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. 15, 1981
Filed:
Oct. 23, 1979
Ikuo Tochizawa, Takaoka, JP;
Kabushiki Kaisha Fujikoshi, Toyama, JP;
Abstract
An AC solenoid apparatus of the armature-in-tube type for operating valves such as hydraulic/air valves, or other machines. The apparatus comprises a solenoid having a sealingly closed part including a pressure proof tube preferably made from a thin nonmagnetic material, and an exciting assembly having a coil encompassing the closed part and a yoke having a generally rectangular cross section. A slotted annular magnetic ring made from a magnetic material is inserted between the pressure proof tube and at least one part of the yoke. The solenoid of this invention is small in size and of low cost, and yet is endowed with a high force and a capability of restraining heat by being generated from the solenoid.