Patent ID: 6334605
Filing Date: 2002-01-01
Classification: B66F,Y10S

Abstract:
A pantagraph-type jack in which outer ends of a pair of lower arms disposed in a V-shaped manner whose inner ends are swingably connected to a base and outer ends of a pair of upper arms disposed in an inverted V-shaped manner whose inner ends are swingably connected to a load bearing platform are connected via first and second connecting shafts, and a threaded rod supported on the first connecting shaft in a rotatable but axially non-movable manner is screwed into a threaded bore provided in said second connecting shaft, wherein said base comprises an upper base member and a lower base member which are connected to each other relatively movably in a vertical direction, inner ends of said pair of lower arms are swingably connected to the upper base member via a pair of lower pivots arranged in a horizontal direction, lower sector gears are formed on outer peripheries of the inner ends of said two lower arms, and a lower rack which meshes with said lower sector gears is disposed in the vertical direction and secured on said lower base member.