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:
Feb. 06, 2001
Filed:
Jun. 09, 1999
Eiichi Ishigaki, Kagawa-ken, JP;
Ishigaki Company Limited, Tokyo, JP;
Abstract
A blockage preventing apparatus used for a water jet propulsion unit (,) is provided with a screen (,), springs (,), an engagement protrusion (,) and an engagement end portion (,). The screen (,) is rotatably supported with respect to the front end of a suction port (,) and movable between a closed position at which the screen covers the suction port (,) and an open position shifted downward from the suction port (,). The springs (,) urge the screen (,) to the closed position through a working shaft (,). The engagement protrusion (,) is provided at the working shaft (,) and moves together with the screen (,). The engagement end portion (,) moves from the first position and moves beyond the second position. When the engagement end portion (,) moves from the first position to the second position, the engagement end portion (,) is engaged with and presses the engagement protrusion (,) to thereby move the screen (,) from the closed position to the open position. When the engagement end portion (,) moves beyond the second position, the engagement protrusion (,) is disengaged from the engagement end portion (,) and the screen (,) is momentarily returned from the open position to the closed position by the springs (,).