GB2082852A - Electric plug with sleeved pins - Google Patents
Electric plug with sleeved pins Download PDFInfo
- Publication number
- GB2082852A GB2082852A GB8126044A GB8126044A GB2082852A GB 2082852 A GB2082852 A GB 2082852A GB 8126044 A GB8126044 A GB 8126044A GB 8126044 A GB8126044 A GB 8126044A GB 2082852 A GB2082852 A GB 2082852A
- Authority
- GB
- United Kingdom
- Prior art keywords
- length
- pin
- sleeve
- plug
- electric 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
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
- H01R13/44—Means for preventing access to live contacts
Landscapes
- Connector Housings Or Holding Contact Members (AREA)
Abstract
An insulating sleeve 7 for a pin 5 of an electric plug is slit throughout its length at at least one position, and preferably at two spaced positions around its periphery, and marginal portions 8 of the sleeve bounding the or each slit are each so shaped that one makes a snap-fit with the other. Preferably, each marginal portion 8 is of such reduced thickness that one overlies the other, one of the abutting surfaces of the marginal portions having a rib 10 that is a snap-fit in a groove 9 in the other of the abutting surfaces. <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.
When an electric plug is electrically connected in a socket outlet but the faces of the plug and outlet do not abut, there is a substantial risk that a chiid 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 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 the length of a pin, this part of the pin being of reduced overall crosssection as compared with the remaining part of the length of the pin, which sleeve is of such thickness that its outer surface forms a substantially smooth continuation of the surface of the unreduced part of the length of the pin.
According to the present invention, we provide an improved electric plug comprising an insulating plug body from which project at least two line pins, each of which pins is of solid form and is, over a substantial part of its length adjacent the plug body, of reduced overall cross-section as compared to the remaining part of the length of the pin, and surrounding said reduced part of the length of each pin, a separate preformed sleeve which is made of plastics insulting material and which is of such a wall thickness that its outer surface forms a substantially smooth continuation of the surface of the unreduced part of the length of the pin, wherein each preformed sleeve is slit throughout its length at at least one portion around its periphery and marginal portions of the sleeve bounding the or each slit are each so shaped that one of said marginal portions makes a snap fit with the other.
Preferably, each preformed sleeve is slit throughout its length at two positions spaced around its periphery to form two separately formed sleeve components and marginal portions of the sleeve components bounding each slit are each so shaped that one of said marginal portions makes a snap fit with the other.
Preferably, also, the or each slit of each sleeve extends substantially parallel to the longitudinal axis of the sleeve.
The marginal portions of each sleeve or of the sleeve components bounding the or each slit may take any convenient form, provided that the one effects a snap fit with the other and the outer surface of the sleeve is a substantially smooth continuation of the surface of the unreduced part of the pin, but, preferably, each marginal portion of the or each pair of interengaging marginal portions is of such reduced thickness that one marginal portion of said pair overlies the other marginal portion and at least one of the abutting surfaces of said marginal portions has a longitudinally extending rib that is a snap fit in a longitudinally extending groove in the other of said abutting surfaces.
In all cases, each preformed sleeve is preferably made of resilient plastics material so that it fits on to and grips the reduced part of the pin when the marginal portions of the sleeve or of the sleeve components are in snap fit engagement.
The transverse configuration of each line pin is preferably rectangular but it may be circular or any other desired transverse cross-sectional shape.
The transverse configuration of the reduced part of the pin may be of the same transverse crosssectional shape as that of the unreduced part of the pin or it may have a transverse cross-sectional shape differing from that of the unreduced part of the pin.
The electric plug of the present invention may be a rewirable plug or a non-rewirable plug. In the latter case it may be the plug of an electric plug assembly of the kind in which the plug pins protrude through holes in, and associated conductor terminals are mounted on, a preformed body of electrically insulating material. the conductors of a length of insulated multiconductor cable are electrically connected to appropriate terminals of the plug, and a moulded plug body of electrically insulating material wholly or partially encapsulates the preformed body and the plug pins and associated conductor terminals with an appropriate length of each pin protruding from the plug assembly and is permanently bonded to the insulated covering of a part of a length of flexible insulated multi-conductor cable, or it may be the plug of an electric plug assembly of the kind in which the plug pins protrude through holes in one of two preformed shells of electrically insulating material, which shells are welded or otherwise permanently secured together to form an insulating plug body housing the permanent
electrical connections between the plug pins and
the electric conductors of a length of flexible
insulated multi-conductor cable.
The invention also includes, for providing a covering of insulation over a substantial part of the length of a solid line pin of an electric plug, which part is of reduced overall cross-section as compared with the remainder of the length of the pin, a preformed sleeve of plastics insulating material having at least one slit extending throughout its length, marginal portions of the sleeve bonding the or each slit being so shaped that one of said marginal portions will make a snap fit with the other to form a sleeve of substantially constant wall thickness throughout its periphery.
Preferably, the preformed sleeve is divided longitudinally of its length into two separately formed sleeve components, the sleeve components having two pairs of abutting marginal portions, so shaped that one of each pair of abutting marginal portions will make a snap fit with the other of said pair to form a sleeve of substantially constant wall thickness throughout
its periphery.
The invention further includes, for use in an
electric plug, a solid plug pin having a substantial
part of its length of reduced cross-section and
covered by a preformed insulating sleeve as
hereinbefore described.
The invention is further illustrated by a
description, by way of example, of a preformed
1 3A electric plug assembly with reference to the
accompanying drawings, in which: Figure 1 is a perspective view of the plug ofthe 1 3A electric plug assembly;
Figure 2 is a transverse cross-sectional view of
one of the line pins of the plug shown in Figure 1;
Figure 3 is a transverse cross-sectional view of
an alternative form of line pin for use in the plug
shown in Figure 1; and
Figure 4 is a transverse cross-sectional view of
a line pin of circular cross-section for use in an
electric plug.
Referring to Figures 1 and 2, in the plug of the
1 3A electric plug assembly, the line pins 1 and
earth pin 2 protrude through holes in, and
associated terminals (not shown) are mounted on,
a preformed base insert 3 of electrically insulating
material, the conductors of a length of insulated
multi-conductor cable (not shown) being
electrically connected to appropriate terminals of
the plug. A moulded plug body 4 of electrically
insulating material partially encapsulates the
preformed base insert 3, the plug pins 1 and 2 and
associated conductor terminals with an
appropriate length of each pin protruding from the
plug assembly and is permanently bonded to the
insulating covering of a part of a length of the
cable.Over approximately half of its length
adjacent the preformed base insert 3, each line pin
1 is of reduced overall cross-section as compared
to the remaining part of the length of the pin and
the reduced part 5 of the pin is surrounded by a
preformed sleeve 6 of resilient plastics material
which is divided longitudinally of its length into
two separately formed sleeve components 7. The
sleeve components 7 have two pairs of abutting
marginal portions 8 so shaped that one of each
pair of abutting marginal portions overlies the
other marginal portion of the pair and each of the
abutting surfaces of these marginal portions has a
longitudinally extending rib 10 that is a snap fit in
a longitudinally extending groove 9 in the order of
these abutting surfaces.
The alternative form of line pin 11 shown in
Figure 3 is also of reduced overall cross-section over approximately half of its length as compared to the remaining part of the length of the pin and carries, on the reduced part 1 5 of the pin, a preformed sleeve 1 6 of resilient plastics material which is slit throughout its length and marginal portions of the sleeve bounding the slit are each so shaped that one of the marginal portions overlies and makes a snap fit with the other marginal portion of the pair.
Figure 4 shows a transverse cross-section view, of a line pin 21 of circular cross-section which is of reduced cross-sectional area over approximately half of its length as compared to the remainder of the length of the pin and which carries, over the reduced part 25 of the length of the pin, a sleeve 26 of resilient plastics material divided longitudinally along its length into two separately formed sleeve components, the sleeve components having two pairs of abutting marginal portions so shaped that one of each pair of abutting marginal portions overlies and makes a snap fit with the other of said pair.
Claims (15)
1. An electric plug comprising an insulating plug body from which project at least two line pins, each of which pins is of solid form and is, over a substantial part of its length adjacent the plug body, of reduced overall cross-section as compared to the remaining part of the length of the pin, and surrounding said reduced part of the length of each pin, a separate preformed sleeve which is made of plastics insulating material and which is of such a wall thickness that its outer surface forms a substantially smooth continuation of the surface of the unreduced part of the length of the pin, wherein each preformed sleeve is slit throughout its length at at least one position around its periphery and marginal portions of the sleeve bounding the or each slit are each so shaped that one of said marginal portions makes a snap-fit with the other.
2. An electric plug comprising an insulating plug body from which project at least two line pins, each of which pins is of solid form and is, over a substantial part of its length adjacent the plug body, of reduced overall cross-section as compared to the remaining part of the length of the pin, and surrounding said reduced part of the length of each pin, a separate preformed sleeve which is made of plastics insulating material and which is of such a wall thickness that its outer surface forms a substantially smooth continuation of the surface of the unreduced part of the length of the pin, wherein each preformed sleeve is slit throughout its length at two positions spaced around its periphery to form two separately formed sleeve components and marginal portions of the sleeve components bounding each slit are each so shaped that one of said marginal portions makes a snap fit with the other.
3. An electric plug as claimed in Claim 1 or 2 wherein the or each slit of each 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 marginal portion of the or each pair of interengaging marginal portions of each sleeve is of such reduced thickness that one marginal portion of said pair overlies the other marginal portion and at least one of the abutting surfaces of said marginal portions has a longitudinally extending rib that is a snap fit in a longitudinally extending groove in the other of said abutting surfaces.
5. An electric plug as claimed in any one of the preceding Claims, wherein each preformed sleeve is made of resilient plastics material.
6. An electric plug as claimed in any one of the preceding Claims, wherein the transverse configuration of each line pin is rectangular.
7. An electric plug as claimed in any one of the preceding Claims, wherein the transverse configuration of the reduced part of each line pin has a transverse cross-sectional shape differing from that of the unreduced part of the pin.
8. An electric plug as claimed in any one of the preceding Claims, wherein the plug pins protrude through holes in a preformed body of electrically insulating material, 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 and is permanently bonded to the insulating covering of an adjacent part of a length of flexible insulated multi-conductor cable.
9. An electric plug as claimed in any one of
Claims 1 to 7, wherein the plug pins protrude through holes in one of two preformed shells of electrically insulating material, which shells are welded or otherwise permanently secured together to form the insulating plug body housing the permanent electrical connections between the plug pins and the electrical conductors of a flexible insulated multi-conductor cable.
10. For providing a covering of insulation over a substantial part of the length of a solid line pin of an electric plug, which part is of reduced crosssection as compared with the remainder of the length of the pin, a preformed sleeve of plastics insulating material having at least one slit extending throughout its length, marginal portions of the sleeve bounding the or each slit each being so shaped that one of said marginal portions will make a snap fit with the other to form a sleeve of substantially constant wall thickness throughout its periphery.
11. For providing a covering of insulation over a substantial part of the length of a solid line pin of an electric plug, which part is of reduced overall cross-section as compared with the remainder of the length of the pin, a preformed sleeve of plastics insulating material which is divided longitudinally of its length into two separately formed sleeve components, the sleeve components having two pairs of abutting marginal portions so shaped that one of each pair of abutting marginal portions will make a snap fit with the other of said pair to form a sleeve of substantially constant wall thickness throughout its periphery.
12. For use in an electric plug, a solid plug pin having a substantial part of its length of reduced cross-section as compared with the remainder of the length of the cables, wherein said reduced part of the pin is covered by a preformed insulating sleeve as claimed in Claim 10 or 11.
13. An electric plug comprising an insulating plug body from which project at least two line pins, wherein each line pin is substantially as hereinbefore described with reference to and as shown in Figures 1 and 2 of the accompanying drawings.
14. An electric plug comprising an insulating plug body from which project at least two line pins, wherein each line pin is substantially as hereinbefore described with reference to and as shown in Figure 3 of the accompanying drawings.
15. An electric plug comprising an insulating plug body from which project at least two line pins, wherein each line pin is substantially as hereinbefore described with reference to and as shown in Figure 4 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8126044A GB2082852B (en) | 1980-08-27 | 1981-08-26 | Electric plug with sleeved pins |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8027684 | 1980-08-27 | ||
| GB8126044A GB2082852B (en) | 1980-08-27 | 1981-08-26 | Electric plug with sleeved pins |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2082852A true GB2082852A (en) | 1982-03-10 |
| GB2082852B GB2082852B (en) | 1984-08-08 |
Family
ID=26276698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8126044A Expired GB2082852B (en) | 1980-08-27 | 1981-08-26 | Electric plug with sleeved pins |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2082852B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4815636A (en) * | 1983-06-03 | 1989-03-28 | Usm Corporation | Hot melt gun |
| GB2291280A (en) * | 1994-07-07 | 1996-01-17 | Jo Jo A S | A plug |
-
1981
- 1981-08-26 GB GB8126044A patent/GB2082852B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4815636A (en) * | 1983-06-03 | 1989-03-28 | Usm Corporation | Hot melt gun |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2082852B (en) | 1984-08-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |