EP3438469B1 - Pont avec un dispositif de bras de pivot - Google Patents

Pont avec un dispositif de bras de pivot Download PDF

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Publication number
EP3438469B1
EP3438469B1 EP17184853.4A EP17184853A EP3438469B1 EP 3438469 B1 EP3438469 B1 EP 3438469B1 EP 17184853 A EP17184853 A EP 17184853A EP 3438469 B1 EP3438469 B1 EP 3438469B1
Authority
EP
European Patent Office
Prior art keywords
pivot arm
hydraulic
effective area
gas
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17184853.4A
Other languages
German (de)
English (en)
Other versions
EP3438469A1 (fr
Inventor
Pieter Bijmans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Van Halteren Technologies Boxtel BV
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP17184853.4A priority Critical patent/EP3438469B1/fr
Publication of EP3438469A1 publication Critical patent/EP3438469A1/fr
Application granted granted Critical
Publication of EP3438469B1 publication Critical patent/EP3438469B1/fr
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1466—Hollow piston sliding over a stationary rod inside the cylinder
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D15/00—Movable or portable bridges; Floating bridges
    • E01D15/005—Movable bridges in general ; Constructional elements peculiar to movable bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D15/00—Movable or portable bridges; Floating bridges
    • E01D15/06—Bascule bridges; Roller bascule bridges, e.g. of Scherzer type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers

Definitions

  • the invention relates to a movable bridge comprising a pivot arm device in accordance with the preamble of claim 1.
  • movable bridges for example in the form of bascule bridges, are known. Such bridge is used, for example, for bridging crossing shipping routes.
  • a supporting structure of the bridge is movable in this case about an axis of rotation, for example. Hydraulic cylinders may be provided for moving the supporting structure.
  • Such movable bridge is disclosed, for example, in US 3,376,795 or in US 5,454,127 .
  • bascule bridges are known in which a compensating mass or a compensating weight is provided for the supporting structure.
  • the compensating weight then reduces the load acting on the hydraulic cylinders. In this way, less, especially electrical, energy is required to drive the hydraulic cylinders and thus to move the supporting structure. It is a drawback of the compensating weight that complicated mechanical constructions and construction work, especially for a base, are required, which entails high costs.
  • the object underlying the invention is to provide a bridge which eliminate the afore-mentioned drawbacks.
  • a pivot arm device comprising a pivot arm.
  • the latter may be rotatably, especially pivotally, supported especially at a distance from the center of gravity of the pivot arm.
  • the pivot arm may further be connected to a hydraulic cylinder which acts on the pivot arm especially at a distance from the pivot bearing.
  • the pivot arm then can be pivoted or rotated via the hydraulic cylinder in a raising direction and in a lowering direction.
  • the hydraulic cylinder preferably rests, especially rotatably, on a fixed bearing.
  • the hydraulic cylinder preferably has a first effective area which acts in a raising direction of the pivot arm and to which pressure medium or oil can be applied.
  • a second effective area may be provided which can act in the lowering direction of the pivot arm and to which pressure fluid can be applied.
  • a third effective area acting especially in the raising direction to which pressure medium can be applied may be provided for load compensation or gravitational force compensation of the pivot arm.
  • the hydraulic cylinder or actuating cylinder includes a third surface or effective area adapted to be used for load compensation, wherein a compensating weight as explained in the beginning can be dispensed with and, in this way, raising forces to be applied by the hydraulic cylinder via the first effective area are reduced.
  • a compensating weight as explained in the beginning can be dispensed with and, in this way, raising forces to be applied by the hydraulic cylinder via the first effective area are reduced.
  • the hydraulic cylinder requires comparatively small amounts of pressure medium to operate the former. These amounts are comparable when using a hydraulic cylinder having two chambers.
  • the third effective area delimits a third cylinder chamber within the hydraulic cylinder.
  • the third cylinder chamber then is connected to a gas-loaded hydraulic accumulator.
  • a hydraulic accumulator having a predetermined closed gas volume is provided and can be biased in this way.
  • the hydraulic accumulator may be used as a gas spring so as to replace a compensating weight, for example.
  • the hydraulic cylinder along with the third cylinder chamber then can be passively used in a technically simple manner without any control valves, for example, being provided.
  • the flow path between the hydraulic accumulator and the third cylinder chamber is in the form of a closed system and is not in fluid communication with the other effective areas.
  • the third cylinder chamber is separated from the first and second effective areas.
  • the hydraulic accumulator has a separating element for separating a gas volume from pressure medium for the third effective area.
  • the gas volume is designed so that the compensating force applied via the third effective area through the hydraulic accumulator is adapted to the holding force of the pivot arm during lowering/raising the pivot arm.
  • Only low forces have to be applied via the first effective area for raising the pivot arm.
  • This is also applicable to lowering the pivot arm, wherein a force for lowering the pivot arm can be applied via the second effective area, where needed.
  • the holding force for retaining the pivot arm which has to be applied by the hydraulic cylinder is dependent on the position of the pivot arm. The more the pivot arm is pivoted upwards, the less the holding force and vice versa.
  • the compensating force applied via the hydraulic accumulator is not constant but depending on the holding force.
  • the gas volume of the hydraulic accumulator is preferably designed so that the compensating force applied via the third effective area through the hydraulic accumulator increases when lowering the pivot arm and drops when raising the pivot arm.
  • the gas volume is chosen to be comparatively small so that, when retracting the hydraulic cylinder and when lowering the pivot arm, a curve of the compensating force is provided as a strongly rising characteristic line which at least approximately matches the increasing holding force of the pivot arm.
  • the optimization of the effective areas of the hydraulic cylinder, of the gas volume and of the filling pressure of the hydraulic accumulator results in a very steep pressure curve.
  • a steep stroke-dependent pressure may be made available to the connected hydraulic accumulator.
  • the gas volume is comparatively small, which may result in a steep pressure curve.
  • the size of the hydraulic accumulator thus may be selected by way of the desired pressure characteristic on the actuating cylinder or hydraulic cylinder.
  • a piston-type accumulator is preferably provided as hydraulic accumulator.
  • Said piston-type accumulator is extremely pressure-tight and thus most advantageously suited for the pivot arm device so as to serve as a substitute for a compensating weight. It is also imaginable to provide a bladder accumulator as a hydraulic accumulator. It is further imaginable to use plural hydraulic accumulators in parallel in a fluidic manner.
  • a valve is fluidically provided between the hydraulic accumulator and the third cylinder chamber.
  • Said valve may be used to block the pressure medium communication, for example.
  • pressure medium can be relieved by the valve in a restricted manner from the third cylinder chamber to the hydraulic accumulator, when the pivot arm is lowered, so as to adapt the compensating force to the holding force of the pivot arm.
  • a set of hydraulic accumulators having differently sized gas volumes may be provided.
  • One of said hydraulic accumulators may be selected for being connected to the third cylinder chamber by way of a desired pressure characteristic of the hydraulic cylinder.
  • the hydraulic cylinder and the at least one hydraulic accumulator form a unit and are, for example, mechanically connected to each other.
  • the first effective area of the hydraulic cylinder delimits a first cylinder chamber which is connected to a hydraulic machine. Via the latter pressure medium may be adapted to be conveyed into the first cylinder chamber so as to raise the pivot arm, for example.
  • the second effective area delimits a second cylinder chamber of the hydraulic cylinder which is connected to the hydraulic machine. If a connection to the hydraulic machine is provided, the latter may be in fluidic arrangement between the first and second cylinder chambers.
  • the hydraulic machine may be used as a hydraulic pump, for example. If the latter is arranged between the first and second cylinder chambers, it may convey pressure medium, for example, from the first into the second cylinder chamber to lower the pivot arm. For raising the pivot arm, the hydraulic pump can convey pressure medium from the second into the first cylinder chamber.
  • the hydraulic machine can additionally be used as hydraulic motor so that the latter then may be provided for energy recovery, for example. If, for instance, the pivot arm is lowered on the basis of its weight force, pressure medium may flow from the first cylinder chamber via the hydraulic motor to the second cylinder chamber in order to use the hydraulic motor for driving a generator.
  • the effective areas are configured in a technically simple manner on a piston of the hydraulic cylinder which in turn may be connected to the pivot arm.
  • the first and second effective areas are approximately equal. This offers the advantage that no device for compensating a difference in the pressure medium volume has to be provided, which allows to configure the pivot arm device in an extremely compact and simple manner.
  • the piston of the hydraulic cylinder is guided in a cylinder housing.
  • a piston rod which may protrude from the cylinder housing and may be connected to the pivot arm may extend away from the piston.
  • An axial blind hole recess is introduced to the piston and to the piston rod, for example, from a piston side of the piston facing away from the piston rod.
  • a guiding rod tightly connected to the cylinder housing may then extend in the axial direction, wherein the piston and the piston rod are guided on the same via the blind hole recess.
  • the first effective area is a bottom area of the blind hole recess, for example.
  • a fluid path may axially pass through the guiding rod, wherein the first cylinder chamber delimited by the first effective area can be communicated with the hydraulic machine via said fluid path.
  • a piston area provided on the side of the piston rod then may form the second effective area.
  • the piston area facing away from the piston rod may be provided as a third effective area.
  • the pivot arm is in the form of a supporting structure of a movable bridge.
  • the bridge is a bascule bridge with hydraulic actuation.
  • the use of the hydraulic cylinder having three chambers allows to dispense with a compensating weight in the bridge or allows to at least reduce a compensating weight. Accordingly, construction expenditure and a demand of space are extremely low. Bridges including a compensating weight have to be designed to be extremely stable because of the large additional movable mass, which results in high expenditure on material and constructional design.
  • the small available space required and the simpler configuration of the movable bridge renders the same cheaper and, on the other hand, effects on a landscape where the bridge is provided are definitely reduced due to the smaller overall size and the simplified configuration.
  • a hydraulic drive may be designed to be appropriately small, which is more cost-efficient and saves available space.
  • movable bridges known from prior art including a compensating weight usually exhibit extremely expensive and large-scale steel constructions which are cost-intensive and affect the overall appearance of the landscape.
  • the pivot arm is employed, especially on a vessel, for raising and lowering a suction pipe system. In this way, an energy input can equally be considerably reduced as compared conventional systems.
  • the pivot arm is a loading bridge of a transport vehicle.
  • a pressure medium accumulator can be designed to be very small due to the small amounts of pressure medium required. This is extremely advantageous in a transport vehicle, for example in the form of a truck.
  • pivot arm in a fairground ride. This entails an extremely low energy input, which is of great advantage to the operator of such ride.
