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EP0461638A1 - Dispositif de synchronisation pour une plate-forme de levage - Google Patents

Dispositif de synchronisation pour une plate-forme de levage Download PDF

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Publication number
EP0461638A1
EP0461638A1 EP91109652A EP91109652A EP0461638A1 EP 0461638 A1 EP0461638 A1 EP 0461638A1 EP 91109652 A EP91109652 A EP 91109652A EP 91109652 A EP91109652 A EP 91109652A EP 0461638 A1 EP0461638 A1 EP 0461638A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
control
piston
lifting
rod
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.)
Granted
Application number
EP91109652A
Other languages
German (de)
English (en)
Other versions
EP0461638B1 (fr
Inventor
Frank E. Sommerer
Wilfried Dipl.Ing. Pakull
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.)
SLIFT HEBEZEUG GmbH
Original Assignee
SLIFT HEBEZEUG 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 SLIFT HEBEZEUG GmbH filed Critical SLIFT HEBEZEUG GmbH
Publication of EP0461638A1 publication Critical patent/EP0461638A1/fr
Application granted granted Critical
Publication of EP0461638B1 publication Critical patent/EP0461638B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B66F7/20—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks by several jacks with means for maintaining the platforms horizontal during movement

Definitions

  • the invention relates to a synchronous device for a lifting platform with two, in particular hydraulic lifting cylinders, on the extendable elements of which a support member is arranged for the load to be lifted.
  • the two extendable elements are generally each the piston of the lifting cylinder, but in special cases it can also be an extendable cylinder in which the piston is mounted so that it can be extended.
  • the two support members are possibly elongated, plate-like elements, wherein in the case of a motor vehicle lifting platform, the left wheels of the vehicle and the right wheels drive onto the other.
  • we will only speak of a motor vehicle lift without this being intended to be restrictive.
  • only hydraulic lifting cylinders are used because the pneumatic because of the compressibility of the medium, at least in motor vehicle lifts, is usually of no importance.
  • the two lifting cylinders are usually fed by a common pressure source. For various reasons, for example due to different loads on the two support members, it can happen that one support member is raised faster than the other. This leads to an inclined position of the motor vehicle, which can be associated with considerable risk of accidents. The above naturally applies not only to the lifting of the motor vehicle, but also to the lowering, it being possible for the two supporting members to have the same stroke position at the beginning.
  • a toothed rack is attached directly or indirectly to each support member, which is raised and lowered together with the support member.
  • a toothed pinion meshes in a fixed, rotating manner with each rack. Because these two pinions are rotatably coupled via a shaft, they inevitably have to rotate at the same speed and as a result the two racks can can only be raised and lowered at the same speed, which then causes the synchronism of the two support members.
  • the racks and of course the pinions must be protected from dirt and damage. With the pinions, this is relatively easy in the case of a pit for the lifting platform, but not with the toothed racks, because they extend beyond the top of the pit. In addition, even if the racks are tightly encircled in the area of the upper pit edge, dirt can get into the pit via the tooth gaps and thus reach the pinions stored there. What applies to dirt is especially true for water.
  • the object of the invention is therefore to develop a synchronous device of the type described above so that the ingress of dirt, water and the like. is prevented in the area of the extendable parts of the synchronizing device in the passage area of a pit cover or the like.
  • the stroke-determining means are connected to the two supporting members of this lifting platform, which act on a common control mechanism which compensates for a possible stroke difference. If, for example, one support member is raised faster than the other support member, the control means assigned to the other support member causes an increased control via the control member Inflow of the pressure medium used, which as long as a faster lifting of this initially lagging support member results until this second support member is raised to the same height as the first support member and thus the equality of both support members has been achieved again.
  • a particularly expedient embodiment of this synchronizing device is characterized in that a synchronizing rod extending in the direction of displacement of the extendable element is connected to each support member and these two synchronizing rods are each connected via a joint to a control rod serving as the respective stroke determining means, and in that at a distance from one of these joints, a control cylinder is articulated at both ends to one of the synchronizing rods and the control rod, the connections of which serve as inputs for lifting with the pressure source of the medium and the outputs of which are each flow-connected to the input of one of the lifting cylinders, and that for single-acting lifting cylinders a shuttle valve is connected between the latter and the control cylinder or a control cylinder is inserted between each synchronous rod and the control rod, with the returning medium from the lifting cylinders via the switched over stopped change valve and the control cylinder or flows via the second control cylinder to a liquid container.
  • This particular design of the synchronizing device according to the invention dispenses with toothed racks and instead provides for the use of synchronizing rods which have a smooth outer jacket and, for example, have a round or rectangular cross section. If they penetrate a cover, in particular a pit cover, the passage point can be sealed in any position of the support members without any problems.
  • synchronous racks with a conventional, in particular circular, cross-sectional profile are comparatively simple components which cause significantly lower costs than racks which one has to manufacture in motor vehicle lifts from particularly high-quality and therefore expensive and expensive to machine material.
  • the extendable element connected to the support member of one lifting cylinder extends faster than that of the other support member, this leads to a pivoting of the control rod about its two bearing ends. It takes an inclined position in relation to its starting position. This also causes a change in position of the joint or the joints of the control cylinder or relative to the other joint on the synchronizer rod. In other words, the distance between the two joints of the or each control cylinder changes and this leads to a displacement of the control piston in the cylinder of the or each control cylinder.
  • This displacement movement of the control piston effects a control of the flow in the sense that, for example, when lifting the load, the leading lifting cylinder is fed less and the lagging more medium is supplied.
  • the control piston in the cylinder of its control cylinder also returns to its starting position, the control piston being returned just as steadily as the tracking support member being tracked.
  • the control rod is preferably assigned to the lower ends of the synchronizing rods. This means that the control cylinder (s) are located above the control rod. Overall, the arrangement is such that the control cylinders do not reach a pit cover or the upper pit edge in any position of the lifting cylinders.
  • a further development of the invention provides that the geometric axis of the control rod extends approximately perpendicular to that of the synchronizing rods and the geometric axis of the control piston of the or each control cylinder encloses an angle of approximately 45 ° with the geometric axis of the control rod. Of course, this also includes an angle of approximately 45 ° with the geometric axis of the assigned synchronizing rod. Both apply to the initial position or the correct stroke position of both support members.
  • Another embodiment of the invention is that the cylinder of the control cylinder is articulated to the control rod and a piston rod connected to the piston of the control cylinder is articulated to the associated synchronizing rod, but the reverse arrangement is also possible.
  • the two hinge axes of the control cylinder run perpendicular to the plane defined by the synchronous rods and the control rod, the preferred case being that the control rod is at least approximately in the vertical plane defined by the two synchronous rods.
  • a particularly simple and therefore also inexpensive to produce embodiment of this synchronizing device is characterized in that two cables or chains or the like are used as the means determining the respective stroke of the two support members. are provided, which are fastened on the one hand to the support members and, on the other hand, wound on a horizontal, fixed, rotatably mounted shaft, the two mutually facing ends of which are connected in a rotationally fixed manner to the compensating control element.
  • a hydraulic rotary valve having an inlet connection and two outlet connections can be provided, in its sleeve-like housing pivotable about its longitudinal central axis, two interlocking and mutually rotatable slide bodies with at least one radial inlet bore, one central distributor bore and at least two radial outlet bores are stored.
  • the lifting platform is installed in a pit 1 and has two hydraulic lifting cylinders 2 and 3.
  • the extendable element of each lifting cylinder in particular a piston 4 or 5, carries a support member 6 or, at its free, upper end in use. 7.
  • the lifting platform is preferably used for lifting motor vehicles, in which case, for example, the left support member 6, the two left wheels and the right support member 7 support the two right wheels of the motor vehicle to be lifted. It is obvious that the two support members 6 and 7 must be at the same height in each stroke position, otherwise the vehicle will assume an inclined position. For various reasons, but especially if the right side of the lift is heavier than the left or vice versa, it can happen without special measures that when lifting or lowering the vehicle one support member leads the other.
