US3264396A - Method of injection molding a tote case - Google Patents

Method of injection molding a tote case Download PDF

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Publication number
US3264396A
US3264396A US335739A US33573964A US3264396A US 3264396 A US3264396 A US 3264396A US 335739 A US335739 A US 335739A US 33573964 A US33573964 A US 33573964A US 3264396 A US3264396 A US 3264396A
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US
United States
Prior art keywords
tote
case
cases
injection molding
tote case
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
Application number
US335739A
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English (en)
Inventor
Robert L Beesley
John W Mighton
Rudolph H Matthias
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Priority to US335739A priority Critical patent/US3264396A/en
Priority to DED30357U priority patent/DE1928957U/de
Priority to GB51539/64A priority patent/GB1067738A/en
Priority to NL6415231A priority patent/NL6415231A/xx
Priority to BE657908D priority patent/BE657908A/xx
Priority to FR895A priority patent/FR1420818A/fr
Priority to US544326A priority patent/US3362576A/en
Application granted granted Critical
Publication of US3264396A publication Critical patent/US3264396A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65D21/00—Nestable, stackable or joinable containers; Containers of variable capacity
    • B65D21/02—Containers specially shaped, or provided with fittings or attachments, to facilitate nesting, stacking, or joining together
    • B65D21/0209—Containers specially shaped, or provided with fittings or attachments, to facilitate nesting, stacking, or joining together stackable or joined together one-upon-the-other in the upright or upside-down position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
    • 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
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • 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
    • B65D21/00—Nestable, stackable or joinable containers; Containers of variable capacity
    • B65D21/02—Containers specially shaped, or provided with fittings or attachments, to facilitate nesting, stacking, or joining together
    • B65D21/0209—Containers specially shaped, or provided with fittings or attachments, to facilitate nesting, stacking, or joining together stackable or joined together one-upon-the-other in the upright or upside-down position
    • B65D21/0213—Containers presenting a continuous stacking profile along the upper or lower edge of at least two opposite side walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7134—Crates, e.g. for bottles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S220/00—Receptacles
    • Y10S220/15—Plastic bottle crates

Definitions

  • This invention relates generally to tote cases and, more particularly, relates to tote cases particularly suited for handling products such as paperboard and plastic liquid containing packages, and to the method of making such cases.
  • Prior plastic tote cases fail to provide satisfactory stacking of a plurality of such cases as well as fail to provide a case bottom structure having adequate drainage facilities and yet being of sufiicient strength to endure harsh treatment.
  • Yet another object of the present invention is to provide a bottom structure for a tote case which is of such a configuration that when it is formed, uniform controlled material distribution in parts can be had even though it be of a generally square or other rectangular configuration.
  • the present invention thus resides in an improved plastic tote case having all the advantages of the prior cases plus improved stacking characteristics due to an offset shoulder and outwardly extending protuberances. Recessed internal corners are provided in the case which substantially prevent corner fitting of rectangularly shaped cartons. Also comprehended is an improved bottom construction which provides adequate drainage while retaining substantial strength. Co-extensive with the above is a method for forming the bottom construction which method provides for a uniform control of material distribution in the molding thereof.
  • FIGURE 1 is a side view of a tote case constructed according to the principles of the subject invention, all sides being substantially alike;
  • FIGURE 2 is a top plan view thereof
  • FIGURE 3 is a bottom view thereof
  • FIGURE 4 is an enlarged fragmentary section of two tote cases stacked together, the bottom of an upper tote case stacked upon the top of a lower tote case;
  • FIGURE 5 is a bottom plan view of a modified form of tote case having an elongated rather than a square bottom configuration.
  • Tote case or container is illustrated in FIGURES 1-4 as having a substantially square bottom 11 with side walls 12 extending upwardly therefrom. It is best molded from a lightweight plastic material such as high impact polystyrene or rigid polyethylene, or of other plastic materials having like characteristics.
  • the four side walls 12 of container 10 preferably have a corrugated crosssection formed by undulations 14 to provide increased stacking rigidity, improved control of warpage, minimal moisture condensation, and faster cool-down of the container and contents.
  • undulations 14 have been found especially useful in thin walled plastic cases. Corners 15, formed by adjacent side walls 12, are recessed so as to prevent a tight mated fit with corners of cartons, or the like, contained within tote case 10.
  • each side wall 12 has hand opening 16 with a lip or raised flange 18 around the periphery thereof to provide a reinforced grip.
  • a thickened portion 20 which concludes in downwardly extending corner portions 22, the latter containing holes 24 which can be engaged by hooks or the like when the cases are pulled manually or are moved by heavy equipment.
  • each side wall 12 merges into bottom 28 by way of a recessed shoulder portion 26 which gives a generally flat vertical surface 30 with bumps or rounded tapered protuberances 32 located in spaced relationship therealong, as best seen in FIGS. 1 and 4.
  • Protuberances 32 act as spacers juxtapositionable with the inner surface 34 about the top of a stacked tote case of a similar configuration.
  • protuberances 32 extend from the surface 30 a distance so as to snugly engage inner surface 34 to give added rigidity to the stacked cases. It can readily be seen that shoulder 26 rests upon the upper peripheral edge 36 of the case therebelow.
  • FIGURE 3 especially shows that the bottom 18 of tote case 10 is formed about a plurality of cut-outs 38 which provide the improved drainage capabilities of the case, both when it holds containers and when it is in a plant, such as a dairy, being cleaned.
  • the cut-outs 38 are defined by crossed planar portion 40 which is in turn reinforced by downwardly extending ridges 42 along approximately all of its surftce.
  • the T-shaped cross section construction formed by planar portion 40 and downwardly extending rib 42 give improved rigidity.
  • Cut-outs 38 are generally in the form of parallelograms except about the periphery of the bottom where they are in the form of triangles approximately one-half the size of the parallelograms.
  • the crosses formed by planar portion 4t) comprise at least linear diagonals extending generally across said bottom wall between opposite corners thereof.
  • plastic material is injected into a mold in equal directions from the center of the bottom through a gate (not shown).
  • the location of the gate is defined in FIG- URE 3 by central aperture 44 which is surrounded by thickened peripheral flange 46.
  • plastic flows from the center portion, under pressure, in a flow pattern substantially as defined by surfaces 40' and ribs 42, which pattern makes the distance from the orifice of the gate to peripheral points around the sides, such as 48, 50, 52, etc., the same.
  • the distance through which the material must flow i.e. from the gate to the corners or the side walls, is the same in every instance.
  • Such uniform controlled material distribution in molded cases having square or rectangular bases eliminates the prior problems caused by warping, poor weld lines, packing stress, and all the other inherent characteristics in prior art designs.
  • FIGURE 5 That an elongated rectangular base for a'tote case can likewise have uniform material distribution when molded through a central gate is illustrated by FIGURE 5.
  • the flow distance from central aperture 54 of case 56 to the corners, such as corner 58, is the same as the flow distance to any point on the sides, such as to points 6%) or 62, the distance being defined by ribs 64.
  • Ribs 64 in this instance define cut-outs 66 in the shape of parallelograms about the center and triangles about the periphery of the bottom.
  • thermoplastic material from the center of said bottom along a plurality of flow lines which cross one another and are of the same length to the periphery of said bottom, whereby uniform controlled material distribution is maintainedv 2;
  • flow lines are step of injecting thermoplastic material from at leasta point in a plurality of intersecting flow lines which is substantially equidistant from the furthermost extents said material must travel through said flow lines, said flow lines arranged to define a plurality of like parallelograms in rows.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Stackable Containers (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Cartons (AREA)
US335739A 1964-01-06 1964-01-06 Method of injection molding a tote case Expired - Lifetime US3264396A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US335739A US3264396A (en) 1964-01-06 1964-01-06 Method of injection molding a tote case
DED30357U DE1928957U (de) 1964-01-06 1964-12-17 Ladekasten und verfahren zur herstellung des ladekastens.
GB51539/64A GB1067738A (en) 1964-01-06 1964-12-18 Plastics carrying case or crate and method of making the same
NL6415231A NL6415231A (xx) 1964-01-06 1964-12-30
BE657908D BE657908A (xx) 1964-01-06 1965-01-05
FR895A FR1420818A (fr) 1964-01-06 1965-01-05 Boîte de transport en matière plastique et procédé de fabrication de celle-ci
US544326A US3362576A (en) 1964-01-06 1966-02-23 Plastic tote case and method of making same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US335739A US3264396A (en) 1964-01-06 1964-01-06 Method of injection molding a tote case

Publications (1)

Publication Number Publication Date
US3264396A true US3264396A (en) 1966-08-02

Family

ID=23313067

Family Applications (2)

Application Number Title Priority Date Filing Date
US335739A Expired - Lifetime US3264396A (en) 1964-01-06 1964-01-06 Method of injection molding a tote case
US544326A Expired - Lifetime US3362576A (en) 1964-01-06 1966-02-23 Plastic tote case and method of making same

Family Applications After (1)

Application Number Title Priority Date Filing Date
US544326A Expired - Lifetime US3362576A (en) 1964-01-06 1966-02-23 Plastic tote case and method of making same

Country Status (6)

Country Link
US (2) US3264396A (xx)
BE (1) BE657908A (xx)
DE (1) DE1928957U (xx)
FR (1) FR1420818A (xx)
GB (1) GB1067738A (xx)
NL (1) NL6415231A (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436446A (en) * 1966-06-08 1969-04-01 Union Carbide Corp Molding of foamed thermoplastic articles
US5560884A (en) * 1992-11-23 1996-10-01 Esterline Technologies Corporation Method of producing a molded woven cable
US5660784A (en) * 1994-01-27 1997-08-26 Cruce; Christopher J. Method of making plastic open frame basket construction
US5690886A (en) * 1994-04-15 1997-11-25 Nifco, Inc. Method for molding a speaker grille
US20050224386A1 (en) * 2004-04-08 2005-10-13 United States Postal Service Lightweight interlocking container
US20130111836A1 (en) * 2009-10-30 2013-05-09 Macneil Ip Llc Injection molded floor tiles with drainage vents

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1586624C3 (de) * 1967-04-19 1978-03-09 Wolfgang E. 4442 Bentheim Friedrich Zusammenklappbarer Transportkasten
US3392875A (en) * 1967-06-22 1968-07-16 Ms Ind Inc Stacking tray with 90 u deg. nesting
US3506154A (en) * 1968-07-08 1970-04-14 Laidlaw Corp Plastic case for milk bottles
US4023680A (en) * 1971-09-22 1977-05-17 Dare Plastics Inc. Bakery tray
US4125187A (en) * 1974-10-21 1978-11-14 Amerace Corporation Thermoplastic casing and method of manufacturing same
US5593037A (en) * 1995-09-01 1997-01-14 Ohayon; Abraham Stackable bins
USD382405S (en) * 1995-09-01 1997-08-19 Aberdeen Plastics Co., Inc. Stackable bin
WO2009075686A1 (en) * 2007-12-13 2009-06-18 Ropak Corporation Container apparatus and related methods
US8256640B2 (en) * 2007-12-13 2012-09-04 Ropak Corporation Container apparatus and related methods
US8540076B2 (en) * 2011-10-24 2013-09-24 Gary Bucholz Stackable construction container
USD771339S1 (en) 2015-09-30 2016-11-08 Bway Corporation Round pail

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199144A (en) * 1937-05-03 1940-04-30 Standard Products Co Method of injecting thermoplastic material into a mold
US2426651A (en) * 1946-03-04 1947-09-02 French Oil Mill Machinery Injection molding
US2773624A (en) * 1954-09-20 1956-12-11 Calresin Ind Inc Plastic case for transporting packaged fresh milk
DE956026C (de) * 1953-11-21 1957-01-10 Paul Bartkewitz Behaelter fuer Tusche, Farben
US2847712A (en) * 1952-11-10 1958-08-19 Bristol Aircraft Ltd Method of molding ribbed structures from thermosetting resin and fibrous material
FR1240706A (fr) * 1959-07-31 1960-09-09 Cagette pour le transport et la présentation de denrées et autres produits
US3002650A (en) * 1959-05-27 1961-10-03 Baker Plastic Containers Inc Stacking case and tote box of plastic material
US3005572A (en) * 1959-09-28 1961-10-24 Prophylactic Brush Co Plastic case construction
FR1294166A (fr) * 1960-04-01 1962-05-26 Suisse Horlogerie Dispositif électronique à circuit intégré
US3107026A (en) * 1959-11-13 1963-10-15 Novo Ind Corp Carrying case for soft drinks and the like
US3129838A (en) * 1961-04-06 1964-04-21 Iii Clark C Wormer Beverage bottle case
US3132197A (en) * 1961-06-05 1964-05-05 Phillips Petroleum Co Warp free injection molding
US3159701A (en) * 1960-12-12 1964-12-01 George L Herter Injection molding of plastic ammunition case
US3186586A (en) * 1962-11-26 1965-06-01 Box Theodor Plastic carrying case

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB822309A (en) * 1956-12-18 1959-10-21 Walter Clare Improvements in riddles or members having a cylindrical wall
US3055531A (en) * 1959-11-13 1962-09-25 Novo Ind Corp Carrying case with partitions
FR1271931A (fr) * 1960-10-25 1961-09-15 Caisse à bouteilles en matière plastique

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199144A (en) * 1937-05-03 1940-04-30 Standard Products Co Method of injecting thermoplastic material into a mold
US2426651A (en) * 1946-03-04 1947-09-02 French Oil Mill Machinery Injection molding
US2847712A (en) * 1952-11-10 1958-08-19 Bristol Aircraft Ltd Method of molding ribbed structures from thermosetting resin and fibrous material
DE956026C (de) * 1953-11-21 1957-01-10 Paul Bartkewitz Behaelter fuer Tusche, Farben
US2773624A (en) * 1954-09-20 1956-12-11 Calresin Ind Inc Plastic case for transporting packaged fresh milk
US3002650A (en) * 1959-05-27 1961-10-03 Baker Plastic Containers Inc Stacking case and tote box of plastic material
FR1240706A (fr) * 1959-07-31 1960-09-09 Cagette pour le transport et la présentation de denrées et autres produits
US3005572A (en) * 1959-09-28 1961-10-24 Prophylactic Brush Co Plastic case construction
US3107026A (en) * 1959-11-13 1963-10-15 Novo Ind Corp Carrying case for soft drinks and the like
FR1294166A (fr) * 1960-04-01 1962-05-26 Suisse Horlogerie Dispositif électronique à circuit intégré
US3159701A (en) * 1960-12-12 1964-12-01 George L Herter Injection molding of plastic ammunition case
US3129838A (en) * 1961-04-06 1964-04-21 Iii Clark C Wormer Beverage bottle case
US3132197A (en) * 1961-06-05 1964-05-05 Phillips Petroleum Co Warp free injection molding
US3186586A (en) * 1962-11-26 1965-06-01 Box Theodor Plastic carrying case

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436446A (en) * 1966-06-08 1969-04-01 Union Carbide Corp Molding of foamed thermoplastic articles
US5560884A (en) * 1992-11-23 1996-10-01 Esterline Technologies Corporation Method of producing a molded woven cable
US5855834A (en) * 1992-11-23 1999-01-05 Ysbrand; Floyd Method of producing a molded woven cable
US5660784A (en) * 1994-01-27 1997-08-26 Cruce; Christopher J. Method of making plastic open frame basket construction
US5690886A (en) * 1994-04-15 1997-11-25 Nifco, Inc. Method for molding a speaker grille
US20050224386A1 (en) * 2004-04-08 2005-10-13 United States Postal Service Lightweight interlocking container
US20130111836A1 (en) * 2009-10-30 2013-05-09 Macneil Ip Llc Injection molded floor tiles with drainage vents

Also Published As

Publication number Publication date
GB1067738A (en) 1967-05-03
US3362576A (en) 1968-01-09
BE657908A (xx) 1965-07-05
DE1928957U (de) 1965-12-09
NL6415231A (xx) 1965-07-07
FR1420818A (fr) 1965-12-10

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