# US 5,350,325 A · Water injection propulsion device

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- Number: US 5,350,325 A
- Document ID: US5350325A
- Status: Granted
- Kind: A
- Application number: 08/069,977
- Filed: 1993-05-28
- Granted: 1994-09-27
- Earliest claimed: 1992-06-17
- Assignees: Sanshin Kogyo Kabushiki Kaisha
- Inventors: Masayoshi Nanami
- Web page: https://patentgrep.com/patent/US5350325A

## CPC

- B63H 11/113: Pivoted outlet
- B63H 11/11: with bucket or clamshell-type reversing means
- B63H: MARINE PROPULSION OR STEERING (propulsion of air-cushion vehicles B60V1/14; specially adapted for submarines, other than nuclear propulsion, B63G; specially adapted for torpedoes F42B19/00)

## Abstract

A jet propelled watercraft having a reverse thrust mechanism including a reverse thrust bucket. The hull is provided with a portion that underlies the discharge nozzle of the jet propulsion unit and which provides a continuous surface for the hull when the reverse thrust bucket is in the forward drive mode. However, when the reverse thrust bucket is moved to the reverse thrust position, a closure panel opens to provide an opening through which water may be discharged during reverse thrust operation.

## Claims

### Claim 1

A watercraft having a hull and a jet propulsion unit supported by said hull for propelling said watercraft, said jet propulsion unit having a discharge nozzle, a reverse thrust bucket supported for movement relative to said discharge nozzle between a forward drive position and a reverse drive position wherein the water from the discharge nozzle is diverted in a forward direction so as to provide a reverse driving thrust, said hull having a portion underlying said discharge nozzle, and a movable closure plate carried directly by said underlying portion and moveable between a closed position to provide an extension of the hull that extends under said discharge nozzle and an open position to provide an opening through which the water diverted by said reverse thrust bucket may pass when operating in the reverse thrust mode.

### Claim 2 (depends on 1)

A watercraft as set forth in claim 1 wherein the hull is provided with a tunnel at the rear end thereof and the jet propulsion unit is supported within the tunnel.

### Claim 3 (depends on 2)

A watercraft as set forth in claim 2 wherein the hull portion is formed at least in part by a closure plate underlying the tunnel and extending beneath the discharge nozzle.

### Claim 4 (depends on 3)

A watercraft as set forth in claim 3 wherein the reverse thrust bucket and the hull closure are operated simultaneously by a common actuator.

### Claim 5 (depends on 4)

A watercraft as set forth in claim 4 wherein the closure and reverse thrust bucket are each operated by a respective wire actuator.

### Claim 6 (depends on 5)

A watercraft as set forth in claim 5 wherein the closure is formed by a pivotally supported member pivotally supported at the forward end of the opening in the underlying hull portion.

### Claim 7 (depends on 1)

A watercraft as set forth in claim 1 wherein the reverse thrust bucket and the hull closure are operated simultaneously by a common actuator.

### Claim 8 (depends on 7)

A watercraft as set forth in claim 7 wherein the closure and reverse thrust bucket are each operated by a respective wire actuator.

### Claim 9 (depends on 7)

A watercraft as set forth in claim 7 wherein the closure is formed by a pivotally supported member pivotally supported at the forward end of the opening in the underlying hull portion.

### Claim 10 (depends on 9)

A watercraft as set forth in claim 9 wherein the closure and reverse thrust bucket are each operated by a respective wire actuator.

### Claim 11 (depends on 1)

A watercraft as set forth in claim 1, wherein the hull underlying portion defines an opening opened and closed by the moveable closure plate, said opening being defined by a pair of side portions extending along the sides of said opening, said moveable closure plate being flush with said side portions when in its closed position.

### Claim 12 (depends on 11)

A watercraft as set forth in claim 11, wherein the closure is formed by a pivotally supported member pivotally supported at the forward end of the opening in the underlying hull portion.

### Claim 13 (depends on 11)

A watercraft as set forth in claim 11, wherein the reverse thrust bucket and the hull closure are operated simultaneously by a common actuator.