Patent ID: 6674638
Filing Date: 2004-01-06
Classification: G06F,Y10T

Abstract:
A fastening device for assembling a first unit and a second unit wherein said first unit has a first cover and said second unit has a second cover, said fastening device comprising:a positioning post having a post body and a round top, one end of said post body being mounted on the first cover, and the diameter of said round top being larger than that of said post body; a positioning aperture being positioned on said second cover and having a round hole and an elongate extension hole, said round hole permitting said round top to pass therethrough, and the width of said elongate extension hole being smaller than the diameter of said round top and said elongate extension hole permitting said post body to move therein; a sliding piece being mounted on said second cover and having at least one arm of which a slant edge slants upward along a first direction; a resilient element of which one end is fixed on said sliding piece and the other end is fixed on said second cover for connecting said sliding piece with said second cover and allowing said sliding piece to move with said resilient element on said second cover; and an operating key being mounted on the upper end of said sliding piece such that a user can pushes said sliding piece along the first direction by means of the operating key; whereby before said positioning post is inserted into said positioning aperture, said arm of said sliding piece is just above said elongate extension hole; when said positioning post is inserted into said positioning aperture, said positioning post will slide downward along said slant edge of said arm due to the gravity of said first unit such that said positioning post pushes said sliding piece along the first direction and thus said spring is stretched; when said positioning post continues to slide downward to the bottom of said elongate extension hole, said sliding piece will be pulled back due to the resilient force of said resilient element such that said arm returns to the position above said elongate extension hole to fix said positioning post.