995 JSR PPZRO; SET PROG. PASS. REG.2BA 2C LBI #$2D2BB 00 CLRA2BC 52 AISC #$22BD 06 X2BE 05 LD2BF 2E LBI #$2F2C0 21 SKE; IS D1 DEPRESSED2C1 C8 JP D22C2 2D LBI # $2E2C3 79 STII #$9; SET D1 ADDR2C4 63F0 JMP PRDGIC; INCR. DIGIT #12C6 4444 NOP NOP2C8 2C D2 LBI #$2D2C9 52 AISC #$22CA 06 X2CB 05 LD2CC 2E LBI #$2F2CD 21 SKE; IS D2 DEPRESSED2CE D5 JP D32CF 2D LBI #$2E2D0 7A STII #$A; SET D2 ADDR2D1 63F0 JMP PRDGIC; INE DIGIT #22D3 4444 NOP NOP2D5 2C D3 LBI #$2D2D6 54 AISC #$42D7 06 X2D8 05 LD2D9 2E LBI #$2F2DA 21 SKE; IS D3 DEPRESSED2DB 636A JMP KEYDN2DD 2D LBI #$2E2DE 7B STII #$B; SET D3 ADDR2DF 63F0 JMP PRDGIC; INC DIGIT 32E1 4444 NOP NOP2E3 2E TMCHG LBI #$2F2E4 00 CLRA2E5 52 AISC #$22E6 21 SKE2E7 636A JMP KEYDN2E9 3A LBI #$3B2EA 6398 JMP FIXIT; DISPLAY SECS.2EC 7E FXTT STII # $F2ED 7F STII #$72EE 80 JSRPTMDEL2EF 33A8 LBI #$282F1 7F STII #$F2F2 7F STII #$72F3 80 JSRP TMDEL; .75 SEC.2F4 3A LBI #$3B2F5 71 STII #$1; CHANGE BACK TO MIN/SECS HRS.2F6 636A JMP KEYDN2F8 3A PROG LBI #$3B2F9 00 CLRA2FA 21 SKE2FB 630D JMP TMPROG2FD 0B LBI #$0C2FE 2309 LDD #$09300 04 XIS301 230A LDD #$0A303 04 XIS304 230B LDD #$0B306 04 XIS; COMB OVERWRITTEN307 29 LBI #$2A308 7F STII #$F; STORE PROG MODE309 3A LBI #$3B30A 71 STII #$1; SET TIME HRS/MIN30B 63A0 JMP ALFIX30D 0E TMPROG LBI #$0F30E 00 CLRA30F 21 SKE310 D3 JP MINSCK311 E2 JP SECSET312 44 NOP313 44 MINSCK NOP314 51 AISC #$1315 21 SKE316 D9 JP HRSCK317 6345 JMP MNSET319 44 HRSCK NOP31A 51 AISC #$131B 21 SKE31C DF JP HRNOT31D 634D JMP HRSET31F 70 HRNOT STII #$0; SET TIME PROG = SEC'S.320 636A JMP KEYDN322 3A SECSET LBI #$3B323 72 STII #$2; SET SECS DISPLAY324 1E LBI #$1F325 70 STII #$0; SET LSD BLINK326 2C LBI #$2D327 44 NOP328 79 STII #$9329 68E8 PSXAGN JSR DISP32B 6962 JSR BLINK32D 69F3 JSR PKEYHL32F 21 SKE330 F8 JP INXAGN331 0E LBI #$0F332 22 SC333 00 CLRA334 30 ASC335 06 X336 636A JMP KEYDN338 33A8 INXAGN LBI #$28; TIME DELAY33A 7F STII #$F33B 71 STII #$733C 80 JSRP TMDEL33D 1F LBI #$1033E 232D LDD #$2D340 50 CAB341 63B0 JMP KXX343 44 NOP344 44 NOP345 3A MNSET LBI #$3B346 71 STII #$1; SET MIN/SET DISPLAY347 1E LBI #$1F348 70 STII #$0; SET LSB BLINK349 7B STII #$B34B C1 JP PSXAGN34C 44 NOP34D 3A HRSET LBI #$3B34E 71 STII #$1; SET HRS MIN34F 1E LBI #$1F350 7F STII #$F; SET MSD BLINK351 2C LBI #$2D352 44 NOP353 7D STII #$D354 68E8 PZXAGN JSR DISP356 6962 