US 20070096867 A1
A vending machine uses a field-programmable electronic lock that learns a key code from a corresponding electronic key. The electronic lock has a learning process activation device that is accessible when the door of the vending machine is in the open position. Using the learning process activation device, a service person activates the electronic lock to perform a key code learning operation, in which the electronic lock receives a key code transmitted from an electronic key and stores the key code in a non-volatile memory for future access control of the vending machine. Data encryption is employed in the communications between the key and the lock to ensure the security of the communications. A communication device installed in the vending machine for communicating with a home base computer allows the operation of the electronic lock to be remotely controlled for access control and auditing purposes.
1. An access control system for a plurality of vending machines wherein each vending machine has a door openable for accessing contents of each vending machine and an electronic lock for unlocking the door of each vending machine, the access control system comprising:
at least one electronic key comprising:
a wireless communication interface for transmitting and receiving communications over a wireless band;
a non-volatile memory having stored therein at least one operation limit parameter, and computer executable instructions for performing an encryption operation based on an encryption code; and
an activation device connected to the microcomputer and operable for generating an activation signal for triggering the microcomputer to initiate an access code transmission operation in which the microprocessor performs the encryption operation to encrypt a value including an access code, and the wireless communication interface is used to transmit the encrypted value,
wherein the microcomputer is programmed to perform a bi-directional challenge-response process during a key transmission operation with an electronic lock on a vending machine using encrypted communications through the wireless communication interface; and
at least one key management system for management of electronic keys used to access electronic locks of vending machines, comprising:
a computer having a software program for key management functionality;
a memory containing key management data; and
a key reader communicating with the computer for interfacing the computer with an electronic key; the software program having computer-executable instructions for performing an key programming operation with the steps of:
retrieving from the memory information of a user of the key and at least one operation limit parameters for said key;
sending the at least one operation limit parameter through the key reader to the key for writing into a memory of the key; and
each electronic lock comprising an electronic control circuit including a microprocessor, a memory and a wireless communication interface for transmitting and receiving wireless communications, the microcomputer being programmed to perform a bi-directional challenge-response process with an electronic key using encrypted communications through the wireless communication interface, wherein during the challenge-response process the microcomputer receives an encrypted value including an access code transmitted from the electronic key, decrypts the received value and compares the received access code with a code stored in the memory of the electronic lock, and unlocks the door of the vending machine if the received access code matches code stored in the memory.
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21. A vending machine comprising:
a door openable to access contents of the vending machine;
an electronic lock for unlocking the door of each vending machine; and an electronic key comprising:
a wireless communication interface for transmitting and receiving communications over a wireless band;
a non-volatile memory having stored therein an access code, and computer executable instructions for performing an encryption operation based on an encryption code; and
an activation device connected to the microcomputer and operable for generating an activation signal for triggering the microcomputer to initiate an access code transmission operation in which the microprocessor performs the encryption operation to encrypt the access code stored in the non-volatile memory, and the wireless communication interface is used to transmit the encrypted access code;
wherein the microcomputer is programmed to perform a bi-directional challenge-response process during a key transmission operation with an electronic lock on a vending machine using encrypted communications through the wireless communication interface; and,
an electronic lock for unlocking the door of the vending machine, the electronic lock comprising a control circuit including a microcomputer, a non-volatile memory, a wireless communication interface for receiving wireless-communications, and a learning mode activation device, the microcomputer being programmed to perform steps of receiving a learning mode activation signal from the learning mode activation device and, in response to the learning mode activation signal, receiving a first access code in an encrypted form via the wireless communication interface, and store the first access code in the non-volatile memory.
22. The vending machine of
23. The vending machine of
a computer having a software program for key management functionality;
a memory containing key management data; and
a key reader communicating with the computer for interfacing the computer with an electronic key;
the software program having computer-executable instructions for performing an key programming operation with the steps of:
retrieving from the memory information of a user of the key and operation limit parameters for said user; and,
sending the operation limit parameters through the key reader to the key for writing into a memory of the key.
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This application is a continuation of co-pending U.S. patent application Ser. No. 10/997,500, filed Nov. 24, 2004, which is a continuation of U.S. patent application Ser. No. 10/329,626, now U.S. Pat. No. 6,900,720, which claims priority of U.S. Provisional Application Ser. No. 60/344,221, filed Dec. 27, 2001.
This application is also related to a co-filed U.S. patent application Serial No. ______, filed on Oct. 19, 2006, having attorney docket number MET-061210, and entitled VENDING MACHINES WITH FIELD-PROGRAMMABLE ELECTRONIC LOCKS.
This invention relates generally to vending machines, and more particularly to vending machines equipped with electronic locks.
Vending machines are widely used in various locations as automated means for selling items such as soft drinks, snacks, etc. Traditional vending machines are equipped with mechanical locks, which can be unlocked with a corresponding mechanical key to open the door of the machine to allow reloading of goods and collection of money.
One significant problem with conventional vending machines is the difficulties in managing the distribution and usage of the keys to ensure the security of the locks on the vending machines. The process of collecting money from the vending machines scattered at different places is a very manpower-intensive operation that requires many employees to go into the field with numerous mechanical keys for operating the locks on the vending machines. It requires a considerable amount of attention and efforts to manage and track the distribution of the keys to the field workers to keep the keys secure.
Moreover, the mechanical keys and lock cores of vending machines are a point of attack for vandals. The keys can be lost or copied easily, and the stolen or copied keys may then be used by an unauthorized person to access the machines, and it is difficult to discover such misuses and security breaches. Also, a skilled vandal can easily pick or drill-out the lock core tumblers and measure the key cuts of the lock core tumblers to re-produce a like key and compromise the security. In the event a security breach is identified, the mechanical lock cores of the affected vending machines typically have to be manually replaced, which is a time-consuming and very costly process. Furthermore, mechanical keys and locks are devices that cannot be partially limited in operation they operate indefinitely if in use. Also, they do not have the ability to record access operation attempts of their operation.
In view of the foregoing, the present invention provides a vending machine with a field-programmable electronic lock. The electronic lock can learn a key code from a corresponding electronic key. Alternatively, the electronic lock can learn that it should be accessed by an electronic switch controlled by a mechanical lock that can be opened with an associated mechanical key. The electronic lock has a learning process activation device that is accessible only when the door of the vending machine is in the open position. Using the learning process activation device, a service person sets the electronic lock in a learning mode, in which the electronic lock receives a key code transmitted from an electronic key, and stores the key code in a non-volatile memory for future access control of the vending machine. In the case where the lock access is to be controlled by the switch-lock combination, during the learning process the electronic lock controller receives an electronic closure signal from the switch. The lock thus learns that it is to open the door of the vending machine in response of the switch signal in lieu of reception of key codes from electronic keys.
The key-learning process in accordance with the invention allows electronic locks in vending machines to be easily and inexpensively programmed in the field. Thus, the electronic locks do not have to be manufactured with pre-defined permanent key codes and are not tied to any specific electronic keys for field use. There is no need to replace any physical part of the electronic lock in this key-learning process to learn a new key code and/or replacing an old key code. In contrast, mechanical locks conventionally used on vending machines have lock cores that have to be manufactured for specific keys, and once manufactured the lock cores cannot be changed. If the mechanical key is lost, the entire lock cores have to be replaced. More than one electronic key can possess a given keycode. The electronic lock on a vending machine can allow more than one keycode to be learned into the lock and used to access the lock.
The use of the field-programmable electronic locks for vending machines provides an effective way to reduce theft and fraud in terms of unauthorized access to the machines. The electronic keys provide a greater level of key security compared to mechanical keys, as they cannot be copied as easily as conventional mechanical keys. The use of non-contact wireless data communication between the key and the lock prevents breeches of security associated with vandals measuring key cuts, copying keys and picking locks. The use of data encryption in the wireless communications between the key and the lock prevents the key code from being copied by electronic monitoring and eavesdropping. The data transmission between the key and lock may be implemented in the infrared range to provide close-proximity highly directional communication of secure codes to further prevent eavesdropping of the security codes and to prevent accidental unlocking of locks.
The use of programmable electronic locks on vending machines and the associated electronic keys also provides advantages in terms of significant reduction in the costs associated with managing the distribution of the keys for unlocking the machines and the monitoring of the usage of the keys. Key IDs in addition to the key codes used in accessing the lock may be used to distinguish keys having the same key codes. Customized access limitations may be programmed by a supervisor into the electronic keys to restrict when and how they can be used to access the vending machines. Each key may also be programmed with a specific list of lock IDs identifying the electronic locks oh vending machines that the key is allowed to unlock.
In accordance with one aspect of the invention, a history of access attempts may be stored in each of the electronic key and the electronic lock for audit purposes. The key may store the access history each time it is used to access an electronic lock on a vending machine. Likewise, each electronic lock on a vending machine may store audit data regarding the access attempts directed to it. The audit data may be transferred from the electronic lock to the electronic key during an unlocking operation, and the audit data of different vending machines collected by an electronic key can be later downloaded to a computer for analysis.
In accordance with another aspect of the invention, the electronic lock may accept more than one type of keys and corresponding key codes. The different key types may be associated with different levels of security of the unlocking operations and the type of data transmitted between the key and lock during the unlocking operations.
In accordance with another aspect of the invention, the electronic lock in a vending machine can work in conjunction with an electronic communication device in the vending machine that is in wireless communication with a home base to accomplish many of the same access control, auditing, and additionally some inventory and money settlement processes.
Referring now to the drawings, the present invention is directed to an electronic lock system for use in vending machines that provides significantly improved security and ease of management over conventional vending machines equipped with mechanical locks. The term “vending machine” as used herein means a device that performs a money transaction, which may involve the insertion of cash or commercial paper, or the swiping of a credit and/or debit card, and may (but not required to) dispense an item or items or provide functions in response to the money transaction. In this regard, this term is meant to cover broadly machines commonly used for vending drinks and snacks, ATM stations, change machines, toll machines, coin-operated laundry machines, video arcades, etc.
The key 26 and the lock preferably communicate with each other wirelessly, which may be via an infrared or radio frequency (RF) channel. In a preferred embodiment, the wireless communications between the key and the lock is via infrared transmissions. The infrared medium is preferred because it is directional and short range, and the infrared circuitry in the lock is not sensitive to the metal cabinet enclosure of the vending machine. Thus the vending machine will less likely be opened accidentally if the key is accidentally operated of if the key is operated to unlock another vending machine nearby. In addition, the infrared light can travel through the selection buttons on the vending machine. This allows the infrared transceiver of the electronic lock to be positioned behind a selection button 30 of the vending machine, as illustrated in FIG. 1. To that end, the vending machine 20 has an infrared transceiver disposed to receive infrared transmission through its front panel 22, and the electronic key 26 has an infrared transceiver at one end 32. As shown in
In accordance with an aspect of the invention, the electronic lock assembly is mounted inside the vending machine 20 to prevent unauthorized access and tampering. It can be physically accessed only when it is properly unlocked and the door 22 or front panel of the vending machine is opened. In one embodiment, as shown in
Turning now to
In an alternative embodiment, the vending machine with the electronic lock is to be accessed using a mechanical key rather than an electronic key. To that end, the electronic lock includes an interface to a combination (the “switch-lock” combination) of an electrical switch 74 and a mechanical lock 76 that has a cam for moving the switch into a closed or open position. The electrical switch 74 is normally in an open state and is closed when the mechanical lock 76 is opened using an associated mechanical key 78. The open/close state of the switch 76 is detected by the microcomputer 50 and is used to determine whether the mechanical lock 76 is opened or closed. T The microcomputer 50 is programmed to unlock the door 22 of the vending machine 20 in response to the closing of the switch contact caused by unlocking of the mechanical lock 76 using the mechanical key 78. Thus, the unlocking process does not involve the passing of a key code between the electronic lock and an electronic key. Accordingly, as described in greater detail below, during a learning process, the electronic lock learns that it is to be accessed using a mechanical key instead of an electronic key with a key code.
As shown in
The key codes in the keys and the locks of the vending machines are used to define the security and access control strategy of the electronic lock system. Each electronic key 26 has a key code 88 stored therein, and the same key code is stored in the memory 52 of the electronic lock in each vending machine to be operated with the electronic key. During each access attempt, the key code in the electronic key is transferred from the key to the electronic lock using a secured communication method. The electronic lock can be unlocked if the key code it receives from the electronic key matches the key code stored in the memory of the lock.
In one implementation as shown in
Similarly, as shown in
In accordance with a feature of the invention, the electronic lock 48 of the vending machine 20 is field-programmable. In other words, the key code or key codes of the electronic lock 48 can be programmed (or “learned”) into the non-volatile memory 52 of the lock after the vending machine has been installed in a given location. In a preferred embodiment, the electronic keys to be used to operate the vending machines are programmed with a permanent key code at the factory and ordered by the users of the electronic locks. In the example given above, the users may order up to 100 keys with the same access code. In contrast, the electronic locks to be used in the vending machines are not programmed with any customer-specific key code. Instead, the electronic locks are programmed with a universal code at the factory. The “universal code” is the code put in the lock by the manufacturer of the lock or the vending machine, and is used by the customers to unpack and open the machines after they receive the machines. Thereafter, the electronic locks are installed in the vending machines, which are then shipped to and set up at their respective operating places. In accordance with the invention, the access control strategy is established by “learning” or transferring the access code of the electronic key to be used to operate the machine into the electronic lock via a secured transfer process.
Referring back to
Once the lock 48 is put in the LEARN mode, the service person operates the electronic key 22 containing the desired key code by pressing the button 36 on the key. This causes the key 22 to transmit the key code stored in its memory to the electronic lock. If the electronic key and the lock employ encryption techniques in their communications, the electronic key 22 first encrypts the key code 88 with the encryption codes 90 in its non-volatile memory and then transmits the encrypted code.
The service person is given a pre-selected timeout period (e.g., 15 seconds) to press the key to transmit the key code. To that end, the lock 48 determines whether it has received the transmitted key code (step 272). If it determines (step 274) that a key code transmission is not received within the timeout period, the learning process is terminated. If a key code has been transmitted within the timeout period, the electronic lock 48 receives the transmitted key code via its receiver port 30. If the transmitted code is encrypted, the electronic lock decrypts the received data with the encryption codes 72 in its memory 52. In a preferred embodiment, the encryption codes in the electronic key and the electronic lock are inserted during manufacturing at the factory, and different encryption codes may be used for different vending machine owners (e.g., different soft drink bottlers) so the keys given to one owner may not be learned into and used to access the vending machines of another owner.
If the encryption codes of the key and the lock do not match, the electronic lock will not be able to successfully decrypt the received key code. In that case, the process will end and the lock will not learn the new key code. If, however, the decryption was successful, the lock stores the key code at a proper location in its non-volatile memory 52 according to its key type (step 276). After verifying that the key code is stored correctly in the proper key type location, the lock 48 provides a signal to the service person by flashing the LED 64 to indicate that the LEARN process is successfully completed (step 278). From this point forward, the electronic lock will use the newly learned key code for access control. In other words, it will compare this key code with the key code transmitted from an electronic key to determine whether the door should be unlocked. If there was a key code of the same key type previously stored in the memory 52 prior to the LEARN operation, that old key code will be erased and can no longer be used to access the vending machine.
As mentioned above, in an alternative embodiment, the vending machine equipped with the electronic lock may be accessed with a mechanical key rather than an electronic key. The electronic lock learns that it is to be controlled by the combination of the electrical switch 74 and the mechanical lock in a learning process similar to the one for learning a key code as described above. Specifically, to enable the lock access via the switch-lock, the service person puts the electronic lock into the learn mode by pressing the LEARN switch 62 as described above. Once the electronic lock 48 is in the learn mode, the service person uses the mechanical key 76 to unlock the mechanical lock 76. When the mechanical lock 76 is moved to its unlocked position, its cam closes the contact of the electrical switch 74. The microcomputer 50 of the electronic lock receives the contact-closure signal (i.e., detecting that the electrical switch is closed) and treats the signal as indication that the vending machine is to be accessed using a mechanical key. In response, the microcomputer set its operation mode such that in the future it will unlock the door of the vending machine in response to detecting the closure of the contact of the electrical switch 74. Thus, from this point forward, the vending machine is accessed using the mechanical key 78, which replaces one or more types of electronic keys.
It will be appreciated that the key learning process described above does not require changing or replacing any physical components of the lock. If the electronic key for operating the lock on the vending machine is stolen or lost, the service person will first use a back-up key that has the key code of the key that is lost, or a key that has a different key code that has been previously learned into the lock, to open the door. The service person then uses the key learning process described above to change the key code in the memory of the lock to a new value. This field-programmability of the electronic lock makes key management significantly easier and cost-effective, and provides a greater level of key security compared to mechanical keys. In contrast, with conventional vending machines using mechanical locks, the mechanical keys may be copied or stolen easily, and the entire lock core of each of the vending machines affected has to be replaced in order to change to a different key.
In the illustrated embodiment, one digit in each key code stored in the lock indicates the type of the key, and there may be up to ten different key types. A lock is able to learn one key code for each allowed key type. A key code of a first type may be that learned from a “primary” electronic key for the vending machine, while a key code of a second type may correspond to a different electronic key, such as a “master” key that can be used as a back-up in case the primary key is lost, stolen, broken, or otherwise unavailable.
In a preferred embodiment, as briefly mentioned above, different types of electronic keys (indicated by the different values of the key type digit) are provided that correspond to different levels of security (and the associated complexity of communication) and audit data collection function. The three types of electronic keys are economy key, standard key, switch-lock, and auto-tracking key. The operation of each of these three types of keys is described below.
In comparison with the economy key, the standard key provides a more secure unlocking process that requires 2-way encrypted communications between the key and the electronic lock. The 2-way communications is in the form of a bi-directional challenge-response process. Referring to
If the two key codes match, the process continues and enters a second phase in which the electronic lock transmits data to the electronic key. Specifically, the lock encrypts (step 164) the key code, the lock ID 146, and the random number. It then transmits the encrypted key code, lock ID, and the random number (originally sent by the key) to the electronic key. The electronic key receives the encrypted data 166 and decrypts (step 168) the data to retrieve the key code and the lock ID. If the key determines (step 172) that the key code 170 returned by the lock matches the key code 132 in the memory of the key, it stores data regarding the access event, including the lock ID, in an audit trail data portion of the key's memory for audit purposes.
The key then proceeds to the third phase of the unlocking process, in which the key communicates to the lock to allow access. To that end, the key encrypts (step 176) the received lock ID and transmits the encrypted lock ID and random number to the lock. The lock receives the transmitted data 180 and decrypts (step 182) the data to retrieve the lock ID. If the received lock ID 186 matches the lock ID 146 stored in the memory of the lock, the microcomputer of the lock proceeds to unlock the door of the vending machine.
The unlocking operation described above has several advantages. It allows the transfer of the lock ID and the key codes between the electronic key and the lock on the vending machine without repeating numbers or a distinguishable pattern of numbers in case of eavesdropping of repeated access attempts. It also prevents a transfer of data between the key and the lock with different encryption codes. Further, it provides a consistent and secure means of data transfer between the key and the lock for a condition where many keys with the same key code will be expected to communicate with many locks on different vending machines containing that key code. This bi-directional challenge-response encryption scheme provides no risk of the keys and the locks going out of sequence, which is a common problem with unidirectional rolling-code encryption systems.
The lock ID code is used in the unlocking operation described above for generating audit data for audit trail identification purposes and also for data transfer encryption purposes. In an alternative embodiment, however, it is also be used to provide a method for controlling which vending machines a key is allowed to access. In this method, there may be many keys containing the same key code, and there may be many vending machines that have “learned” the same key code. It is possible, however, to specify which vending machines a given key is allowed to access so that a single key cannot open all the vending machines. Referring to
In an alternative embodiment, an electronic key may also be programmed with other types of limits of operation of the key. For instance, the key may be programmed with limit registers that contain values chosen by a supervisor to limit the operation of that particular key. In a preferred embodiment, the limit registers 200 (
In accordance with an aspect and alternative embodiment of the invention, an advantage of electronic keys is that they can be used to record and collect and track the attempted accesses of locks on vending machines in the field. Keys that provide this function are of the “auto-tracking” type mentioned above. Referring to
If the access attempt results in a key code mismatch or if the key is disallowed for access because an operation limit in its limit registers is reached, the access process is terminates. In either case, the lock transfers its lock ID 228 to the key 212. The key is expected to store the lock ID and the timestamp in its audit data memory as an invalid access attempt.
If, on the other hand, the access attempt results in a valid match of key code and the key has not exceeded its operation limits, the lock still transfers its lock ID to the key 212. The key 212 then stores the lock ID and timestamp in the audit data memory as a record of a proper access. In addition, as the electronic key is an auto-tracking key, the lock transfers all the audit data 228 entries in its audit data memory to the key. The data in the audit data memory includes the lock ID, a record for each access attempt that includes the entire key code (including the key ID digits) received from the key that made the access attempt, and the timestamp for that access attempt. The auto-tracking key 212 then stores the audit data 228 of the lock in its own non-volatile memory. In this regard, each key preferably is capable of uploading the audit data memories of 200-300 vending machines. This eliminates the need for a separate process or equipment in the field for performing the same data retrieving function.
When the electronic keys 212 are returned to the home base, the audit data they generated themselves and the audit data they collected from the vending machines 20 can be transferred to a central control computer 210. The audit data can be downloaded to the PC 210 by the supervisor using the key read/write device 218 that is also used for programming the electronic key.
By way of example,
Due to the various complexities of this system concerning multiple key users, key codes, and the multiple keys sharing the same key codes, as well as the flexibility provided by the ease of changing access codes of the vending machines in the field, it is often desirable to provide simple diagnostic capabilities to the keys, electronic locks. It may also be desirable to provide special reader tools for use in the field.
In one implementation, the electronic key uses its LED light to provides several diagnostic signals to the user when its START button is pressed and when it is communicating with the electronic lock. If the key correctly communicates with the lock and the key codes match, the LED light is on continuously for about five seconds. If the key correctly communicates with the lock but the key codes do not match, the LED light flashes around five times a second for about five seconds. If the key cannot establish correct communication with the lock, the LED light is set to flash faster, such as 25 times a second, for about five seconds. If the key correctly communicates with the lock and the key codes match, but the operation limits set in the limit registers are exceeded, the LED flashes at a lower frequency, such as three times per second for about 3 seconds. If the START switch of the key is pressed and the key does not communicate with the lock and its operation limits are exceeded, the LED first flash quickly, such as 25 times per second, for up to 5 seconds, and then flash three time per second for up to three seconds.
In a preferred embodiment, a diagnostic tool 240 is used in the field to communicate with electronic locks on vending machines, which provide diagnostic information in the event of problems with the operation of the lock or the door. As shown in
In a preferred embodiment, security measures are implemented in the electronic key concerning key tampering by replacing the battery in the key. It is possible that the employees or thieves that gain access to the electronic keys will attempt to trick the security of the system by tampering with the key. Since the key contains the clock that provides the time and date of access limiting, it is likely the users will attempt to disable or trick the clock to override the access limits. For example, if the key operation limits are set to only allow accesses between 7 AM and 6 PM, the user may attempt to disconnect the battery of the key in-between lock accesses to stop the clock in the key from counting down the time and disabling the key.
In addition to the time-restoration feature, the microcomputer 80 in the key employs logic that counts the number of times the battery is removed and will immediately disable the key indefinitely if the battery is disconnected and re-connected more than a pre-selected number of times, such as three times. Specifically, the microprocessor maintains in the non-volatile memory 82 a counter 312 that counts the number of times the key has been powered up since the last docking of the key. This counter 312 is cleared each time the key is docked. Each time a battery is inserted in the key and the microcomputer 80 goes through the power-up process (step 306), the microcomputer 80 reads the counter 302 (step 316). If the microcomputer determines (step 318) that the counter reading has reached the allowed number of power-up, such as 3 times, it disables the key from any access operation. If the allowed number of power-up is not reached, the microcomputer increments the counter (step 320). Thereafter, the key continues with regular key operation, but with each access attempt the key will store a “battery removed” bit with the audit data for that access event in the memories of the lock and the key. This “battery removed” bit indicates that the time and date stamp of the access event is recorded after the key battery was disconnected, and that the accuracy of the time and date is questionable.
Moreover, the communication device 360 may be used with the vendor control 362 to keep track of the inventory and the cash transactions of the machine. In many cases, when the service person (route driver) visits the machine, his job is to fill the machine and collect money. During this task, the vendor control 362 is involved in interfacing with the service person to ensure the proper resetting and settlement processes take place, and that the service person closes the door of the vending machine. The vendor controller 362 can inform the home base computer of the open/close state of the vending machine door. In the case the Route Driver does not satisfy the conditions of the vendor controller 362 by way of inventory or monetary or debit card processing, the vendor controller can send a disable signal to the electronic lock 48 so the door of the vending machine cannot be closed and locked. Thus, since the service person cannot leave a vendor unlocked, this process would force him to complete the required resetting and settlement processes so the vendor controller can allow the vendor door to be locked before the service person leaves the vending machine.
Referring now to
In view of the many possible embodiments to which the principles of this invention may be applied, it should be recognized that the embodiments described herein with respect to the drawing figures are meant to be illustrative only and should not be taken as limiting the scope of the invention. Therefore, the invention as described herein contemplates all such embodiments as may come within the scope of the following claims and equivalents thereof.