Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7503251 | Load balance adjusting method and equipment of lifting jacks, and jack-up equipment A load balance is adjusted to be appropriate even if shared loads of lifting jacks are fluctuated from an initial setting state caused by cumulative errors of suspending rods. It is a load balance adjusting method of the lifting jack when a lifting module is jacked ... | 03/17/2009 |
| 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 |
| 6223646 | Camless valve actuator for compression braking and normal engine operations An actuator for opening a poppet exhaust valve, which is closed by a spring and opens in normal operation against a relatively low pressure and which opens for compression braking against a relatively high pressure, is motivated in either event by the sam... | 05/01/2001 |
| 6017198 | Submersible well pumping system The invention generally concerns a submersible well pumping system comprising an axially elongated housing having a diameter less than the bore hole of the well, a multi-chamber hydraulically driven diaphragm pump, suspended in the well using coiled tubin... | 01/25/2000 |
| 5701796 | Hydraulic apparatus for traveling In a hydraulic apparatus for traveling, a left direction switching valve is formed by forming a spool bore having a pump port, an actuator port and a return port in a first valve block, and by disposing a spool within the spool bore for establishing and b... | 12/30/1997 |
| 5651436 | Brake and clutch control system A control system for a press having a clutch and a brake includes a clutch control valve and a brake control valve. The clutch control valve operates the clutch by supplying pressurized air to the clutch. The brake control valve operates the brake by supp... | 07/29/1997 |
| 5651390 | Pressurized fluid supply system A direction control valve is formed by providing a main spool for establishing and blocking communication between an inlet port, first and second actuator ports and first and second tank ports. A pressure compensation valve comprising a check valve portio... | 07/29/1997 |
| 5484025 | Locking row marker hydraulic cylinders in retracted transport condition The invention is directed to a foldable agricultural implement frame having an extended working configuration and a folded transport configuration. The frame comprises a center section and two wing section. Each of the wing sections have row markers that ... | 01/16/1996 |
| 5473828 | Structure of a clamshell bucket and a hydraulic control circuit To excavate sticky soil such as clayey soil, left and right buckets of a clamshell bucket are slightly inclined, thereby reducing the force to pull the buckets from a hole. The clamshell bucket includes left and right buckets which are closable, thereby h... | 12/12/1995 |
| 5458049 | Two-stage externally adjustable control valve Material such as trash or refuse is packed in a container by opposed hydraulic packing and ejecting cylinders. Each cylinder is controlled by a hydraulic control valve with the control valve controlling the ejecting cylinder being, in effect, operated by ... | 10/17/1995 |
| 5433076 | Hydraulic control valve apparatus and hydraulic drive system A hydraulic control valve apparatus including a flow control valve having a pair of variable throttles, a feeder passage, a pair of load passages, directional control valve devices comprise a seat valve having a seat valve body movably disposed in a housi... | 07/18/1995 |
| 5415199 | Unit for controlling a plurality of hydraulic actuators Hydraulic actuators are fed by a single flow-rate generator, each being connected to it through a proportional directional valve, the unit including a device for detecting the highest of the pressures prevailing upstream of the throttle provided by a cont... | 05/16/1995 |
| 5335499 | Multiple hydraulic actuators with series/parallel operation The present invention includes a method for improving operating efficiency of a hydraulic actuator loop and an improved hydraulic actuator loop. The method includes transferring hydraulic fluid between a first and a second hydraulic actuator when the actu... | 08/09/1994 |
| 5279121 | Flow control valve with pilot operation and pressure compensation A pilot-actuated, pressure-compensated flow and directional control valve assembly (11) is provided in which a main valve spool (95) is positioned in response to a pressure differential between a pilot chamber (119) and a reaction chamber (117). Flow of f... | 01/18/1994 |
| 5115722 | Solenoid-operated selector valve There is disclosed a solenoid-operated selector valve adapted for control of hydraulic clutches such as of a tractor. The selector valve has four ports and can assume two positions. The selector valve includes a spool having an axially extending hole. A p... | 05/26/1992 |
| 5115721 | Change-over valve A change-over valve including a valve housing defining an inlet port for receiving fluid from a fluid pressure supply, a first outlet port for feeding operating fluid to a first fluid responsive actuator, a second outlet port for feeding operating fluid t... | 05/26/1992 |
| 5107753 | Automatic pressure control device for hydraulic actuator driving circuit An automatic pressure control device built in a hydraulic actuator driving circuit for driving a plurality of actuators of a construction machine or the like by a single hydraulic pump through respective pilot changeover valves is provided for automatical... | 04/28/1992 |
| 5048396 | Bypass valve In the neutral position of a directional control valve in which the connection of the constant pump to the consumer is interrupted the entire delivery of the constant pump is led via a bypass valve to the tank. According to the invention the regulating ra... | 09/17/1991 |
| 4976187 | Fast sweep power cylinder for refuse trucks Power fluid from a pump are provided through one power fluid branch conduit to an extend port for activating the smallest cylinder of a multi-stage packing cylinder and fluid is conducted through a second extend branch conduit to a second port which provi... | 12/11/1990 |
| 4844685 | Electronic bucket positioning and control system An electronic bucket positioning and control system for a vehicle of the type including a hydraulically controlled boom assembly and bucket. The bucket positioning and control system can operate in a bucket positioning mode, bucket return to position mode... | 07/04/1989 |
