Feb. 20, 1934. G, F, SCHECKLER 1,948,136
` DUAL TIRE WHEEL Filed Dec. 30. 1930 INVENTOR G. FISQ/1&1@ er ATTORNEY Patented Fei?,o 20, i934 STATES UNIT DUAL TIRE WHEEL Gordon F. Seheckler, Stockton, Calif., assigner of one-half to Roscoe C. Zuckerman, Stockton,
Application December 30, 1930 Serial No. 595,505
Claim. (Cl. 301-38) This invention T'elates to motor vehicles, and particularly to trucks and the like which are equipped with dual tir wheels. The advantages of the dual wheel arr `ngel-nent are well known,
e; out have found that` as such wheels are coni- 1 ground to practically great a d the invention is to provide ive device and yet one which tive for the purpose ior which it is designed.
r"Foe-se objects l accomplish hy means oi such strc ture and i htive arrangement of parts as will perusal of the following specifica ion and claim.
The figure on the drawing is an end elevation, cned i in section, oi my improved dual wheel inou. arrange-nient showing the action or eieot oi 1e oi the wheels and their load on soit ground.
Referring now more particularly to the characters reference on the drawing, l and 2 denote the inner outer tires oi" the wheel arrangement. The inner tire is mounted on a rim 3 which removahiy connected cy a web e to the flange 5 to which the driving axle oi the vehicle a considerable di is connected as usual. The vtire 2 is also mounted on a rim 5 separate the rim 3. Instead of the two tires being in close proximity to each other is usually the case however l space them ance apart.
The spacing which has been found to give the best results is approximately the width of the tire; and this being the case, the actual spacing will be proporti ately greater in a large size tire Wheel unit, and a consequently large and heavy vehicle, than in a small size tire unit and vehicle.
To rigidly yet removably connect the wheels together and maintain them the desired spaced relation the rim 5 is provided on the insidewith an annular flange 7 which engages a similar flange 8 and is removably secured thereto by bolts 9. The flange 8 projects inwardly from a rigid drum or wide band lo 'which extends between the rims 6 and 3 and is substantially the saine diameter as the tire engaging rim ange. The drum is provided with a web 11 welded thereto and which abuts against the web 4 and is removably secured to the ange 5 by bolts 12.
By reason of this arrangement of the wheels in connection with the intermediate drum it will be seen that if the vehicle is operating over soft ground, the wheels will sink into the ground. This will cause fui-rows to be made which engage not only the treads of the tires but both side walls of the same as well. The depression of the wheels into the ground compresses the ground between the wheels upwardly in the form of a ridge R, which of course is relatively wide owing to the spacing between the tires. The sides of the ridge being engaged by and pressing against the corresponding side walls of the tires, provide additional and relatively solid traction surface. With the tires in close side by side order, as at present arranged, on the other hand, the amount of dirt squeezed between the tires is so small that it cannot possibly form a compact and rela-l tively solid body, and therefore provides no additional traction surface.
In addition if the load on the vehicle is sufficiently great, or if the dirt is sufficiently soft to cause the wheels to sink relatively deep in the ground, thel central dirt ridge will be forced up to such an extent as to engage the drum 10, as shown in the drawing, and said drum then in effect forms a third Wheel. The traction then extends practically unbroken from one to the other of the two Wheels as well as across the treads of the latter. I have found from actual practice that a vehicle equipped with my improved dual wheel arrangement is able to haul a 59% greater load over soft ground, than the same vehicle with a corresponding load, but with the closely associated and ordinary dual wheel arrangement.
t is to be understood that the particuiar rim and mounting arrangement of the tires has been shown for the purposes or" illustration only and any desired or standard type may be used. The feature of my invention resides in the relatively wide spacing of the tires and the provision of the ground engaging drum therebetween.
From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the. invention, as set forth herein.
While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended c1aim.
Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:
A dual wheel structure for motor Vehicles comprising laterally separated inner and outer tirerims, a drum extending between the rims, cooperating anges about the adjacent ends of the