The present disclosure relates to refrigerated containers, such as those used as trailers or truck bodies.
U.S. Pat. No. 3,224,500 discloses a floor panel which is reinforced on its under side by a plurality of laterally spaced metallic longitudinal ribs. The floor panel is preferably made from extruded members so that the ribs are integrally formed with the top sheet. The floor panel rests upon a plurality of elongated transverse support elements. These transversely extending support elements are spaced apart longitudinally of the vehicle. The transversely extending members are in turn supported by a plurality of longitudinal stringers extending longitudinally of the vehicle body and spaced apart transversely of the body. Stringers rest upon and are supported by metallic cross beams which in turn transmit the entire weight of the cargo to the trailer longitudinal frame.
U.S. Pat. No. 4,091,743 discloses a plurality of modular units formed of ducts and horizontal load-supporting webs each forming part of a ventilating floor structure with the ducts and webs being interconnected to adjacent modular units for forming a total floor. The ducts have upwardly diverging sidewalls for strength and a duct of one modular unit is provided with a bead that forms half of a joint to be slid within a downwardly opening recess forming the other half of the joint on an adjacent web. The recess is provided with a downwardly and laterally curving guide flange so that the bead can be rolled into the recess as the modular unit having the bead is rotated into position. The interconnected ducts and webs are underlayed with foam insulation which is carried up into each web for additional insulating thickness the joint is essentially waterproof from water passing into or through the ducts.
U.S. Pat. No. 6,082,810 discloses a cargo floor construction and method of constructing same that includes a multiplicity of mounting clips that are secured to the cargo vehicle support members in laterally spaced and longitudinally aligned rows. The mounting clips are provided with a shape for mating and interlocking with the lateral edges of longitudinally extending floor planks that preferably are extruded with the mating edge shapes. Fasteners are used to secure the mounting clips to the vehicle support members but those fasteners do not pierce the floor planks. In some embodiments of the interlocking mounting clips and floor plank edges, the floor plank is elastically deformed to engage or snap onto the mounting clip to prevent lateral movement of the floor plank in either direction.
U.S. Pat. No. 7,963,410 discloses a container floor plate, in particular for a refrigerated container, with an upper floor layer, a lower floor layer and an intermediate insulating layer, support blocks being located between the upper floor layer and the lower floor layer. The purpose of the invention is to obtain a good insulation with a small mass. For this purpose, the lower floor layer is provided with several transversal supports, each support block being supported on a transversal support.
This Summary is provided to introduce a selection of concepts that are further described below in the Detailed Description. This Summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter.
In one example of the present disclosure, a floor assembly for a transportable refrigerated container is defined along a transverse direction and a longitudinal direction perpendicular to the transverse direction. The floor assembly includes a plurality of transverse stringers spaced from one another in the longitudinal direction of the floor assembly. The assembly also includes a plurality of transverse bottom flanges, each transverse bottom flange in the plurality of transverse bottom flanges being coupled to a lower portion of a respective transverse stringer in the plurality of transverse stringers and being coupled to a neighboring transverse bottom flange along respective transversely extending side edges thereof. A top flange comprising a supporting sheet is coupled to an upper portion of each transverse stringer in the plurality of transverse stringers. A plurality of longitudinal panels are supported by the supporting sheet and coupled to one another along respective longitudinally extending edges thereof to form a floor surface, each longitudinal panel in the plurality of longitudinal panels having at least one longitudinally extending rib depending substantially perpendicularly from a bottom surface thereof, the at least one rib being coupled to a top surface of the supporting sheet.
In another example of the present disclosure, a floor assembly for a transportable refrigerated container is defined along a transverse direction and a longitudinal direction perpendicular to the transverse direction. A plurality of transverse stringers are spaced from one another in the longitudinal direction of the floor assembly. The floor assembly also includes a plurality of transverse bottom flanges, each transverse bottom flange in the plurality of transverse bottom flanges being coupled to a lower portion of a respective transverse stringer in the plurality of transverse stringers and being welded to a neighboring transverse bottom flange along respective transversely extending side edges thereof. A top flange comprising a supporting sheet is coupled to an upper portion of each transverse stringer in the plurality of transverse stringers. A plurality of longitudinal panels are supported by the supporting sheet and welded to one another along respective longitudinally extending edges thereof to form a floor surface, each longitudinal panel in the plurality of longitudinal panels having a plurality of longitudinally extending ribs depending substantially perpendicularly from a bottom surface thereof, wherein a lower end of each rib in the plurality of longitudinally extending ribs is welded to a top surface of the supporting sheet.
In another example of the present disclosure, a floor assembly for a trailer is defined along a transverse direction and a longitudinal direction perpendicular to the transverse direction. The floor assembly includes a plurality of stringers that extend in the transverse direction of the floor assembly and are spaced from one another in the longitudinal direction of the floor assembly. The plurality of stringers are made of a thermally insulative material. A bottom flange is coupled to a lower portion of a respective stringer in the plurality of stringers. A top flange made of a non-thermally insulative material is coupled to an upper portion of a respective stringer in the plurality of stringers. A plurality of floor panels are provided, wherein each floor panel in the plurality of floor panels extends in the longitudinal direction, is supported by the top flange, is coupled to another floor panel along respective edges thereof that extend in the longitudinal direction, and has at least one rib that extends in the longitudinal direction and depends substantially perpendicularly from a bottom surface of the floor panel. Each floor panel is made of the second non-thermally insulative material and each at least one rib is welded to a top surface of the top flange.
According to another example of the present disclosure a floor assembly for a trailer is defined along a transverse direction and a longitudinal direction perpendicular to the transverse direction. A plurality of stringers made of a first material extend in the transverse direction of the floor assembly and are spaced from one another in the longitudinal direction of the floor assembly. A bottom flange is coupled to a lower portion of a respective stringer in the plurality of stringers. A bottom cap is associated with each respective stringer. The bottom cap extends in the transverse direction and comprises a lower channel for seating the lower portion of the respective stringer therein. The bottom cap projects from an upper surface of the bottom flange. A top flange is coupled to an upper portion of a respective stringer in the plurality of stringers, and the top flange is made of a second material that is different than the first material. A top cap is associated with each respective stringer and extends in the transverse direction and comprises an upper channel for locating the upper portion of the respective stringer therein. The top cap is one of integral with and coupled to a bottom surface of the top flange. A plurality of floor panels are provided, wherein each floor panel in the plurality of floor panels extends in the longitudinal direction, is supported by and welded to a top surface of the top flange, and is coupled to another floor panel along respective edges thereof that extend in the longitudinal direction to form a floor surface. The bottom cap and the top cap are provided as a guide for each respective stringer such that the respective stringer remains in place within the lower and upper channels and perpendicularly upright between the bottom and top flanges.
The present disclosure relates to a refrigerated container that has minimized weight, a lower center of gravity, and increased thermally efficiency in comparison to prior art containers. The present design eliminates the need for steel or aluminum cross members that are usually mounted underneath current refrigerated floors to provide load support. In the present disclosure, the addition of unique top and bottom flanges 19, 14 to a thermal spacer material (transverse stringer 12) transforms the thermal spacer material into a structural member that replaces the steel I-beam cross members used in current systems for load support.
Further, the unique design of the herein-described transverse bottom flanges 14 allows connection thereof to an outer longitudinal side rail 22 (intended for connection to a wall panel of the container) by welding. This welded connection, and the fact that the present floor assembly 10 is held together by welding wherever possible, means that the present design also has improved thermal characteristics, as it eliminates thermal shorts from mechanical fasteners that are currently used in prior art systems. These and other advantages will be described with respect to the embodiment discussed below.
A shown in
As will also be described further herein below, the transverse stringers 12 act as a thermal spacer material, and prevent heat transfer from materials below the transverse stringers 12 to materials resting on top of the transverse stringers 12, which latter materials are in contact with refrigerated air that keeps the container's cargo cool. In one example, the transverse stringers 12 are made of wood, such as for example pressure treated oak hardwood. In another example, the transverse stringers 12 are thermoplastic beam extrusions. Any material that can be cut or formed into a beam and that does not conduct heat (or does not conduct heat well), and therefore is thermally insulative, can be used to make the transverse stringers 12. Generally, in order to keep manufacturing of the transverse stringers and the parts with which they connect relatively simple, each transverse stringer 12 has the same size and shape. For example, referring to
Referring now to
Referring to
As can be seen best in
The longitudinal side rails 22 extend perpendicularly with respect to each transverse bottom flange 14 and perpendicularly to the ledge 26. The ledges 26 are therefore bounded on either lateral side by the opposite ends of the transverse stringers 12 and the opposite longitudinal side rails 22. Each ledge 26 has an open channel 27 above it, defined between the ends of the transverse stringers 12 and the inner surface of the longitudinal side rail 22, into which a side wall of the container can be inserted. The side wall would rest on the ledge 26 and would be coupled to the longitudinal side rail 22 in any manner known to those having ordinary skill in the art.
Turning now to
The top flange 19 comprises the plurality of top caps 30. Each top cap 30 in the plurality of top caps comprises an upper channel 35 for locating the upper portion 21 of a respective transverse stringer 12 therein. In the example shown, each top cap 30 is formed integrally with the supporting sheet 16 (top flange 19), such as by extruding the aluminum of the sheet. In other examples, the top caps 30 are welded or otherwise adhered to the supporting sheet 16. The top caps 30 are mirror images of the bottom caps 32, except each top cap 30 is preferably a single piece integral with or connected to the supporting sheet 16, rather than two combined halves. Thus, each top cap 30 includes two oppositely downwardly sloping portions and two reverse steps that lead to the upwardly-recessed channel 35, which is sized to fit the transverse stringer 12 therein. See also
The top and bottom caps 30, 32 are provided as guides for the transverse stringers 12 such that they remain in place between the supporting sheet 16 and the plurality of transverse bottom flanges 14 by being located in the channels 33, 35. The caps 30, 32 may be adhered to the transverse stringers 12 at adhesive joints 34. Each cap 30, 32 and channel 33, 35 is located one above the other so that the transverse stringers 12 can be held upright perpendicular to the supporting sheet 16 and the transverse bottom flanges 14. Thus, the transverse stringers 12 thermally isolate the supporting sheet 16 (which, as noted above, can be made of aluminum, which is non-thermally insulative) and the longitudinal floor panels 18 thereupon (which can also be made of aluminum) from the transverse bottom flanges 14. Refrigerated air can be provided between the ribs 20 of the longitudinal floor panels 18, thereby cooling the longitudinal floor panels 18 and the cargo in the container, with such refrigerated air being thermally isolated from the outside temperatures of the transverse bottom flanges 14.
If the longitudinal floor panels 18 that form the upper floor surface 17 are friction stir welded to one another as shown at dashed lines in
The supporting sheet 16 and attachment guides provided by top caps 30 and bottom caps 32 eliminate the deformation and eventual failure or tipping of the transverse stringers 12, which is also a problem associated with prior art structures. The transverse bottom flanges 14 with bottom caps 32 also provide the ability to weld the assembly to the longitudinal side rail 22, such as at locations E and F, which completely seals the floor assembly 10. Welding eliminates the problem of galvanic corrosion between dissimilar metals and provides an airtight, thermally efficient coupling, in contrast to bolted or riveted connections between the floor supporting members and the outside rail as shown in the prior art. Further, by eliminating the use of steel cross members underneath the floor assembly 10 for mounting purposes by instead requiring that the thermally isolating transverse stringers 12 provide structural support, this present design has a lower center of gravity, reducing the likelihood of tipping.
In the above description, certain terms have been used for brevity, clarity, and understanding. No unnecessary limitations are to be inferred therefrom beyond the requirement of the prior art because such terms are used for descriptive purposes and are intended to be broadly construed. The different assemblies described herein may be used alone or in combination with other assemblies. It is to be expected that various equivalents, alternatives and modifications are possible within the scope of the appended claims.
The present application is a continuation of U.S. application Ser. No. 14/941,096, filed Nov. 13, 2015, which claims the benefit of U.S. Provisional Application Ser. No. 62/086,265, filed Dec. 2, 2014, both of which are hereby incorporated by reference herein.
Number | Date | Country | |
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62086265 | Dec 2014 | US |
Number | Date | Country | |
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Parent | 14941096 | Nov 2015 | US |
Child | 15587848 | US |