Portable computer having pivotable detachable cover with display

Claim 1

A portable computer comprising a mainframe and an upper cover, said mainframe having a disk holder for alternatively holding a floppy disk drive or a hard disk drive, a hard disk drive and a keyboard, said upper cover being detachably pivotably fastened in an upper cover mounting seat on said mainframe by an elongated hook plate, said upper cover mounting seat comprising a movable plate, an elongated rod attached to said movable plate at the middle, two retainer blocks on said movable plate at two opposite locations, a stub rod fastened within said upper cover mounting seat, and a spring having one end fastened in a hole in said elongated rod and an opposite end secured to said stub rod, said elongated hook plate having two hooked portions extending from the bottom edge thereof at two opposite locations, wherein inserting said elongated hook plate into said upper cover mounting seat causes said two hooked portions to be engaged with said two retainer blocks; and moving said movable plate sidewards causes said two hooked portions to disconnect from said two retainer blocks.