Patents Assigned to Racal Marine Electronics Limited
  • Pendulum vibration isolator and damper
    Patent number: 4893796
    Abstract: A vibration isolator comprises a helical spring support between a base 3 and a cap 8 from which depends a pendulum rod 14 carrying at its lower end a ball joint 16. A pneumatic damper in the form of a piston 24 forms a gas compression chamber with the cap 8. A friction disc 22 encircles the pendulum rod 14. The natural resonant frequencies of the spring 11 and the pendulum may be selected to be very low, such as 4 to 5 Hertz.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: January 16, 1990
    Assignee: Racal Marine Electronics Limited
    Inventors: Derek F. Hickman, Raymond H. Boshier