Two-level latch mechanism for operation mechanism of circuit breaker

Patent metadata

Field	Value
Publication number	US-10199196-B2
Application number	US-201615569166-A
Country	US
Kind code	B2
Filing date	Apr 22, 2016
Priority date	Apr 28, 2015
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A two-level latch mechanism for an operation mechanism of a circuit breaker is provided. The operation mechanism includes: a tripping component, a left side plate, a right side plate, a latch, a half shaft, a lever, and a main shaft. The tripping component, the latch and the lever are mounted between the left side plate and the right side plate. The half shaft and the main shaft penetrate through the left side plate and the right side plate, and extend out of the left side plate and the right side plate. The tripping component, the latch, the half shaft, the lever, and the main shaft move in linkage. The tripping component includes a tripping buckle and a latch surface is disposed on a second end of the tripping buckle. The tripping component, the latch component and the half shaft component form a two-level latch.

First claim

What is claimed is:

1. A latch mechanism for operation mechanism of circuit breaker, wherein
the operation mechanism of circuit breaker comprises: a tripping component, a left side plate component, a right side plate component, a latch component, a half shaft component, a lever component and a main shaft component;
the tripping component, the latch component and the lever component are mounted between the left side plate component and the right side plate component, the half shaft component and the main shaft component penetrate through the left side plate component and the right side plate component and extend out of the left side plate component and the right side plate component;
the tripping component, the latch component, the half shaft component, the lever component and the main shaft component move in linkage;
wherein
the tripping component comprises a tripping buckle that comprises a first end and a second end, a latch surface is provide on the second end of the tripping buckle;
the latch component comprises a sheet metal piece rotating about a rotation shaft and a bearing mounted on the sheet metal piece;
the bearing is in contact with the latch surface, and the latch component limits the tripping component;
the half shaft component comprises a half shaft, the sheet metal piece is in contact with the half shaft, and the half shaft component limits the latch component;
the tripping component, the latch component and the half shaft component form a two-level latch.

2. The latch mechanism for operation mechanism of circuit breaker according to claim 1 , wherein
the tripping component comprises a tripping buckle, an upper connection rod and a lower connection rod, the upper connection rod is riveted to the tripping buckle, and the lower connection rod is riveted to the upper connection rod;
the second end of the tripping buckle is hook shaped, a second inclined surface is formed on an outer side of the hook, the second inclined surface is the latch surface.

3. The latch mechanism for operation mechanism of circuit breaker according to claim 2 , wherein the second inclined surface comprises an arc surface.

4. The latch mechanism for operation mechanism of circuit breaker according to claim 2 , wherein
the latch component comprises a sheet metal piece, a bearing, a latch component spring and a rotation shaft;
the sheet metal piece is installed on the rotation shaft, the latch component spring is fit on the rotation shaft, the latch component spring applies a spring force to the sheet metal piece, the bearing is installed on the sheet metal piece, the bearing is in contact with the second inclined surface, the latch component limits the tripping component.

5. The latch mechanism for operation mechanism of circuit breaker according to claim 4 , wherein the half shaft component comprises a half shaft, two ends of the half shaft are installed on the left side plate component and the right side plate component respectively, the sheet metal piece is in contact with the half shaft component.

6. The latch mechanism for operation mechanism of circuit breaker according to claim 4 , wherein when the second inclined surface of the tripping buckle is pressed and locked by the bearing, a force arm exists, the latch component spring drives the sheet metal piece to rotate about a rotation shaft with a torque generated by utilizing the force arm, so that an end portion of the sheet metal piece presses the half shaft.

7. The latch mechanism for operation mechanism of circuit breaker according to claim 6 , wherein in a process of re-closing, the bearing presses the second inclined surface of the tripping buckle and an adjacent surface of the second inclined surface, and the bearing is tangent to the second inclined surface and the adjacent surface.

8. The latch mechanism for operation mechanism of circuit breaker according to claim 6 , wherein the latch surface comprises an arc surface, the arc surface keeps the force arm unchanged.

9. The latch mechanism for operation mechanism of circuit breaker according to claim 2 , wherein a limiting hole is provided on the tripping buckle and a limiting pin is riveted in the limiting hole, the limiting pin limits a moving range of the upper connection rod, so as to limit a stroke of the operation mechanism which is in linkage with the tripping component.

10. The latch mechanism for operation mechanism of circuit breaker according to claim 9 , wherein
a rotation shaft is riveted to the first end of the tripping buckle, the rotation shaft is mounted on the left side plate component and the right side plate component, the limiting pin limits a moving range of the upper connection rod during a closing process and a free tripping process, so as to limit a stroke of the operation mechanism which is in linkage with the tripping component;
an upper end of the upper connection rod is riveted to the tripping buckle, an upper end of the lower connection rod is riveted to the middle of the upper connection rod.

11. The latch mechanism for operation mechanism of circuit breaker according to claim 10 , wherein the main shaft component comprises a main shaft with a plurality of cantilevers arranged thereon, the lower connection rod of the tripping component is in contact with the cantilever, and the tripping component is in linkage with the main shaft.

12. The latch mechanism for operation mechanism of circuit breaker according to claim 11 , wherein in a closing process, the main shaft rotates to drive the closing process, and a limit position of the rotation of the upper connection rod is limited by the limiting pin.

13. The latch mechanism for operation mechanism of circuit breaker according to claim 11 , wherein in a free tripping process, the upper connection rod is limited by the limiting pin, the lever component drives the main shaft to rotate through the tripping component, so as to complete the tripping process.

Assignees

• Seari Electric Technology Co Ltd
• Zhejiang Chint Electrics Co Ltd

Inventors

• Sun Jisheng
• Li Yong

Classifications

• H01H71/505

  Latching devices between operating and release mechanism · CPC title

• H01H71/10 Primary

  Operating or release mechanisms · CPC title

• H01H2235/01

  Spiral spring · CPC title

• H01H71/128 Primary

  Manual release or trip mechanisms, e.g. for test purposes (two similar push buttons for closing or resetting and opening or tripping H01H71/58; test switches for earth fault circuit breakers H01H83/04) · CPC title

• H01H9/24

  for interlocking two or more parts of the mechanism for operating contacts · CPC title