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:
Nov. 24, 1981
Filed:
Oct. 23, 1979
Kazuo Araki, Tateyama, JP;
Kabushiki Kaisha Fujikoshi, Toyama, JP;
Abstract
An improved solenoid apparatus for operating valves such as hydraulic/air valves or other mechanical devices including a pressure proof tube which is wholly or partially nonmagnetic and has one end connected sealingly to a stationary core, an armature slidably mounted in contact with the inner face of the pressure proof tube, and a coil assembly comprising substantially a yoke and a coil encompassing the pressure proof tube. A cylindrical magnetic ring enclosing a part of the stationary core and a part of the pressure proof tube in the vicinity of the end face at the attracting side of the stationary core is inserted between the stationary core and the coil assembly the one end of the magnetic ring protruding axially over to the armature side, whereby the solenoid can be used either with alternating or direct current merely by replacing the coil assembly. When the solenoid is connected to an AC power source, there is no need to install a shading coil and therefore, the apparatus is low in cost and reliably endures impact loads.