Leakage current protection device for power plug

Patent metadata

Field	Value
Publication number	US-10770844-B2
Application number	US-201715808839-A
Country	US
Kind code	B2
Filing date	Nov 9, 2017
Priority date	Dec 14, 2016
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

A leakage current protection plug includes a body formed by a top cover and a base, a moving assembly disposed in the body, and output wires. The moving assembly includes a control circuit board, and a detector assembly and a trip assembly disposed on the control circuit board, wherein power input insertion plates and power output moving contact arms are assembled with the moving assembly. Each output moving contact arm is formed integrally and fixed to the detector assembly, and the output ends of the output moving contact arms are directly connected to the output conductor wires. The device has a simple overall structure and can be reliably assembled. By using integrally formed output moving contact arms to directly couple the input and output, it improves the accuracy of the leakage current detection parameters, reduces internal transfers and solder points, and reduces the size and cost of the plug.

First claim

What is claimed is:

1. A leakage current protection plug comprising:
a body formed by a top cover and a base;
a moving assembly disposed in the body, which includes a control circuit board and a detector assembly and a trip assembly disposed on the control circuit board;
two input insertion plates and two output moving contact arms assembled with the moving assembly; and
a cable connected to and extending away from the body, the cable including output conductor wires,
wherein each output moving contact arm is formed integrally and fixed to the detector assembly, and wherein output ends of the output moving contact arms are directly connected to the respective output conductor wires which are parts of the cable
wherein the trip assembly includes a trip coil frame, a trip plunger, and a trip spring, wherein the trip coil frame defines slots for accommodating the input insertion plates, wherein the movement assembly further includes a varistor, and wherein the trip coil frame further includes pin-receiving holes for receiving pins of the varistor.

2. The leakage current protection plug of claim 1 , wherein the top cover and the base are positioned with respect to each other via a snap structure and are fastened to each other by a fastening member, wherein the snap structure includes snap hooks or snap slots on the top cover and corresponding snap slots or snap hooks on the base.

3. The leakage current protection plug of claim 1 , further comprising a cable relief which covers a part of the output wires, wherein the cable relief is affixed to a fastening slot of the body.

4. The leakage current protection plug of claim 1 , wherein the output ends of the output moving contact arms are directly connected to the respective output conductor wires by soldered structures.

5. A leakage current protection plug comprising:
a body formed by a top cover and a base;
a moving assembly disposed in the body, which includes a control circuit board and a detector assembly and a trip assembly disposed on the control circuit board;
two input insertion plates and two output moving contact arms assembled with the moving assembly; and
output conductor wires,
wherein each output moving contact arm is formed integrally and fixed to the detector assembly,
wherein the detector assembly includes a detector coil box, and a detector coil and at least one metal plate disposed inside the detector coil box, and a detector coil cover which covers and fixes the detector coil and the metal plate, wherein the detector coil box defines a through hole for allowing the output moving contact arms to pass through, and wherein the output ends of the output moving contact arms pass through the through hole and are directly connected to the respective output conductor wires.

6. The leakage current protection plug of claim 5 , wherein the detector coil box, the detector coil, the metal plate, and the detector coil cover are affixed to each other by an adhesive.

7. The leakage current protection plug of claim 5 , further comprising a positioning structure for the output moving contact arms and the detector coil box, the positioning structure including a positioning hole or a positioning post on an assembly section of each output moving contact arm, and corresponding positioning posts or positioning holes on the detector coil box.

8. The leakage current protection plug of claim 7 , further comprising a moving contact cover for clamping the assembly sections of the output moving contact arms between the moving contact cover and the detector coil box, wherein the moving contact cover includes through holes which cooperate with the positioning posts of the detector coil box, and includes a positioning protrusion which is inserted into a corresponding slot on the detector coil box.

9. The leakage current protection plug of claim 8 , wherein the moving contact cover further includes positioning hooks which are inserted into corresponding mounting holes on the control circuit board.

10. The leakage current protection plug of claim 5 , wherein the trip assembly includes a trip coil frame, a trip plunger, and a trip spring, wherein the trip coil frame defines slots for accommodating the input insertion plates.

11. The leakage current protection plug of claim 10 , wherein the trip coil frame further includes a mounting plate cooperating with the detector coil box, wherein free sections of the output moving contact arms pass though position restriction slots on the mounting plate or the detector coil box.

12. A leakage current protection plug comprising:
a body formed by a top cover and a base;
a moving assembly disposed in the body, which includes a control circuit board and a detector assembly and a trip assembly disposed on the control circuit board;
two input insertion plates and two output moving contact arms assembled with the moving assembly; and
output conductor wires,
wherein each output moving contact arm is formed integrally and fixed to the detector assembly, and wherein output ends of the output moving contact arms are directly connected to the respective output conductor wires,
wherein the trip assembly includes a trip coil frame, a trip plunger, and a trip spring, wherein the trip coil frame defines slots for accommodating the input insertion plates, wherein the trip coil frame further includes a mounting plate cooperating with the detector coil box, wherein free sections of the output moving contact arms pass though position restriction slots on the mounting plate or the detector coil box.

Assignees

• Li Chengli
• Chengli Li

Inventors

• Nie Shengyun
• Li Chengli

Classifications

• H01R13/506

  assembled by snap action of the parts · CPC title

• H01H71/58

  actuated by push-button, pull-knob, or slide · CPC title

• H01H83/04

  with testing means for indicating the ability of the switch or relay to function properly · CPC title

• H02H3/334

  with means to produce an artificial imbalance for other protection or monitoring reasons or remote control (H02H3/338 takes precedence) · CPC title

• H01R13/5816

  for cables passing through an aperture in a housing wall, the separate part being captured between cable and contour of aperture · CPC title