Fixing device for fixing an expansion card in an electronic device

1. A fixing device for fixing an expansion card in an electronic device, the electronic device comprising an expansion port, the fixing device comprising:

a supporting base that supports the expansion card and comprises a sliding rail, wherein the sliding rail is located under the expansion card, and the sliding rail comprises plural first positioning structures;

a fastening element comprising a sliding part and a locking part, wherein the sliding part is movably installed on the sliding rail, and the sliding part has a first side and a second side opposite to the first side, wherein the locking part is protruded from the first side of the sliding part, and the expansion card is arranged between the locking part and the expansion port, wherein the fastening element further comprises a first guiding recess and a second guiding recess, and the sliding part further has a third side and a fourth side, wherein the third side and the fourth side are opposed to each other, and the third side and the fourth side are arranged between the first side and the second side, wherein the first guiding recess is formed in the third side of the sliding part, a first lateral of the sliding rail is accommodated within the first guiding recess, the second guiding recess is formed in the fourth side of the sliding part, and a second lateral structure of the sliding rail is accommodated within the second guiding recess, wherein the sliding part is movable along the sliding rail and relative to the supporting base in the direction toward or away from the expansion port through guidance of the first guiding recess and the second guiding recess; and

an actuating element comprising a pressing part and an elastic part, wherein the pressing part is connected with the sliding part through the elastic part, the pressing part is aligned with the second side of the sliding part, and the pressing part comprises at least one second positioning structure,

wherein as the pressing part is moved, the sliding part is correspondingly slid along the sliding rail and relative to the supporting base in a direction toward or away from the expansion port, wherein as the sliding part is slid, the locking part is correspondingly slid between plural positions, wherein the pressing part is permitted to be swung relative to the sliding part through the elastic part, and the at least one second positioning structure is detachably engaged with one of the plural first positioning structures, so that the locking part is positioned at one of the plural positions,

wherein the fastening element further comprises a first engaging recess and a second engaging recess, and the elastic part of the actuating element comprises a first resilient arm and a second resilience arm, wherein the first engaging recess is concavely formed in the third side of the sliding part, and the second engaging recess is concavely formed in the fourth side of the sliding part, wherein the first resilient arm is protruded from a first end of the pressing part and extended in a direction toward the sliding part, and a first tenon of the first resilient arm is engaged with the first engaging recess wherein the second resilience arm is protruded from a second end of the pressing part and extended in the direction toward the sliding part and a second tenon of the second resilience arm is engaged with the second engaging recess.

2. The fixing device according to claim 1 , wherein the supporting base further comprises a supporting surface, wherein the expansion card is supported on the supporting surface, and the sliding rail and the supporting surface are located beside each other.

3. The fixing device according to claim 1 , wherein the fastening element further comprises a first position-limiting structure and a second position-limiting structure, wherein the first position-limiting structure is protruded from a first end of the second side of the sliding part and extended in a direction toward the pressing part, and the first position-limiting structure is located under the first resilient arm, wherein the second position-limiting structure is protruded from a second end of the second side of the sliding part and extended in the direction toward the pressing part, and the second position-limiting structure is located under the second resilience arm.

4. The fixing device according to claim 3 , wherein there is a gap between the first position-limiting structure and the first resilient arm, and there is another gap between the second position-limiting structure and the second resilience arm.

5. The fixing device according to claim 1 , wherein the first positioning structures of the sliding rail are concave structures, and the second positioning structure of the pressing part is a convex structure, wherein a shape of each of the plural concave structures and a shape of the convex structure match each other.

6. The fixing device according to claim 1 , wherein when the locking part is positioned at one of the plural positions, the locking part is locked on the expansion card, so that the expansion card is fixed between the expansion port and the locking part.

7. The fixing device according to claim 1 , wherein the electronic device is a multifunction docking station, and the expansion card is a solid state drive module.