Importance

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Abstract

A lift mechanism is provided with a lower bracket to be attached to a base, a lower support arm and a lower drive arm each pivoted at one end thereof to the lower bracket, an intermediate bracket for pivotally supporting free ends of the two arms at respective positions at equal distances from the pivoted positions of the arms on the lower bracket with the arms in parallel to each other, a lift control apparatus disposed on the intermediate bracket and having a movable member retractably projectable in a direction parallel to the base, an upper support arm and an upper drive arm pivoted each at one end thereof to the intermediate bracket at respective positions symmetric with the pivoted positions of the lower support and drive arms with respect to the lift control apparatus, an upper bracket for pivotally supporting the other ends of the upper support arm and the upper drive arm, and a pair of traction members attached each at one end thereof to an outer end of the movable member of the lift control apparatus and connected at the other ends thereof to respective mount portions formed on the lower drive arm and the upper drive arm at their ends pivoted to the intermediate bracket.

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First Claim