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
Smart television system having methods or means for accessing paid or subscribed digital content from the internet
Blended block copolymer composition
Magnetic resonance imaging apparatus for use with radiotherapy
Lighting fixture
Image forming apparatus and system connectable with an authorization apparatus via a communications network, the image forming apparatus comprising an apparatus control section, an initial inq
Semiconductor device
RF amplifier with digital filter for polar transmitter
  Randomly Featured Patents
Food battering machine
Vertical PNP transistor and relative fabrication method
Microbial sulfoxidation and amidation of benzhdrylsulfanyl carboxylic acids and uses thereof
Switch device for printed circuit board and circuit structure
Low temperature dielectric deposition to improve copper electromigration performance
Transporting apparatus and method
Heat transfer device
Bed having a warming device
Device and a method for applying an even, thin fluid layer to substrates
Method of directing drilling pattern in curved tunnels, rock drilling rig, and software product