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| Number | Title | Issue Date |
| 7156707 | Marine propulsion system A marine propulsion system comprising a push rod (50) for adjusting the pitch of propeller blades (34). The push rod (50) has a screw-threaded bolt (60) engaged with a nut (78). The nut (78) carries a bevel gear (84) ... | 01/02/2007 |
| 6478542 | Variable pitch propeller having centrifugal lock A variable pitch propeller has a centrifugal lock for blocking blade pitch changes from a normal range of forward pitch angles toward both feathered and reverse positions at rotational speeds greater than a predetermined threshold. The lock mechanism has ... | 11/12/2002 |
| 6358007 | Universal constant speed variable pitch boat propeller system An adjustable pitch boat propeller system adapted for mounting on a drive shaft of a marine drive unit of a boat. The propeller includes an hub that has been adapted for mounting over the drive shaft of the boat, the hub having an external surface and int... | 03/19/2002 |
| 6261062 | Actuation system for a controllable pitch propeller A controllable pitch propeller device is provided with a pitch locking system that prevents a controllable pitch propeller blade from being inadvertently forced to an extreme end of travel in the event that hydraulic pressure is lost in either of two cond... | 07/17/2001 |
| 6077040 | Control system for blades for a variable pitch propeller A system for controlling propeller blade pitch is disclosed. The system comprises a transfer tube, wherein the transfer tube defines an element of the rotatable portion and wherein the transfer tube is non-translating relative the rotatable and non-rotata... | 06/20/2000 |
| 5836743 | Variable pitch counterweighted propeller system with releasable hydraulic pitchlock The hydraulic propeller system of the present invention has a central hub including a stationary portion and a rotatable portion. A plurality of propeller blades are connected with the rotatable portion, wherein each of the plurality of propeller blades h... | 11/17/1998 |
| 5213471 | Propeller pitch control The invention concerns a system for controlling an aircraft propeller. A hydraulic motor controls pitch of the propeller blades. The propeller blades are characterized by the absence of feather-inducing counterweights. An overspeed governor senses when pr... | 05/25/1993 |
| 5161948 | Propulsor pitchlock and feather stop A pitch change actuation system for changing the pitch of the blades (16) of a prop-fan propulsor (10) comprises a translating pitch change actuator (30) and a flexible feather latch member (50) including a feather stop (56) and a feather latch (58), the ... | 11/10/1992 |
| 4872811 | Inboard servo for marine controllable pitch propellers An inboard servo for a controllable pitch propeller of the force rod type comprises a feedback device having at least two feedback rods connected to the piston and extending through the cylinder end wall and an output ring connected to the rods. An emerge... | 10/10/1989 |
| 4863347 | Bladed rotor assemblies A bladed rotor assembly comprising: a bladed rotor; an actuator for effecting a change of blade pitch; a first valve member connected to, and movable with, the actuator and having first and second passageways; and a second valve member co-operable with the first va... | 09/05/1989 |
| 4711615 | Turboprop overspeed protection system An overspeed protection system is provided for a turboprop engine. The engine includes a governor pump and a constant speed governor both of which are driven by the turbine through a gear reduction assembly. The constant speed governor is in communication... | 12/08/1987 |
| 4678402 | Variable pitch propeller An impulse activated and controlled variable pitch propeller whereby the complete high pressure hydraulic system is incorporated in propeller hub assembly, including two identical type reciprocating hydraulic pumps which operate and control the propeller ... | 07/07/1987 |
| 4650402 | Aircraft propeller with blade pitch adjustment for feather and reverse positions A propeller hub supports a plurality of adjustable pitch propeller blades which are rotated by a hydraulic cylinder and control system between a feather position and a reverse position through low and high pitch positions. The reverse pitch position is pr... | 03/17/1987 |
| 4648798 | Controllable pitch aircraft propeller A variable pitch propeller, particularly suited for use with turbine engines, includes a range of beta control in low pitch and reverse pitch positions, in which the pilot can obtain a ground angle range with substantially lower angles in relation to the ... | 03/10/1987 |
| 4643643 | Apparatus for adjusting and locking pitch of a variable pitch propeller on a ship Apparatus for adjusting and locking the pitch of a variable pitch propeller. Within a propeller shaft, a hydraulic piston is provided which drives a rod, a plate, and levers to rotate the propeller blades in, and with respect to, the hub of the propeller.... | 02/17/1987 |
| 4456430 | Vehicle employing a fluid motor with arrangements In a vehicle or device a fluid motor is employed to drive rotary members, such as wheels, propellers, tracks. The motor is provided with an arrangement which includes a control means and an axially moveable member. By utilizing the control means for examp... | 06/26/1984 |
| 4428716 | Variable pitch propeller hub with fluid motor actuating means A variable pitch propeller hub with fluid motor actuating means wherein blading is controllably pitched and feathered by a hub having cylinder and piston means responsive to engine oil pressure and rotating the blades on their radial axes to a full pitch ... | 01/31/1984 |
| 4419050 | Method and apparatus for controlling propeller pitch A variable pitch propeller is controlled by a hydraulic mechanism responsive to forces urging an unsymmetrically mounted propeller towards its maximum pitch. Spring bias means maintains the propeller at minimum pitch under conditions of rest. The propelle... | 12/06/1983 |
| 4352634 | Wind turbine blade pitch control system Wind turbine blade pitch control system including hydraulic actuators which pivotally drive the blades about the longitudinal axis thereof to adjust the blade pitch. The actuators are supplied with hydraulic fluid from independent sources thereof for norm... | 10/05/1982 |
| 4097189 | Aircraft propeller and blade pitch control system A propeller hub supports a plurality of angularly disposed propeller blades which are movable by a hydraulic cylinder between a high pitch position and a reverse position through a low pitch position. Hydraulic fluid is supplied to the cylinder from a gov... | 06/27/1978 |
| 4037986 | Bladed rotors having control means for effecting blade pitch adjustment Control means, for effecting the pitch-adjustment of a rotor blade, includes an actuator urgeable by biassing means in one direction for adjusting pitch in one sense and being subjectable to fluid pressure for movement in the opposite direction, against t... | 07/26/1977 |
| 4019792 | Bearing assembly There is disclosed a bearing assembly comprising first and second bearing elements arranged in axially spaced relation about a shaft which oscillates about its axis through a relatively small angle, the bearing element which sees thrust loading from the s... | 04/26/1977 |
| 3976397 | Rotary actuators suitable for bladed rotors A rotary actuator, suitable for use with rotors having flow-varying blading, for effecting adjustment of the blading, including two relatively-rotatable and co-axially-disposed main actuator components. Each of the components carries a respective abutment... | 08/24/1976 |
| 3970410 | Rotary actuators suitable for bladed rotors A rotary actuator includes two relatively-rotatable main actuator components, abutment means being carried by the first component and displaceable axially with respect thereto, and further abutment means being carried by the second component. Holding mean... | 07/20/1976 |
