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| Number | Title | Issue Date |
| 5092178 | Differential pressure sensor mechanisms Differential pressure sensor mechanisms include core members acted upon by pressure sensing plungers at opposite ends of the core members to cause axial movement of the core members relative to a linear variable position sensor when unequal force balances... | 03/03/1992 |
| 5012144 | Linear direct drive motor Linear direct drive motor includes a pair of axially spaced, relatively fixed stator poles and an armature mounted on a motor shaft for axial movement between the stator poles. The ends of the motor shaft are supported by centering springs which permit ax... | 04/30/1991 |
| 5004940 | Direct drive valve force motor with gain shaping provision Limited angle torque motor includes a secondary magnetic flux path of relatively small cross-sectional area which increases the rotational and torque gains of the motor in a localized area about the motor null as if the magnetic air gap of the motor were ... | 04/02/1991 |
| 4884493 | Fluid actuator including a ballistically tolerant rod gland bearing Fluid actuator includes shear pins or threaded fasteners between a rod gland and a rod gland bearing which cause the rod gland bearing to separate from the rod gland in response to a predetermined jam clearance force being applied to the rod gland bearing... | 12/05/1989 |
| 4872370 | Piston rod assembly including preloaded piston head and composite rod Piston rod assembly includes a composite piston rod having an entrapment ridge along the length thereof, and a non-integral metallic piston head having two separate piston head sections which are welded together in preloaded engagement against opposite si... | 10/10/1989 |
| 4843949 | Fluid control valve with variable pressure gain Actuator control system includes two parallel connected orifices between a pair of fluid passages providing communication between an actuator and a flow control valve. Relief valves in series with the respective orifices block fluid flow through the orifi... | 07/04/1989 |
| 4841844 | Fluid actuators with LVDT feedback mechanisms A fluid actuator characterized by a linear variable differential transformer (LVDT) feedback mechanism driven off the actuator screw shaft for indicating actuator position. A protective clutch mechanism prevents possible damage to the LVDT or actuator in ... | 06/27/1989 |
| 4838104 | Center mounted and center drive helical spline actuator Helical spline actuator includes a pair of cylinder housings connected together in end-to-end spaced apart aligned relationship by means of a center mount. A shaft is mounted for rotation within the two housings, and has a rotatable drive member extending... | 06/13/1989 |
| 4825904 | Two position flow control valve assembly with position sensing A flow control valve assembly including a valve having open and closed positions and a limited angle torque motor having two angular rotor positions corresponding to the open and closed valve positions that are stable in the absence of an applied electric... | 05/02/1989 |
| 4816707 | Limited angle torque motor with wide rotation poles Limited angle torque motor includes a rotor assembly having one or more permanent magnets which are magnetized in the diametrical direction and a stator assembly including a pair of circumferentially spaced stator magnetic pole pieces, each having a stato... | 03/28/1989 |
| 4809742 | Control valve assembly including valve position sensor An electromechanical valve assembly incorporates an electromechanical actuator, such as a limited angle torque motor or solenoid, to open or close the valve in response to a direct current or low frequency electrical signal. A valve position sensor detect... | 03/07/1989 |
| 4802404 | Composite cylinder assembly with removable liner assembly Composite cylinder assembly includes a removable liner assembly consisting of a liner member having circumferential hoop stress windings wrapped thereabout. The ends of the liner assembly freely float on cylindrical end portions on the inner ends of end g... | 02/07/1989 |
| 4787486 | Landing gear mechanism including controlled instroke and rebound damping and stroke overload protection Landing gear mechanism includes a variable area orifice to obtain the desired rebound damping of the landing gear mechanism during landing, and one or more check valve assemblies that operate in conjunction with the variable area orifice to provide the de... | 11/29/1988 |