  • the pivot arm may be provided in a backhoe dredger used on a vessel, for example. It is of advantage in this case that low energy is required and, besides, minimum space is required for the hydraulic system due to the small amount of pressure medium.
  • the pivot arm may also be used in a crane, especially in a knuckle boom crane, in order to save energy costs.
  • pivot arm is also imaginable to design the pivot arm as an, especially motion-compensated, gangway, in particular for a vessel, so as to save energy costs.
  • pivot arm in a mobile work machine to save fuel due to the reduced energy demand.
  • a movable bridge 1 is shown. It has a pivot arm in the form of a supporting structure 2.
  • the supporting structure 2 is rotatably supported about a horizontal axis via a pivot bearing 4.
  • a hydraulic cylinder 6 comprising a hydraulic accumulator 8 is provided.
  • the hydraulic cylinder 6 acts on a lower side 12 of the supporting structure 2 with its piston rod 10.
  • the hydraulic cylinder 6 is supported by a pivot bearing 14.
  • the pivot bearings 4, 14 are stationary in this case.
  • a pivot arm device 16 of Figure 1 is illustrated. It includes the hydraulic cylinder 6 which is in the form of a differential cylinder and includes a cylinder housing 18. In the latter, a piston 20 is guided to be axially displaceable. A piston rod 10 connected to the supporting structure 2 of Figure 1 extends from the piston 20.
  • the piston 20 has a first effective area 24 to which pressure medium can be applied in the extending direction of the piston rod 10. Via a second effective area 26 pressure medium can be applied to the piston 20 in the retracting direction of the piston rod 10. Moreover, a third effective area 28 is provided to which pressure medium can be equally applied in the extending direction of the piston rod 10.
  • a hollow guiding rod 34 (inner tube) immersing in an axial blind hole recess 32 of the piston 20 and of the adjacent piston rod 10 extends on the bottom side of the cylinder housing 18. A bottom area of the blind hole recess 32 facing the hollow guiding rod 34 then forms the first effective area 24. The latter is supplied with pressure medium via the hollow guiding rod 34.
  • the first effective area 24 thus delimits a first cylinder chamber that is communicated with a closed- or open-loop, especially pivotal, hydraulic machine 36 via a pressure port A.
  • the piston 20 in the cylinder housing 18 delimits a second cylinder chamber which is equally communicated with the hydraulic machine 36 via a pressure port B.
  • the hydraulic machine is thus arranged between the pressure ports A and B.
  • the piston 20 delimits a third cylinder chamber which is not in fluid communication with the hydraulic machine 36 or with the pressure ports A, B, but is communicated with the hydraulic accumulator 8 via a pressure port C.
  • the cylinder chamber delimited by the third effective area 28 thus is a passive cylinder chamber which is not actively supplied with pressure medium by a hydraulic machine.
  • the hydraulic accumulator 8 includes a piston 38 as a separating element.
  • the piston 38 separates a pressure medium chamber 40 including especially oil and being connected to the pressure port C from a pressure chamber 42 filled with gas, especially nitrogen. When air is used instead of nitrogen, the hydraulic medium used, should be adjusted to this gas to eliminate the risk of dieseling.
  • the hydraulic accumulator 8 may be connected to the pressure port C via a valve 44. Hence, via the hydraulic accumulator 8 pressure medium can be applied to the piston 20 of the hydraulic cylinder 6 via its third effective area 28 in the extending direction of the piston rod 10, resulting in a passive compensating force which compensates the weight of the supporting structure 2 of Figure 1 .
  • the hydraulic cylinder 6 has a comparatively small pressure chamber 42.
  • FIG 3 illustrates an A frame having two pivot arm devices 46, 48.
  • Each of the latter includes a pivot arm 50, 52 extending at a distance parallel to each other and being connected via a beam 54.
  • the A frame is U-shaped.
  • Each of the pivot arm devices 46 and 48 is configured corresponding to the embodiment in Figure 2 . It is imaginable that they share hydraulic accumulators or that each of them has a hydraulic accumulator.
  • a vessel 56 is shown including a suction pipe system 58.
  • the latter has three pivot arm devices that are used for raising and lowering a suction pipe.
  • a vehicle in the form of a truck 60 which has a trailer including a loading bridge 62.
  • the latter constitutes a pivot arm capable of being pivoted by two pivot arm devices 64, 66.
  • Each of them is configured corresponding to the pivot arm device of Figure 2 , wherein it is imaginable that they share a hydraulic accumulator.
  • Figure 6 illustrates a fairground ride. It includes a plurality of gondolas which are height-adjustable via bent pivot arms. Each of the pivot arms is pivoted via a pivot arm device.
  • FIG 7 illustrates a vessel 70 comprising a backhoe dredger 72 which includes a pivot arm 74 capable of being pivoted via two pivot arm devices 76, 78. The latter are configured in accordance with Figure 2 .
  • Figure 8 illustrates a motion-compensated gangway 80. It forms a pivot arm which is capable of being pivoted in height by a pivot arm device.
  • a mobile work machine 82 which equally includes a pivot arm 84 pivotal in height which is capable of being pivoted via a pivot arm device.
  • Figure 10 shows a crane in the form of a knuckle boom crane 86.
  • the main pivot arm 88 thereof can be pivoted by two pivot arm devices, each being configured according to Figure 2 . It is imaginable that the connected pivot arm can also be pivoted by a pivot arm device.
  • a crane 90 comprising a pivot arm 92 which can be pivoted by a pivot arm device.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Manipulator (AREA)

Claims (5)

  1. Pont mobile comprenant un dispositif de bras pivotant, le dispositif de bras pivotant comprenant un bras pivotant (2) sous la forme d'une structure de support (2) du pont (1) qui est supportée de manière rotative par le biais d'un palier de pivotement (4), et un vérin hydraulique (6) agissant sur le bras pivotant (2) pour entraîner une rotation de celui-ci, caractérisé en ce que le dispositif de bras pivotant comprend en outre un accumulateur hydropneumatique (8) et une machine hydraulique (36), le vérin hydraulique (6) comportant une première section efficace (24) qui agit dans la direction d'élévation du bras pivotant (2) et à laquelle une substance de pression peut être appliquée, une deuxième section efficace (26) qui agit dans la direction d'abaissement du bras pivotant (2) et à laquelle une substance de pression peut être appliquée, et une troisième section efficace (28) à laquelle une substance de pression peut être appliquée, la première section efficace (24), la deuxième section efficace (26) et la troisième section efficace (28) étant prévues à des fins de compensation de charge du bras pivotant (2), la troisième section efficace (28) délimitant une troisième chambre de vérin à l'intérieur du vérin hydraulique (6), la troisième chambre de vérin étant raccordée à l'accumulateur hydropneumatique (8) comprenant un élément de séparation (38) séparant un volume de gaz (42) de la substance de pression pour la troisième section efficace (28), le volume de gaz (42) étant conçu de telle sorte que la force de compensation appliquée par la troisième section efficace (28) par le biais de l'accumulateur hydropneumatique (8) soit adaptée à la force de retenue pour le bras pivotant (2) pendant l'abaissement et/ou l'élévation du bras pivotant (2), la première section efficace (24) délimitant une première chambre de vérin raccordée à la machine hydraulique (36) par laquelle la substance de pression peut être acheminée à la première chambre de vérin (32) et la deuxième section efficace (26) délimitant une deuxième chambre de vérin raccordée à la machine hydraulique (36), les première et deuxième sections efficaces (24, 26) étant approximativement égales et l'utilisation du vérin hydraulique (6) permettant de réduire un poids de compensation dans le pont (1).
  2. Pont mobile selon la revendication 1, dans lequel l'accumulateur hydropneumatique (8) se présente sous la forme d'un accumulateur à piston ou d'un accumulateur à vessie.
  3. Pont mobile selon l'une quelconque des revendications précédentes, dans lequel un ensemble d'accumulateurs hydropneumatiques (8) présentant différents niveaux de remplissage de gaz et/ou volumes de gaz est prévu et un accumulateur hydropneumatique (8) est sélectionné pour être raccordé à la troisième chambre de vérin pour la troisième section efficace (28) en fonction d'une caractéristique de pression souhaitée du vérin hydraulique (6).
  4. Pont mobile selon l'une quelconque des revendications précédentes, dans lequel le vérin hydraulique (6) et l'accumulateur hydropneumatique (8) sont raccordés mécaniquement et constituent une unité.
  5. Pont mobile selon l'une quelconque des revendications précédentes, dans lequel les sections efficaces (24, 26, 28) sont formées sur un piston (20) du vérin hydraulique (6) raccordé au bras pivotant (2).
EP17184853.4A 2017-08-04 2017-08-04 Pont avec un dispositif de bras de pivot Active EP3438469B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17184853.4A EP3438469B1 (fr) 2017-08-04 2017-08-04 Pont avec un dispositif de bras de pivot

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17184853.4A EP3438469B1 (fr) 2017-08-04 2017-08-04 Pont avec un dispositif de bras de pivot

Publications (2)

Publication Number Publication Date
EP3438469A1 EP3438469A1 (fr) 2019-02-06
EP3438469B1 true EP3438469B1 (fr) 2022-06-22

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186305A (en) * 1963-07-02 1965-06-01 Ex Cell O Corp Hydraulic actuator mechanism
US3376795A (en) 1965-10-21 1968-04-09 Valentine E Macy Jr Hydraulic drive cylinder
JPS5438306U (fr) * 1977-08-23 1979-03-13
FR2631641B1 (fr) * 1988-05-19 1992-01-24 Baudin Chateauneuf Pont mobile, notamment pour le franchissement de voies d'eau
US5454127A (en) 1994-03-30 1995-10-03 Teng & Associates, Inc. Unbalanced bascule bridge with concrete slab roadway
FI990609A (fi) * 1999-03-18 2000-09-19 Ossi Kortesalmi Järjestely nostopuomin tai vastaavan nostamiseksi ja laskemiseksi kaivinkoneessa tai vastaavassa nostolaitteessa
US20070068754A1 (en) * 2005-09-26 2007-03-29 Furgala George W Gas-biased hydraulic cylinder
DE102007061294A1 (de) * 2007-12-10 2009-06-18 Thomas Sauer Hydraulikzylinder mit drei Hubkammern und Energiespeicher

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