US20080202056A1 - Lightweight low profile floor structure - Google Patents
Lightweight low profile floor structure Download PDFInfo
- Publication number
- US20080202056A1 US20080202056A1 US11/526,186 US52618606A US2008202056A1 US 20080202056 A1 US20080202056 A1 US 20080202056A1 US 52618606 A US52618606 A US 52618606A US 2008202056 A1 US2008202056 A1 US 2008202056A1
- Authority
- US
- United States
- Prior art keywords
- floor structure
- extending
- structure according
- spaced
- moment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/008—Doors for containers, e.g. ISO-containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/20—Floors or bottom sub-units
- B62D25/2054—Load carrying floors for commercial vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/52—Large containers collapsible, i.e. with walls hinged together or detachably connected
- B65D88/522—Large containers collapsible, i.e. with walls hinged together or detachably connected all side walls hingedly connected to each other or to another component of the container
Definitions
- FIG. 2 shows a free body diagram of this beam.
Abstract
Longitudinal beams span between torque boxes located at each end. The beams attach to the torque boxes to prevent vertical movement or rotation about their horizontal axis, or a fixed end condition. The longitudinal beams cover the width of a platform used to support pallets, and the ends may have wheels for transport of the pallets. The torque box attaches to a moment beam to prevent rotation between the two members about the lateral axis. The torque box has a high strength to transmit all of the moment generated by the end condition through it and into the moment beam. This fixed end condition has the advantages of light weight, low deflection, and low beam depth.
Description
- Often in the structural design of a floor structure, or any horizontal surface that requires the ability to sustain vertical loading, it is desirable to maintain a minimum structural thickness. It is also desirable to maintain a low weight for cost and other reasons. These two factors are particularly desirable for transport containers.
- While the present invention has numerous applications, a preferred embodiment is for transport of small containers, for example as described in James Lawrence et al U.S. Pat. No. 6,599,082, incorporated into the present application by this reference, floor of which is designed to carry conventional pallets. Another application is for building construction, in which a floor or roof structure is designed of Reinforced concrete or steel. Greater spans may be achieved because of the reduced stress and deflection inherent in this design.
- It is well known that beams with fixed ends deflect less, and have lower stresses than simply supported beams when both beams have the same span and loads. A fixed end condition is typically accomplished in common floor structures by using a single beam over multiple spans or in space frames using moment carrying joints. However, for a platform supported on each end, these are not possible. The present invention spans the distance between end supports without the use of simple beams.
-
FIG. 1 is a perspective view of a floor structure comprised of longitudinal beams, a, a torque box b, and a moment beam c; and, -
FIG. 2 shows a free body diagram of this beam. - A set of longitudinal beams which span between torque boxes located at each end, are attached to the torque box in such a way as to prevent vertical movement or rotation about their horizontal (lateral) axis, known in the trade as fixed end condition. Enough longitudinal beams are provided to cover the width of the platform. This platform may be used to support pallets, for example, and the ends may be supported by wheels for easy transport of lading contained on the pallets.
- The torque box b is attached to moment beam c in such a way as to prevent rotation between the two members about the lateral axis. The torque box is designed to have a high enough strength to transmit all of the moment generated by the end condition at the end of the longitudinal beam a through the torque box b and into the moment beam c, thereby providing a fixed end condition with the aforementioned structural advantages of light weight and low deflection, while maintaining a low beam depth.
- These features are of particular importance for the above mentioned platform to support and transport pallets because of height and weight limitations.
- Concerning member sizing and optimization, the relative cross sectional geometric properties of each member of the structure can be calculated to achieve an optimal design.
- To determine the properties of the moment beam, first determine the degree of fixity that will result in the lowest maximum stress along the longitudinal beams.
FIG. 2 shows a free body diagram of this beam. Because of the constraint of the torque box and moment beam, moment Ma is produced, which acts in the same direction Mb, at beam center, and helps to reduce Mb, thus lowering the bending stress. The critical stress occurs at the location with the highest moment, assuming a beam of uniform cross section, and the sum of these two moments must equal the moment induced by the vertical forces, in this case W*L/8. If both moments are equal, the critical stress (moment) occurs in both places, and is a minimum. Then Ma=Mb=W*L/16. The stiffness of the supporting joint at “A” can be calculated to produce this moment.
Claims (9)
1. A floor structure comprising:
a plurality of longitudinally extending beams;
at least a pair of longitudinally spaced, and transversely spaced torque boxes;
at least one moment beam vertically spaced from said torque boxes, and extending between said transversely spaced torque boxes; and
attachment means attaching said moment beam to said torque boxes.
2. A floor structure according to claim 1 wherein said attachment means comprise plates extending longitudinally and vertically between said moment beam and said transversely spaced torque boxes.
3. A floor structure according to claim 1 comprising a plurality of longitudinally spaced transversely extending supports extending between said longitudinal beams.
4. A floor structure according to claim 3 including a plurality of vertically extending, laterally spaced vertical supports attached to the outermost of said longitudinal beams.
5. A floor structure according to claim 4 including a plurality of vertically extending, laterally spaced, vertical supports attached to the outermost of said longitudinal beams.
6. A floor structure according to claim 5 including a plurality of vertically extending, laterally spaced, vertical supports attached to the outermost of said longitudinal beams.
7. A floor structure according to claim 6 including a plurality of transversely extending, longitudinally spaced upper supports attached to the upper portion of said vertical supports.
8. A floor structure according to claim 6 wherein said upper supports include means for interconnecting opposite ones of said upper transversely extending supports.
9. A floor structure according to claim 8 wherein said upper vertically extending and transversely extending supports are retractable.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/526,186 US20080202056A1 (en) | 2006-01-30 | 2006-09-25 | Lightweight low profile floor structure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US76319506P | 2006-01-30 | 2006-01-30 | |
US11/526,186 US20080202056A1 (en) | 2006-01-30 | 2006-09-25 | Lightweight low profile floor structure |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080202056A1 true US20080202056A1 (en) | 2008-08-28 |
Family
ID=39714335
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/526,186 Abandoned US20080202056A1 (en) | 2006-01-30 | 2006-09-25 | Lightweight low profile floor structure |
Country Status (1)
Country | Link |
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US (1) | US20080202056A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9062485B2 (en) | 2009-07-07 | 2015-06-23 | Michael John Guidos | Articulating roller arm assembly |
US9492037B2 (en) | 2009-10-23 | 2016-11-15 | Christopher M. Kee | Hybrid enclosure system |
US9622623B2 (en) | 2011-07-19 | 2017-04-18 | Christopher Marshal KEE | Enclosure systems |
US10030421B2 (en) | 2014-02-12 | 2018-07-24 | Kls Doors, Llc | Latch and lock system |
US11618506B1 (en) * | 2022-08-10 | 2023-04-04 | Richard Leslie Williamson | Trailer floor panel |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2710160A (en) * | 1948-05-14 | 1955-06-07 | Union Steel Prod Co | Material handling pallets |
US3207096A (en) * | 1963-11-26 | 1965-09-21 | Moraine Box Company | Pallet structure |
US3405665A (en) * | 1966-06-16 | 1968-10-15 | David M. Slonim | Shipping pallet |
US4662532A (en) * | 1985-11-04 | 1987-05-05 | Steel King Industries, Inc. | Foldable container |
US5669507A (en) * | 1996-04-17 | 1997-09-23 | Pruitt, Jr.; John F. | Pallet box container |
US6599082B2 (en) * | 2001-05-17 | 2003-07-29 | James Lawrence | Intermodal transport system for freight |
US6651398B2 (en) * | 1999-07-19 | 2003-11-25 | Composite Wood Specialties Ltd. | Decking assembly and decking kit with hold-down clip |
-
2006
- 2006-09-25 US US11/526,186 patent/US20080202056A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2710160A (en) * | 1948-05-14 | 1955-06-07 | Union Steel Prod Co | Material handling pallets |
US3207096A (en) * | 1963-11-26 | 1965-09-21 | Moraine Box Company | Pallet structure |
US3405665A (en) * | 1966-06-16 | 1968-10-15 | David M. Slonim | Shipping pallet |
US4662532A (en) * | 1985-11-04 | 1987-05-05 | Steel King Industries, Inc. | Foldable container |
US5669507A (en) * | 1996-04-17 | 1997-09-23 | Pruitt, Jr.; John F. | Pallet box container |
US6651398B2 (en) * | 1999-07-19 | 2003-11-25 | Composite Wood Specialties Ltd. | Decking assembly and decking kit with hold-down clip |
US6599082B2 (en) * | 2001-05-17 | 2003-07-29 | James Lawrence | Intermodal transport system for freight |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9062485B2 (en) | 2009-07-07 | 2015-06-23 | Michael John Guidos | Articulating roller arm assembly |
US9492037B2 (en) | 2009-10-23 | 2016-11-15 | Christopher M. Kee | Hybrid enclosure system |
US9622623B2 (en) | 2011-07-19 | 2017-04-18 | Christopher Marshal KEE | Enclosure systems |
US10030421B2 (en) | 2014-02-12 | 2018-07-24 | Kls Doors, Llc | Latch and lock system |
US11618506B1 (en) * | 2022-08-10 | 2023-04-04 | Richard Leslie Williamson | Trailer floor panel |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |