Magnetic switch

Patent metadata

Field	Value
Publication number	US-9679725-B2
Application number	US-201514985182-A
Country	US
Kind code	B2
Filing date	Dec 30, 2015
Priority date	Apr 23, 2015
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

The present invention relates to a magnetic switch, and more particularly, a magnetic switch capable of preventing degradation of breaking efficiency by utilizing magnetic force to the utmost, in a manner of matching contact centers of fixed and movable cores. A magnetic switch according to one embodiment includes a bobbin provided with a cylindrical body and a plurality of flanges and having a coil wound on an outer circumferential surface thereof, a fixed core fixed to an inside of the cylindrical body with a predetermined spaced interval from the cylindrical body, and a movable core slidably installed in the cylindrical body and contactable with or separated from the fixed core, wherein a guide portion protrudes from a lower portion of the cylindrical body along an inner circumferential surface of the cylindrical body, such that the movable core can linearly move along a central axis of the fixed core.

First claim

What is claimed is:

1. A magnetic switch comprising:
a bobbin having a cylindrical body and a plurality of flanges with a coil wound on an outer circumferential surface of the cylindrical body;
a fixed core fixed to an inner side of the cylindrical body;
a movable core slidably installed in the cylindrical body such that it contacts or separates from the fixed core; and
a guide portion that protrudes from a lower portion of the cylindrical body along an inner circumferential surface of the cylindrical body,
wherein the fixed core is spaced apart from the cylindrical body by a predetermined distance,
wherein the movable core is linearly moved along a central axis of the fixed core,
wherein a length of the guide portion is shorter than a length of the movable core such that a portion of the movable core is spaced apart from the cylindrical body, and
wherein the inner surface of the guide portion entirely contacts the movable core in a closed or open state of the magnetic switch.

2. The magnetic switch of claim 1 , wherein an outer circumferential surface of the movable core is uniform without a step or inclination along a lengthwise direction of the movable core.

3. The magnetic switch of claim 1 , wherein an inner diameter of the guide portion is smaller than an outer diameter of the fixed core.

4. The magnetic switch of claim 1 , wherein an upper end of the guide portion and an upper end of the movable core are located at a same position in the open state.

Assignees

• Lsis Co Ltd

Inventors

• Park Jinhee

Classifications

• H01H51/065

  Relays having a pair of normally open contacts rigidly fixed to a magnetic core movable along the axis of a solenoid, e.g. relays for starting automobiles (details H01H50/20) · CPC title

• H01H2205/002

  fixed to operating part · CPC title

• H01H50/18

  Movable parts of magnetic circuits, e.g. armature · CPC title

• H01H50/36

  Stationary parts of magnetic circuit, e.g. yoke · CPC title

• H01H33/74 Primary

  wherein the break is in gas (in air at atmospheric pressure H01H33/73) · CPC title