JSR BLINK358 69F3 JSR PKEYHL35A 21 SKE35B E1 JP IEXAGN35C 44 NOP35D 0E LBI #$0F35E 70 STII #$035F 636A JMP KEYDN361 33A8 IEXAGN LBI #$28363 70 STII #$0364 77 STII #$7365 80 JSRP TMDEL366 69FC JSR HZINC368 D4 JP PZXAGN369 44 NOP36A 3328 KEYDN ININ36C 40 COMP36D 2E LBI #$2F36E 70 STII #$036F 2E LBI #$2F370 21 SKE371 F5 JP OVERCL; KEYS STILL DEPRESSED372 06 X373 3D LBI #$3E374 06 X; CLEAR KEY FLAG REG375 68E8 OVERCL JSR DISP377 0F LBI #$0378 22 SC379 00 CLRA37A 30 ASC37B 16 X,0137C 20 SKC37D 603F UP JMP NORMAL37F 00 CLRA380 30 ASC381 36 X,11382 20 SKC383 637D HUP JMP UP385 00 CLRA386 30 ASC387 16 X,01388 20 SKC389 C3 JP HUP38A 00 CLRA38B 30 ASC38C 06 X38D 20 SKC38E C3 JP HUP38F 603F JMP NORMAL391 7F STII #$F392 74 STII #$04393 80 JSRP TMDEL394 39 LBI #$2A395 7F STII #$F396 63F6 JMP ALCLR398 06 FIXIT X; SECS MODE399 68E8 JSR DISP39B 33A8 LBI #$2839D 62EC JMP FXTT3E2 21 FIXAGN SKE3E3 E6 JP OFVR3E4 636A JMP KEYDN; NONE DEPRESSED3E6 40 OFVR COMP3E7 5E AISC #$E3E8 6060 JMP OPON3EA 6252 JMP ON13F0 69A9 PRDGIC JSR CLSOL3F2 69D8 JSR DIGINC3F4 636A JMP KEYDON3F6 3388 ALCLR LBI #$083F8 332C CQMA3FA 43 RMB #$33FC 333C CAMQ3FE 603F JMP NORMAL3B0 68CF KXX JSR ADD603B2 44 NOP3B3 6329 JMP PSXAGN3B5 06 K2 X3B7 3388 LBI #$08338 332C CQMA3BA 06 X3BB 4B SMB #$33BC 333C CAMQ3BF 636A END JMP KEYDN3A0 3388 ALLFIX LBI #$083A2 332C CQMA3A4 06 X3A5 43 RMB #$33A6 333C CAMQ3A8 6227 JMP OPSOL;PRECEDE BY LOADING 28/29 WITH # OF PASSES0080 33/B8 TMDEL LBI #$380082 7F STII #$F0083 7F STII #$F; STORE INTERM TIMERS0084 00 SUBC CLRA; IN 38/390085 32 SUBA RC; SET BORROW0086 10 CASC0087 8A JP NSB; BORROW0088 06 X; NO BORROW0089 85 JP SUBA008A 06 NSP X008B 33B8 LBI #$38008D 00 CLRA0085 10 CASC008F 93 JP TIMUP; BORROW0090 06 X; NO BORROW0091 38 LBI #$390092 84 JP SUBC0093 44 TIMUP NOP; INITIAL 2 MSEC0094 41 SKT0095 98 JP NOPE0096 60AD JMP TMSUB0098 33A8 NOPE LBI #$28009A 00 CLRA009B 32 RC009C 10 CASC009D A0 JP NSC; BORROW009E 06 X; NO BORROW009F 80 JP TMDEL00A0 06 NSC X00A1 28 LBI #$2900A2 00 CLRA00A3 10 CASC00A4 A9 JP TMUP00A5 06 X00A6 44 NOP00A7 44 NOP00A8 80 JP TMDEL; SEC PASSES OVER00A9 48 TMUP RET; FINISH00AA 44 NOP00AB 44 NOP00AC 44 NOP00AD 29 TMSUP LBI #$2A00AE 00 CLRA00AF 21 SKE00B0 B5 JP TMMUB; .noteq. PROG MODE00B1 3A LBI #$3B; = PROG MODE00B2 00 CLRA00B4 98 JP NOPE00B5 3B TMMUB LBI #$3C00B6 32 RC; SUBTRACT ONE (BORROW)00B7 00 CLRA00B8 10 CASC00B9 44 NOP00BA 04 XIS00BB 00 CLRA00BC 10 CASC00BD C0 JP GN00BE 06 X00BF 98 JP NOPE00C0 77 GN STII #$700C1 3B LBI #$3C; 128 RESET (127)00C2 7F STII #$F00C3 18 LBI #$19; SECS On00C4 68CF JSR ADD6000C6 98 JP NOPE00C7 1A LBI #$1B; MINUTES00C8 68CF JSR ADD6000CA 98 JP NOPE00CB 69FC JSR HZINC00CD 98 JP NOPE00CE 44 NOP00CF 22 ADD60 SC00D0 00 CLRA0D1 44 NOP0D2 56 AISC #$60D3 30 ASC0D4 4A ADT; ADD DECIMAL0D5 04 XIS0D6 00 CLRA0D7 56 AISC #$60D8 30 ASC0D9 4A ADT0DA 06 X0DB 00 CLRA0DC 56 AISC #$60DD 21 SKE0DE 48 RET0DF 00 CLRA; = 60; ZERO SECS OR MINS0E0 07 XDS0E1 44 NOP0E2 49 RETSK0E3 44 NOP0E4 56 FADTN AISC #$60E5 30 ASC0E6 4A ADT0E7 48 RET0E8 00 DISP CLRA0E9 3A LBI #$3B0EA 21 SKE0EB EE JP NXT0EC 6141 JMP COMB0EE 44 NXT NOP0EF 51 AISC #$10F0 21 SKE0F1 F4 JP SECX0F2 6110 JMP MHRS0F4 18 SECX LBI #$190F5 69 SC JSR SBCHL0F7 3351 OGI #$10F9 3350 OGI #$00FB 19 LBI #$1A0FC 6959 JSR SBCHG0FE 3352 OGI #$2100 3350 OGI #$0102 00 CLRA103 40 COMP104 50 CAB105 333E OBD107 3354 OGI #$4109 3350 OGI #$010B 00 CLRA10C 50 CAB10D 333E OBD10F E8 JP LSTDEC110 1A MHRS LBI #$1B111 695C JSR SBCHL113 3351 OGI #$1115 3350 OGI #$0117 1B LBI #$1C118 6959 JSR SBCHG11A 3352 OGI #$211C 3350 OGI #$011E 1C LBI #$1D11F 6959 JSR SBCHG121 335A OGI #$4123 3350 OGI #$0125 1D LBI #$1E126 6959 JSR SBCHG128 3358 LSDEC OGI #$812A 3350 OGI #$0; M/HRS OUT12C 00 LSTDEC CLRA12D 3398 LBI #$1812F 21 SKE; IF = 0 THEN AM130 F7 JP PM131 3388 LBI #$08; AM SET133 332C CQMA135 43 RMB #$3; CLEAR PM/AM136 FC JP CLN137 3388 PM LBI #$08139 332C CQMA13B 4B SMB #$313C 4D CLN SMB #$013D 06 X13E 333C CAMQ140 48 RET141 08 COMB LBI #$09142 695C JSR SBCHL144 3351 OGI #$1146 3350 OGI #$0148 09 LBI #$0A149 6959 JSR SBCHG14B 3352 OGI #$214D 3350 OGI #$014F 0A LBI #$0B150 6959 JSR SBCHG152 3354 OGI #$4154 3350 OGI #$0156 6BD0 JSR FINISH158 48 RET159 44 SBCHG NOP15A 44 NOP15B 44 NOP15C 05 SBCHL LD15D 50 CAB15E 333E OBD160 48 RET161 44 NOP162 2A BLINK LBI #$2B163 7E STII #$E164 1E BLINKX LBI #$1F; BLINK SIDE165 00 CLRA166 21 SKE; IF = THEN LSDS167 F1 JP MSDS168 3388 LBI #$0816A 332C CQMA; LSD'S16C 06 X16D 46 SMB #$216E 33/3C CAMQ; SET BLANK170 F9 JP OVER171 3388 MSDS LBI #$08173 332C CQMA; MSD'S175 47 SMB #$1176 06 X177 33/3C CAMQ; SET BLANK179 33/A8 OVER LBI #$2817B 71 STII #$017C 71 STII #$C17D 80 JSRP TMDEL; .2 SEC.17E 