All terrain vehicle
FIELD OF INVENTION 
     The invention lies in the field of amphibious, all-terrain vehicles, and particularly such vehicles as are supported on land by a plurality of wheels, which wheels are so motivated as to propel the vehicle either on land or while floating on water. said wheels are revolubly mounted, and are all propelled by said endless chain, or the like, which is itself driven by a power source carried by the vehicle. The wheels carry pneumatic tires and are so designed as to resist access of moisture, dirt, and the like to the valves. The wheel axle assemblies are designed to allow the wheels to be positioned along the chain wherever two links of chain are pivotally connected. 
     DESCRIPTION OF THE PRIOR ART 
     The prior art discloses vehicles of this nature, with pluralities of wheels driven by cables and belts, but none of which appear to show any means of adjustably spacing a supplementary runway on the track structure to take up undesired slack in a driving element, such as a chain drive. Nor, does any of the prior art, so far as is known to applicant, provide specially designed wheels to resist admission of dirt or moisture to a valve (for inflating or deflating the tire), which provision is of importance in a vehicle intended to encounter a variety of dusty, muddy, and wet surfaces. Further, no prior art appears to utilize the conception of structurally reinforcing the body of a vehicle in such a manner that a track structure support may be laterally projected exteriorly of said body and secured to an inner support of said body to avert weakening of a side wall of said body. 
     SUMMARY OF THE INVENTION 
     Invention lies in the provision in a vehicle supported and propelled by a plurality of wheels, disposed to be driven by an endless chain, and constituting an upper and lower moving span of wheels, of an adjustable supplementary runway disposed in substantial parallelism to a fixed runway of said track structure, for adjustment toward and away from said track structure to increase or decrease as desired, the amount of slack in the driving chain. 
     Invention is further thought to lie in the provision of a novel and specifically designed wheel for such vehicle to protect the air inlet-outlet valve of a pneumatic tire from dust, dirt and moisture. 
     Invention is thought to reside still further in a novel structural provision of laterally extending support members conjoining and supporting two opposite walls of a body, and secured within said vehicle in such a manner as to afford attachment to said supporting members of outboard projections or extensions to mount said track structure, thus providing for a rigid body construction which is not weakened by addition of the track structure support members. 
    
    
     This invention is attained by the disclosure set forth in the following specification, and illustrated in the accompanying drawings, wherein: 
     FIG. 1 is a plan view, looking down upon the device, with some of the deck members, broken away for the sake of clarity. 
     FIG. 2 is a side elevational view taken on line 2--2 of FIG. 1. 
     FIG. 3 is a vertical, sectional view taken on line 3--3 of FIG. 2. 
     FIG. 4 is a partial horizontal top view of the machine taken on line 4--4 of FIG. 2, and showing (in a larger scale) a fluid motor and chain drive as it would appear in the lower right hand portion of FIG. 1. 
     FIG. 5 is a partial, vertical, sectional, elevational view taken on line 5--5 of FIG. 4. 
     FIG. 6 is a view taken on line 6--6 of FIG. 4, showing on a substantially larger scale, the device for retaining and adjusting the supplementary runway. 
     FIG. 7 is a vertical, partial view in partial section taken on line 7--7 of FIG. 4, omitting a tire and showing only the axle, chain links, and hub members of the wheels to illustrate the construction of said members. 
     FIG. 8 is a vertical, partial view in partial section taken on line 8--8 of FIG. 7. 
    
    
     In these views, the reference character 1 indicates generally the body of said vehicle, said body having a bottom wall 2, and spaced apart, opposite sidewalls 3 and 4. 
     The bottom wall 2 of the vehicle forwardly terminates in an upwardly sloping wall 5, and rearwardly in a similarly upwardly sloping wall 6. The forward end portion of the vehicle has a downwardly sloping wall 10, convergent with the said wall 5, and the rear portion of the vehicle has a similarly, downwardly sloping wall 11 convergent with the aforesaid wall 6. The converging front walls, 5 and 10, are conjoined by a flat vertical strip 12, and the convergent rear walls 6 and 11 are conjoined by a flat strip 13. 
     It may be desired to surmount the front portion of the vehicle with a deck 14, and, for illustrative purposes, there is disclosed a hood 15 in which dials such as speedometer, oil pressure, temperature gauges, etc., may be located. 
     As may best be seen in FIG. 1, the side walls are rigidly conjoined by tubular braces, or cross members 16. The respective ends of said braces are secured, as by welding, to rectangular blocks 20, which in turn are welded to the respective side walls 3 and 4 of the vehicle. 
     Longitudinal channel members 21 are rigidly secured as by welding to the bottom wall 2 of the vehicle, and extend as shown particularly in FIG. 1, the full length of said bottom wall. The end portions of said longitudinally disposed channel members may have their lower surfaces altered to conform to the upward slopes of the respective front and rear walls 5 and 6. Preferably disposed for balance of the vehicle, in the central area thereof, is an engine 23 and a pump 24. 
     From the pump, suitable conduits (not shown) lead to each of four fluid motors 25 to transmit driving power from the engine 23, and it is proposed to equip the vehicle with appropriate controls (not shown) to govern the flow of fluid from said pump 24 to the left and right hand pairs of said fluid motors 25 to govern direction and speed of the vehicle. Obviously, if the right hand chain of wheels is immobilized, while the left hand chain of wheels is driven, it would result in a turning motion of the vehicle, depending upon which direction the left hand chain of wheels is moving. 
     Further, for illustrative purposes, there is disclosed as may be seen in FIG. 1, a seat 26 for the driver of the vehicle, with a pair of manually operable control levers 27 which are shown merely to illustrate a form of controls. 
     With further reference to the fluid motors 25, provision is made to mount each motor upon a respective, vertically disposed plate 28. The lower end portion of each said plate is secured, as by bolts, screws, or the like (not shown), to the channel member 29 extending longitudinally of the vehicle, and rigidly surmounting two of the cross members 16. Spaced upwardly from and disposed parallel to said channel member 29 is a support member 33, which may be of angle iron, or the like. Conjoining and rigidly spacing the channel member 29 with said upper support member 33 are vertical struts 34, 34a. Further contributing to the rigidity and stability of the fluid motor mounting structure are horizontal braces 35 and 35a, which extend from said upper support member 33 to the adjacent sidewall of the vehicle. In FIG. 4, the horizontal brace 35a is partially broken away to more clearly illustrate the elements thereunder. 
     The fluid motors 25 are each equipped with a drive shaft 36, which projects through its respective mounting plate 28 and through a bearing block 37, which may be secured to said mounting plate in any desired manner, to mount a sprocket 41. A chain 42 is carried, and driven by said sprocket 41, to drive a sprocket 43 mounted upon and driving a driven shaft 44. A pair of bearing blocks 45 and 46 are disposed respectively on the inner and outer surfaces of a sidewall, to journal the shaft 44. Enclosing a substantial portion of each said shaft 44 is a tubular spacer member 50. A pair of sprockets 51 and 52, is mounted upon and driven by each shaft 44, as by splined interconnection (not shown), the spacing of said inner and outer sprockets being maintained by the aforesaid spacer 50. Any convenient means, such as a cotter pin, or the like, may be used to resist escape of each outer sprocket 52 from its shaft 44. 
     As is clear from FIGS. 1 and 2, there is a rearwardly disposed pair and a forwardly disposed pair of said externally mounted sprockets 51, 52 on each side of the vehicle, and said sprockets carry and drive an inner chain 53 and an outer chain 54. Said chains are constructed in the manner of bicycle or motorcycle drive chains, and are provided with sleeves 55 which space the side members 57 of the chain, and with stub shafts 56 which are appropriately and conventionally formed to resist escape of said side members, while affording rotation of said side members about the pivotal axis of the stub shaft 56. 
     The vehicle is provided with wheels 51, having pneumatic tires 60. As may best be seen in FIGS. 7 and 8, said wheels are provided with spaced apart, dished hubs 61, secured concentrically, as by welding, upon a tubular wheel axle 62. The end portion of the tubular axle may be recessed to receive bearings 63. Each wheel is provided with an axle shaft 64 which extends through said bearings, and has end portions 65 dimensioned in such a manner as to replace the aforesaid stub shafts 56. This arrangement affords the disposition of a wheel at any point in which there is a juncture between two links of the chain, and further affords disposition of such wheels in either regular or irregular sequence, should the latter for any reason be desirable. A cotter pin hole 66 is shown in the ends of the shaft, and may receive a cotter pin, or the like, to resist withdrawal of the chain from the side member 57 from the outer portion 65 of the shaft 64. 
     As is best seen in FIGS. 7 and 8, at least one of the dished hub members is equipped with a valve 70, whereby a pneumatic tire (not shown in FIGS. 7 and 8) may be inflated or deflated. As the vehicle travels in water, snow, mud, dust, and on ice, it is desirable that the valve be protected from these elements, and for this reason, and also to strengthen the outer peripheral portion of the hubs 61, each hub receives a closure disc 71 which may be welded peripherally at the hub, as well as being welded to the tubular axle 62. To afford access to the valve, said closure disc is apertured at 72, and said aperture is covered with a dust cover 73, secured as by a screw 74 to cover said closure disc 71. 
     A track structure 75, 76 for the aforesaid wheels 59, includes outboard tubular supports 80 projecting laterally from the respective sidewalls 3 and 4. An end of each said tubular support is welded or otherwise secured to a block 81, which block is aligned on the outer surface of a respective side wall with a rectangular block 20, which is welded to the inner surface of the respective side wall. It is proposed to secure the outboard blocks 81 to the interior blocks 20, as by screws 82, threadedly received in dead-end holes formed in said blocks 20. Thus, with a weld extending peripherally, completely around the interiorly mounted blocks 20, and with said screw holes being dead-ended, there is no possibility of water seepage into the body through said screw holes. 
     Each respective outboard tubular support member 80 is preferably formed with upper and lower flats, to facilitate the mounting on said flats of an upper fixed runway member 83 and a lower fixed runway member 84. Said runways are in the form of channels, having side walls 83a, 84a, and may be secured to the tubular outboard supports 80 as by screws, welding, or any other suitable manner (not shown). It should be noted, that the ends of each upper and lower runway, 83, 84, are secured to the tubular spacer member 50 for rigidity. Semi-circular end pieces 85, 86 are secured to each end of each fixed runway as a continuation of the side walls 83a, 84a. 
     However, in order to obtain adjustment of slack in the chain without the necessity of providing an adjustable axle for the various sprockets 51, 52, a supplemental runway 87, 88, is disposed above the upper, fixed runway 83 in a substantially parallel relationship to said upper track member. A plurality of retaining shoulder screws 90, extend through said upper, fixed track member and each has an end portion threadedly received in said supplemental runway to retain said supplemental runway in position. Each retaining screw 90 carries a spring 91 which reacts between said upper, fixed runway and the head of said screw 90 to urge the supplemental runway toward the track structure. 
     To counter the action of the spring 91, there is provided an adjusting screw 92, which has threaded engagement in a block 93 and through the upper, fixed runway 84, so that its end portion may bear against the under surface of the supplemental runway 87, 88. The block 93 is welded to the under surface of said upper, fixed runway 83, and a jam nut 94 may secure said adjusting screw 92 against undesired rotation once the supplemental runway 87, 88 has been positioned. The supplemental runway could extend as a single element the full extent of the track. However, it may be desired to divide such suplemental runway into the two sections, 88, 88, as may best be seen in FIG. 5. 
     It is conceivable that a supplemental runway could be disposed beneath the lower, fixed runway, either to supplement or substitute for the supplemental runway as hereinbefore described. 
     It will be apparent that all of the wheels will move in an elongated orbit, extending longitudinally of the vehicle, and that as all of the wheels are carried by the chain, in the travel of the chain, and as the drive is not to the axles of the wheels, there is no possibility that individual wheels will spin and dig in.