Resources Contact Us Home
Valve actuator differential worm planetary gear drive

Image Number 3 for United States Patent #4896562.

A valve actuator differential worm planetary gear drive provides forward or reverse motion to a valve stem, from an input from either a motor-driven worm or a handwheel driven worm, by using a plurality of planet gears to send motion to the sun gear. If the preference is to have the motor driven the valve primarily, the manual worm stays locked and the motor worm acts as a planetary arm. When it is desired to move the valve by hand, the motor gear is fixed and rotation of the handwheel worm gear transmits the power through the ring gear and the planet gears to the drive sleeve.

  Recently Added Patents
Television apparatus
Spacers for insulated glass units
Matching engine for comparing data feeds with user profile criteria
Live-attenuated compositions for bacterial infections
Three-term predictive adder and/or subtracter
Touch-sensitive device and communication device
Method of patterning color conversion layer and method of manufacturing organic EL display using the patterning method
  Randomly Featured Patents
Device for monitoring surroundings of vehicle
Field emission cold cathode having micro electrodes of different electron emission characteristics
DX JPEG Huffman decoder
Apparatus for surveillance of bus-bar temperature
Temperature therapy apparatus
Imaging apparatus and imaging control method
Melanocortin receptor agonists
Method and apparatus for extracting carbon dioxide from air
Vent stack screen for portable toilet holding tanks