FR2966440A1 - Foot for transporting wooden pallet, has upper part located adjacent to main radial edge of lower flange, and ramp engaged in radial slot of orifice of plate to guide radial edge of plate in groove by rotation of foot around vertical axis - Google Patents

Abstract

The foot (1) has a ramp (8) projecting on an outer periphery of a body (3) that is arranged below a main notch (50). The main notch is provided in a lower flange (5). A lower part (80) is positioned adjacent to a rear main radial flange of the lower flange. An upper part (81) is located adjacent to a main radial edge (510) of the lower flange. The ramp is engaged in a radial slot of an orifice of a plate to guide a radial edge of the plate in a groove by rotation of the foot around a vertical axis (Z). An independent claim is also included for a method for assembling a foot.

Description

The present invention relates to a transport pallet foot, to a transport pallet equipped with such a foot and to a method of mounting such a foot on a pallet pallet. More particularly, it relates to a transport pallet foot of compressible material, such as cardboard, in other words to a foot intended to be fixed on a pallet load-bearing tray made of a compressible material. In the field of transport of loads, it is known to use paperboard pallets which, compared to wooden or plastic pallets, have a low weight, thus improving their handling. However, when these cardboard pallets are wet, for example by bathing in a puddle, they lose strength and quickly become unusable. To meet this problem of wetting pallets in cardboard, it is known to provide the load bearing trays of feet in order to raise them above the ground. It is thus known from document FR 2 940 792 A to mount each foot tight in a blind hole made in the load-bearing tray and to stick these feet in these holes by means of an expandable glue. It is also known from EP 0 853 047 A1 to directly glue the feet to the underside of the load plate. The disadvantages of these feet stuck on the tray are that they are not reusable or dismountable once glued and they are difficult to store and transportable. It is also known from WO 04 083 047 A2 and EP 1 499 533 A1 to provide a two-part pallet foot, with a lower part arranged under the load-carrying tray and an upper part which passes through an orifice formed in the tray to cap the lower part and to cooperate with the latter by screwing. The disadvantages of these two-part feet are that they are expensive to produce and difficult to store and transport because of having two separate parts that require care to not separate them. In addition, these two-part feet generally require a tool for the two parties to cooperate with each other, and many breaks are observed during their installation on the trays.

The present invention aims to solve all or part of the aforementioned drawbacks and, for this purpose, it proposes a foot for pallet transport, comprising: - a body of revolution extending around a vertical axis, intended to be introduced inside a circular orifice provided with at least one radial slot formed in a load-bearing tray of the pallet, said radial slot being delimited by a radial edge of the plate; two horizontal flanges, respectively upper and lower, protruding radially on the outer periphery of the body and delimiting a groove capable of receiving the radial edge of the load-bearing tray, the lower flange having at least one main notch giving access to the groove, said main notch being delimited by two main radial edges, respectively front and rear; and - at least one ramp projecting from the outer periphery of the body, disposed below the main notch provided in the lower flange and having a slope relative to the horizontal in a first orientation, right or left, with a lower portion disposed on the side of the main rear radial flange of the lower flange and an upper portion disposed on the side of the main radial front flange of the lower flange, said ramp being intended to engage in the radial slot of the hole of the load plate and guiding the radial edge of said plate inside the groove by rotation of the foot about the vertical axis. Thus, this foot has the advantage of being able to be mounted on the plate simply, efficiently and quickly, by engaging the foot in the hole of the pallet plate until the lower part of the ramp engages in the radial slot of the hole of the load plate, then turning the foot. The radial edge of the load plate can engage the groove by mounting the ramp during the rotation of the foot and then through the main notch of the lower flange to fit between the two flanges. The rotation of the foot finally allows to block at least partially around the orifice of the plate between the two flanges of the foot. At the beginning of rotation and as long as the radial edge of the load plate is guided by the ramp, the foot moves helically, like a screwing movement of the foot into the hole of the load plate. . Then, once the radial edge of the load plate is inserted into the groove, the foot simply turns to finalize the locking of the foot in the hole of the load plate by jamming the periphery of this hole in the throat , between the two horizontal flanges of the foot. The direction of rotation for mounting the foot, said direction of assembly, corresponds in some way to a direction of screwing and is given by the orientation of the slope of the ramp. Two orientations are possible for the slope of the ramp: a straight orientation in which the slope of the ramp is inclined from bottom to top around the vertical axis in the counterclockwise direction of rotation about this vertical axis, and a left orientation wherein the slope of the ramp is inclined from the bottom upwards about the vertical axis in the clockwise direction about this vertical axis. Thus, the slope of the ramp may have one or other of these two orientations. Because the pallet foot is fixed on the load plate by rotation, the pallet foot is very subject to stress during its assembly on the load plate. In addition, such a foot does not require the use of an additional piece that would hatch and cooperate with the foot to secure the foot on the load plate. Indeed, such a foot according to the invention essentially requires the body which protrude the two flanges and the ramp. In addition, this ramp makes it possible to compress the radial edge of the load plate, when the latter is made of compressible material such as cardboard, to reach the sufficient thickness corresponding to the height of the groove.

Advantageously, the body of revolution is a hollow body, preferably provided with a frustoconical portion, to allow the interlocking of feet in each other, thus facilitating their storage and transport. According to one characteristic, the main radial front flange of the lower flange is located at a distance from the upper part of the ramp, and this main front radial flange has a slope relative to the horizontal, in the first orientation, extending towards the down outside the throat. Thus, once the radial edge of the load plate arrives at the top of the ramp, especially in compressed form, this edge can arch correctly without having to stress it too much during the rotation of the foot, then the main radial rim front of the lower flange brings this radial edge horizontally in the groove by guiding it in it; this radial main front edge has for this a slope adapted to form a kind of bottleneck to the throat. In a variant, the main front radial flange of the lower flange directly extends the upper part of the ramp.

According to another feature, the rear main radial flange of the lower flange has a slope relative to the horizontal, in the first orientation, extending upwardly inside the groove on a height substantially equivalent to the height of the groove, and the upper flange has a notch through which opens said rear main radial flange of the lower flange. This shape of the rear main radial rim clears the foot of the load plate correctly. Indeed, it suffices to continue the rotation in the same direction until the radial edge of the plate arrives on the rear main radial rim and rises along its slope to exit the throat of the foot. Then simply continue this rotation to finish out completely around the hole in the tray of the throat of the foot. Thus, the direction of rotation for mounting the foot also corresponds to the direction of rotation for dismounting the foot. In a particular embodiment, the foot comprises at least one stopping abutment in rotation of the foot in the hole of the load-bearing plate, said stopper comprising a substantially vertical abutment piece mounted on the lower flange. Thus, when the foot is assembled on the load plate, this foot is rotated (as described above) until the radial edge of the plate abuts against this stopper. Thus, the operator knows that the assembly is finished and that he does not need to turn the foot more. Advantageously, the stopper comprises an elastically deformable connecting arm projecting from a circumferential edge of the lower flange and connecting the abutment piece to said circumferential edge of the lower flange. In this way, by acting on the elasticity of the connecting arm, the stop is movable between: - a first position in which the stop piece is at the groove and blocks the rotation of the foot in the direction of the assembly, thus marking the end of the assembly; and a second position in which the abutment piece is located below the groove and allows the rotation of the foot in the mounting direction, in particular to allow dismantling of the foot as described above. Advantageously, the upper flange vertically covers at least part of the upper part of the ramp. Thus, during the rotation of the foot, the radial edge of the load plate follows the ramp, comes into abutment against the upper flange, is eventually compressed between the top of the ramp and the upper flange, arches and engages in the throat of the foot. According to a possibility of the invention, the upper flange has a notch defined by two radial flanges, respectively front and rear, said radial front flange of the upper flange being located above the main notch provided in the lower flange substantially in the extension of the ramp. Thus, during the rotation of the foot, the radial edge of the load-bearing plate follows the ramp, comes into abutment against the radial front edge of the upper flange, is eventually found compressed between the top of the ramp and the radial flange before the flange superior, arches and engages in the throat of the foot. Advantageously, a fin protrudes from the radial rim before the upper flange, said fin having a slope relative to the horizontal, in a second orientation opposite to the first orientation, extending upwardly outside the groove and facing the ramp. The presence of this fin on the radial front edge of the upper flange guides the radial edge of the load plate inside the groove, forming in some a bottleneck to the throat. In a particular embodiment, the lower flange comprises at least one secondary notch delimited by two secondary radial flanges, respectively front and rear, the radial flanges and notches of the lower flange being arranged successively in the following manner: main notch, front main radial flange , rear secondary radial flange, secondary notch, secondary radial forward flange, rear main radial flange, main notch. In this embodiment, the lower flange comprises at least two arcuate portions separated from each other by the main and secondary indentations.

According to one characteristic, the or each secondary secondary radial edge has a slope relative to the horizontal, according to the first orientation, extending downwardly outside the groove, the secondary radial rear edge being in particular horizontal. Such a configuration is advantageous for optimally guiding the radial edge of the load plate in the groove of the foot. According to another characteristic, the upper flange has at least one window extending partly above the secondary notch of the lower flange, said window being delimited by a radial side located above the secondary notch of the lower flange. and from which protrudes a fin having a slope relative to the horizontal, in a second orientation opposite to the first orientation, extending upwardly outside the groove. Such a window is advantageous for following the guide of the radial edge of the load plate in the groove of the foot, and thus ensuring that the assembly is going well. In a particular embodiment, the foot is made in one piece, in particular by molding a plastic material. The invention also relates to a transport pallet 20 comprising: a load-carrying tray made in particular of compressible material, such as cardboard, in which is provided at least one circular orifice provided with at least one radial slot; and at least one foot according to the invention, said foot being fixed on the load-carrying tray 25 by receiving at least part of the periphery of said orifice of the tray inside the throat of the foot between the two flanges. The invention also relates to a method for mounting a foot according to the invention on a transport pallet load-carrying tray in which is formed at least one circular orifice provided with at least one radial slot delimited by a border radial of the tray, said method comprising the following steps: vertical engagement of the foot in the hole of the load-bearing tray; - engagement of the ramp of the foot inside the radial slot of the hole of the load plate; - rotation of the foot around the vertical axis, so that the radial edge of the load plate is guided on the ramp to the inside of the throat of the foot, - continued rotation of the foot around the vertical axis so that at least a portion of the periphery of said tray orifice is blocked inside the throat of the foot between the two flanges. Other features and advantages of the present invention will appear on reading the detailed description below, of an example of non-limiting implementation, with reference to the appended figures in which: FIGS. 1 to 5 are schematic perspective views at different angles of a foot according to the invention; - Figure 6a is a schematic side view and transparency of the foot of Figures 1 to 5 engaged in a load-bearing tray of thickness substantially identical to the height of the throat of the foot; - Figure 6b is a schematic side view and transparency of the foot of Figures 1 to 5 engaged in a load-bearing tray greater than the height of the throat of the foot; FIG. 7 is a partial schematic view from above of a load-bearing platform provided with a hole adapted for assembly with the foot of FIGS. 1 to 5. FIGS. 1 to 6 illustrate a foot 1, in accordance with FIG. the invention, for a transport pallet; such a transport pallet comprising a load plate 2, illustrated in part in Figure 7, in which is formed at least one circular orifice 20 provided with a radial slot 21 delimited by two radial edges, respectively right and left 22d 22g, vis-à-vis. This foot 1 is made in one piece, in other words the foot 1 constitutes a single piece. The foot 1 is made of plastic, in particular by a method of molding a plastic material. Foot 1 comprises a hollow body 3 of revolution extending around a vertical axis Z with a frustoconical lower portion 30 extended by a cylindrical upper portion 31 of circular section. The body 3 also has a horizontal bottom wall 32, in which openings are provided which plug the bottom of the lower part 30. The upper part 31 is open at the top and has a cylindrical rim 33 upper.

The foot 1 also comprises an upper horizontal flange 4, extending in a plane perpendicular to the vertical axis Z, and protruding radially on the outer periphery of the upper cylindrical portion 31 of the body 3. The upper flange 4 is flush with the upper cylindrical rim 33 of the body 3. The upper flange 4 is in the form of an annular sector which does not completely go around the cylindrical upper portion 31 of the body 3. In this case, the upper flange 4 extends over an angular sector of approximately 225 °; this angular sector can of course take other values. Thus, the upper flange 4 has two free radial rims, respectively before 40 and rear 41, which delimit on either side a notch 42 in the upper flange 4. This notch 42 extends over a sector of complementary angle of that of the upper flange 4, so of the order of 360 - 225 = 135 °. The radial front flange 40 precedes the rear radial flange 41 if the contour of the lower flange 4 is followed in the anticlockwise direction of rotation around the vertical axis Z. The upper flange 4 comprises a fin 43 projecting from the front radial flange 40 and having a slope relative to the horizontal, in a left orientation, extending upwardly, so that said fin 43 protrudes from the upper flange 4 and the upper cylindrical flange 33 of the body 3. We speak of a left orientation in the direction where the slope of the fin 43 is inclined from the bottom upwards about the vertical axis Z in the clockwise direction about this vertical axis Z. The upper flange 4 has two separate arched windows 44 from each other by a partition wall 45 and each extending over a sector of angle of the order of 70 to 90 °. Each window 44 is bounded radially by two radial sides, respectively front 46 and rear 47, where the front radial side 46 precedes the rear radial side 47 if one follows the contour of the window 44 in the counterclockwise direction of rotation around the window. vertical axis Z.

The upper flange 4 has two fins 48 protruding from the two respective rear radial sides 47, each fin having a horizontal slope, in a left orientation, extending upwards, so that these fins 48 protrude upper flange 4 and upper cylindrical flange 33 of the body 3.

The foot 1 also comprises a horizontal lower flange, extending in a plane perpendicular to the vertical axis Z, and protruding radially on the outer periphery of the cylindrical upper portion 31 of the body 3. The lower flange 5 is arranged in below the upper flange 4 at a vertical distance or height H predetermined, for example of the order of 5 to 15 millimeters depending on the thickness of the load-carrying tray 2. Thus, the lower flange 5 and the upper flange 4 delimit between they a horizontal groove 6 of height H. As the upper flange 4 does not extend around the entire periphery of the body 3 and only on a given angular sector, for example about 225 °, then the groove 6 also extends on at most this angular sector.

The lower flange 5 comprises three annular sectors 51, 52, 53 spaced from each other and delimiting between them indentations in the lower flange 5. In this case, the lower flange comprises a first annular sector 51, a second annular sector 52 and a third annular sector 53.

The first annular sector 51 defines with the third annular sector 53 a so-called main notch 50 which extends over a sector of angle of the order of 30 °. The first annular sector 51 defines with the second annular sector 52 a so-called secondary notch 54, and the second annular sector 52 defines with the third annular sector 53 another so-called secondary notch 54; the secondary indentations 54 extending over an angle sector of the order of 30 °. The three annular sectors 51, 52, 53 each extending over an angle sector of the order of 90 °. The first annular sector 51 has two radial flanges, respectively before 510 and rear 511; the front radial flange 510 preceding the rear radial flange 511 if one follows the contour of the first annular sector flange 51 in the anticlockwise direction of rotation about the vertical axis Z. The second annular sector 52 has two radial flanges, respectively before 520 and back 521; the front radial flange 520 preceding the rear radial flange 521 if one follows the contour of the second annular sector flange 52 in the counterclockwise direction of rotation about the vertical axis Z. The third annular sector 53 has two radial flanges, respectively before 530 and rear 531; the front radial flange 530 preceding the rear radial flange 531 if the contour of the third annular sector flange 53 is followed in the anticlockwise direction of rotation around the vertical axis Z.

Thus, the main indentation 50 is delimited or bordered radially by the radial rim 510 before the first annular sector 51 and by the rear radial rim 531 of the third annular sector 53. The radial rim before 510 of the first annular sector 51 is also called in the description of the main radial forward rim, while the rear radial rim 531 of the third annular sector 53 is also referred to in the description as the principal radial ridge, in the sense that they delimit the main notch 50. One of the secondary notches 54 is delimited radially by the rear radial flange 511 of the first annular sector 51 and the front radial flange 520 of the second annular sector 52. The other secondary notch 54 is delimited radially by the rear radial flange 521 of the second annular sector 52 and by the rim front radial 530 of the third annular sector 53. These radial flanges, respectively before and rear, 511, 520, 521, 530 are also referred to in the description secondary radial flanges, respectively front and rear, in which they delimit the secondary notches 54. The front radial flange 510 of the first annular sector 51 (or front main radial flange ) has a slope with respect to the horizontal, in a straight line, extending downward outside the groove 6. This is a straight orientation, opposite to the left orientation, in the sense that the slope of this radial rim before 510 is inclined from the bottom upwards about the vertical axis Z in the counterclockwise direction of rotation about the vertical axis Z. Similarly, the radial front rims 520, 530 of the second 52 and third 53 annular sectors (or forward secondary radial flanges), each have a slope relative to the horizontal, in a straight line, extending downwardly outside the groove 6. The rear radial flanges 511, 521first 51 and second 52 annular sectors (or rear secondary radial flanges) are horizontal, otherwise they do not have a slope relative to the horizontal. The rear radial flange 531 of the third annular sector 53 (or rear main radial flange) has a slope with respect to the horizontal, in a straight orientation, extending upwardly inside the groove 6 to an equivalent height at the height H of the groove 6, so that this rear radial flange 531 arrives at the upper cylindrical flange 33 of the body 3. The foot 1 further comprises a stopper 7 comprising: a linkage arm 70 elastically deformable projection projecting from a circumferential edge of the third annular sector 53 of the lower flange 5, said connecting arm 70 extending substantially along the contour of this circumferential edge; - An abutment piece 71 disposed on the free end of the connecting arm 70 and extending upwardly substantially vertically.

In the rest position, the link arm is substantially coplanar with the third annular sector 53 of the lower flange 5 and then the stop piece 71 is located at the groove 6 and extends substantially over the entire height H of the groove 6 In the stressed position, when pressing down on the abutment piece 71, the connecting arm 70 can be bent downwards until the abutment piece 71 is below the groove 6 The relative arrangement between the upper flange 4 and the lower flange 5 is as follows: the first annular sector 51 extends under the first window 44 provided in the upper flange 4, with the front radial flange 510 located substantially below the side front radial 46 of this first window 44 and with the rear radial flange 511 located substantially below the wing 48 projecting from the rear radial side 47 of this first window 44; the second annular sector 52 extends under the second window 44 provided in the upper flange 4, with the front radial flange 520 situated substantially below the radial front side 46 of this second window 44 and with the rear radial flange 521 located substantially below the fin 48 protruding from the rear radial side 47 of this second window 44; the third annular sector 53 extends under the notch 42 of the upper flange 4, with the radial rim before 530 of the third annular sector 53 which is located substantially below the rear radial flange 41 of the upper flange 4 and with the rear radial flange 531 of the third annular sector 53 which is located at a distance from the fin 43 protruding from the radial front flange 40 of the upper flange 4, so that the rear radial rim 531 slopes open through this notch 42; - The upper flange 4 covers about half of the main notch 50, because the radial front flange 40 of the upper flange 4 is angularly offset from the radial flange before 510 of the first annular sector 51 so that the radial flange before 40 is located above this main notch 50, in other words this radial front flange 40 overhangs this main notch 50.

The foot 1 also comprises a ramp 8 projecting from the outer periphery of the body 3, disposed below the main notch 50 provided in the lower flange 5 and having a slope relative to the horizontal in a straight orientation. This ramp 8 has a lower portion 80 disposed on the side of the rear radial flange 531 of the third annular sector 53 (or rear main radial flange) of the lower flange 5, and more specifically disposed substantially below the rear radial flange 531. This ramp 8 has a upper part 81 disposed on the side of the radial flange before 510 of the first annular sector 51 (or front main radial flange) of the lower flange 5, and more precisely disposed substantially below the fin 43 projecting from the radial flange 40 before the upper flange 4. This vane 43 substantially faces the upper part 81 of the ramp 8. Thus, the main radial rim before 510 is located at a distance from the upper part 81 of the ramp 8, in other words this main radial rim before 510 is angularly offset relative to at this upper part 81 of the ramp 8. The ramp 8 thus opens into the main notch 50 which gives access to the groove 6. The process mounting or assembly of the foot 1 on the load-bearing tray 2, and more specifically in the orifice 20 formed in this plate 2 is the subject of the following description. To achieve such an assembly, three dimensions are to be respected. A first dimensioning to respect being able to engage the foot 1 in the orifice 20 of the load-bearing plate 2, is that the outer diameter DE of the cylindrical upper part 31 of the body 3 is substantially equal to the mounting clearance, or even substantially less to the inner diameter DI of the circular orifice 20. A second dimensioning to be respected in order to be able to engage the ramp 8 and then the lower flange 5 in the radial slot 21, is that the length LF of the radial slot 21 is substantially equal to the assembly clearance, or even substantially greater than the greatest width. presented by the lower flange 5 and the ramp 8, being understood by width the radial distance vis-à-vis the outer periphery of the cylindrical upper portion 31 of the body 3. This greater width corresponds in the example shown in the figures the width LB presented at the stopper 7 which protrudes from a circumferential edge of the lower flange 5.

A third dimensioning to respect in order to be able to engage the ramp 8 and then the lower flange 5 in the radial slot 21, is that the width EF of the radial slot 21 is greater than the greatest thickness presented by the lower flange 5 and the ramp 8. The mounting method of the foot 1 in the orifice 20 of the load carrying tray 2 comprises the following successive steps: Firstly, the foot 1 is engaged vertically in the orifice 20 of the load-bearing tray 2, according to a vertical movement from top to bottom while aligning the bottom 80 of the ramp 8 with the radial slot 21. In a second step, it engages the bottom 80 of the ramp 8 to 15 inside the radial slot 21. In a third time, the foot 1 is rotated about the vertical axis Z in the clockwise direction so that the right radial edge 22d of the load-bearing tray 2 is guided on the ramp 8. This rotational movement of the foot 1 combined with the descent of the ramp 8 by pressing the radial rim 20 of the plate 22d 22d leads to a global helical movement of the foot 1. During this rotational movement, the right radial edge 22d of the plate 2 reaches the top 81 of the ramp 8, then abuts against the fin 43 protruding from the radial flange front 40 of the upper flange 4. By continuing the rotational movement, the right radial edge 22d of the plate 2 flexed and eventually compresses, to finally engage inside the groove 6 of the foot 1. In a fourth step, the rotation of the foot 1 around the vertical axis Z is continued until the right radial edge 22d of the plate 2 comes into abutment against the abutment piece 71 of the stopper 7 The stopper stop 7 in the rest position thus has a stop stop function in rotation, in the clockwise direction, of the foot 1 in the orifice 20 of the load-carrying tray 2. Thus, the rotation of the foot 1 is not complete for the mounting of the foot 1. Thus, the radial edge dr 22d of the tray 2 has traveled the entire groove 6, so that a portion of the periphery of the orifice 20 of the plate 2 is blocked inside this groove 6.

With reference to FIG. 5a, if the plate 2 has a thickness E substantially equal to the height H of the groove 6, then the right radial edge 22d of the plate 2 will not be compressed and will be adjusted in the groove 6.

With reference to FIG. 5b, if the plate 2 has a thickness E greater than the height H of the groove 6, then the right radial edge 22d of the plate 2 will be compressed during the mounting of the foot 1 in order to be able to engage in the The method of disassembling the foot 1 from the opening 20 of the load carrying tray 10 comprises the following successive steps: Initially, the stop piece 71 is pressed downwards in order to bend downwards the connecting arm 70 until the abutment piece 71 is below the groove 6. In this way, it allows the rotation, in the clockwise direction, of the foot 1 in the orifice 20 2. In a second step, the foot 1 is rotated around the vertical axis Z in the clockwise direction so that the right radial edge 22d of the load-bearing tray 2 is guided on the slope of the rear radial rim 531. (or radially main back rim) of the lower flange 5. Once at the top from the slope of the rear radial flange 531, the right radial edge 22d of the plate 2 reaches the upper cylindrical rim 33 of the body 3 and out of the groove 6. In a third step, the rotation of the foot 1 is continued until disengaging completely around the orifice 20 of the plate 2 of the groove 6, to finally extract the foot 1 out of this orifice 20.

Of course the implementation example mentioned above is not limiting and other improvements and details can be made to the foot according to the invention, without departing from the scope of the invention where other shapes can be realized. 30

Claims (15)

REVENDICATIONS1. Foot (1) for transport pallet, comprising: - a body (3) of revolution extending around a vertical axis (Z) intended to be introduced inside a circular orifice (20) provided with at least one radial slot (21) formed in a plate (2) load carrier of the pallet, said radial slot (21) being delimited by a radial edge (22d) of the plate (2); - Two horizontal flanges, respectively upper (4) and lower (5), projecting radially on the outer periphery of the body (3) and defining a groove (6) adapted to receive the radial edge (22d) of the plate (2) door -charge, the lower flange (5) having at least one main notch (50) giving access to the groove (6), said main notch (50) being delimited by two main radial edges, respectively before (510) and rear (531 ); and - at least one ramp (8) protruding from the outer periphery of the body (3), arranged below the main notch (50) provided in the lower flange (5) and having a slope with respect to the horizontal in a first orientation, right or left, with a lower portion (80) disposed on the side of the rear main radial flange (531) of the lower flange (5) and a top portion (81) disposed on the side of the main radial forward flange ( 510) of the lower flange (5), said ramp (8) being intended to engage in the radial slot (21) of the orifice (20) of the tray (2) load carrier and to guide the radial edge (22d ) of said plate (2) inside the groove (6) by rotation of the foot (1) about the vertical axis (Z). 2. Foot (1) according to claim 1, wherein the body (3) of revolution is a body (3) hollow, preferably provided with a frustoconical portion (30). 3. The foot (1) according to claims 1 or 2, wherein the front main radial flange (510) of the lower flange (5) is located at a distance from the upper part (81) of the ramp (8), and said flange radial main front (510) has a slope relative to the horizontal, in the first orientation, extending downwardly outside the groove (6). A leg (1) according to any one of the preceding claims, wherein the rear main radial flange (531) of the lower flange (5) has a slope with respect to the horizontal, in the first orientation, extending towards the top inside the groove (6) on a height substantially equivalent to the height (H) of the groove (6), and wherein the upper flange (4) has a notch (42) through which the said opening main rear radial flange (531) of the lower flange (5). 5. Foot (1) according to any one of the preceding claims, comprising at least one stop (7) in rotation of the foot (1) in the hole (20) of the tray (2) load carrier, said stopper (7) comprising a substantially vertical abutment piece (71) mounted on the lower flange (5). 6. Foot (1) according to claim 5, wherein the stopper (7) comprises an elastically deformable connecting arm (70) projecting from a circumferential edge of the lower flange (5) and connecting the stop piece (71) at said circumferential edge of the lower flange (5). 7. Foot (1) according to any one of the preceding claims, wherein the upper flange (4) covers at least partly vertically the upper part (81) of the ramp (8). 8. Foot (1) according to any preceding claim, wherein the upper flange (4) has a notch (42) defined by two radial flanges, respectively before (40) and rear (41), said radial front flange (40) of the upper flange (4) being located above the main notch (50) provided in the lower flange (5) substantially in the extension of the ramp (8). 9. Leg (1) according to claim 8, wherein a fin (43) protrudes from the front radial flange (40) of the upper flange (4), said fin (43) having a slope relative to the horizontal, according to a second orientation opposite to the first orientation, extending upwardly outside the groove (6) and facing the ramp (8). 10. Foot (1) according to any one of the preceding claims, wherein the lower flange (5) comprises at least one secondary notch (54) delimited by two secondary radial flanges, respectively before (520; 530) and rear (511). 521), the radial flanges and indentations of the lower flange (5) being successively arranged in the following manner: main notch (50), front main radial flange (510), secondary rear radial flange (511; 521), secondary notch (54), front secondary radial flange (520; 530), rear main radial flange (531), main indentation (50). 11. A leg (1) according to claim 10, wherein the or each secondary radial forward edge (520; 530) has a slope with respect to the horizontal, in the first orientation, extending downwardly to the outside the groove (6), the rear radial radial rim (511; 521) being in particular horizontal. 12. The foot (1) according to claims 10 or 11, wherein the upper flange (4) has at least one window (44) extending partly above the secondary indentation (54) of the lower flange (5). ), said window (44) being delimited by a radial side (47) situated above the secondary notch (54) of the lower flange (5) and from which a fin (48) having a slope with respect to the horizontal, in a second orientation opposite to the first orientation, extending upwardly outside the groove (6). 13. The foot (1) according to any one of the preceding claims, wherein the foot (1) is made in one piece, in particular by molding a plastic material. 14. Transport pallet comprising: - a tray (2) load carrier made in particular of compressible material, such as cardboard, wherein is formed at least one orifice (20) circular provided with at least one radial slot (21) ; and - at least one foot (1) according to any one of the preceding claims, said foot (1) being fixed on the tray (2) by at least a portion of the periphery of said opening (20) of the tray ( 2) inside the groove (6) of the foot (1) between the two flanges (4, 5). 15. A method of mounting a foot (1) according to any one of claims 1 to 13 on a tray (2) transport pallet carrier in which is provided at least one orifice (20) provided with circular at least one radial slot (21) delimited by a radial edge (22d) of the plate (2), said method comprising the following steps: vertical engagement of the foot (1) in the orifice (20) of the plate (2) load carrier; - Engagement of the ramp (8) of the foot (1) within the radial slot (21) of the orifice (20) of the tray (2) load carrier; - rotation of the foot (1) around the vertical axis (Z), so that the radial edge (22d) of the tray (2) load carrier is guided on the ramp (8) to the inside of the throat (6) of the foot (1); - Continuing the rotation of the foot (1) around the vertical axis (Z) so that at least a portion of the periphery of said orifice (20) of the plate (2) is locked inside the groove (6) foot (1) between the two flanges (4, 5) .20