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Match Document Document Title
8938339 Method for activating a unit of a transmission  
A method of actuating an assembly of a transmission, with which are associated a plurality of actuators with whose help the assembly can in principle be actuated, such that out of the actuators...
8851112 Dual configuration hydraulic manifold apparatus and system  
The invention relates to a hydraulic manifold apparatus and system, connectable to a dual stage motor, for use in the topdrive of drilling operations. The hydraulic manifold is switchable between...
8820061 Method for actuating a hydraulically movable working element of a working equipment, and a working equipment  
The invention relates to a method and to a working equipment for actuating a hydraulically movable working element (24), which is provided on a main body (14) of a working equipment (11),...
8528461 Force actuator  
Actuator arrangements are disclosed. An actuator arrangement can include a first fluidic-based actuator device designed to exert a first force on a first location of a body associated with the...
8161741 System and methods for optimizing efficiency of a hydraulically actuated system  
Systems and methods for efficiently operating a hydraulically actuated device/system are described herein. For example, systems and methods for efficiently operating a gas compression and...
8051764 Fluid control system having selective recruitable actuators  
A fluid control or actuation system providing selective recruiting of actuators antagonistic to one another to provide variable output power, such as that used to drive a load. The actuators are...
8033210 Device for managing the displacement of a hydraulic motor or a group of hydraulic motors  
A motor having two series of distribution ducts each having two groups of ducts. The displacement selector is able to occupy a large displacement position in which the first groups of distribution...
7614226 Hydraulic transmission  
A hydraulic transmission system features a first hydrostatic motor (1) and a second hydrostatic motor (4), which are connected to an output shaft (3) by way of a compound transmission, and which,...
7475538 Digital Hydraulic system  
A digital hydraulic system including a hydraulic source, a housing and a transtatic bridge. The transtatic bridge being substantially contained within the housing. The transtatic bridge being in...
7090475 Hydraulic control circuit for a hydraulic engine with at least two speeds  
A hydraulic control circuit for a radial piston engine with two speeds. The changeover between the speeds takes place through the alteration of the absorption volume, the delivery side being...
6817067 Tandem electrohydrostatic actuator  
A tandem electrohydrostatic actuator (70) broadly includes a first piston (22) operatively arranged in a first cylinder (23), and a second piston (24) operatively arranged in a second cylinder...
6817859 Drive device for a movable part, especially a mold closure device for an injection molding machine, and method for operating such a drive device  
A drive for a movable part, such as a mold closure platen, includes two hydraulic cylinder-and-piston units defining first and third pressure chambers in a first of the hydraulic units and...
6609368 Automatic downshift and override control for a transmission  
The present invention includes a hydrostatic transmission system that has a control device that is selectable to send a speed signal to a motor for driving an output at a predetermined speed. A...
6543331 Hydraulic lifting device  
A hydraulic lifting device provides a lifting of the massive objects, having a complex geometric form and includes a support plate rigidly connected to the plungers coupled with the body carrying...
6318235 Hydraulic motor cylinder-capacity selector for avoiding jarring when switching from one cylinder capacity to another  
A cylinder-capacity selector for a hydraulic motor having at least two active operating cylinder capacities and comprising having at least two main ducts. The selector includes three ports and...
6244560 Blowout preventer ram actuating mechanism  
A ram actuating mechanism 20 for a blowout preventer 10, the ram actuating mechanism 20 including a hydraulic booster for enhancing the ram closing force. The ram actuating mechanism 20 may be...
6145307 Method and device for controlling a hydraulic installation of a utility vehicle  
What is disclosed is a method for controlling a hydraulic cylinder acting against a load, and a hydraulic installation of a utility vehicle operating in accordance with this method, wherein the...
6094910 Apparatus and method for raising and lowering a piston in a piston cylinder arrangement in a derrick  
Disclosed is an apparatus for a derrick, including hydraulic piston/cylinder arrangements for raising and lowering a yoke travelling on guide rails attached to the derrick. A hydraulic system...
6035635 Hydraulic quick lifting unit of a jack  
The invention relates to an improved hydraulic quick lifting unit used in a jack, especially to improvements made on the valves of the hydraulic system, a fastener assembly and an oil return tube...
6026730 Flow control apparatus in a hydraulic circuit  
For supplying a large volumetric flow into a particular hydraulic actuator without requiring a directional control valve to be large-sized and without making large a pressure difference between a...
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...
5878569 Energy conversion system  
The energy conversion system of the subject invention converts the energy from a source of pressurized fluid, such as a free-piston engine and a storage accumulator, to a work system at various...
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....
5839350 Means and method for preparing a container for recycling  
A press assembly includes a hydraulic cylinder assembly having first and second chambers and respective piston and rod assemblies therein. The rod of the second assembly is arranged to enter the...
5836400 Three speed circuit for hydraulic tool  
A hydraulic tool having a ram or other working element propelled by pressurized fluid. The tool has a lever which is squeezed to develop fluid force in a pump. The fluid circuitry automatically...
5836231 Radial-piston hydraulic motor and method for regulation of a radial-piston hydraulic motor  
A radial-piston hydraulic motor and method for regulating a radial-piston hydraulic motor including one or more cylinder groups, each cylinder group having piston mechanisms that move radially...
5819632 Variable-speed rotating drive  
A variable-speed rotating drive is provided. A drive shaft terminates in a hreaded piston that is received in an internally threaded cylinder. A plurality of linear actuators are distributed...
5730041 Hydrostatic assembly with controlled spin  
A hydrostatic bridge including two hydraulic motors each having two distinct operating cylinder capacities, both motors sharing an overall casing. The bridge has four main ducts of a first type...
5724878 Hydraulic operating mechanism for a convertible top  
In a hydraulic operating mechanism for a convertible top, a pressure sensor (12) is incorporated into a common pressure circuit (P) of the hydraulic cylinders (1 through 4) and connected with a...
5697285 Actuators for simulating muscle activity in robotics  
An apparatus generates power at micro-scale dimensions that is sufficient to simulate the muscle activity required by the joints of robotic fingers. The apparatus includes a bellows device for...
5644915 Control system for a hydraulic press brake  
A control system for controlling the movement of the ram of a press or press brake of the type having one or two main cylinders with pistons operatively attach to the ram. The control system...
5615593 Method and apparatus for controllably positioning a hydraulic actuator  
A system and method for controllably positioning a hydraulic actuator which is operably connected to a control surface includes at least one main control valve for controlling the hydraulic...
5586482 Two-stage fluidic actuator  
A fluidic actuator includes dual-element, differential area pistons consisting of a power piston and an extender piston that are mounted in a double-chamber cylinder. A spring-loaded throttling...
5558000 High speed and high load cylinder device  
A high speed and high load cylinder device is constructed by connecting a piston of a high speed cylinder (1) having a smaller pressure receiving area and a piston of a pressurizing cylinder (2)...
5533435 Fluid cylinder assembly  
A first cylinder of a smaller diameter and a second cylinder of a larger diameter are connected in a coaxially intercommunicating state. A first piston of a smaller diameter which is hermetically...
5522212 Rod equal displacement cylinder in a rapid transfer and feed system  
A single rod three chamber fluid cylinder is driven in an initial rapid advance forward stroke by a main pump, pumping fluid through a proportional directional control valve to act against a first...
5488895 Clutch slave cylinder  
A clutch hydraulic slave cylinder comprising a cylinder body, a primary piston sealingly reciprocable relative to the body and co-operating with the body to form a first fluid chamber within said...
5440968 Variable force cylinder device  
A variable force cylinder device with a piston reciprocated by a pressurized fluid in a cylinder chamber, in which the piston has a large-diameter portion and a small-diameter portion, the...
5435228 Pneumatic transformer  
A fluid operated device has a high pressure fluid cylinder, a low pressure fluid cylinder and a plurality of valves which operate to fluidically connect the two cylinders to provide a compound...
5398741 Method and apparatus for rotary-cutting a timber in a veneer lathe  
A method and apparatus for rotary-cutting a timber to peel off a veneer by a cutting knife from the outer periphery of a timber while rotating the timber around its longitudinal axis. The timber...
5361680 Pressure-intensifying type fluid pressure cylinder  
In a pressure-intensifying type fluid pressure cylinder, an auxiliary cylinder chamber is provided outside a rod cover, a pressure intensifying piston is axially and slidably disposed on the outer...
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...
5319933 Proportional speed control of fluid power devices  
A hydraulic circuit for controlling the speed of multiple hydraulic fluid power devices when the flow demand of the devices exceeds the flow capacity of a pressure source supplying hydraulic fluid...
5249502 Double action, dual speed and force hydraulic actuators  
A hydraulic fluid Pressure-operated actuator comprises a first cylinder assembly having an output which operatively carries a second cylinder assembly such that an axial output force is effected...
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...
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...
5235898 Actuator with wear compensating chamber  
An actuator for a friction clutch having a diaphragm includes coupling means comprising a first part associated with the clutch actuating linkage, and a second part associated with the actuator...
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...
5209154 Dual area brake actuation piston mechanism  
The dual area brake actuation piston mechanism (10, 110) comprises a piston housing (12, 112) having therein a first bore (30, 130) disposed coaxially about a separate second bore (40, 140). A...
5199658 Dual-force hydraulic drive for a demolition tool  
A demolition tool includes a carrier body and two tool blades mounted thereon to define a tool mouth for receiving material to be crushed. The demolition tool further has a hydraulic cylinder...

Matches 1 - 50 out of 253 1 2 3 4 5 6 >