Patents Assigned to Mining Developments Limited
  • Earth working machine having independent tools and roof engaging bridge
    Patent number: 4098538
    Abstract: A mobile earth working machine has a tracked base on which various tools such as an impactor hammer and a side delivery bucket are mounted on separate booms.To permit two or more tools to be used simultaneously, while tunnelling, a locking or clamping arrangement is provided on the machine which is operational when the machine is stationary and braked to clamp to machine between floor and roof. The locking arrangement is a bridge structure preferably mounting three ram-movable clamp plates.
    Type: Grant
    Filed: April 13, 1977
    Date of Patent: July 4, 1978
    Assignee: Mining Developments Limited
    Inventor: Allan Richard Hilton