| 4833971 | Self-regulated hydraulic control system A self-regulating hydraulic control circuit for controlling the flow of fluid to and from the cylinder of a double-acting hydraulic motor employs two pumps, one of which supplies fluid at a relatively high pressure and low displacement while the second pu... | 05/30/1989 |
| 4750405 | Vibration and shock isolation apparatus In a sensitive analytical instrument having an optical bench carried by a base member, new and improved vibration and shock isolation apparatus which includes three spaced pneumatic mounts interposed between the optical bench and the base member to provid... | 06/14/1988 |
| 4632261 | Hydraulic circuit for self-undecking crane A hydraulic circuit for a self-undecking crane having retractable legs with extendable jacks for elevating and supporting the crane upper. Hydraulic cylinders move the legs between a retracted position and an extended position in which the jacks are engag... | 12/30/1986 |
| 4508012 | High pressure hydraulic systems In a high pressure hydraulic system a slave unit is supplied with fluid from a source through a control valve assembly. The assembly has a valve mechanism to control flow between ports communicating with the source and slave unit. The valve mechanism has ... | 04/02/1985 |
| 4354797 | Front loading hydraulic excavator An excavator including a boom pivotally moved by boom cylinders, an arm pivotally moved by an arm cylinder and a bucket pivotally moved by bucket cylinders further includes a boom detecting device detecting a pivotal displacement of the boom and producing... | 10/19/1982 |
| 4258886 | Variable stack feeder with hydraulic control Apparatus and method for cutting and feeding foliage material from a stack, the apparatus comprising a wheeled vehicle, for example a wagon pulled by a tractor, capable of being displaced along the ground, a tiltable bed thereon disposed in a parallel pos... | 03/31/1981 |
| 4237688 | Hydraulic synchronous driving mechanism A hydraulic synchronous driving mechanism provided with at least two piston-cylinder assemblies, each having a bottom chamber and a ring chamber and the piston rods of which engage a counterdevice adapted to synchronously load piston rods mutually in oppo... | 12/09/1980 |
| 4177000 | Rotatable load clamp adapted for selective load positioning in response to selective rotational positioning of clamp A selectively rotatable load clamp for lift trucks, having a pair of openable and closable clamp arms. The clamp arms are capable of shifting the position of a load relative to the lift truck by movement of the clamp arms in unison, by which the load may ... | 12/04/1979 |
| 4166506 | Controlling apparatus for bulldozer blade A controlling apparatus for bulldozer blade in which the control is carried out automatically or manually. The apparatus comprises an electromagnetic valve for controlling a cylinder of the bulldozer blade, a switch for changing the control of the bulldozer ... | 09/04/1979 |
| 4134505 | Work vehicle with a fluid pressure circuit system A work vehicle with a fluid pressure circuit system comprising an actuator pump, a work equipment mounted on the vehicle and adapted to swivel on a vertical axis, a fluid pressure circuit connected to the actuator pump to actuate the work equipment, and a... | 01/16/1979 |
| 4107923 | Load responsive valve assemblies A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump control responding to highest system load. Each direction flow control valve is equipped with a load responsive pre... | 08/22/1978 |
| 4099449 | Electromagnetic bucket positioner for loader vehicles An electromagnetic bucket positioner having an electromagnet disposed to selectively latch, when energized, a directional control valve of a bucket positioning system. The electromagnet is arranged in such a manner that only when a manually operable contr... | 07/11/1978 |
| 4099379 | Load responsive fluid control system A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump control responding to highest system load. Each direction flow control valve is equipped with a load responsive pre... | 07/11/1978 |
| 4094228 | Fluid system having load pressure equalizing valve assemblies A fluid system has first and second hydraulic jacks each having a load supporting end connected to a source of fluid through a control valve. First and second pilot operated valve assemblies are positioned between the control valve and the load supporting... | 06/13/1978 |
| 4093092 | Load limiting device The invention is concerned with an improvement in a load lifting apparatus which comprises a primary load member pivotally mounted about a generally horizontal axis on a frame, a tilt cylinder and a tilt piston movable relative to one another pivotally co... | 06/06/1978 |
| 4009983 | Hydraulic mold clamping mechanism for injection molding machine A mold clamping mechanism for an injection molding machine characterized in that a relatively large mold clamping cylinder has a passage in its piston intercommunicating the head and rod ends of said mold clamping cylinder during stroking of said piston b... | 03/01/1977 |
| 4007664 | Hydraulic booster A hydraulic booster has its piston located in a normal passive position so that hydraulic fluid supplied to the cylinder through an inlet port enters the cylinder on both sides of the piston. Normally open valve means establishes communication through the... | 02/15/1977 |
| 3993158 | Device for limiting in a contact-free manner the movement of hydraulically operable mechanical parts A device for limiting in a contact-free manner the movement of hydraulically operable mechanical elements, especially for bucket wheel loaders. The device includes a front carriage and a rear carriage. One approaching initiator each is provided on that po... | 11/23/1976 |
| 3990349 | Device for effecting translational movement of a machine A hauling device, for example for a mining machine, has two clamping elements which grip on ramps each of which elements is attached to an operating rod of a hauling jack. The jacks are operated alternately, in conjunction with the clamping elements to ad... | 11/09/1976 |
| 3977100 | Hydraulic control system for elevating scraper An elevating scraper comprises a bowl which can be hydraulically raised and lowered, a motor-driven elevator which can be hydraulically raised and lowered, an ejector hydraulically movable forwardly from an aft position to eject material from the bowl and... | 08/31/1976 |
