Patent US3556041A successfully refreshed from Google Patents.
US3556041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust system for marine propulsion device
Assignee: Outboard Marine Corp
•
Filing: 1969-01-21
•
Granted: 1971-01-19
•
Expires: 1989-01-21
Abstract
Abstract Disclosed herein is a marine propulsion lower unit which is arranged to afford exhaust gas discharge during forward drive through a discharge outlet at the rear of a propeller hub, and when operating under conditions other than in forward drive, to provide underwater exhaust gas discharge upstream from the exhaust gas discharge outlet at the rear of the propeller.
Inventors
- 👤 William J Shimanckas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:49
CPC Classifications
B; B63; B63H; B63H23/00; B63H23/30; B63H20/00; B63H20/14; B63H20/20; B63H20/24; B63H20/26; B63H20/32; B63H2020/323
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
156 words
A marine propulsion device comprising a lower unit including a vertically extending drive shaft having a driving pinion, an axially shiftable, rotatably mounted propeller shaft, a pair of gears meshed with said pinion and rotatably mounted in spaced relation to each other coaxially with said propeller shaft, dog means fixed on said propeller shaft and located between said pair of gears for selective engagement with said gears in response to axial shifting of said propeller shaft to afford selective rotation of said propeller shaft by said drive shaft in forward and rearward drives, means for axially shifting said propeller shaft relative to said lower unit between a first position wherein said dog means is engaged with one of said gears to afford forward drive and a second position wherein said dog means is engaged with the other of said gears to afford reverse drive, and means yieldably biasing said propeller shaft into said forward drive position.
Claim 2
Dependent Claim
156 words
A marine propulsion device comprising a lower unit including a vertically extending drive shaft having a driving pinion, an axially shiftable, rotatably mounted propeller shaft, a pair of gears meshed with said pinion and rotatably mounted in spaced relation to each other coaxially with said propeller shaft, dog means fixed on said propeller shaft and located between said pair of gears for selective engagement with said gears in response to axial shifting of said propeller shaft to afford selective rotation of said propeller shaft by said drive shaft in forward and rearward drives, means for axially shifting said propeller shaft relative to said lower unit between a first position wherein said dog means is engaged with one of said gears to afford forward drive and a second position wherein said dog means is engaged with the other of said gears to afford reverse drive, and means yieldably biasing said propeller shaft into said forward drive position.
Claim 3
Dependent Claim
20 words
A device in accordance with claim 1 wherein said means for axially shifting said propeller shaft comprises a mechanical linkage.
Claim 4
Dependent Claim
20 words
A device in accordance with claim 1 wherein said means for axially shifting said propeller shaft includes a hydraulic actuator.
Claim 5
Dependent Claim
31 words
A device in accordance with claim 3 wherein said means yieldably biasing said propeller shaft into said forward drive position also biases said propeller shaft into engagement with said hydraulic actuator.
Claim 6
Dependent Claim
27 words
A device in accordance with claim 1 wherein said biasing means includes a helical spring located in telescopic relation to the outer surface of said propeller shaft.
Claim 7
Dependent Claim
43 words
A device in accordance with claim 5 wherein said biasing means includes a shoulder on said propeller shaft, a seat on said lower unit at least partially surrounding said propeller shaft, and wherein said spring is engaged against said shoulder and said seat.
Claim 8
Dependent Claim
37 words
A device in accordance with claim 1 wherein said means for axially shifting said propeller shaft is located forwardly of said gears and said means for yieldably biasing said propellEr shaft is located rearwardly of said gears.
Claim 9
Dependent Claim
100 words
A device in accordance with claim 1 wherein said means for axially shifting said propeller shaft relative to said lower unit is located forwardly of said gears and includes a hydraulic actuator located for engagement with said propeller shaft and wherein said means for yieldably biasing said propeller shaft is located rearwardly of said gears and includes a shoulder on said propeller shaft, a seat on said lower unit at least partially surrounding said propeller shaft, and a helical spring located in telescopic relation to the outer surface of said propeller shaft and engaged against said shoulder and said seat.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |