Sept. 24, H. E. SHAEFFER f TOY FLYING MACHINE Filed Feb. 19., 1945 . 2,408,275 ' 2 Sheets-Sheet 1 l Sept. 24, 1946. H. E. SHAEFFER 2,408,275 TOY FLYING MACHINE Filed Feb. 19', 1945 . ‘ 2 Sheets-Sheet 2 ` Patented Sept. 24, Y1946 l 2,408,275!` omas ` 2,408,275 ,_ _ _ , c ì `Y'I‘OYFLYING 'y p .» Harvey vE. Shaeffer, Chicagm'lll., assignor to> Ar-` . , , vey Corporation, Chicago, Ill., a corporation of Illinois _ » . ' ¿Applicàupn February 19,` 1945, serial No. 578,581 . i ‘ ’ 10mm. (ortie-’78.) » 1 2 This invention relates to toy flying machines and is more particularly concerned with toyA fly movement therewith by means of a keyk I3. The rear propeller 9 is preferably journaled on the Wheel mounting l2, and a thrust bearing I4, such as a pair of disc-shaped washers, is interposed between said propeller 9 and the Wall member l. A longitudinally extending bore I6 is formed in ther Wheel mounting l2 to receive and serve ing machines of the type provided with a pair of coaxially mounted propellers of opposite pitch adapted to be drivenin opposite directions from a single source of power, and has for an object the provision of improved means for mounting and driving the propellers for rotational move ment in opposite directions. It is a further object of this invention to pro vide means adapted to be positioned between a as a bearing for a driving shaft l1. The forward blade 8 is secured to the forward end of the driv 10 ing shaft Il and is engaged against relative ro tational movement therewith by bending the shaft laterally and thence rearwardly at I8 for offset engagement with the axis of the propeller. pair of coaxially mounted propellers for driving one of said propellers in the reverse direction re sponsive to rotational movement of the other propeller. An enlarged ñange portion I9 is formed on the 15 forward end of the Wheel mounting l2 to support y ' a plurality of wheels 2| having their axes radially disposed from the axis of the -Wheel mounting. This invention further contemplates the pro vision of a dual propeller construction which ls The wheels are preferably journaled on nails 22 which pass through 'axial openings formed in the and which may be sold either as an assembled unit or as a kit of parts for assembly by the 20 wheels for engagement with the periphery of the relatively simple and inexpensive to manufacture enlarged flange portion I9. The driving shaft Il is preferably rotated by buyer. f Itis a further object of this invention to pro vide a dual propeller construction of this type which may readily be assembled and mounted for operation on various types of flying machines such as monoplanes, biplanes, helicopters, etc. This invention embodies other novel features, details of construction and arrangement of parts which are hereinafter set forth in the specifica tion and claim and illustrated in the accompany ing drawings wherein: . Fig. 1 is a side elevational view partly in sec tion showing an airplane embodying a dual pro peller construction embodying features of this invention. ` Fig. 2 is an enlarged fragmentary longitudinal sectional view showing the dual propeller assem bly. . Fig. 3 is a sectional view taken along the line 3-3 of Fig. 2. Fig. 4 is a side elevational view, partly in sec tion, showing a modified form of this invention V25 means of ra resilient rubber band 23 having its one end connected to a hook portion 24 provided on the driving shaft Il and its other end con nected to a hook 426 secured to the rear 'end of the fuselage 6. ` Referring now more particularly to Figs. 4 and ,5, the improved dual propeller assembly is shown 30 as applied to a helicopter fuselage 3|. In this form of the invention the upper surface of the fuselage is provided with a top plate 32 formed with a centrally disposed aperture to receive the ,inner end of the wheel mounting I 2. The pro 35 pellers 33 and 34 are mounted and. arranged in the manner heretofore describedl in connection with the arrangement'and mounting of the pro pellers 8 and 9. However, the blades thereof are in the form usually provided on helicopters, As 40 the other parts forming this construction are similar to the parts heretofore described, similar numerals are applied to indicate similar parts. , In theroperation of each of the forms of this as applied to the fuselage of a helicopter. invention, the outer propeller, 8 or 33, is ñrst Fig. 5 is a plan view of same. Referring now to the drawings for a better 45 rotated manually to apply a twisting force to the resilient band 23.. When the outer propeller is understanding of this invention and more par released, the resilient band 23 acts through driv- ' ticularly to Figs. 1 to 3 therein, the improved dual ing shafts l1 to rotate the forward propeller propeller assembly is shown as applied tok an air which, in turn, acts through the wheels 2| to plane fuselage 6 provided with a propeller mount 50 drive the rear propeller in a reverse direction. ing wall 1. In the manufacture of an assembled propeller The dual propeller assemblyr comprises a pair unit, or a kit of parts adapted for sale for as of propellers 8 and 9 having blades of opposite sembly by the buyer, 'it will be observed that the pitch. An aperture ll is provided in the Wall 1 propellers, wheels, and wheel mounting 'may be of the fuselage to snugly receive a Wheel mount lng. l2 which is secured against relative rotational 55 inexpensively formed of wood or other materials 2,408,276 3 having their axes radially disposed about the axis of said idler Wheel mounting, a driving shaft journaled in said idler Wheel mounting, a front propeller secured on the outer end of said driv a kit of parts embodying the several parts of the propeller assembly, it is contemplated that each propeller may be formed in several parts for as sembly by the buyer, and that each propeller may comprise a pair of“ blades having their inner ends ing shaft for driving engagement with said fric tion- idler wheels, a rear propeller. journaled on said idler wheel mounting to be driven in a re verse direction by said friction idler Wheels, and glued or otherwise secured to a hub plate. a resilient band having its one end secured to the While this invention has been shown in but one form, it is obvious to those skilled in the art that it is not so limited but is susceptible of various changes and modifications Without departing . from the spirit and scope of -the claimed inven tion. I claim as my invention: , Y A l In a toy ñying machine, a fuselage, an idler Wheel mounting secured to said fuselage, a plu-` 4 rality of friction idler Wheels journaled upon and and that the several parts are adapted to be assembled and mounted upon either an airplane fuselage or a helicopter fuselage. In the sale of inner endy of said driving shaft and its other end secured to said fuselage, said resilient band serv ingA toA rotate thefdriving shaft and to draw the latter rearwardly to maintain the front and rear 15 propellers in operative frictional driving engage ment against diametrically opposed sides of said friction idler wheels. HARVEY E. SHAEFFER.