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| Number | Title | Issue Date |
| 7246491 | Actuator An actuator includes a hollow cylinder which has a first portion and a second portion. The inner diameter of the first portion is larger than that of the second portion. A piston is inserted in the cylinder. The actuator has a gas generator which supplies a gas into... | 07/24/2007 |
| 6968685 | Hydraulic drive A hydraulic drive (1) has a position selection device (2) in communication with a control valve (3) which, as a function of the actuation of the position selection device (2), controls the connection of an actuating cylinder (8) wi... | 11/29/2005 |
| 6932166 | Pneumatic tool A pneumatic tool (20) for impacting a workpiece (22) is provided. The tool (20) comprises a casing (42) defining a chamber (48). A piston (54) is slidable within the chamber (48) along an operational axis (A). An exha... | 08/23/2005 |
| 6685139 | Emergency opening cylinder of a passenger door for an airplane, a door system and a method of modifying a door system An emergency opening cylinder of a passenger door of an airplane is provided. An existing emergency opening cylinder is adapted at the lowest expenditures and with an insignificant increase in weight with respect to its operating characteristic to the loa... | 02/03/2004 |
| 6672399 | Hydraulic diverting system for utility vehicle A hydraulic fluid diverting arrangement for a utility vehicle provides additional pressurized hydraulic fluid supply to an installed backhoe attachment by diverting hydraulic fluid from the unused rockshaft or three-point hitch of the utility vehicle. A s... | 01/06/2004 |
| 6431048 | Combination actuator with speed variable mechanism An output shaft is connected to a piston rod of a fluid pressure-driven linear cylinder through a converting mechanism for converting linear thrust of the piston rod into rotational torque and converting operation of the converting mechanism is controlled... | 08/13/2002 |
| 6273690 | Downhole pump with bypass around plunger The downhole pump has a barrel with a reciprocating plunger therein. The barrel has a first one-way valve, while the plunger has a second one-way valve. A barrel chamber is formed between the two one-way valves. The barrel chamber expands when the recipro... | 08/14/2001 |
| 5323686 | Tube jetting apparatus A valve system for use with a tube jetting apparatus used for cleaning the interior surfaces of tubes such as those in heat exchangers. The apparatus includes a piston housing having a piston assembly slidably disposed therein. The pressure relief assembl... | 06/28/1994 |
| 5217245 | Switchable roll-stabilizer bar Vehicle suspension apparatus operating between the sprung and unsprung masses of a vehicle includes a pendular anti-roll bar connected to the vehicle, and a pair of links which connect the bar to the wheels. One and the other link, respectively, is extens... | 06/08/1993 |
| 5110251 | Hydraulic platform lift for truck trailers A hydraulic platform lift for use on trucks and truck trailers has two hydraulic cylinders, one on each side of a door. The cylinders are phasing cylinders in that one cylinder is larger than the other cylinder by a specific ratio. The cross-sectional are... | 05/05/1992 |
| 5032063 | Precision fluid pump Hydraulic fluid is replenished in a pulsator chamber of a fluid driven pulsator pump by having the power plunger in an upstanding bore with spaced seals. The power plunger is withdrawn upon each stroke vertically upward. As it is withdrawn past seals, any... | 07/16/1991 |
| 5016723 | Hydraulic power steering apparatus The hydraulic power steering apparatus of the present invention has plungers being installed movably at part of a casing of a hydraulic control valve and a reaction chamber being formed at one side of the plungers, and varies hydraulic pressure to be supp... | 05/21/1991 |
| 4910961 | Hydraulic door opening or closing device A hydraulic door opening or closing device comprises a hydraulic fluid pump motor having two ports connected to each end of integral dual manifold and operating cylinder apparatus by way of two branch fluid lines. One branch line is fluidly connected to a... | 03/27/1990 |
| 4885978 | Fluid-operated miniature engine Miniature engine operated by an expanding gaseous fluid, which comprises a cylinder (18), piston (20) and inlet valve (29), the upper part of the piston (20) cooperating with a radially expansible resilient diaphragm (28), which is secured to the piston (... | 12/12/1989 |
| 4766802 | Small-sized engine operated by fluid Small-sized engine operated by an expanding gaseous fluid, which comprises a cylinder (18), a piston (20) and an inlet valve (38), the upper parts of the cylinder (18) and the piston (20) cooperating momentarily with a perforated (29) resilient membrane (... | 08/30/1988 |
| 4767255 | Backhoe boom cylinder bleed circuit A bleed circuit for a backhoe boom cylinder which minimizes cylinder pressure during over-center movement of the boom while permitting the maintenance of sufficient cylinder pressure during other boom operations. The boom cylinder is provided with a retra... | 08/30/1988 |
| 4730540 | Cylinder for a two cycle engine The cylinder for a two cycle engine includes at least a port opened and closed by a piston in the cylinder the port being divided into a plurality of port portions by a rib extending longitudinally of the cylinder. The inner surface of the cylinder is for... | 03/15/1988 |
| 4718325 | Hydraulic swing control for boom assembly An improved mechanism is provided for controlling the relative pivoting movement of two members about a main pivot axis as effected by two hydraulic motors. Each hydraulic motor is a double-acting piston-cylinder type that is fully extended when its respe... | 01/12/1988 |
| 4709912 | Apparatus for separating and conveying sheet-like articles In order to accomplish the separation and further conveyance of the uppert sheet of a stack of sheets by the simplest possible means, an elastic friction finger resting with slight pressure on the uppermost sheet of the stack is provided, which is set in... | 12/01/1987 |
| 4471938 | Modulating poppet valve A poppet valve movable to discrete opened positions by metering fluid through axially spaced orifices in a cylinder by a piston directly connected to the poppet. The flow of fluid through the orifice is interrupted to cause the piston to translate to the ... | 09/18/1984 |
