Abstract:
A anti-theft system is provided which prevents a vehicle equipped with the system from being driven away more than a predetermined distance. The system includes a first electronic control device which is mounted in the vehicle which control continued operation of the vehicle after the vehicle is started, e.g., controls opening of the ignition or fuel injection circuits. A second electronic control device, adapted to be worn by a person authorized to use the vehicle, receives a characteristic signal from the first device and transmits a return signal in response thereto. A control circuit of the first device calculates the distance between the two devices based on the returned signal and disables vehicle operation when the distance is greater than the predetermined distance.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims benefit of U.S. Provisional Application No. 60/465,494, filed Apr. 25, 2003. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to devices and systems for preventing unauthorized use of a motor vehicle and, more particularly, to an anti-theft device or system which automatically disables the vehicle under certain conditions to prevent the vehicle from being driven away and, in a preferred embodiment, to prevent use of the vehicle equipment. 
     BACKGROUND OF THE INVENTION 
     Although it will be understood that the present invention is not limited to such an application, one important application of the invention is in the field of emergency response vehicles such as police cars. The theft rate of such vehicles is on the increase and the potential use of such stolen vehicles in terrorist activities is a dangerous prospect particularly because people tend to accept the legitimacy of the presence of such vehicles at sites where ordinary vehicles would raise suspicions. 
     Another aspect of the problem is that police cars and other emergency vehicles are often left running or left with the ignition key in while the policeman or other emergency response personnel tends to whatever task is at hand. For example, the police may temporarily leave a police car running or the keys in the car or otherwise unsecured when investigating an incident on the side of a highway or in another situation where only a quick stop is made. Further, criminals, terrorists or others may simply break into the car and “hot wire” the car or effect other starting thereof to enable the car to be driven off and may also use the equipment in the car (radio, guns from the gun rack, etc.) for their own purposes. 
     Although various devices have been developed for protecting against the unauthorized use of vehicles including emergency and public works vehicles, these have proved to be of limited effectiveness in some situations particularly where the criminal or terrorist is highly motivated or otherwise determined to break in and drive off the vehicle. 
     SUMMARY OF THE INVENTION 
     In accordance with the invention, there is provided an anti-theft device or system for preventing a protected vehicle from being driven away. In the latter regard, it should be understood that the system of the invention is not designed to prevent and does not prevent an initial taking of the vehicle but rather prevents the vehicle from being driven away more than a predetermined distance (which is typically set to be from 10 feet to one-half mile). Thus, the system of the invention prevents loss of property and even loss of life. For example, the system of the invention, when used correctly, ensures that the protected vehicle will never to be involved in a high-speed chase that could potentially claim innocent lives. 
     An important advantage of the basic system of the invention is that the system is completely automatic, i.e., there are no buttons to push, no codes to remember and nothing to be done to activate the system or reactivate the system. As discussed below, the authorized driver of the vehicle simply wears one part of the system, referred to as the “reflector,” and this part is preferably disguised as an ordinary pager or like electronic unit. 
     In accordance with one aspect of the invention, there is provided an anti-theft system for vehicles, the system comprising: 
     a first electronic control device, adapted to be mounted in a vehicle to be protected, for controlling continued operation of the vehicle after the vehicle is started, said first control device including a transmitter/receiver for, when the system is active, transmitting a characteristic signal; and 
     a second electronic control device adapted to be worn by a person authorized to use the vehicle and including a transmitter/receiver for receiving said characteristic signal and for transmitting a return signal to the transmitter/receiver of the first control device in response thereto; 
     said first electronic control device including a control circuit for calculating the distance between the first and second control devices based on the returned signal and for disabling vehicle operation when said distance is greater than a predetermined distance. 
     Preferably, the control circuit includes a relay, including relay contacts connected in the electrical system of the vehicle, for, when energized, opening said contacts to open the vehicle electrical system. In one important embodiment, the electrical system includes an ignition circuit and the relay contacts are connected in the ignition circuit to control disconnection of the ignition circuit. In another important embodiment, the electrical system includes a fuel injector control circuit and the relay contacts are connected in the fuel injector control circuit so as to control operation of the vehicle fuel injectors. In yet another important embodiment, the electrical system comprises a power supply circuit for the fuel supply system of the vehicle and the relay contacts control opening of said power supply circuit. 
