GB2095047A - Electrical connections - Google Patents
Electrical connections Download PDFInfo
- Publication number
- GB2095047A GB2095047A GB8108025A GB8108025A GB2095047A GB 2095047 A GB2095047 A GB 2095047A GB 8108025 A GB8108025 A GB 8108025A GB 8108025 A GB8108025 A GB 8108025A GB 2095047 A GB2095047 A GB 2095047A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrical connector
- cable
- pin
- connector
- fuse
- 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- Withdrawn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
-
- 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
- H01R4/28—Clamped connections, spring connections
- H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
- H01R4/489—Clamped connections, spring connections utilising a spring, clip, or other resilient member spring force increased by screw, cam, wedge, or other fastening means
-
- 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
- H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
- H01R4/2404—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation
- H01R4/2408—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation actuated by clamping screws
-
- 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
- H01R13/512—Bases; Cases composed of different pieces assembled by screw or screws
-
- 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
- H01R24/30—Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable with additional earth or shield 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
- 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
- H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
-
- 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
- H01R4/26—Connections in which at least one of the connecting parts has projections which bite into or engage the other connecting part in order to improve the contact
Landscapes
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
An electrical connector 1, such as a three-pin plug, has two body parts which are relatively movable into abutment for assembly, a terminal 8 carried by one of the body parts and exposing a contact surface 8a towards the other body part, and resiliently- compressible means, e.g. a resilient pad 22, disposed between the terminal and at least one of the body parts, such that during movement into abutment of the body parts a flexible electrical connector 10 seated on the contact surface becomes pressed onto the contact surface as a result of resilient deformation of the compressible means. Provision may be made in a similar manner for clamping of a cable 11, and/or for holding an internal component such as a fuse 13 in contact with an electrical conductor. Resilient ears 9 guide the connector 10. <IMAGE>
Description
SPECIFICATION
Electrical connector
This invention relates to electrical connectors and, whilst it is not restricted to such use, it is particularly adapted to the conventional three-pin square-pin mains plug.
The object of the invention is to provide an improved construction of electrical connector including various parts which, upon assembly fully one with the other, automatically provide clamping engagement of a flexible conductor in good electrical contact with a terminal.
According to the present invention an electrical connector comprises a first part and a second part which are relatively movable into abutment for assembly, a terminal seated in one part and having a contact surface exposed towards the other part, and resiliently compressible means disposed between the terminal and at least one of said parts such that with a flexible connector seated on said contact surface the act of moving the two parts together into abutment causes the flexible connector to be pressed onto the contact surface by the resilient deformation of the resiliently compressible means.
The resiliently compressible means may be a portion of the respective part, but in a preferred form is a resilient element seated in or secured on the respective part made of rigid material.
The two parts may be permanently connected portions of a single integral body having an intermediate zone which is capable of flexing to permit relative movement of the two parts, e.g. a plastics membrane between mouleded parts, but in a preferred arrangement the two parts are discrete and are capable of engagement one with the other. By way of example, each of the parts may have, at a first location, respective interengageable coupling formations, and at a second location remote from the first location, a releasable locking means. The locking means may be a deformable snap catch or other means adapted to hold the parts in fully assembled condition. In a preferred construction the body parts having interengaging tenons at a first location, and a screw passed through one part and threaded into the other part, at a second location.
The parts advantageously provide for clamping of at least one flexible sheath entering the connector, e.g. the outer sheath of a single flexible conductor or of a multiple electrical conductor, in similar manner by resilient deformation of a resiliently compressible means as the two parts are brought into fully assembled condition.
The parts further advantageously provide for clamping of one or more other internal items, e.g.
a fuse, in good electrical contact with a terminal, and/or an internal conductor, in similar manner by resilient deformation of a resiliently compressible means as the two parts are brought into fully assembled condition. The resiliently compressible means may be individual to each of the items to be clamped, or there may be a single resiliently compressible element serving for all the clamping functions, or any sub-division thereof.
In a preferred arrangement, the terminal or terminals and any internal conductor provided., against which items are to be clamped, are positioned in or on one of the parts, and the resiliently compressible element or elements are positioned in or on the other of the parts, e.g. the first part may be a body portion of a connector, and the second part may be a cover therefor.
The contact surface of the terminal(s) and/or of any internal conductor provided is preferably toothed, serrated or otherwise formed for better biting engagement with the flexible conductor, and may be adapted to bite through any nonstripped sheathing of the conductor.
That part which carries the terminal(s) is advantageously provided with retaining means adapted to retain the flexible conductor in position over the contact surface whilst the two parts are being brought into fully assembled condition.
The two parts may be provided with interengageable tenon and recess means serving, when the two parts have been brought into fully assembled condition, to prevent entry of a thin bladed item between the two parts.
In a preferred practical embodiment, the invention is applied to a three-pin square-pin mains plug, the two parts being respectively the body and a cover of the plug. The body holds three loosely inserted pins having an enlarged head seated in a recess. Adjacent two of the pins there are provided ears to hold a respective wire positioned over a serrated top surface of the pin.
The body holds a terminal block with a ridged upper surface, and a third pair of ears is positioned to hold the third wire in position over it. A fourth pair of ears is positioned to hold a fuse with one end contacting the terminal block, and the other end contacting the ridged top of the third pin. The body and cover provide at least one cable entry, and a resilient block serves to clamp the cable sheath. Along one edge the body and the cover are interengaged by a lip and a rib, and near the opposite edge there is provided a screw engaged through the body and threaded into the cap. When the screw is fully tightened, the cap presses the wires and the fuse ends into good electrical connection, and also clamps the cable(s).
In order that the nature of the invention may be readily ascertained, an embodiment of electrical connector in accordance therewith is hereinafter particularly described with reference to the figures of the accompanying drawings, wherein:
Fig. 1 is an elevation of the connector in assembled condition;
Fig. 2 is a plan view with a cover removed;
Fig. 3 is a section of Fig. 2;
Fig. 4 shows two different elevations, and a plan view, of a pin;
Fig. 5 is a scrap section to show a wire retainer;
Fig. 6 is a scrap section to show a ridge and a groove of the body and cover which interengage to prevent insertion of any thin item between them;
Fig. 7 is a scrap section to show the manner of engagement of a bared wire and between a pin and a resilient pad.
The connector comprises a body 1 and a cover 2.
The body 1 has a lip 3, and the cover 2 has a rib 4 which can be engaged therewith to form a coupling at one end and which ensure that the body and cover remain parallel. Adjacent the other end there is provided a tapped hole 5 in the cover, and a smooth hole 5a in the body to receive a screw 6 for assembly purposes. The screw 6 could be replaced by snap fit parts of the body and cover, or a resilient catch element fitted in one or other part.
The body 1 has three holes 7 of rectangular section to receive with clearance a respective rectangular-section pin 8. Alternatively, pins could be permanantly located in the plastic matrix at the moulding stage. Referring-to Fig. 4 it will be seen that the pin has a rectangular body with a rectangular head 8a on the upper face of which is a series of ridges 8b. The pins would be of the usual lengths required for current-carrying, and for earthing.
Adjacent to each pin hole 7 there is provided a pair of ears 9 (see Fig. 5) which are resiliently bendable and/or which are spaced sufficiently to enable a wire lead 10 of the cable 11 to be squeezed in between the ears and held there, with the bared end 1 Oa held over the ridges 8b of the pin.
In the case of the live pin, seen on the righthand side in Fig. 2, the ridges 8b are contacted by the end cap 12 of a fuse 13, the other end cap 14 of the fuse overlying a ridged insert block 1 5 which is seated in a recess of the body 1. The pair of ears 9 for the live lead is positioned adjacent to the block 1 5. A somewhat larger pair of resilient
ears or guides 1 6 is provided to hold the fuse 13
in position.
The body 1 and the cover 2 have aligned
recesses to form entry holes 1 7 and 1 8 (see Fig.
1) for a large diameter cable 1 or for a smaller
cable 1 9.
Fig. 2 shows the entry path of large (11) and small (19) cables. In each case the gap between the moulded ridged surface and the resilient clamping pad is so arranged as to provide a
secure gripping action when the plug is
assembled together.
Exposed at the underface of the cover 2 there
is a resilient block 22 (see Fig. 7). A respective
block of this kind is positioned above each pin 8
and also above each of the fuse 13, or a single
block or insert layer may be dimensioned to be
situated above each such position, or in any
desired subdivision.
When the screw 6 is tightened, the resilient
block(s) bears on the wire ends and the fuse to
press them very firmly against the ridged upper ends of the pins 8, and in the case of the fuse also against the ridged block 1 5. Provision is also made to ensure that pressure on the "live" pin cannot crush the fuse against the lid.
Any slight differences in level, as between respective wires of a same cable, or of different cables, and diameter of the fuse ends, is taken up by the resilience of the block(s).
At the same time, the cable 11 is forced down onto its seating 20, or the cable 19 is held down onto its seating 21. Thus a single tightening action results in clamping of all of the conductive elements in good electrical connection, and also clamping of the cable itself.
Referring to Fig. 6, the cover 2 and the body 1 are provided respectively with a groove 23 and a ridge 24 (or vice versa) which, when the cover is properly in position, interengage to prevent a thin article such as a knife blade or the like being slipped between the two parts.
This construction of plug overcomes many disadvantages inherent in present constructions: 1. Some conventional plugs have brass pins that require at least two machining operations-in order to form holes for:
(a) the wire, and
(b) a grub screw
The grub screw also has to be manufactured and fitted onto the pin.
The connector of the present invention, as illustrated, has pins that do not require any machining, as the serrated top surface can easily be cast or extruded in one process.
2. Some conventional plugs are difficult to assemble because the stripped wire end has to be poked through a small hole, and a small screw has to be tightened to hold the wire in place.
With the connector shown, the stripped wires only have to be laid over the brass pin, and the wire is held in position by the guides. When the cover is screwed down, the wires are forced into a secure contact with each brass pin, and there are no grub screws to lose.
3. With many conventional plugs, the grub screws which clamp the wires can work loose if the plug is subject to vibration. This cannot happen with the construction shown.
4. Some conventional plugs have a fuse clip which can lose its shape, thus giving a bad contact, but with the construction shown the fuse is pressed firmly into place by an elastomer pad so no complex clip is required.
5. Some conventional plugs incorporate a bridge or winged cable clamp that is often not used when the plug is wired up by an inexperienced person, but the connector shown has an automatic cable clamp.
6. With the connector shown the contact area between the brass pin and the stripped wire is greatly increased, which is important when large currents are being carried.
Claims (Filed 5.3.82)
1. An electrical connector comprising a first
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (14)
1) for a large diameter cable 1 or for a smaller
cable 1 9.
Fig. 2 shows the entry path of large (11) and small (19) cables. In each case the gap between the moulded ridged surface and the resilient clamping pad is so arranged as to provide a
secure gripping action when the plug is
assembled together.
Exposed at the underface of the cover 2 there
is a resilient block 22 (see Fig. 7). A respective
block of this kind is positioned above each pin 8
and also above each of the fuse 13, or a single
block or insert layer may be dimensioned to be
situated above each such position, or in any
desired subdivision.
When the screw 6 is tightened, the resilient
block(s) bears on the wire ends and the fuse to
press them very firmly against the ridged upper ends of the pins 8, and in the case of the fuse also against the ridged block 1 5. Provision is also made to ensure that pressure on the "live" pin cannot crush the fuse against the lid.
Any slight differences in level, as between respective wires of a same cable, or of different cables, and diameter of the fuse ends, is taken up by the resilience of the block(s).
At the same time, the cable 11 is forced down onto its seating 20, or the cable 19 is held down onto its seating 21. Thus a single tightening action results in clamping of all of the conductive elements in good electrical connection, and also clamping of the cable itself.
Referring to Fig. 6, the cover 2 and the body 1 are provided respectively with a groove 23 and a ridge 24 (or vice versa) which, when the cover is properly in position, interengage to prevent a thin article such as a knife blade or the like being slipped between the two parts.
This construction of plug overcomes many disadvantages inherent in present constructions: 1. Some conventional plugs have brass pins that require at least two machining operations-in order to form holes for:
(a) the wire, and
(b) a grub screw
The grub screw also has to be manufactured and fitted onto the pin.
The connector of the present invention, as illustrated, has pins that do not require any machining, as the serrated top surface can easily be cast or extruded in one process.
2. Some conventional plugs are difficult to assemble because the stripped wire end has to be poked through a small hole, and a small screw has to be tightened to hold the wire in place.
With the connector shown, the stripped wires only have to be laid over the brass pin, and the wire is held in position by the guides. When the cover is screwed down, the wires are forced into a secure contact with each brass pin, and there are no grub screws to lose.
3. With many conventional plugs, the grub screws which clamp the wires can work loose if the plug is subject to vibration. This cannot happen with the construction shown.
4. Some conventional plugs have a fuse clip which can lose its shape, thus giving a bad contact, but with the construction shown the fuse is pressed firmly into place by an elastomer pad so no complex clip is required.
5. Some conventional plugs incorporate a bridge or winged cable clamp that is often not used when the plug is wired up by an inexperienced person, but the connector shown has an automatic cable clamp.
6. With the connector shown the contact area between the brass pin and the stripped wire is greatly increased, which is important when large currents are being carried.
Claims (Filed 5.3.82)
1. An electrical connector comprising a first
body part and a second body part which are relatively movable into abutment for assembly, a terminal carried by one of the body parts and having a contact surface exposed towards the other body part when the body parts are assembled, and resiliently-compressible connector clamping means disposed between the terminal and at least one of said body parts, such that with a flexible electrical connector seated on said contact surface movement of the two body parts into abutment causes the flexible connector to be pressed onto the contact surface as a result of resilient deformation of the resiliently compressible means.
2. An electrical connector, as claimed in claim 1, wherein the resiliently compressible means is a member seated in or secured on a body part made of rigid materiai.
3. An electrical connector, as claimed in either of claims 1 and 2, wherein the two body parts are permanently connected by an integral intermediate zone which is capable of flexing to permit relative movement of the two body parts.
4. An electrical connector, as claimed in either of claims 1 and 2, wherein the two body parts are discrete and are provided with means for releasable interengagement with each other.
5. An electrical connector, as claimed in claim 4, wherein each of the body parts has at a first location a respective one of two inter-engageable coupling formations, and at a second.location a respective part of a releasable locking means.
6. An electrical connector, as claimed in claim 5, wherein the locking means is a deformable snap catch on one body part engageable with the other body part.
7. An electrical connector, as claimed in claim 5, wherein the locking means is a headed screw engaged through one body part and threaded into the other body part.
8. An electrical connector, as claimed in any preceding claim, wherein each body part has a respective one of a pair of opposed cable clamping surfaces, and wherein resilientlycompressible cable-clamping means are disposed on one or both of said cable-ciamping surfaces, such that with a cable situated between said surfaces movement of the two body parts into abutment causes the cable to be clamped as a result of resilient deformation of said cableclamping means.
9. An electrical connector, as claimed in any preceding claim, wherein one body part carries an electrical conductor and the other body part has a component-clamping surface, and wherein resiliently-compressible component-clamping means are disposed between said one body part and the conductor and/or on said componentclamping surface, such that with a component seated on said conductor movement of the two body parts into abutment causes the component to be pressed onto the conductor as a result of resilient deformation of the component-clamping means.
1 0. An electrical connector, as claimed in claim 9 when made dependent upon claim 8, wherein the resiliently-compressible means acting respectively on the electrical connector, and on the cable, and on the component, are all portions of a single clamping member.
11. An electrical connector, as claimed in any one of the preceding claims, wherein the terminal, and the conductor where provided, are toothed or serrated for better gripping of an item pressed into contact therewith.
1 2. An electrical connector, as claimed in any one of the preceding claims, wherein the terminal is provided with an edge formation adapted to penetrate insulation of an electrical connector.
13. An electrical connector, as claimed in any one of the preceding claims, wherein that body part which carries the terminal, and the electrical conductor where provided, comprises retaining means for retaining the connector or the component, as the case may be, in position prior to assembly of the two body parts.
14. An electrical connector, as claimed in claim 13, wherein said retaining means are spaced resilient ears projecting from the body part.
1 5. An electrical connector, as claimed in any one of the preceding claims, wherein the two body parts are provided each with a respective one of tenon and recess means which interengage, when the body parts are fully assembled, in-such a manner as to prevent insertion of a thin tool, between the body parts, beyond the tenon means.
1 6. An electrical connector substantially as described herein with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8108025A GB2095047A (en) | 1981-03-13 | 1981-03-13 | Electrical connections |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8108025A GB2095047A (en) | 1981-03-13 | 1981-03-13 | Electrical connections |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2095047A true GB2095047A (en) | 1982-09-22 |
Family
ID=10520376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8108025A Withdrawn GB2095047A (en) | 1981-03-13 | 1981-03-13 | Electrical connections |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2095047A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3530721A1 (en) * | 1985-08-28 | 1987-03-05 | Kolbe & Co Hans | ANTENNA SOCKET |
| EP0605426A1 (en) * | 1991-09-27 | 1994-07-13 | Raychem Corporation | Telecommunications terminal block and terminal therefor |
| GB2282494A (en) * | 1993-09-22 | 1995-04-05 | Nifco Inc | Plug for electric wire |
| WO2000048274A1 (en) * | 1999-02-10 | 2000-08-17 | Bok Siah Lim | Improved electric plug |
-
1981
- 1981-03-13 GB GB8108025A patent/GB2095047A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3530721A1 (en) * | 1985-08-28 | 1987-03-05 | Kolbe & Co Hans | ANTENNA SOCKET |
| WO1987001519A1 (en) * | 1985-08-28 | 1987-03-12 | Hans Kolbe & Co. | Aerial plug socket |
| EP0605426A1 (en) * | 1991-09-27 | 1994-07-13 | Raychem Corporation | Telecommunications terminal block and terminal therefor |
| EP0605426A4 (en) * | 1991-09-27 | 1996-05-15 | Raychem Corp | Telecommunications terminal block and terminal therefor. |
| GB2282494A (en) * | 1993-09-22 | 1995-04-05 | Nifco Inc | Plug for electric wire |
| WO2000048274A1 (en) * | 1999-02-10 | 2000-08-17 | Bok Siah Lim | Improved electric plug |
| SG106034A1 (en) * | 1999-02-10 | 2004-09-30 | Bok Siah Lim | Improved electric plug |
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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) |