Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7461583 | Variable tension ring mechanism A piston assembly is described including a connecting rod and a piston head secured to the connecting rod and in operational communication with the connecting rod. The piston head has a circumferential groove extending inwardly from an exterior surface of the piston... | 12/09/2008 |
| 7458309 | Reciprocating pump, system or reciprocating pumps, and method of driving reciprocating pumps Reciprocating pumps are disclosed. Particularly, reciprocating pumps including pressure chambers and fluid chambers defined by flexible members are disclosed. The volume of the pressure chambers and fluid chamber may be controlled using a piston driven by the flow o... | 12/02/2008 |
| 7458314 | Gas spring A gas spring (1) comprises a piston rod (4) projecting from an open end of a cylinder (2) so as to be able to elongate and contract axially, and a dust seal (10) which is in contact with the piston rod (4) to prevent dust from inva... | 12/02/2008 |
| 7454908 | Zero turn transaxle A transaxle including a hydrostatic transmission mounted in a transmission housing and having a pair of hydraulic pumps and hydraulic motors operatively connected together through a center section mounted in the housing. First and second axle housings are mounted on... | 11/25/2008 |
| 7454909 | Impedance shaping element for a control system An impedance shaping element (or more simply, an impedance shaper) physically alters or shapes the mechanical impedance of a drive system as it appears from an interface and facilitates use of feedback control to improve performance by altering or shaping a dynamic ... | 11/25/2008 |
| 7455010 | Expanded barrel hydraulic cylinder assembly The hydraulic cylinder assembly of the present invention provides an enlarged barrel and a compressible locking ring that secure a rod gland in the rod end of the cylinder. The tapered barrel prevents the rod gland from sliding into the cylinder and the locking ring... | 11/25/2008 |
| 7455009 | Hinge for a variable displacement compressor A variable displacement compressor is provided. The compressor has a crankcase, a plurality of pistons, a swash plate, and a rotor assembly. The crankcase has a plurality of chambers for receiving a fluid. The plurality of pistons are disposed within the cylinder bl... | 11/25/2008 |
| 7454907 | Hydrostatic transmission An axle driving apparatus including a hydrostatic transmission disposed in a housing, with at least one axle extending from a side of the housing and an input shaft extending into the housing to drive the hydrostatic transmission, an output shaft engaged to and driv... | 11/25/2008 |
| 7451690 | Spring-actuated air-brake cylinder for vehicle brake systems A spring-actuated air-brake cylinder as the diaphragm cylinder for vehicle brake systems includes a diaphragm, an actuator-spring chamber in which there is received a spring-actuated piston, which is acted on by a compression spring as the actuator spring and is act... | 11/18/2008 |
| 7451687 | Hybrid nutating pump A nutating pump for creating pressure or a vacuum. The nutating pump includes a housing with a center support positioned within said housing. The center support includes a semi-spherical recess. The pump also includes a drive shaft adapted to be connected to an elec... | 11/18/2008 |
| 7451688 | Lock mechanism for use with fluid pressure-operated apparatus A lock mechanism is provided in a head cover of a cylinder tube. The lock mechanism comprises a holder, which is installed in the head cover, a plurality of balls that are retained displaceably in a radial direction with respect to the holder, and a displacement mem... | 11/18/2008 |
| 7451684 | Actuator device with a microwave position detecting device An actuator or servo device comprises an actuator member adapted to move linearly in the motion space of an actuator housing, a microwave position detecting device for detecting the position of the actuator member in the motion space, the actuator member being capab... | 11/18/2008 |
| 7448309 | Hydraulic arrangement A hydraulic arrangement for implementing a float position is provided. The arrangement includes: a hydraulic cylinder having a first chamber and a second chamber, a first supply pipe connected to the first chamber and a second supply pipe connected to the second cha... | 11/11/2008 |
| 7448311 | Displacement difference-absorbing mechanism for cylinder apparatus A coupler is provided inside an engaging hole of a piston yoke, which is connected to pistons. A slider is installed on an upper portion of the coupler through a coupler-insertion hole. An engaging member, provided at a lower portion of the coupler, is inserted into... | 11/11/2008 |
| 7444923 | Synthetic leather packings for reciprocating piston pump A packing stack for a reciprocating piston pump is formed of alternating V's of UHMWPE and either a polyurethane thermoplastic elastomer or an olefinic thermoplastic elastomer. ... | 11/04/2008 |
| 7444922 | Fastening assembly, fastener, and fluid pressure cylinder unit Each of two members to be fastened has a connecting surface, a communication groove opening on the connecting surface, and an engagement groove communicating with the communication groove and having an engagement surface parallel to the connecting surface. A fasteni... | 11/04/2008 |
| 7444921 | Swash ring compressor A variable displacement compressor is disclosed. The compressor includes a crankcase for receiving a fluid. The crankcase has a plurality of compression chambers in which the fluid is compressed. A plurality of pistons disposed within the crankcase and are configure... | 11/04/2008 |
| 7441493 | Sealing device for a radial swivel motor Swivel motors have a large number of tightness problems on the inside, in particular in a broad operating temperature range. Therefore, to improve the tightness over a temperature range of −40° C. to +130° C., a sealing device (20) is provided with an inn... | 10/28/2008 |
| 7441408 | Fixing of a brake-fluid reservoir The invention relates to a brake fluid reservoir comprising at least two lateral mounting lugs (10, 11) designed to be placed either side of a central mounting lug (20) of a brake master cylinder. Collinear holes (12, 13, 21) traverse these lugs... | 10/28/2008 |
| 7441494 | Industrial truck having a lifting mast and tilting cylinders having an integrated hydraulic distributor An industrial truck includes a tiltable lifting mast (1), a first tilting cylinder (2), and a second tilting cylinder (3). The two tilting cylinders (2, 3) are of double-acting design and are connected hydraulically in parallel. Two hydra... | 10/28/2008 |
| 7437989 | Connecting rod for hermetic compressor A connecting rod for a hermetic compressor is provided. The connecting rod includes a piston connecting portion, a body having an end connected to the piston connecting portion, a crankshaft connecting portion connected to a different end of the body and extending a... | 10/21/2008 |
| 7437873 | Connection block for a hydrostatic piston machine The invention relates to a connection block for a hydrostatic piston machine which is provided for simultaneous operation in a first hydraulic circuit and a second hydraulic circuit. A first working pressure duct (60) and a second working pressure duct (61... | 10/21/2008 |
| 7434395 | Apparatus and method for dual mode compact hydraulic system A dual mode hydraulic actuator, comprising: a housing; a rod secured to a piston, the rod and piston being slidably received within the housing; a first chamber positioned on one side of the piston; a second chamber positioned on another side of the piston; a sealed... | 10/14/2008 |
| 7434393 | Control system and method for supplying pressure means to at least two hydraulic consumers Disclosed are a control arrangement and a method for the pressure medium supply of at least two hydraulic consumers that are supplied with pressure medium through the intermediary of a variable displacement pump. In the pressure medium flow path between the consumer... | 10/14/2008 |
| 7434392 | Configurable hydraulic system for agricultural tractor and implement combination When different implements are attached to an agricultural tractor, various hydraulic actuators on the implement are operated by connection to the hydraulic system on the tractor. A single hydraulic fluid connector on the tractor has first and second ports with a sep... | 10/14/2008 |
| 7434504 | Cylinder for pressurised fluids A Cylinder for pressurized fluids, such as oil, air or the like, including of a cylindrical nozzle and a pair of heads designed to be attached to the ends of the nozzle, characterized in that two annular grooves are made partly in the cylinder liner and partly in ea... | 10/14/2008 |
| 7430859 | Fluid pump control system for excavators A fluid pump control system for excavators enables fluid pumps to produce hydraulic flows of a quantity great enough to actuate hydraulic actuators for smooth composite operations. The system includes variable displacement fluid pumps, fluid quantity control mechani... | 10/07/2008 |
| 7430861 | Shift controlled bypass orifice for hydrostatic transmission A shift controlled bypass orifice for a hydrostatic transmission includes a pump valve body with high pressure ports through which hydraulic fluid flows between a pump and a motor, a bypass orifice extending between the high pressure ports and the outside of the pum... | 10/07/2008 |
| 7430955 | Hydraulic arrangement A hydraulic arrangement is provided for a tool locking device of a loader. The hydraulic arrangement comprises a hydraulic cylinder with first and second chambers, which cylinder has a first position for unlocking and a second position for locking, a first supply li... | 10/07/2008 |
| 7430953 | Loading implement and process for loading implement A loading implement and method of operating a loading implement for the adjustment of a floating condition of a boom of the loading implement. The loading implement includes a hydraulic arrangement for the lifting and lowering of the boom, a hydraulic conveying devi... | 10/07/2008 |
| 7430863 | Pump unit and hydrostatic transmission There is provided a pump unit configured to be capable of transmitting a rotational power from a driving power source which is operatively connected thereto to an actuator through a pair of hydraulic fluid lines. The pump unit includes: an input shaft; a hydraulic p... | 10/07/2008 |
| 7428862 | Cladded axial motor/pump piston and method of producing same A method of producing a piston that involves providing a piston body formed of a first material, the piston body having a cylindrical portion having a diameter, a rounded end, and a neck connecting the rounded end to the cylindrical portion and having a diameter les... | 09/30/2008 |
| 7428812 | Hydraulic tool with wobble plate transmission A hydraulic tool including a motor; a hydraulic pump comprising only one reciprocating piston pump member; and a transmission connecting the motor to the hydraulic pump. The transmission includes a wobble plate and at least one spring. The wobble plate includes a fr... | 09/30/2008 |
| 7426884 | Circuit arrangement A circuit arrangement includes a load sensing system (LS) with individual loads (10,14) arranged in series forming a series section, and in parallel forming a parallel section. A hydraulic supply circuit (12) includes a supply pump (P) and a runback ( | 09/23/2008 |
| 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 |
| 7424846 | Pneumatically static balancer for machine tool A pneumatically static balancer for a machine tool counterbalances or lightens a gravitational load generated by an own weight of a vertically moving driven member. The pneumatically static balancer includes a pneumatic cylinder supporting the driven member and allo... | 09/16/2008 |
| 7421840 | Energy conversion and dissipation system A hydraulic energy conversion and dissipation system comprises a hydraulic retarder pump driven by a source of a mechanical energy needed to be dissipated for converting the mechanical energy into a waste hydraulic energy, a hydraulic flow retarder provided for conv... | 09/09/2008 |
| 7421841 | Three-shift lifting mechanism for jack or the like The load dependent, variable displacement, at least three-shift hydraulic mechanism includes a hydraulic device disposed at the front side of a valve block and adapted to move a ram piston oriented such as to raise weight, the hydraulic device defining an oil accumu... | 09/09/2008 |
| 7418820 | Wind turbine with hydraulic transmission A wind turbine includes a closed loop hydrostatic transmission. The rotor is directly coupled to a low-speed high torque hydraulic motor, which is pressure-reversible to act as a pump. A variable displacement, pressure compensated hydrostatic transmission receives t... | 09/02/2008 |
| 7418819 | Pump unit The present invention provides a pump unit including at least one hydraulic pump with inlet and outlet ports, a pump case for accommodating the hydraulic pump having an opening through which the hydraulic pump is insertable, and a lid, called a center section, closi... | 09/02/2008 |