     Preferably, the second control device includes emergency shutoff means operable by the wearer of the second control device for, when activated, causing transmission of a cutoff signal to said first control device to effect cutoff of the vehicle operation. 
     In an advantageous implementation, the second control device includes a battery-powered power supply having a predetermined operational lifetime and monitoring means for monitoring the hours of use of the power supply and for producing an alarm output when the hours of use approach the predetermined lifetime. 
     Preferably, the control circuit automatically resets the system to enable vehicle operation if the distance between the first control device on the vehicle and the second control device becomes less than said predetermined distance. 
     The second control device preferably includes control means operable by the wearer of the second control device for, when activated, disabling, after passage of a predetermined time period, the vehicle and all vehicle power options. 
     Advantageously, the system further includes an override function operable by the wearer of the second control device to enable operation of the vehicle when in park, the system providing for automatic disabling of at least one vehicle function when the vehicle is taken out of park and the vehicle is more than said predetermined distance from the second control device. 
     Preferably, the control circuit further includes control means, remotely operable by the wearer of the second control device, for disabling at least one further electrically controlled onboard device when the vehicle operation is disabled. The at least one onboard device advantageously comprises at least one of vehicle communication equipment, a siren, an onboard computer and an electrically operated gun rack. 
     Preferably, the control circuit includes control means, remotely operable by the wearer of the second control device, for enabling at least one electrically controlled onboard device when the vehicle operation is enabled. The at least one onboard device comprises at least one of emergency light bars, an emergency signaling device, a camera system, and a recording device. 
     Advantageously, the characteristic signal and return signal both comprise radio signals. 
     In a preferred implementation the second control device is of a size and an outward appearance similar to that of a conventional pager device. 
     In accordance with a further aspect of the invention, there is provided a system for preventing a vehicle protected by the system from being driven away by unauthorized persons, the system comprising: 
     a first electronic control device, adapted to be mounted in a vehicle to be protected, for controlling continued operation of the vehicle after the vehicle is started, said first control device including a transmitter/receiver for transmitting a characteristic radio frequency signal; and 
     a second electronic control device adapted to be worn by a person authorized to use the vehicle to be protected and including a transmitter/receiver for receiving said characteristic signal and for, in response thereto, immediately transmitting a return radio frequency signal to the transmitter/receiver of the first control device; 
     said first electronic control device including a control circuit for calculating the distance between the first and second control devices based on the returned signal and for disabling vehicle operation when said distance is greater than a predetermined distance, the control circuit also disabling vehicle operation when a return signal is not received from the second control device. 
     As above, the control circuit includes a relay, including relay contacts connected in the electrical system of the vehicle, for, when energized, opening the contacts to open the vehicle electrical system. Also as above, in different, important embodiments, the electrical system includes an ignition circuit and the relay contacts are connected in the ignition circuit to control disconnection of the ignition circuit, the electrical system includes fuel injector control circuit and the relay contacts are connected in the fuel injector control circuit so as to control operation of the vehicle fuel injectors, and/or the electrical system includes a power supply circuit for the fuel supply system of the vehicle and the relay contacts control opening of the power supply circuit. 
     Further features and advantages of the present invention will be set forth in, or apparent from, the detailed description of preferred embodiments thereof which follows 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic cross-sectional view of a first control device of the system of the invention, which is, in use, mounted in the protected vehicle and which is constructed in accordance with a preferred embodiment; 
         FIG. 2  is a schematic cross-sectional view of a second device of the system of the invention, which is, in use, adapted to be worn by an authorized user of the protected vehicle and which is constructed in accordance with a preferred embodiment; 
         FIGS. 3(   a ) and  3 ( b ) are schematic circuit diagrams of one preferred embodiment of a transmitter that can be employed by the present invention; and 
         FIGS. 4(   a ),  4 ( b ),  4 ( c ),  4 ( d ),  4 ( e ) and  4 ( f ) are schematic circuit diagrams of one preferred embodiment of a receiver that can be employed by the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIG. 1 , there is shown a schematic block form representation of the first electronic control device or unit, which is generally denoted  10 . Control unit  10  includes a transmitter/receiver circuit board  12  including a programmed control chip  14 , and is connected to an antenna  16 . 
     The transmitter/receiver circuit  12  is powered from the vehicle power supply and, in this regard, is connected by a wire or other connection  18  to the vehicle power supply (typically 12 volts) and by a wire or other connection  20  to the vehicle ground denoted  22 . 
     Transmitter/receiver circuit  12  is further connected to a relay  24  which is, in this embodiment, connected in the ignition circuit (not shown) between the vehicle ignition power supply connection  26  and the vehicle ignition coil connection  28 . As indicated above, a relay corresponding to relay  24  can also be used in other vehicle electrical circuits such as the fuel injector control circuit, which, when open-circuited responsive to opening of the contacts  24   a  of relay  24 , cause vehicle operation to be disabled or terminated. 
     All of the electronic control circuitry described above is housed in a case or housing  30  of unit  10  which is, in use, mounted within the vehicle to be protected at a suitable location. 
     Referring to  FIG. 2 , a second electronic control device or unit, also referred to herein as a “reflector,” is indicated at  32 . Unit  32  includes a control switch  34  including on, off and test positions, a transmitter/receiver circuit board  36  and an associated antenna  38 , and a portable power supply  40  preferably comprising a pair of batteries or the like. The unit  32  includes a case or housing  42  which is designed to be worn on the belt of a user and is disguised to have the appearance of an ordinary pager or like electronic device. In other words, housing  42  is of a size, shape and outward appearance of an ordinary pager or like device so as to be normally undetectable as a control device. 
     The transmitter  12  of main unit  10  is used to transmit a characteristic signal preferably in the form of a radio frequency “ping” or pulse transmitted at equally spaced, timed intervals. This signal is received by the receiver  36  of the second, “reflector” unit  32  which processes the received signal and transmits a return signal back to the first control unit  10 . The control chip  14  of unit  12  processes the return signal and, based thereon, calculates the distance between the units  12  and  32  and thus distance between the vehicle and the wearer of the second, “reflector” unit  32 . The chip  14  also determines whether this distance is greater than a preset or predetermined distance which, as indicated above, is typically set to be a distance from about 10 feet to about one-half mile. If the present distance is exceeded, a control signal is produced which causes the relay contacts  24   a  of relay  24  to open, thus opening the connection between the vehicle power source (connector  28 ) and the vehicle ignition circuit (connector  26 ) to thereby disable the vehicle. 
     It is noted that if return signal is not received by the transmitter/receiver  12 , this will be treated in the same way as a signal indicating the exceeding of the preset distance, and control chip  14  will cause relay  24  to open under this condition as well. 
     In one embodiment of transmitter/receiver  12 , when a companion transmitter/receiver  36  is in range, transmitter/receiver  12  is in an operational mode such that any electrical circuits controlled thereby function as usual. If the signals from transmitter/receiver  36  can no longer be heard by transmitter/receiver  12 , internal relays, corresponding to relay  24 , are triggered, thereby controlling the aforementioned electrical circuits. The receiver  12  includes jumper selectable settings (not shown) for setting the transmitter reporting interval, i.e., setting the maximum time that the receiver  12  must wait until receiver  12  hears from companion transmitter  36  before receiver  12  triggers relay(s)  24 . If receiver  12  receives a signal during this interval, an internal counter (not shown) is reset, thereby starting a new period. The receiver  12  is programmed so as to listen to only one specific transmitter. When the transmitter signal is received, i.e., when receiver  12  hears from transmitter  36 , the received message is processed to determine if particular bits in the message have been set. If so, the relay(s)  24  are triggered. This mode of operation occurs in response to an “activate now” or “panic” mode of the transmitter  36  described below. As is discussed in more detail below, this switch-controlled mode is used in emergency conditions to disable the vehicle. 
     As explained above, a relay or like switching device actuated by control chip  14  can be used in other ways to disable the vehicle after the separation distance exceeds the present distance including, inter alia, disabling the fuel injectors, disabling the fuel power supply or disabling any other function that will result in terminating or disabling of vehicle operation. 
     In addition to disabling vehicle operation, in a preferred, optional embodiment, control chip  14  also acts to both disable other functions and enable different functions. Thus, by controlling other relays or switches (not shown in  FIG. 1 ) the computer chip  12  can be used to turn off the vehicle radio communication equipment, the siren, the electronic shotgun rack and like unite on the vehicle so as to deny an unauthorized user access to these units or equipment. In addition, with an optional “power on” feature, computer chip  12  can be used to enable emergency light bars, camera systems, recorders and/or any other equipment. 
     It is important to understand that when the protected vehicle in which the first unit  10  is located and the second unit  32  are no longer separated by a distance greater than said separation distance, the status quo is reestablished, i.e., the disabled functions are enabled and the enabled functions are disabled. 
     As indicated above, the system of the invention operates in its basic mode automatically, without any buttons to push or codes to remember. However, in an important implementation, switch  34  of unit  32  or another switch associated with the unit, can be used by the wearer of the unit, i.e., the authorized driver of the protected vehicle, to control other functions. Before considering these other functions, the “automatic” function will be briefly reviewed. As indicated above, with the automated function, if the vehicle is driven out of the preset perimeter (i.e., beyond a circular perimeter having a radius equal to the preset distance), the main computer chip  14  will activate the disabling and enabling functions described above. Further, when the vehicle reenters the perimeter the computer chip  14  resets all functions so that vehicle can be driven by the authorized driver (the wearer of unit  32 ) in a normal manner. This automatic function is for general use and protects the vehicle at all times. 
     An “activate now” function involves moving switch  34  to a corresponding position, e.g., an “activate” position, and enables the authorized driver to immediately activate the main computer control chip  14 , and all disabling and enabling functions, by means of signal from “reflector” unit  32 . Preferably, the switch position is such that this “activate now” function is selected by pushing a switch (corresponding to switch  34 ) located on top of the “reflector”  32  all the way to a position opposite its automatic “on” position (indicating by the “test” position in  FIG. 2 ). 
     This “activate now” function is used to immediately disable the vehicle in the event of an emergency. 
     For an “off” function, the switch  34  is moved to the “off” position and the vehicle is disabled after a very short delay (e.g., 15 seconds) until the switch  34  is placed in the “on” position again. In a preferred embodiment, the “off” position is the center position for switch  34 . This function keeps the vehicle in the disabled state and with all “power off” options turned off. This function is particularly helpful when the system comprising units  10  and  32  is not in service for an extended period of time and differs from the “activate now” function in that the “off” function requires a predetermined time period (e.g., 15 seconds) for disablement takes place. 
     The system also preferably includes a “park in service” override which is designed to ensure that the vehicle can remain running (operative) while service is required and the authorized driver is away from the vehicle. For example, this override can be used when a police officer is working an accident scene and may for some unforeseen reason need to move away from the vehicle (patrol car) a distance greater than the preset distance. This also protects the vehicle power supply. In this mode, the vehicle will remain running while all of the other “power on” and/or “power off” options are triggered. On the other hand, if the vehicle is taken out of park while the authorized user (e.g., a police officer) is outside of the preset perimeter, the fuel system and/or ignition system will be automatically disabled as in the “automatic” mode. 
     As indicated above and is shown to some extent in  FIG. 2 , control device  32  is generally of the size, shape and outside appearance of an ordinary pager or like electronic device and is preferably adapted to be worn on the belt or other worn on the person by a clip or the like (not shown). 
     Although, as indicated above, different transmitters and receivers can be used, circuit diagrams of one preferred embodiment of the transmitter are shown in  FIGS. 3(   a ) and  3 ( b ) and circuit diagrams of one preferred embodiment of the receiver are shown in  FIGS. 4(   a ),  4 ( b ),  4 ( c ),  4 ( d ),  4 ( e ) and  4 ( f ) wherein  FIGS. 4(   a ) and  4 ( b ) together form one circuit and wherein  FIGS. 4(   d ) and  4 ( e ) form one circuit. The transmitter is described in part in, and/or covered by, the following U.S. Pat. No. 4,977,577; U.S. Pat. No. 5,119,396; U.S. Pat. No. RE 35829; and U.S. Pat. No. 5,408,217. The receiver is described in part in, and/or covered by, the following U.S. Pat: U.S. Pat. No. 5,095,493; U.S. Pat. No. 5,598,427; U.S. Pat. No. 5,953,368; U.S. Pat. No. 5,377,222; U.S. Pat. No. 5,067,136; U.S. Pat. No. 6,031,883; U.S. Pat. No. 5,408,217; U.S. Pat. No. 5,457,713; U.S. Pat. No. 6,111,911; U.S. Pat. No. 5,668,828; U.S. Pat. No. 5,999,561; and U.S. Pat. No. 5,920,589. Descriptions and component values for the various circuit components of the transmitter and receiver, respectively, are listed in Table 1 and Table 2 below. 
     
       
         
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 COMPONENT 
                 DESCRIPTION 
               
               
                   
               
             
             
               
                 C7 
                 470 pF, +/−5%, 0603, 50 V, NPO, CERAMIC CHIP CAPACITOR 
               
               
                 C1, C2, C3, C4, C5, C6 
                 47 nF, +/−10%, 0603, 16 V, X7R, CERAMIC CHIP CAPACITOR 
               
               
                 R7 
                 12 OHM, 1/10 W, 5%, 0603 CARBON FILM RESISTOR 
               
               
                 R9 
                 51 OHM, 1/10 W, 5%, 0603 CARBON FILM RESISTOR 
               
               
                 R2 
                 560 OHM, 1/10 W, 5%, 0603 CARBON FILM RESISTOR 
               
               
                 R1, R4, R8, R16 
                 1K OHM, 1/10 W, 5%, 0603 CARBON FILM RESISTOR 
               
               
                 R10 
                 4.7K OHN, 1/10 W, 5%, 0603 CARBON FILM RESISTOR 
               
               
                 R11, R12, R13, R15 
                 10K OHM, 1/10 W, 5%, 0603 CARBON FILM RESISTOR 
               
               
                 R5, R6 
                 100K OHM, 1/10 W, 5%, 0603 CARBON FILM RESISTOR 
               
               
                 L1 
                 1000 nH, +.−10%, EPOXY DIPPED INDUCTOR 43LR104 
               
               
                 LED1 
                 RED RIGHT ANGLE THRUHOLE LED 
               
               
                 SW1 
                 SLIDE SWITCH THRUHOLE 
               
               
                 SW2 
                 THIN PUSHBUTTON SWITCH MOMENTARY 
               
               
                 Q1, Q3 
                 MMBT3906LT1 PNP TRANSISTOR SOT-23 
               
               
                 Q2, Q4 
                 MMBT3904LT1 NPN TRANSISTOR SOT-23 
               
               
                 J1 
                 AX620 TRANSMITTER 
               
               
                 U1 
                 RESET CHIP 2.25 v TRIP SOT23-5 
               
               
                 U2, U3 
                 4 BIT SYNCHRONOUS BINARY COUNTER TSSOP14 
               
               
                 U4 
                 2 INPUT NAND GATE TSSOP14 
               
               
                 U5 
                 2 INPUT AND GATE SOT23-5 
               
               
                 A1 
                 PIEZO ELEMENT RADIAL LEAD 
               
               
                   
               
             
          
         
       
     
     
       
         
               
               
               
             
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 REF DES 
                 DESCRIPTION 
                 QTY 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 C1 
                 CAP RAD AL 470 UF 50 V +/−20% 
                 1 
               
               
                 C10 
                 CAP 0603 CER 18 PF 50 V COG +/−5% 
                 1 
               
               
                 C11 
                 CAP 0603 CER 18 PF 50 V COG +/−5% 
                 1 
               
               
                 C12 
                 CAP 0603 CER 1 UF 16 V X7R +/−10% 
                 1 
               
               
                 C2 
                 CAP D-PKG TAN 2.2 UF 50 V +/−20% 
                 1 
               
               
                 C3 
                 CAP SMT AL 470 UF 16 V +/−20% L- 
                 1 
               
               
                   
                 ESR 
               
               
                 C4 C5 C6 C7 
                 CAP 0603 CER 0.1 UF 50 V X7R +/−20% 
                 4 
               
               
                 C8 
                 CAP B-PKG TAN 10 UF 16 V +/−20% 
                 1 
               
               
                 C9 C13 C14 C15 C16 C17 C18 C19 
                 CAP 0603 CER 39 PF 50 V COG +/−5% 
                 11 
               
               
                 C20 C21 C22 
               
               
                 D1 D2 D3 D4 D5 
                 DIO SMA 1 A 50 V GLASS PASS 
                 5 
               
               
                 D6 
                 DIO SMA B150 50 V 1 A SCHOTTKY 
                 1 
               
               
                 D7 
                 DIO SOT-323 BAV70 DUAL SW COM 
                 1 
               
               
                   
