EP0957062A2 - Plate-forme de levage pour véhicules avec une tringlerie pour réduire l' effort de levage au début du déploiement - Google Patents
Plate-forme de levage pour véhicules avec une tringlerie pour réduire l' effort de levage au début du déploiement Download PDFInfo
- Publication number
- EP0957062A2 EP0957062A2 EP99109616A EP99109616A EP0957062A2 EP 0957062 A2 EP0957062 A2 EP 0957062A2 EP 99109616 A EP99109616 A EP 99109616A EP 99109616 A EP99109616 A EP 99109616A EP 0957062 A2 EP0957062 A2 EP 0957062A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- linkage
- lever
- ramps
- linkage element
- carriage
- 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
Links
Images
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
- B66F7/06—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
- B66F7/0666—Multiple scissor linkages vertically arranged
-
- 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
Definitions
- the present invention relates to a linkage with reduced starting load for moving the ramps of compact auto lifts for motor vehicles.
- Said auto lifts can, according to requirements, be installed either so as to fully retract into adapted pits provided in the floor surface or so as to lay flat directly thereon.
- said cylinders are in fact arranged so that when the ramps are fully lowered the cylinders lie practically horizontally.
- prior art includes several provisions which allow, by using the small clearance between the floor surface and the floor pan of the vehicle, to make one end of the cylinders travel for a first extent, equal to the clearance, by rotating on a vertical plane which substantially coincides with the axis of said cylinders, so that they are substantially not loaded along said extent and so that at the same time the rotation of one end causes the eccentricity that is necessary to provide a lever arm which then allows to generate a lifting moment sufficient to overcome the total load.
- crank systems which, being variously articulated to each other, dynamically move the fulcrum points at the beginning of the expansion stroke of the cylinders that move the ramps.
- crank systems are complicated to provide in practice, since they are composed of a considerable number of levers and joints, all of which must accordingly be sized adequately to overcome the loads and, most of all, must be able to be accommodated, folded and retracted, when the ramps are lowered completely.
- the aim of the present invention is to solve the above problem of the prior art by providing a linkage with reduced starting load for moving the ramps of compact auto lifts which is simple to provide, safe in operation, and substantially compact with respect to conventional ones.
- a linkage with reduced starting load for moving the ramps of compact auto lifts characterized in that it comprises a base carriage which can slide at floor level on a corresponding footing and has a preset horizontal stroke, an end of a fluid-actuated actuator and a contiguous end of a linkage element being respectively coarticulated to said carriage, the length of said actuator being axially variable, said linkage element having eccentric means for the partial rotation of said linkage element on a vertical plane, the opposite end of said linkage element being in turn slidingly articulated in a hinge-like manner, by way of corresponding articulation means, to the body of a lever for lifting the corresponding ramp by contact, the opposite end of said actuator being articulated to a rod-like member which composes a pantograph structure for lifting said ramps.
- the reference numeral 1 schematically designates one of the ramps of an auto lift.
- a corresponding linkage 3 for moving the ramps 1 with a reduced starting load is mounted in parallel to each lattice.
- the linkage 3 essentially comprises a base carriage 4 which can slide at floor level on a footing 5 which usually coincides with the footing of the corresponding lattice frame and has a preset horizontal stroke.
- a fluid-actuated actuator with axially variable length constituted by a cylinder 6 in the specific case, and a contiguous end of a linkage element 7 provided with eccentric means adapted to produce a partial rotation thereof in a vertical plane, are respectively coarticulated to the carriage 4.
- the opposite end of the linkage element 7 is in turn slidingly articulated by means of a hinge 7a, with corresponding articulation means 9, to the body of a lever 10 for lifting the corresponding ramp 1 by contact.
- the opposite end of the cylinder 6 is articulated in 6a to one of the rod-like members 2 that composes, as mentioned, the usual pantograph-like structure.
- the eccentric means 8 are constituted by a concave portion 8a with a circular arc-like profile which blends with a straight portion formed in the lower median portion of the linkage 7; the concave portion 8a is adapted to slide and mate, by resting, with a corresponding wing 11 that protrudes upward from the footing 5 and has, in an upward region, a adapted convex profile 11a which is complementary to the concave portion 8a; the base of the lever 10 is also articulated to the wing.
- the articulation means 9 are constituted by the hinge 7a, which is slidingly guided in a corresponding slot 12 having a preset length and provided in the lever 10.
- the slot 12 is arranged diagonally with respect to the longitudinal axis of the lever 10 in which it is formed, and its end that lies distally with respect to the base of said lever 10 is directed upward.
- the cylinders 6 When movement begins, the cylinders 6 begin their extension step and gradually move the carriages 4 in the guides 4a that control their overall stroke.
- the levers are in contact, through their upper ends, with the lower faces of the ramps 1 and transmit thereto the gradual lifting induced by the linkage elements 7.
- the carriages 4 reach the maximum extent of their stroke and the articulation points of the upper ends of the cylinders 6 gradually rise, generating the necessary lever arms, designated by B in Figure 4, which allow, thanks to a subsequent further extension of the cylinders 6, to applying the lifting moment that is required to easily move upward the ramps 1 loaded with a motor vehicle.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Vehicle Step Arrangements And Article Storage (AREA)
- Linear Motors (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
- Motorcycle And Bicycle Frame (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1998MO000104 IT1304631B1 (it) | 1998-05-14 | 1998-05-14 | Biellismo di movimentazione a spunto agevolato delle corsie di pontisollevatori a basso ingombro per autoveicoli |
ITMO980104 | 1998-05-14 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0957062A2 true EP0957062A2 (fr) | 1999-11-17 |
EP0957062A3 EP0957062A3 (fr) | 2001-03-21 |
EP0957062B1 EP0957062B1 (fr) | 2004-07-28 |
Family
ID=11386644
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99109616A Expired - Lifetime EP0957062B1 (fr) | 1998-05-14 | 1999-05-14 | Plate-forme de levage pour véhicules avec une tringlerie pour réduire l' effort de levage au début du déploiement |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0957062B1 (fr) |
DE (1) | DE69918896T2 (fr) |
IT (1) | IT1304631B1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2533980A (en) * | 1946-01-04 | 1950-12-12 | Weaver Engineering Co | Lifting and lowering appliance |
US2937852A (en) * | 1956-10-29 | 1960-05-24 | Jesse E Clarke | Lift device |
EP0286615A1 (fr) * | 1987-04-10 | 1988-10-12 | Toivo Mäkelä | Cric articulé |
EP0372246A1 (fr) * | 1988-12-06 | 1990-06-13 | Jlg Industries, Inc. | Appareil de levage d'une plate-forme |
-
1998
- 1998-05-14 IT IT1998MO000104 patent/IT1304631B1/it active
-
1999
- 1999-05-14 DE DE69918896T patent/DE69918896T2/de not_active Expired - Fee Related
- 1999-05-14 EP EP99109616A patent/EP0957062B1/fr not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2533980A (en) * | 1946-01-04 | 1950-12-12 | Weaver Engineering Co | Lifting and lowering appliance |
US2937852A (en) * | 1956-10-29 | 1960-05-24 | Jesse E Clarke | Lift device |
EP0286615A1 (fr) * | 1987-04-10 | 1988-10-12 | Toivo Mäkelä | Cric articulé |
EP0372246A1 (fr) * | 1988-12-06 | 1990-06-13 | Jlg Industries, Inc. | Appareil de levage d'une plate-forme |
Also Published As
Publication number | Publication date |
---|---|
ITMO980104A1 (it) | 1999-11-14 |
EP0957062B1 (fr) | 2004-07-28 |
DE69918896T2 (de) | 2004-12-16 |
DE69918896D1 (de) | 2004-09-02 |
EP0957062A3 (fr) | 2001-03-21 |
IT1304631B1 (it) | 2001-03-28 |
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