FIELD OF THE DISCLOSURE
The present disclosure relates to wheeled carts. More specifically, the present disclosure is concerned with a wheeled cart and a method of manufacturing thereof.
BACKGROUND OF THE DISCLOSURE
A wheeled cart typically comprises a hollow body supported on the ground by a pair of wheels, connected to the body by a wheel mounting portion near a bottom end thereof.
As shown in FIGS. 1 and 2 for example, the mounting portion 22 comprises facing ribs 24, 26 extending generally perpendicular from the rear wall 14 of the cart body 12 on a first side (right hand side in FIGS. 1 and 2 for example) of the rear wall 14 of the cart body 12, and facing ribs 28, 30 extending generally perpendicular from the rear wall 14 of the cart body 12 on a second side of the rear wall 14 (see left hand side in FIGS. 1 and 2 for example) of the cart body 12. The ribs are reinforced by a wall 32a, 32b generally parallel to the rear wall 14 of the cart body 12 and joining the facing ribs 24, 26 and 28, 30 together. Each rib comprises at least one axle bore 20 at a distance d from the rear wall 14 of the cart body 12 and at a height h from a bottom edge of the rear wall 14 of the cart body 12 so that the axle bores of the ribs 24, 26 and 28, 30 are aligned along a generally horizontal direction, i.e. parallel to the bottom edge 40 of the cart, so as to receive an axle (not shown) that mounts wheels (not shown) to the cart body 12 on each side thereof.
FIG. 2 shows ribs 24, 26 and 28, 30 each comprising three axle bores 20, each at different distances from the rear wall 14 of the cart body 12 and at different heights from the bottom edge 40 of the rear wall 14 of the cart body 12, thereby allowing accommodating three different wheel diameters.
There is a need in the art for a wheeled cart and a method of fabrication thereof.
SUMMARY OF THE INVENTION
More specifically, in accordance with the present disclosure, there is provided a wheeled cart comprising a body supported by at least one wheel connected to the body by at least one sleeve, the at least one sleeve extending on at least part of a width of a wall of the body, the at least one sleeve supporting a wheel axle on a length of the at least one sleeve on the at least part of the width of the wall, the wheel axle mounting said at least one wheel.
There is further provided a method for making a wheeled cart, the method comprising molding at least one sleeve integrally on at least part of a width of a wall of a body; supporting a wheel axle on a length of the at least one sleeve on the at least part of the width of the wall; and mounting at least one wheel to the axle.
Other objects, advantages and features of the present disclosure will become more apparent upon reading of the following non-restrictive description of specific embodiments thereof, given by way of example only with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the appended drawings:
FIG. 1 shows a mounting portion of a wheeled cart as known in the art;
FIG. 2 shows a mounting portion of a wheeled cart as known in the art;
FIG. 3 shows a mounting portion of a wheeled cart according to an embodiment of an aspect of the present disclosure;
FIG. 4 shows a mounting portion of a wheeled cart according to an embodiment of an aspect of the present disclosure;
FIG. 5 shows a mounting portion of a wheeled cart according to an embodiment of an aspect of the present disclosure;
FIG. 6 shows the inside of a wheeled cart according to an embodiment of an aspect of the present disclosure; and
FIG. 7 shows a curb test standard.
DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
The present disclosure is illustrated in further details by the following non-limiting examples.
A cart according to an embodiment of an aspect of the present disclosure is shown in FIGS. 3 to 6 for example.
A shown in FIGS. 3 to 5, the rear wall 14 of the cart body 12 comprises at least one sleeve 60.
The sleeve extends on at least part of a width of a wall, typically the real wall 14 of the body, i.e. on at least part of a length of the rear wall 14 between one lateral edge 41 of the rear wall 14 and the opposite lateral edge 43 of the rear wall 14, the sleeve being generally parallel to the bottom edge 40 of the cart, thereby supporting the wheel axle (X) on the length of the sleeve.
It may be contemplated using a single wheel, generally supported in the middle of the real wall 14 between the lateral edge 41 and the opposite lateral edge 43 of the rear wall 14 of the body for example.
In FIG. 3, a first sleeve 60a of a length la is shown on the left-hand side of the rear wall 14, i.e. near the lateral edge 41 of the rear wall 14, and a second sleeve 60b of a length lb is shown on the right-hand side of the rear wall 14 (as seen from the rear oft the cart). The first sleeve 60a and the second sleeve 60b are aligned, i.e. they are on a same line with respect to the bottom edge 40 of the cart for supporting an axle therethrough, the axle supporting a side wheel 18 on each free end thereof for example. Typically, the first sleeve 60a and the second sleeve 60b are aligned generally parallelly to the bottom edge 40 of the cart, i.e. on a same line generally parallel to the bottom edge 40 of the cart, for supporting wheels of a same diameter. In FIGS. 4 and 5, multiple sleeves, i.e. positioned at different heights from the bottom edge 40 of the cart body, are shown for multiple wheel diameters.
FIG. 4 shows an example with two sleeves 60, 62, thus allowing accommodating two wheel diameters, each one of the two sleeves 60, 62 being discontinued, with sleeve portions 60a, 62a and 60b, 62b near each edge 41 and 43 respectively of the rear wall 14, each sleeve 60, 62 at a height from the bottom edge of the cart for supporting the wheel axle (not shown) of wheels (not shown) of a corresponding diameter on a length la, lb thereof on each side of the rear wall 14 respectively, depending on the size of the cart, the diameter of the wheel axle and the thickness of the walls of the sleeves and of the rear wall 14. Depending on the use of the cart and of the nature of the content it is intended to receive, i.e. on the weight the container may reach when used to its full inside capacity, the size of the sleeves may be varied. Also, a single sleeve generally centered on the rear wall 14 and aligned the bottom the bottom edge 40 of the cart, may be used.
In FIG. 5, each one of three sleeves 70, 72 and 74 at different heights from the bottom edge of the cart is discontinued, i.e. with sleeve portions 70a, 72a, 74a and 70b, 72b and 74b on each side respectively of the rear wall 14, each sleeve 70, 72 and 74 adapted for supporting the wheel axle (not shown) of wheels (not shown) of a corresponding diameter, for example 12″, 10″ and 8″ as shown, on a length la, lb thereof on each side of the rear wall 14 respectively, for example on at least on 20 mm, for example on about 50 mm, depending on the size of the cart, the diameter of the wheel axle and the thickness of the walls of the sleeves and of the rear wall 14, as well as the use of the cart.
As best seen in FIG. 6 showing the inside of the cart of FIG. 3, the sleeves form part of the rear wall 14 of the cart, i.e. they are integrally molded with the wall of the body of the cart.
According to an aspect of an embodiment of a method of the present disclosure, the rear wall 14 is injected molded, at least one metallic rod being placed in the mold part of the rear wall before, during or after closing the mold before injection, and then removed before opening of the mold, thereby forming a sleeve. Positioning the rod or rods prior to mold closing may be selected to save cycle time.
A number of comparative mechanical resistance tests were made, on carts as known in the art as illustrated for example in FIGS. 1 and 2, and on carts of the present disclosure as illustrated for example in FIG. 5.
In the case of the carts as known in the art as illustrated for example in FIGS. 1 and 2, as the rear wall 14 of the container deforms outwards under the pressure of the content of the container during impact tests shearing occur between the rear wall 14 and the rigid ribs 24, 26, 28 and 30 at the foot of the ribs 24, 26, 28 and 30, the rear wall 14 tears off at the foot of the ribs 24, 26, 28 and 30. In contrast, in the case of the carts of the present disclosure as illustrated for example in FIG. 5 for example, no tearing or permanent deformation occurs, as the rear wall 14 and the sleeve portions thereon flexibly accommodate the outward deformation.
A test is used to determine if handles, wheels and axles of a cart can withstand repeated pulling forced over the cart rated service life (see FIG. 7). After the test, the axle bores 20 of the carts as illustrated for example in FIGS. 1 and 2, initially circular, were deformed into ovoid, whereas in the case of the carts as illustrated for example in FIG. 5 for example, when using the middle sleeves 72b and 72a, i.e. 10″ wheels, no deformation could be seen as a result of the test.
The disclosed mounting portion comprising sleeves providing a surface supporting the wheel axle, while the cart bottom, i.e. the body part below the mounting portion down to the bottom edge of the cart, has a smooth surface free of ribs or walls that would rigidify the cart bottom thereby weakening the cart bottom in terms of impact especially at low temperatures. The present cart bottom is thus resistant to impacts.
The scope of the claims should not be limited by the embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole.
Patent Application
20180304911
