EP0028748A2 - Plate-forme de levage hydraulique - Google Patents

Plate-forme de levage hydraulique Download PDF

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Publication number
EP0028748A2
EP0028748A2 EP80106529A EP80106529A EP0028748A2 EP 0028748 A2 EP0028748 A2 EP 0028748A2 EP 80106529 A EP80106529 A EP 80106529A EP 80106529 A EP80106529 A EP 80106529A EP 0028748 A2 EP0028748 A2 EP 0028748A2
Authority
EP
European Patent Office
Prior art keywords
lifting
check valve
cylinder
pump
lifting platform
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.)
Withdrawn
Application number
EP80106529A
Other languages
German (de)
English (en)
Other versions
EP0028748A3 (fr
Inventor
Hans Dipl.-Ing. Nussbaum
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.)
Otto Nussbaum GmbH and Co KG
Original Assignee
Otto Nussbaum GmbH and Co KG
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 Otto Nussbaum GmbH and Co KG filed Critical Otto Nussbaum GmbH and Co KG
Publication of EP0028748A2 publication Critical patent/EP0028748A2/fr
Publication of EP0028748A3 publication Critical patent/EP0028748A3/fr
Withdrawn legal-status Critical Current

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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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
    • B66F7/16—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks
    • 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
    • B66F7/04—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars hydraulically or pneumatically operated

Definitions

  • the invention relates to a hydraulic lifting platform, and the object of the invention is to provide a structure that is as simple as possible, but nevertheless reliable.
  • a pump is provided with two delivery directions, the lifting cylinder being able to be acted upon by a check valve through the one delivery line and the check valve being hydraulically unlocked by the other delivery line.
  • valves susceptible to failure such as a directional control valve used in known embodiments.
  • a conventional motor can be provided for driving the pump, as is used for lifting platforms with a lifting spindle.
  • Fig. 1 shows a two-stage synchronous T p leskopzylinder 1 , in the cylinder body 2, a hollow piston 3 is slidably arranged, which has an annular shoulder at the lower end and a reduced compared to the inner diameter of the cylinder 2, so that between this hollow piston 3 and the cylinder 2, an annular space 4 is present.
  • a piston 5 is arranged displaceably in the hollow piston 3.
  • the interior 6 of the hollow piston 3 communicates with the annular space 4 via an overflow opening 7 arranged at the lower end of the hollow piston 3.
  • a closable vent hole is designated at the upper end of the cylinder 2.
  • the interior 9 of the cylinder 2 communicates with the interior 6 of the hollow piston 3 via a check valve 10.
  • a hydraulically unlockable check valve 12 is arranged, which is shown in detail in Fig. 2.
  • the spring-loaded ball 13 of the check valve can release the passage to the cylinder inlet 11 by pressurizing the line 14 or by pressurizing the line 15 so that a piston 16 provided with a plunger unlocks the check valve.
  • the lines 14 and 15 are each connected to one side of a pump 17 which has two delivery directions and is driven by a motor 18 which can be switched from one direction of rotation to the other in a manner known per se .
  • Two check valves 20, 21 and two pressure relief valves 22 and 23 are arranged in this distributor block i9.
  • the pump 17 can draw hydraulic fluid from a container 25 via the check valve 20 in one direction of rotation via a filter 24 and act on the reciprocating piston 5 via the delivery line connected to the line 14.
  • the pump feeds back into the container 25 via the pressure-limiting valve 23.
  • the pump 17 sucks in hydraulic fluid via a filter 26 and check valve 21 and delivers it via line 15 to unlock the check valve 12, excess hydraulic fluid is conveyed back into the container 25 via the pressure relief valve 22.
  • Fig. 3 shows a known two-pillar overhead lift.
  • the lifting cylinder 1 In the left lifting column with the drive motor 18 at the upper end, the lifting cylinder 1 is arranged in the lower part, the lifting carriage 27 provided with the support arms being firmly connected to the free end of the piston 5.
  • the pump 17 with the distributor block 19 is arranged in a unitary housing block at the upper end of the lifting column and combined with the motor 18 to form one structural unit.
  • a chain 28 is mounted resiliently, that is connected via guide rollers to the lifting carriage 29 on the opposite lifting column and this Trä b t.
  • This lifting carriage 29 is provided with a safety catch, as described in DE-OS 26 49 769.
  • the lifting carriage 29 is displaceable along a catching rod, a spring-loaded element lying against the chain clamping the lifting carriage on the catching rod as soon as this chain or a rope becomes slack or breaks.
  • the resilient suspension of the chain can, as indicated in DE-OS 26 49 769, be formed.
  • the motor, the pump and the distributor block are screwed directly to one another, so that no connection lines susceptible to faults have to be provided between these components.
  • the pump with two delivery directions in connection with the distributor block 19 eliminates a normally used directional valve, which is also more prone to failure in relation to the components used according to the invention.
  • the hydraulically unlockable check valve 12, which can be screwed directly onto the lifting cylinder 1, ensures a high level of safety in the event of a motor or pump failure.
  • the lifting carriage By attaching the lifting carriage to the piston 5, the lifting carriage is pushed up without any auxiliary means, such as a rope, chain or linkage, so that in connection with the check valve 12 an additional securing means, such as a catching rod, can be omitted.
  • any auxiliary means such as a rope, chain or linkage
  • the lift works as follows: The pump 17 sucks in hydraulic fluid via the filter 24 and presses it into the line 14. The spring force at the check valve 12 is overcome, so that the hydraulic fluid first flows into the cylinder chamber 9. During the filling process, the vent hole 8 is free given so that the hydraulic fluid flows from the cylinder chamber 9 via the check valve 10 into the interior 6 of the hollow piston and via the overflow opening 7 into the annular space 4. If the annular space 4 is completely filled with hydraulic fluid when the piston 5 is retracted, the vent hole 8 is closed. By further supplying hydraulic fluid via the inlet line 11, the hollow piston 3 is raised and the lifting piston 5 is thus extended.
  • the described arrangement and switching of a pump 17 with two delivery directions, a distributor block 19 and a hydraulically unlockable check valve 12 can be used with different lifting platforms. It is preferably used in the two-post above-ground lift described in connection with a safety catch on the lifted lift. For this configuration, the same components can be used as are provided in such a lift according to DE-CS 26 49 769 or 27 42 961, only the nut-spindle system being replaced by the lifting cylinder 1 and the drive motor Pump 17 is screwed to manifold block 19.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP80106529A 1979-10-26 1980-10-24 Plate-forme de levage hydraulique Withdrawn EP0028748A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792943370 DE2943370A1 (de) 1979-10-26 1979-10-26 Hydraulische hebebuehne
DE2943370 1979-10-26

Publications (2)

Publication Number Publication Date
EP0028748A2 true EP0028748A2 (fr) 1981-05-20
EP0028748A3 EP0028748A3 (fr) 1981-05-27

Family

ID=6084487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106529A Withdrawn EP0028748A3 (fr) 1979-10-26 1980-10-24 Plate-forme de levage hydraulique

Country Status (2)

Country Link
EP (1) EP0028748A3 (fr)
DE (1) DE2943370A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372176A1 (fr) * 1988-10-29 1990-06-13 MASCHINENFABRIK J.A. BECKER U. SÖHNE NECKARSULM GMBH & CO. KG. Installation de levage hydraulique, en particulier plate-forme de levage à deux ou plusieurs piliers
FR2709519A1 (fr) * 1993-08-31 1995-03-10 Sefac Equipement Vérin simple effet, en particulier, vérin de levage notamment pour véhicule.
CN112062034A (zh) * 2020-09-08 2020-12-11 广东技术师范大学 一种机器人运输装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1288529A (fr) * 1961-05-04 1962-03-24 Groupe moto-pompe réversible à commande automatique applicable notamment aux monte-charge et ascenseurs
DE1188400B (de) * 1961-06-24 1965-03-04 Teves Kg Alfred Rueckschlagventil mit OEffnung durch einen druckbeaufschlagten Kolben
GB1072375A (en) * 1963-07-04 1967-06-14 Hanseatische Ind Beteiligungen Lifting platforms for automobiles
US3461959A (en) * 1965-08-19 1969-08-19 Martin B Conrad Retrievable bridge plug
US3395777A (en) * 1967-04-28 1968-08-06 Rodosta John Automobile lift
DE2810579A1 (de) * 1978-03-11 1979-09-20 Schwelm & Towler Hydraulics Leitungsbruchsicherung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372176A1 (fr) * 1988-10-29 1990-06-13 MASCHINENFABRIK J.A. BECKER U. SÖHNE NECKARSULM GMBH & CO. KG. Installation de levage hydraulique, en particulier plate-forme de levage à deux ou plusieurs piliers
FR2709519A1 (fr) * 1993-08-31 1995-03-10 Sefac Equipement Vérin simple effet, en particulier, vérin de levage notamment pour véhicule.
CN112062034A (zh) * 2020-09-08 2020-12-11 广东技术师范大学 一种机器人运输装置

Also Published As

Publication number Publication date
EP0028748A3 (fr) 1981-05-27
DE2943370A1 (de) 1982-05-27

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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PUAL Search report despatched

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Designated state(s): AT BE CH DE FR GB IT LU NL SE

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17P Request for examination filed

Effective date: 19811126

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Effective date: 19830826

RIN1 Information on inventor provided before grant (corrected)

Inventor name: NUSSBAUM, HANS, DIPL.-ING.