US20020140247A1 - Bedliner with anti-slip under layer - Google Patents
Bedliner with anti-slip under layer Download PDFInfo
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- US20020140247A1 US20020140247A1 US10/155,438 US15543802A US2002140247A1 US 20020140247 A1 US20020140247 A1 US 20020140247A1 US 15543802 A US15543802 A US 15543802A US 2002140247 A1 US2002140247 A1 US 2002140247A1
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- Prior art keywords
- liner
- under layer
- base sheet
- density polyethylene
- layer
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- 239000000463 material Substances 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims description 21
- 229920006178 high molecular weight high density polyethylene Polymers 0.000 claims description 14
- 229920003023 plastic Polymers 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 14
- 229920000098 polyolefin Polymers 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 239000004708 Very-low-density polyethylene Substances 0.000 claims description 9
- 229920001866 very low density polyethylene Polymers 0.000 claims description 9
- 238000007666 vacuum forming Methods 0.000 claims description 8
- 229920000642 polymer Polymers 0.000 claims description 5
- -1 polyethylene Polymers 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 150000004657 carbamic acid derivatives Chemical class 0.000 claims description 2
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- 229920001577 copolymer Polymers 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000012948 isocyanate Substances 0.000 claims description 2
- 150000002513 isocyanates Chemical class 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 150000003672 ureas Chemical class 0.000 claims description 2
- 239000005062 Polybutadiene Substances 0.000 claims 1
- 239000004698 Polyethylene Substances 0.000 claims 1
- 229920002857 polybutadiene Polymers 0.000 claims 1
- 229920001748 polybutylene Polymers 0.000 claims 1
- 229920000573 polyethylene Polymers 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 229920001903 high density polyethylene Polymers 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 7
- 239000004700 high-density polyethylene Substances 0.000 description 6
- 239000003973 paint Substances 0.000 description 5
- 229920002725 thermoplastic elastomer Polymers 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 239000002991 molded plastic Substances 0.000 description 3
- 229920002633 Kraton (polymer) Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
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- 238000005260 corrosion Methods 0.000 description 2
- 239000002052 molecular layer Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 229920003031 santoprene Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
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- 239000004609 Impact Modifier Substances 0.000 description 1
- 229920000426 Microplastic Polymers 0.000 description 1
- 229920010346 Very Low Density Polyethylene (VLDPE) Polymers 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 231100001010 corrosive Toxicity 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- DERLTVRRWCJVCP-UHFFFAOYSA-N ethene;ethyl acetate Chemical compound C=C.CCOC(C)=O DERLTVRRWCJVCP-UHFFFAOYSA-N 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
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- 238000009966 trimming Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/01—Liners for load platforms or load compartments
Definitions
- This invention relates to molded plastic protective liners for pickup truck cargo beds, and in particular to liners with a non-skid undersurface that protects truck beds from damage due to rubbing by the liner.
- Pickup trucks have been used for many years as working vehicles. In recent years pickup trucks have become increasingly popular as family transportation vehicles, because of their dual ability to haul passengers and cargo.
- the cargo bed surfaces of pickup trucks are generally finished with paint by the manufacturer. If the painted surfaces are unprotected, they can be scratched from cargo impact or deteriorated by weather or corrosives, seriously detracting from the value of the trucks. Whether a pickup truck is used as a working vehicle or as a family transportation vehicle, it is important to keep the surface of the cargo bed in a satisfactory condition.
- truck cargo bed liners having anti-slip upper surface for restraining cargo during transport, loading, and unloading.
- the anti-slip surfaces comprise a layer having a higher co-efficient of friction than the plastic forming the liner.
- the non-slip layer may be coextruded with, adhered to, or thermally attached to the plastic base material before or during the liner vacuum forming process.
- the present invention is a protective truck bed liner adapted to reduce rubbing between the liner and the truck bed.
- the liner includes an anti-slip under layer preferably made of a plastic material that is either coextruded with or otherwise adhered to a base sheet of plastic used to vacuum form the liner.
- the under layer has a coefficient of friction high enough to reduce rubbing and thereby protect the truck cargo bed by reducing damage due to the installation of the liner.
- the under layer can be a composition including very low density polyethylene and very high molecular weight high density polyethylene which can be in portions of about sixty percent and forty percent, respectively.
- the under layer may be a composition including a polyolefin and the polyolefin may be between thirty and fifty percent of the composition and is preferably about forty percent of the composition.
- the under layer can be as thin as a single molecular layer of anti-skid material and is preferably at least ten thousandths of an inch thick.
- the under layer can be uniform thickness or selectively applied to specific areas of the liner to protect cargo bed components that are more susceptible to wear.
- an upper anti-slip layer can be used and it can be of the same composition as the under layer.
- the upper layer can be as thin as a single molecular layer of anti-skid material and is preferably at least approximately forty thousandths of an inch thick.
- FIG. 1 is a perspective view of a cargo bed liner of the present invention installed in a pickup truck.
- FIG. 2 is a fragmentary sectional view taken substantially along line 2 - 2 of FIG. 1.
- FIG. 3 is a fragmentary sectional view of a cargo bed base sheet sandwiched by anti-slip layers.
- FIG. 1 illustrates a conventional pickup truck 10 having a cab 12 and a truck cargo bed 14 .
- a preferred embodiment of the protective truck cargo bed liner 16 of the invention is installed within the truck cargo bed 14 .
- the truck bed liner 16 is typically formed from a base sheet of high density polyethylene (HDPE) or high molecular weight high density polyethylene (HMWHDPE) in a single, integral unit, and has a liner bottom wall 18 which is adapted to fit on and substantially cover the full width of the truck cargo bed floor.
- the liner bottom wall 18 will normally have a width substantially as great as the distance between the truck side rails.
- the liner bottom wall 18 typically contains a plurality of separate, inverted U-shaped longitudinal corrugations 22 .
- the bottom wall 18 also has a planar apron portion 70 at its rear margin which is adapted to fit snugly against the truck cargo bed floor adjacent the rear access opening 20 to keep foreign material from entering between the liner and the truck bed.
- the truck bed liner 16 also has two liner wheel wells 24 formed in the liner bottom wall 18 at opposite sides thereof.
- the liner wheel wells 24 are adapted to accommodate the truck cargo bed rear wheel wells (not shown).
- the liner wheel wells 24 have a top wall 26 , inside wall 28 , and two opposing end walls, one end inside wall 30 facing backward to the truck rear opening and one end wall 32 facing forward to the cab 12 .
- a liner front wall 34 is connected to and extends upwardly from the liner bottom wall 18 . As shown in FIG. 1, the liner front wall 34 preferably contains structure such as a plurality of vertically extending corrugations 36 for stability. The liner front wall 34 has an upper margin 38 adapted to fit snugly against the truck cargo bed front wall underneath the truck front rail 40 .
- Two liner side walls 42 are connected to the liner bottom wall 18 and wheel wells 24 and also the liner front wall 34 at opposite sides thereof.
- the liner front wall 34 substantially fixes and limits the distance between the liner side walls 42 at the front end of the liner 16 .
- each liner side wall 42 projects upwardly and outwardly from the liner bottom wall 18 and adjacent liner wheel well 24 .
- Each liner side wall 42 preferably has structure such as a plurality of corrugations 55 for stability and an upper margin 44 which fits snugly against the corresponding truck cargo bed wall 46 beneath the corresponding truck cargo bed side rail 48 .
- the upper margin 44 is preferably substantially co-planar with the liner side wall 42 and may be devoid of any substantial transverse flange to permit the side wall 42 to fit flush against the cargo bed wall 46 , and also to permit the liner side wall 42 to bend outwardly in a limited manner, whereby the spacing of the side walls 42 near the front of the liner will be maintained by the attached front liner wall 34 , but more rearwardly portions of the liner side wall 42 will be permitted to open outwardly a limited amount when no restrained within the truck cargo bed to facilitate full nesting of the liner with identical liners.
- pick-up cargo beds may have two or three stake channels 76 spaced along each side rail 48 , one at each end and sometimes one at the mid-point.
- These stake channels 76 are typically rectangular steel channels which extend vertically downward from the top of the side rails 48 to the floor of cargo bed, for the purpose of receiving stakes of wood or other material supporting vertically extending sides for increasing the load-containing capabilities of the truck cargo bed. Because the preferred cargo bed liner 16 extends under the truck side rails 48 all the way to the truck cargo bed side walls, the stake channel 76 would interfere with the liner side walls 42 unless means are provided to accommodate the stake channels 76 .
- the liner side walls 42 intended for use in cargo beds with stake channels 76 preferably each include a front pocket 78 , a rear pocket 82 , and , if required, a side pocket 80 .
- These side wall pockets 80 extend each side wall 42 inwardly a sufficient distance to permit it to pass around the stake channels 76 while permitting the remainder of the side wall 42 to extend outwardly to engage the truck side wall 46 .
- the configuration of the side wall pockets 78 , 80 and 82 may vary, although preferably the pockets are located and shaped to accommodate the differing stake channels of different truck cargo bed manufacturers. As with the liner side wall and wheel well surfaces, it is preferable to incline the surfaces of the pockets to permit full nesting of the liners.
- FIG. 1 While the drawings illustrate a preferred truck cargo bedliner 14 of the under rail type, the invention is equally useful and advantageous when incorporated in a truck cargo bedliner of the over rail type having flanges on the tops of the bedliner sidewalls which extend over and rest on the truck side rails in a protective manner. Examples of such over the rail type bedliners are illustrated in above-mentioned U.S. Pat. Nos. 4,341,412; 4,336,963; and 3,814,473.
- a separate one-piece tailgate liner 72 may also be attached to the tailgate of the truck in a conventional manner.
- the tailgate liner 72 has inverted U-shaped, corrugations 74 which are vertically extending when the tailgate is closed.
- the corrugations 74 are similar to the corrugations 22 of the liner bottom wall.
- the tailgate liner 72 may also advantageously include anti-slip frictional layers as described below.
- the bedliner 16 of the present invention has an undersurface that includes a base sheet 82 and an under layer 94 of an anti-slip material that reduces or eliminates rubbing between the liner 16 base sheet 82 and the cargo bed.
- the antislip under layer 94 is preferably made of a material suitable for coextrusion with the liner base sheet 82 plastic or otherwise bondable to or with the liner base sheet 82 by adhesives or thermal bonding. In any event, the under layer 94 must be securely joined to the liner base sheet 82 either by mechanical means, chemical means, or molecular interlocking between the anti-slip layer 94 and the base sheet 82 .
- bedliner sheets are produced using a coextrusion process, the process beings with virgin plastic pellets or regrind from scrap bedliner materials.
- the pellets and/or regrind are conveyed through heated barrels by rotating screws to extrude barrels that melt the pellets and/or regrind and feeds the melted plastic in streams that converge at a die block.
- the materials melt in the heated barrels they are fed through the die block and exit to be shaped into a continuous monolithic shape or sheet by steel rolls, such as embossing chrome rolls.
- the sheet cools and the outer edges are trimmed to size.
- the sheet is cut to length in a chopper and then stacked and stored before being used in a vacuum forming process to form a liner of a desired shape.
- the thickness of the sheet and the individual coextruded layers are adjustable in the process.
- a 230 thousandths of an inch thick sheet preferably has a ten thousandths of an inch under layer 94 , a 180 thousandths of an inch base sheet 82 , and a 40 thousandths of an inch interior or upper layer 84 for contacting cargo.
- the layers can be extremely thin and still provide anti-slip properties. Layers as thin as a single molecule thick can provide the desired properties. These thicknesses are approximated over the sheet area because the thermoforming process used to form the bedliner 16 will stretch the sheet and vary the material thickness depending on the draw conditions and final deposit location.
- the base sheet 82 is typically HDPE, HMW-HDPE, or other “stiff” material to provide the liner 16 with structural integrity and impact resistance.
- the anti-slip upper and under layers 84 and 94 provide resistance to shifting cargo and rubbing of the cargo bed.
- the anti-slip layers 84 and 94 also provide impact absorbance and have a good appearance.
- the anti-slip layers 84 and 94 are about 60 percent very low density polyethylene (VLDPE), about 40 percent high molecular weight high density polyethylene (HMW-HDPE), and a small amount of colorant.
- the base sheet 82 is preferably 30 to 100 percent HMW-HDPE, zero to 70 percent (for an average of about 40%) regrind from the trimming process, and a small amount of colorant. These percentages are by weight. In the base sheet 82 , the percentages fluctuate due to the available amount of regrind which contains various percentages of the materials used in the various layers, including small amounts of VLDPE.
- a suitable HMW-HDPE is Fortiflex® G50-100 available from Solvay Polymers, Inc., 3333 Richmond Avenue, Houston, Tex. 77098-3099.
- a suitable VLDPE is Flexomer® Polyolefins, DFDB-1085 Natural, available from Union Carbide Corporation, Unipol Polymers, 39 10d Ridgebury Rd., Danbury, Conn. 06817-0001.
- Such a polyolefin is a semicrystalline ethylene copolymer with elastic properties approaching those of uncured EPM and EPD rubbers to serve as an impact modifier for polypropylene.
- the thickness of the under layer 94 can be discontinuous or otherwise modified at various points or areas on the sheet to reduce cost and concentrate antiskid materials at locations where rubbing is of greater concern due to likelihood of corrosion and affect on appearance if the liner is removed. Areas of greater concern include; the cargo bed floor, the truck rails, and the front wall. In areas of less concern, such as side walls where there is little or no liner-to-wall contact, there need not be any anti-skid material. Nonetheless, when using the coextrusion process, the layers are as uniform as practical and cover the entire sheet.
- the under layer 94 can be sprayed on using known methods which result in a discontinuous layer of hardened bubbles or droplets that form a textured surface. Known spray-on materials include: isocyanates; carbamates; ureas; and polymers and co-polymers of these materials.
- the inside surface 54 of the cargo bed liner 16 is preferably provided with an integral anti-slip surface made of an upper frictional layer 84 .
- the upper layer 84 has a high coefficient of friction that will inhibit movement of material placed on the upper surface of the liner 16 during use.
