GB2173361A - An improved electric plug assembly - Google Patents

An improved electric plug assembly Download PDF

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Publication number
GB2173361A
GB2173361A GB08608062A GB8608062A GB2173361A GB 2173361 A GB2173361 A GB 2173361A GB 08608062 A GB08608062 A GB 08608062A GB 8608062 A GB8608062 A GB 8608062A GB 2173361 A GB2173361 A GB 2173361A
Authority
GB
United Kingdom
Prior art keywords
pin
hole
plug assembly
electric plug
axis
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
GB08608062A
Other versions
GB2173361B (en
GB8608062D0 (en
Inventor
Alan John Bangay
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.)
Balfour Beatty PLC
Original Assignee
BICC PLC
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 BICC PLC filed Critical BICC PLC
Publication of GB8608062D0 publication Critical patent/GB8608062D0/en
Publication of GB2173361A publication Critical patent/GB2173361A/en
Application granted granted Critical
Publication of GB2173361B publication Critical patent/GB2173361B/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
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
    • H01R4/183—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section
    • 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

Abstract

In a 13 amp moulded-on electric plug assembly, each of the pins 1 of rectangular cross-section has, adjacent that one of its ends that does not protrude from the plug body, a hole 2 in or extending through the pin. A bare end 4 of one of the cable conductors 3 is positioned in and throughout the length of the hole 2 and a part 5 of the pin bounding the hole is distorted in a direction transverse to the axis of and throughout the length of the hole to such an extent that the conductor end 4 is permanently clamped to the pin without completely shearing any portion of the pin material from the pin. <IMAGE>

Description

SPECIFICATION An improved electric plug assembly This invention relates to electric plug assemblies and is especially, but not exclusively, concerned with electric plug assemblies for use in domestic and similar wiring systems.
In the specification of our British Patent No: 2072435B, there is described and claimed an improved electric plug assembly comprising an insulating plug body from which at least two plug pins protrude and a length of flexible insulated multi-conductor cable whose electric conductors are permanently electrically connected to the associated plug pins, wherein at least one of the plug pins has, adjacent that one of its ends which does not protrude from the plug body, a hole extending through the pin in a direction transverse to the pin axis and wherein a bare end of one of the cable conductors is positioned in the hole and a part of the pin bounding the hole is distorted in a direction transverse to the axis of the hole to such an extent that the bare end of the conductor is permanently clamped to the pin without shearing any portion of the pin material from the pin.
It is an object of the present invention to provide a modified form of the improved electric plug assembly described and claimed in our aforesaid patent which is especially suitable for use in a 13amp electric wiring system.
According to the invention, the modified electric plug assembly comprises an insulating plug body from which protrude at least two plug pins each having a transverse cross-section of approximately rectangular shape and a length of flexible insulated multi-conductor cable whose electric conductors are permanently electrically connected to the associated plug pins, wherein at least one of the plug pins has, adjacent that one of its ends which does not protrude from the plug body, a hole in or extending through the pin and wherein a bare end of one of the cable conductors is positioned in and throughout the length of the hole and a part of the pin bounding the hole is distorted in a direction transverse to the axis of and throughout substantially the entire length of the hole to such an extent that the bare end of the conductor is permanently clamped to the pin without completely shearing any portion of the pin material from the pin.
The hole in the or each pin may be a blind hole extending lengthwise of the pin from said end of the pin and, in this case, the axis of the blind hole may lie between the longitudinal axis of the pin and a side of the pin but, preferably, the hole in the or each pin extends through the pin in a direction transverse to the pin axis and, in this preferred case, preferably the axis of the hole extends substantially normal to the longitudinal axis of the pin. Where the pin is a line pin, preferably the axis of the hole extends substantially parallel to the wider side faces of the pin; where the pin is an earth pin, preferably the axis of the hole extends substantially parallel to the narrower side faces of the pin.
Where the axis of the hole in each pin is transverse to the pin axis, the end part of the pin bounding the hole may be distorted in a direction substantially parallel to the pin axis and throughout substantially the entire length of the hole to clamp the bare end of the conductor to the pin but, preferably, a side of the end part of the pin bounding the hole is distorted in a direction substantially normal to the pin axis and throughout substantially the entire length of the hole for this purpose. In the latter case, preferably the axis of the hole lies intermediate of the longitudinal axis of the pin and the side of the end part which is distorted.
At the open end, or at one of the open ends, of the hole in the or each pin, preferably the hole is countersunk or otherwise recessed to facilitate introduction of the bare end of a conductor.
Preferably, the or each pin is made of a brass of which the copper content is not less than 61% by weight and the lead content does not exceed 2% by weight.
The arrangement hereinbefpre described of permanently connecting the conductors of a flexible cable to plug pins of substantially rectangular transverse cross-section of an electric plug assembly is especially, but not exclusively, applicable to an electric plug assembly of the kind in which the plug pins protrude through holes in a preformed body of electrically insulating material, the conductors of a length of flexible insulated multi-conductor cable are permanently electrically connected to associated plug pins, and a moulded plug body of electrically insulating material wholly or partially encapsulates the preformed body and the plug pins and associated conductor connections with an appropriate length of each pin protruding from the plug assembly and is permanently bonded to the insulating covering of an adjacent part of the length of cable.An electric plug assembly of this kind to which the present invention is especially applicable is described in the specification of our Patent No. 2050076 B.
The arrangement hereinbefore described of permanently connecting the conductors of a flexible cable to plug pins of substantially rectangular transverse cross-section of an electric plug assembly is also applicable to an electric plug assembly of the kind in which the insulating plug body is built up of two preformed body parts which are welded or otherwise permanently secured together in such a way that they cannot be separated without effecting permanent damage to the plug assembly.
Distortion of an end part of a plug pin in a direction transverse to the axis of and throughout substantially the entire length of a hole in said end part of the pin in which the bare end of an electric conductor is positioned to clamp the- bare end of the conductor permanently to the pin without completely shearing any portion of the pin material from the pin, is preferably effected by controlled impact punching of an elongate depression in the side of the pin of such a depth as- to clamp the bare end of the electric conductor against the boundary wall of the hole.
The invention will be further illustrated by a description, by way of example, of a preferred 13A three-pin electric plug assembly with reference to the accompanying drawing, in which: Figure 1 is an isometric view of a plug pin of rectangular transverse cross-section with a cable conductor permanently electrically connected thereto, and Figure 2 is an isometric view of the preformed body of the plug assembly before the plug body is moulded thereon.
Referring to Figure 1, a solid plug pin 1 of rectangular transverse cross-section has, adjacent one end, a hole 2 which extends through the pin in a direction substantially normal to the pin axis and parallel to the wider side face of the pin. A bare end 4 of a cable conductor 3 is positioned in and throughout the length of the hole 2 and is permanently clamped to the boundary wall of the hole by distortion of a neighbouring side part of the pin caused by punching in and across the side face of the pin in a direction normal to the pin axis and throughout the length of the hole, without shearing any portion of the pin material from the pin, an elongate.depression 5.
As will be seen on referring to Figure 2, a preformed body 11 of moulded plastics material has extending through the body three holes in which two line pins 14 and an earth pin 15, each of solid form and of rectangular transverse cross-section, are inserted from the front face 12 of the body so that they pro- trude from the rear face of the body with shoulders 16, 17 on the pins bearing against the front face.The live conductor 21 of a flexible cable 20 is connected by a crimped connection 24 to one spring contact 25 of a pair of spring contacts which project into a cartridge fuse recess 26 in the rear face of the preformed body 11; the neutral conductor 22 of the cable is permanently electically connected to one line pin 14 in the manner illustrated in Figure 1; and the earth conductor 23 of the cable is permanently electrically connected to the earth pin 1 by the method illustrated in Figure 1. The other line pin 14 is connected direct to the other of the spring contacts 25.
A moulded body of electrically insulating material (not shown) wholly encapsulates the conductor connections and an underlying preformed cover (not shown) attached to the preformed body 11 and overlying the conductor connections, partially encapsulates the preformed body with an appropriate length of each pin protruding from the preformed body, and is permanently bonded to the insulating covering of a part of the lengtH of cable.

Claims (11)

1. An electric plug assembly comprising an insulating plug body from which protrude at least two plug pins each having a transverse cross-section of approximately rectangular shape and a length of flexible insulated multiconductor cable whose electric conductors are permanently electrically connected to the associated plug pins, wherein at least one of the plug pins has, adjacent that one of its ends which does not protrude from the plug body, a hole in or extending through the pin and wherein a bare end of one of the cable conductors is positioned in and throughout the length of the hole and a part of the pin bounding the hole is distorted in a direction transverse to the axis of and throughout substantially the entire length of the hole to such an extent that the bare end of the conductor is permanently clamped to the pin without completely shearing any portion of the pin material from the pin.
2. An electric plug assembly as claimed in Claim 1, wherein the hole in the or each pin is a blind hole extending lengthwise of the pin from said end of the pin.
3. An electric plug assembly as claimed in Claim 2, wherein the axis of the blind hole in the or each pin lies betweenthe longitudinal axis of the pin and a side- of the pin.
4. An electric plug assembly as claimed in Claim 1, wherein the hole in the or each pin extends through the pin in a direction transverse and substantially normal to the longitudinal axis of the pin.
5. An electric plug assembly as claimed in Claim 4 in which the pin is a line pin, wherein the axis of the hole extends substantially parallel to the wider side faces of the pin.
6. An electric plug assembly as claimed in Claim 4 in which the pin is an earth pin, wherein the axis of the hole extends substantially parallel to the narrower side faces of the pin.
7. An electric plug assembly as claimed in any one of Claims 4 to 6, wherein a side of the end part of the pin bounding the hole is distorted in a direction substantially normal to the pin axis and throughout substantially the entire length of the hole to- clamp the bare end of the conductor to the pin.
8. An electric plug assembly as claimed in Claim 7, wherein the axis of the hole lies intermediate of the longitudinal axis of the pin and the side of the end part which is distorted.
9. An electric plug assembly as claimed in any one of the preceding Claims, wherein at the open end, or at one of the open ends, of the hole in the or each pin, the hole is countersunk or otherwise recessed to facilitate introduction of the bare end of a conductor.
10. An electric plug assembly as claimed in any one of the preceding Claims, wherein the or each pin is made of a brass of which the copper content is not less than 61% by weight and the lead content does not exceed 2% by weight.
11. An electric plug assembly substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
GB08608062A 1985-04-04 1986-04-02 An improved electric plug assembly Expired GB2173361B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB858508851A GB8508851D0 (en) 1985-04-04 1985-04-04 Electric plug assembly

Publications (3)

Publication Number Publication Date
GB8608062D0 GB8608062D0 (en) 1986-05-08
GB2173361A true GB2173361A (en) 1986-10-08
GB2173361B GB2173361B (en) 1988-11-09

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
GB858508851A Pending GB8508851D0 (en) 1985-04-04 1985-04-04 Electric plug assembly
GB08608062A Expired GB2173361B (en) 1985-04-04 1986-04-02 An improved electric plug assembly

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB858508851A Pending GB8508851D0 (en) 1985-04-04 1985-04-04 Electric plug assembly

Country Status (1)

Country Link
GB (2) GB8508851D0 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9402349U1 (en) * 1994-02-12 1994-03-31 Pistor & Boss Gmbh Device for displaying residual heat on hot plates in electric cookers
GB2279821A (en) * 1993-06-08 1995-01-11 B & R Electrical Plc Shearing clamping connection for a plug pin and wire
ES2174711A1 (en) * 2000-06-23 2002-11-01 Habas Angel Antoli Connection devices for feeding of the elevator mechanisms of buried containers.
DE102006002588A1 (en) * 2006-01-18 2007-07-19 Phoenix Contact Gmbh & Co. Kg Electrical plug-in connector for use in e.g. switch cabinet, has wires inserted into cross-hole and electrically and mechanically connected with contact units by mechanical pressing of contact unit in area of cross-hole
WO2011121271A1 (en) 2010-03-30 2011-10-06 Raymond Wild Electrical connection

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072435A (en) * 1980-03-21 1981-09-30 Bicc Ltd Electric plug assembly

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072435A (en) * 1980-03-21 1981-09-30 Bicc Ltd Electric plug assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2279821A (en) * 1993-06-08 1995-01-11 B & R Electrical Plc Shearing clamping connection for a plug pin and wire
GB2279821B (en) * 1993-06-08 1997-07-02 B & R Electrical Plc A terminal assembly for a non-rewirable electric plug
DE9402349U1 (en) * 1994-02-12 1994-03-31 Pistor & Boss Gmbh Device for displaying residual heat on hot plates in electric cookers
ES2174711A1 (en) * 2000-06-23 2002-11-01 Habas Angel Antoli Connection devices for feeding of the elevator mechanisms of buried containers.
DE102006002588A1 (en) * 2006-01-18 2007-07-19 Phoenix Contact Gmbh & Co. Kg Electrical plug-in connector for use in e.g. switch cabinet, has wires inserted into cross-hole and electrically and mechanically connected with contact units by mechanical pressing of contact unit in area of cross-hole
WO2011121271A1 (en) 2010-03-30 2011-10-06 Raymond Wild Electrical connection

Also Published As

Publication number Publication date
GB8508851D0 (en) 1985-05-09
GB2173361B (en) 1988-11-09
GB8608062D0 (en) 1986-05-08

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030402