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. 17, 2010
Filed:
Dec. 30, 2008
Shuji Ueki, Tokyo, JP;
Hirohumi Doi, Tamano, JP;
Shogo Miyajima, Tokyo, JP;
Kenzo Hasegawa, Yokohama, JP;
Hiroshi Satoh, Fujisawa, JP;
Shuji Ueki, Tokyo, JP;
Hirohumi Doi, Tamano, JP;
Shogo Miyajima, Tokyo, JP;
Kenzo Hasegawa, Yokohama, JP;
Hiroshi Satoh, Fujisawa, JP;
Mitsui Engineering & Shipbuilding Co., Ltd., Tokyo, JP;
Tsurumi Seiki Co., Ltd., Yokohama, JP;
Dai-Ichi Electric Co., Ltd., Fujisawa, JP;
Abstract
A hoisting device can be small-sized and energy can be saved. A hoisting deviceaccording to the present invention has a hoistand a control unit. The hoistrotates a drumhaving a wirewound thereon by an oil pressure motorrotatable in normal and reverse directions. To the oil pressure motor, operating oil is supplied from an oil pressure pump. The oil pressure pumpis a two-way discharge fixed capacity type, and rotated by a servomotor. An acceleration/displacement transducerin the control unitfinds a moving direction and a moving speed of a wire hanging point in the vertical direction from an output signal of an acceleration sensor. The control unitoutputs a drive control signal of the servomotoraccording to a paying-out speed or a rolling-up speed of the wireoffsetting the vertical motion of the wire hanging point caused by the heaving of a hull based on a speed instruction Vi of the paying-out or rolling-up speed of the wire, a detected signal of the acceleration sensorand a detected signal of a wire speed sensor