GB2186747A - Manufacturing method for insulated pins for electric plugs - Google Patents

Manufacturing method for insulated pins for electric plugs Download PDF

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Publication number
GB2186747A
GB2186747A GB08603983A GB8603983A GB2186747A GB 2186747 A GB2186747 A GB 2186747A GB 08603983 A GB08603983 A GB 08603983A GB 8603983 A GB8603983 A GB 8603983A GB 2186747 A GB2186747 A GB 2186747A
Authority
GB
United Kingdom
Prior art keywords
pin
grooves
pins
plug body
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.)
Granted
Application number
GB08603983A
Other versions
GB8603983D0 (en
GB2186747B (en
Inventor
Chi Wing Fok
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.)
On Tat Bakelite Electric Works Ltd
Original Assignee
On Tat Bakelite Electric Works 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 On Tat Bakelite Electric Works Ltd filed Critical On Tat Bakelite Electric Works Ltd
Priority to GB8603983A priority Critical patent/GB2186747B/en
Publication of GB8603983D0 publication Critical patent/GB8603983D0/en
Publication of GB2186747A publication Critical patent/GB2186747A/en
Application granted granted Critical
Publication of GB2186747B publication Critical patent/GB2186747B/en
Expired legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0027—Gate or gate mark locations
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Connector Housings Or Holding Contact Members (AREA)

Abstract

An electric plug pin has a lower portion 7 and an upper portion 12 connected by a narrow cross-section portion 13 to define opposing grooves 15 and 16. The groove 16 is longer than the groove 15 so that when the pin is mounted in a mould, plastics material can be injected through a gate located at arrow B for providing said insulated faces. The extra length of side grooves 16 compared with grooves 15 allows the gate to be located in a position where any faults occuring around the gate are not exposed to view when the pin is mounted in the electric plug body. <IMAGE>

Description

SPECIFICATION Manufacturing Method for Insulated Pins for Electric Plugs This invention invention relates to a method of manufacturing rectangular pins for mounting in an electric plug body and in particular wherein the exposed portions of the pins have insulated faces adjacent the plug body.
GB-1 181 370 describes an electric plug wherein the current carrying pins have insulated material moulded thereon to provide an insulating shield extending around and along substantially one half of the length of the pin projecting from the plug body. In this way, a person introducing or withdrawing a plug to and from a socket cannot contact the current carrying portion of the pin because of that insulation. The pins are formed by firstly cutting off parts of an extruded section of metal and secondly cutting shallow grooves in the sides by milling or brooching. The insulation can be moulded around the pin by injection moulding with the pins ejected from the mould. Alternatively, two mould parts can be employed to form the insulation.
In both cases, there is concern that flash spews in the form of a thin film or layer can remain adhered to the current carrying portion of the pin.
It is an object of the present invention to provide a method of manufacturing such insulated rectangular pins for mounting in an electric plug body wherein the chances of such flash spews are reduced.
According to one aspect of the invention there is provided a method of manufacturing rectangular pins for mounting in an electric plug body, wherein the pins have insulated faces adjacent the plug body when mounted therein, the method comprising the steps: (a) forming said pins with a groove in each side at a location whereby, in use, the grooves are at least adjacent the plug body and wherein one to three of said grooves extend further into said body relative to the other grooves; (b) locating the pins in a mould; (c) injecting a plastics material into said mould via a gate provided in said extended groove(s); (d) demoulding the pin.
In this way, the insulating plastics material is inserted via the extended portion which is not visually apparent when the pin is mounted in the plug body. This gives a more pleasing and more precise looking plug pin. Furthermore, any flash spews that still occur coat the plug pin within the plug body. This does not cause problems since contact wires connected to the pin are connected by means of screws or rivets applied against a conductor which is inserted through an aperture formed in the pin. The actual surfaces responsible for connecting the electric plug pin to the contact surfaces of a plug socket to not have any significant flash spews. Finally, any faults occurring around the gate are not exposed to view when the pin is mounted in the electric plug body.
Preferably, two of said grooves are formed to extend further into said plug body relative to the other. This allows a symmetrical injection of plastics material during the manufacturing process.
According to another aspect of the invention there is provided a plug# pin suitable for use in the aforementioned method of manufacturing rectangular pins comprising:~ a rectangular cross section pin formed with a groove in each side at a location wherein the grooves are at least adjacent the plug body mounted therein, and one to three of said grooves being formed to extend further into said plug body when mounted therein relative to the other grooves.
Examples of the present invention will now be described with reference to the accompanying drawings, in which:~ Figure 1 illustrates an electric plug embodying the present invention, Figure 2 illustrates a plug pin embodying the present invention, Figures 3 illustrates the plug pin of Figure 2 after application of insulation thereto.
Referring to Figure 1, an electric plug 1 includes three pins 2, 3 and 4 extending from a lower surface 5 thereof. The pin 2 comprises an earth pin whereas the pins 3 and 4 are identical current carrying pins. It will be appreciated that the specific number of pins employed in Figure 1 is not to be considered to limit the present invention in any way. Each of the current carrying pins includes an insulated portion 6 located adjacent the plug body and extending substantially half-way down the exposed portion of the current carrying pins so that only a lower portion 7 of each pin is available to make contact with contacting surfaces of a reciprocal electric socket.
Referring now to Figures 2 and 3, the electric pin 3 or 4 is formed from an elongate bar of conductive metal extruded from an extrusion head in the direction of arrow A. Each pin is formed by cutting off a length of that bar accordingly, the side face 10 of the pin is a cut surface whereas the top face 11 and bottom face (not shown) are surfaces defined by the extrusion head. As can be seen from Figure 2, the lower portion 7 of the pin connects to an upper portion of the pin 12 via a reduced cross section intermediate portion 13. The upper section 12 comprises a generally square shaped portion having an aperture 14 drilled therethrough for receiving a conductor in known way when the pin is mounted in an electric plug and a portion 17 as shown.The intermediate portion 13 comprises respective grooves 15 on upper and lower faces of the pin and having a length (d) and respective grooves 16 on the side faces and having length (e). It will be apparent that length (e) is greater than length (d). The groove 16 is formed by milling (or the like) the cut surface 10 to a required groove depth (f). The length (d) and groove depth (g) are defined by the extrusion head. Typically, depth (g) corresponds to depth (f).
The pin shown in Figure 2 is located in a mould having surfaces defining a cross section corresponding to the end portion 7 right up to and including portion 7. A gate for injection of insulating plastics material is located on the mould to lie substantially in or on the extra portion of the groove 16 which extends beyond the groove 5. The position of the gate indicated generally by the letter (B) in Figures 2 and 3. Figure 3 shows the pin of Figure 2 after moulding of the insulation thereon. Once plastics material is injected into the appropriate mould, solidified and the pin demoulded the general cross section of the lower section 7 of the pin extends right the way to the upper square portion 12. It can be seen that the insulation extends further up the pin on the side faces 16 than the top faces 13.
Thus, any residual plastics material from the gate position is located at the upper portion of the side faces 16. When the pin of Figure 3 is mounted in a plug body as shown in Figure 1, then only the pin on the left hand side of line C-C as shown in Figure 3 is exposed.
Consequently, it can be seen that any fault occurring in the insulation in the region of the gate B does not show when the pin is mounted in the electric plug body. Furthermore, any flash spews occurring at the gate region are also not exposed.
This gives the electric plug a superior visual appearance compared with hitherto known such plugs.
It will be apparent that the present invention is not limited to plug pins having the specific cross section shown in the drawings and the extended grooves can be formed in one to three of the plug pins shown in the drawings.

Claims (5)

1. A method of manufacturing rectangular pins for mounting in an electric plug body wherein the pins have insulated faces adjacent the plug body when mounted therein, the method comprising the steps of: (a) forming said pins with a groove in each side at a location whereby, in use, the grooves are at least adjacent the plug body and wherein one to three of said grooves extend further into said body relative to the other grooves, (b) injecting plastics material into said mould via a gate provided in said elongated portion, (d) demoulding the pin.
2. A method as claimed in claim 1 wherein two of said grooves extend further into said body relative to the other grooves.
3. A plug pin suitable for use in any preceding claim comprising an extruded rectangular cross section pin formed with a groove in each side at a location wherein the grooves are at least adjacent the plug body when mounted therein, and one to three of said grooves being formed to extend further into and plug body when mounted therein relative to the other grooves.
4. A method of manufacturing rectangular pins for mounting in an electric plug body, wherein the pins have insulated faces adjacent the plug body when mounted therein, substantially as herein described with reference to the accompanying drawings.
5. A plug pin substantially as herein described with reference to the accompanying drawings.
GB8603983A 1986-02-18 1986-02-18 Manufacturing method for insulated pins for electric plugs Expired GB2186747B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8603983A GB2186747B (en) 1986-02-18 1986-02-18 Manufacturing method for insulated pins for electric plugs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8603983A GB2186747B (en) 1986-02-18 1986-02-18 Manufacturing method for insulated pins for electric plugs

Publications (3)

Publication Number Publication Date
GB8603983D0 GB8603983D0 (en) 1986-03-26
GB2186747A true GB2186747A (en) 1987-08-19
GB2186747B GB2186747B (en) 1989-11-01

Family

ID=10593259

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8603983A Expired GB2186747B (en) 1986-02-18 1986-02-18 Manufacturing method for insulated pins for electric plugs

Country Status (1)

Country Link
GB (1) GB2186747B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1105943A1 (en) * 1998-08-11 2001-06-13 Motorola, Inc. Prong for adapter plug for international use
EP1331696A3 (en) * 2002-01-28 2004-10-13 FRIWO Gerätebau GmbH Electrical press-fitt connector and producing method
CN101364677A (en) * 2008-10-14 2009-02-11 刁鹏程 Improved type stage shaped plug terminal and production method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1105943A1 (en) * 1998-08-11 2001-06-13 Motorola, Inc. Prong for adapter plug for international use
EP1105943A4 (en) * 1998-08-11 2003-08-20 Motorola Inc Prong for adapter plug for international use
EP1331696A3 (en) * 2002-01-28 2004-10-13 FRIWO Gerätebau GmbH Electrical press-fitt connector and producing method
CN101364677A (en) * 2008-10-14 2009-02-11 刁鹏程 Improved type stage shaped plug terminal and production method thereof
CN101364677B (en) * 2008-10-14 2013-10-02 濠玮精密科技（深圳）有限公司 Improved type stage shaped plug terminal and production method thereof

Also Published As

Publication number Publication date
GB8603983D0 (en) 1986-03-26
GB2186747B (en) 1989-11-01

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20060217