Digital counters and odometers
United States Patent 91 Bogart DIGITAL COUNTERS AND ODOMETERS [76] Inventor: Peter D. Bogart, 2338 Bronson Hill Dr., Hollywood, Calif. 90068 221 Filed: May 22,1973  
  21 Appl. No.: 362,751  
 Primary Examiner-Stephen J. Tomsky Attorney, Agent, or Firm-Jack C. Munro Apr. 29, 1975 [57] ABSTRACT The invention consists of an improved method of constructing and installing digital counting devices, such as odometers, digital time recorders and digital gauges, consisting of a self-destructing and tamperproof first&#34; or left counting wheel. The numeral of the first counting wheel is obliterated by mechanical (or other) means after such numeral has passed the viewing window, thereby making it useless to attempt to wheel back the counter to indicate lesser usage, and thereby promoting safety and honesty to and by user, seller and buyer of the machines or devices to which the digital counter is attached. Such improved counters are practically irreversible. The invention accomplishes such goals by abrading, crushing, painting over, expunging, cutting off, slicing through, chiseling off the numeral after it has passed the viewing window, or burning such numerals off by passing them through electrodes which close a circuit when the numeral is moved forward, immediately thereafter interrupting the flow of current, or, in the alternative, being obliterated by magnetic means.  
 1 Claim, 7 Drawing Figures DIGITAL COUNTERS AND ODOMETERS SUMMARY OF THE INVENTION The objects of the invention are to prevent spurious, fraudulent and misleading changes in digital counting devices, and thereby promote safety and knowledge of the true status, age and past use of machinery and equipment to which the digital counter is attached, or which it is part of. Thus, in common digital counting devices known as odometers, it is the unfortunate practice of turning back the odometer so as to misrepresent past usage of the vehicle, aircraft, etc., thereby not only deceiving a buyer or user, but also endangering life and property through use of improper maintenance schedules, or use of outdated and overage equipment.  
  The invention adopts a comprehensive improved method to render digital counters practically irreversible at a point where reversibility is becoming dangerous. This is accomplished by a self-destruct mechanism, which obliteratcs the numeral on the first (or topdigit) wheel after it has passed the viewing window. Further security is provided by engraving on to or etching into the wheels of the digital counter permanently the identifying numbers or letters of the equipment (motor, etc.) to which the digital counter is annexed, so as to alert every person to any changes.  
  A further object of the invention is to provide an inexpensive yet virtually invulnerable and tamperproof digital counting device (for brevitys sake the term &#34;odometer&#34; will be used hereinbelow an example for all digital counters). Thus. a standard odometer consists generally of five or six independent wheels, operated by the motion of the speedometer shaft (or propeller shaft), which record elapsed distance. The units are from l/lOths to 10,000s. A small driving catch generally rotates the next wheel (to the left) one place or digit for each complete revolution of the preceding disc. Thus, by way of illustration, a 6-digit odometer would under the improved method turn up to 99,9999 units miles, knots, kilometers etc. at which point there would appear in the viewing window an obliterated space on the first wheel, indicating excessive usage, and making any wheeling back of the odometer useless. Even prior to the end of the first wheel, it would be virtually useless to wheel back the odometer, since the most anyone could gain would be, in the foregoing example, some 9,000 units, which is a generally acceptable margin on motor vehicles.  
  A still further object is to relieve law enforcement personnel from policing the odometer readings of motor vehicles or other instruments, machinery and equipment.  
  Other objects and purposes and methods of accomplishing them will appear from the specification and drawings, in which:  
  FIG. 1 is a somewhat enlarged, three-dimensional, oblique view of an odometer with associated housing and certain parts removed for reasons of drawing simplification and clarity.  
  FIG. 2 is a view in leftend elevation of the representative odometer of FIG. 1 shown in mounted relationship with rcspect to a fragmentarily and sectionally shown motor-vehicle odometer housing, and with one representative emobidment of the present invention as-.  
 sociated with the odometer for preventing the reversing of the left odometer wheel, which indicates the highest numerical power.  
  FIG. 3 is a somewhat enlarged, fragmentary view partly in elevation and partly in section taken substantially along the plane and in the direction indicated by arrows 33 of FIG. 2, and shows an obliterated numeral carried by the left odometer wheel after it has passed the viewing window.  
  FIG. 4 is a fragmentary side view, partly in elevation, and partly in section, taken substantially along the plane and in the direction indicated by the arrows 44 of FIG. 3; it clearly illustrates the number-obliterating or number-erasing means of the representative first alternative of the invention in action.  
  FIG. 5 is a view of aspect similar to FIG. 2, illustrating a slightly modified form of the invention, wherein the number-obliterating device is an abrasive or grinding means for effectively abrading or grinding away an odometer numerical, after it has passed the viewing window, rather than a crushing means as shown in the first alternative.  
  FIG. 6 is a better, somewhat enlarged, staggered plane view taken substantially along the staggered plane and in the direction indicated by the arrows 66 of FIG. 5, showing the grinding-wheel type of numberobliterating or number-erasing means in action.  
  FIG. 7 is a view generally similar to FIGS. 2 and 5, illustrating a further representative modification of the number-obliterating means, comprising multiple, circumferentially arranged, sealed, marking-agent compartments arranged to be effectively opened and applied in an inking or painting manner to an odometer numeral, only at the instant that it has passed the viewing window, thereby obliterating same.  
  FIG. 8 is a fragmentary, somewhat enlarged view taken generally as indicated by arrows 88 of FIG. 7, showing the inked-over or painted-over numeral of the left odometer wheel, after it has passed the viewing window and has been effectively obliterated.  
  FIG. 9 is afragmentary aspect similar to FIG. 4, showing a further alternative, whereby the numberobliterating means removes an exterior numeral panel from the underlying wheel after it has passed the window.  
 DESCRIPTION OF THE INVENTION The invention is an improvement of existing digital counters, with an improved feature of selfdestructing&#34; first (or left) wheel, which makes a reversal or wheeling back of such counter completely useless and hence non-feasible.  
  With&#39;reference to FIG. 1, a typical digital counter is illustrated, sometimes known as odometer,&#34; with the housing and certain parts removed. The odometer is typically driven through a small worm gear, mounted on the speedometer shaft of a vehicle. The motion of the speedometer shaft, greatly reduced by another gear unit, is transmitted to the odometer. Since a certain number of revolutions of the shaft corresponds to a certain distance travelled by the wheels of the car, the odometer gives a directreading of the distance covered, e.g., miles, knots, kilometers, etc. The odometer 10 includes all the odometer wheels, (generally 5 or 6 independent wheels bearing equidistant numerals from 0 to 9 on the outer surface of each wheel). When the right wheel, which counts customarily l/lOth units, has performed a complete revolution, typically a small driving catch rotates the second wheel from the right, one place. The process is continued until the left (or first&#34;) wheel 12, which in the illustration indicates 10,000 units, is advanced one place upon completion of a complete turn by the second wheel from the right. The first version of the invention is illustrated by FIGS. 1 4 4. The worm 14 is driven by the conventional odometer cable (not illustrated), which drives a worm wheel 16 mounted on a shaft 30, which drives directly the six odometer wheels of the complete odometer 10, each effectively at a rate one-tenth of the preceding odometer wheel, as one proceeds from the right end to the left end of the complete odometer and wheel 12.  
  FIG. 2 shows a left end elevation of odometer 10 shown with a fragmentarily and sectionally shown housing 18, generally mounted on a dashboard. The wall of the odometer housing 20, which faces the person driving the vehicle, is penetrated by a transparent viewing window 22. Reference numeral 24 generally designates a representative first type of obliterating means for obliterating the numeral 28 of the left odometer wheel 12, which is shown in the specific example in FIG. 2 as consisting of a crushing wheel 26. Said crushing wheel 26 is in engagement with the exterior of the left odometer wheel 12, at a location just past the viewing window 22, and operates by effectively crushing, cracking and flaking away of the brittle numerals 28 of the left odometer wheel 12. The crushing wheel 26 is located so the periphery of wheel 26 is in tight contact with the exterior of odometer wheel 12, the contact being so tight that the teeth 32 of the wheel 26 cut into the exterior of odometer wheel 12. The crushing wheel 26 is rotatably driven along with the rotation of the left odometer wheel 12 by the inherent frictional engagement therebetween.  
  The number-obliterating process according to the first version of the invention is best illustrated in FIG. 4. The crushing teeth 32 of the crushing wheel 26,  
 which crush, crack and break away the outer layer 34 FIG. is a view similar to FIG. 2. The left-end elevation of odometer a inside a fragmentarily and sectionally shown housing 18a; the wall of the odometer housing 20a is penetrated by a transparent viewing window 22a. All wheels of odometer 10a are mounted on a common shaft or spindle 30a, upon which is affixed a coupling gear 38, which drives the second coupling gear 36, which, in turn, drives a grinding or abrading wheel 26a, that grinds away or abrades the numeral 28a from the left wheel 12a of odometer 10a. FIG. 6 is a different, staggered plane view of the process shown in FIG. 5, where the grinding wheel 26a has ground off and/or abraded numeral 28a carried on the left wheel 12a of the odometer 10a, which left wheels exterior surface 34a has rotated opposite the rotating grinding wheel 26a after passing the viewing window 22a. Reference numeral 24a generally designates the modified left-odomcter-wheel-number (28a) obliterating or erading means which includes the grinding wheel 26a and two coupling gears 36 and 38.  
  The second modification shown in FIGS. 7 and 8 employs the same reference numerals, followed by the letter b, for similar parts and employs new reference numerals for new parts as follows:  
  FIG. 7 is a view generally similar to FIGS. 2 and 5, illustrating a further representative modification of the number obliterating means, comprising multiple, circumferentially arranged, sealed (40) compartments or cells containing a marking agent 42, mounted along the outer circumference of a rotating wheel 26b, which contains an outer layer of the obliterating agent 24!). The latter is positioned for crushing the plural, externally sealed, individual, circularly arranged compartments 40, one by one; said compartments 40 each have a breakable outer exterior covering, and inside a drop of ink or paint, or an inked sponge or the like 42. Each compartment is crushed or sliced open on contact with the numeral of the left wheel 12b of odometer 10b, after the complete revolution of the next-to-the last odometer wheel has turned the left wheel 12b one digit past the viewing window 22h mounted on the wall of odometer housing 201; which faces the driver or observer. FIG. 7 is a representative left end elevation of the second modification, shown in mounted relationship with a sectionally shown odometer housing 18b. FIG. 8 shows the inked-over and obliterated numeral 34b of the left odometer wheel 12b, completely inked over as specifically shown by reference&#39;nurneral 44.  
  A third modification is illustrated by FIG. 9; all parts similar to previously described parts are designated by the same reference numerals, followed by the letter 0. Reference numeral 24c generally designates the leftodometer-wheel (12c)-obliterating or erasing means, which in this third modification comprises a chisel 46, closely engaged under the end of an outer layer 340 which carries the left odometer wheel numbers, so as to strip away each left odometer number after it has passed the viewing window 22c, which is mounted on the instrument panel 200. Numeral 10c generally illustrates the odometer in this side view designated as FIG. 9, which is a fragmentary sideview, partly in elevation and partly in section.  
  Not illustrated are similar applications of the invention to other digital counters for time, distance, flowthrough, etc., all of which are called herein odometer.  
  In the foregoing description and the annexed drawings I have disclosed four particular alternative embodiments of the invention, i.e., FIGS. 2-4 for the first, FIGS. 5-6 for the second, FIGS. 7-8 for the third and FIG. 9 for the fourth alternative particular embodiment.  
  It will be readily understood by those skilled in the art that many of the details and particular forms described can and will be varied, without departing from the spirit and scope of the invention. For the sake of brevity l have omitted such specific alternatives of the invention. and its adaptation to particular conditions and specific forms of digital counters. Be it understood, nevertheless, that I claim priority of invention for any and all forms of digital counters, having more than one counting disc or counting wheel, such as the odometer specifically described, which has the highest-powered wheel or disc connected to an obliterating or detroying device which obliterates or destroys said highestpowered numeral at a point when it has passed the point of usefulness, without interfering with the continuing operation of any of the other wheels of the digital counter, thereby making such digital counter irreversible, and promptly alerting all persons to the true status of prior use of the machine, equipment or device to which the digital counter is attached.  
 I claim:  
  1. In combination with a digital counter consisting of two or more movable wheels mounted on a common shaft, rotation of said shaft to effect movement of said wheels with each said wheel being movable at a different ratio of movement with respect to the other of said wheels with there being a single said wheel movable at the slowest ratio, indicia located on the periphery of said slowest moving wheel, an in line section of said wheels being observable through a viewing window formed within a housing, said wheels being rotatably mounted with respect to said housing, the improvement comprising:  
 an obliteration means mounted adjacent said slowest moving wheel, said obliteration means to effect obliteration of said indicia upon said slowest moving wheel after said indicia is moved across said viewing window and no longer observable there through, wherein said obliteration means comprises;  
 a single crushing wheel rotatably mounted upon said housing, said crushing wheel having a toothed periphery, said toothed periphery of said crushing wheel being in tight frictional contact with said slowest moving wheel, whereby as said slowest moving wheel is moved said crushing wheel is moved resulting in said toothed periphery obliterating the portion of said indicia which passes said viewing window.