# Patent

## Title
Electrical connector having a metal housing

## Abstract

An electrical connector includes a plastic base, a plurality of terminals and a metal housing. One connection space is formed on the plastic base. The terminals each having a pin portion extending out of the plastic base are disposed in the plastic base. The metal housing 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 is formed with an opening for exposing the connection space of the plastic base to the outside. A locking device is formed on the rear surface and one of the side surfaces of the metal housing. The locking device includes 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.

## Background
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an electrical connector, and more particularly to an electrical connector with a metal housing.
2. Description of the Related Art
Referring to FIG. 1, a first conventional multi-jack electrical connector includes a plastic base 10 and a metal housing 20. A plurality of terminals is disposed in the plastic base 10. A front end of the plastic base 10 is formed with three connection holes 11. The metal housing 20 covers the plastic base 10 and is integrally formed with a top surface 21, a front surface 22, a rear surface 23 and two side surfaces 24. Two sides of each of the top surface 21 and the rear surface 23 are formed with folded edges 25 and 26. The front surface 22 is formed with three openings 27 for exposing the connection holes 11 of the plastic base 10. The metal housing 20 is made by cropping a metal plate into a corresponding shape and then folding the metal plate into the metal housing with an open end.
The first prior art connector has the following drawbacks.
1. The metal housing 20 is formed by folding a plate to form a chamber, as shown in FIG. 2, so the developed shape has to be cut with a lot of wasted material.
2. The metal housing 20 is formed by folding a plate and the top surface 21 only rests against but is not integrally connected to the two side surfaces 24, so seams still exist. In order to enhance the sealing effect, the folded edges 25 are formed to cover the seams. Similarly, the seams are also formed between the rear surface 23 and the two side surfaces 24, and the folded edges 26 are also formed to cover the seams. The overlapped portions on the housing deteriorate the overall glorification.
As shown in FIGS. 3 and 4, a second conventional multi-jack electrical connector includes a plastic base 30 and a metal housing 40 and is almost the same as the first conventional connector. In order to reduce the waste of the material, the metal housing 40 is composed of a front housing 41 and a rear housing 47. The front housing 41 has a U-shape and includes a front surface 42 and two side surfaces 43. An upper portion of the front surface 42 is formed with a folded edge 44. A rear portion of each side surface 43 is formed with projecting engaging blocks 45. The rear housing 47 having an L-shape includes a top surface 48 and a rear surface 49. Two sides of the top surface 48 and the rear surface 49 are respectively formed with folded edges 410 and 411. The folded edge 411 is formed with engagement holes 412. When the front housing 41 and the rear housing 47 are assembled together, the engaging blocks 45 engage with the engagement holes 412, the folded edge 44 engages with the top surface 48 of the rear housing 47, and the folded edges 410 and 411 engage with the two side surfaces 43 of the front housing 41 and are located outside the two side surfaces 43.
Although the second conventional connector can reduce the waste of the material, it still has the drawback because the overlapped portions between the folded edges 44, 410 and 411 and the plate and the two rows of engagement holes 412 still exist on the exterior, and the glorification of the exterior is thus deteriorated.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide an electrical connector with a metal housing, which has a second engaging piece passing through a longitudinal slot of a first engaging piece of the metal housing. Thus, the first and second engaging pieces may be shielded and hidden by the rear and side surfaces of the main body.
Another object of the invention is to provide an electrical connector with a metal housing, wherein an upper cover is positioned on an upper edge of the main body having several circumferential surfaces, such that the number of overlapped folded edges and engagement holes can be reduced and the overall exterior may be glorified.
Still another object of the invention is to provide an electrical connector with a metal housing for saving the material.
To achieve the above-identified objects, the invention provides an electrical connector including a plastic base, a plurality of terminals and a metal housing. At least one connection space is formed on the plastic base. The terminals each having a pin portion extending out of the plastic base are disposed in the plastic base. The metal housing 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 is formed with an opening for exposing the at least one connection space of the plastic base to the outside. The locking device is formed on the rear surface and one of the side surfaces of the metal housing. The locking device includes 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.
According to the above-mentioned structure, the locking portions can be hidden, and the overall exterior can be glorified.
Other objects, features, and advantages of the invention will become apparent from the following detailed description of the preferred but non-limiting embodiments. The following description is made with reference to the accompanying drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a pictorial view showing a conventional multi-jack electrical connector.
FIG. 2 is a developed plane view showing a metal housing of the conventional multi-jack electrical connector.
FIG. 3 is a pictorially exploded view showing the conventional multi-jack electrical connector.
FIG. 4 is a pictorially assembled view showing the conventional multi-jack electrical connector.
FIG. 5 is a pictorially exploded view showing an electrical connector according to a first embodiment of the invention.
FIG. 6 is a pictorially assembled view showing the electrical connector according to the first embodiment of the invention.
FIG. 7 is a pictorial front view showing a plastic base according to the first embodiment of the invention.
FIG. 8 is a cross-sectional assembled view showing a metal housing according to the first embodiment of the invention.
FIG. 9 is a schematic assembled illustration showing the electrical connector according to the first embodiment of the invention.
FIG. 10 is a pictorially assembled view showing a first engaging piece engaging with the plastic base according to the first embodiment of the invention.
FIG. 11 is a schematic assembled illustration showing an electrical connector according to the first embodiment of the invention.
FIG. 12 is a pictorially exploded view showing an electrical connector according to a second embodiment of the invention.
FIG. 13 is a pictorially exploded view showing an electrical connector according to a third embodiment of the invention.
FIG. 14 is a pictorially assembled view showing the electrical connector according to the third embodiment of the invention.
FIG. 15 is a pictorially exploded view showing an electrical connector according to a fourth embodiment of the invention.
FIG. 16 is a pictorial view showing the electrical connector according to the fourth embodiment of the invention.
FIG. 17 is a pictorially exploded view showing an electrical connector according to a fifth embodiment of the invention.
FIG. 18 is a pictorially assembled view showing the electrical connector according to the fifth embodiment of the invention.
FIG. 19 is a cross-sectional assembled view showing an electrical connector according to a sixth embodiment of the invention.
FIG. 20 is a pictorially assembled view showing the electrical connector according to the sixth embodiment of the invention.
FIG. 21 is a pictorial view showing a metal housing, which is not locked, according to a seventh embodiment of the invention.
FIG. 22 is a pictorial view showing the metal housing, which is locked, according to the seventh embodiment of the invention.
FIG. 23 is a partially enlarged pictorial view showing the metal housing, which is locked, according to the seventh embodiment of the invention.



DETAILED DESCRIPTION OF THE INVENTION
Referring to FIGS. 5 and 6, an electrical connector of this embodiment is a dual-layer USB socket and includes a plastic base 50, terminals 60 and a metal housing 70.
Referring to FIGS. 5 to 7, a front end of the plastic base 50 is formed with two connection slots 51 to be connected to USB plugs, and at least three engaging blocks 52 are formed on each of a rear surface and a side surface of the plastic base 50.
The terminals 60 are disposed in the plastic base 50. Each terminal 60 has a contact located in the connection slot 51 of the plastic base 50 and a pin 61 extending out of the plastic base 50.
Referring to FIG 8, the metal housing 70 made of stainless steel plate includes a main body 71 and an upper cover (or a top surface) 713. The main body 71 includes a front surface 72, two side surfaces 73 and a rear surface 74 and is formed with a locking device. The side surfaces 73 are respectively combined with each of the front and rear surfaces 72 and 74, the top surface 713 is combined with each of the side surfaces 73, the front surface 72 and the rear surface 74, and the front surface 72 is integrally combined with each of the side surfaces 73. The locking device has a first engaging piece 75 and three second engaging pieces 76. The first engaging piece 75 is bent and located on an edge of the side surface 73. The second engaging piece 76 is bent and formed at the edge of the rear surface. The first engaging piece has three first engagement holes 77 and three longitudinal slots 78. The second engaging piece 76 is formed with a second engagement hole 79. In addition, the upper edge of each surface is formed with an upward fixing piece 710, which is formed with elastic locking pieces 711 that protrude upward and retract inward to form a step with each surface of the main body 71. The front surface 72 has two openings 712. When the metal housing 70 covers the plastic base 50, the plastic base 50 communicates with the outside through the two connection slots 51. The upper cover 713 and the main body 71 pertain to different parts. Four sides of the upper cover 713 are formed with downward connection flanges 714. An inner surface of the connection flange 714 corresponding to the elastic locking piece 711 of the fixing piece 710 of the main body is formed with an engaging slot 715, which is a concave slot. The upper cover 713 covers the upper edge of the main body 71. The connection flange 714 is connected to the fixing piece 710 and located outside the engaging slot 715, and locks with the elastic locking piece 711.
The assembling processes will be described in the following. As shown in FIGS. 9 and 10, the plastic base 50 is assembled in the main body 71 of the metal housing and the first engagement hole 77 of the first engaging piece 75 of the side surface 73 engages with the engaging block 52 on the rear surface of the plastic base 50. Then, as shown in FIG. 11, the second engaging piece 76 passes through the longitudinal slot 78 of the first engaging piece 75 and the second engagement hole 79 engages with the engaging block 52 on the side surface of the plastic base 50. Finally, the upper cover 713 covers the upper edge of the main body 71. The connection flange 714 is connected to the fixing piece 710 and engages with the elastic locking piece 711 through the engaging slot 715. As shown in FIGS. 6 and 8, because the fixing piece 710 retracts inward to form a step with each surface of the main body 71, the connection flange 714 can be flush with each surface of the main body 71 when the upper cover 713 covers the upper edge of the main body 71.
The invention has the following advantages.
First, the metal housing is divided into the main body 71 and the upper cover 713. After the upper cover 713 covers the main body 71, the plate surfaces thereof are flush with each other without overlapped folded edges such that the exterior may be glorified.
Second, the main body 71 includes circumferential surfaces including two side surfaces, one front surface and one rear surface. So, the developed main body is a simple rectangle. In addition, the upper cover 713 is also a simple rectangle. So, the wasted material being cut out during the manufacturing phase is very small, and the material can be greatly saved.
Third, the second engaging piece 76 passes through the longitudinal slot 78 of the first engaging piece 75. So, the first and second engaging pieces 75 and 76 may be shield by the rear surface 74 and the side surface 73 of the main body, such that the engaging portions can be hidden.
As shown in FIG. 12, the second embodiment is almost the same as the first embodiment except that one side of the upper cover 713 of the metal housing 70 is integrally connected with the upper edge of the front surface of the main body 71.
As shown in FIGS. 13 and 14, the third embodiment is almost the same as the first embodiment except that the connector of the third embodiment is a dual-layer USB socket cooperating with a high speed serial bus (e.g., IEEE 1394) socket. That is, the plastic base 50 has two connection slots 51 for USB plugs and one connection slot 53 for the IEEE 1394 plug.
As shown in FIGS. 15 and 16, the fourth embodiment is almost the same as the first embodiment except that the connector of this embodiment is a dual-layer USB socket cooperating with a network transmission (e.g., RJ45) socket. That is, the plastic base 50 has two connection slots 51 for USB plugs and one connection slot 54 for the RJ45 plug.
Referring to FIGS. 17 to 19, a three-jack electrical connector to be connected to earphone or microphone plugs according to the fifth embodiment of the invention includes a plastic base 80, terminals 100 and a metal housing 90.
The front end of the plastic base 80 is formed with three connection holes 81 arranged vertically, and the rear surface of the plastic base 80 is formed with slots 82.
The terminals 100 are disposed in the plastic base 50. Each terminal 100 has a contact located inside the connection hole 81 of the plastic base 80, and a pin 102 extending out of the plastic base 80.
The metal housing 90 having a top surface 91, two side surfaces 92, a front surface 93 and a rear surface 94 covers the plastic base 80. The front surface 93 is formed with three circular openings 94 for exposing the connection hole 81 of the plastic base to the outside. The top surface 91 is divided into a first surface 95 and a second surface 96. The first and second surfaces 95 and 96 are respectively connected to the upper edges of the two side surfaces 92. Each of the surfaces 95 and 96 has a folded edge 97 against which the rear surface 94 rests. The folded edge 97 is pressed to form an elastic sheet 99 for engaging the slot 82 of the plastic base 80. The middle of the upper edge of the front surface 93 is also formed with a folded edge 98 for resting against the first and second surfaces 95 and 96. In addition, the rear surface 94 is formed with a folded edge 910.
Furthermore, the metal housing 90 has a locking device, which comprises a first engaging piece 911 and three second engaging pieces 912. The first engaging piece 911 is disposed at a rear end of one of the side surfaces 92 and is depressed relative to the side surface 92 to form a depression. Three longitudinal slots 913 are formed at a connection portion between the first engaging piece 911 and the side surface 92. The three second engaging pieces 912 are disposed at the folded edge 910 of the rear surface and are prodded and pressed to form an elastic engaging part 914.
During assembly, the plastic base 80 is first placed into the metal housing 90, the elastic sheet 99 engages with the slot 82 of the plastic base 80, and then the rear surface 94 is closed to press the folded edge 98. The folded edge 910 contacts the first engaging piece 911 and is then flush with the side surface 92. The second engaging piece 912 passes through the longitudinal slot 913. The elastic engaging part 914 bounces to rest against an inner edge of the first engaging piece 911.
As shown in FIG. 20, the connector of the sixth embodiment is almost the same as that of the fifth embodiment except that the connector of this embodiment is a six-jack electrical connector. That is, the metal housing 90 covers two plastic bases 80 each formed with three connection holes 81.
As shown in FIGS. 21 and 22, the seventh embodiment is almost the same as the fifth embodiment except that the rear surface 94 of the metal housing 90 of the seventh embodiment is divided into two half surfaces respectively connected to the two side surfaces 92. An edge of one of the half surfaces is formed with a first engaging piece 911. The first engaging piece 911 is formed with four sets of engaging holes 915 and longitudinal slots 913. The engaging hole 915 communicates with its corresponding longitudinal slot 913 to form a “T” shape. The longitudinal slot 913 is longer than the engaging hole 915. The edge of the other one of the half surfaces is formed with four sets of second engaging pieces 912 each having the “T” shape. During assembly, the second engaging piece 912 passes through the longitudinal slot 913 and then engages with the engaging hole 915.
While the invention has been described by way of examples and in terms of preferred embodiments, it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.

## Claims

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.