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
Mobile communication device
Image processor
Imaging lens with three lens elements, and electronic apparatus having the same
Dynamically updating privacy settings in a social network
Method and system for coding an information signal using closed loop adaptive bit allocation
Compact light shield for flash photography
Apparatus and method for recording reboot reason of equipment
  Randomly Featured Patents
Pair facsimile devices
Process for making 3,5-dialkyl-4-hydroxybenzyl-substituted aromatics
Optical fiber-delay line buffers with void filling
Sample masking in ellipsometer and the like systems including detection of substrate backside reflections
Phase-locked loop
System and method for computing car switching solutions in a switchyard using car ETA as a factor
Fence panel including a connector system for interconnecting multiple panels
Method for producing seamless steel pipe
Regenerative control apparatus of electric vehicle, which obtains regenerative torque for brake from motor for running