WO1981000077A1 - Moulding plastics articles - Google Patents

Moulding plastics articles Download PDF

Info

Publication number
WO1981000077A1
WO1981000077A1 PCT/GB1980/000106 GB8000106W WO8100077A1 WO 1981000077 A1 WO1981000077 A1 WO 1981000077A1 GB 8000106 W GB8000106 W GB 8000106W WO 8100077 A1 WO8100077 A1 WO 8100077A1
Authority
WO
WIPO (PCT)
Prior art keywords
article
members
body portion
moulded
moulding
Prior art date
Application number
PCT/GB1980/000106
Other languages
French (fr)
Inventor
D Downey
Original Assignee
Downey Plastics Ltd
D Downey
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 Downey Plastics Ltd, D Downey filed Critical Downey Plastics Ltd
Publication of WO1981000077A1 publication Critical patent/WO1981000077A1/en

Links

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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/0055—Shaping
    • 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
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0033—Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes
    • 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
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29L2031/764—Photographic equipment or accessories

Definitions

  • the present invention relates to the moulding of articles of plasticsmaterial.
  • a method of making a plastics article having portions defining apertures and/or recesses therein whose disposition is such as would obstruct mould release if the article were moulded in a two-part mould comprising moulding the article with one or more of those portions disposed in positions differing from their intended position such that obstruction of mould- release does not occur and each connected to the remainder of the article by a flexible web, hinging said one or more portions into its/their intended positions, and securing it/them fast to the remainder of the article.
  • the invention provides a
  • 0-..PI method of making a camera filter holder having a generall planar body portion with a central aperture therein, and a pair of members disposed on opposing sides of the aperture and each having therein at least one slot, lying generally parallel to the plane of the body portion for receiving a filter, comprising the steps of moulding the members and body portion from plastics material as a single unit with the members connected to the body porti by flexible webs and disposed with the slots lying in planes generally perpendicular to the plane of the body- portion, hinging the members relative to the body portion so that the slots lie generally parallel to the plane thereof, and securing the members fast to the body portion.
  • the moulding may for example be by injection moulding.
  • the step of securing the members is effected using ultrasonic welding, although other means, such as the use of an adhesive, may be employed.
  • Figure 1 is a front elevation of a camera filter holder
  • Figure 2 is a side elevation of the holder of figure 1;
  • Figure 3 is a cross-section on line III-III f figure 1;
  • Figure .4 shows -an adaptor ring for mounting the .• holder of figure 1.
  • a camera filter holder 1 comprises a generally planar body portion 2 having a central opening 3. Its rear face is provided with reinforcing ribs 4 and also four projecting fingers 5, with grooves 6 therein, which serve to clip the holder onto an adaptor ring (described below) so that, in use, the opening " 3 lies in front of the camera lens.
  • a member 7 and 8 Secured to the body portion at each side of the holder is a member 7 and 8 having (for example) three slots 71, 72, 73; 81, 82, 83 formed therein.
  • the slots lie generally parallel to the plane of the body portion 2, so that upto three square (or rectangular) filters can be slid into a pair of opposed slots (e.g.72, 82) -One end of _each.member 7,8 -is tapered to facilitate filter insertion, and spring leaves 9 are provided at the base of each slot in order to retain the filter in position.
  • the entire assembly is integrally moulded from a suitable plastics material, e.g. by injection moulding.
  • the member 7 of the holder is shown in figures 1 and 2 in an "opened-out" position, with the slots 71, 72, 73 disposed at right angles to the plane of the body portion 2.
  • the holder is moulded with both members 7, 8 in this position - attached to the body portion only by a relatively thin web or hinge 10. This permits the unit to be made in a straightforward split mould.
  • the members 7, 8 are hinged through 90 as indicated for member 7 in figure 2, and secure in position,as-i-ilustrated in figure 3.
  • the e ⁇ bers can be fixed by an adhesive, or other convenient means, but in the preferred embodiment ultrasonic welding is employed, and for this purpose staking ribs 11 are formed during moulding.
  • the assembly must be of a plastics material capable of being ultra- sonically welded. Unfilled polyacetal is found to be suitable. It will be appreciated that this technique considerably simplifies manufacture of the article which, by conventional techniques would of necessity involve complex and costly moulding techniques.
  • the adaptor ring 50 is shown in figure 4 and has an internal thread (not shown) to permit it to be screwed onto the lens assembly of the camera, and an external circumferential rib 51.
  • the holder is retained on the ring by means of the fingers 5 which clip over the ring 10, the rib 51 engaging in the grooves 6.
  • the use of the adaptor ring permits the holder to be fitted to different types of camera simply by changing the adaptor ring for one having an appropriate thread: also rotation of the holder relative to the camera is.permitted, which is useful, for example,when employing polarised filters.
  • ⁇ o

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A plastics article to be moulded has portions such as to obstruct mould release. The use of complex moulding apparatus is avoided by moulding the article with those portions disposed in positions differing from their intended positions, connected to the article by flexible webs. After moulding, the portions are hinged to their final positions, and secured. One application of the invention is the manufacture of a camera filter holder (1), where members (8, 9) with slots (71, 72, 73; 81, 82, 83) for filters, are moulded with the slots at right-angles to the plane of the holder (as shown for member 7) and then hinged through 90 and welded at the final position (as shown for member 8).

Description

"MOULDING PLASTICS ARTICLES" The present invention relates to the moulding of articles of plasticsmaterial.
The ease with which articles can be moulded in plastics is heavily dependent on the shape of the article. Often articles are required having apertures, recesses or projections such as to hinder removal of the article from the mould, so that it cannot be formed in a two part mould. With conventional techniques such articles have to be formed in a number of separate parts, or require the use of complex moulding apparatus, for example having retractable sections. Manufacture is therefore difficult and costly.
According to one aspect of the present invention there is provided a method of making a plastics article having portions defining apertures and/or recesses therein whose disposition is such as would obstruct mould release if the article were moulded in a two-part mould, comprising moulding the article with one or more of those portions disposed in positions differing from their intended position such that obstruction of mould- release does not occur and each connected to the remainder of the article by a flexible web, hinging said one or more portions into its/their intended positions, and securing it/them fast to the remainder of the article. In another aspect, the invention provides a
0-..PI method of making a camera filter holder having a generall planar body portion with a central aperture therein, and a pair of members disposed on opposing sides of the aperture and each having therein at least one slot, lying generally parallel to the plane of the body portion for receiving a filter, comprising the steps of moulding the members and body portion from plastics material as a single unit with the members connected to the body porti by flexible webs and disposed with the slots lying in planes generally perpendicular to the plane of the body- portion, hinging the members relative to the body portion so that the slots lie generally parallel to the plane thereof, and securing the members fast to the body portion. The moulding may for example be by injection moulding. Preferably the step of securing the members is effected using ultrasonic welding, although other means, such as the use of an adhesive, may be employed.
In a further aspect, the invention extends to articles produced using the above-described methods. An exemplary embodiment of the invention will now be described with reference to the accompanying drawings, in which :-
Figure 1 is a front elevation of a camera filter holder; Figure 2 is a side elevation of the holder of figure 1;
Figure 3 is a cross-section on line III-III f figure 1; and
c: Figure .4 shows -an adaptor ring for mounting the .• holder of figure 1.
A camera filter holder 1 comprises a generally planar body portion 2 having a central opening 3. Its rear face is provided with reinforcing ribs 4 and also four projecting fingers 5, with grooves 6 therein, which serve to clip the holder onto an adaptor ring (described below) so that, in use, the opening" 3 lies in front of the camera lens. Secured to the body portion at each side of the holder is a member 7 and 8 having (for example) three slots 71, 72, 73; 81, 82, 83 formed therein. In the finished holder the slots lie generally parallel to the plane of the body portion 2, so that upto three square (or rectangular) filters can be slid into a pair of opposed slots (e.g.72, 82) -One end of _each.member 7,8 -is tapered to facilitate filter insertion, and spring leaves 9 are provided at the base of each slot in order to retain the filter in position. The entire assembly is integrally moulded from a suitable plastics material, e.g. by injection moulding.
It will be observed that the member 7 of the holder is shown in figures 1 and 2 in an "opened-out" position, with the slots 71, 72, 73 disposed at right angles to the plane of the body portion 2. The holder is moulded with both members 7, 8 in this position - attached to the body portion only by a relatively thin web or hinge 10. This permits the unit to be made in a straightforward split mould.
After moulding, the members 7, 8 are hinged through 90 as indicated for member 7 in figure 2, and secure in position,as-i-ilustrated in figure 3. The eπbers can be fixed by an adhesive, or other convenient means, but in the preferred embodiment ultrasonic welding is employed, and for this purpose staking ribs 11 are formed during moulding. Obviously where this method is employed the assembly must be of a plastics material capable of being ultra- sonically welded. Unfilled polyacetal is found to be suitable. It will be appreciated that this technique considerably simplifies manufacture of the article which, by conventional techniques would of necessity involve complex and costly moulding techniques.
The adaptor ring 50 is shown in figure 4 and has an internal thread (not shown) to permit it to be screwed onto the lens assembly of the camera, and an external circumferential rib 51. The holder is retained on the ring by means of the fingers 5 which clip over the ring 10, the rib 51 engaging in the grooves 6. It will be appreciated that the use of the adaptor ring permits the holder to be fitted to different types of camera simply by changing the adaptor ring for one having an appropriate thread: also rotation of the holder relative to the camera is.permitted, which is useful, for example,when employing polarised filters. ^ o:

Claims

CLAIMS :
1. A method of making a plastics article having portions defining apertures and/or recesses therein whose disposition is such as would obstruct mould release if the article were moulded in a two-part mould, comprising moulding the article with one or more of those portions disposed in positions differing from their intended position such that obstruction of mould release does not occur and each connected to the remainder of the article by a flexible web, hinging said one or more portions into its/their intended positions, and securing it/them fast to the remainder of the article.
2. A method according to claim 1 in which the article is moulded in a two-part mould.
3. A method according .to claim 1 or 2 in which the -article is moulded by injection moulding.
4. A method according to claim 1,2 or 3 in which the members are secured to the body by ultrasonic welding.
5. A method of making a camera filter holder having a generally planar body portion with a central aperture therein, and a pair of members disposed on opposing sides of the aperture and each having therein at least one slot lying generally parallel to the plane of the body portion for receiving a filter, comprising the steps of moulding the members and body portion from plastics material as a single unit with the members connected to the. body portion by flexible webs and disposed with the slots lying in planes generally perpendicular to the plane of the body portion, hinging the members. relative to the body portion so that the slots lie generally parallel to the plane thereof, and securing the members fast to the body portion.
6. A method ■according to claim 5 in which a longitudinally extending spring leaf is integrally formed in the base of each slot.
7. A method according to claim .5 or 6 in which the article is moulded in a two-part mould.
8. A method according to claim 5,6 or 7 in which the article is moulded by injection moulding.
9. A method according to any one of claims 5 to 8 in which the members are secured to the body by ultrasonic welding.
10. An article made by the method according to any one of the preceding claims.
PCT/GB1980/000106 1979-06-27 1980-06-24 Moulding plastics articles WO1981000077A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7922395 1979-06-27
GB7922395 1979-06-27

Publications (1)

Publication Number Publication Date
WO1981000077A1 true WO1981000077A1 (en) 1981-01-12

Family

ID=10506140

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1980/000106 WO1981000077A1 (en) 1979-06-27 1980-06-24 Moulding plastics articles

Country Status (3)

Country Link
EP (1) EP0032488A1 (en)
BE (1) BE884036A (en)
WO (1) WO1981000077A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0304290A1 (en) * 1987-08-19 1989-02-22 Derwent Mac Dee Limited Moulding of plastics material
GB2208822A (en) * 1987-08-19 1989-04-19 Aurora Plastics Ltd Moulding of plastics materials
JP2016012043A (en) * 2014-06-30 2016-01-21 東芝テリー株式会社 Camera assembly arrangement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1157693A (en) * 1980-01-11 1983-11-29 Howard W. Biddle Torque wrench

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6818880A (en) * 1968-12-31 1969-12-29
US3537676A (en) * 1967-12-20 1970-11-03 Valve Corp Of America Mold apparatus for closure with integral cap
DE1932313A1 (en) * 1969-06-26 1971-01-07 Volkswagenwerk Ag Plastic housing for movable parts
FR2226259A1 (en) * 1973-04-19 1974-11-15 Lucas Electrical Co Ltd
GB1424667A (en) * 1972-02-16 1976-02-11 Alpa Steel Plastics Ltd Method of moulding a plastics material element and apparatus therefor
EP0004246A2 (en) * 1978-03-14 1979-09-19 Jean-Claude Coquin Device for mounting accessories on camera objectives and a hood to be used with this device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3537676A (en) * 1967-12-20 1970-11-03 Valve Corp Of America Mold apparatus for closure with integral cap
NL6818880A (en) * 1968-12-31 1969-12-29
DE1932313A1 (en) * 1969-06-26 1971-01-07 Volkswagenwerk Ag Plastic housing for movable parts
GB1424667A (en) * 1972-02-16 1976-02-11 Alpa Steel Plastics Ltd Method of moulding a plastics material element and apparatus therefor
FR2226259A1 (en) * 1973-04-19 1974-11-15 Lucas Electrical Co Ltd
EP0004246A2 (en) * 1978-03-14 1979-09-19 Jean-Claude Coquin Device for mounting accessories on camera objectives and a hood to be used with this device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0304290A1 (en) * 1987-08-19 1989-02-22 Derwent Mac Dee Limited Moulding of plastics material
GB2208822A (en) * 1987-08-19 1989-04-19 Aurora Plastics Ltd Moulding of plastics materials
GB2208822B (en) * 1987-08-19 1991-10-02 Aurora Plastics Ltd Moulding of plastics materials
JP2016012043A (en) * 2014-06-30 2016-01-21 東芝テリー株式会社 Camera assembly arrangement

Also Published As

Publication number Publication date
EP0032488A1 (en) 1981-07-29
BE884036A (en) 1980-10-16

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