Contact switching device

Patent metadata

Field	Value
Publication number	US-9240288-B2
Application number	US-201113582996-A
Country	US
Kind code	B2
Filing date	Mar 14, 2011
Priority date	Mar 15, 2010
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

An object of the present invention is to provide a contact switching device that has small hitting sound during operation and is excellent in impact resistance. For this, there is a contact switching device in which a movable iron core ( 142 ) provided at one end portion of a movable shaft is attracted to a fixed iron core, based on excitation and degauss of an electromagnet portion, by which the movable shaft reciprocates in a shaft center direction, and a movable contact of a movable contact piece arranged at another end portion of the movable shaft contacts and departs from a fixed contact. Particularly, the movable iron core ( 142 ) has a cylindrical outer circumferential portion ( 142 a ) and an annular attracting and sticking portion ( 142 b ), and a ratio between an inner diameter and an outer diameter of the cylindrical outer circumferential portion ( 142 a ) is 77% or less.

First claim

We claim:

1. A contact switching device in which a movable iron core provided at one end portion of a movable shaft is attracted to a fixed iron core, based on excitation and degauss of an electromagnet portion, by which the movable shaft reciprocates in a shaft center direction, and a movable contact of a movable contact piece arranged at another end portion of the movable shaft contacts and departs from a fixed contact,
wherein the movable iron core has a cylindrical outer circumferential portion, a cylindrical inner circumferential portion and an annular attracting and sticking portion disposed between a top of said movable iron core and a top of said cylindrical inner circumferential portion, and a ratio between an inner diameter and an outer diameter of the cylindrical outer circumferential portion is 77% or less and 65% or more.

2. The contact switching device according to claim 1 , wherein a ratio of a height dimension of the annular attracting and sticking portion to a height dimension of the cylindrical outer circumferential portion is at least 20%.

3. The contact switching device according to claim 1 wherein the cylindrical inner circumferential portion is provided inward at an opening edge portion of the annular attracting and sticking portion.

4. The contact switching device according to claim 2 wherein the cylindrical inner circumferential portion is provided inward at an opening edge portion of the annular attracting and sticking portion.

Assignees

• Yano Keisuke
• Hashimoto Ryuichi
• Hayashida Yasuo
• Mori Shingo
• Omron Tateisi Electronics Co

Inventors

• Yano Keisuke
• Hashimoto Ryuichi
• Hayashida Yasuo
• Mori Shingo

Classifications

• H01H51/06

  Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity · CPC title

• H01H50/546

  for contactors having bridging contacts · CPC title

• H01H2050/025

  containing inert or dielectric gasses, e.g. SF6, for arc prevention or arc extinction · CPC title

• H01H50/40

  Branched or multiple-limb main magnetic circuits · CPC title

• H01H50/02 Primary

  Bases; Casings; Covers (frames for mounting two or more relays or for mounting a relay and another electric component H02B1/01, H04Q1/08, H05K) · CPC title