Patent Application: US-15497293-A

Abstract:
a security device for a cart wheel utilizing a housing which is mounted to the cart in the vicinity of the wheel . a locking element supported to the housing and is selectively movable into positions engaging the cart wheel or being disengaged from the cart wheel . a motor is employed to move the element in such reciprocal motion and is operated by a controller . the controller includes a counter to determine the number of revolutions completed by the wheel , and a trigger for starting the motor upon receipt of a signal from the counter representing a preselected number of revolutions completed by the wheel .

Description:
various aspects of the present invention will evolve from the following detailed description of the preferred embodiments which should be taken in conjunction with the prior described drawings . the invention as a whole is depicted in the drawings by reference character 10 . the security device 10 includes as one of its element a housing 12 having a rear portion 14 and a front cover 16 . with reference to fig1 a quartet of standoffs 20 , 22 , 24 , and 26 link rear portion 14 to cover 16 by the use of a plurality of threaded bolts 28 , fig1 and 2 . housing 12 is fastened to a fork or yoke or wheel carrier having a bolt axle 32 for wheel 34 . wheel 34 includes a core or hub 36 circumvented by a tire 38 . hub 36 is formed with a pair of recesses 40 and 42 on one side of hub 36 . recesses 44 and 46 lie on the opposite side of hub 36 . stand - offs 20 , 22 , 24 , and 26 also serve to connect yoke 30 to housing 12 . in this regard , yoke 30 is formed by side portions 48 and 50 linked by a top plate 52 . turning now to fig1 and 2 , it may be observed that side portion 48 is generally trapezoidal shaped to generally conform to the shape of rear portion 14 of housing 12 . a plurality of fasteners such as fastener 54 threadingly engage any one of the stand - offs such as stand - off 26 . back portion 14 and yoke side portion 48 include the requisite number of threaded recesses for this purpose . in addition , plug 56 is employed to friction fit within apertures 58 and 60 in housing 12 and side portion 48 of yoke 30 , respectively . thus , plug 56 represents a non - metallic bridge between the interior of yoke 30 and the interior 18 of housing 12 , transparent to a magnetic field . consequently , yoke 30 , possessing connected and rotatable wheel 34 and housing 12 , form a unit 62 . unit 62 may be mounted to a cart such as a shopping cart 70 , by the use of shaft 64 which is held to top 52 by nut 66 . shopping cart 70 is depicted with a pair of units 62 substituted for the original rear wheels , fig3 . thus , shaft 64 and nut 66 serve as mounting means 68 for holding housing 12 and wheel 34 to cart 70 . in certain cases , a single unit 62 may suffice to secure shopping cart 70 . turning now to fig1 , and 5 , it may be observed that device 10 is further provided with an element 72 selectively moveable into positions engaging cart wheel 34 and being disengaged from cart wheel 34 . activation of element 72 originates with gear reduced motor 74 which is motivated by a six volt dc current source , the details of which will be discussed hereinafter . u - shaped plate 76 is affixed to rear portion 14 of housing 12 by welding , screws , or the like . motor 74 is bolted to plate 76 by fasteners 78 . motor shaft 80 is supported by bearing 82 and extends outwardly from motor 74 . normally , shaft 80 is capable of turning axially . collar 84 affixes to shaft 80 via set screw 86 such that collar 84 and shaft 80 rotate as a unit . collar 84 is connected to a threaded jacking screw 88 which is capable of moving tabs 90 and 92 back and forth according to directional arrow 94 . lockup springs 96 and 98 extend between tabs 90 and 92 and a central drive lug 100 . drive lug 100 includes a pair of cap screws 102 and 104 which engage a pair of cam plates 106 and 108 . plates 106 and 108 pivot about pivot pin 110 , which serves as a fulcrum for the lever action of plates 106 and 108 . locking element 72 is held between plates 106 and 108 by a roll pin 112 . locking element 72 is capable of extending into recesses 40 and 42 and , thus , is capable of contacting hub 36 to stop the rotation of wheel 34 . with reference to fig5 a , it may be observed that element 72 may be positioned to pass through rear portion 14 of housing 12 and side portion 48 of yoke 30 to slidingly contact tire 38 of wheel 34 . consequently , element 72 through such sliding engagement of tire 38 would act as a brake rather than a more positive stop by direct engagement of hub 36 of tire 34 , described in detail in fig4 and 5 . it should be observed on fig1 that microswitches 114 and 116 contact tabs 90 and 92 at the extreme movement of the same laterally . such contact activates microswitches 114 and 116 , the purpose of which will be described hereinafter . microswitches 114 and 116 are connected to flanges 118 and 120 which are affixed to u - shaped plate 76 . control means 122 is also found in the present invention for activating motor 74 . control means 122 is shown schematically on fig6 and is physically located within housing 12 at circuit board 124 held to rear portion 14 by a plurality of stand - offs 126 , fig1 and 2 . circuit board 124 is capable of supporting a majority of components depicted in fig6 . control means 22 possesses a counter 128 , fig6 in the form of a reed switch 130 also depicted in block form on fig1 and 2 . reed switch is located adjacent non - metallic plug 56 and is capable of receiving a magnetic pulse from magnet 132 fastened to hub 36 of wheel 34 . infrared receiver 134 , fig1 and 2 is mounted within chamber 18 of housing 12 adjacent circuit board 124 . a window 135 , thereof , is capable of receiving a discreet infrared signal to initiate the counting function of control means 122 . with reference to fig6 the infrared module fe1 is deemed part of receiver 134 . with reference to fig3 it may be seen that infrared signal generators 136 and / or 138 may be employed when device 10 on cart 70 is to be activated . hand held signal generator or transmitter 138 is capable of sending a multiplicity of discrete signals , including a signal activating device 10 . for example , transmitter 138 may include a series of buttons 140 corresponding to a particular function to be described hereinafter . simple activation is initiated when shopping cart 70 passes through a check - out counter or leaves the confines of the store edifice by the use of fixed buttonless transmitter 136 , utilizing the same transmitter chip as generator 138 . with reference to fig6 it may be observed that a programmable microprocessor microcomputer u3 is capable of processing various inputs depicted on fig6 . reed switch 130 , s3 , produces a count which is depicted as entering microcomputer u3 at pin rb6 . other inputs to u3 are noted on fig6 . in the case of reed switch 130 , s3 , the count input to microcomputer u3 permits microcomputer u3 to compare the reed switch closures with a pre - programmed maximum allowable number under a set count command . such set count command is transmitted to microcomputer u3 via transmitter 138 infrared receiver fe1 , and decoder u1 . decoder 1 is tuned by resonator y1 . the output command of decoder u1 alerts or flags microprocessor u - 3 to the subsequent 3 - bit binary signals emanating through ports d0 , d1 , and d2 . such signals correspond to the multiple modes of operation , described hereinafter . of course , the number of magnetic reed switch 134 closures would correspond to a particular distance traveled by wheel 134 to limit the movement of cart 70 to a particular perimeter of travel . at this point , led 142 would flash rapidly . with reference to fig1 and 2 , it may be observed that led 142 is located on housing 12 . fig6 describes the connection of led 142 through resistor r3 to microcomputer u3 . it should be noted that resonator y2 is used to tune microcomputer u3 between resonating capacitors c5 , c6 , as well as imbalance resistor r5 . battery pack tester 144 is also linked to microcomputer u3 as depicted in fig6 . battery pack 146 is shown in fig6 as being a six volt dc battery pack in parallel with capacitors c11 and c12 . the battery test is initiated each time the &# 34 ; activate &# 34 ; command is received by receiver fe1 . the operational amplifier u2 of battery pack tester 144 is shown as being split into operational amplifiers u2a and u2b . of course , battery pack bp1 is employed to run motor 74 , m - 1 . the motor - a and motor - b outputs of microprocessor u3 represent movement of motor shaft 80 backward and forward according to directional arrow 94 of fig5 . such signal would occur when the preset wheel rotation count is reached . thus , microcomputer u - 3 , serves a trigger means 95 for starting motor 74 , m - 1 . microswitches 114 and 116 limit the travel of jacking screw 88 when contact is made with tabs 90 and 92 , respectively . for example , tab 90 is contacting microswitch 114 on fig1 and is , thus , limiting travel of jacking screw 88 and linked locking element 72 in the forward locking direction . of course , microswitch 116 would limit the retraction of locking element 72 in the opposite direction . transistors q1 and q3 switch the six - volt dc power supply to motor 74 , m1 , when a high motor - a signal and a low motor b are received from microprocessor u3 . q1 is on when q3 is off and q4 is on when q2 is off . similarly , transistors q2 and q4 switch power to initiate the movement of motor 74 , m1 in the opposite direction when a high motor - b signal and low motor &# 34 ; a &# 34 ; signal are received from microprocessor u3 . when low motor a and motor b signals are sent to microprocessor u3 , motor m - 1 doesn &# 39 ; t operate for lack of continuity . fig6 a illustrates the employment of device 10 as alarm means 148 rather than a locking element 72 for wheel 34 led - 2 may receive the output motor - a from microprocessor u - 3 and be lit thereby . it should be apparent that other alarms may be employed such as a sound source , a radio transmitter , and the like , in place of led - 2 . in such an instance , motor 74 and the mechanical linkage therefrom to element 72 would not be required . the following table represents a list of typical components used in the circuit depicted in fig6 table i__________________________________________________________________________fig6 ref : value : item : origin : __________________________________________________________________________bp1 4xl . 5v aa battery holder eagle , elk grove , ilc1 470mfd / 16v electrolytic panasonic , japanc2 22mfd / 16v electrolytic panasonic , japanc3 1mfd / 16v electrolytic panasonic , japanc4 . 1mfd / mlc monolithic cer panasonic , japanc5 20pf / 100v ceramic disc panasonic , japanc6 20pf / 100v ceramic disc panasonic , japanc7 . 1mfd / mlc monolithic cer panasonic , japanc8 . 1mfd / mlc monolithic cer panasonic , japanc9 . 1mfd / mlc monolithic cer panasonic , japanc10 . 1mfd / mlc monolithic cer panasonic , japanc11 10mfd / 16v electrolytic panasonic , japanc12 . 1mfc / mlc monolithic cer panasonic , japand1 1n4148 silicon diode philips , englandd2 1n4148 silicon diode philips , englandd3 1n4148 silicon diode philips , englandd4 1n4148 silicon diode philips , engiandd5 1n4148 silicon diode philips , englandfe1 tfmt 5380 ir module telefunken , germanyled1 , led 2 red led red led liteon inc ., milpitas , ca136 transmitter i red saa 3007 phillips , england chip138 transmitter i red saa 3007 chip w / ( 8 ) carbon buttons phillips , englandm1 6vdc dc motor , japanq1 mpsa42 npn transistor motorola , phoenix , azq2 mpsa42 npn transistor motorola , phoenix , azq3 mpsa92 pnp transistor motorola , phoenix , azq4 mpsa92 pnp transistor motorola , phoenix , azr1 220 ohm carbon resistor irc , boone , ncr2 47k ohm carbon resistor irc , boone , ncr3 , r12 120 ohm carbon resistor irc , boone , ncr4 68k ohm carbon resistor irc , boone , ncr5 100k ohm carbon resistor irc , boone , ncr6 27k ohm carbon resistor irc , boone , ncr7 470k ohm carbon resistor irc , boone , ncr8 470k ohm carbon resistor irc , boone , ncr9 100k ohm carbon resistor irc , boone , ncr10 51k ohm carbon resistor irc , boone , ncr11 27k ohm carbon resistor irc , boone , ncs1 microswitch limit switch omron , schaumburg , ils2 microswitch limit switch omron , schaumburg , ils3 reed switch reed hamlin inc ., lake mills , wisconsinu1 saa3049 ir decoder ic philips , englandu2 lm358 dual 0p - amp motorola , phoenix , azu3 pic16c56 u - comp microchip tech ., chandler , arizonay1 4 mhz xtal resonator panasonic , japany2 32 . 768 khz crystal panasonic , japan__________________________________________________________________________ fig7 represents a flow diagram representing the functions programmed into the security device of the present application . the buttons represented in the figure indicate multiple buttons 140 which may be found on ir transmitter 138 . an appendix to the application represents the object code which may be programmed into microprocessor u3 to perform the functions shown on fig7 . in operation , unit 62 is assembled by utilizing fasteners 54 to connect yoke 30 to housing 12 . such assembly permits wheel 34 to turn within yolk 30 about axle 32 . the components described hereinbefore are , of course , assembled within housing 12 , including control means 122 on circuit board 124 . unit 62 is connected to cart 70 by the use of shaft 64 which is sized to fit within a socket normally associated with a cart ( not shown ) that is capable of accepting a cart wheel . in other words , unit 62 is substituted for the original cart wheel . turning now to fig3 cart 70 is depicted having two units 62 installed . however , a single such unit 62 may suffice in most cases with respect to a cart 70 . with reference to fig7 the security device 10 is capable of seven functions , which will be discussed separately as follows : 1 . activate : to activate device 10 , infrared receiver 134 receives a discreet infrared signal from infrared transmitter 138 through window 135 . the infrared receiver 134 through decoder u1 will generate a command signal to microcomputer u3 to set the count total to zero ( 0 ). at this point , reed switch 130 , s3 , will commence counting passage of permanent magnet 132 on wheel 34 . led 142 is also initiated at this time , flashing brightly approximately every two ( 2 ) seconds for a short duration until lockup is reached or another overriding command is received from decoder u1 . such &# 34 ; count &# 34 ; output is sent to microcomputer u3 as shown on fig6 . since the diameter of wheel 34 is known , a distance is measured by the number of reed switch 130 closures . microcomputer u3 compares the number of total registered reed switch 130 closures to a pre - programmed maximum allowable number , the set count number . 2 . deactivate : a deactivate a separate discreet infrared command initiates the deactivate sequence through infrared receiver 134 . the deactivate signal from decoder u1 overrides the activate command and immediately stops the counting sequence . at this time , the total count is restored or reset to zero ( 0 ) turning off led 142 . 3 . set count : the set count sequence is initiated by a separate and discreet infrared command originating with transmitter 138 . the set count sequence selects a number of closures of magnetic reed switch 130 in incremental values . in other words , a particular button of plurality of buttons 140 of transmitter 138 would be continually pushed to increase the permissible travel of wheel 34 . for example , each time the particular button in the set count sequence is pushed , fifty ( 50 ) yards could be added to the travel of wheel 34 . of course , other distance increments may be used in this aspect of the present invention . entering the set count sequence sets the permissible number of reed switch closures to zero ( 0 ). the incremental number of closures to be preset can then be entered . the led 142 flashes rapidly when the set count is returned to zero ( 0 ). thus , the user receives the signal indicating the distance of travel starting point . 4 . lockup : the lockup command overrides either activate or deactivate . lockup initiates by the discreet infrared command to infrared receiver 134 or by the total switch closure count reaching the maximum set count number set into control means 122 . thus , the lockup sequence may be initiated , by the decoder u2 signaling microcomputer u3 when transmitter 138 sends an ir signal to receiver 134 . in either case , the u - 3 output trigger means 75 also achieves this result when the count limit is reached by the turning of wheel 34 and motor m1 in a forward direction . at this point , element 72 enters recess 42 of wheel hub 36 . power for motor m1 is received from battery pack 146 . in this regard , motor m1 causes element 72 to enter the lockup mode by rotating threaded jacking screw 88 which pivots cam plates 106 and 108 about pivot pin 110 . movement of cam plates 106 and 108 is initiated by the engagement of lockup springs 96 and 98 on lug 100 by the movement of tabs 90 and 92 along jacking screw 88 . thus , microcomputer u3 serves as trigger means 75 for starting motor 74 , m1 , either in a forward or backward direction . the forward limit of jacking screw 88 and , thus , locking element 72 is controlled by microswitch 116 contacting tab 92 . likewise , the retraction limit of element 72 is determined by microswitch 114 contacting tab 90 . with reference to fig6 it may be apparent that the microswitch signals are sent to microcomputer u3 through the appropriate port . lockup may also take the form of a braking action where element 72 contacts tire 38 of wheel 34 , fig5 a . in addition , the lockup signal may be translated into simple visual or audio alarm means 148 which may be mounted on housing 12 in the form of led - 2 . in such case , motor 74 and locking element 72 would not be used . in the event locking element 72 is not aligned with either cavity or recess 40 or 42 of wheel 34 at the time of lockup , lockup spring 96 will absorb the forward travel of tab 90 until further rotation of wheel 34 permits locking element 72 to enter either recess 40 or 42 . the security device 10 will remain in this condition until the unlock command is received by microcomputer u3 . 5 . unlock : the unlock command is initiated by a discreet infrared signal transmitted to receiver 134 and sent to microcomputer u3 from decoder u1 . the unlock command is incompatible with the deactivate , set count , or set code modes . thus , when any of these commands are in effect the command has no effect . once the unlock command is received , microprocessor u3 triggers battery pack 146 to apply power to motor 74 , m1 , in the reverse direction . in this position , drive tab 92 moves cam plates 106 and 108 in a clockwise direction , fig4 to retract locking element 72 from recess 42 of wheel 34 . once the backward limit of the travel is detected through microswitch 114 , microcomputer u3 disconnects power from motor 74 , m1 . again , lockup spring 98 is able to absorb travel of drive tab 92 if element 72 is temporarily jammed by the movement of wheel 34 during this operation . the electronic circuitry through microprocessor u3 also restores the system to the deactivate mode at this time . 6 . secure : the secure sequence is initiated by a discreet infrared command to receiver 134 . decoder u2 sends this signal to microcomputer u3 which checks to verify if the system is in the activate mode . if it is not , the system enters the lockup mode as described above . if the system is in the activate mode , the secure command is ignored . thus , the secure command will only supersede the deactivate command . once in the secure mode , the device 10 will only accept the unlock command . 7 . set security code : the set security code command can only be transmitted by a discreet signal originating with a master transmitter similar to transmitter 138 appropriately programmed and used in conjunction with receiver 134 . the set security code programs the microprocessor for the four ( 4 ) button sequence needed to access the set count sequence . this feature provides protection against unauthorized changes to the preset distances cart 70 is allowed to travel before lockup made is activated . thus , controller 122 will only activate when the security code is transmitted through receiver 134 . it should also be noted that , led 142 will continuously light when battery pack 146 reaches a pre - programmed low voltage value . while , in the foregoing , embodiments of the present invention have been set forth in considerable detail for the purposes of making a complete disclosure of the invention , it may be apparent to those of skill in the art that numerous changes may be made in such details without departing from the spirit and principles of the invention . appendix__________________________________________________________________________ 87 000 - b33 138 188 03a - 70e a26 88 001 - ba7 139 01b - 6e6 189 03c - 72e a26 89 002 - bae 140 01c - alb 190 03e - 426 90 003 - b67 141 191 03f - c00 005 91 004 - b71 142 01d - 486 192 041 - 078 92 143 01e - 4a6 193 042 - a26 93 144 01f - a21 194 94 145 195 95 146 020 - a26 196 96 147 197 97 005 - 148 198 98 149 199 99 150 200100 151 201 043 - 655101 152 202 044 - 800102 153 021 - 000 203103 1ff - a05 154 022 - 06c 204 045 - 586104 155 023 - 06d 205 046 - 4a6105 156 024 - 06e 206 047 - 7e6106 157 025 - 52e 207 048 - a47107 158 208108 159 209 049 - 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c15 515 17e - 800419 021 516420 133 - 696 b3c 465 517 17f - 076421 135 - 676 b3f 466 518422 137 - 656 b42 467 15b - c16 519423 139 - 62e b3c 468 15c - 002 520 180 - c04 099424 469 15d - 516 643 b89425 13b - 470 15e - 521 184 - c05 099426 13b - 800 471 15e - 800 643 b98427 472 522428 473 15f - 201 523 188 - b88524525526 189 - 403527 18a - c2c 1eb528 18c - 703529 18d - b8f530 18e - 2aa531 18f - 435532 190 - 20a 09a 703 b95533 194 - ba4534 195 - 06a535 196 - 06b536 197 - 556537538 198 - 403539 199 - c37 1eb540 19b - 703541 19c - b9e542 19d - 2aa543 19e - 435544 19f - 20a 09b 703 b95545 1a3 - ba4546547 1a4 - c07 034548 1a6 - 549 1a6 - 800550551552553 1a7 - cff 029554 1a9 - 2e8 ba9555 1ab - 2e9 ba9556 1ad - 557 1ad - 800558559560561562 1ae - c05 029563 1b0 - 2e8 bb0564 1b2 - 2e9 bb0565 1b4 - 566 1b4 - 800567__________________________________________________________________________ errors : 0 ======