GB2065990A - Electrical plugs - Google Patents

Electrical plugs Download PDF

Info

Publication number
GB2065990A
GB2065990A GB7944243A GB7944243A GB2065990A GB 2065990 A GB2065990 A GB 2065990A GB 7944243 A GB7944243 A GB 7944243A GB 7944243 A GB7944243 A GB 7944243A GB 2065990 A GB2065990 A GB 2065990A
Authority
GB
United Kingdom
Prior art keywords
base member
faceplate
plug
fuse
cover
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
GB7944243A
Other versions
GB2065990B (en
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries 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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Priority to GB7944243A priority Critical patent/GB2065990B/en
Publication of GB2065990A publication Critical patent/GB2065990A/en
Application granted granted Critical
Publication of GB2065990B publication Critical patent/GB2065990B/en
Expired legal-status Critical Current

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
    • 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
    • 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
    • H01R13/46—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
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/652—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding   with earth pin, blade or socket
    • 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
    • H01R24/30—Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable with additional earth or shield contacts

Landscapes

  • Fuses (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

A plug comprises an assembly of a faceplate 10 and a base 12 through which conductor pins 16 and 18 extend. The faceplate is secured adjacent an outer side 24 of the base and provides insulating sleeves 30 which surround portions of the live and neutral pins. A pivotally mounted fuse cover 38 may be provided to guard access, from the outer side of the base, to a fuse cavity 40 in the base. A base cover 34 is secured, e.g. by welding, to the assembly of the base and the faceplate to prevent access to the lead connections on the inner side of the base. <IMAGE>

Description

SPECIFICATION Electrical plugs This invention is concerned with electrical plugs, particularly electrical plugs which comprise insulating sleeves which surround portions of live and neutral conductor pins projecting from body portions of the plugs.
It is a criticism of many plugs that it is possible to touch accidentally the live and neutral pins of a plug when the pins are partially inserted into a socket, with consequent danger of receiving an electric shock. Danger may particularly arise when the plug is tilted during engagement with the socket. To reduce the danger it is known to provide insulating sleeves around portions of the pins which are otherwise exposed and liable to be accidentally touched.
It is an object of the invention to provide an improved construction of electrical plug comprising insulating sleeves.
According to the invention an electrical plug comprises an assembly of a faceplate member and a base member, through which assembly live and neutral conductor pins of the plug extend to an inner side of the base memberforelectrical connection to leads of a flexible cord, the faceplate member being secured adjacent an outer side of the base member and comprising projecting sleeve portions which surround portions of the live and neutral pins outside the base member, and the plug comprising also a cover member which is secured to the assembly of the base member and the faceplate member to prevent access to the inner side of the base member.
The plug may comprise live, neutral and earth conductor pins which all extend through the faceplate member and the base member, though usually only the live and neutral pins would be sleeved by the faceplate member.
Preferably the plug comprises a pivotally mounted fuse cover which exposes, through an aperture in the faceplate member, a fuse cavity in the base member when in an open position; in use of the plug a fuse would be mounted in the fuse cavity, to connect electrically the live pin with a live lead of a flexible cord. When in a closed position the fuse cover would prevent access through the aperture in the faceplate member to the fuse cavity. In a preferred arrangement, trunnions of the fuse cover are retained between the faceplate member and the base member, and latch means, which may comprise co-operating components of the fuse cover and one of the faceplate member and the base member, is preferably provided to releasably retain the fuse cover in its closed position.In one preferred arrangement the latch means comprises a lip portion of the fuse cover which is arranged to snap past a lip portion of the faceplate member for retention of the fuse cover in its closed position.
The cover member can be secured by any suitable means. However, where a non-rewirable plug is to be provided, the cover member is preferably secured by a high frequency welding technique; by a "non-rewirable plug", where the term is used herein, is meant an assembly of a plug and a flexible cord in which the plug, and leads of the cord electrically connected to conductors within the plug, are permanently assembled together to prevent, at least without causing damage to the assembly, access to the lead connections within the plug.
Preferably the base member, the faceplate member, and the fuse cover are each moulded of an electrically insulating plastics material.
There now follows a description, to be read with reference to the accompanying drawings, of a non-rewireable electrical plug which illustrates the invention by way of example.
In the accompanying drawings: Figure 1 is a longitudinal section through the plug, the section being taken through earth and neutral conductor pins of the plug; Figure 2 is a top plan view of a base member of the plug; Figure 3 is a view in section on the line Ill-Ill of Figure 2; Figure 4 is a top plan view of a faceplate member of the plug; Figure 5 is a view in section on the line V-V of Figure 4; Figure 6 is a bottom plan view of a fuse cover of the plug; and Figure 7 is a view in end elevation of the fuse cover.
The plug (which conforms with British Standard No. 1363) comprises, as seen in Figure 1, an assembly of a faceplate member 10 and a base member 12 through which live 14, neutral 1 6 and earth 1 8 conductor pins of the plug extend to an inner side (indicated generally at 20) of the base member for electrical connection to leads of a flexible cord 22. The faceplate member 10 is secured adjacent an outer side (indicated generally at 24) of the base member, between the base member and shoulders 26 of the three pins and comprises two projecting sleeve portions 28 and 30 which surround reduced portions of the live and neutral pins outside the base member (but leave outer end portions 32 of the pins exposed); the reduced portions, of the pins, and the interiors of the sleeve portions, are of a dumb-bell shape in cross-section.The plug comprises also a cover member 34 which is secured to the assembly of the base member 12 and the faceplate member 10 in order to enclose the otherwise exposed electrical connections, to the leads of the cord 22, adjacent the inner side 20 of the base member. A sleeve 36 is secured between the cover member 34 and the base member 12 to protect the flexible cord 22. A pivotally mounted fuse cover 38 prevents access, when in a closed position (as shown in Figure 1), to a fuse cavity 40 in the base member 1 2 to which there is entry from the outer side 24 of the base member. The faceplate member 10, the base member 12, the cover member 34 and the fuse cover 38 are each moulded of an electrically insulating nylon material.
The base member 12 (Figures 1 to 3) comprises a base portion 42 and a platform portion 44 upstanding from the base portion.
Three passages 46 (Figures 2 and 3) through the platform portion 44 are adapted to receive inner end portions of the three conductor pins 14, 1 6 and 18, for electrical connections to be made, in a conventional manner, adjacent the inner side 20 of the base member. Apertures 47 are provided, extending through the platform portion 44 from the inner side 20 to the fuse cavity 40, for the mounting of fuse clips 49. The base portion comprises a clamping portion 48 to embrace half the circumference of the cord protecting sleeve 36; the cover member 34 is similarly formed so that the sleeve can be clamped and retained therebetween.A recess 50 in the outer side 24 of the base member 12 is arranged to receive the faceplate member 10, and the base member and the faceplate member, when assembled, together provide a step 52 which extends around the periphery of the assembly to engage in a complementary recess in the cover member 34.
The faceplate member 10 is shown in more detail in Figures 4 and 5. Three apertures 54 are provided to allow the conductor pins 14, 1 6 and 1 8 to extend through the faceplate member to the base member 12, two of the apertures extending through the sleeve portions 28 and 30 to receive the live and neutral conductor pins. A large, generally T-shaped, aperture 56 is formed in the faceplate member so as to be opposite the fuse cavity 40 when the faceplate member is assembled with the base member. The faceplate member comprises two lip portions 58 for retention of the fuse cover 38 in its closed position as hereinafter described.
The fuse cover 38 is shown in more detail in Figures 6 and 7, and is of such profile as to fit closely within the aperture 56 in the faceplate member. The fuse cover 38 comprises two trunnion portions 60 by means of which it is arranged to be pivotally mounted. The fuse cover also comprises lip portions 62 arranged to cooperate with the lip portions 58 of the faceplate member, for retention of the fuse cover in its closed position, and a lifting tab portion 64 by which it can be manually released from its closed position and moved to an open position in which access can be gained, through the aperture 56 in the faceplate member 10, to the fuse cavity 40.
Assembly of the plug is as follows. The faceplate member 10 is fitted into the recess 50 in the base member 12, with the trunnion portions 60 of the fuse cover 38 retained between side shoulders 66 of the faceplate member and surfaces on the outer side 24 of the base member.
The live, neutral and earth conductor pins are then inserted through the apertures 54 in the face plate member, and through the apertures 46 in the base member until the shoulders 26 of the pins abut the faceplate member; the shoulders 26 of the live and neutral pins abut outer end faces of the sleeve portions 28 and 30. Innermost end portions of the conductor pins are thus exposed adjacent the inner side 20 of the base member, and are rivetted over to connect electrically the pins to the leads of the cord 22 in a conventional manner; the earth and neutral pins are connected directly to terminations on the earth and neutral leads of the cord, and the live pin 14 is connected electrically with the live lead of the cord by way of the fuse slips 49 and a fuse 51 extending between the clips within the fuse cavity 40.The electrical connections retain the conductor pins within the base member, The sleeve 36, mounted on the cord 22, is positioned in the clamping portion 48 of the base member, and the cover member 34 is positioned over the sleeve and the base member.
The cover member 34 is secured by a high frequency welding technique, so that it becomes welded to the assembly of the faceplate member 10 and the base member 12 all along the step 52.
The cover member 34 cannot be removad without damaging the plug, since it is permanently welded in position. Accordingly no access can be gained to the exposed conductors adjacent the inner side 20 of the base member 1 2. For replacement of the fuse 51, the fuse cover 38 can be moved manually to its open position to expose the fuse 51 in the fuse cavity 40 through the aperture 56 in the faceplate member1 0. In returning the fuse cover to its closed position, the lip portions 62 of the fuse cover are snapped past: the lip positions 58 of the faceplate member 10.

Claims (7)

1. An electrical plug comprising an assembly of a faceplate member and a base member, through which assembly live and neutral conductor pins of the plug extend to an inner side of the base member for electrical connection to leads of a flexible cord, the faceplate member being secured adjacent an outer side of the base member and comprising projecting sleeve portions which surround portions of the live and neutral pins outside the base member and the plug comprising also a cover member which is secured to the assembly of the base member and the faceplate member to prevent access to the inner side of the base member.
2. A plug according to Claim 1 comprising a pivotally mounted fuse cover which when in an open position exposes, through an aperture in the faceplate member, a fuse cavity in the base member and which when in a closed position prevents access through the aperture in the faceplate member to the fuse cavity.
3. A plug according to Claim 2 in which trunnions of the fuse cover are retained between the faceplate member and the base member.
4. A plug according to either of Claims 2 and 3 comprising latch means comprising portions of the fuse cover and one of the faceplate member and the base member arranged to co-operate to releasably retain the fuse cover in its closed position.
5. A plug according to Claim 4 in which the latch means comprises a lip portion of the fuse cover which is arranged to snap past a lip portion of the faceplate member for retention of the fuse cover in its closed position.
6. A plug according to any one of Claims 1 to 5 in which the cover member is welded to the assembly of the base member and the faceplate member to prevent access to the inner side of the base member, the plug being a non-rewirable plug.
7. An electrical plug constructed and arranged substantially as hereinbefore described with reference to the accompanying drawings.
GB7944243A 1979-12-21 1979-12-21 Electrical plugs Expired GB2065990B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7944243A GB2065990B (en) 1979-12-21 1979-12-21 Electrical plugs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7944243A GB2065990B (en) 1979-12-21 1979-12-21 Electrical plugs

Publications (2)

Publication Number Publication Date
GB2065990A true GB2065990A (en) 1981-07-01
GB2065990B GB2065990B (en) 1983-09-21

Family

ID=10510027

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7944243A Expired GB2065990B (en) 1979-12-21 1979-12-21 Electrical plugs

Country Status (1)

Country Link
GB (1) GB2065990B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174255A (en) * 1985-04-23 1986-10-29 Bsr Sleeved electrical plug pins
US4679884A (en) * 1986-05-07 1987-07-14 Litton Systems, Inc. Fused electrical plug
DE4239721A1 (en) * 1992-11-26 1994-06-01 Taller Gmbh Plug bridge for an electrical contact plug consisting of an insulating body and a protective cap
WO2011029605A1 (en) * 2009-09-09 2011-03-17 Thomas Waible Plug connector and method for producing a plug connector

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174255A (en) * 1985-04-23 1986-10-29 Bsr Sleeved electrical plug pins
US4679884A (en) * 1986-05-07 1987-07-14 Litton Systems, Inc. Fused electrical plug
DE4239721A1 (en) * 1992-11-26 1994-06-01 Taller Gmbh Plug bridge for an electrical contact plug consisting of an insulating body and a protective cap
GB2273006A (en) * 1992-11-26 1994-06-01 Taller Gmbh Electrical plug insulator and protective cap arrangement
GB2273006B (en) * 1992-11-26 1996-08-07 Taller Gmbh Plug bridge comprising an insulator and a protective cap for an electrical plug
WO2011029605A1 (en) * 2009-09-09 2011-03-17 Thomas Waible Plug connector and method for producing a plug connector
CN102668268A (en) * 2009-09-09 2012-09-12 托马斯·魏贝尔 Plug connector and method for producing a plug connector

Also Published As

Publication number Publication date
GB2065990B (en) 1983-09-21

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Legal Events

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