Controlled thrust steering system for watercraft

Details Controlled thrust steering system for watercraft Controlled thrust steering system for watercraft

1999-11-23

2001-05-15

Sotelo, Jesus D. (Department: 3617)

Marine propulsion

Jet drive

Direction control for fluid jet

C440S001000

Reexamination Certificate

active

06231410

ABSTRACT:

THE FIELD OF THE INVENTION
The present invention relates to a controlled thrust steering system for a watercraft, and more particularly to a controlled thrust steering system for a watercraft of the jet propulsion type.
One type of watercraft is the jet propelled type that is designed to be operated by a rider that is seated on the watercraft in a straddle-like fashion. This type of watercraft is propelled by discharging water out of a discharge nozzle located at the rear of the watercraft.
To provide steering for the watercraft, a steering nozzle is pivotably connected to the end of the discharge nozzle. The input for the pivot of the steering nozzle is provided by a steering handle pivotably mounted on the top of the watercraft. To steer the watercraft to the right, the rider turns the steering handle clockwise causing the steering nozzle to pivot counter-clockwise. The discharge of water out of the steering nozzle with the nozzle pivoted counter-clockwise causes the watercraft to yaw clockwise and turn to the right. A similar but opposite sequence is used to steer the watercraft to the left. Therefore, for a watercraft of the jet propulsion type to steer properly, a sufficient amount of thrust out of the steering nozzle is required.
The thrust of the watercraft is controlled by the rider through the use of a finger operated throttle lever pivotably mounted on the steering handle. The throttle lever is biased toward an idle position. To increase thrust of water out of the discharge nozzle, the rider presses down on the throttle lever with his finger. This pivots the throttle lever toward the wide open throttle position. To decrease thrust of water out of the discharge nozzle, the rider releases the throttle lever. Since the throttle lever is biased toward the idle position, without a force countering the bias, the throttle lever pivots toward the idle position. As the throttle lever pivots toward the idle position, the thrust of the water out of the discharge decreases.
While the decrease in thrust of water out of the discharge nozzle is desirable for slowing down the watercraft, the decrease in thrust of the water out of the discharge nozzle also decreases the steering capability of the watercraft since the thrust provides the steering for the watercraft.
This quick decrease in steering capability is particularly problematic in situations in which an inexperienced rider attempts to avoid an obstacle directly in front of the watercraft. To properly avoid the obstacle, the rider should apply a constant pressure on the throttle lever while simultaneously turning the steering handle. However, an inexperienced rider may release the throttle lever to slow the watercraft quickly while simultaneously turning the steering handle in an attempt to maneuver around the obstacle. In such a situation, the rider may not be able to maneuver around the obstacle since steering capability has been decreased.
This decrease in steering capability is also problematic for the rider to maneuver the watercraft for docking the watercraft. Since the docking procedure usually occurs with the watercraft traveling at a low speed, the rider may release the throttle lever while attempting to dock the watercraft. However, with only idle thrust provided to steer the watercraft, steering capability may not be adequate to dock the watercraft.
SUMMARY OF THE INVENTION
The present invention is directed toward a throttle system for a watercraft of the jet propulsion type comprising a steering mechanism, a throttle control mechanism, a thrust mechanism, a throttle regulator and a controlled thrust steering system. The steering mechanism has a straight-ahead position. The steering mechanism is able to rotate in a clockwise direction from the straight-ahead position to a clockwise position and in a counter-clockwise direction from the straight-ahead position to a counter-clockwise position. The throttle control mechanism is biased toward an idle position. The thrust mechanism provides jet propulsion thrust for the watercraft. The throttle regulator regulates thrust provided by the thrust mechanism. The controlled thrust steering system causes the throttle regulator to increase thrust upon the steering mechanism rotating from the straight-ahead position to the clockwise position or the counter-clockwise position. The controlled thrust steering system also causes the throttle regulator to decrease thrust upon the steering mechanism rotating from the clockwise position or the counter-clockwise position to the straight-ahead position.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a perspective view of a watercraft in accordance to the present invention;
FIG. 2
is an enlarge view of a thrust control mechanism of
FIG. 1
;
FIG. 3
is an enlarged view of the right steering handle showing a first embodiment of a controlled thrust steering system;
FIG. 4
is an enlarged view of the right steering handle showing a second embodiment of a steering system;
FIG. 5
is an enlarged view of the right steering handle showing a third embodiment of a controlled steering system;
FIG. 6
is a diagram showing the effect of the controlled thrust steering systems in accordance to the and third embodiments;
FIG. 7
is a perspective view of a watercraft showing a fourth embodiment of a controlled thrust steering system;
FIG. 8
is an enlarged view of the right steering handle showing a throttle closed switch;
FIG.
9
. is an enlarged view of the thrust control mechanism with an off-throttle control cable connected e throttle cable;
FIG. 10
is a circuit diagram of the fourth embodiment;
FIG. 11
is a diagram showing the effect of the controlled thrust steering system in accordance to the fourth embodiment;
FIG. 12
is a perspective view of a watercraft showing a fifth embodiment of a controlled thrust system;
FIG. 13
is a top plan view of the steering post and proximity switch of
FIG. 12
;
FIG. 14
is circuit diagram of the fifth embodiment;
FIG. 15
is a diagram showing the effect of the controlled thrust steering system in accordance to the fifth embodiment should the rider turn the steering handle a sufficient amount prior to releasing the throttle lever;
FIG. 16
is a diagram showing the effect of the controlled thrust steering system in accordance to the fifth embodiment should the rider release the throttle lever prior to turning the steering handle a sufficient amount and the thrust dropped below the steerable thrust;
FIG. 17
is a diagram showing the effect of the controlled thrust steering system in accordance to the fifth embodiment should the rider release the throttle lever for a long period of time, such that the thrust out of the steering nozzle is at idle thrust, and thereafter turn the steering handle a sufficient amount;
FIG. 18
is a top plan view of a steering post with a lever arm showing a sixth embodiment of a controlled thrust steering system;
FIG. 19
is a diagram showing the effect of the controlled thrust steering system in accordance to the sixth embodiment;
FIG. 20
is a top plan view of a steering post with an axial slot in a lever arm showing a seventh embodiment of a controlled thrust steering system;
FIG. 21
is a top plan view of a steering post with a circumferential slot in a lever arm showing a seventh embodiment of a controlled thrust steering system;
FIG. 22
is a digram showing the effect of the controlled thrust steering system in accordance to the seventh embodiment;
FIG. 23
is a schematic of the mechanical connection between a steering post, a throttle lever and a throttle control pulley showing an eighth embodiment of a controlled thrust steering system;
FIG. 24
is a diagram showing the effect of the controlled thrust steering system in accordance to the eight embodiment;
FIG. 25
is a top plan view of a steering post with a cam showing a ninth embodiment of a controlled steering system;
FIG. 26
is a diagram showing the effect of the controlled thrust steering system in accordance to the ninth embodiment;
FIG. 27
is a perspective view of a throttle regulator of a tenth embodiment of a controll

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