The invention generally pertains to electronically operated locks, and more particularly to an electronic barrel lock and key system (system) that utilizes a coded electrical signal from the key to open the lock.
Electronic locks operate by means of electric current that is typically supplied by a lock-internal battery. The battery is activated when a key is inserted into the lock's keyway or by a code that is entered into a lock-attached keypad. In either design, keys can be added and removed without re-keying the lock cylinder. The locks unlocking mechanism can be designed to utilize a magnetic force, a solenoid or a motor to activate the lock by either supplying or removing the electrical current. The prior art electronic locks have inherent problems that include: complexity, large dimensions, maintenance and reliability.
The problems with the prior art electronic locks are solved by the instant invention by utilizing an electronic lock having a flush face with no keyway, no internal power source and that is impervious to moisture, dust, dirt and debris. The inventive electronic lock lies dormant and can only be activated when a registered electronic communication device makes contact with the lock.
A search of the prior art did not disclose any literature or patents that read directly on the claims of the instant invention. However, the following U.S. patents are considered related:
The U.S. Pat. No. 6,474,122 patent discloses in a first design, an electronic lock having interchangeable core locks. The core lock has a solenoid assembly that is longitudinally aligned parallel to the rotational axis of the cylinder lock. In a second design an electronic lock has a ferromagnetic enclosure that surrounds at least a portion of a solenoid assembly when the cylinder of the lock is free to rotate.
The U.S. Pat. No. 7,690,231 patent discloses an electromechanical cylinder lock that includes an outer lock shell and a rotatable lock barrel which is controlled by dual locking features. A side bar selectively locks and permits rotation of the barrel in response to insertion of a key into a keyway in the barrel. A slider bar is movable between a blocking position in which the side bar is prevented from permitting rotation of the barrel, and an unblocking position in which the side bar permits rotation of the barrel.
The U.S. 2009/0013736 publication discloses an electronic lock having a body, a barrel having a slot, a pin disposed in the slot, a blocking member disposed in the body to prevent movement of the pin, and an electro-mechanical device. Activation of the elector-mechanical device causes the blocking member to be moved clear of the pin and movement of the barrel causes the pin to be moved out of the slot.
For background purposes and indicative of the art to which the invention relates, reference may be made to the following remaining patents found in the patent search.
The electronic barrel-lock and key system (system) is designed to provide a tamperproof electronic lock that is opened by an electronic communication device. The system is comprised of an electronic master key, an electronic standard key and an electronic programming module that interfaces with an electronic barrel lock.
The master key which can have restrictions can open any of the system's electronic locks. The standard key can also be restricted to open for a set number of days.
The programming module cannot open a lock, it is designed to only program or reprogram a lock. The programming module is programmed by connecting the module to a computer. The program in the computer is then down loaded to an electronic circuit located inside the programming module. The output of the programmed module connects to the lock with a single wire that is attached to a non-keyed plate that interfaces with a non-keyed plate on the lock. The programming module is a self-contained hand-held device which can be disconnected from the computer and carried to a remote location where a lock can be programmed or reprogrammed. The computer is comprised of a standard computer that operates with a proprietary software that is designed to program or reprogram the two keys and the programming module
A unique feature of the system is that both the key and the lock codes can be changed periodically and the key can be rendered inoperative after a given time frame loaded by the program. Additionally, the key can also be programmed to work for a set number of days.
Another unique feature of the system is that both the electronic lock and the electronic communication devices use a single contact that interfaces with a non-rotating non-keyed interface on the electronic lock. Both power and signal are sent over the single contact. Other electronic locks on the market use three or more contacts in the connector. Power and signal are sent over separate lines and use multiple pin contacts to achieve this. Having a single contact to transfer both power and signal makes the connector more reliable.
The electronic lock comprises an elongated body having an outer surface, a first end and a second end, with a lock head attached to the first end, and at least one ball located within an opening located adjacent to the body's second end. Located within the body are functional elements including a printed circuit board, a power wire, a memory wire, bobbins, a spring, a steel ring, a low-melt alloy and a wire anchor.
The memory wire is designed to shrink when external heat is applied to the lock. In order to provide security to prevent external heat being applied to open the lock, the low-melt alloy, which is located within the lock's body, is utilized. The alloy is designed to melt at a lower temperature than it would take to cause the memory wire to shrink from the external heat source.
In the event that the low melt alloy does melt, the lock becomes totally disabled. The lock would have to be cut off to remove it. This would also make it obvious that someone was tampering with the lock providing a good reason to increase security.
The lock functions as follows: when a key is connected to the lock both power and data is sent from the key to the lock. Both pass the power and data through a reverse polarity protection circuit and an overvoltage protection circuit and out to the remaining circuit elements.
The power and data from the key is applied to a voltage regulator, a data out circuit and to a microcontroller. When the microcontroller receives power from the key it goes through a power start-up program, which resets the microcontroller and starts the program. First it reads the data from the data-in circuit and compares the incoming code with the code stored in the microcontroller memory. If the key code coming in matches the lock code in memory and meets any other programmed criteria the microcontroller:
1. sends a signal back to the key via the data-out circuit and to a microcontroller located in the key. The microcontroller in the key then flashes a green LED to let the user know that the codes match and the lock is open.
