Combination of cushion column and screw

Abstract

The invention aims at providing a combination of a cushion column and a screw, which is used for solving a problem of repeatedly detaching and fixing the screw caused by failure in exactly locating the cushion column with a mounting hole of a printed board while assembling modules. The screw provided by the invention passes through a through hole at the middle axis of the cushion column, the through hole is axially divided into a section a and a section b, the section a located at the upper part comprises an internal thread while the section b located at the lower part is an unthreaded hole, and axial length of the section a is L; inner diameter of the unthreaded hole of the section b is H, and width of the inner thread of the section a is w, namely, practical equivalent inner diameter of the section a is h which is less than or equal to H-2w; the threaded rod of the screw is also axially divided into a section c and a section d with different external diameters, the section c adjacent to one end of a nut is an unthreaded rod, the external diameter of the section c is n which is less than h, the axial length of the section c is G which is more than L, and the whole part of the section d or a part of the section d adjacent to the tip of the screw has an external thread matched with the internal thread of the section a. With the combination of the cushion column and the screw provided by the invention, exact location of a central hole of the cushion column with the mounting hole of the printed board is implemented, and assembling efficiency of the modules is improved.

Description

technical field [0001] The invention relates to an assembly assembly that needs to add cushion columns for module assembly, in particular to a combination of cushion columns and screws. Background technique [0002] In the modules of electronic equipment, board-to-board connectors are often used to interconnect two or more printed boards to achieve electrical connection, and then the printed boards are fixed to the module housing by screws to realize the mechanical structure. Fasten the connection. In order to ensure the reliable connection of the board-to-board connector when the boards are interconnected, some pads are usually installed between the two printed boards, such as figure 1 shown. [0003] Before fixing the first printed board 1 , the spacers must be accurately placed in the corresponding mounting holes of the second printed board 2 . The central axis of the backing column is a light hole. If the backing post is not accurately prevented, the fixing screws can...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a combination of pads and screws to solve the problem that the pads and the mounting holes of the printed board cannot be accurately positioned when the module is assembled, often resulting in the need to repeatedly disassemble the fixing screws

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