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Drawing table

  • US RE28,767 E
  • Filed: 06/19/1975
  • Issued: 04/13/1976
  • Est. Priority Date: 10/11/1971
  • Status: Expired due to Term
First Claim
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1. A drawing table including a stand, a board, a horizontal spindle constituting an axis rotatably mounted in the stand, a first arm mounted on the spindle adjacent each end thereof, a second arm pivotally mounted on the spindle adjacent each end thereof, each of said first arms being pivotally attached to said board, a link arm pivotally attached to each of said second arms and to said board, a compensating member having a peripheral spiral groove rotatably mounted adjacent each end of said spindle, a cable having first and second ends, said cable being attached at the first end to the compensating member and located in the spiral groove, a counterbalancing means adjustably connected to the stand, and the second end of the cable being attached to the counterbalancing means, the attachment of the cable to the compensating member in the spiral groove enabling the point of action of the counterbalancing means to vary with respect to the pivot axis during rotation of the compensating member with respect to the pivot axis, the arrangement being such that the first and second arms and the link arms connecting the board to the horizontal spindle allow the board to be adjusted in position and in which the weight of the board creates a first moment about the axis and the counterbalancing means creates a second moment about the axis, with said compensating member varying the second moment to compensate for variations in the first moment due to changes in the position of the board whereby the board is balanced in any position thereof.

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