EP0372176B1 - Hydraulische Hubeinrichtung, insbesondere Zweisäulen- oder Mehrsäulen-Hebebühne - Google Patents

Hydraulische Hubeinrichtung, insbesondere Zweisäulen- oder Mehrsäulen-Hebebühne Download PDF

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Publication number
EP0372176B1
EP0372176B1 EP19890117332 EP89117332A EP0372176B1 EP 0372176 B1 EP0372176 B1 EP 0372176B1 EP 19890117332 EP19890117332 EP 19890117332 EP 89117332 A EP89117332 A EP 89117332A EP 0372176 B1 EP0372176 B1 EP 0372176B1
Authority
EP
European Patent Office
Prior art keywords
stage
piston
telescopic
hydraulic lifting
arrangement according
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.)
Expired - Lifetime
Application number
EP19890117332
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German (de)
English (en)
French (fr)
Other versions
EP0372176A1 (de
Inventor
Hans Dipl.-Ing. Böck
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.)
Maschinenfabrik Ja Becker U Sohne Neckarsulm & Co Kg GmbH
Original Assignee
Maschinenfabrik Ja Becker U Sohne Neckarsulm & Co Kg 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.)
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Publication date
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Publication of EP0372176A1 publication Critical patent/EP0372176A1/de
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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 hydraulic lifting device, in particular two-column or multi-column lifting platform, with the features in the preamble of claim 1.
  • the plungers are designed as two-stage telescopic cylinders of the plunger type, in which the stages are extended one behind the other.
  • the punches are firmly and rigidly connected to an inverted U-shaped unit with the aid of a common lifting crossbar.
  • This lifting traverse extends as a rigid part over all stamps. This should eliminate the need for synchronism controls, because the rigid connection of the upper punch ends in the load bearing area with the common lifting traverse ensures synchronism when lifting and lowering.
  • Another known lifting device (US-A-27 50 004) has two spaced-apart single-stage working cylinders which are coupled via a mechanical synchronous control device, which distributes force in a non-positive and positive manner with the aid of mechanical links, e.g. Pinion, shaft and racks or chains and sprockets instead.
  • a link in this mechanical synchronism control e.g. a rack engages at the upper end of the extending piston and thus in the load bearing area.
  • the mechanical synchronizing means attacks the last stage in the same way as in DE-A-32 35 829.
  • the rack extends downward over a length corresponding at least to the entire extension stroke for lifting.
  • this lifting device has a relatively simple mechanical synchronization control device, it has the disadvantage of a relatively small extension stroke with a relatively large overall depth. The ratio of the extension stroke to the overall depth is unfavorable and significantly smaller than 1.
  • the invention has for its object to provide a hydraulic lifting device of the type mentioned in the preamble of claim 1, in which reliable synchronization of the lifting / lowering movement of both telescopic cylinders is made possible by simple means despite the two-stage design for each telescopic cylinder.
  • the invention has overcome this and takes advantage of the knowledge that in an at least two-stage synchronous telescopic cylinder, the second stage is hydraulically connected to the first stage and hydraulically positively coupled, and thus when a mechanical synchronous control acts on the first telescopic stage in accordance with the invention , a reliable synchronization control of this stage and the second stage is made possible with simple means.
  • the synchronization control is simple, inexpensive and reliable in terms of construction.
  • a hydraulic lifting device with at least two synchronous telescopic cylinders is thus created with simple means, each of which is at least two-stage and nevertheless experiences simple and reliable synchronization when lifting and lowering.
  • the hydraulic lifting device shown in the drawings is designed here as a two-column lifting platform 10 which has two lifting units 11 and 12 which are arranged at a distance from one another and which together can lift and lower a load synchronously.
  • Each lifting unit 11 and 12 has an at least two-stage telescopic cylinder 13 and 14, respectively. These are each arranged in a bottom recess, pit or the like, at least substantially recessed, and are each effective for themselves without a bridge connecting the two telescopic cylinders 13, 14 being present.
  • the telescopic cylinders 13, 14 are at the required longitudinal distance when arranged one behind the other or transverse distance arranged from each other. At the free upper end of each telescopic cylinder 13,14 not shown shots, ramps or the like.
  • the drive-up direction for the vehicles in Fig. 1 is illustrated by arrow 15 or extends transversely thereto.
  • Each telescopic cylinder 13, 14 has at least two stages. Details are explained below with reference to FIG. 2 using the example of the telescopic cylinder 13 shown there.
  • the first stage of the telescopic cylinder 13 has an outer cylinder tube 16 and a piston 17 which is displaceable therein and which is designed as a disk piston 18 acting on both sides.
  • the piston 17 is fixedly attached to one end 19 of a hollow cylinder 20 located at the bottom in FIG. 2.
  • the hollow cylinder 20 thus represents, as it were, the piston rod of the disk piston 18, the hollow cylinder 20 and also the disk piston 18 being displaceable and tightly guided in the interior of the outer cylinder tube 16, such that 18 pressure chambers 21 and 22 are formed on both sides of the disk piston.
  • the hollow cylinder 20 is fed with the pressure medium displaced from the first stage and thereby from the pressure chamber 22 during lifting.
  • the hollow cylinder 20 contains at least one passage opening 25 for the pressure medium in its wall 24. Via this opening 25, the interior 26 of the hollow cylinder 20 is permanently connected to the pressure chamber 22.
  • a further piston 27 is slidably received, which is designed as a plunger.
  • the piston 27 can be extended from the telescopic cylinder 13 in the direction of the arrow 28, in the same way as the hollow cylinder 20 also in the direction of the arrow 29 and at the same time.
  • pressure medium e.g. Hydraulic oil
  • pressure medium introduced with pressure, which acts on the pressure chamber 21 facing surface of the disk piston 18, which is thereby pushed out together with the hollow cylinder 20 attached to it in the direction of arrow 29.
  • the disk piston 18 with its piston surface facing the other pressure chamber 22 displaces pressure medium contained in this pressure chamber 22, which is thereby pushed into the interior 26 through the at least one opening 25.
  • the piston 27 With the pressure medium forced into this pressure space 26, the piston 27 is acted upon with its facing effective piston surface, whereby the piston 27 is ejected in the direction of arrow 28.
  • This stroke movement of the second stage 20, 26 and 27 in the arrow direction 28 takes place synchronously with the stroke movement of the first stage 16-20 in the arrow direction 29.
  • the pressurization in the direction of the arrow 30 is ended and here instead switching to opposite ventilation.
  • the piston 27 is thereby pushed in the opposite direction to the arrow 28 into the pressure chamber 26, from which the pressure medium passes through the at least one opening 25 into the pressure chamber 22, where it acts on the piston surface of the disk piston 18 facing this pressure chamber 22 as a result, together with the hollow cylinder 20, is displaced downward in the opposite direction to the arrow 29 in FIG. 2 and, with its piston surface facing the pressure chamber 21, presses the pressure medium therein out of the outer cylinder tube 16 in the opposite direction to the arrow 30.
  • a plate 31 is fastened, which serves as an axial stop for this piston 27.
  • the second stage 20, 26 and 27 of the telescopic cylinder 13 is thus hydraulically connected to the first stage 16-22 and is forcibly coupled. This means that the lifting movement, which the disk piston 18 carries out with the hollow cylinder 20 attached to it, is also communicated to the second stage 20, 26 and 27 via this hydraulic coupling, as a result of which a synchronization between the first and the second stage is established.
  • the two telescopic cylinders 13 and 14 are coupled to one another via a mechanical synchronization control device 36, which has a transmission 37 and 38 for each telescopic cylinder 13, 14.
  • the respective gear 37 or 38 is assigned to the first stage of the respective telescopic cylinder.
  • the gear 37 of the telescopic cylinder 13 is designed as a rack and pinion gear.
  • This has a rack 39 which is attached to a telescopic part of the first stage.
  • the rack 39 is aligned parallel to the hollow cylinder 20 of the first stage and is fixedly connected to it at the upper end in FIG. 2 by means of a plate 40 there.
  • a pinion 41 is in gear engagement with the toothed rack 39 and is arranged on the other telescopic part of the first stage.
  • this pinion 41 is held on the spatially fixed outer cylinder tube 16, specifically there in a housing 42 which is connected to the upper flange 43 of the outer cylinder tube 16 in FIG. 2.
  • the synchronization control device 36 has a shaft 44 on which the pinion 41 of one telescopic cylinder 13 and, in an analogous manner, a corresponding pinion of the other telescopic cylinder 14 are arranged in a rotationally fixed manner. In this way, both gears 37, 36 are mechanically positively coupled.
  • a pressure switch 45 is provided in the first stage of each telescopic cylinder 13, 14, as indicated with reference to FIG. 2 for the telescopic cylinder 13, by means of which, when lowering, in the opposite direction to the arrows 28 and 29, which emerges from the pressure chamber 26 second stage can be detected via the opening 25 back into the pressure chamber 22 of the first stage pressure medium. Should it happen during this lowering movement that the plunger 27 is stuck in the hollow cylinder 20 instead of being lowered and gets stuck, so that no pressure medium is forced out of the pressure chamber 26 through the opening 25 and into the pressure chamber 22 via the plunger 27, this pressure drop in Pressure chamber 22 is detected by the pressure switch 45, whereupon the pressure switch 45 causes the lowering movement to be blocked hydraulically.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)
  • Types And Forms Of Lifts (AREA)
EP19890117332 1988-10-29 1989-09-20 Hydraulische Hubeinrichtung, insbesondere Zweisäulen- oder Mehrsäulen-Hebebühne Expired - Lifetime EP0372176B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883836903 DE3836903C1 (enrdf_load_stackoverflow) 1988-10-29 1988-10-29
DE3836903 1988-10-29

Publications (2)

Publication Number Publication Date
EP0372176A1 EP0372176A1 (de) 1990-06-13
EP0372176B1 true EP0372176B1 (de) 1992-09-09

Family

ID=6366165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890117332 Expired - Lifetime EP0372176B1 (de) 1988-10-29 1989-09-20 Hydraulische Hubeinrichtung, insbesondere Zweisäulen- oder Mehrsäulen-Hebebühne

Country Status (2)

Country Link
EP (1) EP0372176B1 (enrdf_load_stackoverflow)
DE (1) DE3836903C1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4018726A1 (de) * 1990-06-12 1992-01-02 Nussbaum Otto Gmbh Co Kg Hebebuehne fuer kraftfahrzeuge
DE29502958U1 (de) * 1995-02-22 1996-04-18 Meseck, Willi, 86444 Affing Brückenkran

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2616265A (en) * 1949-08-24 1952-11-04 Robert C Wilson Means for adjusting fluid motor elements to maintain synchronized movement
US2750004A (en) * 1952-04-09 1956-06-12 Dover Corp Combined load-equalizing and safety device for lifts
FR1403275A (fr) * 1964-07-09 1965-06-18 Schwermaschb Heinrich Rau Veb Dispositif hydraulique de synchronisation, applicable aux ponts et plates-formes de levage, et aux presses
DE2604256A1 (de) * 1976-02-04 1977-08-11 Walter Vogler Hebevorrichtung mit sicherheitsabstuetzung fuer fahrzeuge
DE2657831C3 (de) * 1976-12-21 1980-02-21 Algi Alfred Giehl Kg Maschinen- U. Hydraulikbau, 6228 Eltville Hydraulischer Teleskopkolbenantrieb für Hubvorrichtungen
DE2943370A1 (de) * 1979-10-26 1982-05-27 Otto Nußbaum GmbH & Co KG, 7640 Kehl Hydraulische hebebuehne
DE3235829A1 (de) * 1982-09-28 1984-03-29 Kirner Auto-Präzision Robert Fuchs GmbH & Co KG, 6570 Kirn Hebebuehne fuer fahrzeuge, insbesondere personenkraftwagen
DE8535184U1 (de) * 1985-12-14 1986-02-06 Maschinenfabrik J.A. Becker u. Söhne Neckarsulm GmbH & Co KG, 7107 Neckarsulm Hydraulische Hubeinrichtung, insbesondere Säulenhebebühne für Fahrzeuge

Also Published As

Publication number Publication date
DE3836903C1 (enrdf_load_stackoverflow) 1990-02-22
EP0372176A1 (de) 1990-06-13

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