Electrical connector having a metal housing

1. An electrical connector, comprising: a plastic base on which at least one connection space is formed; a plurality of terminals disposed in the plastic base, each of the terminals having a pin portion extending out of the plastic base; and a metal housing, which has a top surface, two side surfaces, a front surface and a rear surface and covers the plastic base, one of the top, side, front and rear surfaces being formed with an opening for exposing the at least one connection space of the plastic base to the outside, wherein; a locking device is formed on the rear surface and one of the side surfaces of the metal housing for engaging with corresponding surfaces of the plastic base; the locking device comprises a first engaging piece and a second engaging piece corresponding to the first engaging piece; and the first engaging piece is formed with a longitudinal slot through which the second engaging piece passes; each of said corresponding surfaces of the plastic base is formed with at least one engaging block; the first engaging piece is formed with a first engagement hole engaging with the engaging block on one of said corresponding surfaces of the plastic base; and the second engaging piece is formed with a second engagement hole engaging with the engaging block on the other of said corresponding surfaces of the plastic base.

2. The connector according to claim 1 , wherein the first engaging piece is bent and disposed on an edge of one of the side surfaces of the metal housing, and the second engaging piece is bent and disposed on an edge of the rear surface of the metal housing.

3. The connector according to claim 1 , wherein:

each of the rear surface of the plastic base and one of the side surfaces of the plastic base is formed with three engaging blocks;

the locking device comprises the first engaging piece and three second engaging pieces; and

the first engaging piece is formed with three first engagement holes and three longitudinal slots through which the three second engaging pieces pass.

4. The connector according to claim 1 , wherein the first engaging piece is disposed at a rear end of one of the side surfaces, and the second engaging piece is bent to pass through the longitudinal slot of the first engaging piece from one side of the rear surface.

5. The connector according to claim 1 , wherein the top surface comprises a first surface and a second surface, which are respectively connected to upper edges of the two side surfaces.

6. The connector according to claim 1 , wherein the top surface has a folded edge against which the rear surface rests, and the folded edge is pressed to form an elastic sheet for engaging with the plastic base.

7. The connector according to claim 1 , wherein the metal housing comprises:

a main body, which is fixed to the plastic base and has a front surface, two side surfaces and an upper edge formed with an upward fixing piece on which an elastic locking piece is disposed; and

an upper cover having downward connection flanges disposed at two sides of the upper cover, wherein an engaging slot is formed on an inner surface of the connection flange corresponding to the elastic locking piece of the upward fixing piece of the main body, the upper cover covers the upper edge of the main body, and the downward connection flange is connected to and disposed outside the upward fixing piece and engages with the elastic locking piece through the engaging slot.

8. The connector according to claim 7 , wherein the upward fixing piece of the main body of the metal housing slightly retracts inward to form a step with each of the surfaces of the main body, and the connection flange is flush with each of the surfaces of the main body when the upper cover covers the main body.

9. An electrical connector, comprising:

a plastic base on which at least one connection space is formed;

a plurality of terminals disposed in the plastic base, each of the terminals having a pin portion extending out of the plastic base; and

a metal housing, which has a top surface, two side surfaces, a front surface and a rear surface and covers the plastic base, one of the top, side, front and rear surfaces being formed with an opening for exposing the at least one connection space of the plastic base to the outside, wherein:

a locking device is formed on the rear surface and one of the side surfaces of the metal housing;

the locking device comprises a first engaging piece and a second engaging piece corresponding to the first engaging piece;

the first engaging piece is formed with a longitudinal slot through which the second engaging piece passes; and

the first engaging piece is depressed relative to one of the surfaces adjacent to the first engaging piece such that a depression is formed between the first engaging piece and the surface, the longitudinal slot is formed between the first engaging piece and the surface, and the second engaging piece is prodded to form an elastic engaging part, which bounces to rest against an inner edge of the first engaging piece.

10. The connector according to claim 9 , wherein the first engaging piece is disposed at a rear end of one of the side surfaces, and the second engaging piece is bent to pass through the longitudinal slot of the first engaging piece from one side of the rear surface.

11. The connector according to claim 9 , wherein the top surface comprises a first surface and a second surface, which are respectively connected to upper edges of the two side surfaces.

12. The connector according to claim 9 , wherein the top surface has a folded edge against which the rear surface rests, and the folded edge is pressed to form an elastic sheet for engaging with the plastic base.

13. The connector according to claim 9 , wherein the metal housing comprises:

a main body, which is fixed to the plastic base and has a front surface, two side surfaces and an upper edge formed with an upward fixing piece on which an elastic locking piece is disposed; and

an upper cover having downward connection flanges disposed at two sides of the upper cover, wherein an engaging slot is formed on an inner surface of the connection flange corresponding to the elastic locking piece of the upward fixing piece of the main body, the upper cover covers the upper edge of the main body, and the downward connection flange is connected to and disposed outside the upward fixing piece and engages with the elastic locking piece through the engaging slot.

14. The connector according to claim 13 , wherein the upward fixing piece of the main body of the metal housing slightly retracts inward to form a step with each of the surfaces of the main, body, and the connection flange is flush with each of the surfaces of the main body when the upper cover covers the main body.

15. An electrical connector, comprising:

a plastic base on which at least one connection space is formed;

a plurality of terminals disposed in the plastic base, each of the terminals having a pin portion extending out of the plastic base; and

a metal housing, which has a top surface, two side surfaces, a front surface and a rear surface and covers the plastic base, one of the top, side, front and rear surfaces being formed with an opening for exposing the at least one connection space of the plastic base to the outside, wherein:

a locking device is formed on the rear surface and one of the side surfaces of the metal housing;

the locking device comprises a first engaging piece and a second engaging piece corresponding to the first engaging piece;

the first engaging piece is formed with a longitudinal slot through which the second engaging piece passes;

the rear surface of the metal housing is divided into two half surfaces respectively connected to the two side surfaces;

the first engaging piece is disposed on an edge of one of the half surfaces;

the first engaging piece is further formed with an engaging hole communicating with the longitudinal slot;

the longitudinal slot is longer than the engaging hole such that a “T” shape is formed; and

the second engaging piece, which is disposed at an edge of the other of the half surfaces and has the “T” shape, passing through the longitudinal slot and then engaging with the engaging hole.

16. The connector according to claim 15 , wherein the first engaging piece is disposed at a rear end of one of the side surfaces, and the second engaging piece is bent to pass through the longitudinal slot of the first engaging piece from one side of the rear surface.

17. The connector according to claim 15 , wherein the top surface comprises a first surface and a second surface, which are respectively connected to upper edges of the two side surfaces.

18. The connector according to claim 15 , wherein the top surface has a folded edge against which the rear surface rests, and the folded edge is pressed to form an elastic sheet for engaging with the plastic base.

19. The connector according to claim 15 , wherein the metal housing comprises:

a main body, which is fixed to the plastic base and has a front surface, two side surfaces and an upper edge formed with an upward fixing piece on which an elastic locking piece is disposed; and

an upper cover having downward connection flanges disposed at two sides of the upper cover, wherein an engaging slot is formed on an inner surface of the connection flange corresponding to the elastic locking piece of the upward fixing piece of the main body, the upper cover covers the upper edge of the main body, and the downward connection flange is connected to and disposed outside the upward fixing piece and engages with the elastic locking piece through the engaging slot.

20. The connector according to claim 19 , wherein the upward fixing piece of the main body of the metal housing slightly retracts inward to form a step with each of the surfaces of the main body, and the connection flange is flush with each of the surfaces of the main body when the upper cover covers the main body.