US3757728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guide vane for suction side of marine jet propulsion system
Assignee: HARDIN MARINE A CORP OF
•
Filing: 1972-03-20
•
Granted: 1973-09-11
•
Expires: 1992-03-20
Abstract
Abstract In a jet boat having a jet nozzle, an impeller pump discharging water through the nozzle, and a flow channel delivering water from below the boat to the impeller, the improvement wherein a fixed guide vane is disposed in the flow channel to divide the flow channel into upper and lower flow portions. At boat speeds greater than the impeller entrance velocity, the fixed guide vane causes an automatic adjustment of volume rates of flow of water through each flow channel portion so that a volume rate of water equal to the flow capacity of the impeller flows freely and smoothly through the flow channel, such water being distributed uniformly around the entrance of the impeller.
Inventors
- 👤 R Rhoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:53
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/02; B63H11/04; B63H11/08; B63H11/10; B63H11/103
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
164 words
In a jet boat having a rearwardly projecting water jet nozzle, an engine-driven impeller pump discharging water into said nozzle and means forming a flow channel for water extending forwardly and downwardly from the inlet of said impeller pump, said flow channel extending through the bottom of the hull of said boat and having an inlet opening substantially flush with the bottom of said hull, said flow channel having a crosssectional area substantially equal to the area of said impeller pump inlet, the improvement comprising: vane means disposed in and across said flow channel to divide said channel into upper and lower flow portions, said vane means projecting outwardly and forwardly from the inlet of said flow channel a substantial distance beyond a line drawn between the forward and rearward edges of said flow channel inlet, and having a generally horizontal forward edge below the forward edge of said flow channel inlet, said vane means extending rearwardly a substantial distance in said flow channel.
Claim 2
Dependent Claim
164 words
In a jet boat having a rearwardly projecting water jet nozzle, an engine-driven impeller pump discharging water into said nozzle and means forming a flow channel for water extending forwardly and downwardly from the inlet of said impeller pump, said flow channel extending through the bottom of the hull of said boat and having an inlet opening substantially flush with the bottom of said hull, said flow channel having a crosssectional area substantially equal to the area of said impeller pump inlet, the improvement comprising: vane means disposed in and across said flow channel to divide said channel into upper and lower flow portions, said vane means projecting outwardly and forwardly from the inlet of said flow channel a substantial distance beyond a line drawn between the forward and rearward edges of said flow channel inlet, and having a generally horizontal forward edge below the forward edge of said flow channel inlet, said vane means extending rearwardly a substantial distance in said flow channel.
Claim 3
Dependent Claim
64 words
In a jet boat as set forth in claim 1, wherein the angle between a line from the forward edge of said vane means to the rearward edge of said flow channel inlet and a line drawn parallel to the hull line of said boat and through the forward edge of said vane means is substantially equal to the planing angle of said boat.
Claim 4
Dependent Claim
49 words
In a jet boat as set forth in claim 2, wherein said vane means has a plurality of guide surfaces on the rearward portion of said vane means to direct streams of water flowing through said upper flow channel portion to preselected areas spaced around the impeller pump inlet.
Claim 5
Dependent Claim
27 words
In a jet boat as set forth in claim 1, wherein the rearward end of said vane means terminates a substantial distance from said impeller pump inlet.
Claim 6
Dependent Claim
42 words
In a jet boat as set forth in claim 1, wherein said upper flow portion of said flow channel between said vane means and the upper part of said flow channel progressively increases in cross-sectional area rearwardly from the flow channel inlet.
Claim 7
Dependent Claim
49 words
In a jet boat as set forth in claim 1, wherein said vane means has a plurality of guide surfaces on the rearward portions of said vane means to direct streams of water flowing through said upper flow channel portion to preselected areas spaced around the impeller pump inlet.
Claim 8
Dependent Claim
70 words
In a jet boat as set forth in claim 6, wherein said vane means has a central guide surface directing approximately a third of the water flowing through said upper flow channel portion to the lower area of said impeller pump inlet and two side guide surfaces each directing approximately a third of the water flowing through said upper flow channel portion to upper areas of said impeller pump inlet.
Claim 9
Dependent Claim
59 words
In a jet boat as set forth in claim 1, wherein said upper flow portion of said flow channel between said vane means and the upper part of said flow channel progressively increases in cross-sectional area rearwardly from the flow channel inlet and said vane means terminates at its rearward end a substantial distance from said impeller pump inlet.
Claim 10
Dependent Claim
47 words
In a jet boat as set forth in claim 8, wherein said vane means has a plurality of guide surfaces on the rearward portion of said vane means to direct water flowing through said upper flow channel portion to preselected areas spaced around the impeller pump inlet.
Claim 11
Dependent Claim
71 words
In a jet boat as set forth in claim 9, wherein said vane means has a central guide surface directing approximately a third of the water flowing through said upper flow channel portion to the lower area of said impeller pump inlet and two side guide surfaces each directing approximateLy a third of the water flowing through said upper flow channel portion to upper areas of the said impeller pump inlet.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |