Fixing device with long displacement stroke

A fixing device with long displacement stroke, comprising:

• an inner sleeve comprising an inner sleeve body, a passage and a stop groove formed inside said inner sleeve body, an annular convex portion formed on a top side of said inner sleeve body and expanding outward, and a positioning structure formed on an opposing bottom side of said inner sleeve body;
• a fixing member comprising a head portion, a guide slope extending obliquely downward from an edge of said head portion, and a coupling portion downwardly extending from a bottom side of said head portion and inserted into said passage of said inner sleeve;
• and
• an outer sleeve comprising an outer sleeve body, a receiving space formed inside said outer sleeve body, a top surface formed on a top side of said outer sleeve body, a bevel groove formed on said top surface and extending obliquely inward corresponding to an opening of said receiving space, and a limiting ring portion formed on an opposing bottom side of said outer sleeve body and bent inward to cover said annular convex portion of said inner sleeve;
• wherein when said fixing member is unlocked and moved upward, an interference positioning between said guide slope and said bevel groove is formed, and said outer sleeve is moved upward on said inner sleeve;
• when said fixing member is moved downward and locked, the bottom side of said head portion is abutted and positioned at said stop groove of said inner sleeve, and said outer sleeve forms a downward displacement on said inner sleeve, and said top surface of said outer sleeve has a bottom side thereof abutted against said annular convex portion of said inner sleeve.