Patents by Inventor Bert Stahl

Bert Stahl 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).

  • Method of and apparatus for controlling diamond drill feed
    Patent number: 6209662
    Abstract: Apparatus for controlling a diamond drill feed cylinder which includes a linear position sensor coupled to the feed cylinder for generating a position signal, a positioning module for generating a feed control signal in dependence upon the position signal, a proportional flow control valve having two hydraulic ports for connecting to the feed cylinder and responsive to the feed control signal for controlling flow rate of the two hydraulic ports, a plurality of operation sensors coupled to the diamond drill for generating operation status signals, a plurality of input modules for receiving the operation status signals and converting them to digital operation status signals and a programmable logic controller connected to the plurality of input modules for modifying the feed control signal in dependence upon the digital operation status signals. The rate of penetration of the diamond drill is controlled by controlling the flow rate applied to the feed cylinder.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: April 3, 2001
    Assignee: Atlas Copco Canada Inc.
    Inventor: Bert Stahl