a computer enclosure includes a chassis a cover detachably mounted to the chassis and a rotary member pivotably attached to the cover the chassis includes at least one assembly slot defined therein a sliding member is slidably installed in the cover at least one hook is formed on the sliding member and engaged in the assembly slot of the chassis the rotary member is capable of being rotated to drive the sliding member to slide in the cover thereby disengaging the hook from the assembly slot application_number US 48528809 A description referring to fig1 fig2 and fig6 an embodiment of a computer enclosure includes a chassis 10 and a cover 40 detachably mounted thereon the chassis 10 includes side panels 11 12 13 14 a first flange 112 extends from a top edge of the side panel 11 and a second flange 122 is extends from a top edge of the side panel 12 a plurality of assembly slots 114 is defined in the first flange 112 the cover 40 includes a receiving portion 42 with two fixing holes 422 an opening 424 is defined in the receiving portion 42 and a locating hole 425 is defined in the receiving portion 42 adjacent to the opening 424 a through opening 426 is defined in one edge of the receiving portion 42 a locating piece 4242 protrudes from one edge of the opening 424 an elongate sliding channel 44 is defined on one edge of the cover 40 adjacent to the receiving portion 42 and a bent piece 49 is formed in another edge of the cover 40 corresponding to the second flange 122 of the chassis 10 referring to fig4 a first retaining portion 444 is disposed on one side of the.