  • the synchronism of the two support members is achieved with the aid of a synchronizing device, which is described in more detail below.
  • a synchronizing device which is described in more detail below.
  • synchronous devices are already known. Instead of the toothed racks protruding there above when the support members are raised above the pit edge 6, the synchronizing device according to the invention of the lifting platform provides for the use of two synchronizing rods 9 and 10.
  • the upper end of each synchronous rod is connected directly or indirectly to the associated support member.
  • the synchronizing rods have a simple, for example a circular cross section, so that they can be sealed and passed through a pit cover in the area of the plane of the pit edge 8 upwards without any problems. In this way, dirt and water are prevented from penetrating the passage of each synchronous rod.
  • the two synchronizing rods are connected to one another, in particular at their lower end, via a control rod 11.
  • the connection takes place in each case via a schematically drawn joint 12 or 13.
  • the control rod 11 running in the starting position or in a parallel stroke position of the support members 6 and 7 perpendicular to the synchronizing rods 9 and 10 can assume the inclined position shown in FIG. 1 with dashed lines .
  • This oblique position is associated with the lagging position of the support member 7, which is also shown in broken lines in FIG. 1. Only for the sake of order it is added at this point that the two synchronized rods 9 and 10 are of course parallel to the geometric axis of the associated hydraulic lifting cylinder 2 and 3 and thus also extend parallel to the stroke direction 14 of the two support members 6 and 7.
  • a control cylinder 19 or 20 is mounted on a schematically drawn further joint 15, 16 or 17, 18, respectively. If, as in the exemplary embodiment, the control rod 11 is located at the lower ends of the synchronizing rods 9 and 10, the control cylinders 19 and 20 lie above the control rod 11.
  • the distance between the further joints 15 and 16 from the associated joint 12 or the further joints 17 and 18 of the associated joint 13 is preferably chosen to be the same, so that the geometric axis of each control cylinder with the geometric axes of the control rod on the one hand and the associated synchronizing rod on the other hand is 45 ° in each case. From the latter it follows that the lower end of each control cylinder 19 or 20 is articulated on the control rod 11, while the upper end is articulated in a manner not shown with the associated synchronous rod 9 or 11.
  • Each control cylinder 19 consists of a cylinder 21 or 22 and a piston 23 or 24.
  • a rod 25 serves for the articulated connection of the cylinder 21 via the joint 16 to the control rod 11, while a rod 26 supports the cylinder 22 via the joint 18 the control rod connects.
  • the piston 23 of the control cylinder 19 is connected to a piston rod 27, while between the piston 24 and the joint 17 a piston rod 28 of the control cylinder 20 is inserted.
  • each outlet 32, 33 is hydraulically connected to the other control cylinder 20 via further lines 34 and 35. From there, a return line 36 leads to a symbolically drawn collecting container 37 for the hydraulic fluid. From this the pump sucks the medium again, whereby it first flows through a filter 38. Before it reaches the control cylinder 19, it preferably flows through a pressure relief valve 39.
  • FIG. 2 shows the schematic hydraulic diagram for the first embodiment of the synchronizing device shown in FIG. 1.
  • the medium under pressure exits via the line 40, from which a branch line 41 branches off before reaching the control cylinder 19, but which can also be connected directly to the pressure relief valve.
  • the piston of each control cylinder 19 or 20 is provided with three annular grooves, so that annular spaces 42 and 43 or 52 and 53 are formed.
  • the line 40 opens directly into the annular space 42 on the left in FIG. 2 if no cylindrical annular space is assigned to it, while the branch line 41 is hydraulically connected to the annular space 43.
  • the line 30 exits the annular space 42 and the line 31 exits the annular space 43.
  • a check valve 44 is installed in the former and a check valve 45 is installed in the latter. This is part of a magnetic changeover valve 46. In this way it can be switched from one-sided passage to the lifting cylinder to double-sided passage, whereby a hydraulic connection path from the cylinder space 47 of the lifting cylinder 2 to the further line 34 can be created, this path when switching the lift release on lowering by actuating the solenoid switch valve 46.
  • the inlets and outlets for the lines 40, 41 and 30, 31 of the control cylinder 19 - and of course the same also applies to the control cylinder 20 - are so matched to the width of the ring grooves that the control of the hydraulic flows described below when moving the piston 23 with the help of the control rod 11 can cause.
  • check valves 48 and 49 are inserted into lines 31 and 35, respectively.
  • the check valve 49 is part of the magnetic changeover valve 50.
  • the cylinder space of the right hydraulic lifting cylinder 3 is designated 51.
  • the two annular spaces of the control cylinder 20 bear the reference numbers 52 and 53.
  • the branch line 54 is connected to the latter. Due to the annular grooves, the piston 23 is divided into the two outer elements 57 and 58 and a middle element 59. Corresponding elements 60 and 61 and 62 have the piston 24.
  • a cylinder annular space preferably of smaller width, can be assigned to each piston annular space.
  • a displacement of the piston 23 in the direction of the arrow 63 and the piston 24 in the direction of the arrow 66 corresponds to these displacement movements in FIG. 2 applies to lines 40 and 41- this piston displacement causes a reduction in the outflow cross-section to line 30 and / or the inflow cross-section from line 40 with the help of the outer element 57 and at the same time an increase in the inflow cross-section of line 41 and / or the outflow cross-section to line 31 by means of the right outer element 58 of the piston 23. From this it follows that the right edge of the outer element 57 on the one hand and the left edge of the right outer element 58 are respectively control edges for the corresponding cylinder annular spaces or the inflow and outflow cross sections of the four lines . The same naturally applies to the right control cylinder 20.
  • the left cylinder space 47 of the left hydraulic cylinder 2 becomes less Medium supplied as the right cylinder chamber 51 of the right hydraulic lifting cylinder 3.
  • the control rod 11 also returns to its starting position and thus the center position or starting position of the control pistons 23 and 24 is reached again.
  • the trailing position of the support member 7 is shown in FIG. 1 exaggerated for clarity. In reality, there is constant regulation in the sense mentioned.
  • a control cylinder 19 is sufficient.
  • a shuttle valve 67 is used here.
  • the line 30 is hydraulically connected to the line 68 to the check valve 45 of the magnetic changeover valve 46, while when LOWERING, a hydraulic connection of the line 30 via the line 69 and the check valve 49 of the magnetic changeover valve 50 to the cylinder chamber 51 is created.
  • This switching from straight passage to crossover passage on shuttle valve 67 achieves, on the one hand, tracking of the remaining support member and, on the other hand, lowering of the lagging support member.
  • the two magnetic changeover valves 46 and 50 must of course also be switched over here. It remains to be added that in the LIFT 31 with 69 and in the LOWER 69 with 30.
  • an electromagnetically reversible magnetic changeover valve 70 is also used in the latter.
  • lifting is the passage blocked on the solenoid changeover valve 70, while it is released during lowering by reversing this solenoid changeover valve.
  • a check valve 71 is inserted before the branching of the line 41.
  • a further check valve 72 is inserted in the return line 36 to the liquid container 37, which prevents the pressure medium from flowing directly into the liquid container 37 when the support members 6 and 7 are LIFTED.
  • the check valve 72 is part of the magnetic changeover valve 70. This is switched to free passage when the support members 6 and 7 are LOWERED.
  • FIG. 4 shows a third embodiment of the synchronizing device according to the invention, in which the same components are again identified by the same reference numerals.
  • two horizontal shafts designated 73 and 74
  • Cable drums 78 are arranged on the two outer ends 76 and 77 of these two shafts 73 and 74, on each of which an associated cable 79, 80 is wound.
  • the free ends 81 and 82 of these two cables 79 and 80 are attached to the supporting members 6 and 7 belonging to the two lifting devices 2 and 3.
  • the two inner ends 83 and 84 of these horizontal shafts 73 and 74 on the other hand, a control slide 85, which compensates for a possible stroke difference, is connected in a rotationally fixed manner to a rotary slide valve (not shown).
  • the function of this design of the synchronizing device is particularly simple. As soon as a stroke difference occurs during operation of the lifting device, the cable runs 86 and 87 located between the two cable drums 78 and the support members 6 and 7 have different lengths 1 1 and 1 2, which causes a rotation of the two horizontal shafts 73 and 74 and thus also of the two Rotary slide of the control member 85 results. When the two rotary valves are rotated relative to one another, however, the flow cross-sections of the control member 85 change in such a way that a somewhat larger amount of pressure oil is now supplied to the currently trailing lifting cylinder of the relevant lifting device 2 or 3, and the existing stroke difference is thus compensated for.
  • the hydraulic plan shown in FIG. 5, which largely corresponds to the hydraulic plan according to FIG. 3, belongs to this third design. In this case, however, instead of the control cylinder 19 shown in FIG. 3, the control member 85 already treated, which is equipped with two rotary valves, is provided.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)
EP91109652A 1990-06-15 1991-06-12 Dispositif de synchronisation pour une plate-forme de levage Expired - Lifetime EP0461638B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9006739U DE9006739U1 (de) 1990-06-15 1990-06-15 Gleichlaufvorrichtung für eine Hebebühne
DE9006739U 1990-06-15

Publications (2)

Publication Number Publication Date
EP0461638A1 true EP0461638A1 (fr) 1991-12-18
EP0461638B1 EP0461638B1 (fr) 1995-08-09

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ID=6854694

Family Applications (1)

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EP91109652A Expired - Lifetime EP0461638B1 (fr) 1990-06-15 1991-06-12 Dispositif de synchronisation pour une plate-forme de levage

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EP (1) EP0461638B1 (fr)
DE (2) DE9006739U1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0698575A1 (fr) * 1994-08-26 1996-02-28 PERKUTE Maschinenbau GmbH Elévateur, en particulier pour véhicules automobiles
CN1903698B (zh) * 2006-08-04 2011-07-20 长江三峡通航管理局 多点同步升降装置及其升降方法
EP2195541A4 (fr) * 2007-09-21 2012-07-04 Snap On Tools Canada Ltd Systeme et dispositif pour synchroniser une pluralite d'elements actionnes hydrauliquement

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9006739U1 (de) * 1990-06-15 1990-08-23 Slift Hebezeug GmbH, 7533 Tiefenbronn Gleichlaufvorrichtung für eine Hebebühne
DE9109630U1 (de) * 1991-08-03 1991-09-19 Slift Hebezeug GmbH, 7533 Tiefenbronn Gleichlaufvorrichtung für eine Antriebsachse
CN102602846B (zh) * 2012-04-01 2016-01-20 杨田花 带保顶全自动升降系统

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1455068A (fr) * 1966-12-28
GB1137333A (en) * 1967-06-27 1968-12-18 Joyce Cridland Co Two-vehicle lift structure
GB1157291A (en) * 1965-10-21 1969-07-02 Sperry Rand Ltd Improvements in Hydraulic Systems
GB2010217A (en) * 1977-12-12 1979-06-27 Itt Hydraulic moving device
DE3515762A1 (de) * 1985-05-02 1986-11-06 Zippo Gesellschaft für Hebetechnik mbH, 7600 Offenburg Mehrsaeulen-hebebuehe od. dgl. und verfahren zur gleichlaufsteuerung ihrer hubelemente
DE8900545U1 (de) * 1989-01-19 1989-03-02 Slift Hebezeug GmbH, 7533 Tiefenbronn Hebebühne
DE9006739U1 (de) * 1990-06-15 1990-08-23 Slift Hebezeug GmbH, 7533 Tiefenbronn Gleichlaufvorrichtung für eine Hebebühne

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708986A (en) * 1948-09-29 1955-05-24 Joyce Cridland Co Vehicle lift
US2849084A (en) * 1954-09-09 1958-08-26 Joyce Cridland Co Flush floor mounted safety latch for hydraulic lifts
US3279562A (en) * 1964-07-17 1966-10-18 Dover Corp Equalizer for a vehicle lift
DE1481120C3 (de) * 1966-11-18 1973-10-18 Clark Equipment Co., Buchanan, Mich. (V.St.A.) Portallader mit Hubausgleich
FR2181246A5 (fr) * 1972-04-20 1973-11-30 Verlinde Sa
DE2234562A1 (de) * 1972-07-14 1974-01-31 J P Sauer & Sohn Gegruendet 17 Hydraulische gleichlaufsteuerung
AT347638B (de) * 1975-04-11 1979-01-10 Walter Vogler Hebeeinrichtung
DE3338218C2 (de) * 1983-10-21 1986-05-28 Mannesmann Rexroth GmbH, 8770 Lohr Gleichlaufeinrichtung für mindestens zwei Hubtische mit hydraulischen Arbeitszylindern

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1455068A (fr) * 1966-12-28
GB1157291A (en) * 1965-10-21 1969-07-02 Sperry Rand Ltd Improvements in Hydraulic Systems
GB1137333A (en) * 1967-06-27 1968-12-18 Joyce Cridland Co Two-vehicle lift structure
GB2010217A (en) * 1977-12-12 1979-06-27 Itt Hydraulic moving device
DE3515762A1 (de) * 1985-05-02 1986-11-06 Zippo Gesellschaft für Hebetechnik mbH, 7600 Offenburg Mehrsaeulen-hebebuehe od. dgl. und verfahren zur gleichlaufsteuerung ihrer hubelemente
DE8900545U1 (de) * 1989-01-19 1989-03-02 Slift Hebezeug GmbH, 7533 Tiefenbronn Hebebühne
DE9006739U1 (de) * 1990-06-15 1990-08-23 Slift Hebezeug GmbH, 7533 Tiefenbronn Gleichlaufvorrichtung für eine Hebebühne

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0698575A1 (fr) * 1994-08-26 1996-02-28 PERKUTE Maschinenbau GmbH Elévateur, en particulier pour véhicules automobiles
CN1903698B (zh) * 2006-08-04 2011-07-20 长江三峡通航管理局 多点同步升降装置及其升降方法
EP2195541A4 (fr) * 2007-09-21 2012-07-04 Snap On Tools Canada Ltd Systeme et dispositif pour synchroniser une pluralite d'elements actionnes hydrauliquement

Also Published As

Publication number Publication date
EP0461638B1 (fr) 1995-08-09
DE59106192D1 (de) 1995-09-14
DE9006739U1 (de) 1990-08-23

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