FR2540050A1 - MOTOR VEHICLE HAVING A LOADING ELEVATOR PLATE - Google Patents

Abstract

This motor vehicle comprises a loading area 1 which, laterally, has an opening in which is installed a load lifting plate 4. On each side of this plate are arranged parallelogram connecting rods 6, 7 articulated on the one hand to the plate. elevator, on the other hand to beams forming a base 12 arranged outside the path followed by the platform between its high position and its low loading position. A hydraulic jack 24 actuates the assembly by attacking the connecting rods 6 arranged outside the beams 12 while the connecting rods 7 are arranged inside these beams relative to the lifting plate 4. (CF DRAWING IN BOPI)

Description

The present invention relates to a motor vehicle having a

  loading and of a lifting platform which constitutes a part of this area and which is attacked laterally by connecting rods of a parallelogram to move it up or down O

  Such lifting trays have, compared to

  yons lift, the advantage of a smaller footprint when loading and unloading they can 8 tro dispot

  both to learriare and laterally between

  with a 5 hicleq the lateral arrangement ensuring, in

  With regard to the lifting efforts generated, a

  more favorable partition of the load on the axles of the vehicle

  loading of the vehicle is attacked by connecting rods

  its laterally under this area and artieulées on the

  chassis of the vehicle or on a part associated with e chas-

  In general, these rods are operated by

a cylinder.

  The parallelogram connecting rods consist of two connecting rods on each side of the lifting plate and all connecting rods having the same effective length and distances

  the same value between their bearings c 8

  the chassis of the vehicle The points of arti

  therefore form on each side a parallelogram and

  allow the board to be raised or lowered

  horizontal position whatever the height where it is. Parallelogram rods can also be

  two-armed levers whose

  In this way, only one lifting and lowering device can attack the two connecting rods. The parallelogram connecting rods of the two plates of the plate can also be connected to one another by means of torsion bars or tubes, so that not only can they be mount as a finished assembly on a vehicle, but they only require for the ascent and descent a single device which -2-

  simultaneously attack all four rods.

  Also known by the patent application DE -A-

  2,243,360 a motor vehicle of the kind described in

  in which the bearings of the connecting rods

  logram of the c Sté of the chassis are arranged on a tube

  carrier extending over the width of the elevator platform.

  The latter requires, in order to be raised and lowered, ef-

  strong e onsidabls because of adverse leverage ratios; so it must remain relatively small,

  so that it can only receive cy-

  relatively small lindrical, the width of which is at most

  equal to one third of the width of 1 haulage area

  This is due to the fact that the effective length of the outer rods in relation to the middle of the loading area must always be greater than that of the engine. distance between the bearing of this connecting rod c 8 t -e elevator plateau and that of the edges

  longitudinal direction of this plateau which is turned towards the

vehicle.

  Such lifting trays are unsuitable for the loading and unloading of motor vehicles carrying standard pallets, two of which occupy the full width of the vehieule o These lifting platforms are even less able to raise and lower in addition a chaziot handling equipment for these pallets, which is however essential for loading or unloading.

  I 1 is further known from the patent application DE-

  A 2 253 805, not only to raise and lower a tray of the kind described in the preamble, but in

  when it is lowered, to tip it slightly

  in this loading position it is possible to drive on the platform without having to provide for it a particular loading ramp A such elevator platform simultaneously performs the upward movement -3 - or descent and tilting movement, so that even when the tray is halfway in height it already has a determined angle of inclination which, in case of shaking, can make a load on wheels moves in direction of the outer edge of the plateau and

  In addition, a plateau of this kind

  which has connecting rods having a relatively complex shape

  which ensure the progress of the geometric kinematics

  In addition, even with connecting rods of this kind, considerable leverage occurs, because during its rise or descent, the plate must

  pass the torsion tubes that connect the biel-

  the, so that lifting trays of relatively large dimensions, such as for raising or lowering with reasonable force and material a standard pallet and its forklift, can not be realized The rods have indeed, in the case most favorable, an inclination of 45, even when the tray is in the high position, so that the device that raises or lowers this tray must constantly, even during transport, exercise

considerable couples.

  In addition, in the case of the two lifting trays

  mentioned above, the connecting rods must be

  close to each other, so that if the

  water is non-uniformly loaded with the moments of

  high value can be generated.

  The problem to which the invention provides a solution

  then, for a motor vehicle of the kind described in

  written in the preamble, to create a lifting platform that has a considerably larger surface than that of known lifting platforms, which is capable in particular of raising and lowering standard pallets with their industrial truck, without requiring forces too much high, and which, while driving the vehicle, is fully available as a

  The solution to which the inven-

  has been distinguished by the fact that

  linkages opposed to the lift plate are

  tilted on bedstead beams extending

  parallel to the elevator platform and are, viewed from above, situated outside the trajectory of this plateau, while the inner connecting rods

  at the loading area are articulated on the

  behind the lift plate of these

bedstead beams.

  The bedstead beams according to the invention can

  to be fixed extremely simply and without

  dring high torque to the chassis of the vehicle

  make it possible to arrange the bearings of the connecting rods

  logrammed at a considerably greater distance than before, so that even large-area lifting trays can be built relatively lightly, even if they have to be subjected to unloaded loads.

  evenly distributed, because the four

  Parallelogram connecting rods define a

  comparatively large face The invention deviates so

  of the principle, until now usual, tubes of

  or carriers connecting the parallelogram rods

  both sides of the elevator platform, because now

  the latter is no longer supported by its

  on the loading side, but on both sides

  lateral ones that receive the parallelogram connecting rods.

  The slatted beams thus assume the function of the

  known carrier tubes; however, they are willing-

  at 900 compared to the position they had with the tubes, and they now get across

  from their longitudinal direction the rod bearings.

  To receive these bearings, these beams have a section

  rectangular, for example the section of a simple pro-

U-spun or square tube.

  In connection with the beams of sommier according to the in-

  vention, good lever arm ratios are obtained by the fact that the connecting rods located in the interior with respect to the loading area are articulated on the

  the inner side of the beams with respect to the

  in the upright position they occupy a substantially vertical position and can, without colliding with bearing parts of the plate or the vehicle, rotate about 1800 so that the plate takes up its low position. to use an ordinary chassis and equip it

  then the device according to the invention.

  Trays of this kind, the distance between inner and outer edges reported in the middle of the loading area is equal according to the invention to approximately half the width of the vehicle, allow to raise, lower and standard pallets and their industrial trucks without, as a result, a significant part of the

loading is sacrificed.

  Leverage ratios particularly

  vorable rod bearings located on the side of bed base beams are obtained when, according to the invention, the

  outer connecting rods to the loading area -

  are articulated to the outer sides with reference to the bed base beam and that the end

  of these connecting rods c 8 is the lifting plate is bent in di-

  of this plateau.

  the two bearings on the beam are located

almost compensated.

  When the inner connecting rods with respect to the loading area are, when the lifting plate is in the high position, bent towards the middle of the loading area, the bearings of the parallelogram and the parallel beam connecting rods can

  8 far away from each other, although some

  load-bearing parts of the vehicle chassis are

the parallelogram of the connecting rods.

  Leverage ratio particularly

  vorables are achieved when the effective length of

254005G

  outer connecting rods to the loading area -

  is less than the distance between the inner edge

  compared to the middle of the loading area of the

  lift and the bearings of these connecting rods on this

  In this case, the bearings on the beam are preferably arranged between the inner and outer edges of the raised plate; in particular, the center of gravity

  the raised plateau is located above the surface of the

  limited by the bearings on the box spring beams.

  A torsion tube which connects the bearings of the inner connecting rods with respect to the loading area on the beam side allows the use of a lifting and lowering device acting simultaneously on the two parallelogram rods, without thereby allowing freedom of movement. This is especially true when the bearings on the bed frame beams are very

  distant from each other, the distance

  The inside of the lift plate and the outer bearings c 8 tee plate is smaller than the distance between these bearings and those which, on the beams, correspond to them

diagonally.

  When the connecting rods consist of two-armed levers, whose arms opposite the lifting plate are articulated on a coupling rod thus forming another parallelogram and to transmit to both rods simultaneously the power of the mechanism which raises and lowers the plate, Kneepads are used according to the invention which, with reference to the plate in the high position, are bent towards the outer edge of the plate.

  up to 90 and ensures the freedom of movement

  required even when, during the ascent or descent of the plate, the rods of the latter must scan a relatively large angular range In connection with connecting rods arranged alternately on the beams of the bed base, the inner arms by 7- relative to the 'loading area opposite to the plateau are, on the outer sides of the box spring beams,

  each retained by means of a knee pin inserted into

duit by the corresponding beam.

  The beams of sommier are preferred

  by cantilevers extending laterally and parallel

  Similarly to the elevator platform below the loading area and having downwardly extending support arms terminating between the bearings of the box spring beams. In this way, the elevator platform can be attached to the vehicle by very simple means; in particular, a lifting platform to be installed on the longitudinal side of the loading area of a vehicle not yet equipped with such a plate does not require major transformations, because the cantilevers which

  usually exist across the load area-

  are appropriate, without any problem, to retain

  the beams of sommier On this subject, it reveals itself

  It is most favorable that the parallelogram connecting rods of the two sides of the elevator plate do not have to be held by torsion tubes as usual.

  so that the width of a lifting platform to be installed

  a posteriori on a vehicle can be adapted to the

  distance between two cantilevers.

  The support arms can be attached to these cantilevers by welding, bolting, etc.

  A tilting of the elevator platform so that it

  cupe a low loading position in slight decli-

  to the outside is obtained by the fact that each bedstead beam has a retaining point forming

  bearing with an axis extending parallel to the outer edge

  In this way the beam can tilt in an angular range delimited by

  In this arrangement, the ascent and descent

  the tray in a horizontal position are ensured by

  the fact that a mechanism for raising and lowering the

  It acts on the outer connecting rods with respect to the loading area. Preferably, each carrying arm comprises, besides the bearing of the holding point, an abutment

  upper for the corresponding bed beam.

  This abutment is disposed on the side of the holding point which, when the plate is in the down position, must be directed downwards and is therefore turned towards the connecting rod attacked by the up and down mechanism.

  this way the rise and the descent of the

  always fall, under the effect of its own weight, in a substantially horizontal position The tilting in the low position of the plate begins independently of the effective height of the plate each time its lower face meets a resistance arranged, with respect to the center of gravity of the tray, the side facing the middle of the loading area This resistance may be constituted for example by a portion in relief on the underside of the tray, in particular in the form of a roller. The raising and lowering of the elevator platform according to the invention is preferably carried out by means of

  two hydraulic cylinders; in their place one can also pre-

  see cable pulls or chains The two

  hydraulic cylinders can be ordered from

only one valve.

  Finally, it is also possible, according to the invention, to design the plate and the connecting rods of parallelogram

  so that the upper face of the tray in po-

  In this case, the plateau can be surrounded by a corresponding height frame on the upper level of the loading area by a certain distance, for example equal to the height of a standard pallet.

  the edges of the opening in the load area-

  to receive the lift plate In this case, the

  tray can be lifted up to a standard pallet

  This has the advantage that with standard pallets

  can, with the help of a devil, bring

  individual cases, eg crates of bottles, -9-

  at the same level as the lift plate, to be de-

  loaded with the vehicle The lift plate according to the

  vention is therefore usable for handling

  pallets as individual packages.

  Another advantage of the lifting platform according to the

  the fact that in the provision

  up to now, from a lifting platform to the

  riire of a truck, it is necessary, before being able to unload the pallets placed at the front of the vehicle, to unload all those which are at the back This is all the more embarrassing that in particular in the transport of

  bottled drinks it is almost always necessary to

  manage partial batches and take up the same quantity of empty pallets of pallets

  according to the invention, the inconvenient and overworked

  long to perform are almost entirely removed,

  because of the layout of this plateau almost half

  instead of the loading area the pallets placed at the front are accessible as well as those placed at

the rear.

  The invention is described in more detail below at

  using an example of execution illustrated in the drawing

  nexed; FIG. 1 is an elevational view of a portion of the rear of a motor vehicle equipped with a side elevator platform, FIG. 2 is a view similar to FIG. 1, but showing the elevator platform. in the low position, FIG. 3 is a plan view of the vehicle equipped with the lift plate in the intermediate position,

  Figure 4 is a diagram of the charging area-

  vehicle equipped with a lifting platform in

  high position and in the low position, and FIG. 5 is a view on a larger scale of the

  mounting of the hydraulic cylinder according to fig 1.

  A motor vehicle having a loading area 1 comprises a support frame composed of longitudinal members 2 on which lie across the cantilevers 3 This area 1 comprises a lateral opening occupied by a lifting plate 4 The parallelogram rods 6, 7 attack the plate 4 through bearings 8, 9 arranged on two sides of the plate The bearings 10, II of the rods 6, 7 remote from the plate 4 are arranged

  on two beams 12 forming a bed base extending laterally

  parallel to the plate 4 and located, seen from

  high, laterally off the board 4.

  Each of the two bed base beams 12 comprises,

  between the bearings 10, 11, a 13-component retention point

  killing another bearing at the lower end of a carrying arm 14, the two carrying arms 14 are each fixed below the cantilevers 3 which extend from each

  side of the plate 4, their fixation being such that it allows

  places the unhindered tilting of the inner rods 7 with respect to the loading area 1, arranged on the inner side with respect to the plate 4 of the bedstead beams 12 By cons, the rods 6, external to the loading area 1, are articulated on the other side of the beams 12 and, at their end c 8 t plateau, they are bent (Figure 3) so that

  they can move freely between the side edges

  the shelf and the cantilevers 3 which maintain

  the carrying arms 14 The distance between the inner edges

  15-outer and 16 outside (relative to the middle of the loading area) of the plate 4 is substantially equal to the half width of the vehicle relative to the position of

  transport of the plate 4 (FIG. 1), the connecting rods 7 of this

  the inner side with respect to area 1, are bent twice around the spar 2 in the direction of the

middle of the said area.

  The effective length of the rods 6, external to the area 1, is less than the distance between the inner edge 15 of the plate 4 and the bearings 8 of these rods on this plate; this distance is at his

  at least when the parallelogram is in position

11 -

  deployed less than the distance between the

  8 and 11 diagonally opposite each other, so

  that the connecting rods 7 can, at their bearings 11, be

  united by a torsion tube 17 (FIG. 3) The bearings S 10 and 11 on the bed frame beams 12 are located between

  the projection lines of the inner edges 15, and outer

  16 of the plateau 4 in the high position whose center

  of gravity is then above the surface de-

  limited by the bearings 10 and 11 of the two beams 12.

  The rods 6 and 7 form kneepads with two arms, the arms 19 and 20 opposite the plate 4 are cranked towards the outer edge 16 of this plate

  in the upper position and are connected to each other

  articulated by a coupling rod 21,

  thus another parallelogram 22 The arm 20 of

  the inner rod 7 is disposed on a knee axis

  lère 23 (FIG. 3) which passes through the bed beam 12 and

  is retained in the bearing Il without possibility of turning.

  In this way, the pushing or pulling force exerted by a hydraulic jack 24 acting between the cantilever 3 and the outer rod 6 on the latter

  at the same time acts on the rod 7 and possibly also

  if, via the torsion tube 17, on the

  two opposite connecting rods of the lifting plate 4.

  The piston rods of the hydraulic cylinders are mounted in a pendulum manner as shown in FIG. 5, to ensure a sufficient stroke length. This is why the end of these rods is fixed to one of the wings of an angle iron 29 of which the other wing is attached to

  the connecting rod 6 via a journal 30.

  From its upper position (FIG. 1), the plate is brought to its lower position either by its own weight or assisted by two double-acting hydraulic cylinders. During this descent, the traction that is exerted on the two outer bearings 10 bedstead beams 12 by the own weight of the tray and that

  the burden it bears and which is passed on to

12 2540050

  -12 - levers 3 by the outer rods 6 as well as by the '

  jacks 24 keeps the beams 12 in their respective position.

  It is connected to the loading area 1 by a stop 25 of the support arm 14, since the traction exerts on these beams a torque of rotation directed upwards around the bearing 13 at the point of retention of these beams located at

  the interior with respect to the abutment 25.

  The outer edge 16 of the plate 4 describes during its descent an arc of a circle whose radius is equal to the

  effective length of connecting rods 6 and 7,

  that relatively relatively erected rods in the transport position of the elevator platform lead to an offset of the outer edge 16 greater than with

rods less strongly erect.

  The maximum offset of the outer edge 16 of the plate, shown in dashed lines in FIG. 2, is reached in this

  execution example when the plate occupies its posi-

  medium in which the connecting rods of the parallelo-

  gram 5 are in the extended position This d-eport decreases again when the platter continues its descent In the loading position of the platen illustrated in FIG. 2 the residual offset beyond the edge of the vehicle is for example only -35 cm; it can however be further diminished, the only condition to be observed being that the jack

  24 and the outer rods 6 always form a certain

  angle between them so that even in the lowest position of the plateau they are not in the pro

along the cylinder.

  During its descent, the plateau remains parallel to the loading area 1 until an enrelief

  on its underside, for example rollers 26, all

  soil, so that, as the plateau continues to descend, it tilts towards the outer edge.

  protect the bearings 8 and 9 of the connecting rods 6 and 7

  arranged under the tray 4, it is recommended to

  arrange rollers 26 and smaller rollers 27 also

  as close as possible to the edge of this plateau.

* 13 - During the rise of the plate, the traction exerted on the outer rods 6 operates first of all a horizontal setting of the plate, during which

  the bedstead beams 12 swing to become parallel

  to the loading area until they meet

  counteract the stop 25 The continuous traction of S 'exert

  on the outer rods 6, the plate 4 rises

  then parallel to the said area.

  A lift tray thus / allows loading and unloading also in any position between

  extreme positions illustrated in fig O 1 and 2

  water can also be designed in such a way that

  transport position it exceeds 15 cm above 1 '

  loading area 1, so that normal pallets

  on the loading area can be serviced at the same level by a devil. In this case, the opening in the area 1 is surrounded by a

  corresponding height frame.

  In FIG. 3, the plate 4 is shown in plan and with its maximum offset. The box beams 12 are exactly below the 3-point; we do not see them, except from the left side on the drawing

  o The loading area and the cantilever have been erased

  The coupling rods 21 were, for clarity and contrary to what is shown in FIGS. 1 and 2, disposed outwardly with respect to the beams 12, but this is not essential, already

  because the cranking of the knee pads 6 and 7 is just-

  contigated so that the rods of the parallelogram 22

  can not in any case be superimposed.

  It can be seen from Fig. 4 that a truck equipped with

  The elevator according to the invention can carry eleven standard pallets and it is possible by means of this platform to load whole pallets including a pallet.

  trolley 28 Thanks to the arrangement

  from the plateau in relation to the loading area,

  pallets (F, G, I, K) are selectively accessible when

  this area is fully occupied.

  rets represents the tray in the lowered position.

14 -

Claims (14)

REVENDI CATIONS   1 Motor-vehicle having a loading area (1) and a lifting platform (4) which constitutes a part of this area and which is laterally attacked by connecting rods of a parallelogram (5) to make it go up or down, remarkable N ewhere the bearings (10, 11) of the connecting rods (6, 7) opposite to the lifting plate (4) are articulated on beams forming a bed base (12) which extend laterally and parallel to the plate   elevator and are, viewed from above, located outside the   of this tray, while the inner connecting rods (7) with respect to the loading area (1) are hinged   on the inner faces, with respect to the elevated tors, slatted beams (12).   Vehicle according to claim 1, remarkable in   the distance between the outer edges (16) and   (15) in the middle of the loading area -   is substantially equal to half the width of the vehicle cule.   Vehicle according to claim 1 or 2, noted   in that the outer rods (6), in relation to   the loading area (1) are articulated to the outer   with reference to the elevator platform (4) of the bed frame beams (12), the end of these connecting rods being bent towards the latter from the side of the elevator plate.   Vehicle according to any one of the claims   previous, remarkable in that the inner rods (7) relative to the loading area (1) are, when the elevator plate (4) is in the up position,   bent towards the middle of the said area.   Vehicle according to any one of the claims   previous, remarkable in that the effective length of the outer rods (6) relative to the loading area (1) is less than the distance between their bearings (8) on the plate (4) and the inner edge (15). ) of this plateau. -   Vehicle according to any one of the claims   tions, remarkable in that the bearings   (10, 11) on the bed frame beams (12) are   between the inner (15) and outer (16) edges of the elevator platform (4) when it is in position. raised.   Vehicle according to any one of the claims   previous developments, remarkable in that the center of   gravity (18) of the lift plate (4) in the re-   raised is situated above the plane defined by the   bearings (10, 11) on the bed base beams (12).   Vehicle according to any one of the claims   tions, remarkable in that the bearings   (11) by which the inner connecting rods (7) with   port to the loading area (1) are hinged to the bed frame beams (12) are interconnected by a torsion tube.   Vehicle according to any one of the claims   previous, remarkable in that the rods (6, 7) form crank levers (knee) whose arms (19, 20) opposite the elevator plate (4) are, with reference to this plate in the raised position, bent in direction of the outer edge (16) of this plate, the free ends of these levers being articulated to connecting rods (21) forming each time   another parallelogram (22) with the connecting rods (21).   Vehicle according to claim 9, remarkable   in that with connecting rods (6, 7) arranged alternately   on the bed base beams (12), the arms (20)   - relative to the loading area (1) -   opposed to the elevator plate (4) are retained on the outer side of said beams by means of an axis of   toggle joint (23) passing through the corresponding beam.   Vehicle according to any one of the claims   previous arrangements, in that the bed frame beams (12) are supported by cantilevers (3) which extend laterally and parallel to the elevator platform (4) below the loading area (1) and which comprise supporting arms (14) directed downwards terminating between the bearings (10, 11) of the bed frame beams (12).   Vehicle according to any one of the claims   tions, remarkable in that each beam   of the bed base (12) has a holding point (25)   bearing mantle (13) with parallel axis   at the outer edge (16) of the elevator platform (4).   Vehicle according to claim 12, characterized in that a raising and lowering mechanism (24) acts on the outer rods (6).   Vehicle according to any one of the claims   previous events, remarkable in that each   (13) of the bed beam (12) has a buil-   upper tee (25) for this beam.   Vehicle according to any one of the claims   previous, remarkable in that the elevator plate (4) has on its underside at least one raised portion (26) located on the side of the center of gravity of this plate which is turned towards the middle of the loading area (1).   Vehicle according to any one of the claims   tions, remarkable in that the upper surface   upper platform (4) in the upper position is   higher than the loading area (1).   17 Vehicle according to any one of the claims   previous events, remarkable in that the rods of   piston of the hydraulic cylinders (24) are mounted dully -