Model airplane
阅读：115发布：2024-02-28
专利汇可以提供Model airplane专利检索，专利查询，专利分析的服务。并且The model airplane is of the type formed of a thin sheet of plastic material. A propeller assembly including an engine-noisesimulating member is mounted at the forward end of the airplane. The propeller assembly is connected to a rubber band which is secured within the fuselage of the airplane and extends from the forward end thereof. The noise-simulating member is releasably mounted on the propeller assembly and includes a portion which extends into the path of rotary movement of the propeller to engage the propeller for simulating an engine noise when the propeller is rotating. Each wing of the airplane has a box-shaped strengthening spar secured to the underside thereof. Each spar has sidewalls and a bottom wall which tapers inwardly of the associated wing toward the tip of the wing. The bottom wall of each strengthening spar has a landing-gear-mounting portion for releasably holding a landing gear strut to the strengthening spar.，下面是Model airplane专利的具体信息内容。
1. In a model airplane comprising a fuselage having a forward end and a rearward end, a propeller assembly including a propeller and a spacer hub situated at the forward end of said fuselage, propeller-driving means secured to said fuselage and detachably connected to said propeller, the improvement comprising engine-noise-simulating means situated between said forward end of said fuselage and said propeller, said noisesimulating means being key shaped and having a ring portion which is detachably received on said spacer hub and a shank portion which extends radially outwardly from said ring portion, said forward end of said fuselage having a guideway for receiving said shank portion to prevent rotation of same, and said shank portion having a bent end portion, said end portion and said shank portion extending into the path of rotary movement of said propeller to engage the same for simulating an engine noise when said propeller is rotating in normal flight direction.
2. The airplane as defined in claim 1 wherein said noise-simulating means is made from a thin semirigid sheet material.
3. The airplane as defined in claim 1 wherein said noise-simulating means is made of polyvinyl chloride.
4. The airplane as defined in claim 1 wherein said bent end portion is tapered to enable said propeller to force said shank portion out of the path of movement of said propeller during reverse rotation of said propeller.
5. In a model airplane having a fuselage, left and right wings secured to, and extending from, opposite sides of said fuselage, and each of said wings having a strengthening spar, the improvement comprising each of said spars being in the form of a shallow elongated box having an opening defined by a peripheral edge portion of said box, said peripheral edge portion including a flange which extends substantially around said box and is secured to the underside of one of said wings, each of said wings having at least one locating projection at a predetermined location on said underside thereof, and said flange of each of said box-shaped strengthening spars having at least one concave locating nitcH which is adapted to mate with said locating projection on said underside of one of said wings to ensure proper positioning of each box-shaped spar on said underside of one of said wings.
6. In a flyable model airplane having a fuselage and left and right wings secured to and extending from opposite sides of said fuselage, said wings being formed from a thin sheet of plastic material, and each of said wings having a strengthening spar, the improvement comprising each of said spars being separately formed in the shape of a shallow elongated box open at the top and having sidewall portions connected to and extending from said bottom wall, and a top edge defined by the upper peripheral edge portions of said sidewall portions, and means for securing said peripheral edge portions of each of said box-shaped strengthening spars to the underside of one of said wings.
7. The model airplane of claim 6 wherein said bottom wall of each of said box-shaped strengthening spars tapers inwardly toward said underside of the wing to which said spar is attached and tapers in a direction toward the tip of said wing to which said spar is attached.
8. The model airplane of claim 6 wherein said bottom wall of each of said box-shaped spars has means thereon for releasably mounting an end portion of a landing gear strut.
9. The model airplane of claim 8 wherein said means for releasably mounting an end portion of a landing gear strut on said bottom wall includes means projecting from said bottom wall for locating said end portion of said landing gear strut in a predetermined location on said bottom wall and for releasably and firmly holding said end portion of said landing gear strut against three-dimensional movement such as side-to-side movement, fore-and-aft movement, and in-and-out movement.
10. The model airplane of claim 8 wherein said means for releasably mounting an end portion of a landing gear strut includes a yieldable holder strip portion which extends from said bottom wall and is adapted to releasably receive said end portion of said landing gear strut thereunder, said holder strip portion serving to hold said strut end portion against said bottom wall.
11. The model airplane of claim 8 wherein said means for releasably mounting an end portion of a landing gear strut includes a keeper projection which extends outwardly from said bottom wall and a stop projection which is spaced from said keeper projection and extends from said bottom wall, said keeper projection and said stop projection being located so as to receive a part of said end portion of said landing gear strut therebetween, said keeper projection preventing movement of said strut end portion in one direction and said stop projection preventing movement of said strut end portion in the opposite direction.
12. The model airplane of claim 10 wherein said means for releasably mounting an end portion of a landing gear strut includes a guide projection which extends outwardly from said bottom wall, said holder strip is disposed adjacent said guide projection, and said guide projection cooperates with said holder strip portion for preventing side-to-side movement of said strut end portion.
13. The model airplane of claim 6 wherein said peripheral edge portions of said sidewall portions of each of said box-shaped spars include flange portions which are secured to said underside of one of said wings.
14. In a model airplane comprising a fuselage having a forward end and a rearward end, a propeller including at least two blades and a hub situated at the forward end of said fuselage, propeller-driving means secured to said fuselage and detachably connected to said propeller, and means for simulating engine noise, and improvement comprising said engine-noise-simulating means being mounted for free rotation on said hub between said propeller blades and said forward end of said fuselage, said forward end of said fuselage having means for engaging said engine-noise-simulating means for preventing rotaTion of said engine-noise-simulating means when said propeller is rotating, and said engine-noise-simulating means being stiff but resilient and having a deflectable end portion which extends into the path of said propeller during rotation thereof and which is engaged and deflected by said rotating propeller upon each revolution thereof.
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