Patent ID: 8596598

Claim:
A booster structure of legs comprising: a support plate including four posts disposed at four corners of a bottom end thereof, wherein each post includes a hollow interior and first and second recesses defined in opposite side surfaces thereof, wherein each recess includes a vertical sliding section and a plurality of horizontal retaining sections perpendicular to the vertical sliding section; a plurality of vertical moving units, each vertical moving unit including an inner stem and an outer stem, each outer stem including a bottom cover arranged on a bottom end thereof, the outer stem and the inner stem of each one of the plurality of vertical moving units slide over one of the four posts to cover that post; a bolt element slidably inserted through a pair of aligned apertures defined in the inner stem and the outer stem of each of the plurality of vertical moving units respectively, each bolt element including a straight sliding section and an engaging section perpendicular to the straight sliding section, wherein the straight sliding section of each bolt element extends through the hollow interior of each post and engages with and slides through the vertical sliding section of the first and second recesses of each post, wherein the engaging section of each bolt element is movable between an original position with the engaging section being received in one of the plurality of horizontal retaining sections and an offset position with the engaging section being located in the hollow interior of each of the posts, wherein each bolt element further including a resilient element and a button fixed on one end thereof; and a lip secured on one side to each of the outer stem to cover at least a portion of each of the outer stem, wherein each button is disposed on another side of each of the outer stem opposite to the lip, and wherein each bolt element is forced by the button of that bolt element to slide horizontally to move from the original position to the offset position such that a portion of the bolt element is received in a recessed portion of the lip to allow each of the plurality of vertical moving units to be adjusted relative to each of the posts via sliding of the outer and inner stems of each of the plurality of vertical moving units on each post, and wherein each bolt is forced by each resilient element to return to the original position.