ITBO930421A1 - "ELECTRO-HYDRAULIC LIFT DEVICE FOR VEHICLES" - Google Patents
"ELECTRO-HYDRAULIC LIFT DEVICE FOR VEHICLES" Download PDFInfo
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- ITBO930421A1 ITBO930421A1 IT000421A ITBO930421A ITBO930421A1 IT BO930421 A1 ITBO930421 A1 IT BO930421A1 IT 000421 A IT000421 A IT 000421A IT BO930421 A ITBO930421 A IT BO930421A IT BO930421 A1 ITBO930421 A1 IT BO930421A1
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- Prior art keywords
- cylinder
- fluid
- hydraulic
- main cylinder
- duct
- Prior art date
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- 239000012530 fluid Substances 0.000 claims abstract description 40
- 230000007547 defect Effects 0.000 claims description 2
- 230000003134 recirculating effect Effects 0.000 claims 2
- 238000004064 recycling Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- 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
- B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
- B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
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- 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
- B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
- B66F7/065—Scissor linkages, i.e. X-configuration
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- 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
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- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
Landscapes
- 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)
- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
, "DISPOSITIVO SOLLEVATORE ELETTROIDRAULICO PER AUTOVEICO-LI" , "ELECTRO-HYDRAULIC LIFTING DEVICE FOR MOTOR VEHICLES-LI"
DESCRIZIONE DESCRIPTION
La presente invenzione si inquadra nel settore tecnico concernente i dispositivi per il sollevamento degli autoveicoli . The present invention is part of the technical sector concerning the devices for lifting motor vehicles.
E' noto attualmente l'impiego di dispositivi elettroidraulici che consentono di sollevare?a una opportuna altezza gli autoveicoli, per rendere accessibile la loro parte inferiore. Sono noti in particolare dispositivi cosiddetti a forbice, predisposti per l'installazione a pavimento o incassata in opportune sedi. The use of electro-hydraulic devices is currently known which allow motor vehicles to be raised to a suitable height, in order to make their lower part accessible. In particular, so-called scissor devices are known, designed for installation on the floor or recessed in suitable seats.
Come illustrato a titolo esemplificativo in figg.la, lb e 2, i succitati dispositivi sollevatori prevedono in sostanza una coppia di pedane 1 orizzontalmente parallele, aventi lunghezza idonea a sostenere longitudinalmente il veicolo da sollevare: le pedane 1 sono montate su coppie di bielle 2 incernierate centralmente a forbice e azionate da rispettivi cilindri idraulici 3. As illustrated by way of example in Figures 1a, 1b and 2, the aforementioned lifting devices essentially provide a pair of horizontally parallel footrests 1, having a length suitable for longitudinally supporting the vehicle to be lifted: the footrests 1 are mounted on pairs of connecting rods 2 centrally hinged scissors and operated by respective hydraulic cylinders 3.
Qualora il dispositivo sollevatore sia montato a pavimento, sono previste rampe 4 di accesso alle pedane 1. Le pedane 1 sono inoltre dotate alle estremit? di arresti 5, 6 di sicurezza. If the lifting device is mounted on the floor, ramps 4 are provided for accessing the platforms 1. The platforms 1 are also equipped at the ends? of 5, 6 safety stops.
Nei dispositivi sollevatori succitati si pone il problema della sincronizzazione dei movimenti delle pedane, in -tutte le condizioni di utilizzo. Le pedane non sono infatti vincolate l?una all'altra, bens? montate indipendenti in maniera da rendere pienamente accessibile lo spazio intermedio. In the lifting devices mentioned above there is the problem of synchronizing the movements of the platforms, in all conditions of use. The platforms are not in fact bound to each other, but rather? mounted independently in order to make the intermediate space fully accessible.
A tal fine, le pedane sono azionate mediante una centralina idraulica atta a controllare la mandata e lo scarico del fluido idraulico ai rispettivi cilindri, come visibile nello schema di fig.3. Per maggiore chiarezza, in tale schema si sono indicati con Pi, P2 i cilindri idraulici, rispettivamente principale e comandato, delle due pedane, indicate a loro volta con la, lb, rispettivamente prima e seconda. To this end, the footrests are operated by means of a hydraulic control unit able to control the delivery and discharge of the hydraulic fluid to the respective cylinders, as shown in the diagram in fig. 3. For greater clarity, in this diagram the hydraulic cylinders, respectively main and controlled, of the two platforms, indicated in turn with la, 1b, respectively first and second, have been indicated with Pi, P2.
