Patent US3754837A successfully refreshed from Google Patents.
US3754837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variably ventilated propeller
Assignee: Outboard Marine Corp
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Filing: 1972-06-05
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Granted: 1973-08-28
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Expires: 1992-06-05
Abstract
Abstract Disclosed herein is a marine propulsion device comprising a propeller shaft supported by a lower unit and extending rearwardly through an exhaust gas opening in the lower unit, a propeller having a hub adapted for discharging exhaust gas there through and mounted on the rearwardly extending propeller shaft for common rotary movement with the propeller shaft and for axial movement relative to the propeller shaft between a first, forwardly located position and a second position located rearwardly of the forward position with the propeller spaced axially rearwardly of the lower unit exhaust gas opening, together with means biasing the propeller toward the rearward position.
Inventors
- 👤 W Shimanckas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:09
CPC Classifications
B; B63; B63H; B63H20/00; B63H20/24; B63H20/245; B63H23/00; B63H23/32; B63H23/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
177 words
A marine propulsion device comprising a lower unit with a portion which is normally submerged in water and which includes a rearWardly facing exhaust gas opening, a propeller shaft supported by said lower unit and extending rearwardly through said exhaust gas opening, means rotationally driving said propeller shaft, means for conducting exhaust gas to said lower unit portion, a propeller mounted on said propeller shaft rearwardly of said exhaust gas opening in said lower unit portion for common rotary movement with said propeller shaft between a first, forwardly located position and a second position located rearwardly of said forward position with said propeller spaced rearwardly of said exhaust gas opening in said lower unit portion, said propeller including an exhaust gas passageway including an inlet located at the forward end of said propeller in communication with said exhaust gas opening in said lower unit portion when said propeller is in said forward position and further including a rearwardly located outlet, and means between said lower unit and said propeller for biasing said propeller toward said rearward position.
Claim 2
Dependent Claim
177 words
A marine propulsion device comprising a lower unit with a portion which is normally submerged in water and which includes a rearWardly facing exhaust gas opening, a propeller shaft supported by said lower unit and extending rearwardly through said exhaust gas opening, means rotationally driving said propeller shaft, means for conducting exhaust gas to said lower unit portion, a propeller mounted on said propeller shaft rearwardly of said exhaust gas opening in said lower unit portion for common rotary movement with said propeller shaft between a first, forwardly located position and a second position located rearwardly of said forward position with said propeller spaced rearwardly of said exhaust gas opening in said lower unit portion, said propeller including an exhaust gas passageway including an inlet located at the forward end of said propeller in communication with said exhaust gas opening in said lower unit portion when said propeller is in said forward position and further including a rearwardly located outlet, and means between said lower unit and said propeller for biasing said propeller toward said rearward position.
Claim 3
Dependent Claim
38 words
A marine propulsion device in accordance with claim 1 and further including means on said propeller for preventing egress of exhaust gas between said lower unit portion and said propeller when said propeller is in said forward position.
Claim 4
Dependent Claim
30 words
A marine propulsion device in accordance with claim 1 and further including means preventing egress of exhaust gas from said propeller outlet when said propeller is in said rearward position.
Claim 5
Dependent Claim
42 words
A marine propulsion device in accordance with claim 3 wherein said means preventing egress of exhaust gas from said propeller outlet comprises a member fixed on said propeller shaft aft of said propeller and including an outwardly extending portion closing said outlet.
Claim 6
Dependent Claim
80 words
A marine propulsion device in accordance with claim 4 wherein said propeller includes radially spaced inner and outer hubs defining therebetween said outlet, and wherein said member further includes a forwardly extending cylindrical portion engageable with said inner hub when said propeller is in said rearward position, and a circumferentially spaced series of apertures located radially inwardly of said cylindrical portion, and wherein said outer portion is engageable with said outer hub when said propeller is in said rearward position.
Claim 7
Dependent Claim
56 words
A marine propulsion device in accordance with claim 1 wherein said propeller biasing means comprises a collar fixed on said propeller shaft against forward movement relative to said propeller shaft, and a helical spring encircling said propeller shaft and seated, at its forward end, against said collar, and seated, at its rearward end, against said propeller.
Claim 8
Dependent Claim
56 words
A marine propulsion device in accordance with claim 2 wherein said propeller biasing means comprises a collar fixed on said propeller shaft against forward movement relative to said propeller shaft, and a helical spring encircling said propeller shaft and seated, as its forward end, against said collar, and seated, at its rearward end, against said propeller.
Claim 9
Dependent Claim
56 words
A marine propulsion device in accordance with claim 3 wherein said propeller biasing means comprises a collar fixed on said propeller shaft against forward movement relative to said propeller shaft, and a helical spring encircling said propeller shaft and seated, as its forward end, against said collar, and seated, at its rearward end, against said propeller.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |