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:
Feb. 01, 2000
Filed:
Oct. 08, 1997
Masahiro Soh, Anjo, JP;
Denso Corporation, Kariya, JP;
Abstract
In an electromagnetic switch for a starter, a plunger is housed to face a grounding plate through an air gap in the inner circumference of an attraction coil. When the attraction coil is energized and magnetic flux flows in the magnetic circuit, the plunger is attracted toward the grounding plate by the magnetic force. The plunger has a hollow recess as a variable magnetic resistance member at its bottom end which is opposite to the air gap. The hollow recess extends inwardly from the bottom surface of the plunger by a predetermined length and is closed by a plug body fitted in the opening to have a closed hollow space. The variable magnetic resistance member may be provided by a reduced diameter part in place of or in combination with the hollow recess.