CA1120413A - Drum - Google Patents
DrumInfo
- Publication number
- CA1120413A CA1120413A CA000341091A CA341091A CA1120413A CA 1120413 A CA1120413 A CA 1120413A CA 000341091 A CA000341091 A CA 000341091A CA 341091 A CA341091 A CA 341091A CA 1120413 A CA1120413 A CA 1120413A
- Authority
- CA
- Canada
- Prior art keywords
- drum
- roller
- chimes
- chime
- leg
- 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
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
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/12—Cans, casks, barrels, or drums
- B65D1/14—Cans, casks, barrels, or drums characterised by shape
- B65D1/16—Cans, casks, barrels, or drums characterised by shape of curved cross-section, e.g. cylindrical
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Tyre Moulding (AREA)
- Artificial Filaments (AREA)
- Materials For Medical Uses (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides a blow-molded closed head drum made from a thermoplastic material comprising roller chimes of L-shaped cross section having a vertical leg and a hor-izontal leg and extending around the outer surface of the drum body adjacent to the head end and bottom end respectively, said roller chimes being formed directly from the drum body, the vert-ical roller chime leg in the head end region pointing upwardly and that in the bottom end region pointing downwardly to define roller chime recesses which are directed upwardly and downwardly respectively said recesses forming grooves which provide engage-ment surfaces for a gripping and transporting tool, wherein the roller chimes have a constant height and the horizontal roller chime legs have a uniform wall thickness around the periphery of the drum, whereas the thickness of the vertical roller chime legs decreases progressively around the periphery of the drum away from the seams thereof which correspond to the dividing planes of the mold used for making the drum.
The present invention provides a blow-molded closed head drum made from a thermoplastic material comprising roller chimes of L-shaped cross section having a vertical leg and a hor-izontal leg and extending around the outer surface of the drum body adjacent to the head end and bottom end respectively, said roller chimes being formed directly from the drum body, the vert-ical roller chime leg in the head end region pointing upwardly and that in the bottom end region pointing downwardly to define roller chime recesses which are directed upwardly and downwardly respectively said recesses forming grooves which provide engage-ment surfaces for a gripping and transporting tool, wherein the roller chimes have a constant height and the horizontal roller chime legs have a uniform wall thickness around the periphery of the drum, whereas the thickness of the vertical roller chime legs decreases progressively around the periphery of the drum away from the seams thereof which correspond to the dividing planes of the mold used for making the drum.
Description
3l3 rhe inv~l~tioll rclates to a hlown closed head drum made of L~lermoplastic material of the -type disclosed in co-pending CanadiaII ~pplication No. 319,769. The drum has roller chimes of L-shaped cross section which are formed directly from -the drum body and extend around the outer surface of the drum body adja-cent to the head end and bottom end, the vertlcal roller chime leg in the head end region pointlng upwards and that in -the bottom end region pointing downwards. The roller chime recesses, which are open upwards and downwards, from the grooves, which provide engagement surfaces for a gripping and transporting -tool.
This shape of the roller chimes has a special signifi-cance. The gripping tool for lifting and transporting the drum engages with its -tong arms under the horizontally outwardly direc-ted roller chime leg and behind the ver-tically upwardly extending roller chime leg. ~he total load of the drum is trans-mitted to the lower tong arm while the tong arm engaging behind the vertical roller chime leg prevents the drum from slipping off. Therefore, the vertical leg oE the upper roller chime must be directed upwardly and the ver-tical leg of the lower roller chime must be directed downwardly.
It is a known fact that the blowing mold used for pro-ducing such closed head arums consists of two mold halves wi-th the separating plane extending in the axial direction of the drum. The upper and lower region of each mold half is horizon-tally divided to provide sliding mold parts.
When the parison is lowered out of the extrusion head of the blowing machine, the mold halves are in the separated posi-tion so that -the parison can enter into the open blowing mold.
After the parison is lowered in the longitudinal direction into the mold the two mold halves are closed and the blowing process commences. Air flowing through the mandrel expands the parison so -that it presses against the inner wall of the closed mold and thus ass~llnes the shape of the drum. Tlle upper and lower mold parts of each mold are in ~he open position so that the material enteLs into recesses forrned by open upper and lower mold parts and fldnge rings open toward the i,nside ar~ thus formed.
The rnold parts are then closed. The mold parts are shaped -to provide the roller chime configuration and -the mater:ial shaped from the drum body is pressed in-to -the openiny. The roller chimes thus formed have an L-shaped cross section wi-th an outwardly extending horizon-tal leg and a vertical leg extend-ing either upwardly or downwardly.
Because of the varying material distribution in the drum body, difficulties occur in the formation of the roller chimes. In the region of the dividing planes in the mold the material of the e~truded parison is doubled when the mold halves are in the closed posi-tion. During tlle blowing process -Ihe parison is stretched. This means that the parison regions which move away from the s~ueezed seam become significantly -thinner.
In the formation of -the roller chimes in the upper and lower parts of each mold half different volumes of material are available. As a result, due to the larger amount of material in the region of the dividing seams the mold parts cannot close completely and a satisfactory formation of the roller chimes in the region of the thinner areas thus becomes impossible. secause of the gripping devices a satisfac-tory formation of the roller chimes is a prere~uisite.
According to an older proposal -the mold has a wave-like con-tour in the transverse dividing plane wi-th the wave troughs arranged in the region of a larger accumulation of ~he material and the wave crests loca-ted in the region of the lesser material accumulation. Therefore, the movable parts of each mold half can be closed completely without pressing the larger material volume into the interior of the drum at the same time guaranteeing a uniform hei(3ht of the vcLtical legs of the roller chirnes.
~ ccordi.ngl,y, the wall thickness of the horizontal rol'Ler chirne leg5 steadlly decreases from the region of the dividing sec~ls for an anyular ex-tent oE 90 until the horizontal leg thickness reaches a minimum corresponding to the thickness of the drum body and then increases steadily to the region of the .next mold dividing seam.
Therefore, it i.s -the aim oE the invention to provide a further arrangement for producing :roller chimes formed from the drum body and having an L-sl~aped cross section, taking into account the une~ual material distribution in the preform with uniform engaging groove.
According to the invention this aim is achieved in that in roller chimes of constan-t roller chime height and uniform wall thickness of the horizontal roller chime legs the wall thickness of the vertical roller chime legs, at uniform groove depth of the roller chimes throughout, decreases steadily corresponding to the material available from the region of the dividing seams in the mold for an angular extent of 90 until it reaches a minimum corresponding to the thickness of the drum body and then increases steadily to the region of the next mold dividing seam.
Accordingly the invention provides a blow-molded closed head drum made from a thermoplastic material comprising roller chimes of L-shaped cross section having a vertical leg and a horizontal leg and extending around the outer surface of the drum body adjacent to the head end and bot-tom end, respectively said roller chimes being formed directly from the drum body, the vertical roller chime leg in -the head end region pointing upwardly and that in the bottom end region pointing downwardly to define roller chime recesses which are directed upwardly and downwardly respectively said recesses forming grooves which provide engage-ment surfaces for a gripping and transporting tool, wherein the roller chiriles n.lve a cons~ant height and the horizontaL roller chime legs have a uniform wall thickness around the periphery of the clrum, whereas the -thickness of -the vertical roller chime legs decreases progressively around the periphery of the drum away from ~he seams thereof which correspond to -the dividing planes of -the mold used for makiny the drum.
The invention will now be described in moxe detail, by way of example only, with reEerence to the accornpanying drawing, in which:
Figure 1 shows a closed head drum having roller chimes in the head region and bottom region, and Figure 2 is a top view of the closed head drum shown in Figure 1.
The drum body 3 of the closed head drum i5 shown iII
Figure 1. The roller chimes 1 and 2 are Eormed radially ou-twardly from the drum body 3 by moving the mold parts ~not shown) in -the axial direction after the blowing process. From the horizontally outwardly directed roller chime legs 13 concerned the vertical legs 10 of the roller chimes 1 and 2 are provided. The vertical legs 10 are bent parallel to the drum axis in the direction towards the drum head 4 and drum bo-ttom 5. The drum head ~ and drum bot-tom 5 project beyond the roller chimes 1 and 2 so that the roller chimes are pro-tected when the drums are stacked, but sufficient space remains so that the handling of the drums cannot be obstructed. The bungs 6 and 7 are located in the recesses 8 in the drum head 4.
In the ou-ter region of the opposing drum sections the largest accumulations of ma-terial are in regions adjacent the dividing planes of the mold. In correspondence with the design of the surface of the blow mold, the wall thic~ness of the verti-cal roller chime legs 10 decreases steadily at uniform depth of the grooves 9I from the region of a mold dividing seam for an angular extent oE ~0~ until it :reaches a minimum corresponding to -the thickness o:E the drum body and then steadily increases to the region of the nex-t mold dividing seam (Fig 2)~
As is also evident from Fiyure 2, the horizon-tal roller chime leg 13 in -the reyion of the maximum ma-terial accumulation adjacen-t to -the bungs 6 and 7 is widened by inden-ta-tions 11 directed toward the inside of the drum.
In this manner, the excess accumulation which would otherwise occur in the reyion of the mold dividing pla~es is directed into the walls of the xoller chime legs 10. Consequently this excess material does not inhibit the closing of the mold sections in the longitudinal direction when the roller chimes are being formed.
This shape of the roller chimes has a special signifi-cance. The gripping tool for lifting and transporting the drum engages with its -tong arms under the horizontally outwardly direc-ted roller chime leg and behind the ver-tically upwardly extending roller chime leg. ~he total load of the drum is trans-mitted to the lower tong arm while the tong arm engaging behind the vertical roller chime leg prevents the drum from slipping off. Therefore, the vertical leg oE the upper roller chime must be directed upwardly and the ver-tical leg of the lower roller chime must be directed downwardly.
It is a known fact that the blowing mold used for pro-ducing such closed head arums consists of two mold halves wi-th the separating plane extending in the axial direction of the drum. The upper and lower region of each mold half is horizon-tally divided to provide sliding mold parts.
When the parison is lowered out of the extrusion head of the blowing machine, the mold halves are in the separated posi-tion so that -the parison can enter into the open blowing mold.
After the parison is lowered in the longitudinal direction into the mold the two mold halves are closed and the blowing process commences. Air flowing through the mandrel expands the parison so -that it presses against the inner wall of the closed mold and thus ass~llnes the shape of the drum. Tlle upper and lower mold parts of each mold are in ~he open position so that the material enteLs into recesses forrned by open upper and lower mold parts and fldnge rings open toward the i,nside ar~ thus formed.
The rnold parts are then closed. The mold parts are shaped -to provide the roller chime configuration and -the mater:ial shaped from the drum body is pressed in-to -the openiny. The roller chimes thus formed have an L-shaped cross section wi-th an outwardly extending horizon-tal leg and a vertical leg extend-ing either upwardly or downwardly.
Because of the varying material distribution in the drum body, difficulties occur in the formation of the roller chimes. In the region of the dividing planes in the mold the material of the e~truded parison is doubled when the mold halves are in the closed posi-tion. During tlle blowing process -Ihe parison is stretched. This means that the parison regions which move away from the s~ueezed seam become significantly -thinner.
In the formation of -the roller chimes in the upper and lower parts of each mold half different volumes of material are available. As a result, due to the larger amount of material in the region of the dividing seams the mold parts cannot close completely and a satisfactory formation of the roller chimes in the region of the thinner areas thus becomes impossible. secause of the gripping devices a satisfac-tory formation of the roller chimes is a prere~uisite.
According to an older proposal -the mold has a wave-like con-tour in the transverse dividing plane wi-th the wave troughs arranged in the region of a larger accumulation of ~he material and the wave crests loca-ted in the region of the lesser material accumulation. Therefore, the movable parts of each mold half can be closed completely without pressing the larger material volume into the interior of the drum at the same time guaranteeing a uniform hei(3ht of the vcLtical legs of the roller chirnes.
~ ccordi.ngl,y, the wall thickness of the horizontal rol'Ler chirne leg5 steadlly decreases from the region of the dividing sec~ls for an anyular ex-tent oE 90 until the horizontal leg thickness reaches a minimum corresponding to the thickness of the drum body and then increases steadily to the region of the .next mold dividing seam.
Therefore, it i.s -the aim oE the invention to provide a further arrangement for producing :roller chimes formed from the drum body and having an L-sl~aped cross section, taking into account the une~ual material distribution in the preform with uniform engaging groove.
According to the invention this aim is achieved in that in roller chimes of constan-t roller chime height and uniform wall thickness of the horizontal roller chime legs the wall thickness of the vertical roller chime legs, at uniform groove depth of the roller chimes throughout, decreases steadily corresponding to the material available from the region of the dividing seams in the mold for an angular extent of 90 until it reaches a minimum corresponding to the thickness of the drum body and then increases steadily to the region of the next mold dividing seam.
Accordingly the invention provides a blow-molded closed head drum made from a thermoplastic material comprising roller chimes of L-shaped cross section having a vertical leg and a horizontal leg and extending around the outer surface of the drum body adjacent to the head end and bot-tom end, respectively said roller chimes being formed directly from the drum body, the vertical roller chime leg in -the head end region pointing upwardly and that in the bottom end region pointing downwardly to define roller chime recesses which are directed upwardly and downwardly respectively said recesses forming grooves which provide engage-ment surfaces for a gripping and transporting tool, wherein the roller chiriles n.lve a cons~ant height and the horizontaL roller chime legs have a uniform wall thickness around the periphery of the clrum, whereas the -thickness of -the vertical roller chime legs decreases progressively around the periphery of the drum away from ~he seams thereof which correspond to -the dividing planes of -the mold used for makiny the drum.
The invention will now be described in moxe detail, by way of example only, with reEerence to the accornpanying drawing, in which:
Figure 1 shows a closed head drum having roller chimes in the head region and bottom region, and Figure 2 is a top view of the closed head drum shown in Figure 1.
The drum body 3 of the closed head drum i5 shown iII
Figure 1. The roller chimes 1 and 2 are Eormed radially ou-twardly from the drum body 3 by moving the mold parts ~not shown) in -the axial direction after the blowing process. From the horizontally outwardly directed roller chime legs 13 concerned the vertical legs 10 of the roller chimes 1 and 2 are provided. The vertical legs 10 are bent parallel to the drum axis in the direction towards the drum head 4 and drum bo-ttom 5. The drum head ~ and drum bot-tom 5 project beyond the roller chimes 1 and 2 so that the roller chimes are pro-tected when the drums are stacked, but sufficient space remains so that the handling of the drums cannot be obstructed. The bungs 6 and 7 are located in the recesses 8 in the drum head 4.
In the ou-ter region of the opposing drum sections the largest accumulations of ma-terial are in regions adjacent the dividing planes of the mold. In correspondence with the design of the surface of the blow mold, the wall thic~ness of the verti-cal roller chime legs 10 decreases steadily at uniform depth of the grooves 9I from the region of a mold dividing seam for an angular extent oE ~0~ until it :reaches a minimum corresponding to -the thickness o:E the drum body and then steadily increases to the region of the nex-t mold dividing seam (Fig 2)~
As is also evident from Fiyure 2, the horizon-tal roller chime leg 13 in -the reyion of the maximum ma-terial accumulation adjacen-t to -the bungs 6 and 7 is widened by inden-ta-tions 11 directed toward the inside of the drum.
In this manner, the excess accumulation which would otherwise occur in the reyion of the mold dividing pla~es is directed into the walls of the xoller chime legs 10. Consequently this excess material does not inhibit the closing of the mold sections in the longitudinal direction when the roller chimes are being formed.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A blow-molded closed head drum made from a thermo-plastic material comprising roller chimes of L-shaped cross section having a vertical leg and a horizontal leg and extending around the outer surface of the drum body adjacent to the head end and bottom end respectively, said roller chimes being formed directly from the drum body, the vertical roller chime leg in the head end region pointing upwardly and that in the bottom end region pointing downwardly to define roller chime recesses which are directed upwardly and downwardly respectively, said recesses forming grooves, which provide engagement surfaces for a gripping and transporting tool, wherein the roller chimes have a constant height and the horizontal roller chime legs have a uniform wall thickness around the periphery of the drum, whereas the thickness of the vertical roller chime legs decreases progressively around the peri-phery of the drum away from seams thereof which correspond to the dividing planes of the mold used for making the drum.
2. A drum according to claim 1 wherein the depth of the recesses is uniform around the drum periphery.
3. A drum according to claim 1 wherein the minimum wall thickness of the vertical legs occurs at a location which is angularly displaced by 90° with respect to said seams.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782852922 DE2852922A1 (en) | 1978-12-07 | 1978-12-07 | TANK |
| DEP2852922.8 | 1978-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1120413A true CA1120413A (en) | 1982-03-23 |
Family
ID=6056566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000341091A Expired CA1120413A (en) | 1978-12-07 | 1979-12-03 | Drum |
Country Status (14)
| Country | Link |
|---|---|
| JP (1) | JPS55116548A (en) |
| AT (1) | AT366638B (en) |
| BE (1) | BE876816A (en) |
| BR (1) | BR7905344A (en) |
| CA (1) | CA1120413A (en) |
| DE (1) | DE2852922A1 (en) |
| DK (1) | DK212379A (en) |
| FR (1) | FR2443388A1 (en) |
| GB (1) | GB2042462B (en) |
| IT (1) | IT1126549B (en) |
| NL (1) | NL7904030A (en) |
| NO (1) | NO791840L (en) |
| SE (1) | SE7904815L (en) |
| SU (1) | SU934904A3 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3533266A1 (en) * | 1984-11-06 | 1986-05-15 | Udo 5418 Selters Schütz | Vessel made of thermoplastic with bung |
| DE3526921A1 (en) * | 1985-07-27 | 1987-02-05 | Mauser Werke Gmbh | TANK |
| DE3708432A1 (en) * | 1987-03-16 | 1988-09-29 | Mauser Werke Gmbh | TANK |
| US6419109B1 (en) * | 2001-03-08 | 2002-07-16 | Russell-Stanley Corporation | Tighthead drum |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7600621U1 (en) * | 1976-01-12 | 1976-05-06 | Mauser Kg | Plastic barrel |
-
1978
- 1978-12-07 DE DE19782852922 patent/DE2852922A1/en not_active Withdrawn
-
1979
- 1979-05-22 NL NL7904030A patent/NL7904030A/en not_active Application Discontinuation
- 1979-05-23 DK DK212379A patent/DK212379A/en unknown
- 1979-06-01 SE SE7904815A patent/SE7904815L/en not_active Application Discontinuation
- 1979-06-01 NO NO791840A patent/NO791840L/en unknown
- 1979-06-06 BE BE0/195613A patent/BE876816A/en not_active IP Right Cessation
- 1979-06-21 AT AT0438879A patent/AT366638B/en not_active IP Right Cessation
- 1979-06-28 FR FR7916719A patent/FR2443388A1/en not_active Withdrawn
- 1979-08-20 BR BR7905344A patent/BR7905344A/en unknown
- 1979-10-01 SU SU792829003A patent/SU934904A3/en active
- 1979-11-28 GB GB7941035A patent/GB2042462B/en not_active Expired
- 1979-12-03 CA CA000341091A patent/CA1120413A/en not_active Expired
- 1979-12-06 JP JP15752379A patent/JPS55116548A/en active Granted
- 1979-12-07 IT IT27972/79A patent/IT1126549B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| NO791840L (en) | 1980-06-10 |
| SE7904815L (en) | 1980-06-08 |
| GB2042462B (en) | 1982-11-17 |
| NL7904030A (en) | 1980-06-10 |
| IT1126549B (en) | 1986-05-21 |
| ATA438879A (en) | 1981-09-15 |
| IT7927972A0 (en) | 1979-12-07 |
| JPS55116548A (en) | 1980-09-08 |
| BE876816A (en) | 1979-10-01 |
| AT366638B (en) | 1982-04-26 |
| SU934904A3 (en) | 1982-06-07 |
| FR2443388A1 (en) | 1980-07-04 |
| GB2042462A (en) | 1980-09-24 |
| DE2852922A1 (en) | 1980-06-19 |
| JPS5733215B2 (en) | 1982-07-15 |
| BR7905344A (en) | 1980-10-14 |
| DK212379A (en) | 1980-06-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |