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:
Nov. 23, 2004
Filed:
Mar. 20, 2002
Seiichi Kishi, Kobe, JP;
Tsukasa Yoshida, Kobe, JP;
Nobuyasu Takahashi, Kobe, JP;
Kenji Ito, Kobe, JP;
Kenichi Sonoda, Kobe, JP;
Other;
Abstract
A helm pump ( ) rotated either in forward or reverse direction by operating a steering wheel ( ) and discharges a liquid of a quantity proportional to the rotating angle, and a double action cylinder moves a rudder ( ) and is provided on rudder ( ) side of the ship, helm pump ( ) and the double action cylinder being connected with the hydraulic circuit of fully closed construction, to move the rudder ( ) by an amount corresponding to the amount of liquid discharged from the helm pump ( ). A second pump generates discharging pressure in the same direction as the discharging direction from helm pump ( ) against resistive pressure generated by the rotation of helm pump ( ) due to the operation of steering wheel ( ) is installed in series in part of the fully closed hydraulic circuit, so the steering resistance of steering wheel ( ) is automatically reduced by the action of the second pump.