Патент USA US2128009код для вставки
Patented Aug. 23, 1938 ' . 2,128,009 UNITED STATES PATENT OFFICE 2,128,009 MODEL AIRPLANE PROPELLER Frank J. Merz, Jr., and George B. Merz, Seattle, Wash. Application September 20, 1937, Serial No. 164,663 1 Claim. (01. 170-173) Our invention relates to model airplane propellers, and more particularly to a miniature airplane propeller that is transversely severed at its central hub portion, together with means 5 for securing the two severed parts together in the form of a butt joint at the center of the hub. The objects of the invention, in making a propeller in equal parts that are secured together by a butt joint at the center of the hub, are that, 10 when one of the propeller blades is broken, same may be replaced at less expense than would be one of which-is shown in elevation at 9 in Fig. 2 of the drawing. When the two parts of the pro peller are joined, these two faces are placed or ?tted together to form a butt joint at 8 as will be understood. The usual hole In extends cen- 5 trally through the hub portion 1, half of same being in each severed part of the hub. Said hole forms a journal bearing for a propeller shaft H which extends forward from the nose l2 of a model airplane which is not shown. 10 The simple means for securing the two severed incurred by replacement of the entire propeller. In order to completely effect this saving of ex- parts of. the propeller hub 1 together is the most important part of the invention. Said means pense, we have devised a simple, effective and 15 inexpensive means for securing together the severed parts of the propeller. It will be expressly understood that our invention is solely intended for use in connection with model and toy or other miniature airplanes ‘~30 or propellers. It is not intended for use on full size propellers and would doubtless be of. no practical value or utility for such use. Model and toy airplane propellers are usually made of wood or light metal such as aluminum, and the objects 25 of our invention relate exclusively to such pro~ pellers. It will also be understood that model airplanes are miniature planes that are ?own by youngsters as a source of amusement and skill, and asaving of money, although small in amount, 30 means much to them. In the drawing: Figure 1 is a view in front elevation of a model or toy airplane propeller ‘that is severed and connected together at its center, and also showing 35 one of the propeller blades broken away in dotted lines; Fig. 2 is a view in central transverse vertical section taken substantially on a broken line 2-2 of Fig. 1; and 40 Fig- 3 is a detail View in Perspective Showing may consist of a pair of disc plates l3 each having an annular ?ange l4 extending at right angles 5 from its periphery. A hole I5 is centrally pro vided in each disc plate for reception of the shaft II. The hub 1 has an annular groove l6 cut in both its front and rear sides concentric With the hole I0, half of said groove being disposed in 20 each severed part of. the hub. These grooves are adapted to snugly receive the ?anges M of the disc plates I3. In the assemblage of the severed parts of the propeller, their severed faces 9 are placed to- 25 gether in abutment. The ?anges M of each of the disc plates l3 are then inserted into the an nular grooves IS in both the front and rear sides of the hub ‘I. The disc plates are both pressed inward, their ?anges snugly ?tting into 30 the grooves, and the two parts of the propeller are thus held securely together. The propeller may then be installed on the shaft II with the rear disc plate [3 bearing against an annular shoulder l1 formed on said shaft, and. a nut I8 35 may be installed on the outer threaded end of the shaft and bearing against the front disc plate l3 as clearly shown in Fig. 2 of the drawing. We claim: An article of manufacture comprising a mini- 40 one member of the securing means. ature propeller having a hub with a center hole Referring in detail to the drawing wherein like reference numerals indicate like parts in the several views, the numerals 5 and 6 respectively therein, said hub centrally and transversely severed to form equal parts with abutting faces ?tted together, a groove formed around the hole 45 designate the two blades of a model or toy air- in the hub on both the front and rear sides 45 plane propeller. These two blades are joined together at their center hub portion 1 which is severed centrally and transversely as shown at 8 in Fig. 1. The propeller may either be made as a single unit and severed afterward, or it may be made in two equal parts originally as desired. When the hub portion 1 of the propeller is severed centrally, two equal faces are formed, thereof, a pair of plates each having a right angular edge ?ange, and the ?ange of each plate ?tting into the groove of the hub on each of its respective sides for the purpose of securing the severed parts of the propeller together in the form 50 of a butt joint and as a unit in itself. FRANK J. MERZ, JR. GEORGE B. MERZ.