EP3089935B1 - Hubvorrichtung nach art einer hebesäule - Google Patents

Hubvorrichtung nach art einer hebesäule Download PDF

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Publication number
EP3089935B1
EP3089935B1 EP14841363.6A EP14841363A EP3089935B1 EP 3089935 B1 EP3089935 B1 EP 3089935B1 EP 14841363 A EP14841363 A EP 14841363A EP 3089935 B1 EP3089935 B1 EP 3089935B1
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EP
European Patent Office
Prior art keywords
threaded rod
ratchet
lifting
ratchet wheel
rotation
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.)
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Application number
EP14841363.6A
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English (en)
French (fr)
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EP3089935A2 (de
Inventor
Eric Letellier
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Sefac
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Sefac
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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
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • 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
    • B66F7/025—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars screw operated

Definitions

  • the present invention relates to a lifting device, also called a lifting column, in particular a vehicle, comprising a substantially vertical column forming a frame and lifting means movable along said column under the action of the rotation control, by means suitable motors, a threaded rod and the displacement along the latter of a nut integral with a carriage on which can rest the load to be raised.
  • the present invention will find application in the field of handling devices, and, more particularly, lifting devices, especially vehicles.
  • lifting devices are such a vertical column forming a frame resting on the ground via a base.
  • lifting means comprising a movable carriage equipped with one or more horizontal arms.
  • the mobile carriage is guided in displacement along the column by means of guide means equipping the latter and complementary guide means which is equipped with this carriage.
  • the displacement control of the carriage is obtained, in particular, by means of a vertical threaded rod extending along the column and capable of being driven by motor means, in particular of electric type, equipping the head of column. Furthermore, a nut, secured to the lifting means, is mounted on the threaded rod so that, during the control in rotation of the latter, the nut goes up or down, thereby driving said lifting means.
  • the document FR 2 701 252 proposes the use, in combination with a reversible nut, of friction means capable of creating, during the descent of the lifting means, a resistant torque of moment greater than or equal to that of the torque produced by the load during its descent.
  • the system also comprises means capable of annihilating the effect of the friction means during the upward control of the lifting means. This reliable solution, however, requires a significant amount of energy when controlling the descent of the load.
  • the safety nut which is immediately placed under the lifting nut controlling the raising and lowering of the load.
  • This lifting nut is generally designed in a low friction material, especially bronze, knowing that in case wear, or even rupture of the thread of the lifting nut, it comes to rest on the safety nut. It is made of a stronger material, especially steel, which, on the other hand, provides a higher coefficient of friction. Also, only an emergency descent maneuver is generally possible when the load is no longer supported by the bronze nut but by this safety nut.
  • Another state of the art is to equip the column of a rack with which is engaged a ratchet.
  • This rack therefore extends substantially over the entire height of the column and in case of rupture of the lifting means, the tooth of the pawl in engagement with the rack prevents the fall of the load.
  • the rack-ratchet solution makes it possible to secure the lifting column, whatever the faulty means in terms of the kinematics of the lifting mechanism, it has the disadvantage that in case of rupture, it necessarily results in a fall of lift truck, so the load, a height corresponding to the pitch of the rack, in other words a distance corresponding to the spacing of two teeth on the rack.
  • the size of a tooth depends on the weight of the load that it is able to withstand.
  • this fall height in case of rupture is often of the order of two centimeters, which is far from negligible when it is known that the loads that can lift such lifting columns can be several tons.
  • the invention aims to overcome the disadvantages of the state of the art by providing an economical solution, which allows, in case of failure, to reduce the risk of falling load raised to a few millimeters or less.
  • This solution allows, again, the equipment of existing installations and their setting in security, with less cost and without requiring a long immobilization.
  • the invention relates to a lifting device, in particular a vehicle, comprising a column forming a frame, extending substantially vertically above a base and lifting means movable along said column under the action of the rotation control, by appropriate motor means, of a threaded rod and the displacement, along the latter, of a nut secured to a carriage on which the load to be lifted may rest, this lifting device comprising still fall protection means of the raised load, characterized in that the fall protection means comprises a pawl adapted to occupy at least a first unlocking position and a locking position in cooperation with at least one tooth of a wheel ratchet for locking in rotation the threaded rod, as well as holding means in unlocking position and return control means in the locking position.
  • the ratchet wheel or, respectively, the pawl is rotatably mounted on said threaded rod, while the pawl or respectively the ratchet wheel is secured to the column frame.
  • the return control means in the locking position of the pawl is in the form of a return spring tending to push it towards the ratchet wheel so as to engage against at least one tooth that comprises the latter.
  • the retaining means in the unclamping position of the pawl consist of an electromagnetic type actuator adapted to counter the force of said return spring to keep the pawl away from the grip of said tooth.
  • the electromagnet can receive the order not to keep the pawl in the unlocked position, so that, under the action of the spring it can engage against the next tooth that is present and block the rotation of the threaded rod.
  • the untimely fall of the nut and the carriage is thus limited to more than one turn of the threaded rod.
  • the ratchet wheel may comprise at least four teeth, preferably distributed at the periphery, making it possible to further reduce the untimely fall of the carriage in the event of failure of the motor means, which may represent a drop height of 2 or 3 millimeters or less.
  • said threaded rod may be suspended by its upper end and comprise a truncated cone at its lower end, adapted to cooperate with a frustoconical orifice associated with the base.
  • the frustoconical-shaped orifice with which the lower truncated cone end of said threaded rod cooperates, is formed in a workpiece in the form of a trolley made mobile in horizontal translation at the base , so as to avoid lateral support of the end of the threaded rod on the walls of the orifice in normal operation of the device. Indeed, during normal operation, the threaded rod is suspended and the load supported along the latter tends to give it deformations resulting in horizontal displacements of the end. bottom of this threaded rod.
  • the horizontal mobility trolley makes it possible to avoid introducing stresses between the truncated cone at the end of the threaded rod and the walls of the frustoconical orifice and thus to avoid friction which would otherwise slow down the rotation of the threaded rod and increase the power consumption for the operation of the device.
  • the invention relates to a lifting device 1, also called lifting column, designed in particular for lifting vehicles.
  • Such a device 1 comprises a column 2 forming a frame and extending substantially vertically above a base. It also comprises lifting means 4, which are movable along this column 2 under the action of the rotational control, by appropriate motor means 5, a threaded rod 6 and displacement along the latter , of a nut 7.
  • This lifting device 1 further comprises fall protection means 9 of the raised load.
  • these fall protection means 9 comprise a pawl 10 adapted to occupy at least a first unlocking position 11 and a locking position 12 in cooperation with at least one tooth 13 of a ratchet wheel 14 to lock the rod in rotation. Threaded 6. These fall arrest safety means 9 are completed by holding means 15 in unlocking position 11 of this pawl 10 and return control means 16 in locking position 12.
  • the ratchet wheel 14 is mounted to rotate with said threaded rod 6, while the pawl 10 is secured to the column 2 forming a frame. It should be noted, however, that a kinematic inversion can also be envisaged consisting in making the pawl 10 of the threaded rod 6 integral in rotation and in associating the ratchet wheel 14 integrally with the column forming the frame 2.
  • the fall protection means 9 take position at this upper end 17 suspended from the threaded rod 6.
  • the ratchet wheel 14 comprises at least one tooth 13, it preferably has several advantageously distributed evenly over its periphery, for example four, to divide by the same the fall height in case of failure.
  • this number of teeth 13 can of course vary according to the loads to be resumed, and the section of the ratchet wheel 14.
  • the loads are less important and / or the diameter of the ratchet wheel 14 larger, it is possible to have a larger number of teeth 13.
  • Even with a small number of teeth 13 such as four, the load can only fall in case of failure by a quarter of a turn of screw, corresponding to a few millimeters of fall.
  • the return control means 16 in the locking position 12 of the pawl 10, they are in the form of a return spring 20 tending to push it to an engagement position in the ratchet wheel 14 so as to engage against at least one tooth 13 that includes the latter.
  • the pawl 10 can be held pressed against the ratchet wheel 14 and in the event of failure of said motor means 5, the locking in position of the nut 7 is guaranteed.
  • the retaining means 15 in the unblocking position 11 of this pawl 10 consist of an actuator 21, preferably of the electromagnetic type, to keep the pawl 10 away from the tooth or teeth 13 of the ratchet wheel 14.
  • this actuator 21 is defined capable of holding the pawl 10 in this unlocking position 11, against the restoring force exerted by the return spring 20, to allow this pawl 10 to let through the teeth 13 of the ratchet wheel 14, in particular during the control of descent of the load.
  • the fall protection means 9 comprises a sensor device configured to detect a failure of the motor means 5.
  • these motor means 5 are usually a brake electric motor. electromagnetic operating by lack of current. More particularly, this brake blocks in rotation the drive shaft of the motor when the power supply of the latter is cut off. Thus, the rotation of the threaded rod is prevented. This is obviously not the case if this brake and / or the engine has a malfunction.
  • the sensor device in question comprises, for example, a current sensor combined with a rotation detector, for detecting a rotation of the motor shaft and / or the threaded rod despite the absence of current and, in this case, deactivate the actuator 21, in particular if it is an electromagnetic type actuator, to let the return spring 20 free to return the pawl 10 against the ratchet wheel 14 and, thus, to lock the rod in rotation threaded 6 from which stems the immobilization of the nut 7.
  • the actuator 21 is configured so that, in the event of a general power cut, it allows the return spring 20 to engage the pawl 10 against a tooth 13, so as to allow positive security: the fall is avoided in case of power failure.
  • the latter is shaped at its lower end 22 in the form of a truncated cone 23, which end 22 engages with a functional clearance 24 for ensure the free rotation of this threaded rod 6, in a frustoconical orifice 25 formed in a part 26 associated with the column forming frame 2, more particularly to the base above which this column 2 extends.
  • bearing means supporting the threaded rod 6 the latter is dropped, by fitting through its lower end 22, in the form of a truncated cone 23, in this frustoconical orifice 24, of a height proportional to the functional play 24, from which results an immediate blocking in vertical movement and in rotation of the threaded rod 6 preventing any fall of the load.
  • the part 26 comprising this frustoconical orifice 25 is movably defined in at least one direction of a substantially horizontal plane relative to said base.
  • this piece 26 is in the form of a carriage movable in horizontal translation, thus allowing, in normal operation, to absorb small horizontal movements of the lower end of the threaded rod 6, due to the deformation of this back following the variable forces applied to it by the load, through the carriage 8 and the nut 7.
  • this relative mobility of the part 26 and the functional clearance 24 the friction between the end 22 in truncated cone 23 and the frustoconical orifice 25 are negligible.
  • guiding means 27, in the form of slides, can be mounted on this base to allow this mobility in at least one determined horizontal direction of the carriage defined in the piece 26.
  • guiding means 27 in the form of slides, can be mounted on this base to allow this mobility in at least one determined horizontal direction of the carriage defined in the piece 26.
  • the deformations of the threaded rod 6 usually occurring in the same direction it is the same movements of the lower end 22 of the threaded rod 6 and the skilled person knows perfectly define these movements.
  • the advantages resulting from the present invention consists in a simplification of these fall protection means at a lifting device in the form of a lifting column. Of course, from this simplification also flows a gain in safety.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Transmission Devices (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (9)

  1. Hubvorrichtung, insbesondere eines Fahrzeugs, umfassend eine Säule (2), die einen Ständer bildet, die sich etwa vertikal über einer Grundplatte erstreckt, und entlang der Säule unter der Wirkung der Rotationssteuerung durch geeignete Motoren (5), eine Gewindestange (6) und die Verlagerung entlang dieser einer Mutter (7), die mit einem Schlitten (8) fest verbunden ist, auf dem die anzuhebende Last ruhen kann, bewegliche Hubmittel (4), wobei diese Hubvorrichtung (1) auch Absturzsicherungsmittel (9) der angehobenen Last aufweist, dadurch gekennzeichnet, dass diese Absturzsicherungsmittel (9) eine Sperre (10) aufweist, die imstande ist, mindestens eine erste entsperrte Position (11) und eine Sperrposition (12) in Zusammenarbeit mit mindestens einem Zahn (13) eines Sperrzahnrads (14) einzunehmen, um die Rotation der Gewindestange (6) zu blockieren, sowie Haltemittel (15) in entsperrter Position und Rückstell-Steuerungsmittel (16) in Sperrposition.
  2. Vorrichtung nach vorangehendem Anspruch, dadurch gekennzeichnet, dass das Sperrzahnrads (14) oder beziehungsweise die Sperre (10) auf der Gewindestange (6) rotierend fest verbunden ist, wogegen die Sperre (10) oder beziehungsweise das Sperrzahnrad (14) mit der einen Ständer bildenden Säule (2) fest verbunden ist.
  3. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Rückstell-Steuerungsmittel (16) in Sperrposition der Sperre (10) die Form einer Rückstellfeder (20) haben, die dazu neigt, sie zum Sperrzahnrad (14) derart zu drücken, dass sie auf mindestens einem Zahn (13) aufliegt, den dieses aufweist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Haltemittel (15) in entsperrter Position (11) der Sperre (10) von einem Aktuator (21) elektromagnetischen Typs gebildet sind, der imstande ist, der Kraft der Rückstellfeder (20) entgegenzuwirken, um die Sperre (10) vom Einfluss eines Zahns (13) beabstandet zu halten.
  5. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Sperrzahnrad (14) mindestens vier auf dem Umfang verteilte Zähne (13) aufweist.
  6. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Absturzsicherungsmittel (9) eine Sensorvorrichtung aufweisen, die konfiguriert ist, um eine Fehlfunktion der Motormittel (5) festzustellen und anhand der Rückstell-Steuerungsmittel (16) die Sperre (10) in ihre Sperrposition (12) zurückzudrücken.
  7. Vorrichtung nach den Ansprüchen 4 und 6, dadurch gekennzeichnet, dass die Sensorvorrichtung einen Stromdetektor in Kombination mit einem Rotationsdetektor aufweist, um eine Rotation der Motorwelle und/oder der Gewindestange trotz Abwesenheit von Strom festzustellen und den Aktuator (21) abzuschalten.
  8. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Gewindestange (6) an ihrem oberen Ende (17) aufgehängt ist, dadurch gekennzeichnet, dass die Gewindestange (6) ein unteres Ende (22) aufweist, das kegelstumpfförmig (23) ist, das mit einem Funktionsspiel (24) in eine Öffnung (25), die selbst kegelstumpfförmig ist, eingreift, die in einem der Grundplatte zugeordneten Teil (26) ausgebildet ist.
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Teil (26), das die kegelstumpfförmige Öffnung (25) aufweist, in Form eines Schlittens definiert ist, der auf Ebene der Grundplatte beweglich ist.
EP14841363.6A 2013-12-31 2014-12-30 Hubvorrichtung nach art einer hebesäule Active EP3089935B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1363730 2013-12-31
PCT/FR2014/053581 WO2015101754A2 (fr) 2013-12-31 2014-12-30 Dispositif de levage de type colonne de levage

Publications (2)

Publication Number Publication Date
EP3089935A2 EP3089935A2 (de) 2016-11-09
EP3089935B1 true EP3089935B1 (de) 2018-01-31

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Family Applications (1)

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EP14841363.6A Active EP3089935B1 (de) 2013-12-31 2014-12-30 Hubvorrichtung nach art einer hebesäule

Country Status (5)

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US (1) US20160332855A1 (de)
EP (1) EP3089935B1 (de)
AU (1) AU2014375098A1 (de)
CA (1) CA2932510A1 (de)
WO (1) WO2015101754A2 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105523510B (zh) * 2014-09-30 2018-03-02 苏州沃斯汀电梯有限公司 升降平台防坠落装置及包括它的升降平台设备
CN106185709A (zh) * 2016-07-27 2016-12-07 合肥航航空设备有限公司 一种锁块扣死式单柱举升机
CN113582100B (zh) * 2021-08-26 2022-11-22 广东工业大学 辅助室内高处作业施工小车
CN115849237B (zh) * 2022-11-09 2024-07-02 株洲颢益固机械有限公司 一种工厂货物升降机

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
US1795391A (en) * 1928-03-17 1931-03-10 Herman C Hansen Universal jack
US2129806A (en) * 1937-03-19 1938-09-13 Charles B Woodworth Lifting jack
US2876990A (en) * 1954-12-09 1959-03-10 Gen Motors Corp Lifting jack
DE2046397C3 (de) * 1970-09-19 1982-05-13 August Bilstein GmbH & Co KG, 5828 Ennepetal Wagenheber
US4169581A (en) * 1978-06-21 1979-10-02 Equipment Company Of America Trailer stabilizing jack
JPS5923457B2 (ja) * 1978-12-21 1984-06-02 株式会社東芝 立形巻線機
JPS6036298A (ja) * 1983-08-10 1985-02-25 富士電機株式会社 電動シリンダ
FR2701252B1 (fr) * 1993-02-08 1995-03-17 Sefac Equipement Dispositif de levage, notamment d'un véhicule.
US20060151247A1 (en) * 2004-12-08 2006-07-13 Maha Usa, Llc Electromagnetic release
FR2901780B1 (fr) * 2006-05-30 2009-03-06 Sefac Sa Dispositif de levage a ecrou parachute
US7404468B2 (en) * 2006-07-27 2008-07-29 Hiwin Technologies Corp. Elevator having second driving device
FR2917398B1 (fr) * 2006-09-29 2009-09-04 Sefac Sa Dispositif de levage
NL2000443C2 (nl) * 2007-01-18 2008-07-22 Imc Corporate Licensing B V Lier.
KR101047987B1 (ko) * 2009-07-09 2011-07-13 국방과학연구소 볼스크류용 자립장치 및 이를 구비하는 볼스크류 잭

Also Published As

Publication number Publication date
EP3089935A2 (de) 2016-11-09
CA2932510A1 (fr) 2015-07-09
AU2014375098A1 (en) 2016-07-07
WO2015101754A3 (fr) 2015-08-13
WO2015101754A2 (fr) 2015-07-09
US20160332855A1 (en) 2016-11-17

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