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:
May. 03, 2011
Filed:
Mar. 22, 2005
Toshie Takeuchi, Chiyoda-ku, JP;
Akihiko Maruyama, Chiyoda-ku, JP;
Mitsuru Tsukima, Chiyoda-ku, JP;
Toshihiro Matsunaga, Chiyoda-ku, JP;
Katsuhiko Horinouchi, Chiyoda-ku, JP;
Toshie Takeuchi, Chiyoda-ku, JP;
Akihiko Maruyama, Chiyoda-ku, JP;
Mitsuru Tsukima, Chiyoda-ku, JP;
Toshihiro Matsunaga, Chiyoda-ku, JP;
Katsuhiko Horinouchi, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A state grasp device that needs no optical adjustment, and can be downsized. An exciting current waveform of an opening electromagnetic coil of an electromagnetic operating set functioning to drive a moving contact of a switching device includes an inflection point appearing subsequently to a maximum value, the inflection point taking place at the time of the contact being parted. Accordingly, a wear amount of contact from the change over time can be obtained. A position of the inflection point is obtained, for example, by focusing the rate of change in current; and a wear amount of a switching contact is obtained from the change over time of a time when the inflection point takes place. With the device, the use of a mechanical detection device, such as an optical detector, can be eliminated.