Resources Contact Us Home
Control device for a swing

Image Number 3 for United States Patent #7905791.

Various embodiments of the invention include a motor system for driving a swing and controlling the speed and/or amplitude of the swing. In one embodiment, the motor system includes a DC motor, a swing velocity sensor system, and a swing velocity control circuit. The DC motor drives the swing through at least one fill swing cycle, and then the motor is allowed to free-wheel for at least a half swing cycle. During the free-wheeling half cycle, the swing velocity sensor system measures the velocity of the swing and compares the measured velocity to a goal velocity. The control circuit increases or decreases the velocity depending on this comparison. In other embodiments, the system includes a swing amplitude sensor system that measures the amplitude of the swing and a swing amplitude control circuit that compares the measured amplitude to a goal amplitude.

  Recently Added Patents
Display screen or portion thereof with icon
Magnetic reading and writing device
Modified polyolefin resin for glass fiber treatment, surface-treated glass fiber, and fiber-reinforced polyolefin resin
Gangable electrical box and leveling assembly
Semiconductor device and method for manufacturing the same
Microwavable bag
  Randomly Featured Patents
Method and apparatus for synchronizing facsimile transmissions
Worm gear apparatus
Method for the iontophoretic non-invasive determination of the in vivo concentration level of an inorganic or organic substance
Apparatus for detecting properties of sheet material
Beverage cooler
Laser marking of fluoropolymer composition
Method of producing activated carbons from petroleum heavy materials in a reaction solvent with a sulfonating agent
Image processing apparatus with function of extracting visual information from region printed in dropout color on sheet
Electronic apparatus
Tracking device