3388 LBI #$08180 332C CQMA182 45 RMB #$1183 06 X184 42 RMB #$2185 33/3C CAMQ; RESET ALL BLANKS187 33/A8 LBI #$28189 71 STII #$118A 73 STII #$318B 80 JSRP TMDEL; .4 SEC.18C 22 SC18D 00 CLRA18E 2A LBI #$2B18F 30 ASC190 06 X191 20 SKC192 6164 JMP BLINKX; 2 PASSES194 48 RET ;PROG PASS ZERO195 0F PPZRO LBI #$0196 00 CLRA197 44 NOP198 16 X (r = 01)199 00 CLRA19A 44 NOP19B 36 X (r = 11)19C 00 CLRA19D 44 NOP19E 16 X (r = 01)19F 00 CLRA1A0 06 X; ZERO PROG PASS1A1 332C CQMA1A3 06 X1A4 4B SMB #$3; SET PROG MODE1A5 333C CAMQ1A7 48 RET1A8 44 NOP1A9 2B CLSOL LBI #$2C1AA 00 CLRA1AB 40 COMP1AC 21 SKE1AD 48 RET; NO NEED TO CLOSE1AE 70 STII #$01AF 3388 LBI #$08; NEED S TO BE CLOSED1B1 332C CQMA1B3 46 SMB #$2; CLOSE1B4 06 X1B5 47 SMB #$1; ALARM1B6 333C CAMQ1B8 33A8 LBI #$281BA 7F STII #$F1BB 7F STII #$F1BC 80 JSRP TMDEL1BD 3388 LBI #$081BF 332C CQMA1C1 42 RMB #$2; DEACTIVATE SOL.1C2 06 X1C3 45 RMB #$1; ALARM1C4 333C CAMQ1C6 48 RET1C7 44 NOP1C8 0F PPFL LBI #$001C9 00 CLRA1CA 40 COMP1CB 16 X (r = 01)1CC 00 CLRA1CD 40 COMPICE 36 X (r = 11)ICF 00 CLRA1D0 40 COMP1D1 16 X (r = 01)1D2 00 CLRA1D3 40 COMP1D4 06 X1D5 48 RET1D6 44 NOP1D7 44 NOP1D8 4444 DIGINC NOP NOP1DA 2D INCAGN LBI #$2E1DB 25 LD; LOAD DIGIT ADDR.1DC 50 CAB1DD 00 CLRA1DE 22 SC1DF 68E4 JSR FADTN1E1 06 X1E2 44 NOP1E3 E5 JP STDEP1E4 48 RET1E5 68E8 STDEP JSR DISP1E7 33A8 LBI #$281E9 7F STII #$F1EA 77 STII #$71EB 80 JSRP TMDEL1EC 3328 ININ1EE 40 COMP1EF 2C LBI #$2D1F0 21 SKE1F1 48 RET; NOT DEPRESSED1F2 DA JP INCAGN1F3 3328 PKETHL ININ1F5 40 COMP1F6 3E LBI #$3F1F7 06 X1F8 05 LD1F9 4C RMB #$0; SET MEM BIT = 11FA 48 RET1FB 44 NOP1FC 1C HZINC LBI #$1D; HRS1FD 22 SC1FE 00 CLRA1FF 56 AISC #$6200 30 ASC201 4A ADT202 04 XIS203 00 CLRA204 56 AISC #$6205 30 ASC206 4A ADT207 06 X; HOURS STORED208 1D LBI #$IE209 00 CLRA; NO NEED TO RC20A 51 AISC #$120B 21 SKE20C 48 RET20D 1C LBI #$1D20E 51 AISC #$120F 21 SKE210 D7 JP THRCK; .noteq. TO 12211 3398 LBI #$18213 06 X214 40 COMP215 06 X; TOGGLE AM/PM REG216 48 RET217 32 THRCK RC218 51 AISC #$1219 44 NOP21A 21 SKE21B 48 RET21C 71 STII #$1; = 13 SET HRS = 121D 70 STII #$021E 48 RET3D0 00 FINISH CLRA3D1 50 CAB3D2 333E OBD3D4 3358 OGI #$83D6 3350 OGI #$0; ZERO MSD3D8 3388 LBI #$083DA 332C CQMA3DC 43 RMB #$ 3; CLEAR AM/PM3DD 4C RMB #$0; CLEAR COLON3DE 06 X3DF 333C CAMQ3E1 48 RET______________________________________

