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Vibration damping apparatus

  • US 5,881,987 A
  • Filed: 04/01/1997
  • Issued: 03/16/1999
  • Est. Priority Date: 04/02/1996
  • Status: Expired due to Term
First Claim
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1. A vibration damping apparatus, provided between an upper apparatus and a mounting floor, supporting the upper apparatus, said vibration damping apparatus comprising:

  • at least four air springs for supporting the upper apparatus;

    pressure control means for controlling air pressures of said air springs by changing amounts of air in said air springs, so as to dampen vibration from the mounting floor to the upper apparatus, and suppress vibration of the upper apparatus; and

    air communicating means for mutually passing air between at least one couple of the air springs among said air springs, said air communicating means comprising an air valve, positioned in a path of the air flow in said air communicating means, for controlling air flow through said air communicating means, whereby the difference of the air pressure between said at least one couple of the air springs is equalized by passing air through said air communicating means by the opening of said air valve, thereby creating an equilibrium of air pressures between said at least one couple of air springs.

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