GB2166384A - Electrically conductive plug pin manufacture - Google Patents
Electrically conductive plug pin manufacture Download PDFInfo
- Publication number
- GB2166384A GB2166384A GB08526044A GB8526044A GB2166384A GB 2166384 A GB2166384 A GB 2166384A GB 08526044 A GB08526044 A GB 08526044A GB 8526044 A GB8526044 A GB 8526044A GB 2166384 A GB2166384 A GB 2166384A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pins
- pin
- bandoleer
- hollow
- integral
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14008—Inserting articles into the mould
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
- B29C45/14655—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components connected to or mounted on a carrier, e.g. lead frame
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Hollow plug pins 1 having an insulated protective moulding 14 are manufactured by punching a metal sheet to form a multiplicity of pin preforms in the form of a bandoleer. The pin preforms are folded to form a strip 2 of hollow pins 1 which are integral with one another and each of which has over a part 3 of its length, a transverse cross-section that is smaller than the transverse cross-section of the adjacent plug pin parts 4, 5. The bandoleer of hollow pins is fed to an injection moulding station 12 and plastic material is moulded around the part 3 of the plug pin to form an insulating protective moulding 14. A plurality of pins may be treated in a single moulding operation, runners or other parts of plastics insulating material extending between the moulded bodies on adjacent pins subsequently being cropped or, during each moulding operation, plastics insulating material may be separately moulded around each of a plurality of pins. <IMAGE>
Description
SPECIFICATION
Electrically conductive plug pin manufacture
This invention relates to electrically conductive plug pins for use in electric plugs of the kind used in domestic and similar wiring systems and is particularly concerned with electrically conductive plug pins for this purpose which are substantially hollow and have been formed by folding or otherwise shaping a preform of sheet metal or sheet metal alloy.
When an electric plug is electrically connected in a socket outlet but the faces of the plug and outlet do not abut, there is a substantial risk that a child or other person will introduce a finger or other object between these faces and receive an electric shock. To reduce this risk, it has been proposed and is sometimes the practice to provide on at least each line pin of the plug an insulating protective covering which extends around and along a substantial part of the length of the pin projecting from the insulating plug body.
It is an object of the present invention to provide a method of manufacturing, in quantity, hollow electrically conductive plug pins, each of which has an insulating protective covering extending around and along a substantial part of the length of the pin.
According to the invention, the method comprises punching or otherwise cutting a sheet of metal or metal alloy to form a multiplicity of pin preforms in the form of a bandoleer in which adjacent pin preforms are integral with one another; folding or otherwise shaping the pin preforms, whilst still in the form of a bandoleer, to form a strip of hollow pins in which adjacent hollow pins are integral with one another, each of which hollow pins has, over a substantial part of its length between its ends, a transverse cross-section that is smaller than the transverse cross-sections of the adjacent parts of the pin; feeding the bandoleer of integral hollow pins in the direction of its length into an injection moulding machine and moulding plastics insulating material around said length of reduced transverse cross-section of each pin to form on the pin a moulded body of plastics insulating material whose outer surface forms a smooth continuation of the outer surfaces of the adjacent parts of the pin; and withdrawing the bandoleer of integral insulated hollow pins from the injection moulding machine.
On emerging from the injection moulding machine, the bandoleer of integral insulated hollow plug pins may be wound around a reel or the bandoleer of integral insulated hollow plug pins may be fed to a cutting machine which cuts the bandoleer into separate insulated hollow plug pins.
Preferably, the bandoleer of integral hollow plug pins is fed into the injection moulding machine in intermittent steps, between each of which steps plastics insulating material is moulded around the lengths of reduced transverse cross-section of a plurality of pins and, between each of which steps, downstream of the injection moulding station, runners or other parts of plastics insulating material extending between the moulded bodies of adjacent pins are cropped. Alternatively, between each step plastics insulating material may be moulded around the lengths of reduced transverse crosssection of a plurality of pins by feeding the plastics material separately to each of the plurality pins, thereby eliminating the necessity of a cropping operation to remove the runners otherwise extending between the moulded bodies of adjacent pins.
Preferably, one end of each pin preform of the bandoleer - preferably the end which will be positioned within a plug body and to which a cable conductor will be electrically connected - is integral with one longitudinal edge of a strip of metal or metal alloy so that the pin preform extends transversely from the strip. Preferably, also, the strip has, at each of a multiplicity of spaced positions along its length, an aperture or notch with which a finger can engage to feed the bandoleer positively and intermittently in the direction of its length and to position the bandoleer accurately in the injection moulding machine.
The invention also includes apparatus for use in manufacturing, in quantity, insulated hollow plug pins by the method hereinbefore described.
Insulated hollow plug pins of substantially rectangular cross-section manufactured by the method hereinbefore described are especially, but not exclusively, suitable for use in "13 amp" electric plugs of the kind to which British Standard
Specification No: 1363 relates.
The invention is further illustrated by a description, by way of example, of a preferred method of manufacturing, in quantity, hollow electrically conductive plug pins, each of which has an insulating protective covering extending around and along a part of the length of the pin, with reference to the accompanying diagrammatic drawing, in which:
Figure 1 shows a sectional side view through the injection moulding machine used for manufacturing the insulated hollow electrically conductive plug pins; and
Figure 2 shows a view of the machine in
Figure 1 in the direction of arrow A, with one part of the mould omitted.
Referring to the drawing, hollow electrically conductive plug pins 1 are manufactured using a method which comprises punching a sheet of metal to form a strip 2 of plug pin preforms, and folding each of the preforms to form a plug pin 1.
Each of the plug pins 1 over a part of its length 3 has a transverse cross-section smaller than the transverse cross-sections of adjacent parts 4, 5 of the plug pin.
The hollow plug pins 1 are in the form of a bandoleer, with adjacent plug pins of the bandoleer integral with one another. The end 6 of each plug pin 1, which will be positioned within a plug and to which a cable conductor will be electrically connected, is integral with the strip 2 so that the plug pin extends transversely from the strip.
The strip 2 has at each of a multiplicity of spaced positions along its length an aperture 8 with which fingers 9 of the manufacturing apparatus can en gage to feed the bandoleer through the apparatus.
In operation, the bandoleer of plug pins 1 is fed in direction B in intermittent steps into the injection moulding machine 10 between location guides 11, by the engagement of fingers 9 with apertures 8 in the strip 2. The engagement of fingers 9 in aperture 8 also acts to position the bandoleer accurately within the injection moulding machine 10 which comprises a moulding station 12 and a cropping station 13.
Between each of the intermittent feeding steps whilst the bandoleer is stationary - plastics insulating material is moulded around the length 3 of reduced transverse cross-section of each of six hollow plug pins 1 to form a moulded body 14 and, at the same time immediately downstream of the injection moulding section 12 runners or any other parts of plastics insulating material extending between the moulded bodies 14 of adjacent pins, which have been moulded during the previous step, are cropped in the cropping station 13.
The moulding and cropping operations form on each plug pin 1 a moulded body 14 of plastics insulating material whose outer surface forms a smooth continuation of the outer surfaces of parts 4, 5 of the pin.
The bandoleer of integral insulated hollow pins 1 is withdrawn from the injection moulding machine 10, and fed to a cutting machine (not shown) which cuts the bandoleer into separate insulated hollow plug pins.
Claims (10)
1. A method of manufacturing, in quantity, hollow electrically conductive plug pins each of which has an insulating protective covering extending upward and along a substantial part of the length of the pin, which method comprises punching or otherwise cutting a sheet of metal or metal alloy to form a multiplicity of pin preforms in the form of a bandoleer in which adjacent pin preforms are integral with one another; folding or otherwise shaping the pin preforms, whilst still in the form of a bandoleer, to form a strip of hollow pins in which adjacent hollow pins are integral with one another, each of which hollow pins has, over a substantial part of its length between its ends, a transverse cross-section that is smaller than the transverse cross-sections of the adjacent parts of the pin; feeding the bandoleer of integral hollow pins in the direction of its length into an injection moulding machine and moulding plastics insulating material around said length of reduced transverse crosssection of each pin to form on the pin a moulded body of plastics insulating material whose outer surface forms a smooth continuation of the outer surfaces of the adjacent parts of the pin; and withdrawing the bandoleer of integral insulated hollow pins from the injection moulding machine.
2. A method as claimed in claim 1, in which, on emerging from the injection moulding machine, the bandoleer of integral insulated hollow plug pins is wound around a reel.
3. A method as claimed in claim 1, in which, on emerging from the injection moulding machine, the bandoleer of integral insulated hollow plug pins is fed to a cutting machine which cuts the bandoleer into separate insulated hollow plug pins.
4. A method as claimed in any one of the preceding claims, in which the bandoleer of integral hollow plug pins is fed into the injection moulding machine in intermittent steps, between each of which steps plastics insulating material is moulded around the lengths of reduced transverse crosssection of a plurality of pins and, between each of which steps, downstream of the injection moulding station, runners or other parts of plastics insulating material extending between the moulded bodies of adjacent pins are cropped.
5. A method as claimed in any one of the preceding claims, in which one end of each pin preform of the bandoleer is integral with one longitudinal edge of a strip of metal or metal alloy so that the pin preform extends transversely from the strip.
6. A method as claimed in claim 5, in which the end of each pin integral with the longitudinal edge of the strip is the end which will be positioned within a plug body and to which a cable conductor will be electrically connected.
7. A method as claimed in any one of claims 4, 5 or 6 in which the strip has, at each of a multiplicity of spaced positions along its length, an aperture or notch with which a finger can engage to feed the bandoleer positively and intermittently in the direction of its length and to position the bandoleer accurately in the injection moulding machine.
8. A method of manufacturing, in quantity, hollow electrically conductive pins, each of which has an insulating protective covering extending upwards and along a substantial part of the length of the pin, which method is substantially as hereinbefore described with reference to the accompanying drawing.
9. Apparatus for manufacturing in quantities, hollow electrically conductive plug pins, each of which has an insulating protective covering extending around and along a substantial part of the length of the pin which apparatus is substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
10. An insulated hollow electrically conductive plug pin manufactured by the method claimed in any one of claims 1 to 8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848426668A GB8426668D0 (en) | 1984-10-22 | 1984-10-22 | Plug pin |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8526044D0 GB8526044D0 (en) | 1985-11-27 |
| GB2166384A true GB2166384A (en) | 1986-05-08 |
| GB2166384B GB2166384B (en) | 1988-03-02 |
Family
ID=10568552
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB848426668A Pending GB8426668D0 (en) | 1984-10-22 | 1984-10-22 | Plug pin |
| GB08526044A Expired GB2166384B (en) | 1984-10-22 | 1985-10-22 | Electrically conductive plug pin manufacture |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB848426668A Pending GB8426668D0 (en) | 1984-10-22 | 1984-10-22 | Plug pin |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8426668D0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353810A2 (en) * | 1988-08-01 | 1990-02-07 | C.A. WEIDMÜLLER GMBH & CO. | Process for producing contact pieces from strip material, contact pieces produced according to the process and strip material for producing contact pieces |
-
1984
- 1984-10-22 GB GB848426668A patent/GB8426668D0/en active Pending
-
1985
- 1985-10-22 GB GB08526044A patent/GB2166384B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353810A2 (en) * | 1988-08-01 | 1990-02-07 | C.A. WEIDMÜLLER GMBH & CO. | Process for producing contact pieces from strip material, contact pieces produced according to the process and strip material for producing contact pieces |
| EP0353810A3 (en) * | 1988-08-01 | 1991-03-20 | C.A. WEIDMÜLLER GMBH & CO. | Process for producing contact pieces from strip material, contact pieces produced according to the process and strip material for producing contact pieces |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8426668D0 (en) | 1984-11-28 |
| GB2166384B (en) | 1988-03-02 |
| GB8526044D0 (en) | 1985-11-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |