Gap adjusting method in trip mechanism of molded case circuit breaker

Patent metadata

Field	Value
Publication number	US-9646792-B2
Application number	US-201414468749-A
Country	US
Kind code	B2
Filing date	Aug 26, 2014
Priority date	Oct 17, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

Disclosed is a gap adjusting method which easily adjusts a gap between a bimetal and a crossbar by using a gap adjusting block and an adjusting screw in a trip mechanism of a molded case circuit breaker without a separate additional device. The gap adjusting method in the trip mechanism of the molded case circuit breaker includes setting a reference gap between a crossbar and a bimetal, measuring a total resistance of the trip mechanism and a trip stroke of a switching mechanism to set a compensation gap, placing a gap adjusting block on a position separated from a crossbar by a gap based on the sum of the reference gap and the compensation gap, rotating an adjusting screw assembled with the bimetal to contact the adjusting screw with the gap adjusting block, and adhering the adjusting screw to the bimetal.

First claim

What is claimed is:

1. A gap adjusting method in a trip mechanism of a molded case circuit breaker, the gap adjusting method comprising:
setting a reference gap between a crossbar and a bimetal;
measuring a total resistance of the trip mechanism and a trip stroke of a switching mechanism to set a compensation gap;
placing a gap adjusting block on a position separated from a crossbar by a gap based on a sum of the reference gap and the compensation gap;
rotating an adjusting screw assembled with the bimetal to contact the adjusting screw with the gap adjusting block; and
adhering the adjusting screw to the bimetal.

2. The gap adjusting method of claim 1 , wherein a contact surface of the gap adjusting block is planarly formed.

3. The gap adjusting method of claim 1 , wherein a contact surface of the gap adjusting block is vertical to a rotation axis of the adjusting screw.

4. The gap adjusting method of claim 1 , wherein a front end of the adjusting screw is formed of a round surface of a planar surface.

5. The gap adjusting method of claim 2 , wherein a rear end of the adjusting screw is formed of one of a straight-shaped groove, a cross-shaped groove, a straight-shaped projection, and a cross-shaped projection.

Assignees

• Lsis Co Ltd

Inventors

• Kim Woong Jae

Classifications

• H01H71/522

  comprising a cradle-mechanism · CPC title

• H01H69/01 Primary

  for calibrating or setting of devices to function under predetermined conditions · CPC title

• H01H71/16 Primary

  with bimetal element {(combined with detection of imbalance of two or more currents H01H83/223)} · CPC title

• Y10T29/49004

  including measuring or testing of device or component part · CPC title