Helicopter

  • US 7,467,984 B2
  • Filed: 08/21/2007
  • Issued: 12/23/2008
  • Est. Priority Date: 01/19/2006
  • Status: Expired due to Fees
First Claim
Patent Images

1. A remote control toy helicopter comprising a body with a tail;

  • a motor and a battery for the motor, the motor being controllable by a controller remote from the helicopter body;

    a main rotor with propeller blades which is driven by a rotor shaft on which the blades are mounted;

    a tail rotor which is driven by a second rotor shaft directed transversally to the rotor shaft of the main rotor, an auxiliary rotor driven by the rotor shaft of the main rotor for rotation in the sense of rotation of the main rotor, the auxiliary rotor being mounted such that the generally longitudinal axis of the auxiliary rotor in the sense of rotation, is located at an angle relative to a generally longitudinal axis of one of the propeller blades of the main rotor, and wherein the generally longitudinal axis of the auxiliary rotor is along a center line of the auxiliary rotor passing to the rotor shaft, and the generally longitudinal axis of one of the propeller blades of the main rotor is determined from an end area of the blade to the rotor shaft, and the angle is less than about 25 degrees, and preferably about 10 degrees, and wherein the auxiliary rotor is mounted in a swinging relationship on an oscillatory shaft and the swinging motion being relatively upwardly and downwardly about the oscillatory shaft, and which oscillatory shaft is provided essentially transverse to the rotor shaft of the main rotor, such that the swinging motion of the auxiliary rotor controls the angle of incidence of at least one of the propeller blades of the main rotor, and a joint of the main rotor to the propeller blade formed of a spindle which is fixed to the rotor shaft of the main rotor, the spindle being directed substantially parallel to the generally longitudinal axis of at least one of the propeller blades of the main rotor, the blades being a relatively rigid structure essentially from the end area of one blade through an area adjacent to the rotor shaft to the end area of an opposite blade.

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