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:
Jan. 17, 2012
Filed:
Nov. 28, 2008
Kazuo Yamaguchi, Takasago, JP;
Yasuaki Yamane, Takasago, JP;
Shigehiro Kasai, Takasago, JP;
Koichi Honke, Takasago, JP;
Kazuo Yamaguchi, Takasago, JP;
Yasuaki Yamane, Takasago, JP;
Shigehiro Kasai, Takasago, JP;
Koichi Honke, Takasago, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
In an extruder or a kneader, load (torque T) values on an input shaft portion of a screw shaft are detected by a load detector installed on the input shaft portion, then an overload condition is determined from a load mean value (T) and a load amplitude value (T) of the detected load values, and the issuance of an 'abnormal' alarm and/or the stop of rotation of the screw shaft are (is) performed when an overload duration time (t) of maintaining the overload condition exceeds a set time (t). In this way the screw shaft is protected from fatigue fracture caused by application thereto of such a load as does not exceed a designed mechanical strength but causes fatigue fracture.