US5586922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Watercraft
Assignee: Yamaha Motor Co Ltd
•
Filing: 1995-02-27
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Granted: 1996-12-24
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Expires: 2015-02-27
Abstract
Abstract A small watercraft powered by twin jet propulsion units, each driven by a respective engine. The engine is concealed within a hatch cover that has a larger portion which is removable for removal of the engine and a smaller portion which is pivotal for servicing of the engine without removing the larger portion. A centrally positioned operator's seat has a seat back with a handle so as to facilitate mounting of a rear deck and facilitate a passenger standing on the rear deck during operation. There are disclosed a pair of driving engines positioned within a V-hull in a central location so as to improve stability and yet permit extreme maneuverability. A fuel tank supplies fuel to the engines and is separated from the engines by a bulkhead with both the fuel tank and the engines being accessible when the smaller hatch cover is opened. A waterlock is also provided in the tunnel between the jet propulsion units for receiving and discharging the exhaust gases from the engine while precluding water from entering the engines through their exhaust systems in the event the watercraft becomes inverted.
Inventors
- 👤 Noboru Kobayashi
- 👤 Tomoyoshi Koyanagi
- 👤 Keijiro Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:47
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/02; B63H11/10; B63H11/107; B63H11/11; B63B; B63B34/00; B63B34/10; B63H11/04; B63H11/08; B63H11/113; B63H2011/008
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
120 words
A small watercraft having a hull, a pair of engines disposed in side by side relationship in said hull, each of said engines having an exhaust pipe, a single waterlock disposed device comprised of a unitary outer housing within said hull along the longitudinal enter line of said watercraft and positioned at one end of said engines, said waterlock device having a pair of exhaust gas inlets each for receiving the exhaust gases a from a respective of said exhaust pipes and at least one discharge for discharging the exhaust gases to the atmosphere, said waterlock device unitary outer housing being provided within an internal trap for precluding the entry of water into said exhaust pipes from said waterlock device.
Claim 2
Dependent Claim
120 words
A small watercraft having a hull, a pair of engines disposed in side by side relationship in said hull, each of said engines having an exhaust pipe, a single waterlock disposed device comprised of a unitary outer housing within said hull along the longitudinal enter line of said watercraft and positioned at one end of said engines, said waterlock device having a pair of exhaust gas inlets each for receiving the exhaust gases a from a respective of said exhaust pipes and at least one discharge for discharging the exhaust gases to the atmosphere, said waterlock device unitary outer housing being provided within an internal trap for precluding the entry of water into said exhaust pipes from said waterlock device.
Claim 3
Dependent Claim
73 words
A small watercraft as set forth in claim 1 wherein the waterlock comprises means defining an internal cavity and wherein each exhaust pipes extends into the internal cavity and terminates above the lower end thereof and further including a pair of exhaust discharge pipes extending from the cavity to the atmosphere, said exhaust discharge pipes being formed as angled sections with the lower ends thereof terminating above the lower end of the chamber.
Claim 4
Dependent Claim
43 words
A small watercraft as set forth in claim 2 wherein the exhaust pipes have an L-shaped section extending into the chamber with a downwardly facing end and wherein the exhaust discharge pipes also have an L-shaped configuration with a downwardly extending discharge end.
Claim 5
Dependent Claim
34 words
A small watercraft as set forth in claim 3 wherein the hull is formed with a tunnel at the rear end thereof and the exhaust discharge pipes discharge the exhaust gases into the tunnel.
Claim 6
Dependent Claim
31 words
A small watercraft as set forth in claim 4 wherein the engines drive a pair of jet propulsion units positioned in the tunnel and disposed in surrounding relationship to the waterlock.
Claim 7
Dependent Claim
79 words
A small watercraft having a hull defining an internal volume, an internal combustion engine within said volume, a jet propulsion device having an outer housing positioned behind and driven by said engine for propelling said watercraft, a first bulkhead separating said engine from said jet propulsion device and said outer housing, a fuel tank positioned within said volume for supplying fuel to said engine, and a second bulkhead within said volume and separating said fuel tank from said engine.
Claim 8
Dependent Claim
79 words
A small watercraft having a hull defining an internal volume, an internal combustion engine within said volume, a jet propulsion device having an outer housing positioned behind and driven by said engine for propelling said watercraft, a first bulkhead separating said engine from said jet propulsion device and said outer housing, a fuel tank positioned within said volume for supplying fuel to said engine, and a second bulkhead within said volume and separating said fuel tank from said engine.
Claim 9
Dependent Claim
36 words
A small watercraft as set forth in claim 6 wherein there are a pair of internal combustion engines supplied with fuel from the fuel tank and each separated by the fuel tank by the second bulkhead.
Claim 10
Dependent Claim
34 words
A small watercraft was set forth in claim 7 wherein the propulsion device comprises a pair of jet propulsion units each driven by a respective one of the engines for propelling said small watercraft.
Claim 11
Dependent Claim
81 words
A small watercraft as set forth in claim 8 wherein each of the engines is provided with an exhaust pipe and further including a waterlock disposed within the hull along the longitudinal center line of the watercraft and between the jet propulsion units for receiving the exhaust gases from said exhaust pipes and discharging the exhaust gases to the atmosphere, said waterlock being provided with an internal trap for precluding the entry of water into said exhaust pipes from said waterlock.
Claim 12
Dependent Claim
46 words
A small watercraft as set forth in claim 9 wherein the hull is formed with a tunnel, the forward end of said tunnel being defined at least in part by the bulkhead and wherein the jet propulsion units and the waterlock are positioned within said tunnel.
Claim 13
Dependent Claim
84 words
A small watercraft having a hull defining an engine compartment, an internal combustion engine within said engine compartment, a removable two piece hatch assembly for enclosing said engine compartment comprised of a first smaller hatch portion openable separately from the other hatch portion and sized adequately to afford servicing of said engine but not removal of said engine, said second hatch portion being sufficiently larger so as to permit removal of said engine when both of said hatch portions are removed from said hull.
Claim 14
Dependent Claim
84 words
A small watercraft having a hull defining an engine compartment, an internal combustion engine within said engine compartment, a removable two piece hatch assembly for enclosing said engine compartment comprised of a first smaller hatch portion openable separately from the other hatch portion and sized adequately to afford servicing of said engine but not removal of said engine, said second hatch portion being sufficiently larger so as to permit removal of said engine when both of said hatch portions are removed from said hull.
Claim 15
Dependent Claim
22 words
A small watercraft as set forth in claim 11 wherein the first small hatch portion is pivotally connected to the second portion.
Claim 16
Dependent Claim
27 words
A small watercraft as set forth in claim 12 wherein the second hatch portion is completely removable from the hull along with the first smaller hatch portion.
Claim 17
Dependent Claim
23 words
A small watercraft as set forth in claim 13 wherein there are provided a pair of engines each covered by the hatch assembly.
Claim 18
Dependent Claim
30 words
A small watercraft as set forth in claim 14 further including a fuel tank for the engines disposed beneath the hatch cover but separated from the engines by a bulkhead.
Claim 19
Dependent Claim
19 words
A small watercraft as set forth in claim 15 wherein the fuel tank is disposed forwardly of the engines.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-24 | 2000-06-24 | 2000-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-24 | 2004-06-24 | 2004-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-24 | 2008-06-24 | 2008-12-24 | $7700.00 | Window Closed / Lapsed |