Screw actuated scissor jack with a self adjusting bearing surface
OwnerWarren Edward Stickle, Jr.inventor
Life of this patent
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Abstract
There is disclosed a scissor-type screw actuated jack arrangement having a floating load bearing plate centrally situated over supporting lift arms when in the fully extended position and a pair of facing U-shaped channel members coupled to opposite ends of the lift arms for carrying the bearing plate and screw.
Claims3
A scissor jack arrangement comprising a pair of facing plate members relatively movable toward and away from each other, pairs of arms pivotally joined at their respective midsections and at their rearward lower and upper ends to ends of said plate members, forward ends of said pairs of arms being slidably joined to each of said facing plate members through an elongated slot opening associated therewith, an axle running transverse to said pairs of arms and slidably connected to each forward lower end of each of said arms, a threaded plate at an end opposite to where said rearward arm is pivotally joined to a lower one of said plate members, a threaded shaft being threaded into said threaded plate and fixedly secured to said axle for movement of forward and rearward ends of said respective arms toward and away from each other, a floating loadbearing platform slidably mounted on a top one of said plate members for movement longitudinally therealong, and said platform includes downwardly extending securement pins interfitted with elongated apertures in said top plate member situated substantially centrally between said pair of arms, and lubricating strips running longitudinally between said top plate member and said platform for self-lubricating movement of said platform.
A scissor jack assembly comprising an upper load-bearing plate member and a lower plate member joined by a pair of collapsible scissor structures;
- each of said scissor structures including a pair of arms pivotally joined at their respective midsections, end sections of said arms on each of said structures being pivotally joined to rearward sections on said bearing plate member and said lower plate member, and opposite end sections of said arms on each of said structures being slidably joined to opposite plate members;
- a threaded shaft being fixedly secured to the opposite end sections of said arms on each of said structures;
- a mating threaded member secured to said lower plate member for relative movement of said bearing plate member with respect to said lower plate member as said threaded shaft is turned engaged in said mating threaded member;
- a floating load bearing platform slidably mounted on said load-bearing plate member for restricted movement therealong;
- and
- lubricating strips between said upper load-bearing plate member and said platform for self-lubricating movement of said platform.
Dependencies are inferred from the claim text.