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A fixing device for an extension card having a bracket with a bent portion has a casing and a metal pressing member. The casing has a support portion. The metal pressing member has a longitudinal bottom plate, a pivotal structure, and a resilient latching structure. The pivotal structure is pivotall

A fixing device for an extension card having a bracket with a bent portion has a casing and a metal pressing member. The casing has a support portion. The metal pressing member has a longitudinal bottom plate, a pivotal structure, and a resilient latching structure. The pivotal structure is pivotally connected to the casing. The bent portion of the bracket of the extension card is placed on the support portion of the casing. The longitudinal bottom plate of the metal pressing member presses on the bent portion. The resilient latching structure of the metal pressing member detachably latches onto the casing. As a result, the extension card is capable of being retained in or dismounted from the casing easily and quickly.

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What is claimed is: 1. A fixing device for an extension card having a bracket with a bent portion and a body portion, the fixing device comprising: a metal pressing member having first and second opposing ends, comprising a pivotal structure on the first end of the metal pressing member, and a resi

What is claimed is: 1. A fixing device for an extension card having a bracket with a bent portion and a body portion, the fixing device comprising: a metal pressing member having first and second opposing ends, comprising a pivotal structure on the first end of the metal pressing member, and a resilient latching structure on the second end of the metal pressing member, the resilient latching structure having a latching portion, and a casing having a support portion, the support portion having a hook tab and at least one protruding shaft respectively corresponding to the resilient latching structure and the pivotal structure, so that the resilient latching structure of the metal pressing member detachably latches onto the casing, and the pivotal structure is pivotally connected to the casing. 2. The fixing device as claimed in claim 1, wherein the support portion of the casing has a screw hole, the metal pressing member having a bottom plate that has an aperture, the bent portion of the bracket of the extension card has a notch, a screw is penetrated through the aperture, a head of the screw presses on the bracket, and a thread portion of the screw is penetrated through the notch and fastened in the screw hole. 3. The fixing device as claimed in claim 1, wherein the metal pressing member has a bottom plate that has a resilient tab, and the resilient tab contacts the bent portion of the bracket of the extension card. 4. The fixing device as claimed in claim 1, wherein the support portion of the casing has a positioning hole, the metal pressing member has a bottom plate that has a positioning tab, and the positioning tab is inserted into the positioning hole. 5. The fixing device as claimed in claim 1, wherein the metal pressing member has a hanging tab, the hanging tab is perpendicular to a bottom plate of the metal pressing member and extends downward, the body of the extension card being perpendicular to the bent portion of the extension card, and the hanging tab hooks onto the body portion. 6. The fixing device as claimed in claim 1, wherein the metal pressing member has an upper-bent plate disposed on an upper edge thereof. 7. The fixing device as claimed in claim 1, wherein the at least one protruding shaft of the casing comprises two protruding shafts, the pivotal structure of the metal pressing member has two lateral ear portions, each of the lateral ear portions has a pivotal hole, and the pivotal holes are pivotally connected to the protruding shafts, respectively. 8. The fixing device as claimed in claim 1, wherein the resilient latching structure further has a resilient arm having a bottom end integrally connected with a bottom plate of the metal pressing member, the resilient arm has a top end slanting outward along a longitudinal direction of the bottom plate, the latching portion is integrally connected with the top end of the resilient arm, and the latching portion latches onto the hook tab. 9. The fixing device as claimed in claim 8, wherein the resilient arm has a pull portion. 10. The fixing device as claimed in claim 8, wherein the latching portion has an inner-bent portion and an upper-bent portion, the inner-bent portion extends from the top end of the resilient arm toward the pivotal structure, and the upper-bent portion extends upward from the inner-bent portion. 11. The fixing device as claimed in claim 10, wherein the side plate has a stop portion, and the stop portion is disposed inside the upper-bent portion of the latching portion. 12. The fixing device as claimed in claim 1, wherein the casing has a latching hole, the resilient latching structure has a resilient arm, the resilient arm has a projection, and the projection latches in the latching hole. 13. The fixing device as claimed in claim 12, wherein the resilient arm has a pull portion. 14. A fixing device for an extension card having a bracket with a bent portion and a body portion, the fixing device comprising: a casing having a support portion; and a metal pressing member having a longitudinal bottom plate, a longitudinal side plate, a pivotal structure, a hanging tab that hooks onto the body portion of the extension card, and a resilient latching structure, the side plate being integrally connected with a longitudinal side edge of the bottom plate, the pivotal structure, the hanging tab, and the resilient latching structure being integrally connected with two ends of the bottom plate, respectively, and the pivotal structure being pivotally connected to the casing; wherein the bent portion of the bracket of the extension card is placed on the support portion of the casing, the bottom plate of the metal pressing member presses on the bent portion, and the resilient latching structure of the metal pressing member detachably latches onto the casing. 15. The fixing device as claimed in claim 14, wherein the hanging tab is perpendicular to the bottom plate of the metal pressing member and extends downward. 16. The fixing device as claimed in claim 14, wherein the resilient latching structure has a resilient arm that has a bottom end integrally connected with the bottom plate of the metal pressing member, the resilient arm has a top end slanting outward along a longitudinal direction of the bottom plate, and a latching portion is integrally connected with the top end of the resilient arm to latch onto the hook tab. 17. The fixing device as claimed in claim 16, wherein the side plate has a stop portion, and the stop portion is disposed inside an upper-bent portion of the latching portion. 18. The fixing device as claimed in claim 16, wherein the latching portion has an inner-bent portion and an upper-bent portion, the inner-bent portion extends from the top end of the resilient arm toward the pivotal structure, and the upper-bent portion extends upward from the inner-bent portion. 19. The fixing device as claimed in claim 16, wherein the casing has a latching hole, the resilient arm has a projection, and the projection latches in the latching hole.