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Mechanically counterbalancing platform

  • US 4,872,628 A
  • Filed: 12/07/1987
  • Issued: 10/10/1989
  • Est. Priority Date: 12/07/1987
  • Status: Expired due to Term
First Claim
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1. An instrument supporting platform system comprising, in combination, a base, an elongated platform having front and rear portions, and linkage means connecting the platforms and said base for defining a predetermined tilting movement of the platform both up from the horizontal, causing the front portion of the platform to rise, and down from the horizontal, causing the rear portion of the platform to rise, said linkage means further including means for defining predetermined paths of travel whether the platform is tilted up or down from the horizontal to cause the center of the platform to rise sufficiently far to cause a point at a fixed perpendicular distance from the top of the platform to maintain a substantially absolute vertical height and to raise slightly as the platform is increasingly tilted, said point corresponding substantially to the center of gravity of an instrument supported on said platform, whereby the instrument supported on said platform is automatically substantially counterbalanced by gravity at any position of the platform relative to the horizontal when the platform is tilted up from the horizontal and when the platform is tilted down from the horizontal.

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