Switching mechanism of circuit breaker

Patent metadata

Field	Value
Publication number	US-10811209-B2
Application number	US-201916502732-A
Country	US
Kind code	B2
Filing date	Jul 3, 2019
Priority date	Jul 10, 2018
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

A switching mechanism of a circuit breaker includes a case, a handle rotatably coupled to a side plate fixed to the case, a U-pin coupled to a lower portion of the handle, a lever coupled to the U-pin, and a crossbar disposed in a mounting portion protruding from the case to be perpendicularly movable, the crossbar being moved by receiving contact pressure of the lever, wherein the lever is provided with a contact pressure portion formed in a curved surface on a lower surface thereof, to press the crossbar perpendicularly downward upon closing a circuit.

First claim

What is claimed is:

1. A switching mechanism of a circuit breaker, the switching mechanism comprising:
a case;
a handle rotatably coupled to a side plate fixed to the case;
a U-pin coupled to a lower portion of the handle;
a lever coupled to the U-pin; and
a crossbar disposed in a mounting portion protruding from the case to be perpendicularly movable, the crossbar being moved by receiving contact pressure of the lever,
wherein the lever is provided with a contact pressure portion protruding from the lever and formed in a curved surface on a lower surface thereof, to press the crossbar perpendicularly downward upon closing a circuit, and
wherein a surface of the contact pressure portion which is brought into contact with the crossbar is curved.

2. The switching mechanism of claim 1 , wherein the mounting portion is provided with a cutout portion formed in a shape of a linear groove so that the crossbar is movable up and down therein.

3. The switching mechanism of claim 1 , wherein the crossbar is provided with a head portion protruding from an upper surface thereof to come in contact with the lever.

4. The switching mechanism of claim 3 , wherein the head portion has an inner edge formed as a curved surface.

5. The switching mechanism of claim 1 , wherein the contact pressure portion comprises a first curved portion having a radius of curvature increasing from a peak down to inclined surfaces.

6. The switching mechanism of claim 5 , wherein the first curved portion is provided with an inflection portion having an inflection point on a part of each inclined surface.

7. The switching mechanism of claim 5 , wherein the contact pressure portion is further provided with a second curved portion formed at a predetermined distance from the first curved portion.

8. The switching mechanism of claim 7 , wherein the second curved portion has a lower height than the first curved portion.

Assignees

• Lsis Co Ltd

Inventors

• Lim Jeongjae
• Oh Kihwan

Classifications

• H01H71/52 Primary

  actuated by lever · CPC title

• H01H71/02

  Housings; Casings; Bases; Mountings · CPC title

• H01H71/10 Primary

  Operating or release mechanisms · CPC title

• H01H89/04

  Combination of a thermally actuated switch with a manually operated switch · CPC title

• H01H71/526 Primary

  the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure · CPC title