US2501617A - Variable pitch propeller operating mechanism for marine propulsion plants - Google Patents

Variable pitch propeller operating mechanism for marine propulsion plants Download PDF

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Publication number
US2501617A
US2501617A US533512A US53351244A US2501617A US 2501617 A US2501617 A US 2501617A US 533512 A US533512 A US 533512A US 53351244 A US53351244 A US 53351244A US 2501617 A US2501617 A US 2501617A
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United States
Prior art keywords
gear
blades
propeller
variable pitch
shaft
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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 - Lifetime
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US533512A
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English (en)
Inventor
Roesch Fritz
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Individual
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Individual
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Filing date
Publication date
Priority to CH238619D priority Critical patent/CH238619A/de
Priority to CH247913D priority patent/CH247913A/de
Application filed by Individual filed Critical Individual
Priority to US533512A priority patent/US2501617A/en
Priority to DK149044AA priority patent/DK71121C/da
Priority to GB13311/44A priority patent/GB587242A/en
Priority to FR907086D priority patent/FR907086A/fr
Application granted granted Critical
Publication of US2501617A publication Critical patent/US2501617A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/02—Propeller-blade pitch changing actuated by control element coaxial with propeller shaft, e.g. the control element being rotary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/14—Use of propulsion power plant or units on vessels the vessels being motor-driven relating to internal-combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/06—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/06—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical
    • B63H3/08—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid
    • B63H3/081—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid actuated by control element coaxial with the propeller shaft

Definitions

  • the invention relates to an auxiliary device with one or more servomotors for adjusting the blades of a ships propeller.
  • the linkage for adjusting the blades is, as is well known, provided in the shaft.
  • the servomotor or servomotors be arranged in the propeller shaft and connected through gears with the blade-adjusting linkage provided inside the shaft in such a way that it is possible to remove a servomotor without dismantling the shafting.
  • Figs. 1 and 2 show arrangements for different types of linkage systems.
  • Figs. 3 and 4 illustrate the use of a servomotor which partly balances the forces acting through the linkage.
  • Figs. 5, 6 and 7 show the constructional design of the operating mechanism.
  • Figs. 8 and 9 show further arrangements.
  • Figs. 10-12 show the arrangement of the ad- Justing device in geared plants.
  • the ship's propeller l with its blades 2 and 3 is flanged to the propeller shaft 4, which is supported in the stern tube 5 and has at its forward end the thrust bearing 6, which serves to transmit the thrust of the propeller to the vessel.
  • the auxiliary device for adjusting the propeller blades consists of the following parts.
  • the adjusting shaft 1 Arranged in the propeller shaft 4 is the adjusting shaft 1, bearing at its aft end the spider 8, to which the links 9 of the blades 2 and 3 are movably connected in such a way that, when the shaft 1 turns in the direction of the arrowl0, the blades are moved from the ahead position shown in the drawing into the position for motion astern, that is, the blade 2 comes into the position here shown for the blade 3 and vice versa.
  • the adjusting angle through which the blades are turned is, for instance, about 40 or 50.
  • the angle of rotation of the shaft 1 may be equal to this or may differ from it according as the length of the links 9 corresponds to the'length of the arm of the spider 8 or differs from it so as to give a certain ratio of transmission.
  • the gear II is fitted between the flanges l2 and i3 of the propeller shaft 4 and is attached to the shaft 1 so that relative turning is impossible. It is driven through the pinions l4 of the servomotors l5, which are bolted on to the flange l3.
  • the supporting bearing IS on both sides of the gear ll takes the axial adjusting forces acting in the linkage system 1 to 9.
  • the servomotors I5 are designed correspondingly. They may be hydraulic, pneumatic or electric servomotors. Between the gear ll and the servomotors may be provided a gear with self-locking action, for instance through the interposition of worm gears.
  • the servomotors 22 have three pistons 23 and 24 in the form of spindles with threads which spaces provided between the blades 55 of the rotor 53. If the passages 5
  • the screw spindle servomotors 22 have the advantage that the hydraulic pressure on the driving screw piston 23 can beutilised for balancing the forces acting through the adjusting rod [3.
  • the pinions I4 and the gear I I in Fig. 3 are provided with simple helical teeth of such a type that the hydraulic pressure in the direction of the arrow 25 is transmitted through the axial components 26 of the: pressure of the teeth on the main gear and balances or at least partly balances the tensile pull 21 in the rod l3 when the blades 2 and 3 are adjusted from the ahead into the astern position, so that the load on the supporting bearing l6 amounts at most to the difference between the forces 26 and 21, and the '1.
  • the pinions I4 may have straight teeth and be provided at both sides with pressure discs 23, 23, which work together with the pressure rims on each side of the main gear I! (see Fig. 4).
  • the hydraulic forces 25 of the driving screw spindles during motion ahead are transmitted by the edges of the pressure discs 23, which are rigidly attached to the shafts of the pinions l4, to the pressure rim 33 in the form of axial forces 32, which balance completely or at least in part the tensile pull 21.
  • the discs 23 have a plane contact surface 33, while the discs 23 are provided with tapering pressure surfaces 34, which may for instance be inclined at an angle of 10 to be plane of the discs.
  • Figs. 5 to 7 the constructional details concerned in the fitting of the servomotors are illustrated.
  • the openings 46 into which the servomotor casing 45, which is at the same time the casing and support of the pinion I4, is pushed in order to be attached by means of bolts to the flange l3 of the propeller shaft 4.
  • the pressure medium is supplied to the servomotors through the ring mains 41 and 43.
  • Each servomotor is connected up to-these pipes through the branches 43 and 53, which lead to the passages 5
  • the main pipes 41 and 48 are connected through the pipes 51 and 58 with the passages 59 and 63, which are connected to the grooves 6
  • the control valve 64 connects one of the main pipes 41 and 48 in each case with one of the pipes 65 and 66 for the supply and discharge respectively of the pressure medium.
  • the valve 64 is adjusted by the piston 61 by means of pressure air or pressure oil from the pipe 33, which leads to the hand lever at the point of control, for instance the bridge of the vessel.
  • the return mechanism is operated by the push rod i 3, the ring 63 being connected by means of the pin 10 to the left-hand end of the push rod 13.
  • is adjusted by the ring 63, which rotates with the shaft 4,-so as to return the control valve 64 into the closed position in a known manner.
  • the control valve 64, each of the servomotors 45 and also the pinion l4 can be inspected and overhauled without the shaft 4 being dismantled.
  • the shaft '1 and the spider 3 can be used for adjusting the blades 2 and 3 in place of the screw gear I! and the push rod l3 in Figs. 2-5.
  • Fig. 8 the same system I, 3, 3, as used in Fig. 1 is provided for adjusting the blades 2 and 3. 0n the adjusting shaft 1 is keyed the toothed wheel i I, which is driven by the pinions 15. Each of these is driven through a screw gear 16 by the reciprocating servomotor pistons TI, two pistons being attached to each rod I6, which is guided through the axis of rotation of the pinion 15 and is provided with a steep-pitch thread.
  • the bore of the pinion 15 has a corresponding counter-thread, so that the reciprocating motion of the pistons I I, which are axially guided by the keys I8, and of the rod 16 is converted by the steep-pitch thread into a rotary motion of the pinion 15, in order to produce the rotary motion of the shaft 1 and of the spider 6 and thus the adjustment of the blades 2 and 3.
  • pistons 71 may be subjected to the pressure of the operating medium through the pipe I3 on their outside face only, so as to simplify the sealing of the casing.
  • the rod (6 may have the smallest possible diameter, it is preferable that it should be subjected only to tensile stress, as is shown in Fig. 9, where two servomotor pistons 11 are arranged on each side of the pinion '15, these being connected to the rod I6 by a yoke 33.
  • the pressure medium passes through the pipe 3
  • their axis of rotation may also be inclined or at right angles to the axis of the propeller shaft 4, while the toothed wheel H may be driven by means of a screw or a worm gear. In this way a higher transmission ratio can be obtained by means of a simple gear, with the result that the speed of the servomotor can be higher and its dimensions smaller.
  • the propeller 2a with its adjustagle blades la is driven through the propeller shaft 4g from the main wheel 5g of the toothed wheel gear, the pinions 6g of which are coupled to the engines To.
  • the adjusting'device to, an auxiliary motor operated by pressure medium is attached to the main wheel 5g on the side of the gear 59, to which is turned away from the propeller, and has a piston 9g which, when longitudinally displaced, is turned about its axis by the thread lllg and adjusts the blades So by means of the shaft Hg and the operating members Hg.
  • the pressure medium supply and its control are omitted from the drawing for the sake of simplicity.
  • the thrust bearing I lg In the shaft tunnel Hg behind the main wheel 5g is the thrust bearing I lg.
  • the linear ratio of the pinions 69 to the main wheel by may be approximately 1 :4 or less.
  • the gear 229, 23g has a transmission ratio equal to, smaller than or greater than unity. Adjustment of the blades of the propellers Hg is effected by means of the adjusting device 259, which is designed like the adjusting device 8 in Fig. 10. v
  • Fig. 12 also shows a multiple-screw vessel g, whose side propeller Sig with its variable pitch blades 32g is driven through the propeller shaft 339 and the gear 35g, 36g by a single engine 31g, which is designed as an opposed-piston engine and has two crankshafts 38a.
  • the gear 355], 369 for the drive of the propeller 3Ig serves at the same time as the gear connecting the crankshafts, as required in such opposed-piston engines.
  • the engine 31g is so far distant from the gear 359, 36g that the adjusting device 399 can be arranged on the side of the gear 35g, 36g turned away from the propeller My, between the gear and the engine 3151.
  • the piston g adjusts the blades 329 by means of the push rod lg and the links 429. g
  • Power may be supplied by any type of prime -movers, such as internal combustion engines,
  • an electric gear may also be arranged in such a way that the propelling engines drive high-speed generators whose current is supplied to electric motors driving the propeller shaft direct, these motors being arranged, for instance in the position of the main gear 59 in Fig. 10.
  • the electrical transmission ratio would result from the difference in the number of poles of generator and electric motor.
  • the adjusting device would be provided at the main gear as in Fig. 10, that is, it would be on the distal side of the electric motor in respect to the propeller, at the free end of the motor shaft, so that the rod connecting the adjusting device to the propeller blades 6 would also be” guided through the shaft of the. electric motor, 7
  • an axially movable blade pitch adjusting member having a threaded portion, an axially immovable helical gear havingan internal threaded portion engaging said first threaded portion and, upon rotation, effecting axial movement of said adjusting member, rotary motor means, a helical spur pinion connected with and driven by said motor meansand engaging said helical gear, and a housing encasing said gear and said pinion, said motor means being mounted on said housing, the relative direction of winding of said threaded portion and-of the teeth on said spur wheels and of the-teeth on said gears effecting counterbalancing of the axial thrust of said adjusting member.
  • an axially movable blade pitch adjusting member having a threaded portion, an axially immovable spur gear having an internal threaded portion engaging said first threaded portion and, upon rotation, effecting axial movement of said adjusting member, rotary motor means, a spur pinion connected with and driven by said motor means and engaging said spur gear, said gear having a pressure rim and said pinion having annular pressure means adjacent to said rim, and a housing encasing said gear and said pinion, said motor means being mounted on said housing, said rim and said pressure means effecting counterbalancing of the axial thrust of said adjusting member.
  • an axially movable blade pitch adjusting member having a threaded portion, an axially immovable rotatable member having a threaded portion en- 68 gaging said first threaded portion and, upon rotation, axially moving said adjusting member, motor means, a plurality of drive means driven by said motor means and disposed symmetrically around and rotating said rotatable member, and a housing encasing said rotatable member and said drive means, said motor means being mounted on said housing, said rotatable member and said drive means comprising pressure responsive means adapted to counterbalance the 75 axial thrust of said adjusting member;
  • an axially movable blade pitch adjusting member having a threaded. portion, an axially immovable helical spur gea'r having an internal threaded portion engaging said first threaded portion and, upon rotation, effecting axial movement of said adjusting member, rotary motor means, a helical spur pinion connected with and driven by said motor means and engaging said helical spur gear, and a housing encasing said gear and said pinion, said motor means being mounted on said housing, the relative direction of winding of said threaded portion and of the teeth on said spur gear effecting counterbalancing of the axial thrust of said adjusting member.
  • a pitch adjusting member In a mechanism for changing the pitch of the blades of a variable pitch propeller, a pitch adjusting member, an axially immovable rotatable actuating member connected with and actuating said adjusting member, motor means, drive means connected with and driven by said motor means and rotating said rotatable member, and a housing encasing said drive means and said rotatable member and supporting said motor means, said rotatable member and said drive means comprising thrust absorbing means for the axial thrust of said adjusting member.
  • said motor means being of the screw pump type and exerting thrust on said pinion in a direction opposite to the thrust exerted on said gear by said adjusting member.
  • a pitch adjusting member In a mechanism for changing the pitch of the blades of a variable pitch propeller, a pitch adjusting member, an axially immovable gear connected with and actuating said adjusting member, motor means, a pinion connected with and driven by said motor means and rotating said gear and said pinion having annular surface portions engaging one another and absorbing the axial thrust of said adjusting member.
  • said motor means being of the screw pump type and exerting axial thrust on said pinion in a direction opposite to that of the thrust exerted on said gear by said adjusting member.
US533512A 1943-05-27 1944-05-01 Variable pitch propeller operating mechanism for marine propulsion plants Expired - Lifetime US2501617A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CH238619D CH238619A (de) 1943-05-27 1943-05-27 Schiff.
CH247913D CH247913A (de) 1943-05-27 1943-08-28 Vorrichtung zum Verstellen der Flügel einer Schiffsschraube.
US533512A US2501617A (en) 1943-05-27 1944-05-01 Variable pitch propeller operating mechanism for marine propulsion plants
DK149044AA DK71121C (da) 1943-05-27 1944-05-23 Anordning ved omstyringsmekanismer til skruer med drejelige blade.
GB13311/44A GB587242A (en) 1943-05-27 1944-07-12 Improvements in or relating to apparatus for operating a ship's variable pitch propeller
FR907086D FR907086A (fr) 1943-05-27 1944-07-28 Dispositif de réglage par servo-moteur des pales d'hélices de navires

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH238619T 1943-05-27
CH247913T 1943-08-28
US533512A US2501617A (en) 1943-05-27 1944-05-01 Variable pitch propeller operating mechanism for marine propulsion plants

Publications (1)

Publication Number Publication Date
US2501617A true US2501617A (en) 1950-03-21

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US533512A Expired - Lifetime US2501617A (en) 1943-05-27 1944-05-01 Variable pitch propeller operating mechanism for marine propulsion plants

Country Status (5)

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US (1) US2501617A (de)
CH (2) CH238619A (de)
DK (1) DK71121C (de)
FR (1) FR907086A (de)
GB (1) GB587242A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675084A (en) * 1947-08-26 1954-04-13 Harry J Nichols Controllable reversible pitch propeller
US2754923A (en) * 1952-06-30 1956-07-17 John H Strandell Single crank controllable pitch propeller
US2804154A (en) * 1952-02-19 1957-08-27 Gen Motors Corp Concurrent blade pitch control of coaxial propellers
US3006419A (en) * 1961-10-31 klaassen etal
US3043374A (en) * 1959-01-27 1962-07-10 Robert G Letourneau Propeller and rotating propeller control mechanism for marine propulsion
US3146723A (en) * 1959-04-13 1964-09-01 Wildhaber Ernest Screw pump unit
US3422790A (en) * 1966-11-14 1969-01-21 Calvin C Connell Multiengine drive arrangement
US4246862A (en) * 1979-03-07 1981-01-27 Deal Troy M Self-cleaning weedless propeller
US5803776A (en) * 1993-07-15 1998-09-08 Slynko; Petr Petrovich Partially immersible propeller
US6287077B1 (en) * 1999-02-18 2001-09-11 Nasyc Holding S. A. Adjustable-pitch boat propeller
US20040169108A1 (en) * 2003-02-27 2004-09-02 Terpay Gregory W. Fluid conduit for use with hydraulic actuator

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US617633A (en) * 1899-01-10 brinkmann
US630648A (en) * 1899-04-19 1899-08-08 Robert E Brewer Rotary engine.
US715395A (en) * 1902-05-01 1902-12-09 Simon Lake Propeller-controlling device for submarine boats.
US1103117A (en) * 1914-03-05 1914-07-14 James George Weir Geared propeller-drive for ships.
US1310330A (en) * 1919-07-15 ferrier
CH81702A (de) * 1918-10-16 1919-11-17 Anton Kolarik Gestell für Kochgeschirre
GB154264A (en) * 1919-07-17 1920-10-18 Henry Leitner Improvements in variable pitch airscrews
GB190746A (en) * 1921-07-28 1922-12-28 Charles Frederic Heywood Improvements in or relating to the driving equipments of aeronautical craft
US1453532A (en) * 1923-01-02 1923-05-01 Frederick R Stevens Steam-engine-valve-reversing gear
US1456008A (en) * 1922-02-24 1923-05-22 Nuanes Alfred Aeroplane propeller
US1607833A (en) * 1922-05-29 1926-11-23 Allis Chalmers Mfg Co Hydraulic machine
US1677980A (en) * 1925-08-05 1928-07-24 Montelius Carl Oscar Josef Rotary pump, motor, meter, or the like
US1847693A (en) * 1930-01-10 1932-03-01 Kindervater Julius Power device for operating reverse gears
US1853139A (en) * 1932-04-12 Hydbattlic ttjbbine
US1877048A (en) * 1928-07-05 1932-09-13 Harry E Popp Adjustable vane hydraulic turbine
US1879659A (en) * 1929-06-17 1932-09-27 Coolidge Propeller Company Regulator for adjusting the pitch to propeller blades while in motion
US1898697A (en) * 1931-11-09 1933-02-21 Milton D Thompson Apparatus for changing the pitch angle of reversible-blade screw propellers
US1915465A (en) * 1931-03-23 1933-06-27 Elton D Peterson Variable pitch propeller
US1945900A (en) * 1926-03-25 1934-02-06 Huguenin Albert Rotor wheel
US1950776A (en) * 1932-12-15 1934-03-13 James Leffel & Company Hydraulic turbine
US1982284A (en) * 1932-08-27 1934-11-27 Aero Engineering Corp Propeller control mechanism
US2077648A (en) * 1934-07-28 1937-04-20 Thompson Thomas Water turbine
GB468602A (en) * 1935-11-11 1937-07-08 Messerschmitt Boelkow Blohm Improvements in and relating to variable pitch air-screws
US2095167A (en) * 1935-02-26 1937-10-05 Burghauser Franz Screw pump
US2210009A (en) * 1938-08-10 1940-08-06 Robert J Ruths Hydraulic operated variable pitch propeller
US2232683A (en) * 1940-04-25 1941-02-25 Charles W Lloyd Pitch changing mechanism for oppositely rotating propellers for aircraft
US2279301A (en) * 1938-09-28 1942-04-14 Hammond Jr Variable pitch propeller control
US2284473A (en) * 1938-05-27 1942-05-26 Vega Aircraft Corp Multiple motor drive for aircraft propellers
GB547894A (en) * 1940-03-29 1942-09-16 Sulzer Ag Improvements in or relating to plant for the propulsion of a vehicle, ship or the like
US2297400A (en) * 1938-10-24 1942-09-29 Friedrich Albert Driving mechanism for air propellers
US2360982A (en) * 1942-07-03 1944-10-24 Morgan Smith S Co Reversible screw propeller operating mechanism
US2370675A (en) * 1943-08-10 1945-03-06 Howard M Mccoy Multiple stage means for changing pitch of aircraft propeller blades
US2433990A (en) * 1943-08-13 1948-01-06 Marquette Metal Products Co Controllable pitch propeller mechanism

Patent Citations (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1853139A (en) * 1932-04-12 Hydbattlic ttjbbine
US1310330A (en) * 1919-07-15 ferrier
US617633A (en) * 1899-01-10 brinkmann
US630648A (en) * 1899-04-19 1899-08-08 Robert E Brewer Rotary engine.
US715395A (en) * 1902-05-01 1902-12-09 Simon Lake Propeller-controlling device for submarine boats.
US1103117A (en) * 1914-03-05 1914-07-14 James George Weir Geared propeller-drive for ships.
CH81702A (de) * 1918-10-16 1919-11-17 Anton Kolarik Gestell für Kochgeschirre
GB154264A (en) * 1919-07-17 1920-10-18 Henry Leitner Improvements in variable pitch airscrews
GB190746A (en) * 1921-07-28 1922-12-28 Charles Frederic Heywood Improvements in or relating to the driving equipments of aeronautical craft
US1456008A (en) * 1922-02-24 1923-05-22 Nuanes Alfred Aeroplane propeller
US1607833A (en) * 1922-05-29 1926-11-23 Allis Chalmers Mfg Co Hydraulic machine
US1453532A (en) * 1923-01-02 1923-05-01 Frederick R Stevens Steam-engine-valve-reversing gear
US1677980A (en) * 1925-08-05 1928-07-24 Montelius Carl Oscar Josef Rotary pump, motor, meter, or the like
US1945900A (en) * 1926-03-25 1934-02-06 Huguenin Albert Rotor wheel
US1877048A (en) * 1928-07-05 1932-09-13 Harry E Popp Adjustable vane hydraulic turbine
US1879659A (en) * 1929-06-17 1932-09-27 Coolidge Propeller Company Regulator for adjusting the pitch to propeller blades while in motion
US1847693A (en) * 1930-01-10 1932-03-01 Kindervater Julius Power device for operating reverse gears
US1915465A (en) * 1931-03-23 1933-06-27 Elton D Peterson Variable pitch propeller
US1898697A (en) * 1931-11-09 1933-02-21 Milton D Thompson Apparatus for changing the pitch angle of reversible-blade screw propellers
US1982284A (en) * 1932-08-27 1934-11-27 Aero Engineering Corp Propeller control mechanism
US1950776A (en) * 1932-12-15 1934-03-13 James Leffel & Company Hydraulic turbine
US2077648A (en) * 1934-07-28 1937-04-20 Thompson Thomas Water turbine
US2095167A (en) * 1935-02-26 1937-10-05 Burghauser Franz Screw pump
GB468602A (en) * 1935-11-11 1937-07-08 Messerschmitt Boelkow Blohm Improvements in and relating to variable pitch air-screws
US2284473A (en) * 1938-05-27 1942-05-26 Vega Aircraft Corp Multiple motor drive for aircraft propellers
US2210009A (en) * 1938-08-10 1940-08-06 Robert J Ruths Hydraulic operated variable pitch propeller
US2279301A (en) * 1938-09-28 1942-04-14 Hammond Jr Variable pitch propeller control
US2297400A (en) * 1938-10-24 1942-09-29 Friedrich Albert Driving mechanism for air propellers
GB547894A (en) * 1940-03-29 1942-09-16 Sulzer Ag Improvements in or relating to plant for the propulsion of a vehicle, ship or the like
US2232683A (en) * 1940-04-25 1941-02-25 Charles W Lloyd Pitch changing mechanism for oppositely rotating propellers for aircraft
US2360982A (en) * 1942-07-03 1944-10-24 Morgan Smith S Co Reversible screw propeller operating mechanism
US2370675A (en) * 1943-08-10 1945-03-06 Howard M Mccoy Multiple stage means for changing pitch of aircraft propeller blades
US2433990A (en) * 1943-08-13 1948-01-06 Marquette Metal Products Co Controllable pitch propeller mechanism

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006419A (en) * 1961-10-31 klaassen etal
US2675084A (en) * 1947-08-26 1954-04-13 Harry J Nichols Controllable reversible pitch propeller
US2804154A (en) * 1952-02-19 1957-08-27 Gen Motors Corp Concurrent blade pitch control of coaxial propellers
US2754923A (en) * 1952-06-30 1956-07-17 John H Strandell Single crank controllable pitch propeller
US3043374A (en) * 1959-01-27 1962-07-10 Robert G Letourneau Propeller and rotating propeller control mechanism for marine propulsion
US3146723A (en) * 1959-04-13 1964-09-01 Wildhaber Ernest Screw pump unit
US3422790A (en) * 1966-11-14 1969-01-21 Calvin C Connell Multiengine drive arrangement
US4246862A (en) * 1979-03-07 1981-01-27 Deal Troy M Self-cleaning weedless propeller
US5803776A (en) * 1993-07-15 1998-09-08 Slynko; Petr Petrovich Partially immersible propeller
US6287077B1 (en) * 1999-02-18 2001-09-11 Nasyc Holding S. A. Adjustable-pitch boat propeller
EP1029781A3 (de) * 1999-02-18 2002-04-03 Nasyc Holding S.A. Verstellpropeller, insbesondere für Motor- und Sportboote
US20040169108A1 (en) * 2003-02-27 2004-09-02 Terpay Gregory W. Fluid conduit for use with hydraulic actuator
US6863239B2 (en) 2003-02-27 2005-03-08 General Dynamics Advanced Information Systems, Inc. Fluid conduit for use with hydraulic actuator

Also Published As

Publication number Publication date
FR907086A (fr) 1946-02-28
CH247913A (de) 1947-03-31
GB587242A (en) 1947-04-18
CH238619A (de) 1945-07-31
DK71121C (da) 1950-06-12

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