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:
Aug. 05, 1980
Filed:
Aug. 02, 1978
Applicant:
Inventors:
Yoshio Ohtani, Matsuyama, JP;
Todomu Kakishima, Fukuoka, JP;
Assignee:
Diesel Kiki Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
335262 ; 335236 ; 335255 ;
Abstract
The present invention is a plunger-type electro-magnetic actuator which produces a constant attracting force regardless of the position of the plunger. A tip portion of the plunger is tapered and a magnetic pole piece of the solenoid adapted to electro-magnetically attract the tip portion is provided with a tapered hole having a diameter larger than the outer diameter of the plunger. An additional magnetic pole piece is substantially displaced from the magnetic pole piece along the advancing direction of the plunger so as to increase the operational range of the plunger.