GB499518A - Improvements in or relating to variable pitch screw propellers - Google Patents
Improvements in or relating to variable pitch screw propellersInfo
- Publication number
- GB499518A GB499518A GB2530637A GB2530637A GB499518A GB 499518 A GB499518 A GB 499518A GB 2530637 A GB2530637 A GB 2530637A GB 2530637 A GB2530637 A GB 2530637A GB 499518 A GB499518 A GB 499518A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sleeve
- ram
- blades
- propeller
- blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/02—Hub construction
- B64C11/04—Blade mountings
- B64C11/06—Blade mountings for variable-pitch blades
Abstract
499,518. Airscrews. BRITISH THOMSON-HOUSTON CO., Ltd., and ROE, E. W. Sept. 17, 1937, No. 25306. [Class 114] In a variable-pitch screw propeller each blade has a hollow root portion rotatably mounted over a spigot on the boss and a threaded sleeve member is located between them, one end of it terminating in a ram, the blades and spigots having relatively inclined threads co-operating with threads on the sleeve member whereby, when pressure is applied to the ram, the parts are displaced so as to rotate the blades for pitch variation. The blade 4 has an inner bush 8, which is secured thereto by screws 10 and carries a bevel wheel 25. This sleeve is splined at 9 to engage splines on a ram sleeve 11, the upper part of which projects into a chamber 22 which is in communication by ducts 21 with passages in the propeller hub and shaft leading to a fixed pipe supply 13. The inner part of the ram member 11 has helical splines which engage corresponding helical keys on the boss spigot 9. With increase in revolutions, the sleeve block 4, under centrifugal force, tends to move outwardly and restraint thereto is applied by the fluid pressure in the space 22. A second set of supply ports 24 may be formed at a different position relative to the travel of the sleeve whereby the degree of movement of the sleeve can be controlled by using different pressures of oil supply. Where the weight of the ram members 11 is not sufficient, the gearwheels 25 may gear with others on axes at right-angles which are secured to similar movable sleeves, but these do not directly operate other propeller blades. Alternatively, there may be fitted at the base of the sleeve a spring supplementing the centrifugal force and tending to cause it to move outwards, in which case the member 11 can be lighter in weight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2530637A GB499518A (en) | 1937-09-17 | 1937-09-17 | Improvements in or relating to variable pitch screw propellers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2530637A GB499518A (en) | 1937-09-17 | 1937-09-17 | Improvements in or relating to variable pitch screw propellers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB499518A true GB499518A (en) | 1939-01-25 |
Family
ID=10225563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2530637A Expired GB499518A (en) | 1937-09-17 | 1937-09-17 | Improvements in or relating to variable pitch screw propellers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB499518A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2415421A (en) * | 1944-05-13 | 1947-02-11 | Filippis Raymond De | Adjustable propeller |
US2528281A (en) * | 1945-05-30 | 1950-10-31 | Gen Motors Corp | Aircraft propeller |
US2533415A (en) * | 1943-02-04 | 1950-12-12 | United Aircraft Corp | Variable pitch propeller |
DE918073C (en) * | 1939-06-16 | 1954-09-16 | Gen Motors Corp | Adjustable propeller |
US3412808A (en) * | 1967-10-06 | 1968-11-26 | Thompson Wendell L | Variable pitch propeller for boat |
US4810164A (en) * | 1986-12-24 | 1989-03-07 | Rolls-Royce Plc | Pitch change arrangement for a variable pitch fan |
GB2397627A (en) * | 2000-12-19 | 2004-07-28 | Pro Design Solutions Ltd | Pitch adjustment mechanism |
WO2018234328A1 (en) | 2017-06-19 | 2018-12-27 | Rolls-Royce Marine As | Rotary actuator, variable pitch hub, propeller mount |
-
1937
- 1937-09-17 GB GB2530637A patent/GB499518A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE918073C (en) * | 1939-06-16 | 1954-09-16 | Gen Motors Corp | Adjustable propeller |
US2533415A (en) * | 1943-02-04 | 1950-12-12 | United Aircraft Corp | Variable pitch propeller |
US2415421A (en) * | 1944-05-13 | 1947-02-11 | Filippis Raymond De | Adjustable propeller |
US2528281A (en) * | 1945-05-30 | 1950-10-31 | Gen Motors Corp | Aircraft propeller |
US3412808A (en) * | 1967-10-06 | 1968-11-26 | Thompson Wendell L | Variable pitch propeller for boat |
US4810164A (en) * | 1986-12-24 | 1989-03-07 | Rolls-Royce Plc | Pitch change arrangement for a variable pitch fan |
GB2397627A (en) * | 2000-12-19 | 2004-07-28 | Pro Design Solutions Ltd | Pitch adjustment mechanism |
WO2018234328A1 (en) | 2017-06-19 | 2018-12-27 | Rolls-Royce Marine As | Rotary actuator, variable pitch hub, propeller mount |
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