Locking mechanism

1. A locking mechanism, for fixing and positioning a workpiece, comprising:

a base for supporting the workpiece, the base defining a through mounting hole;

at least one locking member comprising a main body, a blocking portion and a latching portion, the blocking portion and the latching portion respectively formed on opposite ends of the main body;

at least one first retaining plate mounted on the base by the at least one locking member, the at least one first retaining plate defining a through first opening corresponding to the mounting hole; and

an elastic member, wherein the main body passes through the mounting hole and the first opening, the elastic member resists against the base and the blocking portion, the latching portion is engaged with and latched with the at least one first retaining plate by an elastic force of the elastic member.

2. The locking mechanism of claim 1 , further comprising a limiting member, wherein the limiting member is mounted on the base, the at least one first retaining plate further defines a first limiting hole corresponding to the limiting member, and one end of the limiting member is received in the first limiting hole, for positioning the at least one first retaining plates along a direction perpendicularly to the axial direction of the first limiting hole.

3. The locking mechanism of claim 2 , wherein the base further defines a fixing hole, and the limiting member is securely mounted in the fixing hole.

4. The locking mechanism of claim 1 , wherein the base comprises a support portion and a positioning portion protruding from the support portion, the mounting hole is defined in the positioning portion through the support portion, and the at least one first retaining plate is mounted on the positioning portion.

5. The locking mechanism of claim 4 , wherein the mounting hole is stepped and having a stepped surface, the mounting hole comprises a first receiving hole and a second receiving hole communicating to the first receiving hole, the main body is received in the first receiving hole and the second receiving hole, the blocking portion is received in the first receiving hole, the elastic member is received in the first receiving hole, and the opposite ends of the elastic member respectively resist against the stepped surface and the blocking portion.

6. The locking mechanism of claim 4 , wherein at least one accommodation portion is formed on a top of the positioning portion by depression, the at least one first retaining plate is mounted in the accommodation portion, and partly protrude out from the positioning portion.

7. The locking mechanism of claim 6 , wherein the support portion comprises a support surface adjacent to the positioning portion, the positioning portion comprises a resisting surface substantially perpendicularly to the support surface, the support surface, the resisting surface and the two retaining plates cooperatively form a fixing groove, for positioning the workpiece.

8. The locking mechanism of claim 1 , wherein the first opening is stepped, and communicates to an inner side surface of the at least one first retaining plate.

9. The locking mechanism of claim 8 , wherein the first opening comprises a first retaining hole and a first passing-through hole with a smaller diameter than the first retaining hole, and the latching portion of the at least one locking member is latched with the first retaining hole.

10. The locking mechanism of claim 1 , further comprising at least one second retaining plate mounted on the base by the at least one locking member, the at least one second retaining plate defining a through second opening corresponding to the mounting hole, wherein the at least one second retaining plate is positioned adjacent to the at least one first retaining plate.

11. A locking mechanism, for fixing and positioning a workpiece, comprising:

a base for supporting the workpiece, the base defining a through mounting hole;

at least one locking member comprising a main body, a blocking portion and a latching portion, the blocking portion and the latching portion respectively formed on opposite ends of the main body;

at least one first retaining plate mounted on the base by the at least one locking member, the at least one first retaining plate defining a through first opening corresponding to the mounting hole, and the first opening communicating to an inner side surface of the at least one first retaining plate; and

an elastic member received in the mounting hole, wherein the main body passes through the mounting hole and the first opening, the elastic member resists against the base and the blocking portion, the latching portion is engaged with and latched with the at least one first retaining plate by an elastic force of the elastic member.

12. The locking mechanism of claim 11 , further comprising a limiting member, wherein the limiting member is mounted on the base, the at least one first retaining plate further defines a first limiting hole corresponding to the limiting member, and one end of the limiting member is received in the first limiting hole, for positioning the at least one first retaining plates along a direction perpendicularly to the axial direction of the first limiting hole.

13. The locking mechanism of claim 12 , wherein the base further defines a fixing hole, and the limiting member is securely mounted in the fixing hole.

14. The locking mechanism of claim 11 , wherein the base comprises a support portion and a positioning portion protruding from the support portion, the mounting hole is defined in the positioning portion through the support portion, and the at least one first retaining plate is mounted on the positioning portion.

15. The locking mechanism of claim 14 , wherein the mounting hole is stepped and having a stepped surface, the mounting hole comprises a first receiving hole and a second receiving hole communicating to the first receiving hole, the main body is received in the first receiving hole and the second receiving hole, the blocking portion is received in the first receiving hole, the elastic member is received in the first receiving hole, and the opposite ends of the elastic member respectively resist against the stepped surface and the blocking portion.

16. The locking mechanism of claim 14 , wherein at least one accommodation portion is formed on a top of the positioning portion by depression, the at least one first retaining plate is mounted in the accommodation portion, and partly protrude out from the positioning portion.

17. The locking mechanism of claim 16 , wherein the support portion comprises a support surface adjacent to the positioning portion, the positioning portion comprises a resisting surface substantially perpendicularly to the support surface, the support surface, the resisting surface and the two retaining plates cooperatively form a fixing groove, for positioning the workpiece.

18. The locking mechanism of claim 11 , wherein the first opening is stepped.

19. The locking mechanism of claim 18 , wherein the first opening comprises a first retaining hole and a first passing-through hole with a smaller diameter than the first retaining hole, and the latching portion of the at least one locking member is latched with the first retaining hole.

20. The locking mechanism of claim 11 , further comprising at least one second retaining plate mounted on the base by the at least one locking member, the at least one second retaining plate defining a through second opening corresponding to the mounting hole, wherein the at least one second retaining plate is positioned adjacent to the at least one first retaining plate.