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Helicopter with main and auxiliary rotors

  • US 8,052,500 B2
  • Filed: 11/25/2008
  • Issued: 11/08/2011
  • Est. Priority Date: 11/25/2008
  • Status: Active Grant
First Claim
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1. A remote control toy helicopter comprising:

  • a body;

    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, and a joint of the main rotor being a spindle which is fixed 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;

    a second rotor which is driven by a second rotor shaft;

    the auxiliary rotor being provided with two vanes extending essentially in a line with their longitudinal axis, the auxiliary rotor being mounted in a swinging relationship on an oscillatory shaft which is provided essentially transversally to the rotor shaft of the main rotor and being directed essentially transversally to the longitudinal axis of the vanes;

    the main rotor and the auxiliary rotor being connected to each other by a mechanical link, such that the swinging motion of the auxiliary rotor controls the angle of incidence of at least one of the rotor blades of the main rotor; and

    an actuator for engaging with a control assembly depending from the auxiliary rotor, wherein the actuator includes at least a portion of a cam outer engaging surface, the cam being mounted about the rotor shaft, and an actuator arm being engagable with the cam, the actuator arm being movable between different positions thereby to move the cam into different relative positions about the rotor shaft, such that the control assembly of the auxiliary rotor engages the cam in different positions of engagement, an inter-engagement of the cam and a first element of the control assembly effecting a change in the angle of incidence of at least one vane of the auxiliary rotor, the first element engaging through an interface with the cam, at least one of the first element or cam has a curved face interface, and the first element and cam being for sliding engagement, the action of the cam being for movement between non-tilted and tilted positions relative to the rotor shaft and the first element, wherein the cam retains contact with the first element, and the first element contacts different portions of the cam for different positions of relative tilt of the cam.

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