Improved mechanism of electric connector

Abstract

The invention discloses an improved mechanism of an electric connector, which is characterized in that a wiring cavity is formed on the inner side of a plastic shell, a wire inlet and a screw inlet which are communicated with the wiring cavity are formed on the side wall of the plastic shell, a fixed terminal is fixed in the wiring cavity, and a pin of the fixed terminal extends out of the outer side of the plastic shell. A stud of the locking screw extends into the wiring cavity through a screw inlet in the plastic shell and can be in threaded connection with a threaded hole of the fixed terminal, the movable terminal contained in the wiring cavity is installed on the stud of the locking screw in an axial locking mode, and the movable terminal is stopped on the inner side wall of the wiring cavity. The movable terminal can move in the wiring cavity along the axial direction of the locking screw along with the locking screw, the movable terminal and the fixed terminal can clamp a wire entering the wiring cavity through the wire inlet, and an O-shaped ring on the wire can be arranged on the outer side of a stud of the locking screw in a sleeving mode. And the situation that the locking screw is lost can be avoided.

Description

Technical Field

[0001] The invention relates to an electric connector, and in particular to an improved mechanism of the electric connector. Background Art

[0002] The existing terminal block connector for wiring is screwed into the screw hole of the terminal by screwing the stud of the screw, and the stud of the screw is inserted into the O-ring at the end of the wire, and the O-ring of the wire is clamped by the head of the screw and the surface of the terminal, or the conductor of the bare wire is directly clamped by the head of the screw and the surface of the terminal to achieve the conductive connection between the wire and the connector. When wiring, the connector of this structure needs to completely unlock the screw. After unlocking, the screw is separated from the connector and is easy to fall off, which is not conducive to locking wire assembly. Summary of the invention

[0003] In order to make up for the above shortcomings, the present invention provides an improved mechanism of an electrical connector, which can prevent the screws from being separated from the connector during wire assembly, thereby facilitating wire locking assembly.

[0004] The technical solution adopted by the present invention to solve its technical problems is: an improved mechanism of an electrical connector, comprising a plastic shell, a fixed terminal, a movable terminal and a locking screw, a wiring cavity is formed on the inner side of the plastic shell, a line inlet connected to the wiring cavity is formed on the side wall of the plastic shell, a screw inlet connected to the wiring cavity is also provided on the side wall of the plastic shell, the fixed terminal is fixedly installed in the wiring cavity, a pin extending to the outside of the plastic shell is formed on the fixed terminal, a threaded hole is also provided on the fixed terminal, a stud of the locking screw extends into the wiring cavity through the screw inlet on the plastic shell, and the stud of the locking screw can be screwed with the threaded hole of the fixed terminal, the movable terminal is axially stopped and installed on the stud of the locking screw, the movable terminal is accommodated in the wiring cavity, the movable terminal is stopped on the inner wall of the wiring cavity, the movable terminal can move axially along the locking screw in the wiring cavity with the locking screw, the movable terminal and the fixed terminal can clamp the wire entering the wiring cavity through the line inlet, and the O-ring on the wire can be sleeved on the outside of the stud of the locking screw.

[0005] As a further improvement of the present invention, an elastic member is further provided, and the elastic member provides an elastic restoring force to the movable terminal in a direction away from the fixed terminal.

[0006] As a further improvement of the present invention, a guide piece parallel to the locking screw stud is provided on at least one side wall of the movable terminal, and the elastic member is a compression spring, which is sleeved on the outside of the guide piece, one end of the compression spring is tightly against the side surface of the movable terminal facing the fixed terminal, and the other end of the compression spring is tightly against the fixed terminal or the inner wall of the wiring cavity.

[0007] As a further improvement of the present invention, the guide piece is provided with a stop step surface with an increased width dimension at the root near the fixed terminal, and the guide piece is also provided with a concave and convex spring fixing structure at the root near the fixed terminal. One end of the compression spring stops on the stop step surface, the coil at one end of the compression spring is accommodated in the groove of the spring fixing structure, and the protruding structure of the spring fixing structure is inserted in the coil gap at one end of the compression spring.

[0008] As a further improvement of the present invention, the fixed terminal is in a U-shaped structure, and its threaded hole is formed on the bottom surface of the U-shaped structure. The pin is integrally formed at the end of the two side walls of the U-shaped structure, and a barb structure is formed on the two side walls of the U-shaped structure. Two holding holes are provided in parallel and spaced apart on the side walls of the wiring cavity of the plastic shell. The two side walls of the U-shaped structure of the fixed terminal are tightly inserted into the two holding holes, and the barb structures on the two side walls of the U-shaped structure of the fixed terminal are embedded in the side walls of the holding holes, and the pin passes through the holding holes to the outside of the plastic shell.

[0009] As a further improvement of the present invention, the plastic shell is an integrally molded structure, and an assembly opening structure is formed on a side wall of the wiring cavity that is opposite to the side wall where the screw entrance is located. The pre-assembled structure formed by the fixed terminal, the movable terminal and the locking screw can be inserted into the wiring cavity through the assembly opening structure, and the locking screw and its head can be inserted into the screw entrance. The side walls opposite to the two holding holes are connected to the assembly opening structure, and a stop step is formed on the inner side wall of at least one holding hole. A step surface with a reduced root width is formed on at least one side wall of the U-shaped structure of the fixed terminal, and the step surface stops on the stop step on the inner side wall of the holding hole, thereby limiting the insertion depth of the fixed terminal from the assembly opening structure into the wiring cavity.

[0010] As a further improvement of the present invention, a bending stop wall extending toward the outside of the U-shaped structure is further provided on the side wall of the U-shaped structure of the fixed terminal, and the other end of the compression spring is tightly against the bending stop wall of the fixed terminal. An avoidance gap is formed in the middle of the bending stop wall, and the end of the guide piece of the movable terminal can be inserted into the avoidance gap.

[0011] As a further improvement of the present invention, a compression spring guide accommodating groove matching the shape of the compression spring is further provided on the inner side wall of the wiring cavity of the plastic housing, and the compression spring is accommodated in the compression spring guide accommodating groove.

[0012] As a further improvement of the present invention, at least one guide groove extending along the axial direction of the locking screw is further provided on the inner wall of the wiring cavity of the plastic shell, and at least one outwardly protruding guide protrusion is provided on the side wall of the movable terminal, and the guide protrusion can be slidably inserted in the guide groove.

[0013] As a further improvement of the present invention, the locking screw neck is formed with an annular groove with a reduced diameter, the movable terminal is sleeved on the annular groove of the locking screw neck, and the movable terminal is stopped on the side wall of the annular groove along the axial direction of the locking screw, and a spring gasket is also sleeved in the annular groove of the locking screw neck, the spring gasket has one end tightly against the locking screw head, and the other end tightly against the side surface of the movable terminal facing away from the fixed terminal, and the movable terminal is also provided with a protrusion for pressing the wire on the side surface facing the fixed terminal.

[0014] The beneficial technical effect of the present invention is as follows: the present invention installs a movable terminal on the locking screw, and while the movable terminal presses the wire, it prevents the screw from detaching from the plastic shell when the wire is withdrawn, thereby preventing the locking screw from being lost. The present invention also provides an elastic reset force to the movable terminal through an elastic member, so that the movable terminal remains away from the fixed terminal after the wire is withdrawn, which facilitates the smooth insertion of the wire during the next wiring. The plastic shell of the present invention adopts an integrated structure, which reduces the manufacturing and assembly costs. The present invention has a simple structure, low product production cost, easy use, firm and stable wiring, stable support and connection of the PCB to the product, and the product is not easy to detach from the PCB after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of the present invention;

[0016] Figure 2 A three-dimensional view of the present invention;

[0017] Figure 3 It is a wiring state structural principle diagram of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the present invention in the back-line state;

[0019] Figure 5 It is a three-dimensional diagram of the pre-assembled structure of the present invention;

[0020] Figure 6 It is a front view of the pre-assembled structure of the present invention;

[0021] Figure 7 It is a first stereoscopic view of the fixed terminal of the present invention;

[0022] Figure 8 It is a second stereoscopic view of the fixed terminal of the present invention;

[0023] Fig. 9 It is a front view of the fixed terminal of the present invention;

[0024] Fig.10 It is a three-dimensional diagram of the assembly structure of the locking screw and the movable terminal of the present invention. DETAILED DESCRIPTION

[0025] Embodiment: An improved mechanism of an electrical connector, comprising a plastic housing 1, a fixed terminal 2, a movable terminal 3 and a locking screw 4, wherein a wiring cavity 11 is formed inside the plastic housing 1, a wire inlet 12 connected to the wiring cavity 11 is formed on the side wall of the plastic housing 1, and a screw inlet 13 connected to the wiring cavity 11 is also provided on the side wall of the plastic housing 1, wherein the fixed terminal 2 is fixedly installed in the wiring cavity 11, a pin 21 extending to the outside of the plastic housing 1 is formed on the fixed terminal 2, and a threaded hole 22 is also provided on the fixed terminal 2, and the stud of the locking screw 4 is passed through the plastic housing 1. The screw entrance 13 extends into the wiring cavity 11, and the stud of the locking screw 4 can be screwed with the threaded hole 22 of the fixed terminal 2, the movable terminal 3 is axially stopped and installed on the stud of the locking screw 4, the movable terminal 3 is accommodated in the wiring cavity 11, the movable terminal 3 is stopped on the inner wall of the wiring cavity 11, the movable terminal 3 can move axially along the locking screw 4 in the wiring cavity 11 with the locking screw 4, the movable terminal 3 and the fixed terminal 2 can clamp the wire entering the wiring cavity 11 through the wire inlet 12, and the O-ring on the wire can be sleeved on the outside of the stud of the locking screw 4.

[0026] When in use, the pin 21 of the fixed terminal 2 is welded on the circuit board, which can increase the current value of the product and improve the supporting strength of the product to ensure the stability of the product. The fixed terminal 2 can withstand the downward positive pressure from the top of the locking screw 4 and can be transferred to the PCB board. The movable terminal 3 is blocked by the inner wall of the wiring cavity 11 and cannot be detached from the screw entrance 13. Therefore, the locking screw 4 will not fall off the plastic shell 1 after the wire is withdrawn, thereby avoiding the loss of the locking screw 4.

[0027] An elastic member is also provided, which provides an elastic reset force to the movable terminal 3 in the direction away from the fixed terminal 2. The elastic member provides a reset elastic force to the locking screw 4, which can realize the vertical free springing of the locking screw 4, and facilitates the wiring of the bare wire or O / Y terminal.

[0028] A guide piece 31 parallel to the stud of the locking screw 4 is provided on at least one side wall of the movable terminal 3, and the elastic member is a compression spring 5, which is sleeved on the outside of the guide piece 31, and one end of the compression spring 5 is tightly pressed against the side surface of the movable terminal 3 facing the fixed terminal 2, and the other end of the compression spring 5 is tightly pressed against the fixed terminal 2 or the inner wall of the wiring cavity 11. The compression spring 5 is sleeved on the guide piece 31, which can guide the elastic expansion and contraction of the compression spring 5 to prevent the lateral deformation of the compression spring 5 from affecting the normal wiring.

[0029] The guide piece 31 is provided with a stop step surface 32 with an increased width at the root near the fixed terminal 2, and the guide piece 31 is also provided with an undulating spring fixing structure 33 at the root near the fixed terminal 2. One end of the compression spring 5 is stopped on the stop step surface 32, and the coil at one end of the compression spring 5 is accommodated in the groove of the spring fixing structure 33, and the convex structure of the spring fixing structure 33 is inserted into the coil gap at one end of the compression spring 5. The undulating spring fixing structure 33 on the guide piece 31 can be fixed and positioned with one end of the compression spring 5 to prevent the compression spring 5 from moving in the wiring cavity 11.

[0030] The fixed terminal 2 is in a U-shaped structure, and its threaded hole 22 is formed on the bottom surface of the U-shaped structure. The pin 21 is integrally formed at the ends of the two side walls of the U-shaped structure, and a barb structure 23 is formed on the two side walls of the U-shaped structure. Two holding holes 14 are arranged in parallel and spaced on the side walls of the wiring cavity 11 of the plastic housing 1. The two side walls of the U-shaped structure of the fixed terminal 2 are tightly inserted into the two holding holes 14, and the barb structures 23 on the two side walls of the U-shaped structure of the fixed terminal 2 are embedded in the side walls of the holding holes 14, and the pin 21 passes through the holding holes 14 to the outside of the plastic housing 1. The fixed terminal 2 adopts a U-shaped structure, and its two side walls are fixed in the holding holes 14 on the side walls of the wiring cavity 11 by barbs, so that it is firmly and stably fixed.

[0031] The plastic housing 1 is an integrally formed structure, and an assembly opening structure 15 is formed on a side wall of the wiring cavity 11 that is opposite to the side wall where the screw entrance 13 is located. The pre-assembled structure formed by the fixed terminal 2, the movable terminal 3 and the locking screw 4 can be inserted into the wiring cavity 11 through the assembly opening structure 15, and the locking screw 4 and its head can be inserted into the screw entrance 13. The opposite side walls of the two retaining holes 14 are connected to the assembly opening structure 15, and a stop step is formed on the inner side wall of at least one retaining hole 14. A step surface (24) with a reduced root width is formed on at least one side wall of the U-shaped structure of the fixed terminal 2, and the step surface stops on the stop step on the inner side wall of the retaining hole 14, thereby limiting the insertion depth of the fixed terminal 2 from the assembly opening structure 15 to the wiring cavity 11. The plastic shell 1 adopts an integrated plastic molding structure, which can reduce plastic parts, thereby reducing assembly processes and reducing costs. During assembly, the locking screw 4 equipped with the compression spring 5 and the movable terminal 3 is first pre-connected to the threaded hole 22 of the fixed terminal 2, and then the pre-assembled structure of the fixed terminal 2, the locking screw 4, the movable terminal 3 and the compression spring 5 is installed into the wiring cavity 11 through the assembly opening structure 15 at the bottom of the plastic shell 1. After being installed in place, the locking screw 4 and its head just extend into the screw entrance 13, and the two side walls of the U-shaped structure of the fixed terminal 2 are inserted into the two holding holes 14 of the plastic shell 1, and the step surfaces on the two side walls of the U-shaped structure stop on the stop steps formed on the inner side walls of the holding hole 14, and the barb structures 23 on the two side walls of the U-shaped structure penetrate into the flesh of the side walls of the holding hole 14, thereby realizing the fixed positioning of the fixed terminal 2 on the plastic shell 1. The above structure reduces the cost of the plastic shell 1 on the one hand, and also improves the assembly efficiency and reduces the assembly cost.

[0032] The U-shaped structure side wall of the fixed terminal 2 is also provided with a bending stop wall 25 extending toward the outside of the U-shaped structure. The other end of the compression spring 5 is tightly against the bending stop wall 25 of the fixed terminal 2. An escape notch 26 is formed in the middle of the bending stop wall 25. The end of the guide piece 31 of the movable terminal 3 can be inserted into the escape notch 26. The fixed terminal 2 adopts a metal stamping and bending integrated molding structure. The bending stop wall 25 adopts the side wall of the U-shaped structure of the fixed terminal 2 located on both sides of the pin 21 and is formed by bending after tearing. The torn part of the fixed terminal 2 is used as a spring support structure. The structure is simple and the cost is low. The torn part is flush with the bottom surface of the plastic shell 1. When the product is locked and stressed, the ends of the two side walls of the U-shaped structure of the fixed terminal 2 and the bottom surface of the bending stop wall 25 are in contact with the PCB surface, which can increase the support strength and make the terminal not easy to fall out or move under stress.

[0033] The inner wall of the wiring cavity 11 of the plastic housing 1 is also provided with a compression spring guide receiving groove 16 matching the shape of the compression spring 5, and the compression spring 5 is received in the compression spring guide receiving groove 16. The compression spring guide receiving groove 16 can receive and guide the elastic deformation of the compression spring 5 to avoid interference.

[0034] At least one guide groove 17 extending axially along the locking screw 4 is further provided on the inner side wall of the wiring cavity 11 of the plastic housing 1, and at least one outwardly protruding guide protrusion 34 is provided on the side wall of the movable terminal 3, and the guide protrusion 34 can be slidably inserted in the guide groove 17. When the movable terminal 3 moves up and down with the locking screw 4, the guide protrusion 34 thereon slides up and down in the guide groove, plays a guiding role, and prevents the movable terminal 3 from tilting and getting stuck when moving up and down.

[0035] The neck of the locking screw 4 is formed with an annular groove with a shrinking diameter, the movable terminal 3 is sleeved on the annular groove of the neck of the locking screw 4, and the movable terminal 3 is stopped on the side wall of the annular groove along the axial direction of the locking screw 4, and a spring gasket 6 is also sleeved in the annular groove of the neck of the locking screw 4, the spring gasket 6, one end of the spring gasket 6 is tightly against the head of the locking screw 4, and the other end of the spring gasket 6 is tightly against the side surface of the movable terminal 3 facing away from the fixed terminal 2, and the movable terminal 3 is also provided with a convex point 35 for pressing the wire on the side surface facing the fixed terminal 2. The above structure can make the movable terminal 3 and the locking screw 4 rotate relative to each other, and axially elastically contact, so as to avoid the shaking of the locking screw 4, and the convex point 35 on the movable terminal 3 can also press the wire and the O-ring thereon tightly to avoid poor contact.

Claims

1. An improved mechanism of an electrical connector, characterized in that: The invention comprises a plastic shell (1), a fixed terminal (2), a movable terminal (3) and a locking screw (4); a wiring cavity (11) is formed inside the plastic shell; a wire inlet (12) connected to the wiring cavity is formed on the side wall of the plastic shell; a screw inlet (13) connected to the wiring cavity is also provided on the side wall of the plastic shell; the fixed terminal is fixedly installed in the wiring cavity; a pin (21) extending to the outside of the plastic shell is formed on the fixed terminal; a threaded hole (22) is also provided on the fixed terminal; a screw hole (23) of the locking screw is provided on the side wall of the plastic shell; The column extends into the wiring cavity through the screw entrance on the plastic shell, and the stud of the locking screw can be screwed with the threaded hole of the fixed terminal. The movable terminal is axially stopped and installed on the stud of the locking screw. The movable terminal is accommodated in the wiring cavity. The movable terminal is stopped on the inner wall of the wiring cavity. The movable terminal can move axially along the locking screw in the wiring cavity with the locking screw. The movable terminal and the fixed terminal can clamp the wire entering the wiring cavity through the wire inlet, and the O-ring on the wire can be sleeved on the outside of the stud of the locking screw.

2. The improved mechanism of the electrical connector according to claim 1 is characterized in that: an elastic member is further provided, and the elastic member provides an elastic restoring force to the movable terminal in a direction away from the fixed terminal.

3. The improved mechanism of the electrical connector according to claim 2 is characterized in that: a guide piece (31) parallel to the locking screw stud is provided on at least one side wall of the movable terminal, and the elastic member is a compression spring (5), which is sleeved on the outside of the guide piece, one end of the compression spring is tightly against the side surface of the movable terminal facing the fixed terminal, and the other end of the compression spring is tightly against the fixed terminal or the inner wall of the wiring cavity.

4. The improved mechanism of the electrical connector according to claim 3 is characterized in that: the guide piece is provided with a stop step surface (32) with an increased width dimension near the root of the fixed terminal, and the guide piece is also provided with a concave and convex spring fixing structure (33) near the root of the fixed terminal, one end of the compression spring is stopped on the stop step surface, the coil at one end of the compression spring is accommodated in the groove of the spring fixing structure, and the protruding structure of the spring fixing structure is inserted in the coil gap at one end of the compression spring.

5. The improved mechanism of the electrical connector according to claim 3 is characterized in that: the fixed terminal is in a U-shaped structure, and its threaded hole is formed on the bottom surface of the U-shaped structure, the pin is integrally formed at the end of the two side walls of the U-shaped structure, and a barb structure (23) is formed on the two side walls of the U-shaped structure, and two holding holes (14) are provided on the side walls of the wiring cavity of the plastic shell in parallel and spaced apart, the two side walls of the U-shaped structure of the fixed terminal are tightly inserted into the two holding holes, the barb structures on the two side walls of the U-shaped structure of the fixed terminal are embedded in the side walls of the holding holes, and the pin passes through the holding holes to the outside of the plastic shell.

6. The improved mechanism of the electrical connector according to claim 5 is characterized in that: the plastic shell is an integrally formed structure, and an assembly opening structure (15) is formed on a side wall of the wiring cavity opposite to the side wall where the screw entrance is located, the pre-assembled structure formed by the fixed terminal, the movable terminal and the locking screw can be inserted into the wiring cavity through the assembly opening structure, and the locking screw and its head can be inserted into the screw entrance, the side walls opposite to the two holding holes are connected to the assembly opening structure, a stop step is formed on the inner side wall of at least one holding hole, and a step surface (24) with a reduced root width is formed on at least one side wall of the U-shaped structure of the fixed terminal, and the step surface stops on the stop step on the inner side wall of the holding hole to thereby limit the insertion depth of the fixed terminal from the assembly opening structure into the wiring cavity.

7. The improved mechanism of the electrical connector according to claim 5 or 6 is characterized in that: a bending stop wall (25) extending toward the outer side of the U-shaped structure is also provided on the side wall of the fixed terminal U-shaped structure, the other end of the compression spring is tightly against the bending stop wall of the fixed terminal, and an avoidance gap (26) is formed in the middle of the bending stop wall, and the end of the guide piece of the movable terminal can be inserted into the avoidance gap.

8. The improved mechanism of the electrical connector according to claim 5 is characterized in that: a compression spring guide receiving groove (16) matching the shape of the compression spring is also provided on the inner side wall of the wiring cavity of the plastic shell, and the compression spring is received in the compression spring guide receiving groove.

9. The improved mechanism of the electrical connector according to claim 1 is characterized in that: at least one guide groove (17) extending along the axial direction of the locking screw is also provided on the inner side wall of the wiring cavity of the plastic shell, and at least one outwardly protruding guide protrusion (34) is provided on the side wall of the movable terminal, and the guide protrusion can be slidably inserted in the guide groove.

10. The improved mechanism of the electrical connector according to claim 1 is characterized in that: the locking screw neck is formed with an annular groove with a contracted diameter, the movable terminal is sleeved on the annular groove of the locking screw neck, and the movable terminal is stopped on the side wall of the annular groove along the axial direction of the locking screw, and a spring gasket (6) is also sleeved in the annular groove of the locking screw neck, one end of the spring gasket is tightly against the locking screw head, and the other end of the spring gasket is tightly against the side surface of the movable terminal facing away from the fixed terminal, and a protrusion (35) for pressing the wire is also provided on the side surface of the movable terminal facing the fixed terminal.

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