Il cilindro principale PI ? alimentato, tramite il condotto 7, dalla pompa 8 azionata dal motore 9; il condotto 7 presenta, a valle della pompa 8, una diramazione 10 per il ritorno del fluido idraulico al serbatoio 11, sulla quale sono previsti l?elettrovalvola di discesa 12 e la valvola di regolazione della portata 13. Il cilindro principale PI alimenta a sua volta, tramite il condotto 14, il cilindro condotto P2. I cilindri PI, P2 sono dotati di rispettive valvole di blocco 15. The main cylinder PI? fed, through the duct 7, by the pump 8 driven by the motor 9; the duct 7 has, downstream of the pump 8, a branch 10 for the return of the hydraulic fluid to the tank 11, on which the descent solenoid valve 12 and the flow rate adjustment valve 13 are provided. through the conduit 14, the driven cylinder P2. Cylinders PI, P2 are equipped with respective block valves 15.
L'azionamento del cilindro principale PI determina lo spostamento di una opportuna quantit? di fluido idraulico da questo al cilindro condotto P2, che in tal modo viene a sua volta azionato. E' da notare in particolare che il cilindro condotto P2 ha sezione ristretta rispetto al cilindro principale PI, pari alla sezione utile della camera dello stesso cilindro PI da cui riceve il fluido, tenendo conto cio? della presenza dello stelo in tale camera. In.tal modo la quantit? di fluido inviata al cilindro condotto P2 risulta teoricamente uguale a quella che alimenta il cilindro principale PI, in maniera da determinare uguali spostamenti delle due pedane . Il volume di fluido spostato dal cilindro principale PI al cilindro condotto P2 tom a al cilindro PI durante la fase di scarico, cio? all'abbassamento delle pedane. In tale fase il cilindro PI scarica invece nel serbatoio 11, grazie all'apertura dell'elettrovalvola 12. The actuation of the main cylinder PI determines the displacement of a suitable quantity? of hydraulic fluid from this to the driven cylinder P2, which in this way is in turn actuated. It should be noted in particular that the driven cylinder P2 has a narrow section with respect to the main cylinder PI, equal to the useful section of the chamber of the same cylinder PI from which it receives the fluid, taking into account that? the presence of the stem in this chamber. In this way the quantity? of fluid sent to the driven cylinder P2 is theoretically the same as that which feeds the main cylinder P1, so as to cause equal displacements of the two platforms. The volume of fluid moved from the main cylinder PI to the driven cylinder P2 tom a to the cylinder PI during the discharge phase, that is? when the platforms are lowered. In this phase the cylinder PI instead discharges into the tank 11, thanks to the opening of the solenoid valve 12.
Nella pratica tuttavia il movimento sincrono delle due pedane non ? sempre garantito, particolarmente a causa di possibili trafilamenti di fluido attraverso le guarnizioni dei pistoni dei succitati cilindri. Tali trafilamenti causano una variazione del volume di fluido spostato con conseguente perdita del sincronismo. Un aumento del volume di fluido inviato al cilindro P2 fa s?, ad esempio, che in fase di scarico il pistone di tale cilindro P2 non torni nella posizione di fine corsa prevista, determinando un mancato riallineamento a terra fra le pedane. In practice, however, the synchronous movement of the two platforms is not? always guaranteed, particularly due to possible fluid leaks through the piston seals of the aforementioned cylinders. These leaks cause a change in the volume of fluid displaced with consequent loss of synchronism. An increase in the volume of fluid sent to the cylinder P2 causes, for example, that during the discharge phase the piston of this cylinder P2 does not return to the foreseen end-of-stroke position, causing a lack of realignment on the ground between the footboards.
Una diminuzione del volume di fluido inviato al cilindro P2 ? causa di uno sfalsamento dell'altezza delle pedane, pi? precisamente Ila prima pedana la ? pi? alta della seconda pedana Ib. A decrease in the volume of fluid sent to cylinder P2? due to an offset of the height of the platforms, more? precisely the first platform there? pi? high of the second platform Ib.
Inoltre nella fase di spunto si produce usualmente un ritardo nell 'azionamento del cilindro condotto P2 rispetto al cilindro principale PI, dovuto alla comprimibilit? del fluido idraulico. Tale comprimibilit? fa s? che in un primo tratto di corsa del pistone del cilindro PI non corrisponda lo spostamento del fluido ma solo la sua compressione, e quindi non si abbia azionamento del cilindro P2. Furthermore, in the starting phase there is usually a delay in the actuation of the driven cylinder P2 with respect to the main cylinder PI, due to the compressibility? of hydraulic fluid. Such compressibility? does s? that in a first stroke portion of the piston of the cylinder P1 the displacement of the fluid does not correspond but only its compression, and therefore the cylinder P2 does not operate.
Il suddetto effetto di ritardo ? esaltato nella condizione di spunto dal fatto che ? questa la condizione di massima pressione a parit? di carico, nonch? dal fatto che i cilindri sono in posizione pressocch? orizzontale per cui il rapporto fra la corsa verticale delle pedane e la corsa dei pistoni assume il valore pi? elevato. The aforementioned delay effect? exalted in the condition of inspiration from the fact that? this is the condition of maximum pressure at parity? load, as well as? by the fact that the cylinders are in position almost? horizontal so the ratio between the vertical stroke of the footrests and the stroke of the pistons assumes the value pi? high.
In una ulteriore soluzione tecnica nota i due cilindri PI, P2 sono alimentati in maniera indipendente (ad esempio mediante una valvola di ripartizione di flusso) e il sincronismo tra le pedane la, lb ? imposto mediante un collegamento meccanico tra le bielle 2 (vedasi fig. la); si tratta di un accorgimento non ottimale a causa delle notevoli sollecitazioni meccaniche (prevalentemente di tipo torsionale) a cui sono assoggettati gli organi che -realizzano tale collegamento meccanico. In a further known technical solution, the two cylinders P1, P2 are fed independently (for example by means of a flow distribution valve) and the synchronism between the platforms la, lb? imposed by means of a mechanical connection between the connecting rods 2 (see fig. la); this is a non-optimal expedient due to the considerable mechanical stresses (mainly of the torsional type) to which the organs that make this mechanical connection are subjected.
Lo scopo della presente invenzione ? quello di realizzare un dispositivo sollevatore elettroidraulico che consenta di ottimizzare il movimento sincrono delle pedane, in particolare assicurando il riallineamento a terra al termine di ogni ciclo di lavoro e compensando l'azione di compressione del fluido idraulico allo spunto . The purpose of the present invention? that of realizing an electro-hydraulic lifting device that allows to optimize the synchronous movement of the platforms, in particular by ensuring the realignment to the ground at the end of each work cycle and compensating the compression action of the hydraulic fluid at the start.
Lo scopo citato viene ottenuto in accordo con quanto riportato nelle rivendicazioni. The cited object is achieved in accordance with what is reported in the claims.
Le caratteristiche dell'invenzione sono evidenziate nel seguito, con particolare riferimento alle unite tavole di disegno, nelle quali: The characteristics of the invention are highlighted below, with particular reference to the accompanying drawing tables, in which:
- le figg.la e lb illustrano una vista laterale schematica di un dispositivo sollevatore, rispettivamente nella posizione sollevata e nella posizione abbassata; Figures 1a and 1b show a schematic side view of a lifting device, respectively in the raised position and in the lowered position;
- la fig.2 illustra una corrispondente vista dall'alto di tale sollevatore; Fig. 2 shows a corresponding top view of this lifter;
- la fig.3 illustra uno schema di azionamento elettroidraulico del dispositivo sollevatore di tipo tradizionale ; - fig. 3 shows an electro-hydraulic actuation diagram of the traditional type lifting device;
- la fig.4 illustra uno schema di azionamento elettroidraulico del dispositivo sollevatore secondo la presente invenzione, nella fase di spunto; - Fig. 4 illustrates an electro-hydraulic actuation diagram of the lifting device according to the present invention, in the starting phase;
- le figg.5, 6 e 7 illustrano il medesimo schema di azionamento elettroidraulico, rispettivamente in una fase intermedia di sollevamento e di abbassamento e in fase di allineamento a terra. - Figs. 5, 6 and 7 show the same electro-hydraulic actuation diagram, respectively in an intermediate lifting and lowering phase and in the ground alignment phase.
Con riferimento alle suddette figure 4, 5, 6 e 7, la centralina idraulica 16 del dispositivo sollevatore in oggetto prevede un dispositivo di sincronizzazione 17 del movimento delle pedane la, lb. Tale dispositivo di sincronizzazione 17 ? dotato di una valvola 18, ad azionamento meccanico, posta su un condotto ausiliario 19 di mandata del fluido idraulico al cilindro condotto P2 che si dirama dal condotto 20 di alimentazione del cilindro PI. With reference to the aforementioned figures 4, 5, 6 and 7, the hydraulic power unit 16 of the lifting device in question provides a synchronization device 17 for the movement of the footboards la, lb. Such a synchronization device 17? equipped with a mechanically operated valve 18 placed on an auxiliary pipe 19 for delivering the hydraulic fluid to the driven cylinder P2 which branches off from the supply pipe 20 of the cylinder P1.
La valvola di sincronizzazione 18, del tipo a due vie, normalmente chiusa, ? comandata tramite un pressore 21 dal movimento della pedana lb. The synchronization valve 18, of the two-way type, normally closed,? controlled by a presser 21 by the movement of the platform lb.
Il condotto 19 ? collegato, a valle della valvola di sincronizzazione 18, al condotto 22 di ricircolo del fluido idraulico fra il cilindro principale PI e il cilindro condotto P2. Il condotto 22 ? dotato di un pressostato 23 ed ? altres? collegato al condotto di alimentazione 20 tramite un rubinetto 24, normalmente chiuso. Il funzionamento del dispositivo viene ora illustrato a partire dalla fase di spunto illustrata in fig.4. In tale fase, la valvola di sincronizzazione 18 ? aperta per azione della spinta esercitata dalla pedana lb sul pres-sore 21. Duct 19? connected, downstream of the synchronization valve 18, to the hydraulic fluid recirculation duct 22 between the main cylinder P1 and the driven cylinder P2. Duct 22? equipped with a pressure switch 23 and? also? connected to the supply duct 20 by means of a cock 24, normally closed. The operation of the device is now illustrated starting from the starting phase illustrated in fig. 4. In this phase, the synchronization valve 18? open by the action of the thrust exerted by the platform 1b on the pressure switch 21.
Pertanto il fluido idraulico alimentato dalla pompa 8 al cilindro principale PI tramite il condotto 20 viene deviato parzialmente al cilindro secondario P2, tramite il condotto ausiliario 19. In tal modo il ritardo nella mandata del fluido idraulico dal cilindro PI al cilindro P2 tramite il condotto di ricircolo 22, dovuto alla comprimibilit? del fluido stesso, viene compensato dal fluido alimentato direttamente al cilindro P2, assicurando il movimento pressoch? sincrono delle pedane la, lb. Therefore, the hydraulic fluid fed by the pump 8 to the main cylinder PI through the duct 20 is partially diverted to the secondary cylinder P2, through the auxiliary duct 19. In this way the delay in the delivery of the hydraulic fluid from the cylinder PI to the cylinder P2 via the recirculation 22, due to the compressibility? of the fluid itself, is compensated by the fluid fed directly to the cylinder P2, ensuring the movement almost? synchronous footpegs la, lb.
Il sollevamento della pedana lb determina successivamente la chiusura della valvola di sincronizzazione 18, sicch? a regime, in fase di sollevamento delle pedane, i condotti 20 e 22 non sono collegati e il cilindro condotto P2 viene alimentato soltanto con il fluido idraulico spostato dal cilindro principale PI nel condotto di ricircolo 22 (fig.5). The lifting of the platform 1b subsequently determines the closure of the synchronization valve 18, so that? at steady state, when the platforms are raised, the ducts 20 and 22 are not connected and the driven cylinder P2 is fed only with the hydraulic fluid moved by the main cylinder PI into the recirculation duct 22 (fig.5).
Analogamente in fase di discesa delle pedane, restando chiusa la valvola di sincronizzazione 18, il fluido alimentato al cilindro condotto P2 rifluisce al cilindro principale PI soltanto attraverso il condotto di ricircolo 22 (fig.6). Il fluido di azionamento del cilindro PI rifluisce invece nel serbatoio il attraverso il condotto 10, grazie all'apposita apertura della elettrovalvola 12. Similarly, during the descent of the platforms, with the synchronization valve 18 remaining closed, the fluid supplied to the driven cylinder P2 flows back to the main cylinder P1 only through the recirculation conduit 22 (Fig. 6). The operating fluid of the cylinder P1 instead flows back into the tank 11 through the duct 10, thanks to the special opening of the solenoid valve 12.
Al momento della discesa a terra, la pedana lb va ad aprire nuovamente la valvola di sincronizzazione 18, in maniera da consentire il deflusso del fluido idraulico dal cilindro P2 anche attraverso il condotto ausiliario 19 (fig.7). In .tal modo un eventuale eccesso di fluido nel cilindro P2, dovuto a possibili trafilamenti, viene scaricato direttamente nel serbatoio 11. Viceversa un eventuale difetto del fluido di sincronizzazione presente nel cilindro principale PI viene compensato deviando verso il condotto di ricircolo 22 una parte del fluido in scarico dal cilindro PI stesso. Upon descent to the ground, the platform 1b opens the synchronization valve 18 again, so as to allow the flow of the hydraulic fluid from the cylinder P2 also through the auxiliary duct 19 (fig. 7). In this way, any excess of fluid in the cylinder P2, due to possible leaks, is discharged directly into the tank 11. Conversely, any defect in the synchronization fluid present in the main cylinder PI is compensated by diverting a part of the fluid discharged from the PI cylinder itself.
In pratica la pedana lb mantiene aperta la valvola di sincronizzazione 18 fino a una corsa di sollevamento di circa 10 mm. In practice, the platform 1b keeps the synchronization valve 18 open up to a lifting stroke of approximately 10 mm.
Nel dispositivo sollevatore descritto viene pertanto risolto in maniera semplice ed efficace il problema del riallineamento a terra delle pedane, al termine di ogni ciclo, nonch? quello del mancato sincronismo in fase di spunto, dovuto alla comprimibilt? del fluido. In the lifting device described, therefore, the problem of realigning the platforms on the ground at the end of each cycle is solved in a simple and effective way, as well as the that of the lack of synchronism in the starting phase, due to the compressibility? of the fluid.
Si intende che quanto sopra ? stato descritto a titolo esemplificativo e non limitativo, per cui eventuali varianti costruttive si intendono rientranti nell'ambito protettivo della presente soluzione tecnica, come sopra descritta e nel seguito rivendicata. Do you mean the above? has been described by way of non-limiting example, so that any constructional variants are intended to fall within the protective scope of the present technical solution, as described above and claimed hereinafter.
Claims (2)
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT93BO000421A IT1264250B1 (en) | 1993-10-22 | 1993-10-22 | "ELECTRO-HYDRAULIC LIFT DEVICE FOR VEHICLES" |
| EP95900255A EP0724542B1 (en) | 1993-10-22 | 1994-10-19 | Electrohydraulic lifting device for motor vehicles |
| DE69410283T DE69410283T2 (en) | 1993-10-22 | 1994-10-19 | ELECTROHYDRAULIC LIFTING DEVICE FOR MOTOR VEHICLES |
| AT95900255T ATE166038T1 (en) | 1993-10-22 | 1994-10-19 | ELECTROHYDRAULIC LIFTING DEVICE FOR MOTOR VEHICLES |
| AU81146/94A AU8114694A (en) | 1993-10-22 | 1994-10-19 | Electrohydraulic lifting device for motor vehicles |
| DE0724542T DE724542T1 (en) | 1993-10-22 | 1994-10-19 | ELECTROHYDRAULIC LIFTING DEVICE FOR MOTOR VEHICLES |
| ES95900255T ES2116062T3 (en) | 1993-10-22 | 1994-10-19 | ELECTRO-HYDRAULIC LIFTING DEVICE FOR AUTOMOBILE VEHICLES. |
| PCT/IT1994/000176 WO1995011190A1 (en) | 1993-10-22 | 1994-10-19 | Electrohydraulic lifting device for motor vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT93BO000421A IT1264250B1 (en) | 1993-10-22 | 1993-10-22 | "ELECTRO-HYDRAULIC LIFT DEVICE FOR VEHICLES" |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| ITBO930421A0 ITBO930421A0 (en) | 1993-10-22 |
| ITBO930421A1 true ITBO930421A1 (en) | 1994-01-22 |
| IT1264250B1 IT1264250B1 (en) | 1996-09-23 |
Family
ID=11339278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT93BO000421A IT1264250B1 (en) | 1993-10-22 | 1993-10-22 | "ELECTRO-HYDRAULIC LIFT DEVICE FOR VEHICLES" |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0724542B1 (en) |
| AT (1) | ATE166038T1 (en) |
| AU (1) | AU8114694A (en) |
| DE (2) | DE724542T1 (en) |
| ES (1) | ES2116062T3 (en) |
| IT (1) | IT1264250B1 (en) |
| WO (1) | WO1995011190A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITVI980165A1 (en) * | 1998-09-07 | 2000-03-07 | Francesco Fiorese | HYDRAULIC CIRCUIT FOR THE OPERATION OF SERVICE BRIDGES FOR THE LIFTING OF VEHICLES |
| IT1302678B1 (en) * | 1998-10-15 | 2000-09-29 | Texo Srl | VOLUMETRIC DRIVE SYSTEM FOR VEHICLE LIFTING LINKS. |
| SE517223C2 (en) * | 2000-09-20 | 2002-05-14 | Morphic Technologies Ab | Hydraulic device for synchronizing at least two cooperating hydraulic pistons |
| CN1331725C (en) * | 2003-12-31 | 2007-08-15 | 深圳市汇银实业开发有限公司 | Swing type lifter for assembling four link torsional force axial type synchro |
| CN103407933B (en) * | 2012-09-03 | 2017-05-31 | 希实本株式会社 | Vehicle lifting with synchronizing function |
| CN102992224A (en) * | 2012-12-01 | 2013-03-27 | 江苏华宏科技股份有限公司 | Multi-hydraulic-cylinder electro-hydraulic synchronous lifting system |
| CN110219841B (en) * | 2019-06-14 | 2020-04-24 | 中国矿业大学(北京) | Instantaneous unloading hydraulic system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3476016A (en) * | 1967-10-20 | 1969-11-04 | Cascade Corp | Apparatus for producing coordinated,simultaneous actuation of multiple rams |
| DE3439292A1 (en) * | 1984-10-26 | 1986-05-07 | Otto Nußbaum GmbH & Co KG, 7640 Kehl | Hydraulically operated lifting device, especially lifting platform for motor vehicles |
| US5072649A (en) * | 1991-01-07 | 1991-12-17 | Laghi Aldo A | Double actuator with bypass lines for synchronized movement |
| NL9200686A (en) * | 1992-04-13 | 1993-11-01 | Stertil Bv | APPARATUS WITH SIMULTANEOUS HYDRAULIC JACKS. |
-
1993
- 1993-10-22 IT IT93BO000421A patent/IT1264250B1/en active IP Right Grant
-
1994
- 1994-10-19 AT AT95900255T patent/ATE166038T1/en not_active IP Right Cessation
- 1994-10-19 DE DE0724542T patent/DE724542T1/en active Pending
- 1994-10-19 WO PCT/IT1994/000176 patent/WO1995011190A1/en active IP Right Grant
- 1994-10-19 ES ES95900255T patent/ES2116062T3/en not_active Expired - Lifetime
- 1994-10-19 DE DE69410283T patent/DE69410283T2/en not_active Expired - Fee Related
- 1994-10-19 AU AU81146/94A patent/AU8114694A/en not_active Abandoned
- 1994-10-19 EP EP95900255A patent/EP0724542B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ITBO930421A0 (en) | 1993-10-22 |
| ES2116062T3 (en) | 1998-07-01 |
| DE69410283T2 (en) | 1998-10-01 |
| EP0724542B1 (en) | 1998-05-13 |
| EP0724542A1 (en) | 1996-08-07 |
| IT1264250B1 (en) | 1996-09-23 |
| WO1995011190A1 (en) | 1995-04-27 |
| DE724542T1 (en) | 1997-04-03 |
| DE69410283D1 (en) | 1998-06-18 |
| AU8114694A (en) | 1995-05-08 |
| ATE166038T1 (en) | 1998-05-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 0001 | Granted | ||
| TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19961031 |