Patents Assigned to ALH Systems, Ltd.
  • Mole with rotary vibrator
    Patent number: 4705116
    Abstract: A ground boring tool known as a mole is fitted within its conical head (1) with a pneumatic-powered rotatory vibrator (8) which generates severe radial vibrations. As a result the progress of the mole through resistant ground is speeded or made possible. The mole also may be used for upgrading existing ducts with or without the destruction of an existing lining to such ducts. For destruction of existing linings elongate ridges (16) may be positioned on the surface of the cone.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: November 10, 1987
    Assignee: ALH Systems, Ltd.
    Inventor: Alec R. Carruthers