FR3007011A1 - STAFF LIFTING PLATFORM WITH INTEGRATED TURRET - Google Patents

Abstract

The object of the invention is a personnel lifting platform comprising a turret (36) movable relative to a support along a first axis of rotation, an arm whose one end is able to pivot about a second axis of rotation (44) relative to the turret (36), said platform comprising a first actuator (76) having a first end connected to the arm and whose second end comprises a bearing mounted on an axis, the turret comprising a first set of two bearings (84) adapted to support said axis, characterized in that the turret (36) comprises a second set of bearings (86) offset upwardly relative to the first set of bearings (84) and adapted to support said axis.

Description

The present invention relates to a personnel lifting platform incorporating a scalable turret. In known manner, a lifting platform is fixed on a support and comprises a turret movable relative to the support according to a first axis of rotation, an arm whose one end is articulated relative to the turret and whose other end supports a basket in which can settle at least one person. The arm comprises on the one hand a first segment called an antenna whose one end can pivot relative to the turret along a second axis of rotation perpendicular to the first axis of rotation, and secondly, a second segment called a stem whose first end can pivot relative to the second end of the antenna along a third axis of rotation parallel to the second axis of rotation and whose second end is connected to the basket through a hinge which comprises a fourth axis of rotation parallel to the second axis of rotation. rotation. According to a preferred embodiment, the basket may comprise several parts, a first part in the form of a pallet connected to the end of the stem and a second part in the form of a receptacle capable of being movable relative to the first part.

The support of the platform is generally in the form of a tray fixed on the frame of a carrier. Depending on the application, the tray can be equipped with a cell.

To ensure pivoting of the antenna around the second axis of rotation, the arm comprises a first actuator whose first end is fixed below the antenna and whose second end is secured to the turret offset from the second axis of the antenna. rotation.

The second end of the actuator comprises a bearing mounted on an axis supported by a set of two bearings mounted on the turret. This set of bearings is positioned on the turret so as to optimize the recovery of efforts when the carrier does not include a cell. When the carrier vehicle comprises a cell, the mounting of the axis in the first set of bearings is not appropriate because the actuator interferes with the cell when the turret pivots. Therefore, if it is desired to install a cell on a tray equipped with a turret that is not suitable for this, it is necessary to disassemble the first turret to mount a new turret that includes bearings to mount the axis of the turret. actuator positioned adequately so that the actuator does not interfere with the cell during pivoting of the turret. This change is relatively long and expensive. The present invention aims to overcome the disadvantages of the prior art by proposing an evolutionary turret.

For this purpose, the invention relates to a personnel lifting platform comprising a turret movable relative to a support along a first axis of rotation, an arm whose one end is pivotable about a second axis of rotation by relative to the turret, said platform comprising a first actuator whose first end is connected to the arm and whose second end comprises a bearing mounted on an axis, the turret comprising a first set of two bearings adapted to support said axis, characterized in that that the turret comprises a second set of bearings offset upwards relative to the first set of bearings and adapted to support said axis.

The invention provides an evolutionary turret with two sets of bearings to support the end of the actuator controlling the pivoting of the arm relative to the turret. Thus, it is not necessary to change turret when a cell is located on the platform of a carrier. It suffices to modify only the mounting of the axis provided at the end of the actuator, the latter being mounted in the bearings of the first set in the absence of a cell and in the bearings of the second set in the presence of a cell. . Other features and advantages will become apparent from the following description of the invention, a description given by way of example only, with reference to the accompanying drawings, in which: FIG. 1 is a perspective view of a carrying machine equipped of a lifting platform according to the invention in the folded position, - Figure 2 is a perspective view of a carrier equipped with a lifting platform according to the invention in the deployed position, the basket 15 being placed on the ground, - FIG. 3A is a perspective view of a turret according to the invention in a first configuration, FIG. 3B is a perspective view of the turret of FIG. 3A in a second configuration, FIG. 3 is a perspective view illustrating in detail the connection between the turret of FIG. 4 and an actuator provided for rotating the antenna of the arm of the electrical platform. FIG. 6A is a diagram illustrating an arm of a platform according to the invention in a first position; FIG. 6B is a diagram illustrating the arm of FIG. 6A in another position; FIG. a diagram which illustrates the angle of rotation of a segment as a function of the stroke of an actuator; - FIG. 8 is a perspective view of a repository for the basket, and FIG. 9 is a front view. of the repository of Figure 8.

In FIGS. 1 and 2, there is shown in 30 a carrier equipped with a lifting platform 32 fixed on a support 34 (visible in FIG. 4) and which comprises a turret 36 movable relative to the support 34 along a first axis rotation 38, an arm whose one end is articulated relative to the turret and whose other end supports a basket 40 in which can be installed at least one person. As illustrated in FIGS. 1, 2, 6A and 6B, the arm comprises on the one hand a first segment 42 called an antenna whose first end can pivot relative to the turret 36 according to a second axis of rotation 44 perpendicular to the first axis of rotation 38, and secondly, a second segment 46 called stem whose one end can pivot relative to the second end of the antenna 42 along a third axis of rotation 48 parallel to the second axis of rotation 44 and whose second end is connected to the basket 40 through a hinge 50 which comprises a fourth axis of rotation 52 parallel to the second axis of rotation 44.

According to a preferred embodiment, the basket may comprise several parts, a first part in the form of a pallet connected to the end of the stem and a second part in the form of a receptacle capable of being movable relative to the first part. According to one embodiment, the support 34 is fixed on a plate 55 integral with the frame of the carrier machine 30. According to the variants, the plate 55 can support a cell 54, as illustrated in FIGS. 1 and 2. some applications, the tray 55 may not be equipped with a cell.

According to a preferred architecture, the turret 36 is disposed at the front of the plate 34 (at the rear of the cabin of the carrier machine 30), its axis of rotation 38 being disposed in a vertical median plane. Thus, in the folded position as illustrated in Figure 1, the basket 40 is disposed vertically above the rear portion of the plate 55, the arm being disposed in the vertical median plane. A cell 54 has a substantially parallelepipedal shape and comprises at the front a recess for housing the turret 36. It is fixed on the plate 55 between the turret and the basket when the arm is in the folded position, the antenna 42 of the arm being disposed above the top of the cell 54.

Preferably, stabilizing means 56 (for example crutches) are provided at the four corners of the plate 55. Advantageously, the cell 54 is fixed on the plate 55 by means of fasteners which incorporate elastic means in the form of spring washers or blocks of elastic material. These resilient means serve to dampen the forces exerted by the cell on the fasteners during stabilization of the carrier and limit the risk of tearing said fasteners. The cell, its fixing means, the plate, the carrier and the stabilizing means are not further described because they are known to those skilled in the art. The turret 36 comprises a ring 58 integral with the support 34 and a plate 60 pivotally mounted relative to the ring 58 along the first axis of rotation 38. The ring 58 comprises an internal cylindrical surface 62 notched, an outer cylindrical surface 64 coaxial with the inner cylindrical surface 62 and a contact surface 66 attached to the support 34. The outer cylindrical surface 64 has an axis corresponding to the first axis of rotation 38. The contact surface 66 is perpendicular to the first axis of rotation 38. The plate 60 comprises a housing in which is housed at least partially the ring 58, said housing comprising an inner cylindrical surface 68 substantially coaxial with the outer cylindrical surface 64 of the ring. Rolling means (such as for example balls) are interposed between raceways formed respectively in the outer cylindrical surface 64 of the ring gear 58 and the inner cylindrical surface 68 of the plate 60. Of course, the guide between the ring gear and the platen is not limited to this embodiment. The plate 60 comprises a through hole to allow the passage of an output shaft of a motor 70 fixed on the plate 60. The output shaft comprises a pinion 72 which meshes with the internal cylindrical surface 62 notched of the ring 58 Of course, the invention is not limited to these means for rotating the turret 36. The turret 36 comprises two uprights 74.1 and 74.2 parallel and symmetrical with respect to a median plane containing the first axis of rotation 38. The uprights 74.1, 74.2 are secured at a first end to the plate 60 and support at their second ends an axis on which is pivotally mounted the antenna 42 and which materializes the second axis of rotation 44. Thus the antenna can pivot in a pivot plane perpendicular to the second axis of rotation 44.

In the folded position, the antenna is oriented towards the rear of the carrier (indicated by the arrow AR). in this position, to ensure better recovery of forces, the second axis of rotation 44 is offset relative to the first axis of rotation 38 towards the front of the carrier 30 (indicated by the arrow AV), as shown in FIG. figure 4.

For this purpose, each upright 74.1 and 74.2 comprises a lower part slightly inclined in a first direction and an upper part more strongly inclined in the first direction, forming an angle of the order of 55 ° preferably with respect to the first axis of rotation 38, so that the second axis of rotation 44 is disposed opposite the basket 40 relative to the first axis of rotation 38. As illustrated in Figure 1, the lower portion has a height substantially equal to that of a cell and the upper part is inclined so that the second axis of rotation 44 is disposed above the cab of the carrier machine 30 when the arm is in the folded position. To ensure the pivoting of the antenna 42 around the second axis of rotation 44, the arm comprises a first actuator 76 whose first end 78 is fixed under the antenna 42 and whose second end 80 is secured to the turret 36 of staggered manner with respect to the second axis of rotation 44. According to one embodiment, the actuator 76 is hydraulic. As illustrated in FIG. 5, the second end 80 of the actuator 76 comprises a bearing 81 pivotally mounted on an axis 82. For the rest of the description, bearing is understood to mean any housing of cylindrical shape capable of accommodating an axis, a shaft or any other cylindrical male element. To support the axis 82, the amounts 74.1 and 74.2 comprise a first set of bearings 84, one for each amount. This first set of bearings is positioned on the uprights 74.1 and 74.2 so as to optimize the recovery of forces when the carrier does not include a cell. It also makes it possible to pass the antenna under the horizontal to reach more easily the ground in the absence of cell. When the carrier comprises a cell, the mounting of the shaft 82 in the first set of bearings 84 is not suitable because the actuator 76 interferes with the cell as the turret 36 pivots. According to a characteristic of the invention, the amounts 74.1 and 74.2 comprise a second set of bearings 86, one for each amount. This second set of bearings 86 is shifted upwards relative to the first set of bearings 84.

Thus, in the presence of a cell on the plate, the shaft 82 is mounted in the bearings 86 of the second set so that the actuator 76 no longer interferes with the cell during the pivoting movement of the turret 36 around the first rotation axis 38.

Therefore, according to the invention, the turret 36 comprises two sets of bearings to support the end of the actuator 76 controlling the pivoting of the antenna about the second axis of rotation 44. Thus, it is not necessary to change turret when a cell is located on the plate 55 of the carrier. It suffices to modify only the mounting of the axis 82, the latter being mounted in the bearings 84 of the first set in the absence of a cell and in the bearings 86 of the second set in the presence of a cell. Preferably, the distance separating the second axis of rotation 44 and the axis of the bearings 84 of the first game is substantially identical to that separating the second axis of rotation 44 and the axis of the bearings 86 of the second set.

The bearings 84 and 86 are dimensioned to ensure the recovery of efforts. However, insofar as the bearings 86 are not optimally positioned for the recovery of forces, a force return 88 is interposed between the axis 82 and the bearings 84 of the first set to transfer a portion of the forces to said Bearings 84. This configuration makes it possible to limit the dimensions of the bearings 86 of the second set which may be identical to the bearings 84 of the first set. According to an embodiment illustrated in FIG. 5, the force transfer 88 comprises two aligned bearings 90, a bearing 92 and a body 94 which connects the bearings 90 and 92 between them.

The bearings 90 are spaced a distance equal to the operating clearance close to the length of the bearing 81 provided at the end of the actuator 76. Thus, the shaft 82 is mounted in the bearing 81, in the bearings 90 and in the bearings 86 provided at the uprights 74.1, 74.2, the bearings 90 being interposed between the bearing 81 and the bearings 86. The bearing 92 of the force transfer 88 has a length substantially equal to that of the bearing 81 of the actuator 76.

In addition to the force transfer 88, a second axis 96 is mounted in the bearings 84 of the first clearance and in the bearing 92 of the force transfer to ensure the recovery of the forces between the force transfer 88 and the bearings 84 of the first game. To ensure better guidance and limit the movements of the bearings in a direction parallel to the second axis of rotation 44, the uprights 74.1 and 74.2 comprise at the faces oriented towards each other flanges 98 to reduce the spacing between the two uprights. Each flange 98 extends at each level in areas at which the bearings 84 of the first set open and does not cover the areas at which the bearings 86 of the second set open.

The spacing between the flanges 98 is substantially equal to the operating clearance close to the length of the bearings 81 and 92. Similarly, the thickness of the flanges 98 denoted e in FIG. 5 is substantially equal to the operating clearance close to the length of a bearing 90. For operating clearance, means a clearance that allows a relative rotational movement between parts supported by the same axis, while limiting the translations of said parts in the direction of the axis. According to one embodiment, the antenna 42 and the bracket 46 are telescopic. Thus, the antenna and the bracket include at least two segments that slide into each other. As illustrated in FIGS. 6A and 6B, the antenna 42 comprises a last segment 100 and the bracket 46 comprises a first segment 102 pivoting with respect to the last segment 100 around the third axis of rotation 48 and a last segment 104 at the The end of which can pivot the basket 40 according to the fourth axis of rotation 52. Preferably, the last segments 100 and 104 are hollow sections which open at their ends.

The arm comprises a second actuator 106 for causing pivoting of the bracket 46 relative to the antenna 42 along the third axis of rotation 48 and a third actuator 108 to cause the basket 40 to pivot relative to the bracket 46 according to the fourth axis of rotation 52. According to one embodiment, the actuators are hydraulic.

For greater compactness and better protection of the actuators, the latter are inserted into the hollow sections of the last segments 100 and 104. Concerning the articulation between the antenna 42 and the bracket 46, the end of the last segment 100 of the antenna comprises a cap 110 between which is inserted the end 112 of the gallows. The yoke 110 and the end 112 of the bracket are mounted on an axis 114 which materializes the third axis of rotation 48. The articulation between the antenna 42 and the bracket 46 comprises two links 116 and 118. The first link 116 comprises a first end pivoting about an axis of rotation 120 relative to the antenna 42 and a second end pivoting about an axis of rotation 122 relative to the second end of the second link 118, the first end of the second link 118 being pivotable relative to the bracket 46 about an axis of rotation 124. The actuator 106 is inserted in the last segment 100 of the antenna and comprises a body 126 and a rod 128 movable relative to the body, the end of the body 126 opposite the rod 128 being pivotable relative to the antenna 42 about an axis of rotation 130.

According to a feature of the invention, the end of the rod 128 is pivotally connected to the axis of rotation 122 connecting the two links 116 and 118. Preferably, when the rod 128 is halfway, as illustrated in FIG. 6B, the various axes of rotation 120, 122, 124, 130 are implanted so that the straight line passing through the axes of rotation 130 and 124 is approximately perpendicular to the straight line passing through the axes of rotation 120 and 122. Concerning the articulation between the stem 46 and the basket 40, the end of the last segment 102 of the bracket includes a yoke 132 between which is inserted a portion 134 of the basket 140. The yoke 32 and the portion 134 of the basket are mounted on an axis 136 which materializes the fourth axis of rotation 52. The articulation between the bracket 46 and the basket 40 comprises two links 138 and 140. The first link 138 comprises a first end pivoting about an axis of rotation 142 relative to the bracket 46 and a second end pivoting about an axis of rotation 144 relative to the second end of the second link 140, the first end of the second link 140 being pivotable relative to the basket 40 around An axis of rotation 146. The third actuator 108 is inserted into the last segment 102 of the stem and comprises a body 148 and a rod 150 movable relative to the body, the end of the body 148 opposite the rod 150 being pivoted by relative to the stem 46 about an axis of rotation 152. According to a feature of the invention, the end of the rod 150 is pivotally connected to the axis of rotation 144 connecting the two rods 138 and 140. 25 Preferably, when the rod 150 is halfway, as illustrated in FIG. 6B, the various axes of rotation 142, 144, 146, 152 are implanted so that the straight line passing through the axes of rotation 152 and 146 is approximately perpendicularly to the straight line passing through the axes of rotation 142 and 144. According to an important characteristic of the invention, the platform comprises at least two elements (antenna / bracket or bracket / basket) connected by a hinge which comprises a first axis swiveling connection between the two elements. The joint also comprises two links, a first connecting rod whose first end is pivotally mounted relative to the first element about a first axis of rotation and whose second end is pivotally mounted relative to the second end of the second link. around a second axis of rotation, the first end of the second link being pivotally mounted relative to the second element about a third axis of rotation. The hinge also includes an actuator whose first end is pivotally connected to the first member about a fourth axis of rotation and whose second end is pivotally connected to the second axis of rotation. Preferably, when the actuator is halfway, the line passing through the third and fourth axes of rotation is approximately perpendicular to the straight line passing through the first and second axes of rotation. Depending on the case, this configuration can be adapted to the articulation between the stem and the antenna and / or between the stem and the basket. Although the present description mentions only two links, one joint may comprise several sets of two links, each set of two links being arranged in the same way in different planes perpendicular to the axes of rotation. As illustrated in FIG. 7, the angular movement of the stem or of the basket which corresponds to the curve 154 is approximately linear and proportional to the stroke of the rod of the actuator which corresponds to the straight line 156. Thus, according to the configuration, from a simple joint comprising only two rods (or several sets of two rods), the synchronization of the various pivoting movements is simplified insofar as these different angular movements are substantially proportional to the actuator stroke on the assembly of the swivel range. According to another particularity of the invention, the carrier machine 30 comprises a receiving base 158 also called a resting device against which the basket 40 can be supported when the arm is in the folded position during the transport phases, illustrated in FIGS. 9.

According to one embodiment, the reception base 158 is fixed on the plate. The repository 185 comprises a frame 160 and a plate 162 movable relative to the frame against which can support the basket or any other part of the arm. The basket will be privileged insofar as it is the element furthest from the second axis of rotation 44.

The reel 158 includes biasing means 164 which tend to oppose the movements of the movable plate 162 when the basket or any other part of the arm exerts a force on said plate. According to one arrangement, the basket 40 tends to exert a downward force against the plate 162 and the return means 164 exert an upward force against the force exerted by the basket 40. one embodiment, the chassis 160 comprises a bottom 166 fixed to the square or rectangular plate, and two wings 168, 168 'which form with the bottom a U. A cross member 170 connects the two wings 168, 168'. The plate 162 can pivot relative to the cross member 170 along an axis of rotation 172 (for example by two hinges 174). When the basket is not in contact with the plate 162, the latter is parallel to the bottom.

The return means 164 are interposed between the bottom 166 and the plate 162 and tend to separate the plate 162 from the bottom 166. According to one embodiment, they are in the form of an elastomeric block. Advantageously, at least one tab 176 makes it possible to limit the rotation of the plate 162 so that it remains in a substantially horizontal position parallel to the bottom. According to one embodiment, the recess 158 comprises two tabs 176 disposed on either side of the hinges 174. In a preferred location, the axis of rotation 172 is perpendicular to the direction of the arm when the latter is in the folded position and the plate 162 is disposed opposite the turret relative to said axis of rotation 172. Preferably, centering means are provided above and on either side of the plate 162 to guide the part of the basket according to one embodiment, the guide means comprise two inclined flanks 178, 178 'which form a V and whose lower edges are in contact with the upper edges of the flanges 168 , 168 '. The repository 158 limits the movements of the basket during transport. Thus, when the arm is folded for the transport phases, the basket 40 is positioned to come into contact with the plate 162 and to exert a force against the return means 164. Thus, at rest, the basket 40 bears against the plate 162 and is immobilized because it exerts a force on said plate 162 against the biasing means 164. Advantageously, the reel 158 comprises means for detecting whether the basket is bearing against the plate 162, the force exerted on the plate 162 or the movement of the plate 162 to be greater than a certain threshold to be sure that the basket is perfectly immobilized during transport. According to one embodiment, this detection means is in the form of a switch, offset with respect to the axis of rotation 172 against which the plate 162 can bear when it is translated downwards because of the the force exerted by the basket 40. Thus, as soon as the plate 162 comes into contact with the contactor, the movement of the basket is stopped.

According to one configuration, the articulation between the bracket and the basket may allow a pivoting movement about an axis of rotation perpendicular to the fourth axis of rotation 52. This movement may make it possible to modify the inclination of the bottom of the basket when for example the carrier is positioned on a terrain with a slope. in this case, the reef 158 advantageously comprises two detection means 180, 180 'offset in height, the first detecting means 180 triggering a correction operation of the inclination of the basket, the second detecting means 180' triggering the stop movements, and possibly other actions (for example the authorization to retract the stabilization means, to leave with the carrier, ...). Each detection means is in the form of a contactor. According to one embodiment, these detection means 180, 180 'are offset in the direction of the axis of rotation 172. Thus, the plate 162 comes into contact with a first sensor 180 and then with a second sensor 180'.

These two contactors may each transmit a signal to a controller responsible for controlling and controlling the movements of the various elements of the arm. The operating principle for correcting the inclination of the bottom of the basket is as follows: When the plate 162 comes into contact with the first contactor 180, the latter transmits a signal to the controller. On receipt of this signal, the latter controls the pivoting of the basket 40 so that the bottom of the latter is approximately parallel to the plate. For this purpose, the controller uses data relating to the inclination of the bottom of the basket and the plate respectively provided by integral inclinometers respectively of the basket and the plate. When the bottom of the basket is parallel to the plate, the controller causes the basket to descend until the plate 162 comes into contact with the second switch 180 'which then controls the stopping of the movements. The basket is thus perfectly positioned and immobilized for the transport phase.

Claims (8)

REVENDICATIONS1. Personnel lifting platform comprising a turret (36) movable relative to a support (34) along a first axis of rotation (38), an arm having a first end adapted to pivot about a second axis of rotation (44) relative to the turret (36) and whose other end supports a basket (40) in which a person can be installed, said platform comprising a first actuator (76) whose first end is connected to the arm and whose second end comprises a bearing (81) mounted on an axis (82), the turret comprising a first set of two bearings (84) adapted to support said axis (82), characterized in that the turret (36) comprises a second set of bearings (86) shifted upwardly relative to the first set of bearings (84) and adapted to support said axis (82). 2. Platform according to claim 1, characterized in that the turret comprises a force transmission (88) interposed between the axis (82) mounted in the bearings (86) of the second set and a second axis (96) mounted in the bearings (84) of the first set. 3. Platform according to claim 2, characterized in that the turret (36) comprises two uprights (74.1, 74.2) which each comprise a bearing (84) of the first set and a bearing (86) of the second set, the uprights (74.1 , 74.2) being parallel and symmetrical with respect to a median plane containing the first axis of rotation (38). 4. Platform according to claim 3, characterized in that the amounts (74.1, 74.2) comprise at the faces oriented towards each other flanges (98) to reduce the spacing between the two uprights, each flange (98) extending at each post in areas at which the bearings (84) of the first set open and does not cover the areas at which the bearings (86) of the second set open. 5. Platform according to claim 4, characterized in that the force transmission (88) comprises two bearings (90) aligned and spaced by a distance equal to the operating clearance close to the length of the bearing (81) provided in FIG. end of the actuator (76), a bearing (92) in which can be mounted the second axis (96) and a body (94) which connects the bearings (90, 92) therebetween. 6. Platform according to claim 5, characterized in that the distance between the flanges (98) is substantially equal to the operating clearance close to the length of the bearing (81) provided at the end of the actuator (76) and to the length of the bearing (92) in which the second axis (96) is mounted. 7. Platform according to claim 5 or 6, characterized in that the thickness of the flanges (98) is substantially equal to the operating clearance close to the length of a bearing (90) in which is mounted the shaft (82) . 8. Platform according to one of claims 3 to 7, characterized in that each amount (74.1, 74.2) comprises a lower portion slightly inclined in a first direction and an upper part more strongly inclined in the first direction so that the second axis of rotation (44) is disposed opposite the basket (40) relative to the first axis of rotation (38).