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| Number | Title | Issue Date |
| 7739871 | Press-driven tool actuation system A hydraulically-operated press-driven tool actuation system includes a press-driven hydraulic power device and/or a hydraulically-powered tool actuator. In the tool actuator, at least two pistons are carried by a housing, and at least one return device is carried by... | 06/22/2010 |
| 7424803 | Method and device for pressure amplification in cylinders, in particular hydraulic rams A method and corresponding cylinder for pressure amplification in cylinders are disclosed. A second pressurizing piston with a small piston rod is arranged within the cylinder, in other words, within the cylinder housing, by means of which the piston surface cavity ... | 09/16/2008 |
| 7301118 | Welding gun with controller and method for using same A welding gun assembly including a housing that defines a first chamber and a second chamber. The assembly also includes a first piston moveably disposed in the first chamber and a second piston moveably disposed in the second chamber. The assembly includes an inten... | 11/27/2007 |
| 7275373 | High pressure device and method for clean room applications A device uses hydraulic actuation for the closure of a vessel by a rotation-symmetric reciprocating piston mechanism of an extremely compact type, which includes a reciprocating hydraulic piston and an intensifier piston, which are in each case moved in cylinders. T... | 10/02/2007 |
| 7263831 | Air-to-oil intensifying cylinder A pressure intensifier for generating a relatively large force includes a plurality of pistons driven in advancing and retracting directions. The pressure intensifier includes a rod selectively drivable into a cavity to amplify the force acting on one of the pistons... | 09/04/2007 |
| 7231766 | High pressure intensifying piston valve The present invention includes a piston valve for charging and discharging a first fluid chamber. The piston valve includes a piston shaft and a ring comprising a seal element. The piston shaft has a first end and a second end with the first end including a counter ... | 06/19/2007 |
| 7219661 | Exhaust gas recirculation means and process for operation of the exhaust gas recirculation means The invention relates to an exhaust gas recirculation means 1 for an internal combustion engine 2 with an air supply line 12 which has an air cooler 13 and which is connected to the air inlet 10 of the internal combustion engine | 05/22/2007 |
| 7204087 | Hydraulic tool A hydraulic tool has a motor, a valve, a hydraulic intensifier, and a supply connector. The hydraulic intensifier is arranged between the valve and the motor. The valve and the motor are arranged behind one another in a longitudinal direction of the tool. The hydrau... | 04/17/2007 |
| 7159704 | Hydraulic system A hydraulic system in a motor vehicle for operating a friction clutch is described, including a slave cylinder acting upon a spring plate of the clutch, and a manually or automatically operated master cylinder acting upon the slave cylinder. The hydraulic system inc... | 01/09/2007 |
| 7107766 | Hydraulic pressurization system The present invention relates to a hydraulic pressurization system, in particular for application to pressurization devices operating in accordance with the high hydrostatic pressure principle. In particular, the present invention provides a pressurization system fo... | 09/19/2006 |
| 7044705 | Load handling machine A load handling machine includes a body, a lifting arm pivotally mounted to the body about a first pivot axis, and a load handling implement pivotally mounted to the lifting arm about a second pivot axis. A first actuator provides movement about the first axis, and ... | 05/16/2006 |
| 7010912 | Drive mechanism, particularly for a moveable part of a closing unit or the injection unit of a plastic injection moulding machine A drive device has a drive element movable axially by means of an electric motor and a hydraulic unit. In the drive device it is important to execute a rapid adjusting movement and then to exert high forces. This causes high reaction forces on the lifting spindle. H... | 03/14/2006 |
| 6996984 | Air-to-oil intensifying cylinder A pressure intensifier for generating a relatively large force includes a plurality of pistons driven in advancing and retracting directions. The pressure intensifier includes a body having a cavity used as an internal fluid reservoir. Furthermore, a damping mechani... | 02/14/2006 |
| 6993907 | Automotive hydraulic braking system and a hydraulic brake intensifying apparatus for use therein The subject invention provides an improved hydraulic braking system and a hydraulic pressure intensifying apparatus (10) for use in the braking system. The braking system includes a master cylinder assembly (26, 126), with the intensifying apparatus ( | 02/07/2006 |
| 6925916 | Two stage punch press actuator with output drive shaft position sensing A press for forming a workpiece with a tooling set includes an actuator assembly carrying a movable half or punch of the tooling set and having a two phase operation. In the first phase the actuator provides relatively low force in moving the punch to an intermediat... | 08/09/2005 |
| 6895749 | Double-acting pressure intensifying cylinder and method for intensifying pressure in the cylinder A double-acting pressure intensifying cylinder and method, wherein a first cylinder a second cylinder are connected via an operation chamber in series. The first fluid chamber is provided with a first piston and the second fluid chamber is provided with a second pis... | 05/24/2005 |
| 6779343 | Air to oil intensifier A pressure intensifier for generating a relatively large output force includes a piston driven in an advancing direction and a retracting direction. In one embodiment, two pistons are also driven to eliminate the need for a high pressure source. Another embodiment i... | 08/24/2004 |
| 6735944 | Air to oil intensifier A pressure intensifier for generating relatively large output force includes a piston driven in an advancing and a retracting direction. The piston provides a relatively large cross-sectional area for a pressurized fluid to act during the retracting stroke. As such,... | 05/18/2004 |
| 6581379 | Pressure intensifying apparatus for hydraulic cylinder There are provided a pressure intensifying cylinder 2a for allowing a pressure intensifying chamber 31 to communicate with a head-side cylinder chamber 22 of a working cylinder 1 and its control hydraulic circuit. When a load and a rated pressure Pp of a ... | 06/24/2003 |
| 6502395 | Seal for hydropneumatic pressure intensifier The invention relates to a hydropneumatic pressure intensifier comprising a radial seal (24, 27). Said seal is arranged between working pistons (2) and the cylinder bore which accommodates said pressure intensifier or in a bore hole (15) between the worki... | 01/07/2003 |
| 6012287 | Fluid actuator system having means for internally increasing the fluid pressure therein A fluid actuator system disposed for internally increasing fluid pressure therein. The system includes a first fluid actuator including a cylinder provided with a first axial bore having a first piston and piston rod reciprocally mounted therein. The firs... | 01/11/2000 |
| 5943862 | Hydropneumatic machine tool with cushioning A machine tool which operates with a hydropneumatic pressure intensifier whose step piston is braked hydraulically in particular towards the end of its stroke by forcing hydraulic fluid from a braking cavity formed during the stoke via a choke point.... | 08/31/1999 |
| 5916141 | Tandem master cylinder of brake system in an automobile A tandem master cylinder comprising first and second oil chambers having first and second pistons and first and second springs disposed in each of said respective chambers, the second piston being connected with a hydraulic push rod; a bypass chamber; and... | 06/29/1999 |
| 5865029 | Air/oil intensifier having multiple sensors An intensifier type of fluid actuator includes multiple sensors for sensing various operational characteristics of the intensifier. The intensifier includes a first manifold connected by a first tube to a second manifold to define an intensifier chamber, ... | 02/02/1999 |
| 5836161 | Hydraulic pressure booster A hydro-pneumatic pressure booster is proposed in which the reservoir chamber is limited by an elastic partition wall instead of a sliding piston.... | 11/17/1998 |
| 5483796 | Fluid cylinder A second pressure intensifying cylinder subchamber is employed for moving a pressure intensifying piston toward the other side, and the necessity for a control valve with a throttle is thereby eliminated. The pressure intensifying piston is incorporated i... | 01/16/1996 |
| 5480222 | Automotive hydraulic braking system An automotive hydraulic braking system includes a pivoted brake lever coupled to a master hydraulic cylinder assembly which in turn is coupled by a brake line to a plurality of hydraulically actuatable calipers. A mechanical brake pressure intensifier is ... | 01/02/1996 |
| 5399071 | Pressure booster A liquid pressure booster includes a head member with a low-pressure inlet connectable to a liquid source at mains pressure, a high-pressure outlet connectable to the object to be tested, and a central bore, a compound cylinder constituted by a first, upp... | 03/21/1995 |
| 5396771 | Apparatus for transmitting hydraulic pressure A hydraulic pressure transmitting apparatus for energizing power cylinders of the kind useful in moving load-carrying platforms on vehicles or the like, being of extremely compact structure on account of a manifold constituted by an end section of a cylin... | 03/14/1995 |
| 5381661 | Hydraulic pressure transformer The invention relates to a hydraulic pressure transformer, wherein a storage chamber and a work chamber are connected with each other via an overflow bore into which a plunger piston dips to generate a pressure stage and thereby separates the two chambers... | 01/17/1995 |
| 5377488 | Hydro-pneumatic pressure transformer A hydro-pneumatic pressure transformer with a storage piston fixed between storage oil and compressed air, which furthermore is centrally penetrated by a plunger piston, wherein, for the separation of oil from water, relief grooves are provided on the jac... | 01/03/1995 |
| 5265423 | Air-oil pressure intensifier with isolation system for prohibiting leakage between and intermixing of the air and oil The present invention is drawn to an isolation system for separating two diverse fluid mediums from each other and, more particularly, an isolation system for prohibiting leakage of the diverse mediums around the peripheral surface of a piston movably mou... | 11/30/1993 |
| 5188014 | Hydraulic cylinder with pressure transmission The hydraulic cylinder comprises a cylinder jacket (1), a piston-rod guide flange (2), and a cylinder bottom (3). Disposed within the cylinder are a primary piston (4) provided with a piston rod (6) and a secondary piston (11) connected to two plungers (7... | 02/23/1993 |
| 5125234 | Hydraulic cylinder apparatus of the type actuated by booster In a hydraulic cylinder apparatus of a type actuated by a booster, a plunger chamber (39) of a booster (32) is connected in communication with an extension cylinder chamber (35) of a hydraulic cylinder (30). An annular oil make-up chamber (48) is disposed... | 06/30/1992 |
| 5094081 | Hydraulic brake system valved piston A hydraulic vehicle brake system of the type having a high system return pressure is provided. In order to minimize the size and strength of brake return springs required, the invention provides a device to be interposed between the brake and the brake co... | 03/10/1992 |
| 5052182 | Hydraulic brake booster system with check valve in brake fluid reservoir line A tandem master brake cylinder has first and second pistons, each piston associated with a fluid chamber and a pressure chamber. The pistons are displaced in response to actuation of a brake pedal. A hydraulic booster is coupled to a power source and is o... | 10/01/1991 |
| 5048397 | In-line hydraulic pressure intensifier The subject invention comprises a hydraulic pressure intensifier (10) including a cylinder (42) having a fluid inlet (44) at one end and a fluid outlet (46) at the other end. Two telescopically disposed pistons (54, 56) are slideably supported between the... | 09/17/1991 |
| 5027599 | Hydraulic braking system A hydraulic braking system includes a tandem master cylinder having a bore with an opening and a closed wall at opposite ends thereof which formed in a housing, a first piston slidably fitted in the bore so as to define a first pressure chamber and a firs... | 07/02/1991 |
| 4993226 | Multi-piston air-oil pressure intensifier with automatically variable working stroke length A pressure intensifier comprising a housing incorporating a first floating piston-cylinder unit with means to supply a primary pressure fluid medium to one side of the piston to apply pressure to a fluid medium in contact with the other side of the first ... | 02/19/1991 |
| 4976190 | Hydraulic brake intensifier The subject invention comprises a hydraulic pressure intensifier (10) including a cylinder (42) having a fluid inlet (44) at one end and a fluid outlet (46) at the other end. Two telescopically disposed pistons (54, 56) are slideably supported between the... | 12/11/1990 |
