CA2000871A1 - Slip pallet with a cushioning effect - Google Patents
Slip pallet with a cushioning effectInfo
- Publication number
- CA2000871A1 CA2000871A1 CA 2000871 CA2000871A CA2000871A1 CA 2000871 A1 CA2000871 A1 CA 2000871A1 CA 2000871 CA2000871 CA 2000871 CA 2000871 A CA2000871 A CA 2000871A CA 2000871 A1 CA2000871 A1 CA 2000871A1
- Authority
- CA
- Canada
- Prior art keywords
- pallet
- dimples
- spaced apart
- top surface
- sphere
- 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
Links
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
- B65D19/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D19/36—Pallets comprising a flexible load carrier extending between guide elements, e.g. guide tubes
Abstract
ABSTRACT OF THE DISCLOSURE
A slip pallet formed as a square or rectangular sheet of a plastic material having a central body portion on which a load, such as an array of loaded cardboard boxes, is supported and a plurality of lip portions extending outwardly and upwardly from the central body portion wherein at least the central body portion is provided with a plurality of spaced apart dimples formed in the top surface of the central body portions so that a plurality of spaced apart projections extend downwardly from the bottom surface of the central body portion to provide a cushioning support for the load and wherein at least a portion of each projection is a segment of a sphere.
A slip pallet formed as a square or rectangular sheet of a plastic material having a central body portion on which a load, such as an array of loaded cardboard boxes, is supported and a plurality of lip portions extending outwardly and upwardly from the central body portion wherein at least the central body portion is provided with a plurality of spaced apart dimples formed in the top surface of the central body portions so that a plurality of spaced apart projections extend downwardly from the bottom surface of the central body portion to provide a cushioning support for the load and wherein at least a portion of each projection is a segment of a sphere.
Description
20~)0~
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p~ Mail Fo~r O~ Addra~se~ vlc~ und~r CFR ~ lUon ~he-1s!~ t~ ^al~ k~w;3n~ ad-dross~ ih~ r~ol~lrllisslel~ nl ~ rllS .3nd Tracieli :~r~
JOSEPH J. KELLY
bn~un~
February/~ , 1989 (da~
SLIP PALLET WITH A CUS~IONING EFFECT
Field of the Invention This invention relates generally to pallets for use in 05 supporting loads during shipment or storage of materials and more specifically to a slip pallet with a cushioning effect for a load supported thereon, such as an array of cardboard boxes holding beverage containers.
Background of the Inventlon Plastic slip pallets, such as those described in U.S.
Patent Nos. 3,776,145; 3,850,116 and 4,042,127, have been used for ease of storage and handling of a load of boxes supported thereon in a warehouse, a manufacturing facility and during shipment by rail or by truck. A plastic slip pallet has a lip means adapted to be gripped by a lift truck and held in tension while ælipping a platen, or spatula-like member, of the lift truck under the plastic 81ip pallet.
The platen then lifts the plastic slip pallet and the boxes supported thereon and transports them to a desired location where the slip pallet and the boxes are pushed off the platen. A recent development in plastic slip pallets is disclosed in U.S. Patent No. 4,507,348 to Nagata et al. The . . .:: . . .: : . ~ .
' ' :: : .. ,. : ' .,. . . ~ :
~001)~37i :
slip pallet in Nagata et al. comprises a support member comprising an interlining core sandwiched between and secured to two linerq and has a flap portlon continuous to the support member through a bending portion in which the 05 interlining core and the two liners are compressed together and fused into one continuous layer to provide a hinge effect. While the corrugated slip pallet of Nagata et al.
does provide a cushioning effect, lt is expensive to manu-facture.
Brief Description of the Invention This invention provides a slip pallet with a cushioning effect comprising a sheet of single ply plastic material having a plurality of spaced apart dimples formed therein to provide a cushioning effect while retaining its load sup-porting properties.
In the preferred embodiment of the invention. the slip pallet is formed from a single ply of plastic material, such as polypropylene or high density polyethylene, having a thickness of between about 0.040 and 0.125 inch and a stiffness measurement in the range of 120,000 to 180,000 psi as determined by ASTM specification D 790B. The slip pallet has opposite pairs of generally parallel edges to define a central body portion for supporting a load, such as an array of cardboard boxes holding filled beverage containers. The central body portion originally has a generally planar top surface and a generally planar bottom surface. A plurality of spaced apart dimples are formed downwardly from the top surface so as to form a plurality of spaced apart projections extending downwardly from the bottom surface. The dimples :. : : , - , : : : : : ::
: ' ~
87~
are generally spherlcal segments having an outer radius of between about 0.1875 and 0.563 inch and a depth from the bottom surface to the crest of the dimple of between about 0.094 and 0.281 inch so that the pro~lections formed thereby S have outer surfaces whlch are segments of a sphere. The pro~ections have a density of between about 0.75 to 2.00 per square inch and a surface area of between about 60 to 95 per cent of the entlre surface area of the top surface. At least one integral llp portion extends outwardly and upwardly from one of the edges. Suitable materials for forming the plastic slip pallet are ~et forth in U.S. Patent 3,776,145 from Column 8, Line 43, to Column 9, Line 15. The preferred .
embodiment of thi~ invention uses a copolymer of poly-propylene marketed by Hercules Powder Co. of Wilmington, Delaware, under the trade designation pro-fo ~)8623. - :
Brief DescrlPtion of the Drawlngs An illustrative and presently preferred embodiment of the invention is shown in the accompanying drawings in which:
Fig. 1 is a perspective view of the preferred embodi-ment of the invention:
Fig. 2 is a cross-sectional view taken on the line 2-2 of Fig. l;
Fig. 3 is an enlarged cross-sectional view similar to a portion of Flg. 2 but with no load supported thereon;
Fig. 4 is an enlarged cross-sectional view similar to Fig. 3 but with a load supported thereon;
., . , . ' , . ' ' ' ' .. ' ' ' : " , ' ' ' , ' ' ~ " ., ' . ~: ' ' . ' 87i Fig. 5 i5 an enlarged cross-sectional view of another modification of the invention but with no load supported thereon; and Flgs. 6 and 7 are illustrations for use with the 05 ~ormula set forth in the specification.
Detailed Description of the Inventlon The preferred embodiment of the invention is illustrated in the drawing and comprises a slip pallet 2 formed from a single ply of plastic material such as polypropylene or a high density polyethylene or other materials having similar characteristics. The plastic material has a thickness between about 0.040 and 0.125 inch and a stiffness measure-ment in the range of 120,000 to 180,000 psi and preferably 15 about 160,000 psi as determined by ASTM apecification D
790~. The slip pallet 2 has opposite pairs of generally parallel edges 4 and 6 to define a central body portion 8 originally having a generally planar top surface 10 and a generally planar bottom surface 12. Integral lip portions 14 are formed in a conventional manner and extend outwardly and upwardly from the generally paral~el edges 4 and one of the generally parallel edges 6. If desired, the slip pallet 2 ~nay have diagonally cut corners 16 preventing edges 4 and 6 from intersecting.
A plurality of dimples 20 are formed in the top surface 10 so that a plurality of projections 22 extend downwardly from tha bottom surface 12. The dimples 20 have an lnner surface 24 that is a segment of a sphere and the projections 22 have an outer surface 26 which is a segment of a sphere.
30 The radius of the outer surface 26 is between about 0.1875 . .~ . - : . , . ~ ,. : :
- . : ~ ~. . ~ ., - , . . - .: . ~
~000137~
and 0.563 inch and the projections 22 have a depth, measured from the bottom surface 12 to the cre~t of the pro;ection 22, of between about 0.094 and 0.281 :lnch. The centers for the sphere6 of the outer surface3 26 are located above the 05 top surface 10 a distance equal to one-half of the radius minus the thickness between the planar portions of the top and bottom surfaces. In accordance with this invention, the depth of each projection 22 from the bottom surface 12 will be about one-half the radlus of the outer surface 26. The dimples 20 have centers which are spaced apart a distance of between about 0.75 and 1.50 inches and have a denslty of between about 0.75 and 2.00 per square inch and a surface area of between about 65 and 9Q per cent of the top surface 10. As illustrated in Fig. 1, the dimples 20 preferably lS extend in spaced apart parallel rows which rows are parallel to the opposite parallel edges 4 and perpendlcular to the opposite parallel edges 6. There are no dimples 20 in the lip portions 14 integral with the opposite edge portions 4, but there are dimples in the lip portion 14 integral with the one edge 6.
In Fig. 3, there is illustrated one dimple 20 of a central body portion 8 wherein the thickness of the plastic sheet between dlmples 20 ls about 0.051 lnch. The outer surface 26 of each of the dimples 20 has a radius of about 0.250 inch and are on spaced apart centers of about 1.00 inch. The center for the radius is located about 0.074 inch above the top surface 10. Each projection 22 has a depth of about 0.125 inch from the bottom surface 12 to the crest of the pro~ectlon 22. In Fig. 4, there i5 illustrated the same dimple 20 when a load of about 6,000 pounds per square foot : ~ . . : ~ . . i .
' . . . - : .~
- . : - ::
: . . .
; : .
~0~)0871 ls being supported by the central body portion 8. The depth of the pro~ection 22 has been decreased by about 0.042 inch 50 that the dimple 20 still has a depth of about 0.083 inch and is fully capable of supporting greater loads. A slip os pallet 2 having the dimples 20 as described above is capable of supporting loads up to about 10,000 pounds per square foot and still providing a cushioning effect.
In some instances, the use of a slip pallet 2 as illustrated in Figs. 1 - 4 present some problems in that there is a tendency for the slip pallet 2 to slide when being supported on a platen a~ lllustrated in u.s. Patent No. 3,776,145. In Fig. 5, there is illustrated a slip pallet 30 where a portion 32 of the outer surface 24 i8 relatively planar so that the portion 34 of the inner surface 26 is also relatively planar so as to provide a greater surface area for contact with the surface of the platen so as to provide greater frictional forces to prevent the sliding of the slip pallet 30 on the platen. The arcuate outer surface 36 is a frustum of a sphere having a 20 radius of between about 0.185 and 0.563 inch and wherein the center of the sphere is located a distance above the top surface 10 equal to one-half the radius minus the thickness between the planar portions of the top and bottom surfaces.
The portion 32 has a depth of between about 0.061 and 0.248 inch and the planar eurface 32 has a diameter of between about 0.1875 and 0.563 inch. In a preferred embodiment of the dimple of Fig. 5, the surface 32 has a diameter of about 0.25 inch and a depth of 0.092 inch. The arcuate outer surface 36 has a radius of about 0.25 wherein the center 38 .: : . . ~ . . :
': . .: ' , : ' , : . :
: : - - : ~ : . -: ' . :
,- ~ ,.. . . .
, ~ .
2t~)0871 of the sphere is located 0.074 inch above the bottom surface 12.
When the slip pallets of this invention are used in the shipment by truck or rail of filled beverage containers 05 packed in boxes, the weight on each slip pallet is between about 2,100 and 2,600 pounds per square foot. In normal practice, one slip pallet is loaded on top of another slip -pallet so that the load on the bottom slip pallet is between about 4,200 and 5,200 pounds per square foot. During shipment, the truck or rail car may periodically place additional loads on the slip pallets. During such additional loads, the pro~ections will be depressed in an amount relative to the additional load, but after the additional load has been removed, the pro~ections will resile to their configuration prior to the additional load.
The above-described preferred embodiment i8 based on a load on the bottom slip pallet of between about 4,200 and 5,200 pounds per square foot. The specific construction of the slip pallet with dimple~ for any desired load may be calculated in the following manner.
:
.
" '.
, .
)0~371 The conventional formula for the deflection of a sphere, illustrated in Fig. 6, wherein the dimple has been inverted for explanation purposes only, is:
deflection y = APR-16 ~ D
where D = Et 12(1- ~) R = outer radius of the dimple where r= poissons ratio A - 18 from the following table ~ 0 1 _ 2 3 4 5 6 A 1 .996 .935 .754 .406 .321 .210 wherein .7~ ~ 2 V3(1- r) x ~hjt E - Young's modulus of elasticity t = final thickness 5 where final thickness t = initial thickness (F) x ( c~ )~
t e r(F) ~2)~(R~ - d~
L D cos- d/RJ
where F = flat sheet thickness R = outer radius of the dimple d = di6tance R is spaced from centerllne of F
1 - diameter of the bottom portion B of the segment of the sphere c - circumference of the bottom portion s of the segment of the sphere for a semi-sphere d = 0 and D = 2R
t = ( )[D (~/2)¦
F R~ = F
D^ (~_ )L ( ~ )~
The conventional formula for P which the load distributlon, illustrated in Fig. 7, is:
P = load lbs/ft~l = load (C~) = lbs./dimple (12"/C)(12"/C) 144 30 where C is space between centers of the dimple. :~
: .~
;~00~871 While illustrative and presently preferred embodiments of the invention have been described in detail herein, it is to be understood that the inventive concepts may be otherwise variously embodied and employed and that the appended claims 05 are intended to be construed to include ~uch variations except insofar as limited by the prior art.
.
,:' .
,.
. :
.
Ldb~b~21281728w Ih~byoermythatthbpaperor~eebbdn0de po~ltedwithth~lJnil~dS~a~esPo~alServlce'~
p~ Mail Fo~r O~ Addra~se~ vlc~ und~r CFR ~ lUon ~he-1s!~ t~ ^al~ k~w;3n~ ad-dross~ ih~ r~ol~lrllisslel~ nl ~ rllS .3nd Tracieli :~r~
JOSEPH J. KELLY
bn~un~
February/~ , 1989 (da~
SLIP PALLET WITH A CUS~IONING EFFECT
Field of the Invention This invention relates generally to pallets for use in 05 supporting loads during shipment or storage of materials and more specifically to a slip pallet with a cushioning effect for a load supported thereon, such as an array of cardboard boxes holding beverage containers.
Background of the Inventlon Plastic slip pallets, such as those described in U.S.
Patent Nos. 3,776,145; 3,850,116 and 4,042,127, have been used for ease of storage and handling of a load of boxes supported thereon in a warehouse, a manufacturing facility and during shipment by rail or by truck. A plastic slip pallet has a lip means adapted to be gripped by a lift truck and held in tension while ælipping a platen, or spatula-like member, of the lift truck under the plastic 81ip pallet.
The platen then lifts the plastic slip pallet and the boxes supported thereon and transports them to a desired location where the slip pallet and the boxes are pushed off the platen. A recent development in plastic slip pallets is disclosed in U.S. Patent No. 4,507,348 to Nagata et al. The . . .:: . . .: : . ~ .
' ' :: : .. ,. : ' .,. . . ~ :
~001)~37i :
slip pallet in Nagata et al. comprises a support member comprising an interlining core sandwiched between and secured to two linerq and has a flap portlon continuous to the support member through a bending portion in which the 05 interlining core and the two liners are compressed together and fused into one continuous layer to provide a hinge effect. While the corrugated slip pallet of Nagata et al.
does provide a cushioning effect, lt is expensive to manu-facture.
Brief Description of the Invention This invention provides a slip pallet with a cushioning effect comprising a sheet of single ply plastic material having a plurality of spaced apart dimples formed therein to provide a cushioning effect while retaining its load sup-porting properties.
In the preferred embodiment of the invention. the slip pallet is formed from a single ply of plastic material, such as polypropylene or high density polyethylene, having a thickness of between about 0.040 and 0.125 inch and a stiffness measurement in the range of 120,000 to 180,000 psi as determined by ASTM specification D 790B. The slip pallet has opposite pairs of generally parallel edges to define a central body portion for supporting a load, such as an array of cardboard boxes holding filled beverage containers. The central body portion originally has a generally planar top surface and a generally planar bottom surface. A plurality of spaced apart dimples are formed downwardly from the top surface so as to form a plurality of spaced apart projections extending downwardly from the bottom surface. The dimples :. : : , - , : : : : : ::
: ' ~
87~
are generally spherlcal segments having an outer radius of between about 0.1875 and 0.563 inch and a depth from the bottom surface to the crest of the dimple of between about 0.094 and 0.281 inch so that the pro~lections formed thereby S have outer surfaces whlch are segments of a sphere. The pro~ections have a density of between about 0.75 to 2.00 per square inch and a surface area of between about 60 to 95 per cent of the entlre surface area of the top surface. At least one integral llp portion extends outwardly and upwardly from one of the edges. Suitable materials for forming the plastic slip pallet are ~et forth in U.S. Patent 3,776,145 from Column 8, Line 43, to Column 9, Line 15. The preferred .
embodiment of thi~ invention uses a copolymer of poly-propylene marketed by Hercules Powder Co. of Wilmington, Delaware, under the trade designation pro-fo ~)8623. - :
Brief DescrlPtion of the Drawlngs An illustrative and presently preferred embodiment of the invention is shown in the accompanying drawings in which:
Fig. 1 is a perspective view of the preferred embodi-ment of the invention:
Fig. 2 is a cross-sectional view taken on the line 2-2 of Fig. l;
Fig. 3 is an enlarged cross-sectional view similar to a portion of Flg. 2 but with no load supported thereon;
Fig. 4 is an enlarged cross-sectional view similar to Fig. 3 but with a load supported thereon;
., . , . ' , . ' ' ' ' .. ' ' ' : " , ' ' ' , ' ' ~ " ., ' . ~: ' ' . ' 87i Fig. 5 i5 an enlarged cross-sectional view of another modification of the invention but with no load supported thereon; and Flgs. 6 and 7 are illustrations for use with the 05 ~ormula set forth in the specification.
Detailed Description of the Inventlon The preferred embodiment of the invention is illustrated in the drawing and comprises a slip pallet 2 formed from a single ply of plastic material such as polypropylene or a high density polyethylene or other materials having similar characteristics. The plastic material has a thickness between about 0.040 and 0.125 inch and a stiffness measure-ment in the range of 120,000 to 180,000 psi and preferably 15 about 160,000 psi as determined by ASTM apecification D
790~. The slip pallet 2 has opposite pairs of generally parallel edges 4 and 6 to define a central body portion 8 originally having a generally planar top surface 10 and a generally planar bottom surface 12. Integral lip portions 14 are formed in a conventional manner and extend outwardly and upwardly from the generally paral~el edges 4 and one of the generally parallel edges 6. If desired, the slip pallet 2 ~nay have diagonally cut corners 16 preventing edges 4 and 6 from intersecting.
A plurality of dimples 20 are formed in the top surface 10 so that a plurality of projections 22 extend downwardly from tha bottom surface 12. The dimples 20 have an lnner surface 24 that is a segment of a sphere and the projections 22 have an outer surface 26 which is a segment of a sphere.
30 The radius of the outer surface 26 is between about 0.1875 . .~ . - : . , . ~ ,. : :
- . : ~ ~. . ~ ., - , . . - .: . ~
~000137~
and 0.563 inch and the projections 22 have a depth, measured from the bottom surface 12 to the cre~t of the pro;ection 22, of between about 0.094 and 0.281 :lnch. The centers for the sphere6 of the outer surface3 26 are located above the 05 top surface 10 a distance equal to one-half of the radius minus the thickness between the planar portions of the top and bottom surfaces. In accordance with this invention, the depth of each projection 22 from the bottom surface 12 will be about one-half the radlus of the outer surface 26. The dimples 20 have centers which are spaced apart a distance of between about 0.75 and 1.50 inches and have a denslty of between about 0.75 and 2.00 per square inch and a surface area of between about 65 and 9Q per cent of the top surface 10. As illustrated in Fig. 1, the dimples 20 preferably lS extend in spaced apart parallel rows which rows are parallel to the opposite parallel edges 4 and perpendlcular to the opposite parallel edges 6. There are no dimples 20 in the lip portions 14 integral with the opposite edge portions 4, but there are dimples in the lip portion 14 integral with the one edge 6.
In Fig. 3, there is illustrated one dimple 20 of a central body portion 8 wherein the thickness of the plastic sheet between dlmples 20 ls about 0.051 lnch. The outer surface 26 of each of the dimples 20 has a radius of about 0.250 inch and are on spaced apart centers of about 1.00 inch. The center for the radius is located about 0.074 inch above the top surface 10. Each projection 22 has a depth of about 0.125 inch from the bottom surface 12 to the crest of the pro~ectlon 22. In Fig. 4, there i5 illustrated the same dimple 20 when a load of about 6,000 pounds per square foot : ~ . . : ~ . . i .
' . . . - : .~
- . : - ::
: . . .
; : .
~0~)0871 ls being supported by the central body portion 8. The depth of the pro~ection 22 has been decreased by about 0.042 inch 50 that the dimple 20 still has a depth of about 0.083 inch and is fully capable of supporting greater loads. A slip os pallet 2 having the dimples 20 as described above is capable of supporting loads up to about 10,000 pounds per square foot and still providing a cushioning effect.
In some instances, the use of a slip pallet 2 as illustrated in Figs. 1 - 4 present some problems in that there is a tendency for the slip pallet 2 to slide when being supported on a platen a~ lllustrated in u.s. Patent No. 3,776,145. In Fig. 5, there is illustrated a slip pallet 30 where a portion 32 of the outer surface 24 i8 relatively planar so that the portion 34 of the inner surface 26 is also relatively planar so as to provide a greater surface area for contact with the surface of the platen so as to provide greater frictional forces to prevent the sliding of the slip pallet 30 on the platen. The arcuate outer surface 36 is a frustum of a sphere having a 20 radius of between about 0.185 and 0.563 inch and wherein the center of the sphere is located a distance above the top surface 10 equal to one-half the radius minus the thickness between the planar portions of the top and bottom surfaces.
The portion 32 has a depth of between about 0.061 and 0.248 inch and the planar eurface 32 has a diameter of between about 0.1875 and 0.563 inch. In a preferred embodiment of the dimple of Fig. 5, the surface 32 has a diameter of about 0.25 inch and a depth of 0.092 inch. The arcuate outer surface 36 has a radius of about 0.25 wherein the center 38 .: : . . ~ . . :
': . .: ' , : ' , : . :
: : - - : ~ : . -: ' . :
,- ~ ,.. . . .
, ~ .
2t~)0871 of the sphere is located 0.074 inch above the bottom surface 12.
When the slip pallets of this invention are used in the shipment by truck or rail of filled beverage containers 05 packed in boxes, the weight on each slip pallet is between about 2,100 and 2,600 pounds per square foot. In normal practice, one slip pallet is loaded on top of another slip -pallet so that the load on the bottom slip pallet is between about 4,200 and 5,200 pounds per square foot. During shipment, the truck or rail car may periodically place additional loads on the slip pallets. During such additional loads, the pro~ections will be depressed in an amount relative to the additional load, but after the additional load has been removed, the pro~ections will resile to their configuration prior to the additional load.
The above-described preferred embodiment i8 based on a load on the bottom slip pallet of between about 4,200 and 5,200 pounds per square foot. The specific construction of the slip pallet with dimple~ for any desired load may be calculated in the following manner.
:
.
" '.
, .
)0~371 The conventional formula for the deflection of a sphere, illustrated in Fig. 6, wherein the dimple has been inverted for explanation purposes only, is:
deflection y = APR-16 ~ D
where D = Et 12(1- ~) R = outer radius of the dimple where r= poissons ratio A - 18 from the following table ~ 0 1 _ 2 3 4 5 6 A 1 .996 .935 .754 .406 .321 .210 wherein .7~ ~ 2 V3(1- r) x ~hjt E - Young's modulus of elasticity t = final thickness 5 where final thickness t = initial thickness (F) x ( c~ )~
t e r(F) ~2)~(R~ - d~
L D cos- d/RJ
where F = flat sheet thickness R = outer radius of the dimple d = di6tance R is spaced from centerllne of F
1 - diameter of the bottom portion B of the segment of the sphere c - circumference of the bottom portion s of the segment of the sphere for a semi-sphere d = 0 and D = 2R
t = ( )[D (~/2)¦
F R~ = F
D^ (~_ )L ( ~ )~
The conventional formula for P which the load distributlon, illustrated in Fig. 7, is:
P = load lbs/ft~l = load (C~) = lbs./dimple (12"/C)(12"/C) 144 30 where C is space between centers of the dimple. :~
: .~
;~00~871 While illustrative and presently preferred embodiments of the invention have been described in detail herein, it is to be understood that the inventive concepts may be otherwise variously embodied and employed and that the appended claims 05 are intended to be construed to include ~uch variations except insofar as limited by the prior art.
.
,:' .
,.
. :
.
Claims (11)
1. A shock absorbing pallet comprising:
a sheet of single ply plastic material having a thickness of between about 0.025 and 0.125 of an inch and a stiffness measurement in the range of between about 120,000 and 180,000 psi as determined by ASTM
specification D 790B;
said sheet having opposite pairs of parallel edges defining a central body portion for supporting a load;
an integral lip portion extending outwardly and upwardly from at least one of said edges;
said central body portion having a top surface and a bottom surface;
a plurality of spaced apart dimples in said top surface forming a plurality of spaced apart projections on said bottom surface thereof so that said dimples will provide a cushioning effect whenever an additional force is placed on said load; and said top and bottom surfaces being generally planar except for said dimples and projections.
a sheet of single ply plastic material having a thickness of between about 0.025 and 0.125 of an inch and a stiffness measurement in the range of between about 120,000 and 180,000 psi as determined by ASTM
specification D 790B;
said sheet having opposite pairs of parallel edges defining a central body portion for supporting a load;
an integral lip portion extending outwardly and upwardly from at least one of said edges;
said central body portion having a top surface and a bottom surface;
a plurality of spaced apart dimples in said top surface forming a plurality of spaced apart projections on said bottom surface thereof so that said dimples will provide a cushioning effect whenever an additional force is placed on said load; and said top and bottom surfaces being generally planar except for said dimples and projections.
2. A pallet as in claim 1 wherein:
said at least one lip portion has a top surface and a bottom surface; and a plurality of spaced apart dimples in said top surface of said at least one lip portion forming a plurality of spaced apart projections on said bottom surface thereof.
said at least one lip portion has a top surface and a bottom surface; and a plurality of spaced apart dimples in said top surface of said at least one lip portion forming a plurality of spaced apart projections on said bottom surface thereof.
3. A pallet as in claim 1 wherein:
said plurality of space apart dimples extend in spaced apart parallel rows having the same number of dimples and which rows are parallel to one pair of said opposite pairs of parallel edges and perpendicular to the other pair of said opposite pairs of parallel edges.
said plurality of space apart dimples extend in spaced apart parallel rows having the same number of dimples and which rows are parallel to one pair of said opposite pairs of parallel edges and perpendicular to the other pair of said opposite pairs of parallel edges.
4. A pallet as in claim 3 wherein:
said at least one lip portion has a top surface and a bottom surface; and a plurality of spaced apart dimples in said top surface of said at least one lip portion forming a plurality of spaced apart projections on said bottom surface thereof.
said at least one lip portion has a top surface and a bottom surface; and a plurality of spaced apart dimples in said top surface of said at least one lip portion forming a plurality of spaced apart projections on said bottom surface thereof.
5. A pallet as in claim 4 wherein:
each of said dimples in said at least one lip portion is in alignment with one of said spaced apart parallel rows of dimples.
each of said dimples in said at least one lip portion is in alignment with one of said spaced apart parallel rows of dimples.
6. A pallet as in claim 5 wherein said at least one lip portion comprises:
at least three lip portions.
at least three lip portions.
7. A pallet as in claim 1 wherein:
each of said dimples having a shape corresponding to a segment of a sphere having one portion thereof generally parallel to said top surface.
each of said dimples having a shape corresponding to a segment of a sphere having one portion thereof generally parallel to said top surface.
8. A pallet as in claim 7 wherein:
said plurality of dimples are located on spaced apart centers of between about 0.750 and 1.50 inches with each circular segment thereof having a radius of between about 0.1875 and 0.563 inch;
each projection has a depth of between about 0.094 and 0.281 inch from said bottom surface to the crest of said projection; and said dimples have a density of between about 0.75 and 2.00 per square inch.
said plurality of dimples are located on spaced apart centers of between about 0.750 and 1.50 inches with each circular segment thereof having a radius of between about 0.1875 and 0.563 inch;
each projection has a depth of between about 0.094 and 0.281 inch from said bottom surface to the crest of said projection; and said dimples have a density of between about 0.75 and 2.00 per square inch.
9. A pallet as in claim 8 wherein:
the surface areas of the outer surfaces of said projections comprises between about 60 and 95 per cent of the surface area of said top surface of said central body portion.
the surface areas of the outer surfaces of said projections comprises between about 60 and 95 per cent of the surface area of said top surface of said central body portion.
10. A pallet as in claim 1 wherein:
each of said projections having a shape corre-sponding to a frustum of a sphere wherein the planes forming said frustum are parallel to said bottom surface.
each of said projections having a shape corre-sponding to a frustum of a sphere wherein the planes forming said frustum are parallel to said bottom surface.
11. A pallet as in claim 1 and formed in accordance with the following formula:
deflection where R = outer radius of the dimple where .gamma. = poissons ratio A - is from the following table wherein E = Young's modulus of elasticity t = final thickness where final thickness t = initial thickness (F) x (?)?
where F = flat sheet thickness R = outer radius of the dimple d = distance R is spaced from centerline of F
l = diameter of the bottom portion of the segment of the sphere c = circumference of the bottom portion of the segment of the sphere for a semi-sphere d = 0 and D = 2R
The conventional formula for P which the load distribution, illustrated in Fig. 7, is:
where C is space between centers of the dimple.
deflection where R = outer radius of the dimple where .gamma. = poissons ratio A - is from the following table wherein E = Young's modulus of elasticity t = final thickness where final thickness t = initial thickness (F) x (?)?
where F = flat sheet thickness R = outer radius of the dimple d = distance R is spaced from centerline of F
l = diameter of the bottom portion of the segment of the sphere c = circumference of the bottom portion of the segment of the sphere for a semi-sphere d = 0 and D = 2R
The conventional formula for P which the load distribution, illustrated in Fig. 7, is:
where C is space between centers of the dimple.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US31032789A | 1989-02-13 | 1989-02-13 | |
| US310,327 | 1989-02-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2000871A1 true CA2000871A1 (en) | 1990-08-13 |
Family
ID=23202009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2000871 Abandoned CA2000871A1 (en) | 1989-02-13 | 1989-10-17 | Slip pallet with a cushioning effect |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2000871A1 (en) |
| WO (1) | WO1990009325A1 (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3231454A (en) * | 1961-04-14 | 1966-01-25 | Cadillac Products | Cushioning material |
| US3199468A (en) * | 1962-04-23 | 1965-08-10 | Charles M Sullivan | Nestable pallets |
| US3545249A (en) * | 1968-04-08 | 1970-12-08 | Dayton Reliable Tool & Mfg Co | Dimple and method of forming same |
| US3850116A (en) * | 1972-03-27 | 1974-11-26 | Bqp Ind Inc | Slip pallet reinforced with fillers |
| US3776145A (en) * | 1972-03-27 | 1973-12-04 | Best Quality Plastics Inc | Slip pallet |
| US3892902A (en) * | 1972-12-04 | 1975-07-01 | Preco Ind Ltd | Plastic panel pad construction for spacing concrete panels |
| US4042127A (en) * | 1975-10-30 | 1977-08-16 | Adolph Coors Company | Slip pallet and divider sheet |
| DE2625346A1 (en) * | 1976-06-04 | 1977-12-15 | Rockwell International Corp | Flexible component for mounting turbine - has flat material in which intersecting straight troughs are formed as spherical arches |
| JPS5746743A (en) * | 1980-08-29 | 1982-03-17 | Mitsui Petrochemical Ind | Corrugated cardboard sheet in synthetic resin |
| US4562718A (en) * | 1983-03-11 | 1986-01-07 | Precision Tool & Gauge Pty. Ltd. | Pallet and method of production |
-
1989
- 1989-10-17 CA CA 2000871 patent/CA2000871A1/en not_active Abandoned
-
1990
- 1990-01-30 WO PCT/US1990/000515 patent/WO1990009325A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990009325A1 (en) | 1990-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |