CA2068293C - Open top plastic drum with plastic cover - Google Patents
Open top plastic drum with plastic coverInfo
- Publication number
- CA2068293C CA2068293C CA 2068293 CA2068293A CA2068293C CA 2068293 C CA2068293 C CA 2068293C CA 2068293 CA2068293 CA 2068293 CA 2068293 A CA2068293 A CA 2068293A CA 2068293 C CA2068293 C CA 2068293C
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- CA
- Canada
- Prior art keywords
- cover
- neck
- wall
- assembly
- drum
- 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
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Abstract
A plastic drum assembly includes a plastic body with an open top, terminated in a neck having two annular flexing zones, a plastic cover, and a ring for securing the cover to the body. The cover may also have flexing regions corresponding to the flexing regions on the neck. The flexing regions cooperate to permit the neck and the cover to flex in a hinging action in presence of an impact on the body to ensure that the cover is not separated, thereby preventing spillage.
Description
2~68293 TITr,E OF ~TrR I~NVRNTIQN
AN OPEN TOP PI A8T rC DRUM WIT~ PLA~TIC COVER
BA~ KV~Iwl) oF ~rTTR TNV~N~ION
This invention pertains to an all plastic drum of the 5 kind having an open top and a cover, and more particularly to a plastic drum designed for safely transporting various powdery materials and the like.
Open top plastic drums provided with round plastic covers are very desirable as a means of transporting various types of 10 solid materials, which may be granular, in the form of powders, as well as semi-liquids or pastes. Depending on the nature of the material to be transported, these drums are subject to different governmental regulations. I~rums for regulated materials, i.e.
materials dangerous or hazardous to public health, are regulated by 15 the United States Department of Transportation (DOT) as well as by the United Nations. The DOT requires that a drum for transporting a regulated material must be able to withstand the so-called drop test. This test consi6ts of loading a drum with 400 pounds of sand, orienting the drum so that a vertical line passes through a 20 top edge, the center of the drum, and a bottom edge, and then dropping the drum straight down, along the line, for a distance of 4 feet, onto a cement floor, so the impact is absorbed by the bottom edge. If the drum spills any of its contents, it has failed *
~ 2~68293 the test. This test simulates a worst-case condition for accidentally dropping a drum from a truck bed or a fork lift.
Drums for transporting non-regulated materials, such as adhesives, pastes, waxes, et:c. are subject to other regulations 5 promulgated by various and i~lternational organizations, including the United Nations. One such test, the tip-over test, consists of filling a drum with a heavy m~lterial, such as water, closing it and then tipping it over on a concrete floor on its side. Again, if the drum spills its contents" it fails the test.
As far as we know, the plastic drums presently available are not capable of passing both of these tests. The present drums fail to pass the tests because the impact generated during the tests forces the sidewalls of the drum to distort from a nr~min~lly cylindrical configuration to an oval or elliptical configuration.
15 The round cover mounted on the drum is not able to conform to this drastic change and parts of the cover separate from the drum at least temporarily allowing the drum contents to spill.
~UMMaRY oF THE INVENTION
In view of the above-mentioned disadvantage of the prior 20 art it is desired to provide an open top plastic drum and cover assembly which are suitable for carrying both regulated and non-regulated materials by passing the drop and the tip-over test.
Another obj ective is to provide a plastic drum and a cover assembly wherein the cover is not knocked off during the 25 handling and stacking of the drum.
~ 2~68293 Yet another objective is to provide a drum and cover assembly which is easy and; n~ncive to manufacture.
Other objectives alld advantages of this invention shall become apparent from the following description. A plastic drum 5 assembly constructed in acco]-dance with this invention includes a plastic generally cylindrical body with a neck forming an open top, said neck including first and second axially spaced body hinging means; a plastic cover for closing said open top; and cover securing means for securing said plastic cover to said body to form 10 a seal for said drum assembl~. The first and second body hinging means cooperating to isolate said neck when said sealed drum assembly is subjected to impact to maintain said seal thereby avoiding spillage.
BRIEF DESCRI ~TION oF T~IE DRAWINGS
These and other objects and advantages of the invention will become apparent UpO]I reading the following detailed description and upon referring to the drawings in which:
Figure 1 shows a front elevational view of a closed drum assembly constructed in accordance with this invention;
Figure 2 shows an exploded view of the top portion of the drum assembly of Figure 1;
Figure 3 shows a t~p view of the cover of Figures 1 and 2 ;
Figure 4 shows an exploded side-sectional view of the top portion with the ring opened; and 2a68293 Figure 5 shows a side-sectional view of the top portion with the ring closed.
While the invention will be de6cribed in conjunction with an example embodiments, it will be understood that it is not 5 intended to limit the invention to such embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by 1:he appended claims.
DET~Tr r!n DE8CRIPTION OF TT~r~ INVr'NTION
In the drawings, similar features have been given similar reference numerals.
A drum 10 constructed in accordance with this invention includes a generally cylindrical plastic body 12 with an open top def ined by an opening 14 . Th,e opening 14 is closed by a cover 16, 15 secured to body 12 by a ring 18.
As seen in Figures 1 and 2, body 12 is made integrally of a single piece of a plastic material, for example by molding. More particularly, body 12 includes an integral bottom portion 20 and a cylindrical sidewall 22. Approximately at equal distance from the 20 top and bottom, sidewall 22 is formed with two rolling hoops 24, 26. These hoops reinforce the drum and allow the drum to be rolled on a flat surface.
Above hoop 26, sidewall 22 narrows down to form a neck 28. As shown in Figure 4, the drum neck includes a downward 25 ~conical wall 30, a lower cylindrical wall 32,~an upward conical ~ 5 ~ 20682g3 wall 34 and an upper cylindrical wall 36. Importantly, the tranE3ition 38 between wallE~ 30 and 32 defines a lower annular flexible reglon extending around the body 12. Similarly, the tranE~ition 40 between wallE3 32 and 34 defines an upper annular flexible region ~tPn~1n~ around the body 12. These two regionE;
act like hingeE3 and allow the neck 28 to flex slightly.
In addition the outer diameter of wall 36 is smaller than the outer diameter of the main portion of E3idewall 22. The neck 28 lO iE3 terminated by a smooth annular flat surface 42 diE3posed in a plane normal to the longitudinal axiE3 of the drum. The radial width of annular surface g2 i~ E3ubE3t;~nt;~1 ly larger than the thickne~s of E3idewall 22. ThiE3 E3urface may be made for example by forming the drum body 12 together with a cylindrical wall 44 with a groove 46 E3eparating wall 44 from body 22. After the body 22 and wall 44 are integrally molded, wall 4g can be cut of f with a E3harp bladed object, like a knife, and diE3carded, leaving a smooth Eiurface 42. In the prior art, cuE3tomarily, the drum body wa8 formed with a cylindrical wall, but without the groove 46. After molding, the drum body waE3 separated from the wall by E3awing. The E3awing produced 1ln~t~hle shavingE3 of plastic particles, and in addition resulted in an uneven top E3urface for the drum body.
Cover 16 ~n~-lllrl~ a central diE3k 50 which may be E31ightly conical, aE3 E3hown, with a dependent E3kirt 52 extending downwardly.
The tranE3ition between skirt 52 and diE3k 50 is formed so that it defines another annular flexing region 54. The cover then riSeE3 upwardly and outwardly through a conical wall 56 t~rm;n~t~n~ with an inverted U-E3haped member 58. The tranE3ition between diE3k 50 or X
_~ _ 2~68~93 skirt 52 and wall 56 defines yet a fourth annular flexible region 60 .
Inside U-shaped member 58 there is provided a gasket 62 formed for example of polyurethane. The U-shaped member 58 is 5 constructed and arranged to receive the upper surface 42 of neck 28. Moreover U-shaped member has a depth about the same as the height of wall 36 80 that when the cover 16 is secured to the drum body 12, the gasket not only covers the flat surface 42 but also flows around it and partially covers the surface 36 as well as the 10 inner surface of mouth 14.
Ring 18 has a generally C-shaped cross-section defined by an upper section 70 disposed generally in a plane normal to the longitudinal axis of the drum, a vertical wall 72, and a conical section 74 disposed at an allgle which approximates the angle of wall 56 on the drum neck 28. As seen in Figure 2, the ring 18 is also provided with a lockin~ r-~hnni ~n 76 with a swing arm 78 .
Details of this locking ~ hi~ni ~n are described in more detail in commonly assigned U.S. Patent No. 4,101,156. In the position shown in Figure 2, the ring 18 is fully extended peripherally. In this position, its inner diameter is large enough so that ring 18 fits around cover 16, as shown somewhat exaggerated in Figure 4.
The plastic drum described above is used as follows.
First the open top body 12 is filled up with a solid, semi-solid, or liquid material. Once body 12 is filled, cover 16 is placed on top of opening 14 50 that the upper end of the body 12 is received in the U-shaped member 58. Next, ring 18 is placed around cover 16 and arm 78 is swung in the direction shown by arrow 80 (Figure 2) .. .. . . _ _ .. .... . . . .. . . . _ _ _ _ _ _ _ _ .. _ ~ 20~829~
to close and lock the ring lk. As the ring 18 closes around cover 16, ring wall 72 comes into contact with wall 34 and rides along this wall 34 downward as well as radially inward in a camming action. This camming action also forces the cover 16 downward 5 against the top surface 42. As a result, the gasket is forced to spread along top surface 42 and around the inside and outside surface of body 22 thereby provided three sealing surfaces, as shown in Figure 5. The sealed drum shown in Figure 1 is now ready for shipping. The lock-type ring shown in the Figures may be used 10 for non-regulated materials.
Instead of the loc k-type ring shown in the Figures, a bolt-type ring is used for materials regulated by the U.N. and the DOT . A bolt-type ring is described in commonly assigned U. S .
Patent No. 4,134,609.
This sealed drum has a number of advantages. The neck 28, cover 16 and ring 18 are constructed and arranged so that in the sealed configuration, the wall 72 of ring 16 is disposed radially inward by a distance r from the wall 22 of body 12.
During shipping, for example if the shipping takes place in a truck over rough terrain, filled drums are bounced around and knocked against each other. For other types of drums, this may cause the cover of one drum to collide with another drum and pop off. In the present drum assembly, the cover 16 and ring 18 are recessed and protected from rough handling.
Another advantage is the shape of the neck, and more particularly the sizes and shapes of walls 32 and 34. These two walls cooperate to allow the drum to be lifted by a fork lift with -8- 20~293 a parrot beak ~-hi3n;qm. The parrot mechanism i9 pushed under wall 34 adjacent wall 32 to lift the filled drum onto or off of a truck bed. Thus walls 32, 34 provide a means of handling the drum using merhi:ln1 71~fl equlpment . Tnt P ~ te wall 56 extends radially 5 outwardly ~or coupling to a mechanized drum handle thus providing another means for lifting the drum using m-~rh~n~7ed equipment.
The drum can be gized to hold for example from 30 to 55 gallons or more, as required.
As mentioned above, a ma~or problem with prior art lO plastic drums has been the drop and tip-over tests. We found that a drum as described above can pass these tests because of the aLLdlly~ ts of the flexible regions and the size and shape of the neck 28, cover 16 and ring 18. As shown in Figure 5, in the sealed configuration, the ~lexible zones 38, 40 on the body 12 are approximately aligned with ~lexible zones 54, 60 on the cover 16.
When the drum is dropped, for example during the drop test or the tip-over te9t, the hinging effect of the flexible zones permit the main portion of the body 12 to flex and distort, while the neck portion 28 remains relativel~r undistorted. Even if the neck 28 is 20 distorted slightly, the cover 16 is similarly distorted because of the hinglng effect of flexlble regions 54, 60. In this manner the neck remains f irmly sealed to the cover 16, and the gasket 62 is not crimped thereby r~lnt~ jn;n~ the seal. Because of the close contact between the wall 32 and cover 16, dhring the tlp-over test, 25 the neck 19 relnforced by wall 52 on the cover. Durlng impact, X, 206~2g3 - 8a -external forces travel from the neck to dlsk 50. The neck i~ also reinforced and stiffened by the cooperation between wall 36 on the neck and 72 on the rirg 18. The height of the~e wall~ ensure that S impact i~ ~pread over a larger area.
X
20~8293 g Obviously numerous modifications may be made to this invention without departing from its 6cope as defined in the appended claims.
Thus it is apparent that there has been provided in 5 accordance with the invention that fully satisfies the objects, aims and advantages set forth above. While the invention has been described in con~unction with a specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing 10 description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and broad scope of th~ invention.
AN OPEN TOP PI A8T rC DRUM WIT~ PLA~TIC COVER
BA~ KV~Iwl) oF ~rTTR TNV~N~ION
This invention pertains to an all plastic drum of the 5 kind having an open top and a cover, and more particularly to a plastic drum designed for safely transporting various powdery materials and the like.
Open top plastic drums provided with round plastic covers are very desirable as a means of transporting various types of 10 solid materials, which may be granular, in the form of powders, as well as semi-liquids or pastes. Depending on the nature of the material to be transported, these drums are subject to different governmental regulations. I~rums for regulated materials, i.e.
materials dangerous or hazardous to public health, are regulated by 15 the United States Department of Transportation (DOT) as well as by the United Nations. The DOT requires that a drum for transporting a regulated material must be able to withstand the so-called drop test. This test consi6ts of loading a drum with 400 pounds of sand, orienting the drum so that a vertical line passes through a 20 top edge, the center of the drum, and a bottom edge, and then dropping the drum straight down, along the line, for a distance of 4 feet, onto a cement floor, so the impact is absorbed by the bottom edge. If the drum spills any of its contents, it has failed *
~ 2~68293 the test. This test simulates a worst-case condition for accidentally dropping a drum from a truck bed or a fork lift.
Drums for transporting non-regulated materials, such as adhesives, pastes, waxes, et:c. are subject to other regulations 5 promulgated by various and i~lternational organizations, including the United Nations. One such test, the tip-over test, consists of filling a drum with a heavy m~lterial, such as water, closing it and then tipping it over on a concrete floor on its side. Again, if the drum spills its contents" it fails the test.
As far as we know, the plastic drums presently available are not capable of passing both of these tests. The present drums fail to pass the tests because the impact generated during the tests forces the sidewalls of the drum to distort from a nr~min~lly cylindrical configuration to an oval or elliptical configuration.
15 The round cover mounted on the drum is not able to conform to this drastic change and parts of the cover separate from the drum at least temporarily allowing the drum contents to spill.
~UMMaRY oF THE INVENTION
In view of the above-mentioned disadvantage of the prior 20 art it is desired to provide an open top plastic drum and cover assembly which are suitable for carrying both regulated and non-regulated materials by passing the drop and the tip-over test.
Another obj ective is to provide a plastic drum and a cover assembly wherein the cover is not knocked off during the 25 handling and stacking of the drum.
~ 2~68293 Yet another objective is to provide a drum and cover assembly which is easy and; n~ncive to manufacture.
Other objectives alld advantages of this invention shall become apparent from the following description. A plastic drum 5 assembly constructed in acco]-dance with this invention includes a plastic generally cylindrical body with a neck forming an open top, said neck including first and second axially spaced body hinging means; a plastic cover for closing said open top; and cover securing means for securing said plastic cover to said body to form 10 a seal for said drum assembl~. The first and second body hinging means cooperating to isolate said neck when said sealed drum assembly is subjected to impact to maintain said seal thereby avoiding spillage.
BRIEF DESCRI ~TION oF T~IE DRAWINGS
These and other objects and advantages of the invention will become apparent UpO]I reading the following detailed description and upon referring to the drawings in which:
Figure 1 shows a front elevational view of a closed drum assembly constructed in accordance with this invention;
Figure 2 shows an exploded view of the top portion of the drum assembly of Figure 1;
Figure 3 shows a t~p view of the cover of Figures 1 and 2 ;
Figure 4 shows an exploded side-sectional view of the top portion with the ring opened; and 2a68293 Figure 5 shows a side-sectional view of the top portion with the ring closed.
While the invention will be de6cribed in conjunction with an example embodiments, it will be understood that it is not 5 intended to limit the invention to such embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by 1:he appended claims.
DET~Tr r!n DE8CRIPTION OF TT~r~ INVr'NTION
In the drawings, similar features have been given similar reference numerals.
A drum 10 constructed in accordance with this invention includes a generally cylindrical plastic body 12 with an open top def ined by an opening 14 . Th,e opening 14 is closed by a cover 16, 15 secured to body 12 by a ring 18.
As seen in Figures 1 and 2, body 12 is made integrally of a single piece of a plastic material, for example by molding. More particularly, body 12 includes an integral bottom portion 20 and a cylindrical sidewall 22. Approximately at equal distance from the 20 top and bottom, sidewall 22 is formed with two rolling hoops 24, 26. These hoops reinforce the drum and allow the drum to be rolled on a flat surface.
Above hoop 26, sidewall 22 narrows down to form a neck 28. As shown in Figure 4, the drum neck includes a downward 25 ~conical wall 30, a lower cylindrical wall 32,~an upward conical ~ 5 ~ 20682g3 wall 34 and an upper cylindrical wall 36. Importantly, the tranE3ition 38 between wallE~ 30 and 32 defines a lower annular flexible reglon extending around the body 12. Similarly, the tranE~ition 40 between wallE3 32 and 34 defines an upper annular flexible region ~tPn~1n~ around the body 12. These two regionE;
act like hingeE3 and allow the neck 28 to flex slightly.
In addition the outer diameter of wall 36 is smaller than the outer diameter of the main portion of E3idewall 22. The neck 28 lO iE3 terminated by a smooth annular flat surface 42 diE3posed in a plane normal to the longitudinal axiE3 of the drum. The radial width of annular surface g2 i~ E3ubE3t;~nt;~1 ly larger than the thickne~s of E3idewall 22. ThiE3 E3urface may be made for example by forming the drum body 12 together with a cylindrical wall 44 with a groove 46 E3eparating wall 44 from body 22. After the body 22 and wall 44 are integrally molded, wall 4g can be cut of f with a E3harp bladed object, like a knife, and diE3carded, leaving a smooth Eiurface 42. In the prior art, cuE3tomarily, the drum body wa8 formed with a cylindrical wall, but without the groove 46. After molding, the drum body waE3 separated from the wall by E3awing. The E3awing produced 1ln~t~hle shavingE3 of plastic particles, and in addition resulted in an uneven top E3urface for the drum body.
Cover 16 ~n~-lllrl~ a central diE3k 50 which may be E31ightly conical, aE3 E3hown, with a dependent E3kirt 52 extending downwardly.
The tranE3ition between skirt 52 and diE3k 50 is formed so that it defines another annular flexing region 54. The cover then riSeE3 upwardly and outwardly through a conical wall 56 t~rm;n~t~n~ with an inverted U-E3haped member 58. The tranE3ition between diE3k 50 or X
_~ _ 2~68~93 skirt 52 and wall 56 defines yet a fourth annular flexible region 60 .
Inside U-shaped member 58 there is provided a gasket 62 formed for example of polyurethane. The U-shaped member 58 is 5 constructed and arranged to receive the upper surface 42 of neck 28. Moreover U-shaped member has a depth about the same as the height of wall 36 80 that when the cover 16 is secured to the drum body 12, the gasket not only covers the flat surface 42 but also flows around it and partially covers the surface 36 as well as the 10 inner surface of mouth 14.
Ring 18 has a generally C-shaped cross-section defined by an upper section 70 disposed generally in a plane normal to the longitudinal axis of the drum, a vertical wall 72, and a conical section 74 disposed at an allgle which approximates the angle of wall 56 on the drum neck 28. As seen in Figure 2, the ring 18 is also provided with a lockin~ r-~hnni ~n 76 with a swing arm 78 .
Details of this locking ~ hi~ni ~n are described in more detail in commonly assigned U.S. Patent No. 4,101,156. In the position shown in Figure 2, the ring 18 is fully extended peripherally. In this position, its inner diameter is large enough so that ring 18 fits around cover 16, as shown somewhat exaggerated in Figure 4.
The plastic drum described above is used as follows.
First the open top body 12 is filled up with a solid, semi-solid, or liquid material. Once body 12 is filled, cover 16 is placed on top of opening 14 50 that the upper end of the body 12 is received in the U-shaped member 58. Next, ring 18 is placed around cover 16 and arm 78 is swung in the direction shown by arrow 80 (Figure 2) .. .. . . _ _ .. .... . . . .. . . . _ _ _ _ _ _ _ _ .. _ ~ 20~829~
to close and lock the ring lk. As the ring 18 closes around cover 16, ring wall 72 comes into contact with wall 34 and rides along this wall 34 downward as well as radially inward in a camming action. This camming action also forces the cover 16 downward 5 against the top surface 42. As a result, the gasket is forced to spread along top surface 42 and around the inside and outside surface of body 22 thereby provided three sealing surfaces, as shown in Figure 5. The sealed drum shown in Figure 1 is now ready for shipping. The lock-type ring shown in the Figures may be used 10 for non-regulated materials.
Instead of the loc k-type ring shown in the Figures, a bolt-type ring is used for materials regulated by the U.N. and the DOT . A bolt-type ring is described in commonly assigned U. S .
Patent No. 4,134,609.
This sealed drum has a number of advantages. The neck 28, cover 16 and ring 18 are constructed and arranged so that in the sealed configuration, the wall 72 of ring 16 is disposed radially inward by a distance r from the wall 22 of body 12.
During shipping, for example if the shipping takes place in a truck over rough terrain, filled drums are bounced around and knocked against each other. For other types of drums, this may cause the cover of one drum to collide with another drum and pop off. In the present drum assembly, the cover 16 and ring 18 are recessed and protected from rough handling.
Another advantage is the shape of the neck, and more particularly the sizes and shapes of walls 32 and 34. These two walls cooperate to allow the drum to be lifted by a fork lift with -8- 20~293 a parrot beak ~-hi3n;qm. The parrot mechanism i9 pushed under wall 34 adjacent wall 32 to lift the filled drum onto or off of a truck bed. Thus walls 32, 34 provide a means of handling the drum using merhi:ln1 71~fl equlpment . Tnt P ~ te wall 56 extends radially 5 outwardly ~or coupling to a mechanized drum handle thus providing another means for lifting the drum using m-~rh~n~7ed equipment.
The drum can be gized to hold for example from 30 to 55 gallons or more, as required.
As mentioned above, a ma~or problem with prior art lO plastic drums has been the drop and tip-over tests. We found that a drum as described above can pass these tests because of the aLLdlly~ ts of the flexible regions and the size and shape of the neck 28, cover 16 and ring 18. As shown in Figure 5, in the sealed configuration, the ~lexible zones 38, 40 on the body 12 are approximately aligned with ~lexible zones 54, 60 on the cover 16.
When the drum is dropped, for example during the drop test or the tip-over te9t, the hinging effect of the flexible zones permit the main portion of the body 12 to flex and distort, while the neck portion 28 remains relativel~r undistorted. Even if the neck 28 is 20 distorted slightly, the cover 16 is similarly distorted because of the hinglng effect of flexlble regions 54, 60. In this manner the neck remains f irmly sealed to the cover 16, and the gasket 62 is not crimped thereby r~lnt~ jn;n~ the seal. Because of the close contact between the wall 32 and cover 16, dhring the tlp-over test, 25 the neck 19 relnforced by wall 52 on the cover. Durlng impact, X, 206~2g3 - 8a -external forces travel from the neck to dlsk 50. The neck i~ also reinforced and stiffened by the cooperation between wall 36 on the neck and 72 on the rirg 18. The height of the~e wall~ ensure that S impact i~ ~pread over a larger area.
X
20~8293 g Obviously numerous modifications may be made to this invention without departing from its 6cope as defined in the appended claims.
Thus it is apparent that there has been provided in 5 accordance with the invention that fully satisfies the objects, aims and advantages set forth above. While the invention has been described in con~unction with a specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing 10 description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and broad scope of th~ invention.
Claims (16)
1. A plastic drum and cover assembly comprising:
a plastic cylindrical body having a cylindrical body portion with a body portion radius and a closed bottom, a neck forming an open top and coupling means for coupling said neck to said body portion, said coupling means including a cylindrical wall, an upwardly and outwardly extending conical wall connecting said cylindrical wall to said neck, a first annular hinge defined by the junction of the cylindrical wall and the upwardly and outwardly extending conical wall, a downwardly and outwardly extending conical wall connecting said cylindrical wall to said body portion, a second annular hinge defined by the juncture of the cylindrical wall and the downwardly and outwardly extending conical wall, said cylindrical wall and hinges having radii smaller than said body portion radius;
said annular hinges completely extending about the cylindrical wall providing substantially uniform degree of flexing at any point thereon upon impact;
a plastic cover for closing said open top and being radially recessed from said body side wall, covering securing means for securing said plastic cover to said body to form a seal;
said cover including a central disk and the cover securing means being disposed peripherally about said central disk for coupling said cover to said body, said cover including upper and lower cover hinging means for flexing said cover in the presence of said impact to permit the cover and neck to cooperate with one another in maintaining the seal on the top, said upper and lower cover hinging means being located contemporaneously with respect to said first and second annular hinges when said cover is closed on said body; and the hinges cooperating to isolate said neck from said body when said cover is secured by said securing means and said body is subjected to impact.
a plastic cylindrical body having a cylindrical body portion with a body portion radius and a closed bottom, a neck forming an open top and coupling means for coupling said neck to said body portion, said coupling means including a cylindrical wall, an upwardly and outwardly extending conical wall connecting said cylindrical wall to said neck, a first annular hinge defined by the junction of the cylindrical wall and the upwardly and outwardly extending conical wall, a downwardly and outwardly extending conical wall connecting said cylindrical wall to said body portion, a second annular hinge defined by the juncture of the cylindrical wall and the downwardly and outwardly extending conical wall, said cylindrical wall and hinges having radii smaller than said body portion radius;
said annular hinges completely extending about the cylindrical wall providing substantially uniform degree of flexing at any point thereon upon impact;
a plastic cover for closing said open top and being radially recessed from said body side wall, covering securing means for securing said plastic cover to said body to form a seal;
said cover including a central disk and the cover securing means being disposed peripherally about said central disk for coupling said cover to said body, said cover including upper and lower cover hinging means for flexing said cover in the presence of said impact to permit the cover and neck to cooperate with one another in maintaining the seal on the top, said upper and lower cover hinging means being located contemporaneously with respect to said first and second annular hinges when said cover is closed on said body; and the hinges cooperating to isolate said neck from said body when said cover is secured by said securing means and said body is subjected to impact.
2. The drum assembly of claim 1 wherein said cover includes a gasket.
3. The drum assembly of claim 1 wherein said cover includes an intermediate wall extending between said peripheral cover securing means and said central disk with the central disk being disposed radially adjacent the cylindrical wall.
4. The assembly of claim 3 wherein said cover securing means comprises an inverted U-shaped member.
5. The assembly of claim 4 further comprising a gasket disposed in said U-shaped member.
6. The assembly of claim 3 wherein said intermediate wall forms an upper cover flexing region with said disk to cooperate in defining the cover hinging means.
7. The assembly of claim 3 wherein said intermediate wall extends radially outwardly for coupling to a mechanized drum handling mechanism used for lifting the drum.
8. The assembly of claim 1 wherein said cylindrical wall forms a lower cover flexing region to cooperate in defining the cover hinging means.
9. The assembly of claim 8 wherein said neck coupling means includes a first and a second annular flexing region disposed at opposite ends of the cylindrical wall and said lower cover hinging means is disposed approximately on the same level as said second annular flexing region on said body when said cover is closed on said body.
10. The assembly of claim 1 wherein said cylindrical wall has a thickness, and wherein said neck is terminated by an annular surface disposed in a plane normal to the longitudinal axis of the cylindrical body position, that surface having a radial width substantially larger than said cylindrical wall thickness.
11. The assembly of claim 1 wherein said neck includes a second vertical wall disposed above said cylindrical wall, with cover securing means including a ring dimensioned to fit about said second vertical wall.
12. The assembly of claim 11 wherein said ring includes an inclined ring wall, said inclined wall cooperating with the upwardly and outwardly extending conical wall to force said cover downward as said ring is tightened around said neck and said cover.
13. The assembly of claim 12 wherein said ring has a C-shaped cross-section.
14. The assembly of claim 1 wherein said neck includes a second cylindrical wall disposed above the first defined cylindrical wall.
15. The assembly of claim 13 wherein the ring has split ends, a locking mechanism coupled with the split ends for permitting the ring to assume an open position at which the ring may be placed about the cover and neck and a closed position at which it embraces a major part of the neck to tighten and lock the cover about the entire neck to seal the cover to the neck.
16. The assembly of claim 9 wherein the first and second annular flexing regions are approximately aligned with the respective upper and lower cover hinging means when said cover is closed on said body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US69778691A | 1991-05-09 | 1991-05-09 | |
| US697,786 | 1991-05-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2068293A1 CA2068293A1 (en) | 1992-11-10 |
| CA2068293C true CA2068293C (en) | 1996-10-22 |
Family
ID=24802535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2068293 Expired - Lifetime CA2068293C (en) | 1991-05-09 | 1992-05-08 | Open top plastic drum with plastic cover |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2068293C (en) |
-
1992
- 1992-05-08 CA CA 2068293 patent/CA2068293C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2068293A1 (en) | 1992-11-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |