WO2016170251A1 - Assemblage de bras de ciseaux pour mecanisme de levage en ciseaux d'une nacelle elevatrice - Google Patents
Assemblage de bras de ciseaux pour mecanisme de levage en ciseaux d'une nacelle elevatrice Download PDFInfo
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- WO2016170251A1 WO2016170251A1 PCT/FR2016/050879 FR2016050879W WO2016170251A1 WO 2016170251 A1 WO2016170251 A1 WO 2016170251A1 FR 2016050879 W FR2016050879 W FR 2016050879W WO 2016170251 A1 WO2016170251 A1 WO 2016170251A1
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- Prior art keywords
- axis
- arm
- scissor
- arms
- assembly according
- Prior art date
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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
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/042—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations actuated by lazy-tongs mechanisms or articulated levers
-
- 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
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/22—Lazy-tongs mechanisms
-
- 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
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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
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/12—Platforms; Forks; Other load supporting or gripping members
- B66F9/127—Working platforms
Definitions
- the present invention relates to the field of mobile elevating work platforms (also referred to as PEMP) still commonly referred to as aerial work platforms. It relates more particularly to scissor lifts.
- PEMP mobile elevating work platforms
- aerial work platforms still commonly referred to as aerial work platforms. It relates more particularly to scissor lifts.
- Scissor lifts are machines designed to allow one or more people to work at height. They include a frame, a work platform and a lifting mechanism of the work platform.
- the chassis is mounted on wheels to allow movement of the aerial platform to the ground.
- the work platform includes a tray surrounded by a railing. It is intended to accommodate one or more people and possibly also loads such as tools or other material, materials such as paint, cement, etc.
- the working platform is supported by the lifting mechanism which is mounted on the chassis.
- the lifting mechanism lifts the work platform from a lowered position on the frame to the desired working height, usually by means of one or more hydraulic cylinders. Depending on the models concerned, the maximum working height generally varies between 6 and 18 meters.
- FIGS. 1 and 2 illustrate such a lifting platform of the prior art which is marketed by the applicant in its range called Optimum: the chassis is referenced 1, the scissor lift mechanism 2, the work platform 3, the hydraulic actuating cylinder of the lifting mechanism of the working platform 4.
- the scissor lift mechanism comprises pairs of tubular beams hinged together at their center like scissors, a plurality of such scissors being mounted above each other others by their articulated ends: cf. the four pairs (21, 22), (23, 24), (25, 26) and (27, 28). These four pairs of stacked scissors constitute a first set of stacked scissors. As is the most common case, the scissor mechanism comprises a second set of stacked scissors which is identical to the first set and parallel thereto while being offset laterally with respect to the first: cf. the four pairs (31, 32), (33, 34), (35, 36) and (37, 38). The use of two sets of parallel scissors ensures the horizontal stability of the work platform.
- the lifting mechanism 2 comprises 4 stages of scissors indicated by the references 11 to 14, but there may be more or less.
- Scissor beams are also commonly referred to as scissor arms.
- the hydraulic cylinder 4 is mounted at both ends to the sets of scissors, each to another stage of scissors. In this way, the cylinder can open and close the scissors to raise and lower the work platform.
- one of the ends of the hydraulic cylinder 4 is mounted on the chassis of the aerial platform.
- the lower ends of two homologous beams of the first stage 11 are pivotally mounted on the frame 1 by an axis 15 while the lower ends of the two other homologous beams of the same stage are traversed by an axis 16 which is slidably mounted on the frame 1.
- the upper ends of two homologous beams of the last stage 14 are pivotally mounted under the working platform 3 by an axis 17 while the lower ends of the other two beams counterparts of the same floor are traversed by an axis 18 which is slidably mounted under the working platform 3.
- the inner beams of the same scissor stage are rigidly interconnected by spacers so as to form a one-piece assembly.
- Figure 4 illustrates the case of the inner beams 24 and 34 of the second scissors stage 12 which are interconnected by a respective spacer 40, 41 at each end.
- a third spacer connecting the inner beams is arranged at their center for the other scissor stages 11, 13 and 14, because it does not interfere with the cylinder 4.
- these spacers are mounted in holes in the internal beams. More specifically, the spacers pass through the inner beams and are welded to each side of the inner beams.
- these spacers have a cylindrical section and serve as a mounting housing at each end for a respective pivot axis 42, 43 for the corresponding inner and outer arms 24, 25 and 34, 35.
- the pivot axes 42, 43 are blocked in the spacer by a respective bolt 44, 45.
- the outer beams 25, 35 each comprise a through hole in which is housed a bushing 50, respectively 51.
- the bushes 50, 51 are welded on each side to the outer beam corresponding 25, respectively 35.
- the bushings 50, 51 define the mounting housing pivot axes 42, 43 respectively.
- the bushes 50, 51 are each provided with a plain bearing ring 52, 53 respectively.
- a respective elastic ring 54, 55 blocks the sliding of the outer arms 25, 25 on the corresponding pivot axis 42, 43.
- the connecting struts of the inner beams of the scissor lift mechanism do not receive the pivot axes of the inner and outer beams.
- the spacers are welded to the inner beams at a location offset from the pivot axis of the beams. The latter are each received in the internal beams by means of a socket fixed in a passage hole similarly to the case of the outer arms.
- the weld seams at the boss of the sleeves or spacers passing through the beams can be the seat of significant stress concentrations that limit their fatigue life. Therefore, it is generally necessary to resume, once the welding operations have been completed, the bores of the bushings welded in the beams and, where appropriate, those of the spacers welded in the inner beams at their two ends serving to accommodate the pins. pivoting in order to control the level of mechanical stresses in the axes and in the weld seams of the sleeves and spacers on the beams. In the case of spacers, the machining is even more complicated because of the size of the one-piece assembly constituted by the inner beams connected together.
- US 2008/0105498 A1 proposes to replace the welding by a plastic deformation operation of the ends of the sleeve after mounting in the passage hole of the beam to keep it in place in the beam.
- This solution can pose difficulties in terms of the precision of the parts.
- it requires placing a spacer in the beam through which the sleeve is received, which makes more complex the manufacture of the scissor beam.
- the object of the present invention is to at least partially overcome the aforementioned drawbacks.
- a scissor arm assembly for a scissor lift mechanism of the work platform of an aerial work platform, comprising a first scissor arm and a second scissor arm. scissors mounted together pivotably about an axis traversing the two arms, wherein:
- each of the arms is formed by a tubular beam which presents:
- a second local reinforcing plate welded to the outer surface of a second side of the beam which is opposite the first side of the beam;
- the axis is supported circumferentially in the first through hole by both the beam and the first reinforcing plate;
- the axis is supported circumferentially in the second through hole both by the beam and the second reinforcing plate; and o the axis is free of support inside the beam between the first through hole and the second through hole.
- pivot axis it is indeed unnecessary for the pivot axis to be supported over the entire width of the scissor beam as is generally the case in the prior art. It will be understood that those skilled in the art will dimension the reinforcing plates, in particular their thickness, so that the width of the through holes is appropriate to properly support the pivot axis which is received with respect to the mechanical stresses. to which they will be subjected within the aerial platform.
- the shape and size of the reinforcing plates are not directly imposed by those of the pivot axis or a part receiving the axis as is the case of the sleeve or spacer in the Prior art, these may be chosen by those skilled in the art so as to limit the stress concentrations in the weld bead that binds them to the beams to improve its fatigue life.
- the length of the weld bead - which is determined by the perimeter of the reinforcing plates - may advantageously be chosen greater than that of the weld bead usually applied at the boss of the sleeves or spacers passing through the beam. in the case of the prior art.
- the solution of the invention allows the use of a tubular beam without having to weaken with openings.
- the two holes for passage of the axis can advantageously be made - or finished in case of pre-drilling - after the welding operation of the reinforcing plates. In this way, the possible deformations of the beam due to welding will not influence the positioning of the through holes. Furthermore, the machining operations of the through holes are minimized because the cumulative depth of the two axis passage holes is less than the width of the scissor beam unlike the case of bushings or spacers in the prior art.
- the assembly of the scissor arms according to the invention can also be used for single scissor lifts, that is to say which comprise only one set of stacked scissors.
- the scissor arm assembly according to this first aspect of the invention comprises one or more of the following features:
- the axis is locked in translation relative to the two arms
- a respective smooth bearing ring is arranged in the first through hole and in the second through hole of the second arm;
- a stop member is removably attached to the first arm and interferes with the axis by shape cooperation to stop translation of the shaft relative to the first arm;
- the stop member interferes with the axis by shape cooperation to lock the axis also in rotation relative to the first arm;
- the axis has at least one groove engaged by the stop element to block the axis both in translation and in rotation with respect to the first arm;
- the stop element is fixed to the first arm by screws
- the stop member is plate-shaped
- the assembly comprises a mounting plate for an actuator of the scissor lift mechanism, the mounting plate being mounted to the first arm;
- An end of the mounting plate is mounted to the first arm through the axis, the mounting plate being mounted on the axis and sandwiched between the stop member and the first arm;
- the assembly comprises at least a second axis through which one end of the mounting plate is mounted to the first arm and wherein: the beam forming the first arm has:
- the mounting plate is mounted on the second axis and sandwiched between the first arm and a second stop member removably attached to the first arm, the second stop element interfering with the second axis by shape cooperation for block the translation of the second axis relative to the first arm;
- the second stop element is identical to the first stop element
- the assembly comprises two further scissor arms pivotally mounted together about the axis, the other two arms being axially spaced from the first and second arms, the other two scissor arms being identical to the first and second scissor arms and held on the axis in the same way as the first and second scissor arms.
- the invention proposes a lifting platform comprising a chassis, a work platform and a scissor lift mechanism mounted on the frame and supporting the work platform to move it upwards, in which the scissor lift mechanism comprises at least one scissor arm assembly according to the first aspect. It is advantageous that all the scissor arms at their different pivotal connection areas with the other scissor arms of the lifting mechanism and the manner of pivotably assembling them are made in accordance with the scissor arm assembly such as defined according to the first aspect of the invention.
- Figures 1 and 2 each show a perspective view of the same double scissor lift platform of the prior art, its working platform being respectively in the lowered position and in the raised state.
- Figure 3 is a perspective view of the scissor lift mechanism of the aerial platform of Figures 1 and 2.
- FIG. 4 is a perspective view of the one-piece assembly formed by the internal beams of the second scissor stage of the lifting mechanism of FIG. 3.
- Figure 5 is a partial sectional view of the assembly, at one end, of the one-piece assembly of Figure 3 with the outer beams of the third scissor stage.
- FIG. 6 is a perspective view of the scissor lift mechanism according to one embodiment of the invention which is intended to replace that of FIG. for the lifting platform of Figures 1 and 2, the latter being viewed from a point of view placed on the other side of the lifting mechanism with respect to Figure 3.
- FIG. 7 is a partial sectional view showing the assembly of two inner scissors arms of the second stage with the two outer arms of the third stage of the lifting mechanism of FIG. 6.
- Figures 8 and 9 each show a perspective view of an inner scissor arm of the second stage of the lifting mechanism of Figure 6, the first showing the outward side of the aerial lift and the second showing the side towards the inside of the aerial platform, that is to say the side of the arm that faces the other set of stacked scissors.
- Figure 10 is a perspective view of a stop plate used in the assembly illustrated in Figure 7.
- FIG. 11 is a perspective view of an arm pivot axis of the lifting mechanism of FIG. 6.
- FIG. 12 is a local sectional view taken perpendicular to the pivot axis at one of the stop plates of the portion of the assembly shown in FIG. 7.
- Figure 13 is a local perspective view of the lifting mechanism of Figure 6 made at the mounting plates of one end of the hydraulic actuator cylinder.
- Fig. 14 is a perspective view of one of the jack mounting plates visible in Fig. 13.
- FIG. 15 is a view in local section through the arms to which the mounting plates of the jack of FIG. 13 are mounted.
- FIG 6 shows an overview of the scissor lift mechanism which is intended to replace that of the prior art of Figure 3 in the aerial platform of Figures 1 and 2.
- the general configuration of the lifting mechanism is similar to that of Figure 3. Like this, it comprises two sets of scissors parallel and distant from each other.
- Each set of scissors comprises pairs of tubular beams hinged together in their center in the manner of scissors, a plurality of such scissors being mounted one above the other by their ends hinged together: cf. the four pairs (121, 122), (123, 124), (125, 126) and (127, 128) defining the first set of stacked scissors and the four pairs of scissors (131, 132), (133, 134) , (135, 136) and (137, 138) defining the second set of stacked scissors.
- the section of the tubular beams is preferably rectangular or square, but may be different.
- the lifting mechanism also includes 4 stages of scissors referenced from 11 to 14, but there may be more or less. It also includes the axes 15 and 16 mounted at the lower ends of the beams of the first stage 11 to be mounted on the frame 1 pivotally connected to the first and slidably connected to the second. In the same way, there are the axes 17 and 18 mounted at the upper ends of the beams of the last stage 14 to be mounted under the working platform 3 in pivotal connection for the first and in sliding connection for the second . There is also the hydraulic cylinder 4 to actuate the scissor mechanism which is mounted between the first and third scissor stages 11, 13. Alternatively, the cylinder 4 can be mounted between other stages of scissors or between the chassis 1 and one of the scissor stages. It can also be provided several cylinders 4 instead of one, each can be mounted on different scissor stages.
- Figure 7 shows the structure of the inner beam 124 and the outer beam 125 of the first set of scissors stacked at their pivotal connection, and how to assemble them. It is the same for the inner beam 134 and the outer beam 135 of the second set of stacked scissors.
- the structure of the beams 124, 125 because the structure of the beams 134, 135 and their pivoting assembly are identical.
- the structure of all the scissor beams at their different pivotal connection areas with the other scissor beams of the lifting mechanism and the manner of pivotally assembling them are preferably always the same. Therefore, the following description applies to any pivotal connection between any scissor beam with another scissor beam of the lifting mechanism, whether it is a connection in their central part or in their zone. end, any differences in implementation being mentioned where appropriate.
- FIGS. 8 and 9 show in an isolated manner the beam 124 on both sides, it being specified that this description also applies to the beam 134. It is possible to distinguish the three pivot axis passages which traverse the beam 124 from one side to the other : one at each end for mounting in pivotal connection with the beams 121 and 125 and one which is central for mounting in pivotal connection with the beam 123.
- a reinforcing plate is welded on each side of the beam 124 of preferably over the entire contour of the reinforcement plate: cf. the reinforcing plates 80 and 81 at each end axis passage of the beam and the reinforcing plates 80A, 81A at the central axis passage of the beam 124.
- the reinforcing plates 81 are identical to the reinforcing plates 80 , but they are crossed in addition by two threads - visible, but not referenced - which also cross the side of the beam 124 on which they are welded. These threads are intended to receive screws 95 visible in Figure 7.
- the reinforcing plates 80A and 81A are identical to the reinforcing plates 80 and 81 respectively, except to note that the axis passage y is centered while the passage of The axis is off-center for the reinforcing plates 80 and 81 because of its arrangement towards the end of the beam. The threads are placed symmetrically on either side of the axis passage in the case of the plates 81 and 81 A.
- Each of the axis passages consists of two axis passage holes 103, 104.
- the axis passage hole 103 is defined by the through hole together the reinforcing plate 80, respectively 80 A and the side wall of the beam 124 on which it is welded.
- the axis passage hole 104 is defined by the through hole together the reinforcing plate 81, respectively 81A and the side wall of the beam 124 on which it is welded.
- the axis passage defined by the holes 103, 104 of the beam 124 is traversed by a pivot axis 70.
- the axis 70 is supported circumferentially in the first through hole 103 at a time by the reinforcing plate 80 and the wall of the beam 124 on which it is welded.
- the axis 70 is circumferentially supported in the second through hole by both the reinforcing plate 104 and the wall of the beam 124 on which it is welded. Is visible in Figure 7 the fact that the axis of the beam passage 124 is free of socket or similar piece connecting the two opposite walls of the beam 124 unlike the case of the prior art.
- the scissors arm formed by the beam 124 with its reinforcing plates 80, 81 circumferentially supports the axis only by means of the two through holes 103, 104. Therefore, the skilled person will choose the thickness reinforcing plates 80, 81, respectively 80A, 81A, suitably for the pivot axis 70 to be supported under satisfactory conditions by the two through-holes 103, 104.
- the outer scissors arms formed by the beams 125, 135 are preferably identical to the inner ones 124, 134, with two exceptions that will be mentioned hereinafter.
- the beams 125, 135 each have a reinforcing plate 82 welded to each side of the beam at the axis passage through which the axis 70 passes, but - first difference - there are no threads to receive screws 95.
- each of the axis passages consists of two axial passage holes 101, 102. All the considerations mentioned above concerning the circumferential support of the axis 70 in the axis passage holes 103, 104 are also valid for the axis passage holes 101, 102, unless specified - second difference with the beam 124 - that a plain bearing ring 83 is mounted in each axis passage hole 101, 102 to reduce friction with the axis 70. As can be seen in Figure 7, each bearing ring 83 is stopped axially towards the inside of the beam 125 by a shoulder formed in the hole corresponding to the axis 101, 102.
- the beam 125 is free to pivot about the axis 70 while it is locked in rotation relative to the beam 124 as we shall see.
- the axis passage holes 101, 102 are free of plain bearings, but are machined and optionally surface treated or coated to form plain bearings. Locking the axis 70 in rotation with respect to the beam 124 avoids having to also arrange smooth bearings in the through holes 103, 104.
- the two beams 124, 125 are free to rotate relative to the axis 70.
- a washer 100 is preferably mounted on the axis 70 between the beams 124 and 125 in order to limit the friction between them during their pivoting.
- the axis 70 is locked in translation relative to the two beams 124, 125, and also with respect to the beams 134, 135. This can be achieved by any appropriate means, for example an elastic ring 85 on the side of the outer beam 125 and a shoulder on the axis 70 on the side of the inner beam 124.
- a stop member removably attached to the beam 124 and interfering with the axis 70 by cooperation of form to stop both translation and rotation of the axis 70 relative to the beam 124.
- the stop member is preferably made in the form of a plate 90 illustrated in FIG. 10.
- the stop plate 10 has a notch 92 having two parallel edges and two smooth holes 91.
- the two smooth holes 91 serve to fix the stop plate 90 on the reinforcing plate 81 of the beam 124 by means of the screws 95 screwed into the two tappings formed in the reinforcing plate 81 and the corresponding wall of the beam 124.
- the parallel edges of the notch 92 serve to engage two parallel grooves 71 and diametrically opposite formed in the axis 70 for this purpose: cf. the local cut perpendicular to the axis 70 at the two grooves 71 of Figure 12.
- FIG. 11 shows the axis 70 in perspective: it shows only one of the two grooves 71 for the connection of the axis 70 with the beam 124 due to the perspective. For the same reason, it also shows only one of the grooves 71 for the connection of the axis 70 with the beam 134. It also shows two grooves 72 which are not visible in Figure 7 because optional, but will be useful later. There is still a groove 73 at each end to receive the corresponding elastic ring 85.
- the manufacture of the stop plates 90 and the realization of the grooves 71 - and also 72 if necessary - on the axis 70 are very simple.
- the axis 70 is provided with a single groove 71 with which the stop plate 90 cooperates instead of two diametrically opposed grooves 71 in which case the shape of the notch 92 of the stop plate is adapted in result.
- the embodiment with two grooves 71 diametrically opposed is preferable from the mechanical point of view.
- such a stop member removably attached to the beam 124 and interfering with the axis 70 by shape cooperation is used to stop only the translation of the axis 70 relative to the beam 124 in the case where we do not want to block the rotation of one relative to the other.
- the stop element is permanently fixed on the beam 124, but it is preferable that it is fixed removably as this advantageously allows to disassemble the lifting mechanism in case of failure of an axis of pivoting or scissor arm to replace it.
- the translation and rotation of the axis 70 with respect to the outer beam 125 is blocked instead of the inner beam 124, in which case the above-mentioned stop element can be provided on the side of the outer beam 125. to be removably attached.
- the axis 70 makes it possible to rigidly connect the inner beams 124, 134 to each other, in view of the locking in translation of the axis 70 with respect to the internal beams 124, 134.
- the two sets of parallel scissors are therefore rigidly connected to each other without the use of spacers. This avoids any welds spacers scissor beams that tend to deform the beams.
- the result is a weight gain because a common axis has a material section smaller than that of a spacer.
- the use of a stop element, including in the form of the stop plate 90, which has just been described can also be applied to a short axis of pivoting of scissor beams.
- the passages for the axes 15 and 16 in the lower ends of the scissor arms of the first stage 11, and those for the axes 17 and 18 in the upper ends of the scissor arms of the last stage 1 may advantageously be made of the same way as the passages of the axes of pivoting of the beams between them.
- These axes 15 to 18 can advantageously be maintained in the scissor arms by means of stop elements interfering with these axes in the same manner as described for the axes of pivoting of the scissor arms together, in particular by means of stop plates 90.
- the cylinder rod 4 is mounted to each of the inner scissor beams 126, 136 by means of a respective mounting plate 200 of generally triangular shape.
- Each mounting plate 200 is mounted in the same way to the scissor beam concerned. As a result, it will only be described for beam 126.
- FIG. 14 shows a mounting plate 200. It comprises a projection 201 forming a housing for receiving an end of an axis on which is articulated the end of the rod of the jack 4. It comprises at each end a passage hole of 202, respectively 203 axis, and two smooth holes 204, 205 respectively, made on either side of the axis passage hole.
- one end of the mounting plate 200 is mounted on the end axis 70 pivotally connecting the scissor beams 123, 126 on the one hand and the scissor beams 133 , 136 on the other hand. Since the pivotal assembly of these beams is identical - with one exception - to that described with reference to FIGS. 7 to 12, the same reference numerals have been used to designate identical elements. The only difference from FIG. 7 is that the mounting plate 200 is further mounted on the axis 70 which passes through the through hole 203, the mounting plate 200 being sandwiched between the stop plate 90 and the reinforcing plate 81 of the beam 126.
- the screws 95 are aimed in the reinforcing plate 81 and the corresponding wall of the beam 126 through both the holes 91 of the stop plate 90 and the holes 205 of the Mounting plate 200. Due to the material thickness of the mounting plate 200, the stop plate 90 engages the grooves 72 of the axis 70 provided for this purpose instead of the grooves 71.
- the grooves 72 are identical to the grooves 71 and serve for the same function - already described above - locking the axis 70 relative to the inner beam of scissors through the stop plate 90.
- the grooves 72 are therefore only axially offset relative to the grooves 71, as can be seen in FIG. to take into account the material thickness of the mounting plate 200.
- the grooves 71 are not used in this case and could be omitted from the axis 70.
- the other end of the mounting plate 200 - which corresponds to the through hole 202 - is not mounted on a pivot axis of scissor beams because the mounting plate 200 does not extend to the axis of central pivoting scissor beams 125, 126.
- Such can obviously be the case and the mounting of this other end of the mounting plate on the central pivot axis would be in the same way as for the end corresponding to the hole passage 203 which has just been described.
- the other end of the mounting plate 200 is mounted on a mounting axis 170 dedicated for this purpose alone.
- the axis 170 is received in an axis passage made in the beam 126 which is reinforced by a reinforcing plate 180, 181 welded on each side of the beam, in the same way as for the case of the pivot axis passages. scissor beams.
- These reinforcing plates are also preferably identical to the reinforcing plates 80A, 81 A.
- the mounting plate 200 is mounted on the axis 170 which passes through the through hole 202. The holding in position of the mounting plate 200 against the beam 126 is provided in the same way as at its other end, for which reason the same reference numbers were used to designate identical elements.
- the mounting plate 200 is sandwiched between a stop plate 90 screwed into the reinforcing plate 181 and the beam 126 by screws 95 passing through the holes 204 provided for this purpose.
- This stop plate 90 also cooperates with grooves - similar to the grooves 72 of the axis 70 - formed in the axis 170 to block the translation of the axis 170 relative to the beam 126.
- the plate stop 90 also maintains the axis 170 in the beam 126.
- both ends of the mounting plate may be mounted on a respective dedicated mounting shaft as described, but it is more advantageous to mount the jack mounting plates on at least one pivot axis of scissor beams. or two, for the sake of simplification of manufacture.
- the invention provides a scissor arm assembly for a scissor lift mechanism of the work platform of an aerial work platform, comprising:
- first scissor arm and a second scissor arm pivotally mounted together about an axis
- the third and fourth arms are axially distant from the first and second arms;
- a respective stop member is removably attached to the first and third arms and interferes with the axis by shape cooperation to stop translation of the shaft relative to the first and third arms respectively.
- the first and third arms are preferably mounted on the axis between the second and fourth arms.
- the assembly is free of spacer extending between the first and third arms.
- the stop elements interfere with the axis by shape cooperation to block the axis also in rotation relative to the first arm.
- the axis has at least one respective groove which is each engaged by a respective one of the stop elements to block the axis both in translation and in rotation with respect to first and third arms respectively.
- the stop members are preferably attached to the first and third arms respectively by screws.
- the stop elements may advantageously be in the form of a plate.
- Each of the arms is preferably formed by a tubular beam.
- the invention also proposes a lifting platform comprising a frame, a work platform and a scissor lift mechanism mounted on the frame and supporting the work platform to move it upwards, in which the lifting mechanism scissors comprises at least one scissor arm assembly according to this other aspect of the invention.
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Abstract
Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2982876A CA2982876C (fr) | 2015-04-18 | 2016-04-15 | Assemblage de bras de ciseaux pour mecanisme de levage en ciseaux d'une nacelle elevatrice |
EP16720458.5A EP3286126B1 (fr) | 2015-04-18 | 2016-04-15 | Assemblage de bras de ciseaux pour mecanisme de levage en ciseaux d'une nacelle elevatrice |
CN201680022513.XA CN107531470B (zh) | 2015-04-18 | 2016-04-15 | 用于高空工作平台的剪刀式升降机构的剪刀臂组件 |
US15/567,366 US10358330B2 (en) | 2015-04-18 | 2016-04-15 | Scissor arm assembly for a scissor lifting mechanism of an aerial work platform |
AU2016252090A AU2016252090B2 (en) | 2015-04-18 | 2016-04-15 | Scissor arm assembly for a scissor lift |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1553475A FR3035098B1 (fr) | 2015-04-18 | 2015-04-18 | Nacelle elevatrice a mecanisme de levage en ciseaux |
FR1553475 | 2015-04-18 |
Publications (1)
Publication Number | Publication Date |
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WO2016170251A1 true WO2016170251A1 (fr) | 2016-10-27 |
Family
ID=53484014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/FR2016/050879 WO2016170251A1 (fr) | 2015-04-18 | 2016-04-15 | Assemblage de bras de ciseaux pour mecanisme de levage en ciseaux d'une nacelle elevatrice |
Country Status (7)
Country | Link |
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US (1) | US10358330B2 (fr) |
EP (1) | EP3286126B1 (fr) |
CN (1) | CN107531470B (fr) |
AU (1) | AU2016252090B2 (fr) |
CA (1) | CA2982876C (fr) |
FR (1) | FR3035098B1 (fr) |
WO (1) | WO2016170251A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US10221054B2 (en) * | 2015-08-19 | 2019-03-05 | Vehicle Service Group, Llc | High-strength composite structures for vehicle lifts |
WO2020190534A1 (fr) * | 2019-03-15 | 2020-09-24 | Oshkosh Corporation | Table élévatrice à ciseaux dotée de broches décalées |
Citations (3)
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US5113972A (en) * | 1988-08-10 | 1992-05-19 | Haak Martin Sr | Scissor-type lifting device, particularly for a work platform |
US6276489B1 (en) * | 1999-02-10 | 2001-08-21 | Genie Industries, Inc. | Flanged cross tubes for use in scissors linkages |
US20080105498A1 (en) | 2006-06-12 | 2008-05-08 | Genie Industries, Inc. | Joint assembly and related methods |
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US136883A (en) | 1873-03-18 | Improvement in fire-escapes | ||
US2402579A (en) * | 1945-05-24 | 1946-06-25 | Weaver Mfg Co | Load lifter |
US2921645A (en) * | 1956-10-23 | 1960-01-19 | Fairchild Engine & Airplane | Extensible ladder |
US3442351A (en) * | 1967-01-20 | 1969-05-06 | Patricia D Parrish | Method and apparatus for rapidly establishing an elevated work platform |
US3596735A (en) * | 1969-10-30 | 1971-08-03 | Howard H Denier | Portable elevator working and load-lifting platform |
US3623707A (en) * | 1969-11-05 | 1971-11-30 | Chem Rubber Co | Laboratory jack |
US3880259A (en) * | 1973-02-12 | 1975-04-29 | Autoquip Corp | Power apparatus for truck loading elevator |
US4175644A (en) * | 1973-10-15 | 1979-11-27 | Robert Staines | Scissors lift |
US3920096A (en) * | 1974-07-01 | 1975-11-18 | Upright Inc | Vertical hydraulic ram system for scissors assembly scaffold |
WO1990001456A1 (fr) | 1988-08-10 | 1990-02-22 | Holland Lift B.V. | Mecanisme de levage a parallelogrammes articules pour plateformes de travail |
US5145029A (en) | 1991-09-11 | 1992-09-08 | Kidde Industries, Inc. | Self-storing maintenance stand for a scissor lift aerial work platform |
CA2115870C (fr) | 1993-08-31 | 1999-01-05 | Kenneth J. Zimmer | Plate-forme de travail aerienne munie d'une seule poutre |
US20060180403A1 (en) * | 2005-01-07 | 2006-08-17 | Hanlon Mark T | Screw scissor lift |
CN101993016B (zh) * | 2009-08-12 | 2014-07-09 | 鸿富锦精密工业(深圳)有限公司 | 升降机构 |
CN101723285A (zh) * | 2010-01-07 | 2010-06-09 | 上海攀杰机械有限公司 | 井道型无障碍升降平台 |
US8919735B2 (en) * | 2011-02-24 | 2014-12-30 | Rosenboom Machine & Tool, Inc. | Scissor stack assembly |
US8740191B2 (en) * | 2011-06-10 | 2014-06-03 | Ace Laser Tek, Inc. | Laboratory jack |
US9644378B2 (en) * | 2011-12-12 | 2017-05-09 | Ancra International Llc | Variable height support |
DE202012008386U1 (de) * | 2012-09-01 | 2013-12-02 | Christoph Mohr | Scherenhubtisch |
CN203048502U (zh) * | 2013-01-29 | 2013-07-10 | 浙江大大不锈钢有限公司 | 一种焊管合缝机液压剪刀叉升降台 |
CN203065096U (zh) * | 2013-03-04 | 2013-07-17 | 常州汉肯科技有限公司 | 剪叉杆及其制成的剪叉机构 |
US11383963B2 (en) * | 2017-03-03 | 2022-07-12 | Jlg Industries, Inc. | Obstacle detection system for an aerial work platform |
-
2015
- 2015-04-18 FR FR1553475A patent/FR3035098B1/fr not_active Expired - Fee Related
-
2016
- 2016-04-15 AU AU2016252090A patent/AU2016252090B2/en active Active
- 2016-04-15 WO PCT/FR2016/050879 patent/WO2016170251A1/fr active Application Filing
- 2016-04-15 CN CN201680022513.XA patent/CN107531470B/zh active Active
- 2016-04-15 EP EP16720458.5A patent/EP3286126B1/fr active Active
- 2016-04-15 CA CA2982876A patent/CA2982876C/fr active Active
- 2016-04-15 US US15/567,366 patent/US10358330B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5113972A (en) * | 1988-08-10 | 1992-05-19 | Haak Martin Sr | Scissor-type lifting device, particularly for a work platform |
US6276489B1 (en) * | 1999-02-10 | 2001-08-21 | Genie Industries, Inc. | Flanged cross tubes for use in scissors linkages |
US20080105498A1 (en) | 2006-06-12 | 2008-05-08 | Genie Industries, Inc. | Joint assembly and related methods |
Also Published As
Publication number | Publication date |
---|---|
US10358330B2 (en) | 2019-07-23 |
FR3035098A1 (fr) | 2016-10-21 |
EP3286126A1 (fr) | 2018-02-28 |
AU2016252090A1 (en) | 2017-11-30 |
AU2016252090B2 (en) | 2020-01-30 |
EP3286126B1 (fr) | 2019-09-25 |
FR3035098B1 (fr) | 2017-03-31 |
CN107531470B (zh) | 2019-10-25 |
CA2982876A1 (fr) | 2016-10-27 |
US20180162707A1 (en) | 2018-06-14 |
CA2982876C (fr) | 2023-02-28 |
CN107531470A (zh) | 2018-01-02 |
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