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Counterbalance mechanism

  • US 4,953,256 A
  • Filed: 02/06/1989
  • Issued: 09/04/1990
  • Est. Priority Date: 02/06/1989
  • Status: Expired due to Fees
First Claim
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1. A counterbalance mechanism comprising:

  • means for guiding a movable portion of an apparatus along a vertical or inclined path;

    shaft means disposed between stationary sides of said apparatus for providing a force to counter a force of gravity on said movable portion;

    means for transferring said force to said movable portion in a constant manner independent of said movable portion position, said force transferring means comprises spiral gears disposed on a first end and a second end of said shaft means; and

    rack gears attached to said movable portion guiding means in a vertically oriented position, each of said rack gears positioned to engage one of said spiral gears.

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