GB637323A - Improvements relating to variable pitch propellers - Google Patents
Improvements relating to variable pitch propellersInfo
- Publication number
- GB637323A GB637323A GB20782/47A GB2078247A GB637323A GB 637323 A GB637323 A GB 637323A GB 20782/47 A GB20782/47 A GB 20782/47A GB 2078247 A GB2078247 A GB 2078247A GB 637323 A GB637323 A GB 637323A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screw
- blades
- pump
- valve
- pitch
- 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
- B64C11/30—Blade pitch-changing mechanisms
- B64C11/306—Blade pitch-changing mechanisms specially adapted for contrarotating propellers
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
637,323. Variable-pitch propellers. GENERAL MOTORS CORPORATION. July 31, 1947, No. 20782. Convention date, Oct. 21, 1940. [Class 114] In a tandem variable-pitch air-screw rotated in opposite directions by a single engine the rear screw is controlled externally whilst the pitch of the forward screw is adjusted to correspond to the pitch of the rear screw blades. The blades c of the rear screw are operated by supplying pressure fluid from the pump j, above or below the piston l under the control of the valve i. The pump is driven by contact with a doublelobed face cam k. The control valve is moved radially by centrifugal force to maintain a constant speed against the action of a spring h, the set speed being adjusted by moving the roller g by longitudinal movement of the collar e from the control lever d. The forward blade cc is similarly adjusted by supplying pressure fluid from the pump jj above or below the piston ll under the control of the valve ii, the pump being driven by the single lobed face cam kk. The control valve is adjusted by the bell-crank lever xx from the collar ee moved longitudinally by screw and nut gearing driven by the movement of the ring gear o connecting the roots of the blades c. The valve ii is also moved by the follow-up gear link ss one end of which is attached to the rod uu operating the bell-crank xx and the other end of which follows the cam slot rr in the crown wheel oo. The cam slot can be shaped so that the blades of the forward propeller exactly copy the movements of those of the rear propeller or they may have a proportional movement only. Specifications 544,580 and 545,520 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US637323XA | 1940-10-21 | 1940-10-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB637323A true GB637323A (en) | 1950-05-17 |
Family
ID=22051116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20782/47A Expired GB637323A (en) | 1940-10-21 | 1947-07-31 | Improvements relating to variable pitch propellers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB637323A (en) |
-
1947
- 1947-07-31 GB GB20782/47A patent/GB637323A/en not_active Expired
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