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A server rack assembly includes a rack, a chassis, and a locking device. The rack has two side plates each defining a receiving slot. The chassis receives an electronic component, and is received between the side walls. The locking device includes a bracket, a locker, and two elastic members. The br

A server rack assembly includes a rack, a chassis, and a locking device. The rack has two side plates each defining a receiving slot. The chassis receives an electronic component, and is received between the side walls. The locking device includes a bracket, a locker, and two elastic members. The bracket is positioned at an end of the chassis and adjacent to the receiving slot. The locker is fixed to the center of the bracket. The two elastic members are fixed to two opposite ends of the bracket. Each elastic member includes a protrusion and a locking piece at two opposite ends thereof. The elastic member is capable of rotating between a first position where the locker locks the locking piece and the protrusion is received in the receiving slot, and a second position where the locker unlocks the locking piece and the protrusion is released from the receiving slot.

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1. A server rack assembly, comprising: a rack having two side plates, each side plate defining a receiving slot at one end thereof;a chassis received in the rack and defining a first cavity for receiving an electronic component; anda locking device positioned on an end of the chassis and adjacent to

1. A server rack assembly, comprising: a rack having two side plates, each side plate defining a receiving slot at one end thereof;a chassis received in the rack and defining a first cavity for receiving an electronic component; anda locking device positioned on an end of the chassis and adjacent to the receiving slot, the locking device comprising: a bracket having a first plate sealing the cavity and a second plate extending from an edge of the first plate, wherein the first plate defines two first slots at an edge of the first plate, the two first slots are adjacent to the second plate, the second plate defines two strip slots whose lengthwise directions are substantially perpendicular to the first plate, the two strip slots positioned at two opposite ends of the second plate;a locker positioned on the center of the first plate; andtwo elastic members positioned on two opposite ends of the second plate, each elastic member comprising: a hook having a locking piece configured to engage with the locker, a protrusion corresponding to the receiving slot of the rack, and a resisting portion extending from an edge thereof, the locking piece and the protrusion positioned at two opposite ends of the hook, the resisting portion configured to cover the first slot of the first plate, the hook defining a fixing hole between the protrusion and the resisting portion,an elastic piece positioned on an end of the second plate, and comprising an elastic portion protruding out of the first slot of the first plate and configured to resist against the resisting portion, anda first rivet passing through the strip slot and fixed to the fixing hole through to secure the hook to the second plate, wherein the elastic piece comprises a fixing portion and the elastic portion, the fixing portion is substantially “8” shaped, the elastic portion is “L” shaped and slants outwardly from the middle of the fixing portion; a second rivet is mounted on the second plate near the strip slot, the fixing portion of the elastic piece is intervened between the first and second rivets. 2. The server rack assembly of claim 1, wherein the rack further comprises a bottom plate and a top plate, the bottom plate and the top plate are connected with the two side plates and opposite to each other, opposing each other, the rack defines a second cavity between the bottom plate, the top plate and the two side plates, the second cavity receives the chassis. 3. The server rack assembly of claim 1, wherein the rack further comprises a back plate connected an end of each side plate, the back plate forms a plurality of first connection ports, the connection ports are located between the two side plates and configured to connect the electronic component. 4. The server rack assembly of claim 3, wherein the chassis comprises a bottom wall, two side walls extending upwards from two opposite sides of the bottom wall, a top wall connected to the two side walls and opposing the bottom wall, and a back wall extending downwards from an end of the top wall, the back wall defines a number of connection slots corresponding to the first connection parts of the rack, the first cavity is defined between the bottom wall, the two side walls, the top wall, and the back wall. 5. The server rack assembly of claim 1, wherein the first plate defines two second slots and two third slots, the third slots are positioned between the two second slots, the two second slots are positioned between the two first slots. 6. The server rack assembly of claim 5, wherein the locker comprises two shafts configured for locking the locking piece of the hook, a helical spring connecting to the two shafts, and a shell receiving the shafts and the helical spring, the shell is fixed to the first plate. 7. The server rack assembly of claim 6, wherein each of the two shafts comprises a main body, a positioning portion, an operating portion, a locking portion, and a connecting portion; the positioning portion and the operating portion extend from two opposite sides of the main body, the locking portion and the connecting portion extend from two another opposite ends of the main body; the shell comprises a bottom plate and four side plates surrounding the bottom plate, the bottom plate defines two positioning slots; the helical spring engages with the connecting portions of the two shafts, the operating portion of each shaft protrudes out of a corresponding third slot of the first plate and is capable of moving in the corresponding third slot, the positioning portion of each shaft is received in a corresponding positioning slot and capable of moving in the corresponding positioning slot, the locking piece is configured to pass through a corresponding second slot and be locked by a corresponding locking portion. 8. The server rack assembly of claim 1, wherein the hook further comprises a substantially rectangular rotating board, the locking piece comprises an operating plate extending from one end of the rotating board, and a locking plate extending from the edge of the operating plate that is away from the protrusion, the locking plate defines a locking slot therethrough for being locked by the locker, the protrusion extends from the other end of the rotating board, the resisting portion extends upwards from an edge of the rotating board, the fixing hole is defined in the rotating board. 9. The server rack assembly of claim 8, wherein the hook further comprises a block protruding from the rotating board, the block is adjacent to the protrusion. 10. The server rack assembly of claim 1, wherein the first rivet is capable of moving in the strip slot. 11. A server rack assembly, comprising: a rack having two side plates, each side plate defining a receiving slot at one end thereof;a chassis received in the rack and defining a first cavity for receiving an electronic component; anda locking device positioned on an end of the chassis and adjacent to the receiving slot, the locking device comprising: a bracket having a first plate sealing the cavity and a second plate extending from an edge of the first plate, wherein the first plate defines two first slots at an edge of the first plate, the two first slots are adjacent to the second plate, the second plate defines two strip slots whose lengthwise directions are substantially perpendicular to the first plate, the two strip slots positioned at two opposite ends of the second plate;a locker positioned on the center of the first plate; andtwo elastic members positioned on two opposite ends of the second plate, each elastic member comprising: a hook having a locking piece configured to engage with the locker, a protrusion corresponding to the receiving slot of the rack, and a resisting portion extending from an edge thereof, the locking piece and the protrusion positioned at two opposite ends of the hook, the resisting portion configured to cover the first slot of the first plate, the hook defining a fixing hole between the protrusion and the resisting portion,an elastic piece positioned on an end of the second plate, and comprising an elastic portion protruding out of the first slot of the first plate and configured to resist against the resisting portion, anda first rivet passing through the strip slot and fixed to the fixing hole through to secure the hook to the second plate, wherein the locker comprises two shafts configured for locking the locking piece of the hook, a helical spring connecting to the two shafts, and a shell receiving the shafts and the helical spring, the shell is fixed to the first plate. 12. The server rack assembly of claim 11, wherein the rack further comprises a bottom plate and a top plate, the bottom plate and the top plate are connected with the two side plates and opposite to each other, opposing each other, the rack defines a second cavity between the bottom plate, the top plate and the two side plates, the second cavity receives the chassis. 13. The server rack assembly of claim 11, wherein the rack further comprises a back plate connected an end of each side plate, the back plate forms a plurality of first connection ports, the connection ports are located between the two side plates and configured to connect the electronic component. 14. The server rack assembly of claim 13, wherein the chassis comprises a bottom wall, two side walls extending upwards from two opposite sides of the bottom wall, a top wall connected to the two side walls and opposing the bottom wall, and a back wall extending downwards from an end of the top wall, the back wall defines a number of connection slots corresponding to the first connection parts of the rack, the first cavity is defined between the bottom wall, the two side walls, the top wall, and the back wall. 15. The server rack assembly of claim 11, wherein the first plate defines two second slots and two third slots, the third slots are positioned between the two second slots, the two second slots are positioned between the two first slots. 16. The server rack assembly of claim 15, wherein each of the two shafts comprises a main body, a positioning portion, an operating portion, a locking portion, and a connecting portion; the positioning portion and the operating portion extend from two opposite sides of the main body, the locking portion and the connecting portion extend from two another opposite ends of the main body; the shell comprises a bottom plate and four side plates surrounding the bottom plate, the bottom plate defines two positioning slots; the helical spring engages with the connecting portions of the two shafts, the operating portion of each shaft protrudes out of a corresponding third slot of the first plate and is capable of moving in the corresponding third slot, the positioning portion of each shaft is received in a corresponding positioning slot and capable of moving in the corresponding positioning slot, the locking piece is configured to pass through a corresponding second slot and be locked by a corresponding locking portion. 17. The server rack assembly of claim 11, wherein the hook further comprises a substantially rectangular rotating board, the locking piece comprises an operating plate extending from one end of the rotating board, and a locking plate extending from the edge of the operating plate that is away from the protrusion, the locking plate defines a locking slot therethrough for being locked by the locker, the protrusion extends from the other end of the rotating board, the resisting portion extends upwards from an edge of the rotating board, the fixing hole is defined in the rotating board. 18. The server rack assembly of claim 17, wherein the hook further comprises a block protruding from the rotating board, the block is adjacent to the protrusion. 19. The server rack assembly of claim 11, wherein the first rivet is capable of moving in the strip slot.