Manufacturing method of sliding unit of sliding rail and structure thereof

Abstract

A manufacturing method and structure of hidden slide's slide unit, which the slide unit sets between upper and lower rail bars. The slide unit is made by long-plate-shaped substrate, which has the following steps: preliminary forming, pressure bending and rolling forming. First, preliminary forming and pressure bending can make substrate a prototype, then rolling forming can make substrate become a slide unit and the slide unit can be squeezed and concentrated. Therefore, the density of the slide unit structure is increased to enhance the strength of structure, which can avoid the slide be deformed, insure the operation quality of hidden slide can slide out smoothly, increase service life, decrease manufacturing cost, and have better economic benefit.

What claimed is: 
     
         1 . A method of manufacturing a slide unit of a hidden rail comprising steps of: (i) preliminary forming, (ii) pressure bending and (iii) rolling forming,
 wherein the step of preliminary forming includes steps of bending an upper end and lower end of a substrate to form a bent portion, and forming a supporting portion in a middle portion of the substrate,   wherein the step of pressure bending includes steps of shaping the bent portion to a reverse S shape, and forming the bent portion a closed arc closely attaching to the supporting portion,   wherein the step of rolling forming includes a step of squeezing the substrate to increase the density of bent portion and supporting portion to further enhance the strength of the slide unit,   wherein the two bent portions are squeezed to two sliding portions, and two outside portions of the sliding portions form two symmetric outer chutes, and two inner portions of the sliding portions form two inner chutes.   
     
     
         2 . A method of manufacturing a slide unit of a hidden rail of  claim 1 , wherein the slide unit is disposed between an upper and a lower rail bar, and the slide unit is integrally molded, and the slide unit has two sliding parts corresponding to the upper rail bar and lower rail bar, wherein a support part is formed between two slide parts, and two outer grooves are recessedly and symmetrically formed outside the slide parts, and two inner grooves inside the slide parts extending towards the supporting part. 
     
     
         3 . A method of manufacturing a slide unit of a hidden rail of  claim 1 , wherein, both the upper rail bar and lower rail bar have a channel, and one side of which bends inward to form a restricting portion.