- the upper layer 84 may be laminated to the upper surface of the base sheet 82 of the liner 16 during extrusion forming of the sheet prior to vacuum forming of the liner.
- suitable materials for the anti-slip layers include ethylene ethyl acetate (EEA), ethylene vinyl acetate (EVA), thermoplastic rubber (TPR), Saranex, and a modified polyolefin sold under the trademark Ren-Flex by the Ren Plastics Company.
- ESA ethylene ethyl acetate
- EVA ethylene vinyl acetate
- TPR thermoplastic rubber
- Saranex a modified polyolefin sold under the trademark Ren-Flex by the Ren Plastics Company.
- the film may be adhered to the base sheet 82 by an adhesive or by thermal attachment during the liner vacuum forming process.
- a blend of a thermoplastic rubber material sold under the trademark Kraton by Shell Oil Company, Woodbury, N.J., and a thermoplastic rubber material sold under the trademark Santoprene by Monsanto Polymers Division of Monsanto Chemical Company, St. Louis, Miss. is coextruded as a film between approximately 10 and 35 thousandths of an inch thickness, such as 25 to 30 thousandths of an inch thick on at least portions of the liner upper surface.
- a preferred blend of Kraton and Santoprene in the film in approximately equal portions provides desirable anti-slip characteristics without being tacky.
- anti-slip frictional layers 84 and 94 have been illustrated and described on a preferred plastic truck body liner, it is understood that the anti-slip frictional layers of the invention may be incorporated in thermoformed plastic truck bed liners of any desired shape or style.
Abstract
A truck cargo bed liner having an anti-slip under layer to reduce rubbing between the liner and the cargo bed. The liner may further include an upper layer of anti-slip material to resist shifting of cargo during transport.
Description
- This application is a continuation of U.S. patent application Ser. No. 09/144,663, filed Sep. 1, 1998, the disclosure of which is incorporated by reference herein.
- Not applicable.
- This invention relates to molded plastic protective liners for pickup truck cargo beds, and in particular to liners with a non-skid undersurface that protects truck beds from damage due to rubbing by the liner.
- Pickup trucks have been used for many years as working vehicles. In recent years pickup trucks have become increasingly popular as family transportation vehicles, because of their dual ability to haul passengers and cargo. The cargo bed surfaces of pickup trucks are generally finished with paint by the manufacturer. If the painted surfaces are unprotected, they can be scratched from cargo impact or deteriorated by weather or corrosives, seriously detracting from the value of the trucks. Whether a pickup truck is used as a working vehicle or as a family transportation vehicle, it is important to keep the surface of the cargo bed in a satisfactory condition.
- Various cargo bed liners used to protect the surface of cargo beds are described in prior art patents. One-piece molded plastic truck liners comprising a front wall, opposing side walls and a bottom wall are shown in U.S. Pat. Nos. 4,341,412 to Wayne; 4,336,963 to Nix et al.; 4,181,349 to Nix et al.; 4,047,749 to Lambitz; 3,814,473 to Lorenzen; and 4,592,583 to Dresen. All of the above patents show plastic liners that fit in the truck cargo bed and bear on the bed floor, walls, and rails at various points of contact, either by design or due to irregular liner shapes and warping after the vacuum-formed manufacturing process. Where the liner meets the cargo bed there may be rubbing because one-piece molded plastic truck liners shift, particularly as the truck is being loaded and unloaded, and as cargo shifts during transport. As the liner shifts there may be rubbing on the surfaces of the truck cargo bed that can scuff, scratch, and remove paint and paint undercoats. When paint and paint undercoats are damaged, rusting of the truck bed may occur thereby exposing the truck bed to corrosion which adversely affects the appearance of the truck.
- There are known truck cargo bed liners having anti-slip upper surface for restraining cargo during transport, loading, and unloading. The anti-slip surfaces comprise a layer having a higher co-efficient of friction than the plastic forming the liner. (See: U.S. Pat. No. 4,693,507, for example.) The non-slip layer may be coextruded with, adhered to, or thermally attached to the plastic base material before or during the liner vacuum forming process. Although non-slip upper surfaces in bedliners are effective for restraining cargo during transport, there is additional rubbing of the under side of the HDPE base material against the truck cargo bed because the cargo's weight shifts the cargo and the liner to which it is now restrained.
- A need exists for a one-piece plastic protective cargo bed liner for engagement with at least a portion of the truck cargo bed which will reduce damage to the cargo bed from rubbing by the liners.
- The present invention is a protective truck bed liner adapted to reduce rubbing between the liner and the truck bed. The liner includes an anti-slip under layer preferably made of a plastic material that is either coextruded with or otherwise adhered to a base sheet of plastic used to vacuum form the liner.
- The under layer has a coefficient of friction high enough to reduce rubbing and thereby protect the truck cargo bed by reducing damage due to the installation of the liner. The under layer can be a composition including very low density polyethylene and very high molecular weight high density polyethylene which can be in portions of about sixty percent and forty percent, respectively. The under layer may be a composition including a polyolefin and the polyolefin may be between thirty and fifty percent of the composition and is preferably about forty percent of the composition. The under layer can be as thin as a single molecular layer of anti-skid material and is preferably at least ten thousandths of an inch thick. The under layer can be uniform thickness or selectively applied to specific areas of the liner to protect cargo bed components that are more susceptible to wear.
- In addition, an upper anti-slip layer can be used and it can be of the same composition as the under layer. The upper layer can be as thin as a single molecular layer of anti-skid material and is preferably at least approximately forty thousandths of an inch thick.
- It is an object of the invention to provide a plastic truck cargo bed liner having an integral, durable anti-slip under layer.
- It is a further object of the invention to provide a plastic protective truck cargo bed liner having an under layer that is durable.
- It is an additional object of the invention to provide a plastic protective truck cargo bed liner having an anti-slip under layer joined to at least a portion of the liner under surface.
- Other objects, advantages and features of the present invention will become apparent from the following detailed description in conjunction with the accompanying drawings.
- FIG. 1 is a perspective view of a cargo bed liner of the present invention installed in a pickup truck.
- FIG. 2 is a fragmentary sectional view taken substantially along line2-2 of FIG. 1.
- FIG. 3 is a fragmentary sectional view of a cargo bed base sheet sandwiched by anti-slip layers.
- FIG. 1 illustrates a
conventional pickup truck 10 having acab 12 and atruck cargo bed 14. A preferred embodiment of the protective truckcargo bed liner 16 of the invention is installed within thetruck cargo bed 14. - The
truck bed liner 16 is typically formed from a base sheet of high density polyethylene (HDPE) or high molecular weight high density polyethylene (HMWHDPE) in a single, integral unit, and has aliner bottom wall 18 which is adapted to fit on and substantially cover the full width of the truck cargo bed floor. Theliner bottom wall 18 will normally have a width substantially as great as the distance between the truck side rails. As shown in FIG. 2, theliner bottom wall 18 typically contains a plurality of separate, inverted U-shapedlongitudinal corrugations 22. Thebottom wall 18 also has aplanar apron portion 70 at its rear margin which is adapted to fit snugly against the truck cargo bed floor adjacent the rear access opening 20 to keep foreign material from entering between the liner and the truck bed. - The
truck bed liner 16 also has twoliner wheel wells 24 formed in theliner bottom wall 18 at opposite sides thereof. Theliner wheel wells 24 are adapted to accommodate the truck cargo bed rear wheel wells (not shown). Theliner wheel wells 24 have atop wall 26, insidewall 28, and two opposing end walls, one end insidewall 30 facing backward to the truck rear opening and oneend wall 32 facing forward to thecab 12. - A
liner front wall 34 is connected to and extends upwardly from theliner bottom wall 18. As shown in FIG. 1, theliner front wall 34 preferably contains structure such as a plurality of vertically extendingcorrugations 36 for stability. Theliner front wall 34 has anupper margin 38 adapted to fit snugly against the truck cargo bed front wall underneath thetruck front rail 40. - Two
liner side walls 42 are connected to theliner bottom wall 18 andwheel wells 24 and also theliner front wall 34 at opposite sides thereof. Theliner front wall 34 substantially fixes and limits the distance between theliner side walls 42 at the front end of theliner 16. As shown in FIGS. 1 and 2, eachliner side wall 42 projects upwardly and outwardly from theliner bottom wall 18 and adjacent liner wheel well 24. Eachliner side wall 42 preferably has structure such as a plurality ofcorrugations 55 for stability and anupper margin 44 which fits snugly against the corresponding truckcargo bed wall 46 beneath the corresponding truck cargobed side rail 48. Theupper margin 44 is preferably substantially co-planar with theliner side wall 42 and may be devoid of any substantial transverse flange to permit theside wall 42 to fit flush against thecargo bed wall 46, and also to permit theliner side wall 42 to bend outwardly in a limited manner, whereby the spacing of theside walls 42 near the front of the liner will be maintained by the attachedfront liner wall 34, but more rearwardly portions of theliner side wall 42 will be permitted to open outwardly a limited amount when no restrained within the truck cargo bed to facilitate full nesting of the liner with identical liners. - It can be seen from FIG. 1 that pick-up cargo beds may have two or three
stake channels 76 spaced along eachside rail 48, one at each end and sometimes one at the mid-point. Thesestake channels 76 are typically rectangular steel channels which extend vertically downward from the top of theside rails 48 to the floor of cargo bed, for the purpose of receiving stakes of wood or other material supporting vertically extending sides for increasing the load-containing capabilities of the truck cargo bed. Because the preferredcargo bed liner 16 extends under the truck side rails 48 all the way to the truck cargo bed side walls, thestake channel 76 would interfere with theliner side walls 42 unless means are provided to accommodate thestake channels 76. Theliner side walls 42 intended for use in cargo beds withstake channels 76 preferably each include afront pocket 78, arear pocket 82, and , if required, aside pocket 80. These side wall pockets 80 extend eachside wall 42 inwardly a sufficient distance to permit it to pass around thestake channels 76 while permitting the remainder of theside wall 42 to extend outwardly to engage thetruck side wall 46. The configuration of the side wall pockets 78, 80 and 82 may vary, although preferably the pockets are located and shaped to accommodate the differing stake channels of different truck cargo bed manufacturers. As with the liner side wall and wheel well surfaces, it is preferable to incline the surfaces of the pockets to permit full nesting of the liners. - While the drawings illustrate a preferred
truck cargo bedliner 14 of the under rail type, the invention is equally useful and advantageous when incorporated in a truck cargo bedliner of the over rail type having flanges on the tops of the bedliner sidewalls which extend over and rest on the truck side rails in a protective manner. Examples of such over the rail type bedliners are illustrated in above-mentioned U.S. Pat. Nos. 4,341,412; 4,336,963; and 3,814,473. - A separate one-
piece tailgate liner 72 may also be attached to the tailgate of the truck in a conventional manner. Thetailgate liner 72 has inverted U-shaped, corrugations 74 which are vertically extending when the tailgate is closed. Thecorrugations 74 are similar to thecorrugations 22 of the liner bottom wall. Thetailgate liner 72 may also advantageously include anti-slip frictional layers as described below. - The
bedliner 16 of the present invention (FIG. 3) has an undersurface that includes abase sheet 82 and an underlayer 94 of an anti-slip material that reduces or eliminates rubbing between theliner 16base sheet 82 and the cargo bed. The antislip underlayer 94 is preferably made of a material suitable for coextrusion with theliner base sheet 82 plastic or otherwise bondable to or with theliner base sheet 82 by adhesives or thermal bonding. In any event, the underlayer 94 must be securely joined to theliner base sheet 82 either by mechanical means, chemical means, or molecular interlocking between theanti-slip layer 94 and thebase sheet 82. - When bedliner sheets are produced using a coextrusion process, the process beings with virgin plastic pellets or regrind from scrap bedliner materials. The pellets and/or regrind are conveyed through heated barrels by rotating screws to extrude barrels that melt the pellets and/or regrind and feeds the melted plastic in streams that converge at a die block.
- Different blends of materials are fed through separate extruders to create an anti-skid or “softer” material in one layer to become the liner under layer, and a
liner base sheet 82 of HDPE or HMW-HDPE. If a skid-resistant upper orinterior layer 84 is desired, a third material or the same anti-skid material used in the underlayer 94 can be diverted in the die block to sandwich the HDPE material in theliner base sheet 82. - As the materials melt in the heated barrels, they are fed through the die block and exit to be shaped into a continuous monolithic shape or sheet by steel rolls, such as embossing chrome rolls. The sheet cools and the outer edges are trimmed to size. The sheet is cut to length in a chopper and then stacked and stored before being used in a vacuum forming process to form a liner of a desired shape.
- The thickness of the sheet and the individual coextruded layers are adjustable in the process. For example, a 230 thousandths of an inch thick sheet preferably has a ten thousandths of an inch under
layer 94, a 180 thousandths of aninch base sheet 82, and a 40 thousandths of an inch interior orupper layer 84 for contacting cargo. The layers can be extremely thin and still provide anti-slip properties. Layers as thin as a single molecule thick can provide the desired properties. These thicknesses are approximated over the sheet area because the thermoforming process used to form thebedliner 16 will stretch the sheet and vary the material thickness depending on the draw conditions and final deposit location. - As stated, the
base sheet 82 is typically HDPE, HMW-HDPE, or other “stiff” material to provide theliner 16 with structural integrity and impact resistance. The anti-slip upper and underlayers - Preferably, the anti-slip layers84 and 94 are about 60 percent very low density polyethylene (VLDPE), about 40 percent high molecular weight high density polyethylene (HMW-HDPE), and a small amount of colorant. The
base sheet 82 is preferably 30 to 100 percent HMW-HDPE, zero to 70 percent (for an average of about 40%) regrind from the trimming process, and a small amount of colorant. These percentages are by weight. In thebase sheet 82, the percentages fluctuate due to the available amount of regrind which contains various percentages of the materials used in the various layers, including small amounts of VLDPE. - A suitable HMW-HDPE is Fortiflex® G50-100 available from Solvay Polymers, Inc., 3333 Richmond Avenue, Houston, Tex. 77098-3099. A suitable VLDPE is Flexomer® Polyolefins, DFDB-1085 Natural, available from Union Carbide Corporation, Unipol Polymers, 39 10d Ridgebury Rd., Danbury, Conn. 06817-0001. Such a polyolefin is a semicrystalline ethylene copolymer with elastic properties approaching those of uncured EPM and EPD rubbers to serve as an impact modifier for polypropylene.
- The thickness of the
under layer 94 can be discontinuous or otherwise modified at various points or areas on the sheet to reduce cost and concentrate antiskid materials at locations where rubbing is of greater concern due to likelihood of corrosion and affect on appearance if the liner is removed. Areas of greater concern include; the cargo bed floor, the truck rails, and the front wall. In areas of less concern, such as side walls where there is little or no liner-to-wall contact, there need not be any anti-skid material. Nonetheless, when using the coextrusion process, the layers are as uniform as practical and cover the entire sheet. Alternatively, the underlayer 94 can be sprayed on using known methods which result in a discontinuous layer of hardened bubbles or droplets that form a textured surface. Known spray-on materials include: isocyanates; carbamates; ureas; and polymers and co-polymers of these materials. - As stated above, the
inside surface 54 of thecargo bed liner 16 is preferably provided with an integral anti-slip surface made of an upperfrictional layer 84. Theupper layer 84 has a high coefficient of friction that will inhibit movement of material placed on the upper surface of theliner 16 during use. Theupper layer 84 may be laminated to the upper surface of thebase sheet 82 of theliner 16 during extrusion forming of the sheet prior to vacuum forming of the liner. In addition to the mix described above, suitable materials for the anti-slip layers include ethylene ethyl acetate (EEA), ethylene vinyl acetate (EVA), thermoplastic rubber (TPR), Saranex, and a modified polyolefin sold under the trademark Ren-Flex by the Ren Plastics Company. The film may be adhered to thebase sheet 82 by an adhesive or by thermal attachment during the liner vacuum forming process. - Optionally, a blend of a thermoplastic rubber material sold under the trademark Kraton by Shell Oil Company, Woodbury, N.J., and a thermoplastic rubber material sold under the trademark Santoprene by Monsanto Polymers Division of Monsanto Chemical Company, St. Louis, Miss. is coextruded as a film between approximately 10 and 35 thousandths of an inch thickness, such as 25 to 30 thousandths of an inch thick on at least portions of the liner upper surface. A preferred blend of Kraton and Santoprene in the film in approximately equal portions provides desirable anti-slip characteristics without being tacky. These and other features are disclosed in U.S. Pat. No. 4,693,507, which is incorporated herein by reference.
- While the anti-slip
frictional layers - It is understood that the invention is not confined to the particular construction and arrangement of parts herein illustrated and described, but embraces such modified forms thereof as come within the scope of the following claims.
Claims (25)
1. A truck cargo bed liner of unitary vacuum formed plastic having a base sheet with an under side for engagement with a truck cargo bed, comprising:
a liner bottom;
two liner wheel well covers formed at opposite sides of the liner bottom;
a liner front wall connected to and extending upwardly from the liner bottom wall;
two liner side walls connected to the liner bottom wall and wheel wells and the liner front wall at opposite sides thereof, each liner side wall projecting upwardly from the liner bottom wall and adjacent a wheel well cover; and
an under layer having an effectively high coefficient of friction joined to the under side of the base sheet forming the liner.
2. The truck liner of claim 1 , and further comprising:
an upper layer having an effectively high coefficient of friction joined to an upper surface of the base sheet forming the liner.
3. The liner of claim 1 , wherein the under layer was coextruded with the base sheet forming the liner prior to vacuum forming the liner.
4. The liner of claim 1 , wherein the under layer was laminated to the base sheet forming the liner by extrusion forming of the base sheet prior to vacuum forming the liner.
5. The liner of claim 1 , wherein the under layer was joined to the base sheet forming the liner by an adhesive applied prior to vacuum forming the liner.
6. The liner of claim 1 , wherein the under layer was joined to the base sheet forming the liner by a thermal attachment process prior to vacuum forming the liner.
7. The liner of claim 1 , wherein the under layer was joined to the base sheet forming the liner by spraying under layer material on the liner base sheet prior to forming the liner.
8. The liner of claim 1 , wherein the under layer is joined to only a portion of the underside of the liner base sheet.
9. The liner of claim 1 , wherein the under layer is joined to substantially all of the underside of the liner base sheet.
10. The liner of claim 1 , wherein the under layer has a thickness of not less than about ten thousandths of an inch.
11. The liner of claim 1 , wherein the under layer is a composition including very low density polyethylene and high molecular weight high density polyethylene.
12. The liner of claim 1 , wherein the under layer is a composition including about sixty percent very low density polyethylene and about forty percent high molecular weight high density polyethylene.
13. The liner of claim 1 , wherein the under layer is a composition including polyolefin.
14. The liner of claim 1 , wherein the under layer is a composition including polyolefin selected from the group consisting of:
polyethylene;
polypropylene;
polybutylene; and
polybutadiene.
15. The liner of claim 1 , wherein the under layer is a composition selected from the group consisting of:
isocyanates;
carbamates; and
ureas; and
polymers and co-polymers thereof.
16. The liner of claim 1 , wherein the under layer is a composition including about sixty percent very low density polyethylene and about forty percent polyolefin.
17. The liner of claim 1 , wherein the under layer is a composition including polyolefin in a range of about 30 to 50 percent polyolefin.
18. The liner of claim 2 , wherein the upper layer was coextruded with the base sheet and the under layer.
19. The liner of claim 2 , wherein the upper layer has a thickness of not less than about forty thousandths of an inch.
20. The liner of claim 2 , wherein the upper layer is a composition including very low density polyethylene and high molecular weight high density polyethylene.
21. The liner of claim 2 , wherein the upper layer is a composition including about sixty percent very low density polyethylene and forty percent high molecular weight high density polyethylene.
22. The liner of claim 2 , wherein the upper layer is a composition including polyolefin.
23. The liner of claim 2 , wherein the upper layer is a composition including about sixty percent very low density polyethylene and about forty percent polyolefin.
24. The liner of claim 2 , wherein the upper layer is a composition including polyolefin in a range of about 30 to 50 percent polyolefin.
25. The liner of claim 1 , wherein the liner base sheet includes a high molecular weight high density polyethylene.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/155,438 US20020140247A1 (en) | 1998-09-01 | 2002-05-24 | Bedliner with anti-slip under layer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/144,663 US6431629B1 (en) | 1998-09-01 | 1998-09-01 | Bedliner with anti-slip under layer |
US10/155,438 US20020140247A1 (en) | 1998-09-01 | 2002-05-24 | Bedliner with anti-slip under layer |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/144,663 Continuation US6431629B1 (en) | 1998-09-01 | 1998-09-01 | Bedliner with anti-slip under layer |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020140247A1 true US20020140247A1 (en) | 2002-10-03 |
Family
ID=22509576
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/144,663 Expired - Fee Related US6431629B1 (en) | 1998-09-01 | 1998-09-01 | Bedliner with anti-slip under layer |
US10/155,438 Abandoned US20020140247A1 (en) | 1998-09-01 | 2002-05-24 | Bedliner with anti-slip under layer |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/144,663 Expired - Fee Related US6431629B1 (en) | 1998-09-01 | 1998-09-01 | Bedliner with anti-slip under layer |
Country Status (1)
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US (2) | US6431629B1 (en) |
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US20050170733A1 (en) * | 2001-10-29 | 2005-08-04 | Polymer Group, Inc. | Protective layer for automotive surfaces |
US20030119392A1 (en) * | 2001-10-29 | 2003-06-26 | Polymer Group, Inc. | Protective layer for automotive surfaces |
US6869122B2 (en) * | 2001-10-29 | 2005-03-22 | Polymer Group, Inc. | Protective layer for automotive surfaces |
US7086680B2 (en) | 2002-11-08 | 2006-08-08 | Durakon Industries, Inc. | Bed liner having enhanced frictional characteristics |
US6848733B2 (en) * | 2002-11-08 | 2005-02-01 | Durakon Industries, Inc. | Co-formed bed liner having enhanced frictional characteristics |
US20040197521A1 (en) * | 2003-01-10 | 2004-10-07 | Morriston James C. | Reversible slip-resistant trunk liner |
US6840559B2 (en) * | 2003-02-14 | 2005-01-11 | Claudio Burtin | Combination truck bed liner |
US20050127700A1 (en) * | 2003-02-14 | 2005-06-16 | Claudio Burtin | Combination truck bed liner |
US20040160077A1 (en) * | 2003-02-14 | 2004-08-19 | Claudio Burtin | Combination truck bed liner |
US7093875B2 (en) * | 2003-02-14 | 2006-08-22 | Claudio Burtin | Combination truck bed liner |
US20050174184A1 (en) * | 2004-02-05 | 2005-08-11 | Yue Wu | Temperature compensated voltage controlled oscillator |
US20090212584A1 (en) * | 2008-02-21 | 2009-08-27 | Hill Dean E | Cargo management system |
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US10532687B2 (en) * | 2014-02-10 | 2020-01-14 | Buyers Products Company | Quick-mounting accessory for a truck |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: PENDA CORPORATION, WISCONSIN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:EMERY, PHILLIP L.;REEL/FRAME:012955/0116 Effective date: 19980924 |
|
STCB | Information on status: application discontinuation |
Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION |