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US 4,728,311 AGranted
Toy helicopter
OwnerRonald G. Magersinventor
Life of this patent
Estimating the term…
Abstract
A toy helicopter is provided having a rotor that gradually accelerates to simulate the start-up of a full-scale helicopter, wherein the gradual acceleration is induced by frictional interaction between the surface of a drive shaft and the surface of a bore formed in the rotor hub. Actuation is accomplished by lifting an actuating shaft which extends from the rotor hub and drive shaft to activate a motor; returning the actuating shaft to its resting position deactivates the toy. The toy also provides a flashing light and audio mechanism to further simulate the operation of a full-scale helicopter.
Claims13
A toy comprising:
- a body;
- a motor having a rotating shaft with a pinion gear mounted on its distal end;
- a switch for actuating said motor;
- a gear assembly in mesh with said pinion gear, said gear assembly comprising at least one gear;
- a tubular drive shaft projecting from the central portion of said at least one gear;
- a rotor having a hub with a bore formed therein, said rotor mounted on and loosely frictionally engaging said drive shaft;
- an actuating shaft passing through said rotor hub and within said tubular shaft and through the central portion of said at least one gear;
- an actuating arm operatively associated at one end with the internally projecting end of said actuating shaft, said actuating arm operatively associated at said arm's other end with said switch;
- whereby axial movement of said actuating shaft actuates said motor to induce rotation of said tubular drive shaft to thereby induce gradual rotational acceleration of said rotor as a result of frictional interaction between cooperating surfaces of said drive shaft and said rotor hub.
6 more elements
A toy comprising:
- a body;
- a motor having a rotating shaft with a pinion gear mounted on its distal end;
- a switch for actuating said motor;
- a gear assembly in mesh with said pinion gear, said gear assembly comprising at least one gear;
- a tubular drive shaft projecting from the central portion of said at least one gear;
- a rotor having a hub with a cylindrical bore formed therein, said rotor mounted on and loosely frictionally engaging said tubular drive shaft;
- an actuating shaft passing through said rotor hub and within said tubular drive shaft and through the central portion of said at least one gear, said actuating shaft having an end cap on its externally projecting end;
- an actuating arm operatively associated at one end with the internally projecting end of said actuating shaft, said actuating arm operatively associated at the arm's other end with said switch so that axial movement of said actuating shaft actuates said motor to induce rotation of said tubular drive shaft;
- carrying means for grasping said end cap;
- whereby axial movement of said actuating shaft actuates said motor to induce rotation of said tubular drive shaft and gradually accelerate said rotor as a result of frictional interaction between the cooperating surfaces of said tubular drive shaft and said cylindrical bore.
7 more elements
A toy comprising:
- a body;
- a motor;
- a switch for actuating said motor;
- a tubular drive shaft operatively associated with said motor;
- a rotor having a hub with a bore formed therein, said rotor mounted on and loosely frictionally engaging said drive shaft;
- an actuating shaft passing through said rotor hub and within said tubular drive shaft;
- an actuating arm operatively associated at one end with the internally projecting end arm operatively associated at said arm's other end with said switch;
- whereby axial movement of said actuating shaft actuates said motor to induce rotation of said tubular drive shaft to thereby induce gradual rotational acceleration of said rotor as a result of frictional interaction between the cooperating surfaces of said drive shaft and said bore.
5 more elements
Dependencies are inferred from the claim text.