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:
Jun. 07, 2016
Filed:
Feb. 18, 2010
Hideki Arai, Chiba-Prefecture, JP;
Yasunobu Uchino, Narita, JP;
Hideki Arai, Chiba-Prefecture, JP;
Yasunobu Uchino, Narita, JP;
OTIS ELEVATOR COMPANY, Farmington, CT (US);
Abstract
A detector for an electromagnetic brake, for example used in an elevator system, that, by quantitative judgment, determines whether the brake force of the electromagnetic brake is appropriate. Load cells for detecting the recovery forces of brake springs are arranged between brake springs, which energize brake arms with brake shooes installed on them toward the side of brake wheel, and spring sheets, which hold brake springs in a compressive deformed state, and, at the same time, judgment part judges whether the brake force of electromagnetic brakeis outside a prescribed normal range based on the outputs of load cells. If the brake force of electromagnetic brake is outside the normal range, judgment part sends a signal, for example to a monitoring center.