US3594099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pitch adjustment in screw-bladed devices, such as propellers
Assignee: Federal Mogul Engineering Ltd
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Filing: 1969-04-25
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Granted: 1971-07-20
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Expires: 1989-04-25
Abstract
Abstract A propeller having a boss to which are bolted fixed blades which can be located at the required pitch by means of dowels engaging in pairs of registering holes in the boss and the blade root, a number of different sets of holes being provided to give different pitch settings.
Inventors
- 👤 Colin Wray Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:32
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A screw-bladed device comprising a boss, a plurality of blades, contacting faces on each of said blades and said boss, means detachably securing each of said blades to said boss with said contacting faces of said blades and said boss in engagement, a plurality of holes in each of said contacting faces, said holes being arranged in pairs in said contacting faces, one hole of each pair being in one set of said blades and the other hole of each pair being in said boss, the holes of the various pairs being arranged to be in register at different angular positions of the blade, and a plurality of dowels corresponding in number to said blades, one of said dowels being fitted in a registering pair of holes of each of said contacting faces of said blades and said boss to establish the pitch of each of the blades.
Claim 2
Dependent Claim
148 words
A screw-bladed device comprising a boss, a plurality of blades, contacting faces on each of said blades and said boss, means detachably securing each of said blades to said boss with said contacting faces of said blades and said boss in engagement, a plurality of holes in each of said contacting faces, said holes being arranged in pairs in said contacting faces, one hole of each pair being in one set of said blades and the other hole of each pair being in said boss, the holes of the various pairs being arranged to be in register at different angular positions of the blade, and a plurality of dowels corresponding in number to said blades, one of said dowels being fitted in a registering pair of holes of each of said contacting faces of said blades and said boss to establish the pitch of each of the blades.
Claim 3
Dependent Claim
44 words
A device as claimed in claim 1 having for each pitch position of each blade at least one further pair of registering holes, and having a further dowel fitted in the further registering pair of holes corresponding to the established pitch of each blade.
Claim 4
Dependent Claim
45 words
A device as claimed in claim 2 in which each blade has an annular flange at its root and the boss has a mounting flange for each blade flange, said securing means comprising bolts fixing said blade flanges to said mounting flanges on said boss.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |