A ROLLER CONTAINER

Abstract: A roller container with mutually pivotable side members (2, 3) and a base plate (4) foldably journalled between the side members has a pair of projections (13, 14) on the underside of the base plate to co-operate with projections (15, 16) on an associated side member in order to slow down the drop of the base plate from a vertical to a horizontal position. This obviates overloading of the hinges (10, 11) of the base plate, which are moreover relieved in that the projections (13, 14) engage the wheel brackets (7, 8) when the base plate (4) is in a horizontal position of use.

Description: .A ROLLER CONTAINER The invention concerns a roller container of the type comprising a base plate which is foldably or tiltably journalled between a pair of opposite side members, which are mutually pivotable between a storage position in which the container with folded-up base plate and diverging side members can receive an adjacent container of the same type, and a position of use in which the base plate is substantially horizontal and prevents pivoting of the side members. Such containers are greatly used for the transport of food products, and when the containers are empty they are to be stored and should therefore take up as little space as possible; consequently, it is expedient that the base plate may be folded up and the side members may be pivoted a little apart from each other so that a whole row of containers may be pushed into each other just like shopping carts. It is moreover known that the base plate is provided with a locking mechanism ensuring that the base plate falls down when the locking mechanism is released. The base plate will then fall down and hit some stops defining its position of use with a hard blow. This causes much noise and a great load on both the base plate and its hinges so that the dimensions of the latter parts must be very sturdy to withstand this impact. The object of the invention is to provide a roller contamer' of the present type and with means causing soft brakening of the drop of the base plate toward the horizontal position, resulting in a lighter and cheaper con struction of the roller container. This object is achieved In that at least one side mewr ber has a first, inwardly extending projection extending transversely to the plane of the side member and having an edge disposed below the base plate to cooperate with an- edge on a second projection extending from the underside of the base plate, said projections being po positioned relatively closely to the pivot axis of the pivoting movement of both the base plate and the side members so that the said edges cooperate to transform a moment of motion of the base plate to a moment for pivoting the side member toward its position of use when the base plate forms an acute angle with the horizontal plane. Then the projections on the underside of the base plate hit the projections on the side members when the base plate approaches the horizontal position so that -the moment of motion of the base plate is transformed to a movement of the side members from the storage position towards the position of use, as the projections on the base plate act on the projections of the side member in such a direction that the side member is pulled toward the position of use. Thus, the projections of the side members act as resilient engagements for the projections of the base plate, causing the movement of the base plate to be gradually slowed down. This effect can thus be achieved by very simple means, but of course there are limits to how the said projections may be positioned in relation to each other in order for them to operate as desired in practice, i.e. the edge of the base plate projections in the preferred embodiment hit a cooperating edge of the side member projection facing away from the base plate hinge when the projections cooperate with each other. The operation is ensured by locating the cooperating projections relatively closely to the hinges of the base plate as well as the side member. When the said edge on the projection of the base plate forms an obtuse angle with the base plate, as measured in a direction away from the projection, the projec tions cooperate over a greater travel of the base plate, implying that the projections of the side members may be extended or spaced more from the hinges which results in an increase in the torque which urges the side members in a direction toward their position of use. According to the invention, the base plate has a projection opposite each wheel bracket and so positioned and shaped that the end of the projection which faces away from the base plate in the position of use transmits vertical loads on the base plate to the wheel brackets so that the load on the base plate is transwitted directly to the wheel brackets in the position of use, permitting further reduction in the strength requirements of the base plate hinges., According to The invention, the projections of the side members extend over the wheel brackets in spaced relationship therewith, and the projections have downwardly extending supports to support the projections on the wheel brackets. This ensures that these projections cannot be bent downwardly if, as an exception, the base plate projections hit the top of the side member projections. Moreover, the cooperation between the projections of the base plate and the side members result in a downwardly directed component of force on the projections of the side members, and this load, too, can be supported by the wheel brackets through the said downwardly directed supports. The invention will be explained more fully by the following description of an embodiment with reference to the drawing, in which fig. 1 is a perspective view of an embodiment of the roller container of the invention, figs. 2A and 2B are schematic views of some details in the preferred embodiment, while fig. 3 is a schematic view of another embodiment of the invention. The roller container shown in fig. 1 comprises a rear member 1, a pair of side members 2, 3 and a base plate 4. Usually the container also comprises a foldable front member,preferably by way of one or two gates (not shown). The side members 2, 3 are hinged tQ the rear member 1 so as to be pivotable between the position shown in the figure, called storage position, and a po sition in which the side members are mutually parallel, called the position of use. The lower edge of each of the side members has attached to it brackets 5 and 6 for driving wheels, which are preferably rotatable about a vertical axis. The two other driving wheels are carried by brackets 7 and 8 which are interconnected by means of a-cross member 9 (see fig. 2A where the rear members and the side members are removed). The base plate 4is pivotally connected to the cross member by hinges 10 and 11; moreover there is provided a drop bolt 12 known per se which is arranged to retain the base plate 4 in a vertical position in cooperation with the rear member 1, and which can be released so that the base-plate falls down to the horizontal po sition. The means of the invention will first be discussed with reference to fig. 1, and the operation will then be described more fully with reference to figs. 2A and B, which schematically show the parts of fig. 1 which are necessary to understand the invention. The base plate 4 has a pair of projections 13 and 14 in the vicinity of the hinges1 and these projections are arranged to cooperate with inwardly extending projections 15 and 16, respectively, which are secured to the side members 2 and 3. The base plate has moreover a pair of additional projections 17, 18 which are arranged to cooperate with the wheel brackets 5,6, each of which having a stop block 19, 20 as known in the art. The stop blocks are so mounted as to prevent, in cooperation with the projections 17 and 18, the side members 2, 3 from being pivoted away from their mutually parallel position when the base plate 4 is horizontal. In other words, the base plate has to be lifted sufficiently for the projections 17 and 18 to clear the stop blocks 19 and 20 in order that the side members may be pivoted to the side. When the drop bolt 12 is released the base plate 4 drops from the vertical to the horizontal position, and when the base plate is in the inclined position shown in fig. 2A, an edge 21 of the projection 13 hits the inwardly extending projection 15 (the same effect occurs between the projections 14 and 16). The moment of motion which the base plate 4 has obtained around its hinges by the drop from the vertical position is then transformed to a pressure on the projection 15 (to the right in fig. 2A), which causes the side member 2 to pivot a distance toward the position of use. Thus, the projection 15 yields to the action of the projection 13 causing limited loading of the hinges 10, 11. In addition to being urged to the right in fig. 2A, the projection 15 is also urged slightly downwardly, and this load is received by a support in form of a downwardly bent end flange 22 which engages the wheel bracket 7. It will be appreciated that if the side member should exceptionally be pivoted too far away from the position of use, the projection 13 may hit the top side of the inwardly extending projection 15, and in that case the end flange 22 ensures that the projection 15 will not be bent. However, the side members are provided with means known per se to define their extreme positions so that the latter situation can only occur in case of overloading. Fig. 2B shows moreover how the base plate 4 engages the wheel bracket 5 in the position of use; it appears that the stop block 19, as previously explained, engages the internal end of the projection 17 so that the side member cannot be pivoted away from the position of use before the base plate 4 has been lifted so much that the projection 17 clears the stop block 19. When the driving wheels are in the position shown in the drawing, the torque on the side members 2,3, as caused by the drop of the base plate, may be sufficient for the side members to be pivoted right into their position of use, but if the driving wheels are pivoted 0 through 90 , the side members cannot normally be moved right into their position of use. It is therefore important that the projections 17, 18 have a relatively great extent measured in parallel with the hinge side of the base plate so that just slight pivoting of the side members away from the storage position is suffi cient for the projections 17, 18 to engage the stop blocks 19, 20, so that the mechanism around the hinge side and the base plate is not overloaded if a user steps on the base plate. It is evident that there are certain limits to the mutual position of the projections 13, 15 (and 14, 16), which is due to the length of the projections 15, 16 and the angle between the side members in the storage position. The projections 13, 15 may cooperate, ow- ever, over a greater travel of the base plate if the edge 21 forms an obtuse angle with the base plate 4, as indicated by the broken line in fig. 2A. With respect to theprior art the means described involve a considerable reduction in the hinge load and since the projections 13 and 14 are dimensioned to engage the respective wheel brackets 7 and 8 in the position of use,the hinge is not loaded by the goods in the container either. Thus a construction which is reliable in operation and protected against overloading is provided by very simple means. The preferred embodiment has been described in the foregoing, but, within the scope of the invention, the cooperating projections may also be positioned in another manner to provide the effect of the invention. Such other positioning appears from fig. 3, which schematically shows the cooperating parts which are sufficient to understand-the operation regard being had to the foregoing description. Fig. 3 shows a base plate 24 in a position corresponding to fig 2A, where the projections do not yet cpoperate. The projections in fig. 3 comprise an inwardly exending projection 26 attached to the side member 23 as well as a projection 27 protruding from the underside of the base plate 23 (it will be appreciated that similar projections may be provided to the left in fig. 31. As shown in fig. 3, the projection 26 may be U-shaped and is arranged to receive the projection 27 when the base plate has been pivoted a little further downwardly around its hinges 25. The free end of the projection 27 can just extend into the'U-shaped strap so that the edge 28 of the projection 27 engages the bottom of the U. When the base plate 24 is moved downwardly toward its horizontal position, the edge 28, due to its inclination, will affect the strap 26 so that the strap is moved to the position shown in broken lines, pulling the side member 23 toward the position of use, previously mentioned, which provided the effects described in the foregoing. It is evident that the embodiment explained in connection with fig. 3 can additionally be combined with the means previously described to support the side member projections and to support the base plate in the po position of use, and it will also be appreciated that the projection may be formed so as to cooperate in accordance with a combination of the engagements explained in connection with both of the described em bodXments.

Claims: P a t e n t c 1 a i m 1. A roller container of the type comprising a base plate which is foldably or tiltably journalled between a pair of opposite side members, which are mutually pivotable between a storage position in which the container with folded-up-base plate and diverging side members can receive an adjacent container of the same type, and a position of use in which the base plate is substantially horizontal and prevents pivoting of the side members, c h a r a c t e r i z e d in that at least one side member (2,3) has a first, inwardly extending projection (15,16) extending transversely to the plane of the side member and having an edge disposed below the base plate to cooperate with an edge (21) on a second projection (13, 14) extending from the underside of the base plate (4), said projections being positioned relatively closely to the pivot axis of the pivoting movement of both the base plate (4) and the side members (2, 3) so that the said edges cooperate to transform a moment of motion of the base plate to a moment for pivoting the side member toward its position of use when the base plate (4) forms an acute angle with the horizontal plane. 2. A roller container according to claim 1, c h a r a c t e r i z e d in that the said edge (21) on the projection (13, 14) of the base plate forms an obtuse angle with the base plate, as measured in a direction away from the projection (13, 14). 3. A roller container according to claim 1 or 2, in which the base plate is hinged to a cross member connecting a pair of wheel brackets, c h a r a c t e r i z e d in that the base plate (4) has a projection (13 and 14) opposite each wheel bracket (7, 8) and so positioned and shaped that the end of the projection which faces away from the base plate in the position of use transmits vertical loads on the base plate (4) to the wheel brackets (7, 8), 4, A roller container according to claim 3, c h a r a c t e r i z e d in that the projections (15, 161 of the side members extend over the wheel brackets (7, 82 in spaced relationship therewith, and that the projections (l', 16) have downwardly extending supports (22) to support the projections (15, 162 on the wheel brackets (7, 8).

Inventors: NESTING, ERIK MARKVARD GRUBBE
Applicants: VARIANTSYSTEMET A/S
Application year: 1983
Main classification: B62B3
IPC codes: B62B3