Appliance Shipping Runner

Abstract

A blow molded runner having a bottom wall and a top wall forming a double wall blow molded configuration, at least one compressed double wall structure defined by fusion an inner surface of the bottom wall to an inner surface of the top wall. At least two columns spaced apart at a distance wherein each of the at least two columns defines one of the at least one compressed double wall structure and has a top surface and the compressed double wall structure corresponding to each of the at least two columns extends from the top surface to a bottom surface of the runner at the at least two columns wherein the bottom surface is defined by an outer surface of the bottom wall. A width of the runner varies along a length thereof.

Claims

1. A blow molded runner comprising: a bottom wall and a top wall forming a double wall blow molded configuration; at least one compressed double wall structure defined by fusion of an inner surface of the bottom wall with an inner surface of the top wall; at least two columns spaced apart at a distance wherein each of said at least two columns defines one of said at least one compressed double wall structure and has a top surface; and said compressed double wall structure corresponding to each of said at least two columns extends from the top surface to a bottom surface of the runner at the at least two columns wherein the bottom surface is defined by an outer surface of said bottom wall.

2. The runner of claim 1 further comprising a channel extending from a first to a second one of said at least two columns said channel at least as long as the distance wherein at least part of said channel defines another one of said at least one compressed double wall structures.

3. The runner of claim 1 wherein at least one of the at least two columns includes a top surface and tapered sides, the tapered sides extending outwardly in a downward direction.

4. The runner of claim 1 further comprising: a groove defined in at least one of the at least two columns and extending from the top surface towards said bottom surface.

5. The runner of claim 1 further comprising two double wall sections disposed on either side of the at least two columns such that said top surface protrudes above a second top surface of the two double wall sections.

6. The runner of claim 5 further comprising: wherein a width of said runner varies along a length thereof, said width measured between said two double wall sections.

7. The runner of claim 1 further comprising: a channel extending from said bottom wall towards said top wall and extending between said at least two columns such that a portion of said at least one compressed double wall structure adjacent to one of the columns is disposed between said channel and the one of the columns.

8. The runner of claim 1 further comprising: a cross rib disposed perpendicular to an axis defined between said at least two columns said cross rib defining a passage between first and second sides of the runner wherein the top and bottom walls of the first and second sides are disposed apart from each other to define a void in fluid communication with the passage wherein at least one of said at least one compressed double wall structure is disposed on either side of said cross rib.

9. The runner of claim 1 further comprising: a rib disposed along a lengthwise axis of the runner and positioned between the at least two columns; a portion of said rib configured as a double wall structure.

10. The runner of claim 9 further comprising: said rib including another one of said at least one compressed double wall structures on either side of the portion of said rib.

11. A blow molded runner comprising: at least two columns spaced apart at a distance measured along a length of the blow molded runner; two side walls wherein the at least two columns are located between said two side walls; a width of said runner measured between said two side walls, wherein said width varies along the length.

12. The blow molded runner of claim 11 wherein: said width varies according to a variance factor measured as a difference between a first local maximum width and a first local minimum width divided by a height of a first one of the at least two columns; the first local maximum width measured at the first one of the at least two columns; the first local minimum width measured between the at least two columns; wherein the variance factor is at least 0.05.

13. The blow molded runner of claim 12 wherein the variance factor is less than 3.

14. The blow molded runner of claim 12 further comprising: a bottom wall and a top wall; at least one compressed double wall structure defined by fusion of an inner surface of the bottom wall with an inner surface of the top wall; each of said at least two columns defines one of said at least one compressed double wall structure and has a top surface and said compressed double wall structure corresponding to each of said at least two columns extends from the top surface to a bottom surface of the runner at the at least two columns wherein the bottom surface is defined by an outer surface of said bottom wall.

15. A blow molded runner comprising: at least two columns spaced apart at a distance measured along a length of the blow molded runner; a width of said runner varying along the length, wherein said width varies according to a variance factor measured as a difference between a first local maximum width and a first local minimum width divided by a height of a first one of the at least two columns; wherein the variance factor is at least 0.05.

16. The blow molded runner of claim 15 further comprising: a bottom wall and a top wall; at least one compressed double wall structure defined by fusion of an inner surface of the bottom wall with an inner surface of the top wall; each of said at least two columns defines one of said at least one compressed double wall structure and has a top surface and said compressed double wall structure corresponding to each of said at least two columns extends from the top surface to a bottom surface of the runner at the at least two columns wherein the bottom surface is defined by an outer surface of said bottom wall.

17. The blow molded runner of claim 15 wherein: the first local maximum width is measured at the first one of the at least two columns; the first local minimum width is measured between the at least two columns;

18. The blow molded runner of claim 15 wherein the variance factor is less than 3.

19. The blow molded runner of claim 15 wherein the variance factor is in the range of 0.5 to 1.25.

20. The runner of claim 16 further comprising a channel extending from a first to a second one of said at least two columns said channel at least as long as the distance wherein at least part of said channel defines another one of said at least one compressed double wall structures.

21. The runner of claim 16 further comprising: a cross rib disposed perpendicular to an axis defined between said at least two columns said cross rib defining a passage between first and second sides of the runner wherein the top and bottom walls of the first and second sides are disposed apart from each other to define a void in fluid communication with the passage wherein at least one of said at least one compressed double wall structure is disposed on either side of said cross rib.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a perspective view of a runner according to the present invention.

[0026] FIG. 2 is perspective view of the runner of FIG. 1 installed on appliances in a warehouse.

[0027] FIG. 3 is a top detail perspective view of the runner of FIG. 1.

[0028] FIG. 4 is a bottom detail perspective view of the runner of FIG. 1.

[0029] FIG. 5 is a top detail view of the runner of FIG. 1.

[0030] FIG. 6 is a side detail view of the runner of FIG. 1.

[0031] FIG. 7 is a cross section view of the runner of FIG. 1 along section line 7-7 shown in FIG. 6.

[0032] FIG. 8 is a cross section view of the runner of FIG. 1 along section line 8-8 shown in FIG. 6.

[0033] FIG. 9 is a perspective detail view of a prior art runner.

[0034] FIG. 10 is a cross section view of the prior art runner of FIG. 9 along section line 10-10.

[0035] FIG. 11 is a perspective view of a runner according to one embodiment of the present invention.

[0036] FIG. 12 is a top view of the runner of FIG. 11

[0037] FIG. 13 is a bottom view of the runner of FIG. 11

[0038] FIG. 14 is a top detail view of the runner of FIG. 11

[0039] FIG. 15 is a bottom detail view of the runner of FIG. 11

DETAILED DESCRIPTION OF THE INVENTION

[0040] Referring now to the drawings, wherein like reference numerals designate corresponding structure throughout the views, the following examples are presented to further illustrate and explain the present invention and should not be taken as limiting in any regard. In FIG. 2, an example stack of appliances 100 is shown with runners 1 mounted to the bottom of the appliances 100. The runners 1 allow the appliances 100 to be slid along the floor of the warehouse or into packaging. On the bottom of the runners 1 there may be protrusions 30 which may reduce friction between the runner 1 and the surface the runner sits.

[0041] In FIGS. 1 and 3-8, the runner 1 is shown with four columns 2, 2, 2, 2. The outer columns 2 and 2 are shown with holes 3, 3 therein. The holes can receive bolts or other types of securing structures to secure the runner 1 to an appliance or other item. The runner 1 includes a top wall 4 with a top surface 8 and a bottom wall 6 and a bottom surface 10. The runner may be manufactured through blow molding and thus the top and bottom walls may initially be part of one parison which is heated and then expanded within the mold.

[0042] During molding the top 4 and bottom 6 walls may be joined or fused together in some locations on the runner 1 due to the temperature of the parison and pressure between the mold halves. This joining of two walls may form what is referred to as a compressed double wall structure in that inner surfaces of the top and bottom walls are in contact and may be fused together during molding. See FIG. 7 showing an example of line 70 which shows where fusion between the walls may occur.

[0043] In some locations along the runner, the top and bottom walls may remain separated to form an internal void which may be referred to as a double wall structure.

[0044] One example of a compressed double wall structure is shown with respect to the columns, for example column 2 has a top section with a top surface 14 and a bottom surface 11. The top surface is part of the top wall and the bottom surface is part of the bottom wall and the inner surfaces of the top and bottom wall in this location are joined together to form a compressed double wall structure. The compressed double wall structure extends along the sides of the column such that outside surface 40 and inside surface 42 are respectively part of the top 4 and bottom 6 walls and are joined at their inner surfaces. As can be seen the compressed double wall structure extends from the top surface 14 of the column towards the bottom surface 12 of the runner 1. Because this compressed double wall structure extends from the top surface 14 where the appliance or other item attaches and extends down to the bottom surface 12 of the runner, the possibility that buckling occurs between the top 4 and bottom 6 walls in a localized manner at the columns is reduced. The outer side of the column 2 also has series of inwardly directed grooves 44 and outwardly directed protrusions 46. These grooves 44 and protrusions 46 correspond to inside protrusions 48 and inside grooves 50. These grooves 44/50 and protrusions 46/48 provide additional buckling stiffness that resists the tendency of the compressed double wall structure to buckle due to the compression load from the weight of the appliance or item mounted to the runner 1.

[0045] Along the lengthwise direction of the runner 1, sides 24/26 are located on either side of the columns and are in a double wall configuration. These sides 24/26 provide increased rigidity in bending over the lengthwise direction of the runner 1. Extending between the columns and adjacent to the sides 24/26 are channels 18/18. These channels may have both compressed double wall sections 19 and a cross rib 20 defines a double wall section. Between channels 18/18 is a rib 22 that is a double wall section. During molding, it may be necessary for fluid pressure such as air to be directed into the cavity formed by the rib 22 and its double wall configuration. The cross rib 20 defines a passage 23 that allows fluid communication with the space 25/27 inside the sides 24/26.

[0046] When a bending load is imposed on the runner 1, the combination of the sides 24/26, channels 18/18 and rib 22 may provide increased rigidity in comparison to structure that is only double wall, for example with a rectangular cross section. Although a rectangular cross section may be stiffer in pure bending, it is possible that the cross section may collapse due to localized buckling which would cause pure bending not to exist in real world applications of the runner 1. Here, the thickness 52 of the sides 24/26 is approximately the same as the height 66. In other embodiments the thickness 52 may be up to twice as much as the height 66. However, in some applications, the overall bending stiffness of the runner 1 may be less important that the localized stiffness of the runner 1 at the column 2.

[0047] As a comparison, consider the prior art runner shown in FIG. 9. This runner includes a double wall structure (walls 1000, 1001 and walls 1000 and 1001) in the column. Therefore, when a compressive load (F) is placed on top surface 1002, the walls of the column can compress towards or away from each other. Further, there are no channels on either side of the column.

[0048] The channels on either side of Applicant's column are located relatively are located at the bottom 56 of the column which provides support across the runner 1 to prevent or at least reduce the flexing action flexing action (movement from A to B) shown in FIG. 10. Further, in bending, although the cross section shown in FIG. 9 may be of a more square configuration than the runner shown in FIGS. 1-8, localized buckling and the flexing action in the prior art runner reduces the local stiffness and can cause the a stack of appliances to tilt.

[0049] Consider compressed double wall sections 60/58 which are located at the bottom 56 of the column. Because the distance 62 is relatively small in comparison to the height 64, the possibility of sides 68 and 70 moving away from each other (similar to the flexing action of FIG. 9.) is reduced or eliminated. In one embodiment, the distance 62 is may be less than four, three or two times the height 64. The compressed double wall sections 60/58 provide tensile resistance to deformation across the width of the runner 1 when a load is placed on the column 2. The bottom of the column may further define a perimeter around the base of the column, and the compressed double wall sections may extend around 50% or more of the perimeter. In some examples, the compressed double wall sections may extend around 75% or substantially all of the perimeter.

[0050] Referring to FIG. 7, the dashed line 71 shows approximately where the top 4 and bottom 6 walls are fused together during molding. As can be seen, the compressed double wall section extends along the dashed line 70 and terminates at spaces 25/27 where a double wall section is formed and the top and bottom walls are separated. In some embodiments the compressed double wall section may have a thickness twice as much as the individual wall thicknesses of the double wall sections. In other embodiments, the mold halves may be separated less than twice the individual wall thicknesses to cause the plastic to squeeze toward the double wall sections. It is understood that the dashed line 71 represents one example of how the top 4 and bottom 6 walls fuse together, however, the molten nature of the plastic may cause this fusion line to be wavy or not perfectly centered between the thickness of the compressed double wall structure.

[0051] In FIG. 8, the passage 23 allows for fluid communication between spaces 25 and 27, which may be necessary to allow for fluid pressure introduced inside the parison to reach all necessary parts of the runner in order to control where compressed double wall structures exist and where double wall structures exist. In one example, the fluid pressure may simply be due to compressed air, however other fluids are contemplated.

[0052] Referring to FIGS. 11-15, an alternate embodiment of the runner is shown. This runner includes curved sides which may assist in increasing compressive or buckling resistance at the sidewall 1500. The runner 1 includes the columns 200, 200, 200 and 200 which include the compressed double wall structure which can be formed by fusing of the top 400 and bottom 600 walls of the blow molded runner 1 in particular locations. Rib 220 runs between the columns and allows for fluid passage therethrough during molding. Further, cross ribs 2000 ensure fluid communication between the sides as appropriate so that parts of the runner are separated double wall structures and parts are compressed double wall structures. Referring to FIG. 12, the width of the runner varies along its length, particular variations are coincident with the location of the columns. For example, the width W4 is larger than W1 and when moving from right to left as shown in FIG. 12, the width decreases to W1, increases to W2, decreases to W3 and so on. The thickness t of the side section is generally constant in the central portion of the runner 1. The resulting width variations provide for a corrugated like structure which is less susceptible to localized buckling of wall 1500, which may provide improved performance and stiffness of the runner. In addition, the varying width allows for material savings without sacrificing stiffness and strength. The overall footprint of the runner is smaller in comparison to generally rectangular runners. As can be seen, the widths W1-W4 are less than the length, but greater than the thickness and the height measured between top 1600 and bottom 1700 sections.

[0053] W4 is located at the absolute maximum width of the runner and W1 and W3 are located at a localized minimum 1202 (which may also be the absolute minimum). A localized maximum 1200 is found at width W2. The particular location pointed to at 1200 may be a small flat spot, alternately, the localized maximum may be aligned with respect to the center of a column to which it is next to (where W2 points). In some embodiments, the localized maximum 1200 may also be an absolute maximum, depending on how much the width of the runner varies along the length. The width varies between the columns according to a variance factor which is calculated as the difference between localized minimum and maximum widths divided by the height (h1) of the column.

[0054] The runner of FIGS. 11-15 also includes protrusions 30 which enable the runner to more easily slide when an item such as an appliance is mounted on top thereof.

[0055] In some cases, the difference between the width at the first local minimum 1202 and the first local maximum 1200 is less than a thickness (t) of the side sections of the runner. In some aspects, the difference is less than a height (h2) of the side sections of the runner between two of the columns.

[0056] In one preferred embodiment, W1 and W3 are 4.8 cm, W2 is 7.8 cm, and W4 is 10.5 cm, t is 0.7 cm, h is 4 cm and L is 88 cm. Thus in this embodiment, the variance factor is about 0.75. In other preferred embodiments, the variance factor is in the range of 0.5 to 1.25.

[0057] Although the invention has been described with reference to a particular arrangement of parts, features and the like, these are not intended to exhaust all possible arrangements or features, and indeed many other modifications and variations will be ascertainable to those of skill in the art.