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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 |
| 7351053 | Drive unit A drive unit, in particular for a closing unit, an injection unit, or an ejector of an injection molding machine, may be used where a high axial force is applied through a hydraulic power converter. A cylinder of the power converter may be fixed relative to a frame ... | 04/01/2008 |
| 7240490 | Tool arrangement and application of said tool arrangement A tool arrangement includes a tool unit 2, e.g. a cutting apparatus 2′, a spreader 2″, a squeezing device or the like, and a drive 3, a control and/or switching clement, as well as a first operating-medium circuit 4, in which t... | 07/10/2007 |
| 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 |
| 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 |
| 7124581 | Drive mechanism, particularly for a closing unit, an injection unit or an ejector of a plastic injection moulding machine A drive mechanism for an injection molding machine has an output element that is moveable in a straight line and an electric motor drive unit having an electric motor and a piston-cylinder unit which has a first piston-cylinder unit in the force chain between the ou... | 10/24/2006 |
| 7044217 | Stuffing box for progressing cavity pump drive Progressive cavity (PC) pump drive heads require a stuffing box to seal crude oil from leaking onto the ground where the polish rod passes from the crude oil passage in the wellhead to the drive head. Because crude oil typically contains fine sand particles, alignme... | 05/16/2006 |
| 7025354 | Card game A skinning card game. The game includes a marked playing surface, one or more standard decks of playing cards, a spinning wheel, and chips. The marked playing surface is provided with several identical player grids and a dealer grid. Each player and dealer grid cont... | 04/11/2006 |
| 7021172 | Hydraulic throttle for vehicles A hydraulically operated throttle system that has the hydraulic system components installed entirely within the throttle grip on the handlebar. A regular throttle cable is run through the frame/handlebar where it connects to the hydraulic system. A three-piston syst... | 04/04/2006 |
| 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 |
| 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 |
| 6705082 | Hydraulic pressure booster cylinder Disclosed is a hydraulic pressure booster cylinder. In a low pressure stroke, in a state wherein a slide piston is positioned close to a third piston, as compressed air is supplied into a second pneumatic chamber, a second piston is moved toward a bore, and thereby ... | 03/16/2004 |
| 6561596 | Brake booster A hydraulic brake booster (12) for use in a brake system (10) having a first housing (100) with a first bore (102) separated from a second bore (104). The first bore (102) retains a power piston (118) and the second bore (104) retains a control valve arra... | 05/13/2003 |
| 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 |
| 6354082 | Air/water intensifier An intensifier type of fluid actuator using air and water as working fluids therein includes first and second bodies that can be separate components or incorporated into a single structure. The first body includes a first manifold connected by a first tub... | 03/12/2002 |
| 6282896 | Idle stroke shortening device in brake system A brake system 1 of the invention comprises a brake pedal 2, a booster 3 which boosts the input force applied by the brake pedal 2 and outputs the boosted force, a travel amplifying mechanism 4 which amplifies the travel of an output shaft of the booster ... | 09/04/2001 |
| 6257117 | Cylinder apparatus The inside of a cylinder is divided into front and rear cylinder chambers, a primary-side piston and a secondary-side piston, each formed by an annular disc part and an annular tube part are fitted into each cylinder chamber, with the annular tube parts o... | 07/10/2001 |
| 6226993 | Fully hydraulic brake booster/master cylinder unit A fully hydraulic brake booster/master cylinder unit (10) for a vehicle brake system has a housing (12) and a bore (14) which is formed therein and in which is arranged sealingly and displaceably a primary piston (16) which is coupled to an input member (... | 05/08/2001 |
| 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 |
| 6003429 | High speed and high-load cylinder device and method for controlling the same A high speed and high load operable hydraulic drive cylinder system comprises a principal cylinder (3) with a piston (3a)) defining an upper and a lower chamber (3c, 3d) and a piston rod (3b), and a subsidiary cylinder (2) smaller in pressure receiving ar... | 12/21/1999 |
| 5983637 | Hydraulic brake booster having piston travel limit feature A brake booster for a brake system of a vehicle, wherein the brake booster is in fluid communication with a source of pressurized fluid. The brake booster includes a housing having a bore formed therein and a conduit formed therein being in fluid communic... | 11/16/1999 |
| 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 |
| 5894729 | Afterburning ericsson cycle engine This invention is a heat engine operating on the afterburning Ericsson cycle whose principle is heat addition to the cycle by an afterburner in which fuel is burned with the low-pressure air working fluid exhausted by the expander. The resulting combustio... | 04/20/1999 |
| 5890363 | Brake-pressure producing device In a brake-pressure producing device of the present invention, a power piston 10 of a hydraulic booster 2 comprises a stepped piston including a large-diameter portion 10a on which fluid pressure of a power chamber 30 is exerted and a small-diameter porti... | 04/06/1999 |
| 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 |
| 5865088 | High-speed safety circuit for a hydraulic press A high speed safety circuit arrangement is provided for a hydraulic press which is driven by a hydraulic cylinder assembly constituted by a principal cylinder unit and a subsidiary cylinder unit. The circuit arrangement comprises a servo valve disposed in... | 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 |
| 5735124 | Internally boosted master cylinder A brake system for use in connection with a vehicle including a hydraulic internally boosted master cylinder, a hydraulic pump, and hydraulic brakes wherein the master cylinder controls hydraulic fluid pressure to the brakes and has a primary or sensing p... | 04/07/1998 |
| 5649424 | Two-stage pressure cylinder A two-stage pressure cylinder having a work cylinder (17,100) with a work piston (18,108), and piston rod (20,110) for contact with a work piece, in which the work piston is movable, an oil cylinder (56,116) to contain hydraulic fluid (H), an oil piston (... | 07/22/1997 |
| 5582009 | Air-oil intensifier An intensifier type of fluid actuator includes a body including a first manifold connected by a first tube to a second manifold to define an intensifier chamber, a third manifold connected by a second tube to the second manifold to define a reservoir cham... | 12/10/1996 |
| 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 |
| 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 |
| 5330259 | Electrohydraulic braking system with remote booster A brake system (10) comprising: a master cylinder (20) including a primary (24) and a secondary (26) chamber and a reservoir (26); an accumulator (40), a pump (42) having first inlet port connected to a reservoir (26) of the master cylinder (20) and the s... | 07/19/1994 |
| 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 |
| 5247871 | Combined pneumatic-hydraulic press head with high actuation speed The combined pneumatic-hydraulic press head includes a body inside which a substantially cylindrical main chamber is defined; the chamber accommodates a main piston and a secondary piston so that they can slide along an axial direction. The main piston ha... | 09/28/1993 |
| 5247870 | Combined pneumatic-hydraulic press with controlled stroke The combined pneumatic-hydraulic press with controlled stroke, includes a body inside which a substantially cylindrical main chamber is defined; the main chamber accommodates, so that it can slide along an axial direction, a working piston which protrudes... | 09/28/1993 |
| 5218821 | Pressure intensifier cylinder utilizing air A pressure intensifier drive unit has walls that form a cylinder with an intermediate divider plug separating a working chamber and a pressure intensifying chamber aligned in the cylinder. The working chamber has a working piston and a working piston rod ... | 06/15/1993 |