| 4469010 | Motion dampening seat suspension system A system for resiliently supporting a load at a reference height includes a hydraulic cylinder for resiliently supporting a load about a reference height and an accumulator which cooperates with the cylinder for flowing hydraulic fluid therebetween in res... | 09/04/1984 |
| 4463563 | Rephasing cylinder construction An improved rephasing master cylinder in which the cylinder wall approximate the end of the cylinder has a longitudinal bleed passage in the cylinder wall at one end connected to a lateral passage opening into the forward cylinder chamber while the opposi... | 08/07/1984 |
| 4436491 | Method of supplying hydraulic operating fluid in diaphragm type In a diaphragm type pump, a minute amount of the operating fluid is supplied instantaneously from an oil reservoir to an operating chamber at the final stage of the suction stroke in a main cylinder, and an excessive amount of the operating fluid and/or b... | 03/13/1984 |
| 4417598 | Pneumatic valve A pneumatic valve system for sealing off the flow of a liquid at the intersection of two pipes, one of the pipes being vertically disposed with respect to the other pipe. A sensing probe senses liquid at a pre-established height in the vertically disposed... | 11/29/1983 |
| 4401011 | Method to adjust and/or indicate a liquid or gaseous pressure, and a device for utilization of the method A method for adjustment and/or indication of a liquid or gaseous pressure, and advice for utilization of the method, including the use of a piston member (7, 7'), movably arranged in a surrounding housing (1), said member having two towards each other act... | 08/30/1983 |
| 4376527 | Device for tensioning a reinforcing strand A device for tensioning reinforcing strands in concrete structures comprises a cylinder and a cooperating piston and is provided with means for supplying a pressure gas obtained by the combustion of powder or some similar compound. The device may be arran... | 03/15/1983 |
| 4333492 | Liquid inertia tool Disclosed is a liquid inertia tool in which the kinetic energy of flowing liquid is converted to useful work by decelerating the liquid flow and directing the inertia force in the water against a movable element in the liquid flow-containing structure whi... | 06/08/1982 |
| 4323002 | Hydraulic equipment A hydraulically actuable piston and cylinder unit comprising a hollow piston rod, slidably housing, at least partially, an elongate extension piece having a circular outer periphery, means to connect mechanically, the extension piece to the piston rod at ... | 04/06/1982 |
| 4275641 | Hydraulic servo cylinder and piston A servo cylinder having a piston of the kind having spaced sections which move into an enlarged diameter low pressure bore portion of the cylinder is provided with a gasket assembly for each piston section in the form of an elastic sealing gasket having a... | 06/30/1981 |
| 4274327 | Expansible chamber device An internal combustion engine, a fluid motor or a pump includes a cylinder block enclosing an elongated cylindrical bore. A double headed piston is slidably mounted within the bore. The piston and cylinder block are rotatable relative to each other about ... | 06/23/1981 |
| 4252261 | Pneumatic fastener driving tool A pneumatic driving system for causing a nail or the like to run out of the barrel of a nailing tool to where its point may be seen by the user for lining up with a hole on the work and subsequently driving the nail into the workpiece.... | 02/24/1981 |
| 4188858 | Bumper deterioration warning system for fastener driving tools A warning system for pneumatic fastener driving tools that acceptable bumper deterioration has been exceeded thereby to warn against further use of a tool prior to replacement of the bumper. A piston carrying a driver blade moves from an upper position of... | 02/19/1980 |
| 4168655 | Power output control system for vapor engine A vapor engine including a cylinder in which a piston reciprocates and having an inlet valve in the cylinder head which is driven from its seat by the piston as it approaches the cylinder head. The time at which the valve is driven from its seat does not ... | 09/25/1979 |
| 4152971 | Fluidic repeater Two fluid passages are connected through flow restrictors to a fluid supply. Downstream of the restrictors the fluid supply has a drooping pressure-load characteristic. Venting means for the fluid passages comprises vent openings therein downstream of the... | 05/08/1979 |
| 4140044 | Long stroke, large bore, low friction hydraulic actuators A large bore, long stroke, low friction, hydraulic actuator having dual hydrostatic bearings permitting elastic deformation of the piston rod while inhibiting metal to metal contact between either the piston head or the deformed piston rod and the walls o... | 02/20/1979 |
| 4137825 | Fluidic repeater Two fluid passages are connected through flow restrictors to a fluid supply. Downstream of the restrictors the fluid supply has a drooping pressure-load characteristic. Venting means for the fluid passages comprises vent openings therein downstream of the... | 02/06/1979 |
| 4136520 | Hydraulic pile driver A hydraulic pile driver of the kind having at least one hydraulic cylinder for raising a tup. An arrangement is proposed for allowing the use of oil as the hydraulic fluid. The cylinder has a closed chamber around it, to which oil under pressure is suppli... | 01/30/1979 |
| 4077608 | Hydraulic hand jack A hydraulic jack is disclosed, of the type comprising a ram having a head portion reciprocable in a cylinder between two cylinder ends, and sealing means carried on the ram head portion to provide a substantially fluid-tight seal between the ram and the c... | 03/07/1978 |
| 4075931 | Lift-jack fluid motor for hydraulic lift trucks An expanding chamber hydraulic motor venting through a working member reduces the motor/stroke-limiting venting valve assembly to three simple components: a cup-shaped cylinder, an annular gasket at the open end of the cylinder, and undersize piston suffi... | 02/28/1978 |
| 4057109 | Tractor with hydraulic draft control The lower draft link of a tractor three-point hitch includes a sensor to sense draft loads imposed on the draft link by an earth-working implement. Variations in the draft load cause variations in the pressure of the fluid in the sensor from a preselected... | 11/08/1977 |
