CPC B64C27/54

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CPC B64C27/54 is a patent classification for Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement.[1][2]

Aero classification issue: Most of the patents in this area in the 19th century are focused on marine propulsion, and often on paddle-wheels. Some of these are aero-relevant and others not. We have to use judgement, when choosing Relevance=0, .5, or 1, and it's not always clear. Let's get good at it. If the patent makes reference to aero issues, it's probably relevant. If it refers to water-buckets, it probably isn't. A paddle-wheel pushes slowly against the fluid, which isn't relevant for aero; a water-wheel can't move nearly as fast as a aerial propeller has to, and there is no meaningful "lift", and "drag" is different.

Classification tree:

  • CPC B64C27/00: Rotorcraft; Rotors peculiar thereto (alighting gear CPC B64C25/00)
    • CPC B64C27/20: Rotorcraft characterised by having shrouded rotors, e.g. flying platforms
    • CPC B64C27/32: Rotors (features common to rotors and propellers B64C11/00)
    • CPC B64C27/54: Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement
      • CPC B64C27/56: characterised by the control initiating means, e.g. manually actuated
      • CPC B64C27/58: Transmitting means, e.g. interrelated with initiating means or means acting on blades (means acting on blades B64C27/72)
      • CPC B64C27/72: Means acting on blades
      • CPC B64C27/78: in association with pitch adjustment of blades of anti-torque rotor
      • CPC B64C27/80: for differential adjustment of blade pitch between two or more lifting rotors

References

  1. ↑ CPC B64C27/54 element at Espacenet web site
  2. ↑ CPC B64C27/54 element listed at USPTO

This wiki has 70 patents in category "CPC B64C27/54".

Patents in category CPC B64C27/54


Enclosing categories CPC B64C27/00
Subcategories CPC B64C27/56, CPC B64C27/58, CPC B64C27/70, CPC B64C27/72, CPC B64C27/78
Keywords Propellers, marine propulsion
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