GB2119699A - Methods of embodying components in rotational moulded plastic articles - Google Patents

Methods of embodying components in rotational moulded plastic articles Download PDF

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Publication number
GB2119699A
GB2119699A GB08213105A GB8213105A GB2119699A GB 2119699 A GB2119699 A GB 2119699A GB 08213105 A GB08213105 A GB 08213105A GB 8213105 A GB8213105 A GB 8213105A GB 2119699 A GB2119699 A GB 2119699A
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United Kingdom
Prior art keywords
mould
article
moulded
component
entrant
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.)
Granted
Application number
GB08213105A
Other versions
GB2119699B (en
Inventor
John Lloyd
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.)
Glasdon Ltd
Original Assignee
Glasdon Ltd
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 Glasdon Ltd filed Critical Glasdon Ltd
Priority to GB08213105A priority Critical patent/GB2119699B/en
Publication of GB2119699A publication Critical patent/GB2119699A/en
Application granted granted Critical
Publication of GB2119699B publication Critical patent/GB2119699B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/20—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. moulding inserts or for coating articles
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

A plastics bin is made by rotational moulding in a mould (10) having a split line extending across the mould dividing the mould into a lower part (10a) in which the main body of the bin is moulded and an upper part (12) which forms the upper part of the periphery of the bin. The mould is shaped on at least one side to form two outwardly projecting lugs (16) (17) on the periphery of the bin with a re-entrant portion between them. The upper and lower parts of the mould are formed with co-operating apertures (18, 19) on either side of the re-entrant portion, in which apertures a handle (20) is mounted. The ends of the handle project into the lug forming parts of the mould and are embedded in the moulded bin to provide a hand hold for the bin. <IMAGE>

Description

SPECIFICATION Methods of embodying components in rotational moulded plastics articles This invention relates to methods of embodying components in rotational moulded plastics articles.
The invention provides a method of attaching a component to an article formed in plastics by rotational moulding in which a mould having an inner peripheral shape corresponding to the required external shape of the article to be formed has a split line extending across the mould to enable the mould to be opened to permit the completed article to be extracted from the mould and re-entrant portion at the split line of the mould wherein apertures are provided through the mould wall at the split line on opposite sides of the re-entrant portion and the component to be embodied in the moulded article is located across the re-entrant portion with the ends of the component extending through the apertures into the mould interior and plastics material is cast in the mould whilst the mould is rotated to form the article, the plastics material enveloping the ends of the component projecting into the mould to anchor the ends of the component in the finished moulded article.
The following is a description of one embodiment of the invention, reference being made to the accompanying drawings in which: Figure 1 is a side view of a rotational mould for moulding an open topped container; Figure 2 is a detailed view of part of the mould; and Figures 3 to 5 are perspective views of parts of the moulded container.
Figure 1 of the drawings illustrates a rotational mould 10 for moulding an open topped deep walled container. The mould has a split line 1 1 adjacent its upper end extending across the mould dividing the mould into a lower part 1 Oa in which the main body of the article to be formed is moulded together with a lower part of the upper periphery of the article and an upper part 12 which forms the upper part of the periphery of the container. The upper and lower parts of the mould are formed with peripheral clamping flanges 13 and 14 across the split line 1 1 to receive bolts for securing the two parts of the mould together during the moulding operation.
Figure 2 of the drawings shows the details of the upper and lower parts of the mould on either side of the mould plane 1 1 in greater detail and the peripheral cavity around the top of the lower part of the mould in which the lower part of the periphery of the container to be moulded is formed is illustrated at 1 5. The periphery of the lower part of the mould 1 Oa is formed with the re-entrant portions 16 on both sides of the mould (only one of which can be seen) and the top part 1 2 of the mould which forms the upper part of the periphery of the container is formed with corresponding re-entrant portions 17. The mould wall on either side of the re-entrant portion 16 is formed with coaxial semi-cylindrical recesses 18 and similar recesses 19 are formed in the top part of the mould on either side of the re-entrant portions 1 7.When the mould is clamped together, the recesses 18, 19 form cylindrical bores through the mould wall.
Prior to assembly of the upper and lower parts of the mould, tubular members 20 are laid across the re-entrant portion 1 6 in the lower part of the mould in the recesses 18 with the ends of the tubular members extending into the mould cavity itself. The top part of the mould is then secured to the lower part of the mould and raw plastics material is introduced into the mould and the mould rotated to complete the moulding of the article in the mould in conventional manner.
The resulting moulded article 21 is illustrated in Figures 3 to 5 of the drawings and it will be seen that the re-entrant portions 16, 17 on the mould form corresponding re-entrant portions 52 on either side of the upper periphery of the article.
The tubular members 20 bridge the re-entrant portions and the ends of the tubular members are wholly embodied in moulded material on either side of the re-entrant portions. The tubular members are thus rigidly embodied in the periphery of the container and form handles for lifting or manoeuvring the container.
The invention is equally applicable to the moulding of other components in rotational moulding operations.
1. A method of attaching a component to an article formed in plastics by rotational moulding in which a mould having an inner peripheral shape corresponding to the required external shape of the article to be formed has a split line extending across the mould to enable the mould to be opened to permit the completed article to be extracted from the mould and a re-entrant portion at the split line of the mould wherein apertures are provided through the mould wall at the split line on opposite sides of the re-entrant portion and the component to be embodied in the moulded article is located across the re-entrant portion with the ends of the component extending through the apertures into the mould interior and plastics material is cast in the mould whilst the mould is rotated to form the article, the plastics material enveloping the ends of the component projecting into the mould to anchor the ends of the component in the finished moulded article.
2. A method as claimed in claim 1 wherein the apertures on either side of the re-entrant portion and coaxial bores through the mould wall halfformed in one side of the mould and half-formed in the other side and an elongate member is mounted in the apertures extending across the re-entrant portion of the mould with the ends of the member extending into the mould said ends being enveloped in mould material during the moulding operation, the re-entrant portion of the mould forming a re-entrant portion in the periphery of the moulded article with the member extending across the re-entrant portion to provide a handle
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Methods of embodying components in rotational moulded plastics articles This invention relates to methods of embodying components in rotational moulded plastics articles. The invention provides a method of attaching a component to an article formed in plastics by rotational moulding in which a mould having an inner peripheral shape corresponding to the required external shape of the article to be formed has a split line extending across the mould to enable the mould to be opened to permit the completed article to be extracted from the mould and re-entrant portion at the split line of the mould wherein apertures are provided through the mould wall at the split line on opposite sides of the re-entrant portion and the component to be embodied in the moulded article is located across the re-entrant portion with the ends of the component extending through the apertures into the mould interior and plastics material is cast in the mould whilst the mould is rotated to form the article, the plastics material enveloping the ends of the component projecting into the mould to anchor the ends of the component in the finished moulded article. The following is a description of one embodiment of the invention, reference being made to the accompanying drawings in which: Figure 1 is a side view of a rotational mould for moulding an open topped container; Figure 2 is a detailed view of part of the mould; and Figures 3 to 5 are perspective views of parts of the moulded container. Figure 1 of the drawings illustrates a rotational mould 10 for moulding an open topped deep walled container. The mould has a split line 1 1 adjacent its upper end extending across the mould dividing the mould into a lower part 1 Oa in which the main body of the article to be formed is moulded together with a lower part of the upper periphery of the article and an upper part 12 which forms the upper part of the periphery of the container. The upper and lower parts of the mould are formed with peripheral clamping flanges 13 and 14 across the split line 1 1 to receive bolts for securing the two parts of the mould together during the moulding operation. Figure 2 of the drawings shows the details of the upper and lower parts of the mould on either side of the mould plane 1 1 in greater detail and the peripheral cavity around the top of the lower part of the mould in which the lower part of the periphery of the container to be moulded is formed is illustrated at 1 5. The periphery of the lower part of the mould 1 Oa is formed with the re-entrant portions 16 on both sides of the mould (only one of which can be seen) and the top part 1 2 of the mould which forms the upper part of the periphery of the container is formed with corresponding re-entrant portions 17. The mould wall on either side of the re-entrant portion 16 is formed with coaxial semi-cylindrical recesses 18 and similar recesses 19 are formed in the top part of the mould on either side of the re-entrant portions 1 7.When the mould is clamped together, the recesses 18, 19 form cylindrical bores through the mould wall. Prior to assembly of the upper and lower parts of the mould, tubular members 20 are laid across the re-entrant portion 1 6 in the lower part of the mould in the recesses 18 with the ends of the tubular members extending into the mould cavity itself. The top part of the mould is then secured to the lower part of the mould and raw plastics material is introduced into the mould and the mould rotated to complete the moulding of the article in the mould in conventional manner. The resulting moulded article 21 is illustrated in Figures 3 to 5 of the drawings and it will be seen that the re-entrant portions 16, 17 on the mould form corresponding re-entrant portions 52 on either side of the upper periphery of the article. The tubular members 20 bridge the re-entrant portions and the ends of the tubular members are wholly embodied in moulded material on either side of the re-entrant portions. The tubular members are thus rigidly embodied in the periphery of the container and form handles for lifting or manoeuvring the container. The invention is equally applicable to the moulding of other components in rotational moulding operations. CLAIMS
1. A method of attaching a component to an article formed in plastics by rotational moulding in which a mould having an inner peripheral shape corresponding to the required external shape of the article to be formed has a split line extending across the mould to enable the mould to be opened to permit the completed article to be extracted from the mould and a re-entrant portion at the split line of the mould wherein apertures are provided through the mould wall at the split line on opposite sides of the re-entrant portion and the component to be embodied in the moulded article is located across the re-entrant portion with the ends of the component extending through the apertures into the mould interior and plastics material is cast in the mould whilst the mould is rotated to form the article, the plastics material enveloping the ends of the component projecting into the mould to anchor the ends of the component in the finished moulded article.
2. A method as claimed in claim 1 wherein the apertures on either side of the re-entrant portion and coaxial bores through the mould wall halfformed in one side of the mould and half-formed in the other side and an elongate member is mounted in the apertures extending across the re-entrant portion of the mould with the ends of the member extending into the mould said ends being enveloped in mould material during the moulding operation, the re-entrant portion of the mould forming a re-entrant portion in the periphery of the moulded article with the member extending across the re-entrant portion to provide a handle for the article.
3. A method as claimed in claim 2 wherein the apertures in the mould wall are cylindrical and the component is a hollow tubular member.
4. A method as claimed in any of the preceding claims wherein a plurality of components are embodied in the moulded article at locations spaced around the article.
5. A method of incorporating a component in an article formed in plastics materials by rotational moulding substantially as described hereinbefore.
6. A plastics moulded article formed by rotational moulding having a component or components incorporated therein by a method of any of the preceding claims.
GB08213105A 1982-05-06 1982-05-06 Methods of embodying components in rotational moulded plastic articles Expired GB2119699B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08213105A GB2119699B (en) 1982-05-06 1982-05-06 Methods of embodying components in rotational moulded plastic articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08213105A GB2119699B (en) 1982-05-06 1982-05-06 Methods of embodying components in rotational moulded plastic articles

Publications (2)

Publication Number Publication Date
GB2119699A true GB2119699A (en) 1983-11-23
GB2119699B GB2119699B (en) 1985-08-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08213105A Expired GB2119699B (en) 1982-05-06 1982-05-06 Methods of embodying components in rotational moulded plastic articles

Country Status (1)

Country Link
GB (1) GB2119699B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185707A (en) * 1986-01-20 1987-07-29 Glasdon Ltd Moulding a container recess around a handle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185707A (en) * 1986-01-20 1987-07-29 Glasdon Ltd Moulding a container recess around a handle
GB2185707B (en) * 1986-01-20 1989-10-25 Glasdon Ltd Moulds for plastic containers

Also Published As

Publication number Publication date
GB2119699B (en) 1985-08-29

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980506