Patent ID: 8733508
Filing Date: 2014-05-27
Classification: B66B,B66F

Abstract:
1. A lift assembly comprising: a base; a platform, said lift assembly having extended and contracted states, said platform at a greater distance from said base in said extended state than in said contracted state; a pair of scissor arms each having opposed first and second ends with said scissor arms being pivotably connected to each other about a central axis located between respective first and second ends, said first end of each scissor arm being coupled to said base and said second end of each scissor arm being coupled to said platform; a drive screw mechanism comprising a shaft defining a longitudinal axis, a drive motor rotatably coupled to said shaft, a block threadedly engaged with said shaft and having longitudinal movement relative to said shaft urged by rotation of said shaft, and a collar relative to which said shaft is rotatable, said collar longitudinally fixed relative to said shaft; and first and second pairs of links with each link having opposed first and second link ends and an edge extending between said first and second link ends, with said edge facing away from said central axis and defining a recess in said link; said collar and said block each spaced from said central axis and indirectly coupled to both of said scissor arms through said first and second pairs of links, each of said links of said first and second pairs of links being crossed between said first and second link ends, and each link of said first pair of links is pivotably attached to said collar at said first link end and pivotably attached to one of said scissor arms at said second link end, and each link of said second pair of links is pivotably attached to said block at said first link end and pivotably attached to one of said scissor arms at said second link end.