Jet boat reversing unit
OwnerLloyd E. Keeneyinventor
Life of this patent
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Abstract
The invention pertains to reversing apparatus for hydraulic jet marine drives utilizing a pivoted steering nozzle and a reversing gate adapted to divert a jet of water into a reversing nozzle. The reversing nozzle is rotatably mounted upon the steering nozzle and utilizes orientation apparatus fixed with respect to the axis of the steering nozzle such that rotation of the steering nozzle in one direction produces rotation of the reversing nozzle about its axis in the opposite direction. The relative movements of the steering and reversing nozzles produces force vectors in the nozzles in a common lateral direction with respect to boat movement wherein a high degree of boat control while being reversed is achieved at low pumping capacity.
Claims7
Reversing apparatus for a hydraulic jet marine drive having a steering nozzle pivotal about a substantially vertical axis adapted to discharge water along a flow axis through an outlet, a reversing nozzle inlet opening communicating with said steering nozzle and a reversing gate movably mounted upon the steering nozzle adapted to be selectively positioned within said outlet to direct water into said reversing nozzle inlet opening, a reversing nozzle mounted on the steering nozzle having an inlet communicating with the reversing nozzle inlet opening and an outlet having an axis of discharge, bearing means rotatably mounting said reversing nozzle on the steering nozzle about a pivot axis radially spaced from the steering nozzle axis whereby said discharge axis may be obliquely related to the flow axis of the steering nozzle, the improvement comprising reversing nozzle orienting means connected to said reversing nozzle and fixed with respect to the steering nozzle axis whereby pivoting of the steering nozzle about its axis pivots said reversing nozzle about its axis in the opposite direction to obliquely orient said discharge axis relative to the steering nozzle flow axis at a variable angle directly related to the extent of pivoting of the steering nozzle about its pivot axis whereby the turning reaction forces within the steering nozzle and reversing nozzle are complementary.
Reversing apparatus for a hydraulic jet marine drive comprising, in combination, a tubular steering nozzle adapter having a first flow axis, a steering nozzle pivotally mounted on said adapter upon a substantially vertical pivot axis having a second flow axis, an inlet end communicating with said adapter and an outlet end, means for pivoting said steering nozzle, a reversing gate movably mounted on said steering nozzle adapted to selectively close said nozzle outlet end, a reversing nozzle inlet opening defined in said nozzle intermediate said ends thereof, a reversing nozzle rotatably mounted on said steering nozzle about an axis and communicating with said opening and having a third flow axis, and reversing nozzle orienting means interconnecting said reversing nozzle and a point fixed relative to said adapter pivoting said reversing nozzle about its pivot axis, upon pivoting of said steering nozzle about its pivot axis, in a direction such that the force vectors transverse to said first flow axis of said second and third flow axes due to fluid flow through said steering and reversing nozzles are in a common direction.
Dependencies are inferred from the claim text.