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
Imaging device, method and computer readable medium
Leg stretching device
Adaptive contact window wherein the probability that an answering user/expert will respond to a question corresponds to the answering users having response rates that are based on the time of
Fluid pressure responsive electric switch
Optical sensor and electronic apparatus
System and method for displaying a constant time selection context menu interface
Vacuum switch and electrode assembly therefor
  Randomly Featured Patents
Alkaline direct methanol fuel cell
Process for continuous production of organic carbonates or organic carbamates and solid catalysts therefore
Lance and slit seamed housing and method of manufacture
Electronic device, semiconductor device using same, and method for manufacturing semiconductor device
Track or method for aligning a rail track section
Peptide derivatives of cytochrome b.sub.558 and their use as medicaments
Method for manufacturing dialkylaluminum monohalide
Card-holding/locking device for the securing/latching of a printed circuit card/board
Speech recognition system with display information
Vertical cable manager