Patent ID: 6183319
Filing Date: 2001-02-06
Classification: B63H,F02B

Abstract:
A blockage preventing apparatus for a water jet propulsion unit with a lower opening comprising:a screen rotatably supported with respect to a front end of said lower opening and moving between a closed position at which the screen covers said lower opening and an open position shifted downward from said lower opening;an urging member urging said screen to said closed position;a first engagement portion moving together with said screen; anda second engagement portion moving from a first position beyond a second position, whereinwhen said second engagement portion moves from said first position to said second position, said second engagement portion is engaged with and presses said first engagement portion to move said screen from said closed position to said open position, andwhen said second engagement portion moves beyond said second position, said first engagement portion is disengaged from said second engagement portion and said screen is returned from said open position to said closed position by said urging member.