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8939062 Double-acting hydraulic cylinder with integrated gas spring action and method for making the same  
The invention relates to a method for constructing a gas-filled double-acting hydraulic cylinder (1) with gas spring action, comprising: —a cylinder sleeve (3) with a cylinder bottom (3a) and...
8864102 Actuator  
An actuator for actuating a plunger of a valve is provided. The actuator has an inlet and includes first and second hollow caps. A main actuation assembly is provided between the caps. The main...
7823803 Integrated breakaway cylinder and method for constructing a boom assembly  
An integrated breakaway cylinder for controlling a boom of a self-propelled sprayer and method for constructing a boom assembly is disclosed in the present application. The integrated breakaway...
7338017 Methods and apparatus for vibration and buffet suppression  
Apparatus and methods for hybrid actuation and suppressing vibration are disclosed. In one embodiment, a hybrid actuator includes a first actuator and a second actuator linked to move a component...
7175001 Apparatus for driving raising and lowering of lift for tower type storehouse  
There is provided an apparatus for driving the raising and lowering of a lift for a tower type storehouse so as to supply a force for vertically operating the lift carrying goods to storerooms on...
6981440 High-speed cylinder apparatus  
A movable cylinder (20) is provided with an inner cylinder chamber (21) and an outer cylinder chamber (31) which surrounds the inner cylinder chamber. The inner cylinder chamber is provided with...
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...
6116140 Telescoping system with multi-stage telescopic cylinder  
The telescoping system includes a first and second fluid motor. The first fluid motor includes a first cylinder and a second cylinder nested in the first cylinder. The second fluid motor includes...
6029559 Telescoping system with multiple single-stage telescopic cylinders  
The telescoping system includes a first fluid motor and a second fluid motor. The first fluid motor includes a first extension chamber and a first retraction chamber, and the second fluid motor...
6005395 Method and apparatus for sensing piston position  
A system for determining the position of a piston moveable within a cylinder, or of an implement or joint, is disclosed herein. Electromagnetic (EM) bursts such as ultra-wideband or frequency...
5953967 Fluid-operated cylinder-piston unit, and a tool provided therewith  
A fluid-operated cylinder-piston unit has a cylinder forming an inner space, a piston unit movable in the inner space and including a first piston and a second piston movable relative to one...
5799563 Piston and cylinder clamping motor  
A valve spring compressor apparatus for removing and installing valve springs on automotive racing engines includes a valve seat and a compressor pump assembly. The valve seat is placed between...
5613418 Multiple-stage hydraulic cylinder  
A multiple-stage hydraulic cylinder for shifting loads by exerting different forces over different distances, in which a hollow-piston cylinder is provided with a hollow piston rod. The hollow...
5558005 Multi-section actuator  
Actuator (1) adapted to be actuated by pressurized fluid as shown for example in FIG. 3, having a plurality of piston-cylinder units (A, B, C, D, E, F) arranged one behind the other and...
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...
5390586 Self-bleeding hydraulic cylinder  
A self-bleeding multi-stage or single-stage hydraulic cylinder system is disclosed which automatically bleeds entrapped air from within the cylinder each time the cylinder is cycled. The...
5322004 Telescoping fluid actuator  
A telescoping fluid actuator assembly including a housing having a plurality of concentrically disposed fluid actuators disposed therein. Each fluid actuator includes a cylindrical housing...
5305605 Hydraulic piston and cylinder unit  
An hydraulic piston and cylinder unit with a piston rod and first and second cylinders. The piston rod extends into the first cylinder, and the first cylinder extends into the second cylinder. The...
5263402 Lift/slider apparatus  
This invention relates to a displacing apparatus comprising a plurality of concentric tubular members concentrically disposed about a central axial member. These concentric members define a...
5247872 Multi-stage hydraulic actuator  
A multi-stage hydraulic actuator including a cylinder body having an outer cylinder and an inner cylinder provided in the outer cylinder, first and second pistons inserted in the outer cylinder to...
5111733 Multiple stage hydraulic jack for use with telescopic jib  
This invention relates to a multiple jack incorporating at least three elements, viz. two pistons and two cylinders which define large and small chambers of a first cylinder, and large and small...
5046397 Electrohydraulic and hydromechanical valve system for dual-piston stroke controller  
An electrohydraulic system for control of a variable output pump includes a microprocessor-based controller receiving inputs from condition sensors coupled to the pump and command inputs from a...
4936193 Protective device  
The present invention provides a protective device for a working member, such as the piston rod of a piston and cylinder actuator, which is arranged at least partly in a receiving member and is...
4930402 Hydraulic lifting cylinder-piston unit  
A hydraulic cylinder-piston unit comprises primary cylinder-piston unit with an integrated position regulation and with a primary cylinder and a primary piston movable in the primary cylinder, two...
4928488 Hydraulically-operated support device for semitrailers  
A hydraulically-operated support device for semitrailers is disclosed comprising a hydraulic cylinder semitrailer support and a pump subassembly having three independently operable pumps for...
4881211 Multiple frequency range hydraulic actuator  
A multiple frequency range hydraulic actuator includes a low frequency cylinder with a low frequency actuator piston within. The low frequency piston operates as a high frequency cylinder having a...
4869458 Liquid distribution valve  
An apparatus for feeding a liquid from a reservoir is provided. A distribution duct that defines a channel extending from the reservoir is provided that is in fluid communication with a feeding...
4852464 Two-stage telescoping hydraulic cylinder  
To allow a telescoping cylinder that is ordinarily operated in a fixed sequence to also be operated in a simultaneous mode, the first stage (12) of the cylinder is provided with an end plate...
4751821 Digital linear actuator  
A digital linear actuator includes a plurality of digital actuator cells each connected to the next in sequential fashion. Each of the digital actuator cells contracts or expands a predetermined...
4741246 Stage selectable telescopic cylinder assembly  
A multiple stage telescoping cylinder assembly, which provides full stage selection capability without the need for external hoses or reels, comprises a base; an inner cylinder attached at its...
4733598 Telescopic jib  
A telescopic device for use in a crane jib, forklift truck, lighting tower, access platform or the like, having at least two extandable sections extending from a base section, in which each said...
4727781 Supercharged power tongs  
A supercharged power tongs for making up or breaking apart drill tools used in oil or geologic drilling engineering is designed to take the place of B-type tongs. Supercharger and assist fluid...
4726281 Hydraulic cylinder  
A multistage cylinder having a partial force mode, a full force extended mode, and a full force retracted mode, and having an outer cylinder closed at one end and open at the other, one or more...
4707992 Microwave radiating antennae hydraulic adjustment apparatus and method  
A hydraulic adjustment apparatus for use in adjusting and positioning microwave radiating antenna or any other treatment monitoring device is disclosed. The hydraulic adjustment apparatus,...
4691617 Multi-section sweep cycle compaction cylinder  
A triple action, multi-segment, telescoping hydraulic ram comprising a plurality of coaxially nested, extensible cylinders adapted to be selectively extended or retracted, and a pair of lower...
4651906 Arrangement for applying adhesive medium, particularly for leather and shoe articles  
An arrangement for applying an adhesive medium, particularly for leather and shoe articles, has an adhesive medium applying nozzle and a nozzle needle member arranged to close and to open the...
4575976 Extension and retraction system for boom apparatus  
An extension and retraction system for a multiple section, telescoping boom apparatus of the type utilized for raising and lowering a work platform or basket. The innermost longitudinally movable...
4559895 Positioning device  
A positioning device capable of positioning a rod with a first piston fixed thereto into one of four positions selectively by means of a second piston disposed within a chamber A formed in a...
4549578 Coded fluid control system  
A fluid control system 10 and selector valve 24 for use therein, for controlling a plurality of fluid actuated elements 12, such as valve operators. The fluid actuated elements are controlled from...
4531450 Multi-stage actuator  
A two-stage actuator comprises a pair of axially aligned bellows molded from a thermoplastic material and connected at their adjacent ends by a molded link section integral with the bellows. The...
4470524 Apparatus for controlling discharge from a silo  
Apparatus for controlling discharge from a silo, comprising a device mounted internally of a discharge opening for flowable material and forming with that opening a flow path for material through...
4460324 Shot cylinder controller for die casting machines and the like  
A shot cylinder controller for injection molding machines comprises a valve connected with one side of the shot cylinder and including a valve head which is movable with respect to a seat. The...
4457564 Tensioning device for endless chain  
A tensioning device, especially for endless chains of a tracklaying vehicle, is provided which is formed as a working cylinder which is connected to a pressure-regulated hydraulic source and whose...
4392792 Lineal multi-cylinder hydraulic pumping unit for wells  
The present invention provides a hydraulic pumping unit, which is capable of pumping oil and other fluids from the downhole of a well. The pumping unit includes a frame and multi-cylinder system...
4391092 Multiple position digital actuator  
An actuator particularly adapted to control a plurality of bleed air valves of a gas turbine engine is disclosed. The actuator comprises n solenoid pilot valves where 2n is the number of actuation...
4358988 Control elements for gearbox ratio selectors in heavy vehicles  
A control element is provided for a gearbox ratio selector in a heavy vehicle of the type in which the gearbox ratio selector is operated by means of a pair of pneumatic cylinders having opposite...
4336840 Double cylinder system  
Disclosed is a system including two or more fluid pressure piston-and-cylinder assemblies. The cylinders are linked in pairs so that retraction of both piston rods reduces the length of the pair...
4246990 Remote control system for an automotive transmission in an earth-moving vehicle  
A remote control system for an automotive transmission in an earth-moving vehicle which includes a fluidic variable frequency oscillator having a variable feedback loop controlled by a quadrant...
4241632 Blanking machine for blanking holes in sheet of metal  
A blanking machine for blanking holes in a sheet of metal in a zigzag fashion comprising a bolster, a pair of rails, fixedly secured to the bolster extending in a direction right angles to the...
4206684 Hydraulic jack  
A hydraulic jack suitable for powering a large load such as an elevator or a drawbridge. In a first embodiment the hydraulic jack telescopes at a uniform rate over its entire distance of extension...

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