Accession Number : ADD004202
Title : Automatic Blade Angle Controller System.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Ward,Carter J ; Huang,Kwang-Ta ; Byrd,George W
Report Date : 24 May 1977
Pagination or Media Count : 8
Abstract : An automatic blade angle controller system capable of maintaining a blade on an earth-working tool level with the ground is described. A transparent, closed manometer partially filled with an opaque liquid is contained in an opaque enclosure. A light source is located within the perimeter of the manometer. Two solar cells are located on opposite sides of the enclosure in such manner that the light from the light source must pass through the manometer before impinging on the solar cells. The opaque liquid partially blocks the light from impinging on the solar cells. The voltages from the solar cells are subtracted resulting in an error signal. Of course, when the two voltages are of equal value, no error signal is produced, thereby establishing a level reference position for the enclosure. The enclosure is rigidly affixed to the blade, thereby establishing a reference position for the blade. A servo-hydraulic system returns the blade to its reference position upon receipt of the error signal.
Descriptors : *Patents, *Blades, *Earth handling equipment, *Control systems, *Servomechanisms, Automatic, Errors, Position(Location), Corrections, Solar cells, Manometers
Subject Categories : Electrical and Electronic Equipment
Construction Equipment, Materials & Supplies
Distribution Statement : APPROVED FOR PUBLIC RELEASE