A screw terminal

Abstract

The present invention discloses a screw-type terminal block, including a housing, a conductive member is fixedly installed inside the housing, the end of the conductive member is located in a wire pressing frame, and the wire can be fixedly clamped between the wire pressing frame and the conductive member by tightening the screws. The wire pressing frame is composed of an upper nut block and a lower U-shaped clamp, protrusions are provided on both sides of the nut block, and clamping holes are provided on both sides of the U-shaped clamp, the protrusions and the clamping holes are snap-connected, an inwardly inclined inclined guide surface is provided on the upper side of the protrusion, a dividing groove is provided in the middle of the bottom of the U-shaped clamp, and anti-slip teeth are formed on the outside of the dividing groove. The wire pressing frame of the present invention has a good self-locking effect, when the nut block moves upward, the inwardly inclined inclined guide surface on the protrusion can act on the clamping hole of the U-shaped clamp, and the U-shaped clamp is deformed inwardly to achieve locking; the bottom of the U-shaped clamp is provided with a dividing groove and anti-slip teeth, which can increase the friction when clamping the wire, and the wire is less likely to be pulled out.

Description

Technical Field

[0001] The invention relates to the technical field of wiring terminals, in particular to a screw type wiring terminal. Background Art

[0002] The grounding connection in electrical equipment needs to be achieved by a screw-type electrical terminal. The UT series standard terminal is a screw connection terminal, which can realize maintenance-free wire connection. The terminal screws will not loosen under high vibration conditions. In the Chinese patent with publication number CN203250862U, an electrical terminal for electrical connection is disclosed, which is composed of an integrated insulating part, a wire pressing screw, a conductor, a wire pressing frame, and a grounding contact pin. The defects of the above-mentioned prior art are: the self-locking effect of the deformation of the top of the wire pressing frame is poor, and the inner wall below the square hole of the wire pressing frame is smooth, and the friction is small, which makes the wire easy to pull out. Summary of the invention

[0003] The present invention aims to solve the problems existing in the prior art and provides a screw-type terminal block with large deformation, good self-locking effect and less possibility for the wire to be pulled out.

[0004] The present invention solves the technical problem by adopting a technical solution: a screw-type terminal block comprises a shell, the shell is provided with a wiring hole and an operating hole, a wire pressing frame is provided in the wiring hole, a screw is provided in the operating hole, the screw is threadedly connected to the screw hole at the upper end of the wire pressing frame, a conductive part is fixedly installed inside the shell, the end of the conductive part is located in the wire pressing frame, and the wire can be fixedly clamped between the wire pressing frame and the conductive part by tightening the screw, the wire pressing frame is composed of an upper nut block and a lower U-shaped clamp, protrusions are provided on both sides of the nut block, and clamping holes are provided on both sides of the U-shaped clamp, the protrusions are snap-connected with the clamping holes, an inwardly inclined inclined guide surface is provided on the upper side of the protrusion, a dividing groove is provided in the middle of the bottom of the U-shaped clamp, and anti-slip teeth are formed on the outer side of the dividing groove, a section of folded edge is provided on the upper side of the end of the conductive part, and a notch is provided on one side of the folded edge, the screw is threadedly connected to the nut block, and an annular clamping groove is provided at the lower end of the screw, and the annular clamping groove cooperates with the notch for rotational connection.

[0005] For further improvement, two anti-slip grooves are stamped and formed on the lower side of the end of the conductive part.

[0006] For further improvement, a V-shaped limiting groove is provided between the two anti-slip grooves, and a conical head is provided at the lower end of the screw, and the conical head matches the shape of the V-shaped limiting groove.

[0007] For further improvement, a plug connector is provided in the middle of the conductive part, and the plug connector is plugged and matched with a socket provided on the shell, and two conductive clamps electrically connected to each other are provided at the bottom of the plug connector.

[0008] For further improvement, a safety compartment is provided on the top of the plug connector, and a fuse is fixedly installed in the safety compartment.

[0009] For further improvement, the safety compartment is provided with a button slidably mounted, the side wall of the button is provided with an installation groove, both ends of the installation groove are provided with connecting grooves, a conductive spring is provided at the bottom of the safety compartment below the connecting groove, and a pull rod guide groove mechanism for pressing and self-locking is provided between the button and the safety compartment.

[0010] For further improvement, an inverted V-shaped ramp is provided at the bottom of the inner hole of the U-shaped clamp.

[0011] For further improvement, both ends of the inverted V-shaped ramp are provided with V-shaped notches.

[0012] The beneficial effects of the present invention are: 1. The wire pressing frame of the present invention has a good self-locking effect. When the nut block moves upward, it can act on the clamping hole of the U-shaped clamp through the inwardly inclined inclined guide surface on the protrusion, and the U-shaped clamp is deformed inwardly to achieve locking; 2. The bottom of the U-shaped clamp is provided with a dividing groove and anti-slip teeth, which can increase the friction when clamping the wire, and the wire is less likely to be pulled out; 3. The end of the conductive part is provided with a folded edge, which is rotatably connected to the screw. When the screw presses down the conductive part, the force is uniform and stable, the conductive part is not easy to deform, and the effect of clamping the wire is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the product structure;

[0014] Figure 2 for Figure 1 Sectional view at AA in FIG. (shell omitted);

[0015] Figure 3 This is the state diagram of the wire pressing frame when clamping the wire;

[0016] Figure 4 is a schematic diagram of the structure of the plug connector;

[0017] Explanation of the reference numerals: 100, housing, 110, wiring hole, 120, operating hole, 200, wire pressing frame, 210, nut block, 211, protrusion, 212, inclined guide surface, 220, U-shaped clamp, 221, clamp hole, 222, dividing groove, 223, anti-slip teeth, 224, inverted V-shaped ramp, 225, V-shaped notch, 300, screw, 310, annular clamping groove, 320, conical head, 400, conductive part, 410, folded edge, 411, notch, 412, anti-slip groove, 413, V-shaped limit groove, 420, plug connector, 421, conductive clamping claw, 422, safety compartment, 423, fuse, 430, button, 431, installation groove, 432, connecting groove, 433, conductive spring, 434, pull rod guide groove mechanism. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings:

[0019] Refer to the attached Figure 1-2 : A screw-type terminal block in this embodiment 1 includes a housing 100, the housing 100 is provided with a wiring hole 110 and an operating hole 120, a wire pressing frame 200 is provided in the wiring hole 110, a screw 300 is provided in the operating hole 120, the screw 300 is threadedly connected with the screw hole at the upper end of the wire pressing frame 200, a conductive member 400 is fixedly installed inside the housing 100, the end of the conductive member 400 is located in the wire pressing frame 200, and the wire can be fixedly clamped between the wire pressing frame 200 and the conductive member 400 by tightening the screw 300, the wire pressing frame 200 is composed of an upper nut block 210 and a lower U-shaped clamp 220, the nut block A protrusion 211 is provided on both sides of 210, and a clamping hole 221 is provided on both sides of the U-shaped clamp 220. The protrusion 211 is snap-connected with the clamping hole 221. An inwardly inclined inclined guide surface 212 is provided on the upper side of the protrusion 211. A dividing groove 222 is provided in the middle of the bottom of the U-shaped clamp 220, and an anti-slip tooth 223 is formed on the outer side of the dividing groove 222. A folded edge 410 is provided on the upper side of the end of the conductive member 400, and a notch 411 is provided on one side of the folded edge 410. The screw 300 is threadedly connected to the nut block 210, and an annular clamping groove 310 is provided at the lower end of the screw 300. The annular clamping groove 310 cooperates with the notch 411 for rotational connection.

[0020] When in use, insert the wire into the wiring hole 110, cross the dividing groove 222, and place it between the end of the upper conductive member 400 and the lower wire pressing frame 200. Use a screwdriver to tighten the screw 300. Under the drive of the thread, the nut block 210 moves up, and the protrusion 211 drives the U-shaped clamp 220 to move up to clamp the wire. Figure 3 As shown, during the clamping process, the upper edge of the clamping hole 221 slides inward along the inclined guide surface 212 on the upper side of the protrusion 211, so that the opening of the upper part of the U-shaped clamp 220 is tightened inward, forming a self-locking, and realizing the anti-loosening fixation of the wire. When the U-shaped clamp 220 is pulled to expand, it is necessary to overcome the resistance of sliding upward along the inclined guide surface 212. When the U-shaped clamp 220 clamps the wire upward, two clamping points are formed on the left and right sides of the dividing groove 222, and part of the wire will be squeezed into the middle dividing groove 222. When the wire is pulled outward, the anti-slip teeth 223 act on it. The dividing groove 222 and the anti-slip teeth 223 can effectively increase the friction force and prevent the wire from loosening. The end of the conductive member 400 is provided with a folded edge, and the folded edge is rotatably connected to the screw. When the screw 300 presses the conductive member 400 relatively downward, the force is uniform and stable, and the conductive member 400 is not easy to deform, which improves its effect of clamping the wire.

[0021] Embodiment 2, on the basis of embodiment 1, two anti-skid grooves 412 are stamped and formed on the lower side of the end of the conductive part 400. The function of the anti-skid groove 412 is equivalent to the anti-skid pattern, which improves the contact friction with the wire. A V-shaped limit groove 413 is provided between the two anti-skid grooves 412, and a conical head 320 is provided at the lower end of the screw 300, and the conical head 320 matches the shape of the V-shaped limit groove 413. The V-shaped limit groove 413 can improve the screw 300 and the conductive part 400, so that the force on the screw 300 can be evenly applied to the conductive part 400, avoiding excessive pressure causing excessive bending deformation of the conductive part 400. An inverted V-shaped ramp 224 is provided at the bottom of the inner hole of the U-shaped clamp 220, and the inverted V-shaped ramp 224 is high in the middle and low on both sides. When pressed tightly, the wire adapts to this shape, which has the effect of preventing it from falling off. The two ends of the inverted V-shaped ramp 224 are provided with V-shaped notches 225 , and when the wire is pulled downward, the V-shaped notches 225 can clamp the wire.

[0022] Embodiment 3, on the basis of Embodiment 1 or 2, a plug connector 420 is provided in the middle of the conductive member 400, and the plug connector 420 is plugged and matched with the socket provided on the housing 100, and two conductive clamps 421 electrically connected to each other are provided at the bottom of the plug connector 420. After the plug connector 420 is unplugged from the housing 100, the middle of the conductive member 400 is directly disconnected to cut off the circuit. After the plug connector 420 is inserted from the housing 100, the two conductive clamps 421 contact and connect the conductive member 400 to conduct the circuit.

[0023] A safety compartment 422 is provided on the top of the plug connector 420, and a fuse 423 is fixedly installed in the safety compartment 422. Both ends of the fuse 423 are electrically connected to the two conductive clamps 421. When the circuit is short-circuited, the fuse 423 melts to protect the circuit.

[0024] The safety compartment 422 is provided with a button 430 slidably mounted thereon, a mounting groove 431 is provided on the side wall of the button 430, connecting grooves 432 are provided at both ends of the mounting groove 431, a conductive spring 433 is provided at the bottom of the safety compartment 422 below the connecting groove 432, and a pull rod guide groove mechanism 434 for pressing and self-locking is provided between the button 430 and the safety compartment 422.

[0025] The pull rod guide groove mechanism 434 is composed of a guide groove and a pull rod. The guide groove is set on the button 430. One end of the pull rod is rotatably connected to the bottom of the safety compartment 422. The claw hook at the other end of the pull rod is located in the guide groove. In the design of the guide groove, each turn is designed with a step, so that the pull rod can only move along a specific trajectory and cannot go in reverse. The structural principle is the same as the mechanism used in the SD card. The function is that the SD card is automatically stuck in it when it is inserted, and it pops out again when it is pressed again. The fuse 423 is fixedly installed on the card holder in the installation groove 431, as shown in the attached Figure 4As shown, when the button 430 is pressed, the pull rod guide groove mechanism 434 automatically clamps it in the safety compartment 422, and the conductive spring 433 compresses and contacts the metal sheet of the fuse 423 to achieve circuit conduction. When the fuse needs to be replaced or the circuit needs to be disconnected, the button 430 is pressed again, the pull rod guide groove mechanism 434 is automatically unlocked, and the button 430 is automatically popped out under the action of the conductive spring 433, exposing the installation groove 431, making it convenient to remove the fuse 423 or disconnect the circuit.

[0026] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A screw-type terminal, comprising a housing (100), the housing (100) being provided with a wiring hole (110) and an operating hole (120), a wire pressing frame (200) being provided in the wiring hole (110), a screw (300) being provided in the operating hole (120), the screw (300) being threadedly connected with a screw hole at an upper end of the wire pressing frame (200), a conductive member (400) being fixedly installed inside the housing (100), an end of the conductive member (400) being located in the wire pressing frame (200), and a wire being fixedly clamped between the wire pressing frame (200) and the conductive member (400) by tightening the screw (300), characterized in that: The wire pressing frame (200) is composed of an upper nut block (210) and a lower U-shaped clamp (220), the nut block (210) is provided with protrusions (211) on both sides, the U-shaped clamp (220) is provided with clamping holes (221) on both sides, the protrusions (211) and the clamping holes (221) are snap-connected, the upper side of the protrusion (211) is provided with an inwardly inclined inclined guide surface (212), and the bottom middle of the U-shaped clamp (220) is provided with a partition The outer side of the dividing groove (222) is formed with anti-slip teeth (223); the upper side of the end of the conductive member (400) is provided with a folded edge (410); one side of the folded edge (410) is provided with a notch (411); the screw (300) is threadedly connected to the nut block (210); the lower end of the screw (300) is provided with an annular groove (310); the annular groove (310) and the notch (411) are matched to be rotatably connected.

2. A screw terminal according to claim 1, characterized in that: Two anti-slip grooves (412) are stamped and formed on the lower side of the end of the conductive member (400).

3. A screw terminal according to claim 2, characterized in that: A V-shaped limiting groove (413) is provided between the two anti-slip grooves (412), and a conical head (320) is provided at the lower end of the screw (300), and the conical head (320) matches the shape of the V-shaped limiting groove (413).

4. The screw terminal according to claim 1, characterized in that: A plug connector (420) is provided in the middle of the conductive member (400), the plug connector (420) is plugged into and matched with a socket provided on the housing (100), and two conductive clamping claws (421) electrically connected to each other are provided at the bottom of the plug connector (420).

5. A screw terminal according to claim 4, characterized in that: A safety compartment (422) is provided on the top of the plug connector (420), and a fuse (423) is fixedly installed in the safety compartment (422).

6. A screw terminal according to claim 5, characterized in that: The safety compartment (422) is provided with a button (430) slidably mounted thereon, a mounting groove (431) is provided on the side wall of the button (430), connecting grooves (432) are provided at both ends of the mounting groove (431), a conductive spring (433) is provided at the bottom of the safety compartment (422) below the connecting groove (432), and a pull rod guide groove mechanism (434) for pressing and self-locking is provided between the button (430) and the safety compartment (422).

7. The screw terminal according to claim 1, characterized in that: An inverted V-shaped ramp (224) is provided at the bottom of the inner hole of the U-shaped clamp (220).

8. The screw terminal according to claim 7, characterized in that: V-shaped notches (225) are provided at both ends of the inverted V-shaped ramp (224).

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