EP1679284B1 - Teleskopische Hebesäule - Google Patents

Teleskopische Hebesäule Download PDF

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Publication number
EP1679284B1
EP1679284B1 EP05075090A EP05075090A EP1679284B1 EP 1679284 B1 EP1679284 B1 EP 1679284B1 EP 05075090 A EP05075090 A EP 05075090A EP 05075090 A EP05075090 A EP 05075090A EP 1679284 B1 EP1679284 B1 EP 1679284B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
lifting column
piston unit
piston
operating chamber
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.)
Not-in-force
Application number
EP05075090A
Other languages
English (en)
French (fr)
Other versions
EP1679284A1 (de
Inventor
Tone Oudelaar
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.)
Enerpac Tool Group Corp
Original Assignee
Actuant Corp
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 Actuant Corp filed Critical Actuant Corp
Priority to EP05075090A priority Critical patent/EP1679284B1/de
Priority to DK05075090T priority patent/DK1679284T3/da
Priority to DE602005007849T priority patent/DE602005007849D1/de
Priority to AT05075090T priority patent/ATE399738T1/de
Publication of EP1679284A1 publication Critical patent/EP1679284A1/de
Application granted granted Critical
Publication of EP1679284B1 publication Critical patent/EP1679284B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B66F3/26—Adaptations or arrangements of pistons
    • B66F3/28—Adaptations or arrangements of pistons telescopic
    • 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
    • F15B15/1404—Characterised by the construction of the motor unit of the straight-cylinder type in clusters, e.g. multiple cylinders in one block

Definitions

  • the invention relates to a telescopic lifting column, comprising a plurality of tube bodies which are arranged concentrically inside one another and are axially movable in each case with respect to each other, and a hydraulic actuator unit which is arranged in the tube bodies so as to be operating in the axial direction.
  • This actuator unit comprises a first hydraulic cylinder-piston unit and a second hydraulic cylinder-piston unit connected with the first, the first cylinder-piston unit being connected to a first end of the telescopic lifting column and the second cylinder-piston unit being connected to a second end of the telescopic lifting column, with the first cylinder-piston unit having a variable operating chamber and the second cylinder-piston unit having a variable operating chamber, said operating chambers being in communication with one another.
  • US 2002/0144349 A1 shows a lifting column for an operating table.
  • the lifting column has four tube bodies which are arranged concentrically inside one another and a hydraulic actuator unit.
  • the actuator unit has two cylinder-piston units of the type where each has a first and a second variable operating chamber.
  • the first cylinder-piston unit is connected to a base by means of a piston rod.
  • the second cylinder-piston unit is connected to the table top by means of a piston rod.
  • the first operating chamber of the first cylinder-piston unit is connectable to a pump or to a reservoir via a control valve.
  • the first operating chambers of the first and second cylinder-piston units are connected to one another via a hydraulic line, so that the first operating chambers are simultaneously in communication with the pump or the reservoir.
  • the second operating chamber of the second cylinder-piston unit is connectable to the pump and the reservoir via a valve.
  • the second operating chambers of the first and second cylinder-piston units are likewise connected to one another via a hydraulic line, so that the second operating chambers are likewise simultaneously in communication with the pump or the reservoir.
  • a consequence of the design of the cylinder-piston units of the known lifting column is that both the first and the second operating chambers have to be connectable to the pump and the reservoir and therefore at least one connection port and one supply/discharge line for hydraulic fluid have to be provided for each cylinder-piston unit. Furthermore, at least two control valves are required in order to be able to connect the operating chambers to the pump or to the reservoir.
  • a lifting column with three tube bodies in which a hydraulic actuator unit is arranged.
  • the hydraulic actuator unit has two cylinder-piston units of the double acting type, thus each of them having a first and a second operating chamber.
  • the first operating chamber of the first cylinder-piston unit is connected to the first operating chamber of the second cylinder-piston unit.
  • the second operating chamber of the first cylinder-piston unit is connected to the second operating chamber of the second cylinder-piston unit.
  • the two operating chambers of the first cylinder-piston/unit are each, via an external connection, connected to a separate supply/discharge hose for supplying/discharging hydraulic fluid from the operating chambers.
  • a lifting column according to the preamble of claim 1, characterized in that the first cylinder-piston unit is of the type having a first variable operating chamber and a second variable operating chamber, and the second cylinder-piston unit is of the type having a single variable operating chamber which is in communication with the second operating chamber of the first cylinder-piston unit.
  • the operating chamber of the second cylinder-piston unit and the second operating chamber of the first cylinder-piston unit together therefore form a substantially closed space.
  • a decrease in volume of the second operating chamber of the first cylinder-piston unit takes place and, as a result of the connection, an increase in volume of the operating chamber of the second cylinder-piston unit takes place.
  • Only one external connection is required to push the pistons of the respective cylinder-piston units out or to pull them in in order to supply hydraulic fluid from a pump or to discharge it to a reservoir.
  • the lifting column according to the invention requires less hydraulic fluid to achieve the same outward stroke because, in the known design, fluid from the operating chamber of which the volume is decreased during pushing out, is discharged to a reservoir without being utilized.
  • the lifting column comprises three tube bodies, wherein the hydraulic actuator unit is connected to the middle tube body.
  • the outermost tube sections are extended or retracted synchronously over an equal distance with respect to the middle tube section when the actuator unit is being operated. This results in a more stable lifting column capable of assuming any position between the completely extended state and the completely retracted state.
  • Figs 1 and 2 show a telescopic lifting column 1 according to the invention in the completely retracted and the completely extended states.
  • the preferred embodiment shown is designed to be used in an upright position.
  • the lifting column 1 has a bottom tube section 2, a middle tube section 3 and a top tube section 4.
  • the middle tube section 3 has a smaller outer diameter than the internal diameter of the bottom tube section 2.
  • the top tube section 4 has a smaller outer diameter than the inner diameter of the middle tube section 3.
  • the tube sections 2, 3, 4 are arranged concentrically inside one another.
  • the sliding bearings 5 and 6 are provided on their underside with a radially inward flange 5a and 6a, respectively.
  • a groove 10 is provided in the sliding bearing 5, which groove 10 extends in the axial direction.
  • a projection 11 is arranged on the outer surface of the middle tube section 3, near the bottom thereof, which projection 11 is accommodated in the groove 10.
  • a groove 12 is provided in the sliding bearing 6 , which groove 12 extends in the axial direction, and a projection 13 is arranged near the bottom of the top tube section 4, which projection 13 is accommodated in the groove 12.
  • a sealing cap 7 is arranged at the top end of the bottom tube section 2 and with the outside bears against the inner surface of the bottom tube section 2 and with the inside bears against the outer surface of the middle tube section 3.
  • the sealing cap 7 has a flange 7a which bears against the end side of the bottom tube section 2.
  • the sealing cap 7 serves as a spacer between the bottom tube section 2 and the middle tube section 3.
  • a sealing cap 8 having a flange 8a is arranged in an identical manner between the middle tube section 3 and the top tube section 4 and serves as a spacer between the middle tube section 3 and the top tube section 4.
  • the bottom tube section 2 is provided with a base plate 14 which serves as a sealing cover for the underside of the bottom tube section 2.
  • the top tube section 4 is provided with a cover plate 15 at the top.
  • the lifting column 1 comprises a hydraulic actuator unit 20 which is arranged in the interior space delimited by the tube sections 2, 3, 4.
  • the actuator unit 20 comprises a first cylinder-piston unit 30 having a cylinder 31 with a cylinder head 38 and extending in the axial direction of the tube sections 2-4, and a piston 32 arranged in the cylinder 31 and having a piston rod 33.
  • a cylinder 41 of a second cylinder-piston unit 40 is arranged substantially parallel with and next to the cylinder 31 of the first cylinder-piston unit 30.
  • the second cylinder-piston unit 40 has a piston 42 with a piston rod 43.
  • the cylinders 31 and 41 are arranged in an upright position and next to one another on a base plate 21 and are fixedly attached to the latter, said base plate 21 in turn being fixedly mounted on the underside of the middle tube section 3.
  • the piston rod 33 of the first cylinder-piston unit 30 extends through an aperture in the base plate 21 downwards and is connected by a bottom end 33a to a nipple 14a which is fitted on the base plate 14 of the bottom tube section 2, for example by means of a threaded connection.
  • the piston rod 34 preferably extends at right angles to the bottom.
  • the piston rod 43 of the second cylinder-piston unit 40 is connected to the cover plate 15 of the top tube section 4.
  • the piston rod 33 and the piston 32 are provided with a supply/discharge duct 34, 35 for hydraulic fluid.
  • a connection port 22 is arranged in the base plate 14, to which port a hydraulic line can be connected which joins the lifting column to a hydraulic assembly (not shown) comprising a pump, a reservoir and at least one control valve.
  • a duct 23 is formed in the base plate 14, between the connection port 22 and the nipple 14a, connecting the connection port to the supply/discharge duct 34 in the piston rod 33.
  • Hydraulic fluid can be supplied to and/or discharged from a first operating chamber 36 in the cylinder 31 via the supply/discharge duct 34, 35 in the piston 32 and piston rod 33, which first operating chamber 36 is delimited by the cylinder wall, the cylinder head 38 and the piston 32.
  • the first cylinder-piston unit 30 has a second operating chamber 37 which is delimited by the cylinder wall, the piston 32, the piston rod 34 and the base plate 21 which is connected to the middle tube section.
  • the second operating chamber 37 is at a maximum volume and the first operating chamber 36 at a minimum volume.
  • the first operating chamber is at a maximum volume and the second operating chamber 37 at a minimum volume.
  • the second cylinder-piston unit 40 is of the type which has only one operating chamber 47.
  • the operating chamber 47 of the second cylinder-piston unit 40 is connected to the second operating chamber 37 of the first cylinder-piston unit 30 via a duct 24 which is arranged in the base plate 21.
  • the operating chamber 47 of the second cylinder-piston unit 40 and the second operating chamber 37 of the first cylinder-piston unit 30 in principle form a closed entity and together have a constant volume.
  • the first cylinder-piston unit 30 and the second cylinder-piston unit 40 have an identical stroke length and the maximum volume of the operating chamber 47 (see Fig. 2 ) is equal to the maximum volume of the second operating chamber 37 (see Fig. 1 ).
  • the second cylinder 41 having an inner diameter which corresponds to the difference between the inner diameter of the first cylinder 31 and the outer diameter of the piston rod 34. This means that it is possible to push the cylinder-piston units 30, 40 out at a constant and uniform speed, independently of the load.
  • the total length of the lifting column in the completely retracted state could be approximately 35 cm, for example, and in the completely extended state ( Fig. 2 ) approximately 75 cm.
  • the first and second cylinder-piston units 30, 40 each have a length of stroke of 20 cm.
  • a bypass 39 is provided at the bottom end of the cylinder 31 of the first cylinder-piston unit 30, by which hydraulic fluid can flow along the piston 32 of the first operating chamber 36 to the second operating chamber 37 when the piston is near the end of the stroke, as is indicated in Fig. 2 .
  • the bypass 39 by way of example, is in the shape of a small recess on the inside of the cylinder wall, but may, for example, also be designed as a duct.
  • the purpose of the bypass 39 is to prevent the second operating chamber not being filled to its maximum volume as a result of hydraulic oil leaking out of the second operating chamber 37 and the operating chamber 47 if the gasket is not completely sealed. Any shortfall in oil is supplemented via the bypass 39 and the telescopic lifting column 1 can thus still reach its maximum extended state despite the losses due to leakage.
  • a discharge duct 27 is arranged in the base plate 21 and serves for discharging hydraulic fluid which has leaked from the hydraulic actuator unit 20 onto the base plate 21 down towards the bottom tube section.
  • a discharge duct 25 is arranged in the base plate 14 and is connected to a discharge port 26 in order to discharge hydraulic fluid which has leaked onto the base plate 14 to a reservoir.
  • hydraulic fluid is supplied under pressure via connection port 22 and supply/discharge ducts 23, 34 and 35 to the first operating chamber 36.
  • the first operating chamber 36 increases in volume and the cylinder 31 is pushed upwards with respect to the piston 32 while carrying the base plate 21 along.
  • the volume of the second operating chamber 37 decreases and hydraulic fluid is pumped from the second operating chamber 37 to the operating chamber 47 of the second cylinder-piston unit via the duct 24, as a result of which the operating chamber 47 increases in volume and the piston 42 inside the cylinder 41 is pushed upwards, by which the top tube section 4 which is connected to the piston rod 43 is moved upwards with respect to the cylinder 41.
  • the projection 11 is positioned against a bottom edge of the groove 10 in the sliding bearing 5.
  • the projection 13 is likewise positioned against a bottom edge of the groove 12 in the sliding bearing 6.
  • the first operating chamber 36 can be connected to a reservoir via the connection port 22 and the ducts 35, 34 and 23. This leads to a loss of pressure in the first operating chamber 36, causing the lifting column 1 to be pushed into one another by the effect of the load which is acting on them.
  • hydraulic fluid flows from the operating chamber 47 of the second cylinder-piston unit 40 to the second operating chamber of the first cylinder-piston unit 30 via the duct 24. Furthermore, hydraulic fluid flows from the first operating chamber 36 to the reservoir.
  • the projections 13 and 11, respectively, are guided downwards in the associated grooves 12 and 10, respectively, until they reach the bottom edge of the grooves 12 and 10, respectively, after which the sliding bearings 6 and 5, respectively, are pulled along downwards by the tube sections 4 and 3, respectively.
  • the sliding bearings 5, 6 which slide along concomitantly have a positive effect on the rigidity of the lifting column 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Vibration Dampers (AREA)
  • Vehicle Body Suspensions (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (13)

  1. Teleskopische Hebesäule (1), mit:
    - einer Vielzahl von Rohrkörpern (2, 3, 4), die konzentrisch ineinander angeordnet und jeweils axial zueinander bewegbar sind,
    - einer hydraulischen Betätigungseinheit (20), die in den Rohrkörpern (2, 3, 4) angeordnet ist, um in axialer Richtung zu arbeiten, und eine erste hydraulische Zylinder-Kolben-Einheit (30) sowie eine zweite hydraulische Zylinder-Kolben-Einheit (40), die mit der ersten verbunden ist, umfaßt, wobei die erste Zylinder-Kolben-Einheit (30) mit einem ersten Ende der teleskopischen Hebesäule und die zweite Zylinder-Kolben-Einheit mit einem zweiten Ende der teleskopischen Hebesäule (1) verbunden ist, wobei die erste Zylinder-Kolben-Einheit (30) eine veränderliche Arbeitskammer (37) und die zweite Zylinder-Kolben-Einheit (40) eine veränderliche Arbeitskammer (47) aufweist und die Arbeitskammern (37, 47) miteinander verbunden sind,
    und wobei die erste Zylinder-Kolben-Einheit (30) von der Art ist, die eine erste veränderliche Arbeitskammer (36) und eine zweite veränderliche Arbeitskammer (37) aufweist, dadurch gekennzeichnet, daß die zweite Zylinder-Kolben-Einheit (40) von der Art ist, die eine einzige veränderliche Arbeitskammer (47) aufweist, die in Verbindung mit der zweiten Arbeitskammer (37) der ersten Zylinder-Kolben-Einheit (30) steht.
  2. Teleskopische Hebesäule nach Anspruch 1, bei der ein Bypass (39) in der ersten Zylinder-Kolben-Einheit (30) im Bereich des Endes des Kolbenhubes angeordnet ist, wo das Volumen der zweiten Arbeitskammer (37) minimal ist, wobei der Bypass (39) die erste und die zweite Arbeitskammer (36, 37) der ersten Zylinder-Kolben-Einheit (30) miteinander verbindet.
  3. Teleskopische Hebesäule nach Anspruch 1 oder 2, bei der die Kolbenstange (33) und der Kolben (32) der ersten Zylinder-Kolben-Einheit (30) mit einer Zuführleitung (34, 35) zum Zuführen von Hydraulikfluid an die erste Arbeitskammer (36) versehen sind.
  4. Teleskopische Hebesäule nach Anspruch 3, wobei das erste Ende der teleskopischen Säule (1) mit einer ersten Abdeckplatte (14) versehen ist, an der die Kolbenstange (33) der ersten Zylinder-Kolben-Einheit (30) im wesentlichen rechtwinklig zu dieser montiert ist.
  5. Teleskopische Hebesäule nach Anspruch 4, bei der die erste Abdeckplatte (14) mit einem Verbindungsanschluß (22) und mit einer daran angeschlossenen Fluidleitung (23) versehen ist, wobei letztere mit der Zuführleitung (34) in der Kolbenstange (13) verbunden ist.
  6. Teleskopische Hebesäule nach Anspruch 4 oder 5, wobei das zweite Ende der teleskopischen Säule mit einer zweiten Abdeckplatte (15) versehen ist, an der die Kolbenstange (43) der zweiten Zylinder-Kolben-Einheit (40) im wesentlichen rechtwinklig dazu montiert ist.
  7. Teleskopische Säule nach einem der vorhergehenden Ansprüche, bei der die erste Zylinder-Kolben-Einheit (30) und die zweite Zylinder-Kolben-Einheit (40) eine identische Hublänge aufweisen und das maximale Volumen der Arbeitskammer (47) der zweiten Zylinder-Kolben-Einheit (40) gleich dem maximalen Volumen der zweiten Arbeitskammer (37) der ersten Zylinder-Kolben-Einheit (30) ist.
  8. Teleskopische Säule nach einem der vorhergehenden Ansprüche, wobei das erste Ende der Hebesäule (1) auf einer Basis plazierbar gestaltet ist.
  9. Teleskopische Hebesäule nach einem der vorhergehenden Ansprüche, wobei die Hebesäule (1) drei Rohrkörper (2, 3, 4) umfaßt und die hydraulische Betätigungseinheit (20) mit dem mittleren Rohrkörper (3) verbunden ist.
  10. Teleskopische Hebesäule nach Anspruch 9, bei der die Zylinder (31, 41) der hydraulischen Betätigungseinheit (20) fest mit dem mittleren Rohrkörper (3)-verbunden sind.
  11. Teleskopische Hebesäule nach Anspruch 9 oder 10, soweit dieser von Anspruch 8 abhängt, wobei der mittlere Rohrkörper (3) eine Grundplatte (21) aufweist, auf welcher der erste und der zweite Zylinder (31, 41) aufliegen.
  12. Teleskopische Hebesäule nach Anspruch 11, bei der die Grundplatte (21) des mittleren Rohrkörpers (3) mit einer Rückleitung (27) zur Abgabe von Hydraulikfluid, das aus der Betätigungseinheit (20) ausgetreten ist, an den unteren Rohrkörper (2) versehen ist.
  13. Teleskopische Hebesäule nach Anspruch 12, bei der die erste Abdeckplatte (14) mit einer Rückleitung (25) zur Abgabe von Hydraulikfluid aus dem unteren Rohrkörper (2) an einen Tank, das aus der Betätigungseinheit (20) ausgetreten ist, versehen ist.
EP05075090A 2005-01-11 2005-01-11 Teleskopische Hebesäule Not-in-force EP1679284B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP05075090A EP1679284B1 (de) 2005-01-11 2005-01-11 Teleskopische Hebesäule
DK05075090T DK1679284T3 (da) 2005-01-11 2005-01-11 Teleskopisk löftesöjle
DE602005007849T DE602005007849D1 (de) 2005-01-11 2005-01-11 Teleskopische Hebesäule
AT05075090T ATE399738T1 (de) 2005-01-11 2005-01-11 Teleskopische hebesäule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05075090A EP1679284B1 (de) 2005-01-11 2005-01-11 Teleskopische Hebesäule

Publications (2)

Publication Number Publication Date
EP1679284A1 EP1679284A1 (de) 2006-07-12
EP1679284B1 true EP1679284B1 (de) 2008-07-02

Family

ID=34937993

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05075090A Not-in-force EP1679284B1 (de) 2005-01-11 2005-01-11 Teleskopische Hebesäule

Country Status (4)

Country Link
EP (1) EP1679284B1 (de)
AT (1) ATE399738T1 (de)
DE (1) DE602005007849D1 (de)
DK (1) DK1679284T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101581354B (zh) * 2008-04-21 2012-01-11 梅西耶-布加蒂公司 带有主杆和辅助杆的致动器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2936292B1 (fr) * 2008-09-25 2011-07-22 Messier Bugatti Actionneur telescopique a tige principale et a tige auxiliaire

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU452690B2 (en) * 1970-11-17 1974-08-27 Cranes And Shovels Proprietary Limited Fluid operable extensible device
GB2176845B (en) * 1985-06-21 1989-04-26 600 Group Plc The Improvements in telescopic devices such as crane jibs
WO2002058615A2 (en) * 2001-01-25 2002-08-01 Hill-Rom Services, Inc. Hydraulic actuator apparatus for a surgical table

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101581354B (zh) * 2008-04-21 2012-01-11 梅西耶-布加蒂公司 带有主杆和辅助杆的致动器

Also Published As

Publication number Publication date
DK1679284T3 (da) 2008-10-20
ATE399738T1 (de) 2008-07-15
EP1679284A1 (de) 2006-07-12
DE602005007849D1 (de) 2008-08-14

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