US 6,183,319 B2 · Closure preventive device for water jet propulsion type outboard motor

Abstract

A blockage preventing apparatus used for a water jet propulsion unit (2) is provided with a screen (6), springs (22), an engagement protrusion (21) and an engagement end portion (20a). The screen (6) is rotatably supported with respect to the front end of a suction port (7) and movable between a closed position at which the screen covers the suction port (7) and an open position shifted downward from the suction port (7). The springs (22) urge the screen (6) to the closed position through a working shaft (17). The engagement protrusion (21) is provided at the working shaft (17) and moves together with the screen (6). The engagement end portion (20a) moves from the first position and moves beyond the second position. When the engagement end portion (20a) moves from the first position to the second position, the engagement end portion (20a) is engaged with and presses the engagement protrusion (21) to thereby move the screen (6) from the closed position to the open position. When the engagement end portion (20a) moves beyond the second position, the engagement protrusion (21) is disengaged from the engagement end portion (20a) and the screen (6) is momentarily returned from the open position to the closed position by the springs (22).

Claims14

Dependent claims

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;
and
a second engagement portion moving from a first position beyond a second position, wherein
when 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, and
when 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.

4 more elements

A water jet propulsion unit comprising:

a casing member including a lower opening at a front end, a lateral opening at a rear end and an internal space between said lower opening and said lateral opening;
a vane arranged within said internal space and rotated for drawing water from said lower opening to inject the water from said lateral opening;
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;
and
a second engagement portion moving from a first position beyond a second position, wherein
when 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, and
when said second engagement portion moves beyond said second position, said first engagement position is disengaged from said second engagement portion and said screen is returned from said open position to said closed position by said urging member.

6 more elements

Dependencies are inferred from the claim text.

Closure preventive device for water jet propulsion type outboard motor

Life of this patent

Closure preventive device for water jet propulsion type outboard motor

Life of this patent

Abstract

Claims14