| 4777869 | Fluid actuator including a composite piston rod Fluid actuator includes a piston rod comprised of a wound filamentary composite structure to provide an extremely light weight, relatively low cost, envelope efficient design. Attached to the piston rod are one or more non-integral piston heads which are ... | 10/18/1988 |
| 4773282 | Piston rod assembly including an injection bonded piston head and fabrication method Piston rod assembly includes a piston head and rod which are formed separately and subsequently jointed together by injecting adhesive through a porting passage in the piston head into an annular space formed by an internal groove in the piston head and a... | 09/27/1988 |
| 4773306 | Dual tandem composite cylinder assembly including separately formed cylinder barrels A dual tandem composite cylinder composite cylinder assembly including a pair of composite cylinder barrels in series, and a center dam connection between adjacent ends of the cylinder barrels formed by providing an interference between external ramps on ... | 09/27/1988 |
| 4754694 | Fluid actuator with lock position indicating means A fluid actuator includes a lock mechanism for releasably locking the actuator against movement, and a lock release lever engageable by a lock piston upon application of system pressure thereto to release the lock mechanism. The lock mechanism includes an... | 07/05/1988 |
| 4746086 | Nose landing gear jump strut assembly Nose landing gear jump strut assembly includes an outer main housing cylinder containing a jump cylinder which is normally retained in a retracted position but is extendable on command during the take-off ground roll of the aircraft to accelerate the oute... | 05/24/1988 |
| 4745847 | Helical splined rotary actuator Helical splined rotary actuator includes a pair of cylinder housings having inboard ends rotatably mounted in coaxial alignment on opposite ends of a center sleeve member. Contained within the housings are pistons having relatively large diameter helical ... | 05/24/1988 |
| 4729529 | Landing gear mechanism including bypass valve assembly for reducing damping loads during taxiing Landing gear mechanism includes a restrictor assembly containing a main orifice for controlling the rate of instroke of the landing gear mechanism during landing and a taxi instroke bypass valve which provides for increased flow of hydraulic fluid within ... | 03/08/1988 |
| 4717035 | End closure for composite pressure vessels A composite pressure vessel includes retaining rings at opposite ends of a side wall structure having circumferentially spaced oppositely facing tabs thereon about which longitudinal tension windings are progressively wrapped back and forth in a continuou... | 01/05/1988 |
| 4714006 | Fluid actuator with feedback mechanism A fluid actuator characterized by a feedback mechanism for indicating actuator position. The feedback mechanism is driven by the actuator screw shaft, whereby the movements of the feedback mechanism are proportional to the rate and position of the actuato... | 12/22/1987 |
| 4700868 | Composite pressure vessel including fluid port with replaceable seal in composite sidewall structure and method of constructing such fluid port A composite pressure vessel including a fluid port extending through the composite sidewall structure formed by providing a radial hole through the sidewall structure for receipt of an externally removable porting plug. The porting plug is retained within... | 10/20/1987 |
| 4697499 | Dual tandem composite cylinder assembly Dual tandem composite cylinder assembly includes a cylinder having circumferential or hoop stress windings surrounding a pair of hydraulic chambers in series to react the circumferential loads and prevent diametrical expansion of the hydraulic chambers. L... | 10/06/1987 |
| 4685384 | Fluid actuator including composite cylinder assembly Fluid actuator includes a composite cylinder having circumferential hoop stress windings wrapped about a liner member forming the piston chamber wall, and longitudinal tension windings extending from the outboard end of the cylinder along one side thereof... | 08/11/1987 |
| 4685589 | Composite pressure vessel including a fluid port directly through the composite side wall structure A composite pressure vessel including a fluid port directly through the composite side wall structure formed by internally locating a porting fitting in the side wall structure and then inserting a liner member in the interior of the side wall structure. ... | 08/11/1987 |
| 4684284 | Anti-rotation lock assembly Anti-rotation lock asembly includes a male threaded member that may be releasably locked in any desired axially adjusted position relative to a mating female threaded member by means of one or more wedge keys that are forced axially into notches in an end... | 08/04/1987 |
| 4684280 | Clevis connection Clevis connection includes a clevis bushing having a bushing sleeve, with a shoulder at one end having a tapered inner diameter, and a longitudinally extending slot through the shoulder and a portion of the length of the bushing sleeve. The bushing is ins... | 08/04/1987 |
| 4672992 | Direct drive valve-ball drive mechanism Ball drive mechanism includes a ball-like member on an eccentric output shaft of a rotary force motor which is received in a transversely extending cylindrical socket on a valve member. The outer diameter of the ball-like member is substantially the same ... | 06/16/1987 |
| 4646786 | Fluid control valves with angled metering ports Flow control valve includes angled metering ports in the valve sleeve for directing the momentum of the fluid flow against the respective valve flow metering edges in a direction producing an opening reaction force on the valve upon initial valve opening ... | 03/03/1987 |
| 4645178 | Redundant drive mechanisms for a direct drive valve and force motor assembly Multiple drive paths are provided between the valve plunger and force motor of a direct drive valve and force motor assembly whereby should one of the drive paths fail, the force motor can still be used to drive the valve plunger through another drive pat... | 02/24/1987 |
| 4641812 | Direct drive valve and force motor assembly including interchangeable stator assembly and alignment system or method A direct drive valve and force motor assembly including interchangeable stator assembly and method for accurately setting the magnetic spring null of the motor with respect to the servo valve hydraulic null independent of the actual motor stator assembly,... | 02/10/1987 |
| 4627467 | Pilot operated directional control valve Directional control valve includes a manually operated pilot valve stage and a hydraulically operated power valve stage to isolate the pilot valve stage from the effects of the high axial flows passing through the power valve stage. The pilot valve is spr... | 12/09/1986 |
| 4619288 | Adjustable transducer and lock mechanism for monitoring valve position A lost-motion connection is provided between the armature core of a valve position sensor and the valve plunger preventing relative rotation therebetween while permitting relative axial movement by rotation of an adjuster sleeve having threaded engagement... | 10/28/1986 |
| 4612526 | Torque motor with high torque poles and magnetic centering spring adjustment A two-pole limited angle torque motor including a rotor assembly having one or more permanent rotor magnets and a stator assembly including a stator coil and a pair of circumferentially spaced stator pole structures. Each pole structure includes a general... | 09/16/1986 |
| 4600910 | Limited angle torque motor with high torque output multiple coils and increased magnetic centering torque Limited angle torque motor includes a rotor assembly having one or more permanent magnets which are magnetized in the diametrical direction and a stator assembly having a plurality of axially spaced pairs of stator pole pieces, each pair having a stator c... | 07/15/1986 |
| 4596970 | Limited angle torque motor with high stiffness and natural frequency Limited angle torque motor includes a motor power section comprising a rotor assembly having one or more permanent rotor magnets which are magnetized in a diametrical direction and a stator assembly surrounding the rotor assembly. The magnetic flux in the... | 06/24/1986 |
| 4595159 | Landing gear mechanism including runway-roughness restrictor assembly Landing gear mechanism includes a restrictor assembly containing a primary orifice for controlling the rate of instroke of the gear during landing and a taxi instroke bypass valve which provides for increased flow of hydraulic fluid within the gear whenev... | 06/17/1986 |
| 4573494 | Spherical ball drive mechanism for a direct drive valve Spherical ball drive mechanism for directly coupling a rotary force motor to a valve member, includes a spherical bearing assembly at one end of the valve member. The spherical bearing assembly consists of an outer race member having a concave spherical i... | 03/04/1986 |
| 4555974 | Servo actuator control/damping mechanism and method A fluid servo actuator control/damping mechanism and method which utilize and combine the functions of an electro-mechanically driven servo valve to achieve ram or actuator fluid flow and load control even after loss of fluid power as well as the main ram... | 12/03/1985 |
