GB2110587A - Making a non-rewirable plug - Google Patents
Making a non-rewirable plug Download PDFInfo
- Publication number
- GB2110587A GB2110587A GB08230849A GB8230849A GB2110587A GB 2110587 A GB2110587 A GB 2110587A GB 08230849 A GB08230849 A GB 08230849A GB 8230849 A GB8230849 A GB 8230849A GB 2110587 A GB2110587 A GB 2110587A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rewirable
- pins
- forming
- mould
- plug
- 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.)
- Withdrawn
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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1671—Making multilayered or multicoloured articles with an insert
-
- 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
- B29C45/14065—Positioning or centering articles in 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/502—Bases; Cases composed of different pieces
- H01R13/504—Bases; Cases composed of different pieces different pieces being moulded, cemented, welded, e.g. ultrasonic, or swaged together
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/44—Means for preventing access to live contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/56—Means for preventing chafing or fracture of flexible leads at outlet from coupling part
- H01R13/567—Traverse cable outlet or wire connection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/68—Structural association with built-in electrical component with built-in fuse
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2103/00—Two poles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
- H01R24/28—Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable
-
- 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
- H01R43/20—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve
- H01R43/24—Assembling by moulding on contact members
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Connector Housings Or Holding Contact Members (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
A non-rewirable electrical plug is described in which the plug body is formed of separate components (13, 15). In making the plug, firstly the electrical termination pins are held in desired spaced relationship within a first mould, Fig 3 (not shown) and are then surrounded by injected synthetic plastics material to form a first formed plug (13). Said formed plug (13) is then placed in a second mould (not shown) to encapsulate the first formed plug within a second injected synthetic plastics material (15). The first synthetic plastics material is different from the second synthetic plastics material. <IMAGE>
Description
SPECIFICATION
Non-rewirable plug
This invention is concerned with a nonrewirable electric plug, for example of the kind used with domestic mains electricity supply.
In order to connect an appliance to the mains electricity supply it is usual to connect a plug on to a cable connected to the appliance, the plug then being inserted into a corresponding supply socket.
Hitherto, it has been the practice for the cables to have wires at the end thereof to which the purchaser of the appliance then secures a plug himself.
Accidents have occurred by the purchaser connecting the wires in the wrong manner, as for example, connecting the earth cable to the live terminal of the plug and thus causing accidents either personal to the user or to the appliance or to both.
Accordingly, by having a cable with its wire connected to the appliance at one end and with a plug which is not rewirable by the user at the other end, such disadvantages as herein before mentioned can be avoided.
Several types of plugs of a non-rewirable nature are known. For example, it is known to provide a housing for the contact pins which are placed in the housing and for a cover member to be placed over that housing and then for the housing itself to be encapsulated in further plastics material for securing the cable and preventing opening of the housing by the user.
According to the present invention, a nonrewirable electrical plug is formed by first connecting the desired terminal pins to the wire of electrical cable, placing those pins in a mould, in desired spaced relationship, injecting a plastics material into the mould to hold the pins in said spaced relationship, removing the formed plug from the mould and thereafter placing the plug in a second mould and injecting a second plastics material to encapsulate the first mentioned moulded plug within a second plastics material.
The present invention also provides an electrical plug comprising pins for engaging in and electrically connecting with a cooperating electrical socket, wires electrically secured to said pins, a first moulding of synthetic plastics material surrounding said pins to hold same in desired spaced relationship, and second moulding of synthetic plastics material encapsulating said first moulding.
In a particular way of constructing the plug according to the present invention, a die or mould is provided with three sockets therein, one for each of the three conventional pins of a three pin plug system. Having secured the pins to the wires the pins are inserted into the required sockets in the mould the mould is then closed and plastics material injected into it to hold the pins in the desired spaced relationship. In the case of a live pin, a fuse holder will be provided and sockets are provided for holding the fuse holder in the correct space relationship for the insertion of a fuse therein.
Thereafter the plug thus formed with the pins in the desired spaced relationship is placed inside a second mould and a second plastics material injected therein to encapsulate the first mould at the same time providing a spout for securing the cable containing the wires. The second plastics material is of such a nature as to give the desired appearance of colour, feel and other matters, at the same time ensuring that no portion of any pin or cable is in contact with the outer surface of the mould. Thus a double skin insulation of the pins of the plug is obtained.
The non rewirable plugs of the present invention may also be used with electrical circuits other than domestic mains. For example, low voltage circuits such as those employed in underground mine workings or in ships.
Alternatively the plugs of the present invention may be used for industrial electrical circuits.
The process of the present invention provides an electrical plug of a novel form, which is both relatively economical to manufacture and which at the same time may be of pleasing appearance and electrically safe.
In order that the present invention may be more readily understood, reference is now made to the accompanying drawing, in which:~ Figures 1, 2 and 3 show successive stages of a pin being inserted into a mould according to one embodiment of the present invention;
Figures 4 and 5 show a pin being inserted into a mould according to a second embodiment of the invention;
Figure 6 illustrates a further manner of securing a a pin within a mould according to the present invention;
Figure 7 is a cross-section of completed plug according to the present invention; and
Figure 8 is a perspective view of a first mould showing the pins in predetermined space relationship.
Referring firstly to Figures 1, 2 and 3, a mould 4 is provided, as illustrated in cross-section, and the mould will be provided with the necessary number of sockets 5 according to the number of pins, which in the United Kingdom will be three rectangular shaped pins.
Two pins 1 each with a head 2 are inserted into their respective socket 5 of a mould member 4.
One of the pins has a waisted portion 11 between the end 1 of the pin and the head 2. The pins will previously have been secured to the correct wires of a cable (not illustrated) by conventional means, such as for example, by welding or soldering, or by crimping. The pins 1 are held in their sockets 5 by plungers 6 applying pressure to the side of the pin as illustrated in Figures 2 and 3. This is necessary because as the plastics material is injected into the mould there will be a tendency for it to creep down the sides of the sockets 5 between the sockets 5 and the pins 1 and thereby displace the pins 1. Thus to ensure that all pins are uniformly at the desired extension from the base of the plug, plungers 6, which may be hydraulically operated, are provided.
After all pins have been accurately placed into their respective sockets 5 and the plungers 6 operated, the mould is closed by a cover 7 and the plastics material injected into the cavity 3. The mould member 4 has a protuberance 4a which forms a recess in the moulded plug for a fuse holder.
In the construction illustrated in Figures 4 and 5 each pin is inserted into an aperture formed in the base of the mould whereupon the pin is clamped by calipers 8 withdrawn to a stop 9, thus accurately determining the correct distance that the pin will extend from the base of the plug.
This method is thought to be more suitable for mass production in that operator positioning errors are avoided.
In an alternative construction shown in
Figure 6, a pin 1 is inserted into a socket 5 and the cover 7 is provided with an extended abutment 10 which contacts the head 2 of the pin 1 to ensure that it is held at the bottom of the socket 5 while the plastics material is injected therein. The depression thus formed in the first mould plug will be filled by the material of the second or outer moulding.
The pin 1 which has the waisted portion 11 has plastics material flowing around the waisted portion 1 1 which thereby forms an insulating cover to the pin between the base of the plug and the thickened portion of the pin 1 at the end thereof thus providing a safety facility for the plug in that the pins connected to the live and neutral wires of the socket will not be in contact with the terminals in the socket until they have been pushed home after the earth terminal has released a guard for those sockets.
After being formed by the method hereinbefore described, the plug is then placed into a further mould and a second plastics material injected thereon to encapsulate the whole pin, forming a double skin insulation and providing desirable appearance as to colour, feel and Trade Marks and such like.
In Figure 7, the pins are shown moulded within a first plastics moulding 13. Each pin 1 has a wire 14 secured thereto which leads out of the first moulding. A second plastics moulding 15 is applied to the first moulding to encapsulate the first moulding and to provide a flexible enclosure 1 6 for the wires. Said second moulding may if desired incorporate a specific cable anchorage (not illustrated in Figure 7). The neutral and live pins have the waisted part 11 so that a part of a pin is covered with the insulating plastic material of the first moulding 13. A recess 17 is formed within the moulding by the protuberance 4a to house a pair of fuse holders 18.The live wire is connected to one fuse holder while the other fuse holder is connected to the live pin. (Only one fuse holder is illustrated in Figure 7.)
In Figure 8 a perspective interior view of the mould 4 for the first plastics moulding is shown.
The mould 4 has the pins indicated by the letters
L, N and E secured therein according to any of the methods previously described.
Pin E to which wire 1 4E is connected is the earth pin of a conventional three pin plug as currently in use in the United Kingdom. Pin L is the live pin which is isolated from the live wire by a fuse and pin N is the neutral pin to which wire 1 4N is connected.
Pin L is connected by a link 20 to a terminal for one fuse holder 18 while the live wire 1 4L is connected to the other of the two fuse holders 18.
The mould interior includes the protuberance 4a to provide the recess 17 housing the fuse and fuse holder 18 (Figure 7).
The synthetic plastics material of the first moulding may be a filled nylon or any other material capable of withstanding the temperatures to which the first moulding is subjected during the second moulding process.
The synthetic plastics material of the second moulding may be polyvinyl chloride (P.V.C.) or similarly resilient electrically insulative material.
Claims (20)
1. A method of forming a non-rewirable electric plug which comprises first connecting preformed terminal pins to wires of an electrical cable.
placing said pins within a mould in desired spaced relationship, injecting a synthetic plastics material into said mould to hold the pins in said spaced relationship, removing the formed plug from the mould and placing the formed plug in a second mould and finally injecting a second plastics material to encapsulate the formed plug within the said second plastics material.
2. The method of forming a non-rewirable electric plug according to Claim 1, wherein the wires are secured to the terminal pins by welding.
3. The method of forming a non-rewirable electric plug according to Claim 1, in which the wires are secured to the terminal pins by crimping of a portion of the terminal pins over the electrical cable.
4. The method of forming a non-rewirable electric plug according to any of the preceding claims, in which there are three terminal pins, an earth pin, a live pin and a neutral pin.
5. The method of forming a non-rewirable electric plug according to Claim 4, in which the live pin is connected to one of a pair of fuse holders and said other fuse holder of the pair is connected to the live wire.
6. The method of forming a non-rewirable electric plug according to any of the preceding claims, in which the pins when inserted into the mould are held therein by a laterally moving pin.
7. The method of forming a non-rewirable electrical plug according to Claim 6, in which said laterally moving pin is actuated by hydraulic means.
8. The method of forming a non-rewirable electrical plug according to any of Claims 1 to 5, in which the pins are held in the mould by clamping means acting on the exterior of the pins extending beyond the mould.
9. The method of forming a non-rewirable electrical plug according to any of Claims 1 to 5 in which the mould itself has an abutment means acting on the uppermost portion of the pins to hold them in the desired spaced relationship.
10. The method of forming a non-rewirable electrical plug according to any of the preceding claims, wherein the interior of the mould has a protuberance to form a space in the moulded plug for a fuse holder.
1 The method of forming a non-rewirable electrical plug according to any of the preceding claims, in which at least one of the electrical termination pins has a waisted portion between the portion to which the wire is connected and the far end remote therefrom which waisted portion is surrounded by synthetic plastics material to form an insulation between the two ends of the said plug.
12. The method of forming a non-rewirable electrical plug substantially as described and illustrated herein with reference to Figures 1, 2 and 3 of the accompanying drawings.
13. The method of forming a non-rewirable electrical plug substantially as described and illustrated herein with reference to Figures 4 and 5 of the accompanying drawings.
14. The method of forming a non-rewirable electrical plug substantially as described and illustrated herein with reference to Figure 6 of the accompanying drawings.
1 5. The method of forming a non-rewirable electrical plug substantially as described and illustrated herein with reference to Figures 7 and 8 of the accompanying drawings.
16. A non-rewirable electrical plug comprising pins for engaging in, and electrically connecting with a cooperating electrical socket, wires electrically connected to said pins, a first moulding of synthetic plastics material surrounding said pins and wires to hold the same in predetermined spaced relationship and a second moulding of a further synthetic plastics material encapsulating said first moulding.
1 7. A non-rewirable electrical plug according to
Claim 16, having three pins, one for connection to earth, one for connection to the live wire and third for the neutral wire.
18. A non-rewirable electrical plug according to
Claim 17 having means for receiving a removable fuse which when placed within the plug is in circuit between the said live wire and the said live pin.
19. A non-rewirable electrical plug according to any of Claims 1 6 to 18 in which at least one of the termination pins has a waisted portion between the ends thereof which waisted portion is surrounded by synthetics material to form an insulation thereof.
20. A non-rewirable electrical plug substantially as described and illustrated herein with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08230849A GB2110587A (en) | 1981-10-30 | 1982-10-28 | Making a non-rewirable plug |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8132716 | 1981-10-30 | ||
| GB08230849A GB2110587A (en) | 1981-10-30 | 1982-10-28 | Making a non-rewirable plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2110587A true GB2110587A (en) | 1983-06-22 |
Family
ID=26281121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08230849A Withdrawn GB2110587A (en) | 1981-10-30 | 1982-10-28 | Making a non-rewirable plug |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2110587A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2172151A (en) * | 1985-01-08 | 1986-09-10 | Ashley Accessories Ltd | Electrical accessories with sleeved pins |
| GB2185156A (en) * | 1986-01-08 | 1987-07-08 | Graesslin Feinwerktech | Pin shields on electric plugs |
| GB2197138A (en) * | 1986-09-24 | 1988-05-11 | Stellar Components Limited | Electrical plugs |
| GB2237455A (en) * | 1989-09-27 | 1991-05-01 | Electricity Council | Branching electric connector |
| US5182032A (en) * | 1990-07-09 | 1993-01-26 | Paige Manufacturing Company Incorporated | Apparatus for plastic injection overmolding |
| US5462622A (en) * | 1994-06-09 | 1995-10-31 | Illinois Tool Works Inc. | Molding an electrical element within a premold element and an overmold element to provide a one-piece component |
| GB2314798A (en) * | 1996-07-01 | 1998-01-14 | Whitaker Corp | A housing accommodating an electrical component |
| US5971733A (en) * | 1998-05-13 | 1999-10-26 | Huang; Chyong-Yen | Flat plug molding device |
| EP0993925A2 (en) * | 1998-09-18 | 2000-04-19 | Micafil Ag | Positive embedding of a metallic part |
| US6056908A (en) * | 1996-10-31 | 2000-05-02 | Borg-Warner Automotive, Inc. | Integrated transmission control system |
| EP1408587A1 (en) * | 2002-10-10 | 2004-04-14 | ELCO Europe GmbH | Contact connector |
-
1982
- 1982-10-28 GB GB08230849A patent/GB2110587A/en not_active Withdrawn
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2172151A (en) * | 1985-01-08 | 1986-09-10 | Ashley Accessories Ltd | Electrical accessories with sleeved pins |
| GB2185156A (en) * | 1986-01-08 | 1987-07-08 | Graesslin Feinwerktech | Pin shields on electric plugs |
| GB2197138A (en) * | 1986-09-24 | 1988-05-11 | Stellar Components Limited | Electrical plugs |
| GB2237455A (en) * | 1989-09-27 | 1991-05-01 | Electricity Council | Branching electric connector |
| US5182032A (en) * | 1990-07-09 | 1993-01-26 | Paige Manufacturing Company Incorporated | Apparatus for plastic injection overmolding |
| CN1065107C (en) * | 1994-06-09 | 2001-04-25 | 伊利诺斯工具制造公司 | Method of molding an electrical element within a one-piece housing |
| US5462622A (en) * | 1994-06-09 | 1995-10-31 | Illinois Tool Works Inc. | Molding an electrical element within a premold element and an overmold element to provide a one-piece component |
| GB2314798A (en) * | 1996-07-01 | 1998-01-14 | Whitaker Corp | A housing accommodating an electrical component |
| US5980329A (en) * | 1996-07-01 | 1999-11-09 | The Whitaker Corporation | Electrical component and a housing for use therewith |
| GB2314798B (en) * | 1996-07-01 | 2000-10-25 | Whitaker Corp | Electrical component and a housing for use therewith |
| US6056908A (en) * | 1996-10-31 | 2000-05-02 | Borg-Warner Automotive, Inc. | Integrated transmission control system |
| US5971733A (en) * | 1998-05-13 | 1999-10-26 | Huang; Chyong-Yen | Flat plug molding device |
| EP0993925A2 (en) * | 1998-09-18 | 2000-04-19 | Micafil Ag | Positive embedding of a metallic part |
| EP0993925A3 (en) * | 1998-09-18 | 2000-10-04 | Micafil Ag | Positive embedding of a metallic part |
| EP1408587A1 (en) * | 2002-10-10 | 2004-04-14 | ELCO Europe GmbH | Contact connector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |