Class / Patent application number | Description | Number of patent applications / Date published |
267124000 | Piston | 38 |
20080246198 | GAS SPRING ASSEMBLY AND METHOD - A gas spring assembly includes a first end member, a piston assembly and a flexible wall extending therebetween. The piston assembly includes a piston body receiving a portion of the flexible wall and a retainment ring for retaining the flexible wall on the piston body. A method of assembly is also included. | 10-09-2008 |
20080265478 | WIND TURBINE SYSTEMS DAMPERS - A damper for a structural tower having a space frame construction for high elevation and heavy load applications is disclosed, with particular application directed to wind turbines. The structural tower includes one or more dampers for damping resonant vibrations or vibrations generated by non-periodic wind gusts or sustained high wind speeds. The wind tower damper includes a fluid damper comprising a housing, elastomeric chamber, piston and damping fluid, wherein relative motion between the first and second structural members drive the fluid moving piston to pump the fluid and thereby dissipate unwanted motion in the tower. | 10-30-2008 |
20080284073 | VARIABLE SPEED GAS SPRING - A gas spring having a cylindrical housing has multiple regions through which a piston moves. A piston rod extends through one end of the cylindrical housing. One region is pressurized with an inert gas and at least a second region includes a multiple viscosity fluid, such that, as the piston moves under the influence of the pressurized gas, the piston rod moves at a variable speed. In one embodiment, the second region includes two layers of different viscosity oils with the oil adjacent the piston, having a lower viscosity and density than the second layer of oil. In other embodiments, the second region has a substantially continuously varying viscosity fluid. | 11-20-2008 |
20080290571 | Air Spring - An air spring has three air spring spaces ( | 11-27-2008 |
20090033009 | Self-pumping hydropneumatic spring-damper unit - A self-pumping hydropneumatic spring-damper unit with internal leveling control is provided. The spring-damper unit has an oil-filled work cylinder under pressure by gas cushions. A damping piston is displaceable in the work cylinder and arranged at the end of a hollow piston rod whose hollow space serves to receive a pump by means of a pump rod fastened to the work cylinder. Damping medium is sucked out of a reservoir space when the piston rod moves outward and is conveyed into the work space when the piston rod moves inward. The pump rod has a control opening and, at a distance therefrom, an outlet bore for pressure equilibrium between work spaces in the work cylinder. At least one pressure-dependent throttle point is provided in the pump space between the high-pressure and low-pressure gas cushions. A first flow connection in the pump rod provided with at least one check valve connects the low-pressure gas cushion to the pump space. A second flow connection having the throttle point is connected to the work space by the outlet bore. | 02-05-2009 |
20090065991 | Self-Pumping Hydropneumatic Spring Strut - A self-pumping hydropneumatic spring strut with internal leveling control, particularly for motor vehicles, has an outer tube having an oil-filled high-pressure work space in the work cylinder, which high-pressure work space is under pressure by at least one gas cushion which is arranged in a high-pressure chamber and acts as a spring, a second work space on the piston rod side, and a piston which is supported by a hollow piston rod and which is axially displaceable in the work cylinder in a sealed manner, a piston pump which is driven by the spring movement of the vehicle and pumps oil out of a low-pressure chamber into the work space connected to the high-pressure chamber and which comprises a pump rod and a pump cylinder which is formed by the hollow piston rod, and the high-pressure chamber can be connected to the atmosphere by a flow connection which is arranged in the piston rod guide and has a closing element. The piston rod is sealed in the piston rod guide by means of at least two seals which are arranged one behind the other axially. A flow connection extends from between two adjacent seals into the low-pressure chamber. The flow connection is acted upon by a check valve which passes damping medium only in direction of the low-pressure chamber. | 03-12-2009 |
20090096140 | Gas Spring - A stopper member forms a part of a lock mechanism in a gas spring. A rod body has a base end side inserted into a cylinder body, with the rod body movable into and out of the cylinder body and urged in an outward direction with respect to the cylinder body by the pressure of a gas sealed inside the cylinder body. A stopper member receives a head end portion of the cylinder body inside the stopper member. A projecting portion of the stopper member is located on an end face opposite an end portion of the cylinder body. The stopper member can be shifted manually between a first position that allows contraction of the rod body into the cylinder body, and a second position in which such contraction is prevented, thereby locking the gas spring in an extended state. | 04-16-2009 |
20090096141 | Gas Spring - A gas spring includes a rod body that has a base end side movable into and out of a cylinder body. The rod body is urged in a direction outward of the cylinder body by pressure from a gas sealed inside the cylinder body. A cylindrical cover body includes a base end portion connected to a distal end portion of the rod body that projects outside of the cylinder body. An end portion of the cover body receives a head end portion of the cylinder body inside a cylindrical cover member at an end portion of the cylinder body. The cover member covers a portion of the spring that would otherwise be exposed to the air between the end portion of the cover body and the end portion of the cylinder body when the cylinder body is contracted inside the cover body. | 04-16-2009 |
20090146351 | LOAD COMPENSATING HYDRAULIC RATE CONTROL - A rate control device includes an outer cylinder defining an interior chamber having a longitudinal axis and containing a hydraulic fluid. A piston head mounted to a proximal end or a piston rod is slidably positionable within the interior chamber. A rate control valve is disposed within an interior cavity of the piston head coaxially with the longitudinal axis of the interior chamber of the cylinder. The rate control valve includes a variable flow rate orifice and a fixed flow rate orifice disposed in series relationship with respect to fluid flow through the rate control valve. | 06-11-2009 |
20090236783 | Gas Spring - A gas spring includes a center longitudinal axis and a closed first end, a cylinder filled with gas under pressure, a piston displaceably arranged in the cylinder and dividing the cylinder into a first work chamber near the closed end and a second work chamber remote of the closed end, a piston rod passing through the second work chamber and guided out of the cylinder through a guiding and sealing device, and a mechanical blocking device whose action depends upon the internal pressure. The piston has a piston chamber connected to the outside of the cylinder. A first safety element and a second safety element form the mechanical blocking device. The first safety element connects the first work chamber to the outside via the piston chamber when the pressure in the cylinder is too low and brings the second safety element into contact with the inner wall of the cylinder. | 09-24-2009 |
20100127438 | PLUNGER PISTON - A plunger piston for an air spring. The plunger piston is designed as a hollow body and has a base to which an encircling casing part is indirectly or directly coupled. The plunger piston has, at its cover region which faces away from the base, a connecting edge for a bellows and at least one air passage opening. In order to produce this type of a plunger piston in a simple manner with little structural expenditure, the hollow body of this invention has a pot-shaped lower part which forms the base and the casing part. An upper part is placed onto the lower part and is connected to the lower part in an air-tight fashion, and the upper part has the connecting edge. | 05-27-2010 |
20100258986 | DAMPING DEVICE FOR MOVABLE FURNITURE PARTS - A damping device for movable furniture parts includes a base, a movable member defining a path, a housing movably connected to the path and including a space and an opening which communicates with the space, a damper located in the space and including a cylinder and a piston rod which has one end inserted into the cylinder and the other end of the piston rod extends from the cylinder, a first threaded member connected to the cylinder including, a second threaded member connected to the first threaded member and located corresponding to the opening of the housing, an adjustment member movably connected between the base and the movable member. When rotating the second threaded member, a distance between the housing and the movable member is adjusted. When the adjustment member is adjusted, the relative distance between the base and the movable member is adjusted. | 10-14-2010 |
20120098173 | Rebound Control Enhancement For Air Springs - An air spring including a piston, and a flexible sleeve connected to the piston. The flexible sleeve forms a compression chamber and includes a lobe that rolls along a surface of the piston during compression of the flexible sleeve. The flexible sleeve is connected to the piston by an inverted crimp connection. A crimp ring used providing the inverted crimp connection includes a rebound travel limiter around which the lobe is formed. | 04-26-2012 |
20120228812 | COVER OPENING-AND-CLOSING SUPPORT MECHANISM EMPLOYING GAS SPRING, AND AUTOMATIC TRANSACTION APPARATUS - A cover opening-and-closing support mechanism is provided that reliably locks a gas spring, and in which a rod section of a gas spring is not damaged by a stopper portion. The cover opening-and-closing support mechanism includes: a gas spring equipped with pivot points at both end portions and including a cylinder section and a rod section; a stopper portion rotatably provided at the pivot point at a first of the end portions, the stopper portion making contact with the cylinder section when the gas spring has been extended so as to lock the gas spring; a gas spring stopper including a limiter portion that makes contact with the cylinder section before the stopper portion makes contact with the rod section; and a release handle portion for releasing the locking, provided at the gas spring stopper on substantially an opposite side to the stopper portion, such that the gas spring stopper swings towards substantially the opposite side to the stopper portion due to a weight of the release handle portion. | 09-13-2012 |
20120306132 | GAS SPRING EQUIPPED WITH IMPROVED SEALING MEANS - A gas spring is provided that can comprise at least one rod, at least one guide bushing, and at least one dynamic seal. The rod can slide inside at least one cylinder containing gas. The dynamic seal can be interposed between the rod and the cylinder. In some embodiments, the guide bushing can be formed from a first mixture comprising a thermoplastic polymer and a solid lubricant filler. Further, in some embodiments, the dynamic seal can be formed from a second mixture comprising a thermoplastic elastomer and a mineral filler or a powder of thermoplastic polymer. | 12-06-2012 |
20130026687 | GAS SPRING WITH DYNAMICALLY CONTROLLABLE DAMPING - A gas spring suitable for controlling motion of a linear power generator or a linear machine. According to an embodiment, the gas spring comprises a cylinder and a pressure control network. The cylinder comprises two pistons in a coaxial arrangement and three controllable gas volumes or chambers. Each of the pistons includes a piston rod or shaft that is configured to couple to respective drive shaft(s) on the linear power generator. The pressure control network is operatively coupled to each of the three gas volumes and configured with a controller to control the gas pressure in the gas volumes to vary the resistance of the pistons to the movement of the respective drive shaft(s) on the linear power generator. According to another embodiment, the cylinder comprises one piston and two controllable gas volumes or chambers operatively coupled to the pressure control network. | 01-31-2013 |
20130119590 | LOCKABLE FLUID STRUT WITH FRANGIBLE LOCK - A fluid strut includes a frangible locking member including a generally cylindrical locking pin mounted to an outer cylindrical housing of the strut and extending radially inwardly toward a gas spring cylinder. The locking pin is movable between operative and inoperative positions. In the operative position, the spring-loaded frangible locking pin extends into engagement with the gas cylinder and can advance radially to a locking position once the outer housing extends beyond the location of the gas cylinder. In an inoperative position, the locking pin is held in a retracted position. The end of the locking pin has a reduced diameter, such that, if a purposeful force is placed upon the strut when in a locked position, the pin can shear, allowing the rod to be retracted within the cylinder and the closure member to be closed without damage. | 05-16-2013 |
20130307203 | GAS STRUT ASSEMBLY WITH AN INTERNAL DETENT MODULE - A gas strut assembly includes a housing defining an interior space. A rod is coupled to the housing, and is slideably moveable between an extended position and a retracted position. A flexible member is secured in position relative to the housing. A rigid member is coupled to and moveable with the rod. The flexible member includes at least one displaceable member that moves radially away from the central axis in response to a second radial force component of a closing force when engaged by the rigid member moving from the extended position into the retracted position. The flexible member includes a multi-layered structure that changes shape in response to a change in temperature to affect the magnitude of the second radial force component required to move the displaceable member. | 11-21-2013 |
20130320603 | PISTON FOR AN AIR SPRING - The invention relates to a piston for an air spring, wherein the piston has a piston skirt, wherein the outer contour of the piston skirt can be variably changed in order to vary an air spring characteristic of the air spring. | 12-05-2013 |
20140167337 | AIR SPRING PISTON FOR A HEAVY-DUTY VEHICLE - An air spring piston for a heavy-duty vehicle includes a top portion and a bottom portion. The top portion includes a bumper and a connecting means for an air spring bellows. The bottom portion is mounted on a structure of the vehicle. The top portion and bottom portion are connected to each other to form a piston chamber and include a bearing means for reacting bumper forces from the bumper to the bottom portion and to the structure of the vehicle on which the bottom portion is mounted. The piston chamber is in fluid communication with a bellows chamber of the air spring via an opening, wherein the geometry of the opening is such that during dynamic spring movements, the pressure in the piston chamber and the pressure in the bellows chamber are not equalized. | 06-19-2014 |
20140265069 | VISCO-ELASTIC SUPPORT WITH ADDED DYNAMIC STIFFNESS - A visco-elastic damping assembly includes a mount housing having first and second ends and a hollow interior. A piston assembly disposed within the mount housing includes axially opposed first and second piston rod ends in which the first piston rod end is defined by a first diameter and the second piston rod end is defined by a second diameter substantially larger than the first diameter. A high pressure hydraulic reservoir is defined within the mount housing wherein an applied load component acting on the second piston rod end causes corresponding movement of the piston assembly against fluid retained in the hydraulic reservoir, enabling a first static spring rate as well as a second higher dynamic spring rate. | 09-18-2014 |
20140265070 | Overtravel Pressure Relief For A Gas Spring - A piston rod housing assembly for a gas spring includes a piston rod housing having an interior end, an exterior end axially spaced from the interior end, and an overtravel pressure relief passage extending axially through the piston rod housing and intersecting the exterior end. The assembly also includes an overtravel pressure relief member carried in the overtravel pressure relief passage and having an exterior end that projects axially beyond the piston rod housing. | 09-18-2014 |
20140374973 | GREASE SHUT-OFF GAS CYLINDER - A grease shut-off gas cylinder comprises an outer cylinder having a guide hole; a spindle inserted in the guide hole and having an inner pipe and an outer pipe; a piston rod having a piston wherein the bottom of a rod is fixed on a bottom surface of the outer cylinder and the top of the rod is slide-inserted in the inner pipe; a valve body secured to top of the spindle and controlling the spindle to move up or down about the piston on the basis of the operations of a valve pin which controls the moving direction of gas; a bushing member protruding from an outer side of the bottom of the spindle and coming into slide contact with an inner wall of the outer cylinder; and a bushing cap secured to top of the outer cylinder and having a guide hole configured to guide the spindle. | 12-25-2014 |
20150021839 | HYDRAULIC PRESSURE SPRING AND METHOD OF MANUFACTURING THE SAME - A hydraulic pressure spring includes a hollow cylindrical cylinder having a threaded portion at one end thereof; a closure means which is threadedly engaged with the threaded portion at the one end of the cylinder and closes the one end of the cylinder; a closure means which is provided at the other end of the cylinder and closes the other end of the cylinder; a compressible liquid which is sealed in an interior of the cylinder and is pressurized to a predetermined pressure; a rod which is passed through the closure means movably in an axial direction A and causes the liquid in the interior of the cylinder to undergo a pressure rise as the rod enters the interior of the cylinder; and a piston disposed in the interior of the cylinder and attached to one end of the rod. | 01-22-2015 |
20150076753 | Overtravel Pressure Relief For A Gas Spring - A gas spring for forming equipment. A casing includes an axially extending side wall, an open end, a transversely extending closed end wall axially spaced from the open end, a pressure chamber established in part by the side and end walls to receive a gas under pressure. A piston rod is received at least in part in the casing for reciprocation between extended and retracted positions. A piston rod housing is received at least in part in the casing between the piston rod and the casing. An overtravel pressure relief feature may be carried in a vent passage through the casing and/or in the piston rod housing. | 03-19-2015 |
20150377313 | HYDRAULIC TENSION SPRING - A hydraulic tension spring comprises a block comprising at least one liquid-impermeable cylinder and at least one piston disposed through an open end of the cylinder. The piston provides a piston guide within a liquid containment space within the cylinder filled with hydraulic fluid. A tensioning member moves the piston or the cylinder relative to the other to compress the hydraulic fluid and load the spring, while the piston guide keeps the piston axially aligned to prevent buckling. | 12-31-2015 |
267125000 | For use in well drilling or operating | 2 |
20080251980 | DEPTH COMPENSATED SUBSEA PASSIVE HEAVE COMPENSATOR - A depth compensated passive eave compensator comprises a first cylinder connected at its upper end to a vessel. A piston rod extends from a piston located within the first cylinder through the lower end thereof and is connected to subsea equipment. A second cylinder contains a compressed gas which maintains pressure beneath the piston of the first cylinder. The upper end of the first cylinder is connected to the upper end of a third cylinder having a piston mounted therein. A piston rod extending from the piston of third cylinder extends through the lower end thereof thereby applying the pressure of the sea to the piston of the third cylinder. | 10-16-2008 |
20080315471 | System And Method For Damping Vibration In A Drill String - A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers. | 12-25-2008 |
267126000 | System | 7 |
20120313305 | PNEUMATIC SPRING - A pneumatic spring consists of a hollow working cylinder ( | 12-13-2012 |
20130038004 | GAS SPRING WITH TEMPERATURE COMPENSATION - A gas spring is described, which comprises a first part which defines a cylinder, which comprises a longitudinal axis and which is closed at a first end along the longitudinal axis. The gas spring further comprises a piston, which is arranged to be movable along the longitudinal axis in the cylinder, a piston rod which is connected to the piston and which projects out through a second end of the cylinder, a separating piston which is arranged to be movable in the cylinder along the longitudinal axis between the piston and the first, gas which is contained in the cylinder between the separating piston and the first, and liquid which is contained between the separating piston and the piston. Moreover, the gas spring comprises an expansion chamber for the liquid and a pressure regulating device, which is adapted to control the liquid transport between the cylinder and the expansion chamber in dependence of the temperature, thereby keeping the force characteristics of the gas spring substantially independent of the temperature. | 02-14-2013 |
20130187316 | Gas Spring - A gas spring for forming equipment, including a piston received at least partially in a cylinder for reciprocation between extended and retracted positions, and including a throttling passage disposed between the piston and the cylinder in fluid communication between first and second pressure chambers during at least a portion of the reciprocation of the piston. The throttling passage is of variable cross-sectional area, which varies with a length of the passage to at least partially restrict gas flow therethrough in a manner varying with return of the piston toward its extended position to decelerate the piston at a predetermined rate. | 07-25-2013 |
20140138887 | GAS SPRING WITH DAMPENING - This invention concerns a gas spring having a working cylinder and therein a slidably arranged piston, whereas the working gas is, in order to provide for springing and dampening, optionally transferable between the working cylinder and the reservoir, characterized in that the reservoir is arranged in the piston rod. The gas or air spring according to this invention is self-dampening in both directions, i.e. at compression as well as at the extension. At compression it behaves as an air spring with dampening and at the extension it also behaves as an air spring with dampening, whereas both these damping effects can be, as regards the magnitude of the dampening, controlled independently from each other. | 05-22-2014 |
20160116015 | Z-HEAD PISTON FOR DUAL CHAMBER SHOCK STRUTS - A shock strut includes a first cylinder defining a first volume. The shock strut includes a first piston head moveably positioned within the first volume and defining a first fluid chamber and a third fluid chamber within the first volume. The shock strut includes a second cylinder defining a second volume. The shock strut includes a second piston head moveably positioned within the second volume and defining a second fluid chamber and a fourth fluid chamber within the second volume. The fourth fluid chamber is in fluid communication with the third fluid chamber. The shock strut also includes a bleed port. The shock strut also includes a tube extending from the fourth fluid chamber through the second piston head and the second fluid chamber to the bleed port. | 04-28-2016 |
267127000 | Trans-piston passage | 2 |
20100219569 | HYDRAULIC SHOCK ABSORBER - A hydraulic shock absorber includes a damper cylinder having a hollow bore therein. A piston rod and piston separate the bore into a rod side oil chamber and a piston side oil chamber. A pressure side damping force generator is provided with a sub piston in the piston side oil chamber. A first separator is provided in a sub piston side oil chamber of the sub piston, with a communication hole that communicates between the sub piston side oil chamber and a bladder side oil chamber. A hollow bladder is mounted in the bladder side oil chamber. A blow hole is provided in the bladder side oil chamber, the blow hole being normally closed by the bladder and opening when oil enters the bladder side oil chamber such that the bladder is contracted by an oil pressure when a volume of the oil reaches a predetermined capacity. | 09-02-2010 |
20130341842 | HYDROPNEUMATIC PISTON/CYLINDER ARRANGEMENT - The invention relates to a hydropneumatic piston/cylinder arrangement, in particular for use as a spring element and/or shock absorber element, comprising a cylinder (1) and a piston (15) which is axially movable in the cylinder chamber (5) of said cylinder, the cylinder chamber being tilled with hydraulic fluid. The piston (15) is connected to a piston rod (13) which extends outwards in a sealed manner from one end of the cylinder (1), and the base of said piston, which is remote from the piston rod (13), can he operatively connected to a pneumatic spring mechanism (7) in order to convey fluid. Said piston/cylinder arrangement is characterised in that a piston accumulator (7), the accumulator piston (19) of which directly adjoins the hydraulic fluid situated in the cylinder chamber (5), is provided as the spring mechanism. | 12-26-2013 |
267129000 | Seal | 3 |
20090152779 | High-Friction Fluid Seal and Shock Absorber - A high-friction fluid seal used for high-friction sealing, comprising a fluid seal lip provided on the working fluid filling side to intercept a working fluid; and a dust lip provided on the working fluid non-filling side (the outer side) of the fluid seal lip to intercept dust coming from the outside, wherein the thickness of a working fluid film formed on the extension stroke by the dust lip is smaller than the thickness of a working fluid film formed on the extension stroke by the fluid seal lip. | 06-18-2009 |
20130249151 | GAS SPRING OIL RESERVOIR - A gas spring includes a housing having an end configured to receive a rod therethrough, the rod extending to a piston movably positionable within the housing. A spacer separates a pair of sealing devices and forming a compartment containing oil that is positioned near the end of the housing, the compartment having a first portion and a second portion. The first portion is defined by the sealing devices, the spacer and the rod. The second portion is defined by the sealing devices, the spacer and the housing. The first portion is in fluid communication with the second portion permitting circulation of oil therebetween. | 09-26-2013 |
20160032999 | GAS-OPERATED SPRING - A gas-operated spring with overtravel safety device, comprising:
| 02-04-2016 |