Patents by Inventor Trevor Evelyn Wallace

Trevor Evelyn Wallace 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).

  • Telescopic rock drill mounting
    Patent number: 4066135
    Abstract: A known triangular rock drill mounting comprising a drill feed leg pivoted to a vertical support with an adjustable counterbalancing arm is modified. The counterbalancing arm is a piston and cylinder fed with compressed air. The admission of compressed air is controlled by a valve with an actuating handle. The valve is so constructed that when a given triangular configuration is reached, constant pressure is restored in the cylinder by means of negative feed-back.
    Type: Grant
    Filed: January 30, 1976
    Date of Patent: January 3, 1978
    Assignee: The Steel Engineering Company
    Inventor: Trevor Evelyn Wallace
  • Mounting for rock drills
    Patent number: 4000873
    Abstract: A known extendable and retractable mounting for rock drills is described comprising a drill feed leg, a vertical support, which may be mounted on a truck and a counter-balancing device for counterbalancing the drill during movement vertically from one drilling position to another. The new feature described consists in applying a turning moment to the vertical support by means of a spring, two springs or a fluid cylinder and piston arrangement. The turning moment counteracts a resultant force tending to move the feed leg sideways.
    Type: Grant
    Filed: February 12, 1976
    Date of Patent: January 4, 1977
    Assignee: The Steel Engineering Company Limited
    Inventor: Trevor Evelyn Wallace