Claims

1. An electronic lock comprising display means having a plurality of display locations, a plurality of push buttons, each push button being associated with a different display location, means responsive to the actuation of each push button for displaying at the associated display location a sequence of indicia and for selecting from the sequence, under the control of the push button, a selected indicium for display at the associated display location, thereby enabling a selected set of indicia to be displayed by the display means, means for storing a predetermined set of indicia corresponding to the on-combination condition of the lock, means for comparing the displayed set of indicia with the stored predetermined set of indicia, and means responsive to the comparison for operating associated latch means to open the lock when the sets of indicia match.

2. The lock of claim 1, wherein the means responsive to the actuation of a push button comprises means for displaying a next indicium of the sequence for each depression of the push button and means for successively displaying the indicia of the sequence when the push button is held depressed.

3. The lock of claim 1 further comprising means responsive to the simultaneous depression of two push buttons, upon the lock being on-combination, for storing a new predetermined set of indicia entered via said push buttons.

4. The lock of claim 1 further comprising means for automatically scrambling the indicia displayed by the display means after the lock is opened.

5. The lock of claim 4, wherein the lock has a combination display mode in which the combination indicia are displayed, and has a time display mode in which time of day is displayed in place of said indicia.

6. The lock of claim 5, wherein said automatic scrambling means comprises means for automatically placing the lock in the time display mode after it is opened.

7. The lock of claim 5 further comprising another push button, and means responsive to the actuation of said other push button for selecting the display mode.

8. The lock of claim 1, wherein said associated latch means comprises an electromagnetic latch having a movable member, the movable member having a first position at which it blocks the operation of a latch mechanism and having a second position at which it permits such operation, and wherein said operating means comprises means for applying electrical current to the electromagmetic latch to cause the movable member to move from one position to the other.

9. The lock of claim 1, wherein the lock is battery operated and further comprises means responsive to the battery voltage dropping to a predetermined level for opening the lock.

10. The lock of claim 1, wherein said displaying and selecting means responsive to the actuation of each push button, said storing means, said comparing means, and said operating means all comprise a microcomputer, and wherein said display means comprises an LCD display and associated controller connected to the microcomputer.

11. The lock of claim 1, wherein the lock is mounted on a luggage case having a latching mechanism, and said latch means includes means for inhibiting the operation of the latching mechanism when the lock is off-combination.