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| Number | Title | Issue Date |
| 7273355 | Compressor assembly with piston having multiple cross sections A compressor assembly having a piston with multiple cross sections. The compressor assembly, in one form thereof, includes a cylinder block defining a cavity. A piston is at least partially disposed in the cavity and reciprocates along a central axis of the cavity. ... | 09/25/2007 |
| 7104052 | Hydraulic cylinder with integrated accumulator A hydraulic cylinder assembly includes a hydraulic cylinder and an integral concentric accumulator. The hydraulic cylinder has a first piston surface for extending the cylinder, a second piston surface for retracting the cylinder and a third piston surface in dedica... | 09/12/2006 |
| 7055319 | Piston and cylinder assembly with volume compensating system A piston and cylinder assembly having a cylinder with a piston and a connected piston rod. The piston defines opposed chambers wherein a compensating device is disposed in at least one of the chambers. The compensating device includes a capsule of an elastic materia... | 06/06/2006 |
| 7048781 | Chemically-impregnated silicate agents for mercury control The present invention is directed to a contaminant removal agent comprising a polyvalent metal sulfide on the surface of an inert substrate. The substrate can be a layered silicate, such as vermiculite, an aluminosilicate such as montmorillonite, or a nonlayered sil... | 05/23/2006 |
| 6918247 | Assisted hydraulic system for moving a structural member A system is provided having a hydraulic circuit configured to move one structural member relative to another, and an assist cylinder connected between the structural members and configured to generate and retain potential energy when the one structural member moves ... | 07/19/2005 |
| 6907975 | Clutch, in particular for motor vehicle, with pneumatic control A clutch for a motor vehicle having an annular diaphragm (54) with a concave clutch characteristic curve and a pneumatic actuator (76) acting on the diaphragm (54) for clutch release. A mechanism (86, 88) is provided to generate a supplem... | 06/21/2005 |
| 6283011 | Cylinder with an elastic device for returning a working piston unit to a neutral position This cylinder, which may be entirely pneumatic, has two working pistons 26 and 27 linked to a working rod 28, slidably mounted on which are two small auxiliary pistons 37 and 38 which can be displaced in an auxiliary chamber 35. The latter, being permanen... | 09/04/2001 |
| 6279315 | Pneumatic unlocking and closing apparatus A pneumatic unlocking and closing apparatus for doors has a soft braking phase at each end position. The apparatus includes a pneumatic piston-cylinder unit having a working chamber acting on a large piston area and a return chamber acting on a piston are... | 08/28/2001 |
| 6085501 | Automatic adjusting for lightening a machine working unit: method, device and machine A method and device for automatically adjusting the lightening of a working unit (U) of a machine by use of a hydraulic ram (57) associated with a hydropneumatic accumulator (67). Use is made of a second hydraulic ram (58) of which the piston (53), which ... | 07/11/2000 |
| 6052992 | Heterogeneous structure for accumulating or dissipating energy, methods of using such a structure and associated devices The invention relates to a heterogeneous structure for energy accumulation-dissipation (10), the structure being constituted by a porous capillary solid matrix (11) of open capillary porosity and of controlled topology, with capillary passages (12) of var... | 04/25/2000 |
| 5904071 | Piston rod assembly A piston rod assembly has a release link connector (12) coupled to a power end component (10) and a fluid end component (11). The connector (12) allows quick release of the assembly and includes one or more tension links (15,20) which do not extend or pro... | 05/18/1999 |
| 5522221 | Active suspension system An actuator for use in an active suspension system is controlled by a valve responsive to differential pressure across the piston of the actuator. The valve operates to allow movement of the piston so as to reduce the pressure differential. The valve is a... | 06/04/1996 |
| 5375417 | Method of and means for driving a pneumatic engine A pneumatic motor having a plurality of cylinders, with each cylinder having an expansion chamber (15), defined in part by a piston plate (2); and a diversion chamber (16) which is divided into two chambers by a slide plate (11), with the diversion chambe... | 12/27/1994 |
| 5140894 | Gas spring actuator A gas spring actuator which, when attached to a valve, will return the valve to its initial position after the valve has been moved to a second position by application of a pressurized fluid that opposes the gas spring. The gas spring is charged to a pred... | 08/25/1992 |
| 5058538 | Hydraulically propelled phneumatically returned valve actuator An actuator which is used, for example, to operate an internal combustion engine poppet valve is configured to open the poppet valve by means of a high pressure hydraulic fluid. This fluid powers the actuator piston and, at the same time, compresses air t... | 10/22/1991 |
| 5044701 | Elastic body apparatus especially intended for an anti-lock brake system An elastic body apparatus includes a pneumatic pressure sealing member formed of a hollow flexible material and sealing therein a high pressure pneumatic gas, a movable member driven by an external force against the pressure of the pneumatic pressure seal... | 09/03/1991 |
| 4961316 | Controlled electric pump drive for hydraulic lifting arrangement with gas spring in motor A hydraulic lifting arrangement for a lift assembly on a materials-handling vehicle includes a working piston-cylinder device (17) for raising and lowering the lift assembly, a reversible pump assembly (40) for operating the piston-cylinder device, and an... | 10/09/1990 |
| 4955245 | Gas spring for actuator The invention relates to an actuator, comprising: a cylinder, one or two pistons reciprocally movable in that cylinder one or two racks, each carried by a piston, a pinion coupled to the rack(s), an output connecting part coupled to that pinion for connecting to a devic... | 09/11/1990 |
| 4872613 | Mastic adhesive fixture An assembly for applying a fluid on a workpiece from a fluid storage supply includes a fluid supply for supplying a fluid. An air supply supplies compressed air. An injector is connected to the fluid supply for receiving fluid from the fluid supply and fo... | 10/10/1989 |
| 4836757 | Pressure actuated movable head for a resonant reciprocating compressor balance chamber The present invention relates to a resonant piston compressor in which a double-sided piston reciprocates within a cylinder and defines a valved compression space on one side of the piston and a balance chamber on its other side. The invention further inc... | 06/06/1989 |
| 4784107 | Ball pitching system A ball pitching system comprising a pneumatically actuated pitching arm and automatic ball feed system. The pneumatic actuation is provided by an automatic pressure sensor valve. Compressed air is provided by a DC compressor affixed to the frame of the pi... | 11/15/1988 |
| 4777800 | Static head charged hydraulic accumulator A hydraulic accumulator for subsea use, which charges itself as it is lowered to the operating depth. The seawater and hydraulic fluid operate against unbalanced pistons (36, 52) with low pressure gas (42) therebetween.... | 10/18/1988 |
| 4759260 | Super reliable air-spring return air cylinder This invention relates to a fail-safe or auto-return actuator cylinder employing the air spring effect provided by compressed air trapped in an air-spring compartment; which air spring effect replaces the conventional mechanical coil spring employed in co... | 07/26/1988 |
| 4750870 | Pressure actuated movable head for a resonant reciprocating compressor balance chamber In a resonant piston compressor utilizing a balance chamber to provide a gas spring effect for use in a heat pump arrangement and the like, an adjustable balance cylinder head which adjusts so as to increase or decrease the balance chamber volume so as to... | 06/14/1988 |
| 4730743 | Hydraulically operated bridge crane A bridge-crane structure wherein major structural components to sustain loads imposed upon the span are also major functional components of hydraulically controlled hoist mechanism of the crane. Specifically, closed upper and lower elongate cylinders are ... | 03/15/1988 |
| 4729224 | Installation, apparatus and method for actuating doors, gates and the like under extreme environmental conditions An actuation installation for use under extreme environmental conditions, such as freezing, uses a two-fluid system in which one fluid is impervious to the extreme environment, and the other fluid, such as water, is not. A two-chamber accumulator-separato... | 03/08/1988 |
