Patents Assigned to Tapeimp Limited
  • Inertia-sensitive device
    Patent number: 4723447
    Abstract: An inertia-sensitive device for detecting movement of, or impact on, the device or vibrations in its vicinity comprises a housing having a flat or concave surface, a ball freely supported within the housing upon that surface, the ball and/or the surface having an uneven texture, and a piezoelectric detector in direct or indirect contact with said housing. In one form of the device, which is illustrated, the surface is roughened and extends to a full spherical surface and the ball is of steel.
    Type: Grant
    Filed: March 20, 1986
    Date of Patent: February 9, 1988
    Assignee: Tapeimp Limited
    Inventor: John Laing
  • Inertia sensitive device
    Patent number: 4712098
    Abstract: An improved inertia sensitive device, which is directionally sensitive to activating impulses, comprises a piezoelectric plate (7), a housing (3,4) gripping the plate along at least a major part of its periphery, a weight (9) supported at or adjacent to the center of the plate, and means (FIG. 2) to detect signals generated by the plate (7).
    Type: Grant
    Filed: July 25, 1986
    Date of Patent: December 8, 1987
    Assignee: Tapeimp Limited
    Inventor: John Laing