GB2064886A - Sleeved plug-pins - Google Patents
Sleeved plug-pins Download PDFInfo
- Publication number
- GB2064886A GB2064886A GB8023663A GB8023663A GB2064886A GB 2064886 A GB2064886 A GB 2064886A GB 8023663 A GB8023663 A GB 8023663A GB 8023663 A GB8023663 A GB 8023663A GB 2064886 A GB2064886 A GB 2064886A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pin
- length
- sleeve
- plug
- slit
- 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
Links
- 239000004033 plastic Substances 0.000 claims abstract description 17
- 229920003023 plastic Polymers 0.000 claims abstract description 17
- 239000011810 insulating material Substances 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000003000 extruded plastic Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000002788 crimping Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
-
- 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
- H01R13/02—Contact members
- H01R13/04—Pins or blades for co-operation with sockets
- H01R13/05—Resilient pins or blades
- H01R13/055—Resilient pins or blades co-operating with sockets having a rectangular transverse section
Landscapes
- Connector Housings Or Holding Contact Members (AREA)
Abstract
A pin (3) of an electric plug has, over a substantial part (6) of its length which may be of reduced cross-section, a separate preformed sleeve (5) of plastics insulating material which is slit through its length and which fits onto and surrounds that part (6) of the pin, each edge of the slit of the preformed sleeve (5) having, extending along its length, a shoulder (9, Figure 3, not shown) which engages a corresponding longitudinally extending shoulder (10) on said part of the length of the pin. The pin may be of the type used in domestic plugs and may be formed by folding a sheet metal preform. <IMAGE>
Description
SPECIFICATION
Improvements in or relating to electric plugs
This invention relates to electric plugs and is especially, but not exclusively, concerned with electric plugs for use in domestic and similar wiring systems.
When an electric plug is electrically connected in a socket outlet but the faces of the plug and outlet are not in interfacial engagement, there is a substantial risk that a child or other person will introduce a finger or other object between these faces and receive an electric shock. To reduce this risk, it has been proposed and is sometimes the practice to provide on at least each line pin of the plug an insulating protective covering which extends around and along a substantial part of the length of the pin projecting from and adjacent to the insulating plug body.Such insulating protective pin coverings may be integral parts of the plug body but more recently it has been proposed to use, for each insulating pin-covering, a separate sleeve of insulating material which fits over a part of a length of a pin or a separate body of insulating material which is moulded in situ on a part of a length of a pin, each of which parts is of reduced cross-section.
According to the present invention, we provide an electric plug having an insulating plug body from which at least two pins project, wherein each line pin has, over a substantial part of its length adjacent the plug body, a separate preformed sleeve of plastics insulating material which is slit throughout its length and which fits onto and surround said part of the pin, at least one, and preferably each, edge of the slit of the preformed sleeve having, extending along its length, a shoulder which engages a corresponding longitudinally extending shoulder on said part of the length of the pin. Preferably the slit of the sleeve extends substantially parallel to the longitudinal axis of the sleeve.
Each line pin may be of solid form, but preferably each line pin is of hollow cross-section and is formed by folding or otherwise shaping a sheet metal preform.
Preferably the electric plug comprises an insulating plug body from which at least two pins project, wherein each line pin is of hollow cross-section and is formed by transversely folding a sheet metal preform and wherein each line pin has over a substantial part of its length adjacent the plug body, a separate preformed sleeve of plastics insulating material which is slit throughout its length and which fits onto and surrounds said part of the pin, the longitudinally extending edges of said part of each pin being spaced apart and shoulders extending along the edges of the slit of the preformed sleeve fitting in the gap between and engaging shoulders constituted by the longitudinally extending edges of said part of the line pin.In this case, each shoulder on the preformed sleeve has a longitudinally extending groove in which fits the shoulder constituted by one longitudinally extending edge of said part of the line pin.
In all cases the sleeve is preferably made of resilient plastics material so that it clips onto and grips said part of the pin.
Preferably, also, said part of the length of each line pin is of reduced overall cross-section and extends to that part of the pin within the plug body and the preformed slit sleee is so shaped and dimensioned externally that its outer surface forms a substantially smooth continuation of the surface of the unreduced part of the length of the pin. Preferably, in this case, where the sleeve is made of resilient plastics material, the sleeve may be fitted onto the pin by pulling the slit edges apart, positioning the sleeve around the pin, and then allowing the edges to spring back so that the sleeve snap-fits within the reduced cross-section part of the pin with the slit edges abutting.
The transverse configuration of each line pin may be rectangular, circular or any other desired transverse cross-sectional shape, and when said part of each line pin surrounded by the preformed plastics sleeve is of reduced cross-section, the transverse configuration of said reduced part may be of the same transverse cross-sectional shape as that of the pin or may have a transverse cross-sectional shape differing from that of the pin.
The invention also includes, for providing a covering of insulation over a substantial part of the length of a line pin of an electric plug as hereinbefore described, a preformed sleeve of plastics insulating material having a slit extending throughout its length, at least one edge of the slit having extending along its length, a shoulder for engaging a corresponding longitudinally extending shoulder on said part of the length of the pin.
The preformed sleeve may be made by any convenient method, but preferably it is made either as a discrete moulding or by continuous extrusion, the required length of preformed sleeve being cut from the extruded plastics material.
The invention further includes, for use in an electric plug as hereinbefore described, a plug pin having a substantial part of its length covered by a preformed sleeve as herein before described.
The invention is further illustrated by a description, by way of example, with reference to the accompanying drawings, in which:
Figure lisa pictorial view of an electric plug in accordance with the invention;
Figure 2 is an isometric view of a line pin of the electric plug shown in Figure 1; and
Figure 3 is an isometric view of a preformed sleeve of the pin shown in Figure 2.
Referring to Figure 1, the electric plug 1 comprises an insulating body 2 from one face of which project line pins 3 and an earth pin 4. Each line pin 3 has, over a substantial part of its length adjacent the plug body 2, a preformed sleeve 5 of resilient plastics insulating material which is slit throughout its length and which has been fitted onto and surrounds said part of the pin.
Referring to Figures 2 and 3 each line pin 3 is of hollow cross-section and is formed by transversely folding a sheet metal preform. The pin 3 has a part 6 of reduced thickness, and longitudinally extending edges 10 of said part of the pin being spaced apart.
The edges 7 of the slit 8 in the preformed sleeve 5
have shoulders 9 which fit behind shoulders constituted by the edges 10 on the pin 3 to secure the
preformed sleeve to the pin. The preformed sleeve 5
is snap-fitted to the pin 3 after the pin preform has
been folded.
An electric conductor is electrically connected to the pin 3 by crimping. Fingers 11 are cut and formed as integral extensions of the pin 3 when the pin is cut and folded. These fingers 11 can be folded around a conductor to make a crimped connection.
Claims (26)
1. An electric plug having an insulating plug
body from which at least two pins project, wherein each line pin has over a substantial part of its length adjacent the plug body, a separate preformed sleeve of plastics insulating material which is slit throughout its length and which fits onto and surrounds said part of the pin, at least one edge of the slit of the preformed sleeve having, extending along its length, a shoulder which engages a corresponding longidutinally extending shoulder on said part of the length of the pin.
2. An electric plug as claimed in Claim 1,wherein each edge of the slit of the preformed sleeve, has extending along its length, a shoulder which engages a corresponding longitudinally extending shoulder on said part of the length of the pin.
3. An electric plug as claimed in Claim 1 or Claim 2, wherein the slit of the sleeve extends substantially parallel to the longitudinal axis of the sleeve.
4. An electric plug as claimed in any one of the preceding Claims, wherein each pin is of hollow cross-section and is formed byfolding or otherwise shaping a sheet metal preform.
5. An electric plug having an insulating plug body from which at least two pins project, wherein each line pin is of hollow cross-section and is formed by transversely folding a sheet metal preform and wherein each line pin has, over a substantial part of its length adjacent the plug body, a separate preformed sleeve of plastics insulating material which is slit throughout its length and which fits onto and surrounds said part of the pin, the longitudinally extending edges of said part of each pin being spaced apart and shoulders extending along the edges of the slit of the preformed sleeve fitting in the gap between and engaging shoulders constituted by the longitudinally extending edges of said part of the line pin.
6. An electric plug as claimed in Claim 5, wherein each shoulder on the preformed sleeve has a longitudinally extending groove in which fits the shoulder constituted by one longitudinally extending edge of said part of the line pin.
7. An electric plug as claimed in any one of the preceding Claims, wherein the sleeve is made of resilient plastics material.
8. An electric plug as claimed in any one of the preceding Claims, wherein said part of the length of each line pin is of reduced overall cross-section and extends to that part of the pin within the plug body and the preformed slit sleeve is so shaped and dimensioned externally that its outer surface forms a substantially smooth continuation of the surface of the unreduced part of the length of the pin.
9. An electric plug as claimed in Claim 8 in which the sleeve is made of resilient plastics material, wherein the slit sleeve is a snap-fit on the part of the pin having a reduced overall cross-section with the edges of the slit abutting.
10. An electric plug as claimed in any one of the preceding Claims, wherein the transverse configuration of each pin has a rectangular cross-sectional shape.
11. An electric plug as claimed in Claim 10 in which said part of the length of each line pin is of reduced cross-section, wherein the transverse configuration of said reduced part has a rectangular cross-sectional shape.
12. A preformed sleeve of plastics insulating material for providing a covering of insulation over a substantial part of the length of a line pin of an electric plug as claimed in any one of the preceding
Claims, which sleeve has a slit extending throughout its length, at least one edge of the slit having, extending along its length, a shoulder for engaging a corresponding longitudinally extending shoulder on said part of the length of the pin.
13. A preformed sleeve as claimed in Claim 12, wherein said sleeve is made as a discrete moulding.
14. A preformed sleeve as claimed in Claim 12, wherein said sleeve is made by continuous extrusion, the required length of sleeve being cut from the extruded plastics material.
15. For use in an electric plug, a plug pin having over a substantial part of its length that will be adjacent the plug body, a separate preformed sleeve of plastics insulating material which is slit th roughout its length and which fits onto and surrounds said part of the pin, at least one edge of the slit having, extending along its length, a shoulderforengaging a corresponding longitudinally extending shoulder on said part of the length of the pin.
16. A plug pin as claimed Claim 15, wherein each edge of the slit of the preformed sleeve has, extending along its length, a shoulder which engages a corresponding longitudinally extending shoulder on said part of the length of the pin.
17. A plug pin as claimed in Claim 15 or Claim 16, wherein the slit of the sleeve extends substantially parallel to the longitudinal axis of the sleeve.
18. A plug pin as claimed in any one of Claims 15 to 17, wherein the pin is of hollow cross-section and is formed by folding or otherwise sheet metal preform.
19. A plug pin which is of hollow cross-section and which is formed by transversely folding a sheet metal preform having, over a substantial part of its length that will be adjacent the plug body, a separate preformed sleeve of plastics insulating material which is slit throughout its length and which fits onto and surrounds said part of the pin, the longitudinally extending edges of said part of the pin being spaced apart and shoulders extending along the edges of the slit of the preformed sleeve fitting in the gap between and engaging shoulders constituted by the longitudinally extending edges of said part of the pin.
20. A plug pin as claimed in Claim 19, wherein each shoulder on the preformed sleeve has a longitudinally extending groove in which fits the shoulder constituted by one longitudinally extending edge of said part of the pin.
21. A plug pin as claimed in any one of Claims 15 to 20, wherein the sleeve is made of resilient plastics material.
22. A plug pin as claimed in any one of Claims 15 to 21, wherein said part of the length of each line pin is of reduced overall cross-section and extends to that part of the pin which will be within the plug and the preformed sleeve is so shaped and dimensioned externally that its outer surface forms a substantially smooth continuation of the surface of the unreduced part of the length of the pin.
23. A plug pin as claimed in Claim 22 in which the sleeve is made of resilient plastics material, wherein the slit sleeve is a snap-fit on the part of the pin having reduced overall-section with the edges of the slit abutting.
24. An electric plug substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
25. A plug pin substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.
26. A preformed sleeve substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8023663A GB2064886B (en) | 1979-07-19 | 1980-07-18 | Sleeved plug-pins |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7925206 | 1979-07-19 | ||
| GB8023663A GB2064886B (en) | 1979-07-19 | 1980-07-18 | Sleeved plug-pins |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2064886A true GB2064886A (en) | 1981-06-17 |
| GB2064886B GB2064886B (en) | 1983-02-16 |
Family
ID=26272245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8023663A Expired GB2064886B (en) | 1979-07-19 | 1980-07-18 | Sleeved plug-pins |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2064886B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2291280A (en) * | 1994-07-07 | 1996-01-17 | Jo Jo A S | A plug |
| AU692746B3 (en) * | 1997-10-09 | 1998-06-11 | Tyco Electronics Pty Limited | Electrical connector |
| GB2337875A (en) * | 1998-03-05 | 1999-12-01 | Utilux Pty Ltd | Plug pin with insulated portion folded from a sheet |
-
1980
- 1980-07-18 GB GB8023663A patent/GB2064886B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2291280A (en) * | 1994-07-07 | 1996-01-17 | Jo Jo A S | A plug |
| GB2291280B (en) * | 1994-07-07 | 1997-04-23 | Jo Jo A S | A plug |
| AU692746B3 (en) * | 1997-10-09 | 1998-06-11 | Tyco Electronics Pty Limited | Electrical connector |
| AU736023B2 (en) * | 1997-10-09 | 2001-07-26 | Tyco Electronics Pty Limited | Electrical connector |
| GB2337875A (en) * | 1998-03-05 | 1999-12-01 | Utilux Pty Ltd | Plug pin with insulated portion folded from a sheet |
| GB2337875B (en) * | 1998-03-05 | 2002-04-03 | Utilux Pty Ltd | Improved electrical connector |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2064886B (en) | 1983-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |