CA1333055C - Knock-down bulk storage container - Google Patents
Knock-down bulk storage containerInfo
- Publication number
- CA1333055C CA1333055C CA 613412 CA613412A CA1333055C CA 1333055 C CA1333055 C CA 1333055C CA 613412 CA613412 CA 613412 CA 613412 A CA613412 A CA 613412A CA 1333055 C CA1333055 C CA 1333055C
- Authority
- CA
- Canada
- Prior art keywords
- container
- side walls
- sidewalls
- pair
- base
- 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.)
- Expired - Lifetime
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
- B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
- B65D77/04—Articles or materials enclosed in two or more containers disposed one within another
- B65D77/06—Liquids or semi-liquids or other materials or articles enclosed in flexible containers disposed within rigid containers
- B65D77/061—Liquids or semi-liquids or other materials or articles enclosed in flexible containers disposed within rigid containers the containers being mounted on a pallet
-
- 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
- B65D88/524—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 and one or more side walls being foldable along an additional median line
-
- 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
- B65D88/526—Large containers collapsible, i.e. with walls hinged together or detachably connected with detachable side walls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
Abstract
The present invention provides a knockdown bulk storage container, having a smooth flat interior for receiving a liquid containment bag. The container itself comprises a bottom wall, a pair of opposing first sidewalls has undercut outer ends and each of the second sidewalls has notched outer ends for slideably fitting in and out of the undercut outer ends of the first sidewalls to assemble and dismantle the container. When the container is dismantled, the second sidewalls are stored in a horizontal position vertically stacked relative to one another on the bottom wall and then the first sidewalls are folded inwardly down over the second sidewalls and the bottom wall.
Description
~ ~ FIELD OF THE INVE~TION 1 333~5~
1 The present invention relates to a knockdown bulk storage container which, when dismantled, is foldable to a flat stora~e position. The sidewalls of the bulk storage container are specifically constructed with reinforced materials for preventing flexing and breakdown of the container under load.
8ACKGROUND Of THE INVENTION ~;
There is a need in the marketplace for an extremely durable, heavy duty storage unit or container having a fully accesslble interior. One way of accessing the interior would be through the use of a foldable or collapsible wall, however, gencrally speaking, collapsible wall pallets are not designed -~
for heavy duty use.
Canadian Patent 1,197,796 issued December 10, 1985 to ~ ~ `
Cansda Post Corporation describes a collapsible wall pallet.
The pallet in this particular patent is designea to receive parcels and the like, visible through holes in the pallet wall and accessible by collapsing the pallet. However, the pallet of Canadlan Patent 1,197,796 is clearly not designed to receive bulk-loads such a dense liquid type load completely filling tne pallet. If such a load was placed in the Canada Post pallet, it would either completely spring the si~ewalls or bow them outwardly to the extent that the pallet would be totally misshaped. Furthermore, the materials from which the Canaaa Post pallet is made would take on a permanent misshaping ano theretore be unacceptable for future use.
~ .
, \
:
`-?6 ` - ";: 7~:
~ SJ-7~637 ~ 3~3~5~
.- There are other heavy duty pallets or containers presently available. Typically, there pallets are provided with intricate exterior ribbing sand the like for reinforcing of the pallet wall. However, the use of such intricate external ribbing is both costly and makes the pallet's - exterior extremely difficult to clean, taking away from the sanitary aspects of the pallet which is totally unacceptable uhere, for example, the pallet is used for handling food items and the like.
In other applications such as the storage of hazardous chemicals, it is extremely important that the container for the chemicals be extremely stable. Conventionally, a typical chemical waste container is in the form of a metallic drum which ia becoming more and more unacceptable because of rapid drum deterioration and leakage of the waste material from the drum. There is nothing presently available in the away of a bulk atorage unit having a plastic construction capable of atoring hazardous chemicals.
SUMMARY OF THF. PRF:~;F.NT TNVF NTION
The present invention provides a knockdown bulk atoraqe container specifically designed to overcome the drawbacka raiaed above, particularly with respect to accepting high load requirements without deformation or bowing of the container. In particular, the knockdown bulk ; ;
storage container of the present invention ha~ a amooth flat interior to receive a liquid containment bag and comprises a ~cinforced bottom wall, a pair of opposing first sidewalls nd a pair of opposing second sidewalls. All of the sidewalla are also reinforced.
133305~
SJ-7637-8~ - 3 - 2~3b/D0~7b Each of the first sidewalls includes undercut outer ends anb each of the second walls has notcheb outer enbs for sliaeaDly fitt~ng in and out of the undercut outer ends of the first sidewalls to assemble and dismantle the container. When the container is dismantled, the second sidewalls are storeable in a horizontal position vertically stacked relative to one another on the bottom wall and the first sidewalls are foldable inwardly down over the second sidewalls when they are storea on the bottom wall.
ûne of the key features of the present invention is the undercut interlock between the first and second sidewalls.
Through the use of an undercut on the first side wall which borders the notched end of the second side wall to both the inside and the outside of the container, the second sidewall is trapped against either inward or outward movement. This is particularly important in the handling of chemical waste material where the container must be reinforced against both outward and inward breaking of the sidewalls.
BRIEF DESCRIPTIûN OF THE DRAWINGS
The above as well as other advantages and features of the present invention will be described in greater detail according to the preferred embodiments of the present invention in which;
Figure 1 is a perspective view of a bulk storage container according to a preferred embodiment of the present invention;
l 3~30S5 S~~- SJ-7637-89 - 4 - 22Y3B/0087B
~) Figure 2 is a view similar to Figure 1 with the top of the bulk storage container being removed and showing an internal bag within the container;
Figure 2A is a sectional view of the interlock between opposing sidewalls according to a preferred embodiment of the invention;
Figures 3 through 6 are furhter perspective vlews of the bulk storage container of Figure 2 in various stages of dismantling and folding;
Figure 7 is a perspective view of the container of Figure 2 when completely folded and when vertically stackea with other like containers shown in phantom in Figure 7;
Figure 8 is a partially sectioned perspective view of the bulk storage container of Figure 2 with the bag removea ana showing the wall construction of the container.
DETAIiED DESCRIPTIûN ACCORDING TO THE PREFERREU
EMBODIMENTS OF THE PRESENT INVENTION:
Figure 1 shows a bulk storage container generally indicated at 1. The main components of the storage container are a reinforced bottom wall 3, a first pair of upstanaing opposing and reinforced sidewalls 7 and a second pair of upstanding and reinforced opposing si~ewalls 25 better seen in Figures 2 and 3 of the drawings. The container is also provided with a top 35 as seen in Figure 1.
The container of the present invention is aesigned to hold heavy loads with little or no deflection or bowing of the container. For example, when the container is fitted with a 3,000 pound load, there is essentially no outward flexing of the container walls. Furthermore, this is done while making the container of a knockdown construction so that it can be 1 333~55 - ~J-7637-89 - 5 - 2293~ 7b 1 folded to the position as shown in Figures 6 and 7 of the drawings when not in use.
All of the above is provided as a result of the reinforced wall construction and the interlock between the upright sidewalls of the container. This interlock is best seen in Figure 2A of the drawings.
More particularly, each of the first upright sidewalls 7 includes an outer end undercut region generally indicatea at 13. This undercut end region is specifically providea with an undercut groove 15 which in the embodiment shown is a dove-tai groove. Dove-tail groove 15 is bordered to the inside oy wall material 19 and to the outside by wall material 17.
Each of tne second upright walls 25 includes an outer end undercut notch 27 which slideably locks with the undercut slot 15 as shown in Figure 2A. This interlock at all four corners of the container provides for a vertical sliding interfit of the four upright container walls. To guard against a premature release, each of the container walls 7 is providea with a small notch 21 while each of the container walls 25 includes a slide lock 31 wnich locks into its respective notch 21 as shown for example in Figure 2 of the drawings.
Again referring to Figure 2A, it will be seen that the undercut interlock between the sidewalls is such that walls 25 are blocked against outward deflection by the material 17 to the outside of the interlock and against inward deflection by the material 19 to the inside of the interlock. In addition, sidewalls 7 are foldable when the container is dismantled but 1333Q~
~J-7637-89 - 6 - 2~3~/00~7 1 premature outward folding of the walls 7 is once again prevented by the unaercut interlock with tne notchea enas 27 of wa~is-25.
As a further reinforcing support for tne walls 25, tne bottom or bottom wall 3 of the pallet is provided with grooves or channels 4 extenoing between walls 7 at opposite ends of tne pallet bottom. The lower edge 26 of wall 25 as seen in Figure 3, drops down into groove 4 when the container is fully assembled.
In order to dismantle the container, slide locks 31 are released and each of the walls 25 are pulled upwardly out of their respective undercut interlocks. To facilitate the lifting of walls 25, they are each provided with an upper ena outwardly extending lip 29 wnich acts as a grip at the upper end of the wall. In addition, this lip 29 as well as a corresponding lip 23 on each of the sidewalls 7, provides a snap or catch onto WhiCh the top 35 locks again adding to the stability of the container.
Each of the sidewalls 7 is hingealy connected at 9 to the bottom wall 3 and also includes a center hinge 11. With the sidewalls 25 lifted up and out of their interlock, as shown in Figure 4 of the drawings, each of the sidewalls 7 can then be folded as shown in Figures 5 and 6 of the drawings. Here it should be noted that the size of the bottom wall 3 relative to the sidewalls 25 is such that sidewalls 25 are storea in a horizontal position stacked vertically relative to one another directly atop the bottom wall as shown in Figure 4 of the drawings. Each of the sidewalls 7 then folds back upon itself ~ ~33Q5~
- SJ-7637-89 - 7 - 229~/u0~7~
('' .
and additionally folds down on top of the sidewalls 25 storeo on the bottom wall 3. This provides for a very neat ana compact overall storage of the container as shown in Figure 6 of the drawings and as further shown in Figure 7 of the drawings where it can be seen that the container actually folds down to about 1/4 of its assembled size so that with aaditional folded containers la, lb and lc stacked atop container 1, the ovérall stack still only reaches the height of a single assembled container. Note that the containers la, lb and lc indicated by the phantom lines, do not actually represent the shape of the containers but merely show their height in a folded condition.
For purposes of hanaling container 1 in either its assembled or its folded condition, the bottom wall 3 is provided with fork lift openings 5 exposeb to all sides of tne bottom wall. This enables the container whether loaded or unloaded to be quickly and easily moved from place to plaCe by a conventional fork lift truck.
In order to further add to the stability of the container, it is preferably made with a reinforced wall construction best seen having reference to Figure 8 of the drawings. In particular, each of the sidewalls as well as the bottom wall includes an outer plastic surface generally indicated at 33 and an inner core 35 around which the plastic surface is formed. According to a preferred emboaiment of the present invention, the outer plastic surface is formeo by a plastic material selected from any of the materials known as an engineered resin. Two particularly suitable plastics are polycarbonate and polypropylene. By way of example an engineered resin which is extremely durable while at the same 13330~S
SJ-7637-89 - 8 - 22Y~b/U0~7~
-time being reasonable in cost is sold under the traae mark AZDEL by Techno Polymers of Detroit.
Again, according to a preferred embodiment of the present invention, the inner core is actually made from a wooa material and a particularly suitable selection is oriented strand board of about 1" thickness. Again, orientea strano board is very reasonable in cost while being extremely strong.
As is known in the industry oriented strand board comprises scraps of wood which are compressed to form a board construction. The compression of the oriented strana boara makes it high in density and extremely strong.
Each of the sidewalls and the bottom wall is formeu by flowing the plastic material around the wood core. The wood core itself is provided with a plurality of small openings ~7 which in the industry are referred to as kiss-offs. The plastic material flows through these kiss-offs and bonds to itself directly through the wood core. In addition, the wood core has a certain amount of outer surface porosity and the plastic material flows directly into and bonds with the wood core in the pore. Therefore, once each of the walls has been completely formed, although it has a composite construction, this composite construction is in fact unitary or solid in nature, i.e. the plastic laminate cannot, after formation, be separated from the wood core because of the kiss-offs and the mechanical interlock between the porous surface of the wooa core and the plastic outer surface.
The use of an engineered resin provides extreme advantages to the container construction. Engineerea resins I 33305~
_ SJ-7637-89 - 9 - 2293B/00~7B
~`
1 have essentially no creep factor and are uneffecteo by ultraviolet light. Therefore, the colour of the container is substantially uneffected by exposure to sunlight and the shape of the container is maintained even unaer extremely heavy loaas.
Engineered resins are extremely impact resistant to the point of being ballistic proof or at least substantially ballistic proof. Again, this is very important when considering that the container might well be subject to blows or impacts sustained in normal everyday use and it is further important that those blows or impacts not penetrate the container particularly, if it is used to handle dangerous products such as chemical waste and the like.
Although Figure 2 of the drawings show the use of a bag B for holding liquid tvpe products in the container, it is to be appreciated that the bag is not required when the container is used to receive products of a solid as opposea to to a liquid nature.
2û
A further feature of the present invention is that both the inner and outer surfaces of the container are solid and essentially flat enhancing the ability to clean the container, particularly important for~handling fooa products.
This is to be contrasted to a much more conventional ano ribbeo or pocketed construction which is difficult to clean and which provides traps for dirt and contamination.
Although various preferred embodiments of the 3û invention have been described in detail, it will be appreciatea SJ-7637-89 - 10 - 2~93~/00~7 1 by those skilled in the art that variations may be made without departing from the spirit of the invention or the scope of tne appended claims.
1 The present invention relates to a knockdown bulk storage container which, when dismantled, is foldable to a flat stora~e position. The sidewalls of the bulk storage container are specifically constructed with reinforced materials for preventing flexing and breakdown of the container under load.
8ACKGROUND Of THE INVENTION ~;
There is a need in the marketplace for an extremely durable, heavy duty storage unit or container having a fully accesslble interior. One way of accessing the interior would be through the use of a foldable or collapsible wall, however, gencrally speaking, collapsible wall pallets are not designed -~
for heavy duty use.
Canadian Patent 1,197,796 issued December 10, 1985 to ~ ~ `
Cansda Post Corporation describes a collapsible wall pallet.
The pallet in this particular patent is designea to receive parcels and the like, visible through holes in the pallet wall and accessible by collapsing the pallet. However, the pallet of Canadlan Patent 1,197,796 is clearly not designed to receive bulk-loads such a dense liquid type load completely filling tne pallet. If such a load was placed in the Canada Post pallet, it would either completely spring the si~ewalls or bow them outwardly to the extent that the pallet would be totally misshaped. Furthermore, the materials from which the Canaaa Post pallet is made would take on a permanent misshaping ano theretore be unacceptable for future use.
~ .
, \
:
`-?6 ` - ";: 7~:
~ SJ-7~637 ~ 3~3~5~
.- There are other heavy duty pallets or containers presently available. Typically, there pallets are provided with intricate exterior ribbing sand the like for reinforcing of the pallet wall. However, the use of such intricate external ribbing is both costly and makes the pallet's - exterior extremely difficult to clean, taking away from the sanitary aspects of the pallet which is totally unacceptable uhere, for example, the pallet is used for handling food items and the like.
In other applications such as the storage of hazardous chemicals, it is extremely important that the container for the chemicals be extremely stable. Conventionally, a typical chemical waste container is in the form of a metallic drum which ia becoming more and more unacceptable because of rapid drum deterioration and leakage of the waste material from the drum. There is nothing presently available in the away of a bulk atorage unit having a plastic construction capable of atoring hazardous chemicals.
SUMMARY OF THF. PRF:~;F.NT TNVF NTION
The present invention provides a knockdown bulk atoraqe container specifically designed to overcome the drawbacka raiaed above, particularly with respect to accepting high load requirements without deformation or bowing of the container. In particular, the knockdown bulk ; ;
storage container of the present invention ha~ a amooth flat interior to receive a liquid containment bag and comprises a ~cinforced bottom wall, a pair of opposing first sidewalls nd a pair of opposing second sidewalls. All of the sidewalla are also reinforced.
133305~
SJ-7637-8~ - 3 - 2~3b/D0~7b Each of the first sidewalls includes undercut outer ends anb each of the second walls has notcheb outer enbs for sliaeaDly fitt~ng in and out of the undercut outer ends of the first sidewalls to assemble and dismantle the container. When the container is dismantled, the second sidewalls are storeable in a horizontal position vertically stacked relative to one another on the bottom wall and the first sidewalls are foldable inwardly down over the second sidewalls when they are storea on the bottom wall.
ûne of the key features of the present invention is the undercut interlock between the first and second sidewalls.
Through the use of an undercut on the first side wall which borders the notched end of the second side wall to both the inside and the outside of the container, the second sidewall is trapped against either inward or outward movement. This is particularly important in the handling of chemical waste material where the container must be reinforced against both outward and inward breaking of the sidewalls.
BRIEF DESCRIPTIûN OF THE DRAWINGS
The above as well as other advantages and features of the present invention will be described in greater detail according to the preferred embodiments of the present invention in which;
Figure 1 is a perspective view of a bulk storage container according to a preferred embodiment of the present invention;
l 3~30S5 S~~- SJ-7637-89 - 4 - 22Y3B/0087B
~) Figure 2 is a view similar to Figure 1 with the top of the bulk storage container being removed and showing an internal bag within the container;
Figure 2A is a sectional view of the interlock between opposing sidewalls according to a preferred embodiment of the invention;
Figures 3 through 6 are furhter perspective vlews of the bulk storage container of Figure 2 in various stages of dismantling and folding;
Figure 7 is a perspective view of the container of Figure 2 when completely folded and when vertically stackea with other like containers shown in phantom in Figure 7;
Figure 8 is a partially sectioned perspective view of the bulk storage container of Figure 2 with the bag removea ana showing the wall construction of the container.
DETAIiED DESCRIPTIûN ACCORDING TO THE PREFERREU
EMBODIMENTS OF THE PRESENT INVENTION:
Figure 1 shows a bulk storage container generally indicated at 1. The main components of the storage container are a reinforced bottom wall 3, a first pair of upstanaing opposing and reinforced sidewalls 7 and a second pair of upstanding and reinforced opposing si~ewalls 25 better seen in Figures 2 and 3 of the drawings. The container is also provided with a top 35 as seen in Figure 1.
The container of the present invention is aesigned to hold heavy loads with little or no deflection or bowing of the container. For example, when the container is fitted with a 3,000 pound load, there is essentially no outward flexing of the container walls. Furthermore, this is done while making the container of a knockdown construction so that it can be 1 333~55 - ~J-7637-89 - 5 - 2293~ 7b 1 folded to the position as shown in Figures 6 and 7 of the drawings when not in use.
All of the above is provided as a result of the reinforced wall construction and the interlock between the upright sidewalls of the container. This interlock is best seen in Figure 2A of the drawings.
More particularly, each of the first upright sidewalls 7 includes an outer end undercut region generally indicatea at 13. This undercut end region is specifically providea with an undercut groove 15 which in the embodiment shown is a dove-tai groove. Dove-tail groove 15 is bordered to the inside oy wall material 19 and to the outside by wall material 17.
Each of tne second upright walls 25 includes an outer end undercut notch 27 which slideably locks with the undercut slot 15 as shown in Figure 2A. This interlock at all four corners of the container provides for a vertical sliding interfit of the four upright container walls. To guard against a premature release, each of the container walls 7 is providea with a small notch 21 while each of the container walls 25 includes a slide lock 31 wnich locks into its respective notch 21 as shown for example in Figure 2 of the drawings.
Again referring to Figure 2A, it will be seen that the undercut interlock between the sidewalls is such that walls 25 are blocked against outward deflection by the material 17 to the outside of the interlock and against inward deflection by the material 19 to the inside of the interlock. In addition, sidewalls 7 are foldable when the container is dismantled but 1333Q~
~J-7637-89 - 6 - 2~3~/00~7 1 premature outward folding of the walls 7 is once again prevented by the unaercut interlock with tne notchea enas 27 of wa~is-25.
As a further reinforcing support for tne walls 25, tne bottom or bottom wall 3 of the pallet is provided with grooves or channels 4 extenoing between walls 7 at opposite ends of tne pallet bottom. The lower edge 26 of wall 25 as seen in Figure 3, drops down into groove 4 when the container is fully assembled.
In order to dismantle the container, slide locks 31 are released and each of the walls 25 are pulled upwardly out of their respective undercut interlocks. To facilitate the lifting of walls 25, they are each provided with an upper ena outwardly extending lip 29 wnich acts as a grip at the upper end of the wall. In addition, this lip 29 as well as a corresponding lip 23 on each of the sidewalls 7, provides a snap or catch onto WhiCh the top 35 locks again adding to the stability of the container.
Each of the sidewalls 7 is hingealy connected at 9 to the bottom wall 3 and also includes a center hinge 11. With the sidewalls 25 lifted up and out of their interlock, as shown in Figure 4 of the drawings, each of the sidewalls 7 can then be folded as shown in Figures 5 and 6 of the drawings. Here it should be noted that the size of the bottom wall 3 relative to the sidewalls 25 is such that sidewalls 25 are storea in a horizontal position stacked vertically relative to one another directly atop the bottom wall as shown in Figure 4 of the drawings. Each of the sidewalls 7 then folds back upon itself ~ ~33Q5~
- SJ-7637-89 - 7 - 229~/u0~7~
('' .
and additionally folds down on top of the sidewalls 25 storeo on the bottom wall 3. This provides for a very neat ana compact overall storage of the container as shown in Figure 6 of the drawings and as further shown in Figure 7 of the drawings where it can be seen that the container actually folds down to about 1/4 of its assembled size so that with aaditional folded containers la, lb and lc stacked atop container 1, the ovérall stack still only reaches the height of a single assembled container. Note that the containers la, lb and lc indicated by the phantom lines, do not actually represent the shape of the containers but merely show their height in a folded condition.
For purposes of hanaling container 1 in either its assembled or its folded condition, the bottom wall 3 is provided with fork lift openings 5 exposeb to all sides of tne bottom wall. This enables the container whether loaded or unloaded to be quickly and easily moved from place to plaCe by a conventional fork lift truck.
In order to further add to the stability of the container, it is preferably made with a reinforced wall construction best seen having reference to Figure 8 of the drawings. In particular, each of the sidewalls as well as the bottom wall includes an outer plastic surface generally indicated at 33 and an inner core 35 around which the plastic surface is formed. According to a preferred emboaiment of the present invention, the outer plastic surface is formeo by a plastic material selected from any of the materials known as an engineered resin. Two particularly suitable plastics are polycarbonate and polypropylene. By way of example an engineered resin which is extremely durable while at the same 13330~S
SJ-7637-89 - 8 - 22Y~b/U0~7~
-time being reasonable in cost is sold under the traae mark AZDEL by Techno Polymers of Detroit.
Again, according to a preferred embodiment of the present invention, the inner core is actually made from a wooa material and a particularly suitable selection is oriented strand board of about 1" thickness. Again, orientea strano board is very reasonable in cost while being extremely strong.
As is known in the industry oriented strand board comprises scraps of wood which are compressed to form a board construction. The compression of the oriented strana boara makes it high in density and extremely strong.
Each of the sidewalls and the bottom wall is formeu by flowing the plastic material around the wood core. The wood core itself is provided with a plurality of small openings ~7 which in the industry are referred to as kiss-offs. The plastic material flows through these kiss-offs and bonds to itself directly through the wood core. In addition, the wood core has a certain amount of outer surface porosity and the plastic material flows directly into and bonds with the wood core in the pore. Therefore, once each of the walls has been completely formed, although it has a composite construction, this composite construction is in fact unitary or solid in nature, i.e. the plastic laminate cannot, after formation, be separated from the wood core because of the kiss-offs and the mechanical interlock between the porous surface of the wooa core and the plastic outer surface.
The use of an engineered resin provides extreme advantages to the container construction. Engineerea resins I 33305~
_ SJ-7637-89 - 9 - 2293B/00~7B
~`
1 have essentially no creep factor and are uneffecteo by ultraviolet light. Therefore, the colour of the container is substantially uneffected by exposure to sunlight and the shape of the container is maintained even unaer extremely heavy loaas.
Engineered resins are extremely impact resistant to the point of being ballistic proof or at least substantially ballistic proof. Again, this is very important when considering that the container might well be subject to blows or impacts sustained in normal everyday use and it is further important that those blows or impacts not penetrate the container particularly, if it is used to handle dangerous products such as chemical waste and the like.
Although Figure 2 of the drawings show the use of a bag B for holding liquid tvpe products in the container, it is to be appreciated that the bag is not required when the container is used to receive products of a solid as opposea to to a liquid nature.
2û
A further feature of the present invention is that both the inner and outer surfaces of the container are solid and essentially flat enhancing the ability to clean the container, particularly important for~handling fooa products.
This is to be contrasted to a much more conventional ano ribbeo or pocketed construction which is difficult to clean and which provides traps for dirt and contamination.
Although various preferred embodiments of the 3û invention have been described in detail, it will be appreciatea SJ-7637-89 - 10 - 2~93~/00~7 1 by those skilled in the art that variations may be made without departing from the spirit of the invention or the scope of tne appended claims.
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A knock down bulk storage container having a base, a pair of first side walls and a pair of second side walls, said pair of said first side walls being hingedly secured to said base and said pair of second side walls being releasably secured by a sliding interlock to both said pair of first side walls and to said base for a knock down assembly of said container in which said pair of second side walls are released from both said pair of first side walls and said base and then stored horizontally on said base and said pair of first side walls fold down over said pair of second side walls, all of said side walls having a solid construction with smooth plastic interior surfaces on said side walls, said sliding interlock comprising outer edge undercut channels in one of said pairs of side walls and undercut notched ends in the other pair of side walls and each of said second side walls having a bottom edge fitted into a channel provided in said base beneath each of said second side walls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 613412 CA1333055C (en) | 1989-09-27 | 1989-09-27 | Knock-down bulk storage container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 613412 CA1333055C (en) | 1989-09-27 | 1989-09-27 | Knock-down bulk storage container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1333055C true CA1333055C (en) | 1994-11-15 |
Family
ID=4140700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 613412 Expired - Lifetime CA1333055C (en) | 1989-09-27 | 1989-09-27 | Knock-down bulk storage container |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1333055C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2408997A (en) * | 2003-12-09 | 2005-06-15 | Corrosion Prot Systems Ltd | Collapsible water storage tank |
| US8342347B2 (en) | 2009-10-08 | 2013-01-01 | Nova Chemicals (International) S.A. | Collapsible container with a sliding lock feature |
| WO2013028100A1 (en) * | 2011-08-22 | 2013-02-28 | Slepko Yurij Nikolaevich | Device for unloading cars |
| US8408411B2 (en) | 2007-07-11 | 2013-04-02 | Nova Chemicals (International) S.A. | Collapsible plastic container |
| US8770421B2 (en) | 2010-01-28 | 2014-07-08 | Nova Chemicals (International) S.A. | Collapsible refuse bin |
| WO2021080509A1 (en) * | 2019-10-22 | 2021-04-29 | The Executor Of The Estate Of Lam Choon Sen David | A chemical box |
-
1989
- 1989-09-27 CA CA 613412 patent/CA1333055C/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2408997A (en) * | 2003-12-09 | 2005-06-15 | Corrosion Prot Systems Ltd | Collapsible water storage tank |
| GB2408997B (en) * | 2003-12-09 | 2008-05-28 | Corrosion Prot Systems Ltd | Liquid storage tank |
| US8408411B2 (en) | 2007-07-11 | 2013-04-02 | Nova Chemicals (International) S.A. | Collapsible plastic container |
| US8342347B2 (en) | 2009-10-08 | 2013-01-01 | Nova Chemicals (International) S.A. | Collapsible container with a sliding lock feature |
| US8770421B2 (en) | 2010-01-28 | 2014-07-08 | Nova Chemicals (International) S.A. | Collapsible refuse bin |
| WO2013028100A1 (en) * | 2011-08-22 | 2013-02-28 | Slepko Yurij Nikolaevich | Device for unloading cars |
| WO2021080509A1 (en) * | 2019-10-22 | 2021-04-29 | The Executor Of The Estate Of Lam Choon Sen David | A chemical box |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |