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. 15, 1995
Filed:
Mar. 18, 1994
Yoshio Asou, Yawara, JP;
Hideharu Sato, Yawara, JP;
Keisuke Shimauchi, Yawara, JP;
Takumi Matsumoto, Yawara, JP;
SMC Corporation, Tokyo, JP;
Abstract
In order to prevent wearing caused by collision when a movable iron core is drawn to a fixed iron core and also to prevent wearing caused by contact when the movable iron core slides in an iron core hole of an electromagnetic valve, a cap mounted on a forward end of the movable iron core and made of an elastic material is provided with a guide tube unit to be engaged in an iron core hole and with a flange unit located on outer side of the iron core hole. Outer diameter of the guide tube unit is designed slightly larger than outer diameter of the movable iron core, and it is slidably engaged in the iron core hole. Distance between the flange unit and outer wall of the iron core hole is designed slightly shorter than distance between the movable iron core and the fixed iron core so that, when power is turned on, the flange unit is brought into contact with outer wall of the iron core hole before the movable iron core collides against the fixed iron core.