Patents by Inventor by Barbara E. Bennett, personal representative

by Barbara E. Bennett, personal representative 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).

  • Patent number: 4641388
    Abstract: A hydraulically operated dockboard comprising a ramp which is hinged at its rear edge to the frame of the dockboard, and a lip is hinged to the forward edge of the ramp. A main hydraulic cylinder unit connects the frame and the ramp, and by operating the cylinder unit the ramp can be pivoted upwardly from a horizontal cross traffic position to an upwardly inclined position. A lip cylinder interconnects the ramp and the lip and acts to pivot the lip from a downwardly hanging pendant position to an extended position. A hydraulic line is connected to the lip cylinder, and a control valve interconnects the hydraulic line to either a supply line or a return line that is connected to the reservoir of the hydraulic system. The control valve is normally biased to a first position where the lip cylinder is connected to the return line.
    Type: Grant
    Filed: August 1, 1984
    Date of Patent: February 10, 1987
    Assignee: Kelley Company, Inc.
    Inventors: David E. Bennett, deceased, by Barbara E. Bennett, personal representative