2. outputs a signal to an electronic switch that allows current to pass through the power wire which causes the memory wire to heat and shrink, thereby allowing the lock to open.
If the key code applied to the lock does not match, the following occurs:
1. the electronic switch is not activated preventing the lock from opening, and
2. the microcontroller then sends a signal back to the key through the data-out circuit and back to the key. This code is read by the microcontroller in the key causing a red LED in the key to flash indicating that the codes do not match and the lock will not open.
Under normal operating conditions power to the key circuit is supplied by a battery. However, during the programming process, when the key is connected to the computer, power is supplied to the key and the battery is disconnected electronically by the normally closed (NC) electronic switch. Under normal operating conditions the NC switch allows power from the battery to pass through the switch to an output line.
When programming the key, a connector is applied to the NC switch. This opens the switch and disconnects the battery from the circuit. Power for the circuit is now routed to the input of a voltage regulator. The output of the voltage regulator is applied to the microcontroller, a real time clock and to a fuel gauge.
A fuel gauge monitors the clock battery. When the battery runs down, the fuel gauge sends a signal to the microcontroller, which alerts the microcontroller that the battery is getting weak. The microcontroller then sends a signal out to either or both an audio alarm and to a LED, and alerts the user that the lock battery is weak and needs to be replaced or recharged. The battery voltage travels through the reverse battery protection circuit through the switch and to the power control switch.
In view of the above disclosure, the primary object of the invention is to provide an electronic barrel lock and key system that utilizes a coded electrical signal that passes through a concentric non-rotating non-keyed interface between the key and the lock.
In addition to the primary object of the invention it is also an object of the invention to provide an electronic barrel lock and key system that:
has no key slot and therefore cannot be picked,
can withstand salt air or salt water exposure,
cannot be opened when exposed to a magnetic force,
is durable and can withstand abuse,
can be utilized for a variety of lock structures including a ring lock, a padlock, a cabinet, a file cabinet or a display case,
has a built-in security feature that places the lock in a permanently locked state when an attempt to open the lock by applying high temperature, and
is cost effective from both a manufacturer's and consumer's point of view.
These and other objects and advantages of the present invention will become apparent from the subsequent detailed description of the preferred embodiment and the appended claims taken in conjunction with the accompanying drawings.
The best mode for carrying out the invention is presented in terms that disclose a preferred embodiment of an electronic barrel lock and key system (system) 10 that is designed to produce a reliable and tamper-proof electronic lock and key system. The system 10, as shown in
The computer 200 utilizes a proprietary software 202 that includes an encrypted code that allows the system 10 to be operated by means of the electronic communication devices and programming module. The software program 202 is further comprised of a first program that operates the electronic communication device 12, the standard key 14, and a second program that operates the programming module 16. Additionally, each program has a unique graphic user interface (GUI).
The electronic programming module 16, as shown in
The master key 12, the standard key 14, and the programming module 16 can utilize a common structural design 28, as shown in
The lower section 22 has an upper surface 24 and a lower surface 26 with the upper surface 24 having a front cavity 30 that has attached a printed circuit board (PCB) 32. The PCB includes the elements that comprise the key and module electronic circuit 18. The upper surface 24 further has a battery containment cavity 34. The central frame 40 has a rear battery gripping structure that grips a battery B1. The frame 40 also has a front section 46 that clamps onto a spring-biased single pin rod 48 that extends outward and that interfaces with a collet assembly 50, as shown in
The two electronic communication devices 12 and the programming module 16 utilize a common electronic circuit 18, as shown in
The electronic circuit 18, as shown in
The EEPROM E1 is connected to an input/output BDB on the microcontroller U1.
The real time clock RTC R1 has an input I1 connected to a clock battery B2 and to VDD on the microcontroller U1, and an output 01 connected to 9A on the microcontroller U1,
The RTC fuel gauge FG has an input connected to VDD on the microcontroller U1 and an output 01 connected to 7 on the microcontroller U1. The audio alarm AA has an input I1 applied from 6 on the microcontroller U1.
The bi-color LED LD1 has an input I1 connected to pin 5 on the microcontroller U1. The momentary switch S1 has an output 01 applied to 4 on the microcontroller U1.
The battery B1 has a positive output + connected to the input I1 of a reverse battery protection circuit RV1 having an output V1 connected to the power control switch P1 and to a normally closed NC electronic switch S1 connected to the voltage regulator Vr.
The power control switch P1 has an input V1 that is applied from the reverse battery protector RV1 and an output V3. The NC electronic switch S1 also has an input A1 applied from the USB interface connector USB1, an input V1 applied from the reverse battery protection circuit RV1, and an output V2,
The voltage regulator Vr has an input V2 applied from the NC electronic switch S1, and an output 01 connected to VDD and to P on the microcontroller U1. The overcurrent protection circuit OP has an input V3 and an output DO, wherein the input is applied the signal V3 from the power control switch P1.
The data-out circuit D0 has an input I1 and an output D1, wherein the input I1 is applied from 2 on the microcontroller U1. The data-in circuit D1 has an input I1 and an input 4A, wherein the input I1 is applied from pin 3 on the microcontroller U1, and the input 4A is connected to the output D0 which produces encoded data from the electronic lock.
The lock electronic circuit 19, as shown in
The reverse polarity protection circuit RPP is applied the data-in signal A from the electronic communication device and produces an output signal 01. The output signal 01 is applied to the over voltage protection circuit OVP which produces a signal C that is applied to H on the electronic switch S2 and to the input V1 on the voltage regulator Vr where the voltage is regulated to 3.9 volts d-c and applied as a signal VDD to the data-in circuit Din and to MP on the microcontroller U2. The microcontroller U2 is also applied an input D from output 01 on the data-in circuit Din. The microcontroller U2 also produces an output F that is applied to the electronic switch S2 and an output E that is applied to the input I1 on the data-out circuit Dout. The electronic switch S2 has a connection G that is applied to circuit ground.
The electronic barrel lock 66, as shown in
a) insulation 96,
b) a non-keyed plate 98,
c) at least one insulation clip 100,
d) an electrical contact 102 that extends from the printed circuit board (PCB) 104 that is attached to a PCB support 106, wherein attached to an extending from the PCB 104 is a power wire 108,
e) a first bobbin 112 having a first end 114 and a second end 116 wherein the PCB support 106 is attached to the first bobbin's first end 114,
f) a length of nickel titanium memory wire 120 having a first end 122 and a second end 124, wherein the first end 122 is attached to the second end 116 of the first bobbin 112,
g) a spring 126,
h) a second bobbin 128 having a first end 130 and a second end 132, wherein the second end 124 of the memory wire 120 is attached to the first end 130 of the second bobbin 128, wherein the spring 126 is located between the first bobbin 112 and the second bobbin 128, and the power wire 108 and memory wire 120 pass through the spring 126,
i) a washer 134 that interfaces with the second end 132 of the second bobbin 128,
j) a steel ring 138 having a first end 140 and a second end 142 wherein the first end interfaces with the washer 134, wherein directly below the steel ring 138 is an inward-extending ledge 144 within the body 70, wherein directly below the ledge 144 are the openings 92 and the balls 94,
k) a low-melt alloy 150 having a first end 152 and a second end 154, wherein the first end 152 is attached to the second end 142 of the steel ring 138,
l) an insulated wire anchor 156 having a first end 158 and a second end 160 that is attached to the first end 158 of the anchor 156, and located within the anchor, adjacent the second end 160, is a metal insert 162. The power wire 108 that is attached to the PCB 104 extends along elements f)-k), passes into the anchor 156 and is attached to the metal insert 162 which secures the power wire 108 and functions as a ground for the power wire 108. When the lock 66 is in a locked state, the steel ring 138 applies pressure onto the at least one ball 94, thereby causing the ball 94 to extend outward from the body's outer surface 72. When the ball 94 is fully extended, a portion of the ball's radius that is extended is blocked by an internal member of a lock receiving strtucture, thereby precluding the lock 66 from being extracted. The barrel lock 66 is unlocked when one of the keys 12,14 interfaces with the lock's non-rotating non-keyed interface 88, as shown in
There is no power within the lock 66, thereby allowing the lock 66 to remain in a dormant state until one of the keys 12,14 is activated. The activation occurs when the key 12,14 and the lock 66 interface, which allows power to pass from the key 12,14 to the PCB 18 located within the lock 66. The key 12,14 also includes PCB 32 which is shown along with other internal elements in
As previously disclosed, the operation of the lock 66 results from the heating of the memory wire 120. It is important to note that external heating of the lock 66 will not cause the memory wire 120 to contract.
The low-melt alloy 150, as best shown in
The benefits of the system 10 are that the number of moving parts are kept to a minimum, which reduces manufacturing costs and ensures that the reliability of the system 10 is high. The use of the system 10 is relatively simple as there is no orientation of the key 12,14 into a keyway as the system 10 key head and lock face are concentric; there is no keyway that can be blocked or utilized as a torque point to pry open the lock 66, picked, or opened with a magnet. Additionally, there are more than four billion code combinations that can be programmed into the key 12,14 in order to open the lock 66. The lock 66 is hermetically sealed which makes it impervious to dust, dirt or moisture. Additionally, the lock 66 is waterproof and will function after being submerged, even for extended periods of time, in both regular water or salt water.
The key 12,14 can also be programmed to open any number of locks, thereby allowing master keying. if necessary, the lock 66 can be re-programmed in the field. The key 12,14 can include a built-in timer so if an employee of a company were to steal or lose a key, any potential resulting problems would diminish, as the key would “time-out” and automatically turn off, thus rendering the key 12,14 useless until it is re-programmed. The system 10 can be used with a variety of lock receiving structures, including a ring lock 210, as shown in
While the invention has been described in detail and pictorially shown in the accompanying drawings it is not to be limited to such details, since many changes and modifications may be made to the invention without departing from the spirit and the scope thereof. Hence, it is described to cover any and all modifications and forms which may come within the language and scope of the claims.
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