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Automated height adjustable work station

  • US 5,259,326 A
  • Filed: 04/17/1991
  • Issued: 11/09/1993
  • Est. Priority Date: 04/17/1991
  • Status: Expired due to Fees
First Claim
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1. In a table having a horizontally enlarged top defining thereon a horizontally enlarged and upwardly facing worksurface, a pair of vertically elongate leg assemblies connected to said top at sidewardly spaced locations and projecting downwardly therefrom for supporting the top at selected heights above a support surface, each said leg assembly including a top leg fixed to and projecting downwardly from the top and being vertically slidable supported on a lower leg for permitting adjustment in the height of the top, and a powered drive arrangement mounted on the table and drivingly coupled to said pair of leg assemblies for permitting powered vertical displacement of said top legs to adjust the height of said top, comprising the improvement wherein:

  • said drive arrangement includes a pair of powered drive means each associated with a respective one of said leg assemblies for effecting powered vertical displacement of the top leg of the respective leg assembly, each said drive means including a low-voltage direct current electric motor and a rotary-to-linear motion converter means for effecting vertical extension and contraction of a respective said leg assembly, the rotary-to-linear motion converter means including a rotary input member which is drivingly coupled to the respective electric motor and a linearly-movable output member which is coupled to one of the legs of the respective leg assembly, the rotary-to-linear motion converter associated with each said leg assembly being free of mechanical driving connection with the motion converter of the other said leg assembly, said pair of powered drive means being operatively coupled together solely by electrical cable means for transmitting electrical energy between said motors; and

    controller means operatively coupled with the pair of drive means for simultaneously controlling the rotation of the motors of said pair of drive means for synchronizing the extension and contraction of said pair of leg assemblies, said controller means includes means for sensing when one said motor is rotating faster than the other said motor and for slowing the rotation of the faster-running motor so that it substantially equals the rotation of the slower-running motor.

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