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| Number | Title | Issue Date |
| 7373777 | Die drive unit of molding machine A die drive unit has a cylinder mechanism which hydraulically drives a piston member and an additional drive mechanism which drives the piston member by means of a drive source other than a hydraulic one. A first oil chamber is formed on one side of the piston membe... | 05/20/2008 |
| 7264059 | Method and device for pressure controlled sequential operation A method and a device for controlling a downhole hydraulic sequential control system (1) in which a number of pressure relief valves (20, 22) are arranged to open sequentially directly or indirectly for corresponding actuators (26, 34) through i... | 09/04/2007 |
| 7137792 | Piston pump for high viscous materials In a piston pump (1) having a differential piston (12) positioned in a cylindrical housing (11) and translationally drivable, a first pressure chamber (13) of the differential piston (12) is connectable to a second pressure chamber... | 11/21/2006 |
| 6832900 | Piston mounting and balancing system A compact 180° opposed piston pump/compressor minimizes axial spacing between its pistons on the drive shaft and thereby reduces the shaking couple and noise from reciprocation. Each piston has its own eccentric element press-fit into the connecting rods so as not ... | 12/21/2004 |
| 6769350 | Linear path slide This invention relates to a linear path slide (10) with a slide (26) which is arranged slidingly movable in a housing (12) along a sliding guide (20) and safe against torsion and with a hydraulic driving gear (40) integrated into t... | 08/03/2004 |
| 6763920 | Self-contained bidirectional end-of-stroke hydraulic snubber A bidirectional self-contained end-of stroke snubbing device (20) includes a housing (21), a rod (22) movable relative to the housing, a single fluid-filled variable-volume chamber (23) communicating with a fluid sump (24) through ... | 07/20/2004 |
| 6349679 | Circularly-curved piston engine This engine is substantially free from any vibration and noise, small in friction loss, improved in mechanical efficiency to a considerable extent, compact and lightweight, and applicable to a reciprocating piston engine. The engine comprises: curved cyli... | 02/26/2002 |
| 6073886 | Constant pressure area telescoping piston and method of using same An actuator assembly that has a constant net pressure area telescoping piston. The actuator assembly has a cylindrical housing; nesting, telescoping pistons; a central plug; an outer cap; and a vent. The cylindrical housing has an interior surface and a b... | 06/13/2000 |
| 5839350 | Means and method for preparing a container for recycling A press assembly includes a hydraulic cylinder assembly having first and second chambers and respective piston and rod assemblies therein. The rod of the second assembly is arranged to enter the first chamber and thereby raise the pressure therein. Initia... | 11/24/1998 |
| 5819533 | Hydraulic-pneumatic motor A hydraulic motor has three interconnected power pistons. The pistons include passageways therebetween that allow a working fluid to be conserved upon reciprocating piston motion. Valves control the pressure state of working fluid within working chambers,... | 10/13/1998 |
| 5806405 | Hydraulic servo device for a friction brake in a planetary transmission An hydraulic servo device for a friction brake in a planetary transmission for motor vehicles contains a cylinder with stepped interior wall, a stationary dividing wall that has a hole and divides the interior of the cylinder into two regions, one piston ... | 09/15/1998 |
| 5533435 | Fluid cylinder assembly A first cylinder of a smaller diameter and a second cylinder of a larger diameter are connected in a coaxially intercommunicating state. A first piston of a smaller diameter which is hermetically slidable within the first cylinder is mounted on a rod whic... | 07/09/1996 |
| 5447030 | Vehicle brake booster A brake booster mounting including a support to which the booster is securable by means of at least one mounting bolt, and a captive nut located on a side of the support opposite to that to which the booster is to be attached and which is engageable by th... | 09/05/1995 |
| 5191825 | Low-impact air cylinder A low-impact drive unit operates by air under pressure. It includes aligned working and pressure chambers. The working chamber contains a working piston and a working piston rod extending from an end of the chamber. The pressure chamber contains a rear ou... | 03/09/1993 |
| 5044255 | Brake regulator with second boost chamber The vacuum servomotor comprises a main casing (12) divided sealingly on the inside into first and second chambers (10, 20) by a flexible membrane (9) bearing on a rigid disk (7) integral with an activating piston (3). The first chamber (10) is subjected t... | 09/03/1991 |
| 4776562 | Dual piston pneumatically operated valve A gas cylinder valve for high pressure gas cylinders includes a pneumatic actuator with tandem pistons which are operated by normal industry "house" pneumatic pressures to overcome the large closing bias force generated by a set of disc springs so that th... | 10/11/1988 |
| 4759265 | Piston and cylinder unit The invention provides a piston and cylinder unit whose piston rod is sealed by a supporting and sealing arrangement arranged in an end cap of the unit. This supporting and sealing arrangement comprises a sealing portion made integrally with a stripper po... | 07/26/1988 |
| 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 |
| 4748899 | Dual-pressure jack The casing of the jack is divided into two cylinders by a cross partition, with a first piston which moves in one of the cylinders and a second piston, forming two parts, linked by a rod which crosses the partition to its first part which moves in the fir... | 06/07/1988 |
| 4729291 | Gas compressor The Compressor is small, compact and lightweight in that it is formed of the barest essentials. It has a pair of in-line cylinders, with pistons reciprocatable therein, and the crankshaft, having only one crank, is drivingly coupled to one of the pistons.... | 03/08/1988 |
| 4691902 | Self-lubricating die cylinder A self-lubricating die cylinder assembly is provided containing a cylinder, piston, expansion reservoir and working chamber. A lubricating oil recirculation means is provided to transport oil between the working chamber and the expansion reservoir during ... | 09/08/1987 |
| 4667473 | Low compensating accumulator and bungee In an actuator (102), a piston head portion (108) reciprocates in a large diameter section of a cylinder casing (102), dividing such section into first and second variable volume chambers (112, 116). An end portion (104) projects outwardly of the cylinder... | 05/26/1987 |
| 4602481 | Fluid actuator for binary selection of output force The actuator (12) comprises three main parts, an outer casing (20), a movable piston (28) and a fixed piston (36). A stepped outer portion (50, 52, 54) of the movable piston (28) cooperates with a stepped cavity (40, 42, 44) in the casing (20) to define a... | 07/29/1986 |
| 4601233 | Hydraulic servo device with built-in accumulator A hydraulic servo device with a built-in accumulator, comprising a servo piston fit in a servo cylinder and connected via a stem to a band brake, an accumulator piston having a large diameter outer diameter portion and a small diameter outer diameter port... | 07/22/1986 |
| 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 |
| 4527465 | Cylinder apparatus for rack and pinion type power steering mechanism of motor vehicle In a cylinder apparatus for a rack and pinion type power steering mechanism of a motor vehicle or the like, including two pressure chambers defined in a power cylinder, there is provided means for making the effective pressure-applied areas of the two pre... | 07/09/1985 |
| 4467833 | Control valve and electrical and hydraulic control system A control valve and a multiple control system therefor for controlling a plurality of remotely positioned hydraulically actuated underwater devices. The control valve includes first and second equal size pilot pistons acted upon by first and second pilot ... | 08/28/1984 |
| 4464145 | Belt type stepless shifter In a belt type stepless shifter, movable flanges of pulleys are driven by hydraulic cylinders, and each of the cylinders is provided with a plurality of pressure carrying surfaces disposed in the axial direction, thereby a great amount of torque can be tr... | 08/07/1984 |
| 4429620 | Hydraulically operated actuator A hydraulically operated actuator employs multiple metal-to-metal static seals to isolate the hydraulic fluid and to isolate the actuator from surrounding contaminating (ambient) fluids. A housing contains at least two linearly spaced apart chambers. A pi... | 02/07/1984 |
| 4316597 | Compact valve actuator A compact valve actuator for operating a valve of the butterfly type or the like. The actuator comprises a pair of joined pistons which respond by simultaneous reciprocation to introduction of operating fluid such as air into the actuator. Means such as a... | 02/23/1982 |
| 4248046 | Vent accumulator for hydraulic integrator A vent accumulator for a hydraulic integrator of the type having at least three pistons arranged in end-to-end relationship within an elongated housing. Each piston is adapted to move under hydraulic pressure in a direction away from one longitudinal end ... | 02/03/1981 |
| 4226167 | Air-spring return air cylinder The use of the air-spring in automatically retracting (or extending) an air cylinder after it was extended (or retracted) by the air pressure supplied from the compressed air line is disclosed.... | 10/07/1980 |
| 4201053 | Telescopic cylinder automatic synchronizer A telescoping hydraulic cylinder apparatus for elevator application, wherein telescoping cylinders and a piston rod extend or retract simultaneously, having a compensator pump for automatically replenishing fluid lost due to leakage from the upper cylinde... | 05/06/1980 |
| 4201238 | Emergency override with hermetic seal A hydraulically actuated gate valve having a hermetically sealed piston head adapted to receive a remotely operable actuator for overriding the valve to open the gate.... | 05/06/1980 |
| 4172612 | Car carrier with two-stage telescopic hydraulic cylinders A two-stage double acting telescopic hydraulic cylinder includes two fluid ports formed in the external cylinder, one port for receiving fluid to distend both cylinder stages and the other port for receiving fluid to retract both cylinder stages. The cyli... | 10/30/1979 |
| 4017055 | Pneumatic valve apparatus Disclosed is a pneumatic launch apparatus which employs separable telescoping tubes. The open ends of the tubes are provided with valves which automatically close upon separation of the tubes to trap operating gas in the tubes at the moment of separation.... | 04/12/1977 |
| 4012995 | Assemblies which comprise axially slidable pistons/spools In a piston and cylinder assembly the cylinder comprises at least one annular cylinder block received in a complementary bore of a housing. A means for axially retaining the cylinder block in place relative to the housing includes a pair of slidably engag... | 03/22/1977 |
| 3999634 | Pneumatic actuation for disc brake assemblies A heavy-duty disc brake assembly and pneumatic actuating assembly therefor. The pneumatic actuating assembly may include a pair of annular pistons operatively connected for simultaneous movement thereof, apparatus being provided for supplying air under pr... | 12/28/1976 |
| 3973468 | Multi-stage extendible and contractible shaft with shock absorption An extendible and contractible shaft comprises a number of shaft members on a common longitudinal axis, each except the outermost member being telescoped within the one next adjacent. Each telescoped member has a piston slidably sealed to the inner wall o... | 08/10/1976 |
| 3958493 | Multiple-stage actuating device An actuating device comprises a cylinder of hollow cylindrical form a plurality of pistons respectively of different operational strokes slidably fitted within the cylinder and undergoing sliding displacements in a mutually unitary manner in regions where... | 05/25/1976 |
