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
Liquid formulation for deferiprone with palatable taste
System, method and computer-readable medium for provisioning dual-homed voice call continuity
Focusing and sensing apparatus, methods, and systems
Mining phrases for association with a user
Flash memory device and method of programming same
System and method for transparently authenticating a user to a digital rights management entity
Multi-layer stretched film
  Randomly Featured Patents
Device for reducing starting load on internal combustion engine
High efficiency ion exchanges system for removing contaminants from water
Motor control for a stepping motor
Barbeque grill ash collector
Method and apparatus for encoding low redundancy check words from source data
Composition for lowering blood cholesterol
Prosthesis substructure
Methods and systems for color preservation with a color-modulated backlight
Powder coating booth with a cleaning device and method
Actuator using a piezoelectric element