Magnetic switch

Patent metadata

Field	Value
Publication number	US-9754749-B2
Application number	US-201514749378-A
Country	US
Kind code	B2
Filing date	Jun 24, 2015
Priority date	Jul 11, 2014
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A magnetic switch includes: a housing; a cylinder coupled to an inner side of the housing; a stationary contact arm coupled to the housing; a movable contact arm positioned to be movable within the housing and brought into contact with the stationary contact arm or separated therefrom; a coil assembly installed within the housing and configured to form a magnetic field when a current is applied thereto; a movable shaft coupled to the movable contact arm in an upper portion thereof; a fixed core inserted into the cylinder and surrounding the movable shaft; and movable cores fixed to the movable shaft and configured to press the movable shaft by a magnetic field formed by the coil assembly to move the movable shaft.

First claim

What is claimed is:

1. A magnetic switch comprising:
a housing;
a cylinder coupled to an inner side of the housing;
a stationary contact arm coupled to the housing;
a movable contact arm positioned to be movable within the housing and brought into contact with the stationary contact arm or separated therefrom;
a coil assembly installed within the housing and configured to form a magnetic field when a current is applied thereto;
a movable shaft coupled to the movable contact arm in an upper portion thereof;
a fixed core inserted into the cylinder and surrounding the movable shaft; and
movable cores fixed to the movable shaft and configured to press the movable shaft by a magnetic field formed by the coil assembly to move the movable shaft,
wherein the movable cores include a protrusion portion extending toward the movable shaft and fixed to the movable shaft and a body portion configured to move in contact with an inner diameter of the cylinder, and the fixed core has an accommodation portion for accommodating the protrusion portion,
wherein the protrusion portion and the body portion are provided as separate members,
wherein the protrusion portion presses a lower end of the movable shaft when the body portion and the protrusion portion move together, and as the movable shaft is pressed by the protrusion portion, the movable shaft is guided by the fixed core so as to be moved, and
wherein the protrusion portion is separated from the body portion such that the separated protrusion portion further presses the movable shaft.

2. The magnetic switch of claim 1 , wherein an outer surface of the protrusion portion is in contact with an inner surface of the accommodation portion and guided to be moved.

3. The magnetic switch of claim 1 , wherein a depth of the accommodation portion is greater than a height of the protrusion portion such that the protrusion portion is accommodated within the accommodation portion.

4. The magnetic switch of claim 1 , wherein the body portion separated from the protrusion portion does not move when the separated protrusion portion moves alone to press the movable shaft.

5. The magnetic switch of claim 4 , wherein a moving distance of the protrusion portion is greater than a moving distance of the body portion when the movable shaft is pressed.

6. The magnetic switch of claim 1 , wherein the separated protrusion portion moves further to press the movable shaft while the body portion contacts the fixed core and cannot move further.

Assignees

• Lsis Co Ltd

Inventors

• Son Sol San

Classifications

• H01H50/20 Primary

  movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil · CPC title

• H01H50/54

  Contact arrangements · CPC title

• H01H50/04

  Mounting complete relay or separate parts of relay on a base or inside a case · CPC title

• H01H50/645

  intermediate part making a resilient or flexible connection (H01H50/66 - H01H50/74 take precedence) · CPC title

• H01H50/56 Primary

  Contact spring sets · CPC title