Patents by Inventor Charles S. Kelley

Charles S. Kelley has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Automatic grab crane
    Patent number: 4053999
    Abstract: A time saving automatic hydraulic control for that sequence in operations in which a grab excursioning out of sight of the operator, is sequentially lowered open to engage work material, closed to pick up a load, and then hoisted with its load and emptied. A logic circuit is activated to stop the lowering within an adjustable timed period after initial work engagement to provide desired penetration of the work material by the grab followed by a minimal time for grab closing to provide an adjustable constancy of loads and a positive sequential control for the lowering and hoisting modes.
    Type: Grant
    Filed: May 20, 1976
    Date of Patent: October 18, 1977
    Inventors: Charles S. Kelley, James A. Westlund
  • Automatic grab bucket with pressure responsive solenoid control
    Patent number: 4047311
    Abstract: A time saving automatic hydraulic control for that sequence in operations in which a grab excursioning out of sight of the operator, is sequentially lowered open to engage work material, closed to pick up a load, and then hoisted with its load and emptied. A hydraulic-electrical control is activated to stop the lowering of the grab within an adjustable timed period after initial work engagement to provide desirable penetration of the work material by the grab followed by a minimal time for grab closing to accomplish an adjustable constancy of loads as well as positive sequential control for the lowering and hoisting modes.
    Type: Grant
    Filed: May 20, 1976
    Date of Patent: September 13, 1977
    Inventor: Charles S. Kelley
  • Automatic grab crane
    Patent number: 3967394
    Abstract: A time saving automatic hydraulic control for that sequence in operations in which a grab excursioning out of sight of the operator, is sequentially lowered open to engage work material, closed to pick up a load, and then hoisted with its load and emptied. A logic circuit is activated to stop the lowering within an adjustable timed period after initial work engagement to provide desired penetration of the work material by the grab followed by a minimal time for grab closing to provide an adjustable constancy of loads and a positive sequential control for the lowering and hoisting modes.
    Type: Grant
    Filed: September 23, 1974
    Date of Patent: July 6, 1976
    Inventors: Charles S. Kelley, James A. Westlund