The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 2007
Filed:
Aug. 01, 2003
Yasuhiko Maruhashi, Tokyo, JP;
Rikio Goto, Tokyo, JP;
Yasuhiko Maruhashi, Tokyo, JP;
Rikio Goto, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A solenoid type device as a magnetic switch of a startercomprises an exciting coilthat is energized and generates magnetic force, a plungerthat is a moving core which is a part of the magnetic circuit, and a fixed corethat faces the moving core and is also a part of the magnetic circuit. The moving core plungeris divided into concentrically the first plungerand the second plunger. This configuration allows the second plungerto be attracted first and then the first plungerto be attracted. Thereby, it is possible to make a small and light magnetic switch while ensuring that the magnetic switch maintains sufficient attraction force as well as to increase reliability of operations of the magnetic switch even when battery voltage is low.