Trip device for circuit breaker

Patent metadata

Field	Value
Publication number	US-10290446-B2
Application number	US-201414491567-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Oct 17, 2013
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A trip device for a circuit breaker includes: a crossbar rotatably installed to perform the trigger function; and bimetal that is curved upon the occurrence of an abnormal current and presses and rotates the crossbar by means of a gap adjustment member. The crossbar is movable in the direction of a rotating shaft of the crossbar, and the gap adjustment member is attached to and detached from either the crossbar or the bimetal at varying angles so that a contact surface is parallel or at an angle to the direction of movement of the crossbar.

First claim

What is claimed is:

1. A trip device for a circuit breaker, the trip device comprising:
a crossbar that performs a trigger function and that moves in a direction of movement of a rotating shaft of the crossbar; and
a bimetal that curves upon occurrence of an abnormal current and presses and rotates the crossbar via a gap adjustment member,
wherein the crossbar comprises:
a pipe-like body portion; and
a contact portion extending from the body portion;

wherein the contact portion comprises:
a cylindrical contact protrusion protruding in the direction of the tangent to a circular trajectory around the rotating shaft; and
a crossbar contact surface formed at right angles to the length of the cylindrical contact protrusion at the end of the contact portion;

wherein the gap adjustment member comprises:
a coupling part that attaches to and detaches from the bimetal; and
a gap adjustment part that is formed on an upper part of the coupling part, the gap adjustment part adjusting the gap between the bimetal and the crossbar;

wherein the gap adjustment part comprises:
a flat first side that is parallel to the crossbar contact surface; and
a sloped second side that is formed on a back of the flat first side, the sloped second side being inclined in a horizontal direction to the crossbar contact surface; and

wherein a rectangular shaped recess is formed on a bottom side of the coupling part to receive an end of the bimetal.

2. The trip device of claim 1 , wherein length and depth directions of the recess are parallel to the first side.

Assignees

• Lsis Co Ltd

Inventors

• Oh Ki Hwan

Classifications

• H01H71/7436

  Adjusting the position (or prestrain) of the bimetal (H01H71/7445 takes precedence) · CPC title

• H01H37/52 Primary

  actuated due to deflection of bimetallic element · CPC title

• H01H37/22

  by adjustment of a member transmitting motion from the thermal element to contacts or latch · CPC title

• H01H37/30

  by varying the position of the contact unit in relation to switch base or casing · CPC title

• H01H71/7409 Primary

  Interchangeable elements · CPC title