                 CATH 
               
               
                 J1 
                 CONN HDR TH 5P M STR.100 
                 1 
               
               
                   
                 FRICTLK 
               
               
                 J2 
                 SKT 1 × 8 RA ½″ STDF 
                 1 
               
               
                 J3 
                 CONN HDR TH 2 × 7 M STR.100 
                 1 
               
               
                 JP2 JP6 
                 CONN HDR TH 1 × 2 M STR.100 
                 1 
               
               
                 JP1 
                 CONN HDR TH 2 × 4 M STR.100 
                 1 
               
               
                 JP5 
                 CONN HDR TH 2 × 3 M STR.100 
                 1 
               
               
                 J4 
                 CONN HDR 14 CKT R/A MINI-FIT JR 
                 1 
               
               
                 K1, K2, K3, K4 
                 LOW SENSE RELAY SPDT 5 VDC 1A 
                 4 
               
               
                 L1 
                 IND SMT 470 UH +/−20% POWER 
                 1 
               
               
                 LED1 
                 LED GRN CLEAR Z-BAND TR7 
                 1 
               
               
                 LED2, LED4, LED5, LED6 
                 LED RED CLEAR Z-BAND TR7 
                 4 
               
               
                 LED3 
                 LED YEL CLEAR Z-BAND TR7 
                 1 
               
               
                 R1, R9, R10, R11, R12, R13, R14, R15, 
                 RES 0603 TKF 10K 5% 1/16 W 
                 14 
               
               
                 R16, R18, R20, R21, R22, R23 
               
               
                 R17 
                 RES 0603 TKF 100K 5% 1/16 W 
                 1 
               
               
                 R6, R8, R29, R30 
                 RES 0603 TKF 1K 5% 1/162 
                 4 
               
               
                 R24 
                 RES 0603 TKF 2K 5% 1/10 W 
                 1 
               
               
                 R25 
                 RES 0603 TKF 7.32K 1% 1/10 W 
                 1 
               
               
                 R26 
                 RES 0603 TKF 1.2M 5% 1/10 W 
                 1 
               
               
                 R31, R32, R33, R34 
                 RES 0603 TKF 0 R 5% 1/16 W 
                 4 
               
               
                 R2, R3, R4, R5 
                 RES 0805 TKF 470 R 5% 1/8 W 
                 4 
               
               
                 R7, R19, R27, R28 
                 RES 0603 TKF 1.8 K 5% 1/10 W 
                 4 
               
               
                 TS1 
                 DIO D0214AC TVS 40 V 1 A BI-DIR 
                 1 
               
               
                 U1 
                 MCTL TSSOP-20 MSP430F 
                 1 
               
               
                 U2 
                 IC 74LVC07 TSSOP-14 HEX BUFFER 
                 1 
               
               
                 U3 
                 500 mA, 50 V, 7 CHANNEL, NPN 
                 1 
               
               
                 U4 
                 IC TSSOP-16 74HC4053 ANALOG 
                 1 
               
               
                   
                 MUX 
               
               
                 U5 
                 IC 74LVC125 SOT23-5 HEX BUFFER 
                 1 
               
               
                 VR1 
                 REG TO-263-5 LM2575 ADJ 1A 
                 1 
               
               
                 VR2 
                 REG SOT-89-3 S-81233 3.3 V +/−2.4% 
                 1 
               
               
                 Y1 
                 4.9152 Mhz crystal 18 pf 30/50 ppm 
                 1 
               
               
                   
                 SMD 
               
               
                   
                 PCB 2 layer 
                 1 
               
               
                   
                 SHUNT 0.100 BLK 
                 1 
               
               
                   
                 AX420 RECEIVER 
                 1 
               
               
                   
                 PLSTC HSG BLACK 
                 1 
               
               
                   
                 CONN HDR 14 CKT HOUSING R/A 
                 1 
               
               
                   
                 MINI-FIT JR 
               
               
                   
                 SOCKET PIN 18–24AWG MOLEX 
                 14 
               
               
                   
                 MINI-FIT 
               
               
                   
               
             
          
         
       
     
     Although the invention has been described above in relation to preferred embodiments thereof, it will be understood by those skilled in the art that variations and modifications can be effected in these preferred embodiments without departing from the scope and spirit of the invention.