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Cam balance mechanism systems and methods

  • US 9,581,285 B2
  • Filed: 03/02/2015
  • Issued: 02/28/2017
  • Est. Priority Date: 07/30/2010
  • Status: Active Grant
First Claim
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1. A lift mechanism, comprising:

  • a base;

    a support column coupled to the base;

    a mounting portion movably coupled to the support column;

    an energy storage member coupled to the support column;

    a balance mechanism coupled to the support column and connecting the energy storage member and the mounting portion, the balance mechanism comprising;

    a first cam having a radius, a first end, a second end, and a first cam surface that winds about a first axis of rotation and between the first and second ends of the first cam, wherein the radius of the first cam decreases as the first cam surface winds between the second end and the first end of the first cam;

    a second cam having a radius, a first end, a second end, and a second cam surface,wherein the second cam is fixedly attached to the first cam,wherein the second cam winds about the first axis of rotation and between the first and second ends of the second cam,wherein the radius of the second cam decreases as the second cam surface winds between the second end and the first end of the second cam,wherein the second end of the first cam is adjacent the second end of the second cam; and

    a pulley system comprising a first cam pulley, a second cam pulley and an energy storage member pulley, wherein the first cam pulley, the second cam pulley, and the energy storage member pulley are fixedly attached to each other, and wherein the pulley system winds about a second axis of rotation that does not coincide with the first axis of rotation.

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