| 4681136 | Gas flow pulsation dampener and pressure differential control A device with use in combination with an expansible sleeve-type gas flow control valve in a production gas supply between a compressor and a delivery line provides pressure differential control as between the valve inlet and the valve outlet by relating h... | 07/21/1987 |
| 4644648 | Portable hydraulic tools A portable hydraulic tool, such as a hydraulic secateurs, is of the kind having a single acting ram including a driving piston with its piston rod connected to at least one movable operating member such as a cutting element of the tool, the piston being m... | 02/24/1987 |
| 4633665 | Double-action piston/cylinder unit A double action piston/cylinder unit has a piston guided in a cylinder and attached to a piston rod, the piston to be charged with a pressure agent, particularly hydraulic fluid at a first end face, the hydraulic fluid to be conducted in a controlled mann... | 01/06/1987 |
| 4628796 | Nitrogen die cylinder A nitrogen die piston-cylinder unit has a central post threaded at one end into a nitrogen manifold. The piston has an axial bore therethrough. A sleeve closed at one end is telescoped over the free end of the post and is vertically slideable thereon. The... | 12/16/1986 |
| 4613285 | Piston stroke control device for free piston type oscillating compressors In a free piston type oscillating compressor, closed spaces separate from gas springs are provided, and pressures of the closed spaces are regulated, whereby the amplitude, and central position of the stroke, of a free piston can be precisely controlled.... | 09/23/1986 |
| 4608913 | Actuator with pneumatic energy accumulator more especially for cock valves The present invention provides an actuator comprising a hydraulic cylinder whose rod is connected to the shaft driving the controlled device by means of a transmission. The end of the rod of the cylinder penetrates into an accumulation chamber connected t... | 09/02/1986 |
| 4602555 | Preloaded table coupling Table couplings for coupling hydraulic actuators to large shaking tables, such as earthquake simulator tables are preloaded under gaseous pressure to permit the couplings to be nontension carrying couplings, which in turn permits use of hydrostatic slip b... | 07/29/1986 |
| 4572489 | Nitrogen die cylinder A piston-cylinder unit for use in a die is threaded into a port of a nitrogen manifold. The piston has a seal thereon slideably engaging the cylinder bore and has a rod projecting out one end of the cylinder, the rod being biased by the gas pressure at th... | 02/25/1986 |
| 4563941 | Hydraulic actuator for control of valves The invention relates to a hydraulic actuator for the control of valves such as the kind found in ships. The actuator has a piston which is actuated in a valve opening direction with a hydraulic pressure medium and may be actuated in the return direction ... | 01/14/1986 |
| 4559863 | Valve for a hydraulic ram A spool valve for use in a hydraulic ram includes a piston journalled for axial movement within a cylinder under the influence of a fluid fed under pressure to the cylinder. The spool valve is journalled within a valve block closing an end of the cylinder... | 12/24/1985 |
| 4537221 | Hydraulic control devices for use with mining apparatus A compact hydraulic control device for use with mining apparatus is composed of a housing block containing tappet-operated valves. A multi-part cam shaft serves selectively to operate the valves by displacing the tappets by manual control effected by exte... | 08/27/1985 |
| 4516473 | Cylinder driving system A cylinder driving system comprising balance cylinders communicated to an accumlator for supporting a load under balanced state, a drive cylinder of a small diameter connected by way of a switching control device to an air source for driving the load with... | 05/14/1985 |
| 4508017 | Fluid-control system for a hydraulic percussion instrument A power cylinder of a hydraulic percussion implement, in whose bore a ram with an enlarged piston head is vertically reciprocable to strike a tool at the lower end of the bore, has a control chamber above the piston head alternately communicating with the... | 04/02/1985 |
| 4505242 | Control apparatus for internal combustion engines A control apparatus for internal combustion engines, which generates an adjustment path on the path of an adjustment member which is proportional to the air mass supplied to the engine. The control apparatus contains a counterpart pressure chamber sealed ... | 03/19/1985 |
