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| Number | Title | Issue Date |
| 7377238 | Variable compression ratio device of internal combustion engine A variable compression ratio device of an internal combustion engine includes a piston inner part connected to a connecting rod and a piston outer part fitted on an outer periphery of the piston inner part. The piston outer part is only slidably in an axial directio... | 05/27/2008 |
| 7303053 | Non-pressure head with integrated piston stop and vent/drain A non-pressure head for a fluid cylinder, which includes a drain channel formed in the flange by a raised portion of the flange extending from a plane of the flange in the same direction as the head portion. The channel is cold formed in the flange. For the piston s... | 12/04/2007 |
| 7270048 | Pump A pump (1) with an oscillating part having a housing (2) with a working chamber (3) and a crankcase (4) defined from the working chamber by the pump part. A pump drive mechanism (6) with a drive shaft (7) is located inside t... | 09/18/2007 |
| 7197875 | Hydraulic cylinder with coaxial, in-line reservoir A compact hydraulic cylinder may include a pressure chamber and a reservoir in coaxial, in-line arrangement relative to one another. The pressure chamber and reservoir are separated from one another in use by a piston and hydraulic seal. The piston may be withdrawn ... | 04/03/2007 |
| 7172200 | Sealing arrangement on piston rods A sealing arrangement on piston rods with a rod guided in a cylindrical compressed-gas space, particularly on piston rods of high-pressure pneumatic springs or gas-filled shock absorbers, with at least one seal disposed on the piston rod for sealing the compressed-g... | 02/06/2007 |
| 7121191 | Air-operated brake actuator with control valve An air-operated brake actuator system of a vehicle comprises a spring brake actuator and a service brake actuator, the spring brake actuator including a sealed housing with a spring chamber and a pressure chamber, and a hollow actuator rod disposed in the spring bra... | 10/17/2006 |
| 7118046 | Sliding structure for shaft member with improved abrasion resistance and injector In a sliding structure in which a shaft member is retained slidably in a guide hole, the lack of an oil film caused by the edge contact of the shaft member to which a pressing load in the axial direction is applied is prevented. With the fact being taken into accoun... | 10/10/2006 |
| 7086784 | Bearing unit for the hub of a vehicle wheel equipped with a tire inflating system A bearing unit comprises a radially outer stationary race (1) and a pair of radially inner rotatable half-races (2a, 2b). Au intermediate annular chamber (8) is defined between the outer race (1) and the inner half-ra... | 08/08/2006 |
| 6918336 | Rotary hydraulic machine An expander that converts the thermal energy and the pressure energy of a working medium into mechanical energy includes, within a casing (12, 15, 18), an operating part such as a group of axial piston cylinders operated by the working medium introduced into ... | 07/19/2005 |
| 6907818 | System and method for providing dry filtered air to a brake actuator A spring brake actuator that utilizes a valve for providing compressed air to a spring cavity, the air having previously been dried and filtered so as to prevent contaminates and moisture from corroding and/or damaging the spring in the spring cavity, the valve bein... | 06/21/2005 |
| 6711984 | Bi-fluid actuator The invention is a bi-fluid actuator for precise bi-directional movement and positioning of a mechanical object or load. The bi-fluid actuator includes a pneumatic fluid container defining opposed first and second pneumatic fluid chambers, and having a first mechani... | 03/30/2004 |
| 6651547 | Guide for the piston rod of a piston-cylinder assembly Guide for the piston rod of a piston-cylinder assembly, especially for a vibration damper, a shock-absorbing strut, or a level-control element, where the guide body holds the cylinder tube and the outside tube and simultaneously centers the piston rod in ... | 11/25/2003 |
| 6588314 | Sealed brake actuator A sealed air-operated brake actuator comprising a brake actuator divided into a spring chamber and a pressure chamber. An extra-large force compression spring is contained in the spring chamber. The spring chamber is fluidly exhausted through a one-way va... | 07/08/2003 |
| 6478554 | Hydraulic unit The invention relates to a hydraulic unit for a hydraulic control and/or regulating device, in particular for anti-blocking and/or anti-slipping brake systems, comprising control and regulating electronics arranged in a control housing as well as a valve ... | 11/12/2002 |
| 6422272 | Strap sealer with fast-acting dual action piston A strap sealer has a dual action piston. A seal forming assembly is operably connected to the piston. The sealer includes a housing that defines a cylinder and has a penetration therein. A piston is disposed in the cylinder for reciprocating movement. The... | 07/23/2002 |
| 6113364 | Pump unit for a slip-controlled, hydraulic brake system of motor vehicles A pump housing, including a pump unit having a collection chamber that receives leaking brake fluid. In the installed position of the pump unit, an outflow bore leads downward from the collection chamber to the ambient air. A body which in one direction a... | 09/05/2000 |
| 6014862 | Emulator damping mechanism A brake system includes a pedal feel emulator and a master cylinder with a damping mechanism having a damping piston. When the emulator piston is moved from the at-rest position, fluid is displaced from the emulator through a compensation port and through... | 01/18/2000 |
| 5960696 | Hydraulic cylinder with press-fitted pipe It is intended to dispense with the pipe welding work, thereby improve the pipe mounting performance and prevent contamination which results from welding, and elimination the waste of oil. A spigot portion 34 is mounted upright integrally in the center of the ... | 10/05/1999 |
| 5899136 | Low leakage plunger and barrel assembly for high pressure fluid system An improved plunger and barrel assembly is provided which includes a plunger reciprocally mounted in a cavity formed in the barrel and a leakage flow reduction device positioned in the cavity for reducing fluid leakage flow around the plunger thus increas... | 05/04/1999 |
| 5873297 | Fluid-operated brake actuator with check valve A fluid-operated brake actuator having a check valve in the spring chamber to equalize the pressure on opposite sides of an operating movable diaphragm. The check valve being double redundant and tamper resistant and comprising a tubular body having a fir... | 02/23/1999 |
| 5809866 | Method and apparatus for venting air from the crank case of a compressor A downwardly opening compartment is disposed within a crank case. An upwardly disposed hole places the compartment in fluid communication with the environment. As blowby mist in the crank case travels upward through the compartment, the mist tends to sepa... | 09/22/1998 |
| 5775886 | Gas compressor with reciprocating piston with valve sheath A highly manufacturable gas compressor includes a sheath removably attached to a piston by several resilient fingers that snap into place at the bottom of the piston. The fingers act to limit relative motion between the piston and sheath as the piston is ... | 07/07/1998 |
| 5743168 | Device for lubricating an assembly between two mechanical components which can move with respect to each other, especially a connecting rod/piston articulation A device including a first moving part such as a piston (1) and a second moving part such as a connecting rod (2) with a coupling part (4) therebetween. A low-pressure compressible liquid lubricant feed system delivers a liquid into a chamber (10) with a ... | 04/28/1998 |
| 5737920 | Means for improving the prevention of icing in air motors A defined exhuast restriction in the form of an orifice or variable valve is provided to back-pressure the pulsating exhaust of an air motor or the like to reduce the formation of ice in the exhaust system.... | 04/14/1998 |
| 5722311 | Fluid-operated brake actuator with spring chamber isolation A brake actuator (10) for a vehicle comprises a service brake housing (14), a tandem spring brake housing (16) and a diaphragm (52), dividing the interior thereof into a first spring chamber (62) and a second spring chamber (63). In one embodiment, the fi... | 03/03/1998 |
| 5701797 | Sealing system A piston reciprocally movable within a cylinder is sealed to the cylinder wall by fluid at a pressure greater than those of the fluids on the opposed sides of the piston supplied to the space (18) between two seals (19, 20) operative between the piston an... | 12/30/1997 |
| 5671654 | Sealed spring brake actuator An improved brake actuator is fully sealed against ingress of liquid or other contaminants. Separate breather tubes selectively communicate each of the pressure ports to the non-pressurized sides of the service and spring chambers. The separate breather t... | 09/30/1997 |
| 5655433 | Piston-piston ring assembly and method for reducing engine exhaust emissions A piston--piston ring assembly for an internal combustion engine reduces hydrocarbon emissions without significantly increasing the cost of the engine. The assembly includes an upper piston ring groove and a piston ring which acts as check valve to preven... | 08/12/1997 |
| 5638676 | Fluid power cylinder The fluid power cylinder possesses a housing, wherein a piston space is defined to accommodate a piston. In or on the housing a pressurized fluid receiver is arranged which possesses at least one receiver chamber connected with the piston space and which ... | 06/17/1997 |
| 5600955 | Hydraulic servoactuator stabilizer device Unbalanced oscillatory pressures, developed on the power piston of hydraulic servoactuator systems cause vibrations on actuator housing supports. An unbalanced oscillatory force results, when two sides of the power piston are subjected to two unequal osci... | 02/11/1997 |
| 5515769 | Air compressor An oilless reciprocating compressor for use in a refrigerated controlled atmosphere has an uncooled, fully sealed crankcase. A bypass tubing connects the interior of the crankcase with the inlet of the cylinders, so that blow-by is returned from the crank... | 05/14/1996 |
| 5493954 | Self-venting seal assembly A self-venting seal assembly for use in an ultrahigh-pressure pump is shown and described. In a preferred embodiment, a low-pressure seal is used to energize a high-pressure seal, the low-pressure seal having a "u" shaped cross-section, thereby creating a... | 02/27/1996 |
| 5469704 | Hydraulic drive apparatus comprising a cylinder The invention relates to a hydraulic drive apparatus having a cylinder. Said cylinder comprises a piston movably mounted in a working chamber, a piston rod which is guided towards the outside through a cylinder head and a wear resistant primary seal and a... | 11/28/1995 |
| 5415078 | Reciprocating piston machine This invention relates to reciprocating piston machines which use the crankcase for pumping air or charge. The connecting rod with extension partitions the interior of the crankcase including the lower cylinder into two varying volumes during a portion of... | 05/16/1995 |
| 5410947 | Volume-compensated low-wear reciprocating seal assemblies A fluid-powered actuator (42) has a body (11) which includes an end wall (16) provided with a through-opening (21). A piston rod (44) has an inner portion (44A) arranged on one side of the end wall within a pressurizable working chamber (24) of the actuat... | 05/02/1995 |
| 5383770 | Radial piston pump with vent in hollow piston A vibration and noise free pump is disclosed. The pump includes a plurality of cylinders in radial arrangement about an axis. A piston is slidably supported in each of the cylinders. Each of the pistons has a vent opening in addition to a set of inlet ope... | 01/24/1995 |
| 5341726 | Piston for tank An elongate tank for transport or for storage in bulk of semisolid and fluid materials, such as grease and oil. The tank has an outlet at one end thereof for discharging material contained therein, and has a generally cylindric interior surface. A general... | 08/30/1994 |
| 5314172 | High pressure die cylinder and manifold system A high pressure die cylinder and manifold system including a plurality of die cylinders mounted on a manifold. Each die cylinder includes a cylinder body in which a piston rod and a piston is positioned for limited relative movement with respect to the cy... | 05/24/1994 |
| 5271314 | Raisable anti-crash shock absorber The shock absorber comprises a strut, a sliding rod slidably mounted relative to the strut and co-operating therewith to define both a shock absorbing chamber and a raising chamber which is connected to a member for feeding it with raising liquid, a dip t... | 12/21/1993 |
| 5261316 | Angular displacement motor with counterbalance chambers An articulated mechanism for use as an articulated arm of an industrial robot, for example, includes a plurality of arms interconnecting articulations having respective fluid pressure angular displacement motors for angularly displacing the arms relativel... | 11/16/1993 |
