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:
Sep. 18, 2001
Filed:
Apr. 18, 2000
Masanori Kaizuka, Ibaraki, JP;
Ryushiro Kaneko, Ibaraki, JP;
SMC Corporation, Tokyo, JP;
Abstract
To provide an electromagnetic actuator, having a large stroke and capable of producing the maximum thrust at a retreated stroke end, which is simple in structure and easy to manufacture. The electromagnetic actuator comprises an electromagnetic coil,, a magnetic frame,arranged on the periphery thereof, a movable iron core,slidable in a central hole,of the coil,, a first sleeve,coupled with the magnetic frame,at one end side of the central hole,of the coil, and a second sleeve,coupled with the magnetic frame,at the other end side of the central hole,. The second sleeve,is spaced from the first sleeve,with a space (A+C) in the axial direction, and has an end thereof opposing the first sleeve,extended to a position in close proximity to the movable iron core,when the movable iron core,is at the retreated stroke end, but without being substantially fitted thereon, and extended to a position apart therefrom by a micro-distance A.