Quotables
"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6923405 | Enhanced rudder control system A reliably redundant PCU for an aircraft. The PCU includes an override mechanism coupled to the aircraft's control path and a first control member coupled to the override mechanism whereby the override mechanism attempts to transmit a command from the command path t... | 08/02/2005 |
| 6513548 | Control valves of a hydrostatic steering system Valves are associated and integrated inside a body C. A steering valve includes two cylinders A and B, concentric with the steering shaft D. The cylinder A rolls conjointly with the shaft. The valve controls the direction of the fluid circulation in the c... | 02/04/2003 |
| 6446538 | Arrangement for hydraulic actuation of a movable component on vehicles An arrangement for hydraulic actuation of a movable component on vehicles, particularly a vehicle top, trunk lid, a cover or the like, includes at least one double-action working cylinder (1) whose working chambers are connected to a pressure source (5) v... | 09/10/2002 |
| 6085634 | Power steering cylinder assembly This power steering cylinder assembly consists of a hydraulic cylinder which is closed at each end. A piston rod travels through the center of each end has a piston assembly fastened on it. The cylinder has holes in each end for fluid to enter and move th... | 07/11/2000 |
| 6058826 | Power steering cylinder assembly A power steering cylinder assembly including a cylinder divided by a piston into opposite chambers and a valve controlling flow between a pump, a tank and the chambers. Bypass passages selectively connects the opposite chambers when there is no flow from ... | 05/09/2000 |
| 5310315 | Low-vulnerability device for the control of helicopter rotor by cyclic plates The invention relates to a low-vulnerability device for the operation of a lifting and propulsing helicopter rotor by means of a cyclic plate mechanism, in which the non-rotating plate (5) is coupled at four points (1, 2, 3, 4) to four hydraulic actioning... | 05/10/1994 |
| 5048630 | Power steering trim control system A power steering trim control system for use with steering mechanisms provided in automotive vehicles. The trim system includes a flow distribution valve (38) which selectively directs fluid pressure to segregated groups (34, 36) of valve lands (32) of a ... | 09/17/1991 |
| 4995424 | Directional control valve A four way directional control valve comprises a valve body having a sleeve formed therein, a spool slidable in the sleeve, two output ports, a pump port and two tank ports formed in the valve body so that the output ports can be a pressure side and an ex... | 02/26/1991 |
| 4913191 | Directional control valve A four way directional control valve comprises a valve body having a sleeve formed therein, a spool slidable in the sleeve, two output ports, two pump ports and a tank port formed in the valve body so that the output ports can be a pressure side and an ex... | 04/03/1990 |
| 4616727 | Hydraulic steering force booster A device for the hydraulic boosting of steering force comprises a cylinder having a working piston which is coupled with a steering rod assembly. The cylinder includes working chambers into which hydraulic pressure can be introduced by way of multi-direct... | 10/14/1986 |
| 4601169 | Check device for a redundant flight control apparatus Check device for a redundant flight control apparatus comprising at least two servo drive devices. Failure in supplying fluid and wedging of a control valve (20) can be simulated. Failure of the bypass valve (35) can be checked by reading and comparing th... | 07/22/1986 |
| 4576198 | Servovalve with integrated failure monitoring An electrohydraulic servovalve which includes as an integral part thereof a monitor valve which senses the absence or lack of system pressure in the first or second stages of the valve and translates in the absence thereof to deactivate load control. The ... | 03/18/1986 |
| 4495854 | Power servo booster A power servo booster in which the diaphragms are freely pivotable from the power piston so as to prevent folding and collapse of the diaphragms in the non-powered state. A shell of the booster is divided into two volumes with a power piston and diaphragm... | 01/29/1985 |
| 4480527 | Power transmission A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions and a variable displacement pump with loading sensing co... | 11/06/1984 |
| 4471685 | System with sequenced activators Fluid introduced into an actuator moves the piston, against the force of a return spring, to extend the actuator. After the actuator has extended a sufficient amount to perform its intended function, the piston contacts and moves a sleeve type closure for... | 09/18/1984 |
| 4417640 | Electrically driven oil pressured power steering apparatus An electrically driven oil pressured power steering apparatus is disclosed herein. The apparatus comprises an oil pump driven by an electric motor for supplying a working oil to a power cylinder, a control valve for controlling the supply of the working o... | 11/29/1983 |
| 4354351 | Load sensing steering Fluid in the relatively long lines (22, 24) between a control valve (16) and a fluid actuator (14) can become overly viscous in cold weather. Herein, fluid is circulated through such lines (22, 24), at least during cold weather, even when the fluid actuat... | 10/19/1982 |
| 4341243 | Pressure reducing valve with floating stem for make-up vent A fluid control system for controlling a fluid motor (12) wherein a pressure regulating pilot valve (10) controls a directional control valve (11) by manipulation of handle (21) associated with the pilot valve (10). The directional control valve (11) incl... | 07/27/1982 |
| 4337689 | Safety system for a double acting servomotor The safety system employs a shut-off valve, a control valve and a selector. The selector is formed of two non-return valves which are connected to the two chambers of the servomotor and has an output connected to one chamber of the control valve. Another ... | 07/06/1982 |
| 4320691 | Hydraulic load lifting system with hydraulic surcharge to make up valve pilot lines A hydraulic system (9) includes a hydraulic motor (10), a main control valve (17) for controlling said motor (10), a make-up valve (78,79) operatively associated with said main control valve (17) and a vent line (93,94,95,99) for selectively venting said ... | 03/23/1982 |
| 4314502 | Safety control system for double-acting cylinder In combination with a double-acting cylinder having pressure and exhaust ports, a cylinder control valve having a spool having a pair of control positions with pressure, cylinder and exhaust ports, and conduits between the valve cylinder ports and cylinde... | 02/09/1982 |
| 4265087 | Hydraulic motor seal and valve arrangement The hydraulic brake booster power piston has a rectangular cross section seal groove containing a rectangular cross section lathe cut seal having a greater inner diameter than the groove as well as a greater outer diameter. Radial clearance is provided be... | 05/05/1981 |
| 4257311 | Control systems A hydraulic control system has two fluid supply circuits which control fluid pressure supplied to respective chambers of a fluid-controlled actuator, each chamber having an individual piston mounted on a common actuator rod. In normal operation, a major p... | 03/24/1981 |
| 4220073 | Control valve for working machines A control valve adapted for use in working machines for hydraulically controlling the lifting movements of the working machine such as a rotary blade or plow connected to a power machine, said control valve comprising essentially a change-over valve for c... | 09/02/1980 |
| 4208879 | Injection molding machines In an injection molding machine of the type comprising an injection cylinder, a feedback circuit for feeding back the oil in the rear chamber of the injection cylinder into the front chamber thereof and a booster cylinder, a pressure oil accumulator is co... | 06/24/1980 |
| 4206605 | Installation for the power assist of actuating devices in motor vehicles, especially in a hydraulic brake system An installation for the servo-assist of actuating devices in motor vehicles, especially of a hydraulic brake system, in which a control member, such as the brake pedal, acts on an actuating device, such as a master cylinder of a two-circuit brake system b... | 06/10/1980 |
| 4147325 | Hydraulic control assembly A hydraulic control assembly especially suited for operation of a fail-safe valve. An integral structure is provided having a pair of check valves disposed in passageways extending from one chamber of a piston operator to a hydraulic reservoir and the oth... | 04/03/1979 |
| 4128380 | Fluid pressure actuated drive for the closing unit of an injection moulding machine A fluid pressure actuated drive for providing for the closing unit of an injection moulding machine a to and fro traversing motion of a movable part of the unit with little force and a clamping of the closed unit with a greater force. The device has at le... | 12/05/1978 |
| 4034815 | Blade lift float circuit for motor graders A construction vehicle, such as a motor grader, comprises a work tool mounted thereon and adapted to be selectively moved by at least one double-acting hydraulic cylinder. A fluid circuit comprises a pressurized fluid source adapted to communicate fluid t... | 07/12/1977 |
| 3971296 | Pneumatic actuators A pneumatic actuator having a double-acting piston separating two pressure chambers, spring means to urge the piston in one direction; and valve means adapted to admit compressed air to one of the chambers and thus to load the spring means, then to transf... | 07/27/1976 |
| 3943825 | Hydraulic control system for load supporting hydraulic motors A load supporting hydraulic system having a pilot operated main control valve is provided with pilot controlled load check valve operative to permit free flow of fluid from said control valve toward the load supporting means of the system in response to p... | 03/16/1976 |
| 3939757 | Fluid power steering system with valve operator control means The steering wheel controlled valve operator in a fluid power steering system, is mechanically held in a neutral position by centering springs associated with fluid pressure controlled reaction pistons yieldably resisting movement of the control valve by ... | 02/24/1976 |
| 3935792 | Pilot pump bleed control for earthmoving scrapers In an earthmoving scraper a low volume, low pressure, pilot pump supplies fluid pressure to a pilot control valve which routes this fluid through bleed lines to a remote scraper control valve that operates the bowl jacks on the scraper from a separate sou... | 02/03/1976 |
