GB2282713A - Non-rewireable plug - Google Patents
Non-rewireable plug Download PDFInfo
- Publication number
- GB2282713A GB2282713A GB9418670A GB9418670A GB2282713A GB 2282713 A GB2282713 A GB 2282713A GB 9418670 A GB9418670 A GB 9418670A GB 9418670 A GB9418670 A GB 9418670A GB 2282713 A GB2282713 A GB 2282713A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plug base
- fuse
- plug
- pin
- live
- 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
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Classifications
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- 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
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- 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
- H01R24/76—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure with sockets, clips or analogous contacts and secured to apparatus or structure, e.g. to a wall
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- 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
- H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
- H01R13/582—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable the cable being clamped between assembled parts of the housing
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- 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
- H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
- H01R13/5845—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable the strain relief being achieved by molding parts around cable and connections
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- 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
Landscapes
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
A live pin (5) a neutral pin (6) and, optionally, an earth pin (7) extend from an outer surface of a plug base (3), and a fuse box (8) is defined by a recess formed in the outer surface of the plug base (3). Terminals (5a) and (6a) of the pins (5) and (6) project on an inner surface of the plug base (3). Legs (27a) and (27b) of fuse clips (27) and (28) extend inside the fuse box (8). One fuse clip (27) has a holding portion (31) which may be crimped to a live conductor (34) of a cable core and the other clip (28) engages the terminal (5a) of the live pin (5). A terminal of a neutral conductor (23) of the cord may be riveted onto the terminal (6a) of the neutral pin (6) and a flange (35) of clip (28) may be riveted onto the terminal (5a) of the live pin (5). A cover (4) is placed over the plug base (3) to house the terminals (5a), (6a) and (7a) and other elements on the inner surface of the plug base (3). The cover (4) is fused to the plug base (3) entirely or partly. Connections may be made by rivetting, crimping or welding. Strain relief is provided by a bushing on the cable 2. <IMAGE>
Description
POWER SUPPLY PLUGS
The present invention generally relates power supply plugs, and more particularly to an improved non-rewirable electric plug attachable, for example, to domestic-use electrical equipments and insertable into a socket. - In England and other countries, generally an electric plug attached to a domestic-use electric equipment has a threc - pole structure having an earth terminal for the sake of safety.
Typically, this type of electric plug includes a piu,r base having three pins (an earth pin, a neutral pin and a liv pin) thereon. The plug base also has a pair of fuse clip' thereon. In case of three-pole structure. conventionally three conductors (an earth conductor, a neutral conductor and a live conductor) of the cord are connected with the earth ;)in, t}t) neutral pin and the live pin respectively in the lolloxvirlr manner: ring terminals are crimped at tips of the threE conductors of the cord respectively (this makes three crimpings)
Then, a pair of fuse clips are mounted on a plug base. Figure 1 of the accompanying drawings shows one such fuse clip 90b riveted on a plug base (not shown) with a special rivet 90a (this requires one riveting for each fuse clip). After that, 1 connection plate or link strap 90c connecting the fuse clip 901) with a live pin (not shown) is riveted on the plug base (two rivetings). Further, terminals of the earth pin, the neutral pin and the live pin are riveted to the ring terminals of the three conductors of the cord, respectively (three rivetings).
However, the conventional plug has the following disadvantages: the number of the rivetings for the connection is large (ten in the above-described typical example). Thus, a manufacturing cost for the plug is raised and reliability o.
electrical connection is low.
An object of the present invention is to provide an electric plug which eliminates the problems of the conventional plugs and which is inexpensive and lightweight.
According to one aspect of the present invention, there is provided an electric plug to be connected with a cord having a live conductor, a neutral conductor and an earth conductor, comprising: a plate-like plug base integrally having a live pirt, a neutral pin and an earth pin, the live, neutral and earth pins standing on an outside surface of the plug base respectively and having terminals projecting from an inside surface of the plug base respectively; a fuse box integrally molded to the inside surface of the plug base, the fuse box having a first pair ot slit-like openings in its bottom for receiving a pair of holding portions of a first fuse clip and a second pair of slit-like openings in its bottom for receiving a pair of holding portions of a second fuse clip, the first and second fuse clips being attached onto the bottom of the fuse box from the inside surface of the plug base respectively, the first fuse clip having a portion for crimping the live conductor of the cord, the second fuse clip having an extension, the extension having an opening for engagement with the terminal of the live pin, the neutral conductor having a ring terminal which is riveted onto the terminal of the neutral pin, the earth pin having a ring terminal which is riveted on the terminal of the earth pin, the extension of the second fuse clip being riveted onto the terminal of the live pin; and a cover engageable with the plug base alone respective peripheries for enclosing an inside of the plug base, the covering being at least partially fused to the plug base.
According to another aspect of the present invention, there is provided an electric plug to be connected with a cord having a live conductor and a neutral conductor, comprising: a plate-like plug base integrally having a live pin, a neutral pill and an earth pin, the live, neutral and earth pins standing on a outside surface of the plug base respectively and the live and neutral pins having terminals projecting from an inside surface of the plug base respectively; a fuse box integrally molded to the inside surface of the plug base, the fuse t)ox having a first pair of slit-like openings in its bottom for receiving a pair of holding portions of a first fuse clip and a second pair of slitlike openings in its bottom for receiving a pair of holding portions of a second fuse clip, the first and second fuse clips being attached onto the bottom of the fuse box from the inside surface side of the plug base respectively, the first fuse clip having a portion for crimping the live conductor of the cord, the second fuse clip having an extension, the extension having an opening for engagement with the terminal of the live pin, the neutral conductor having a ring terminal which is riveted onto the terminal of the neutral pin, the extension of the second fuse clip being riveted onto the terminal of the live pin; and a cover engageable with the plug base along respective peripheries for enclosing an inside of the plug base, the covering being at least partially fused to the plug base.
Figure 1 illustrates a perspective exploded view of an electric plug according to the present invention;
Figure 2 is a perspective view of a front face of the plug shown in Figure 1 after assembling;
Figure 3 is a perspective view of a back face of the plug after assembling;
Figure 4 is a perspective view of a front face cr outside face or engagement surface of a plug base;
Figure 5 is a perspective view of a back face or inside face of the plug base;
Figure 6 also illustrates the inside face of the pllg base, with fuse clips. conductors and a three-core ring cord being mounted thereon;
Figures 7(a)-7(c) illustrate perspective views of the various fuse clips, respectively;
Figure 8 shows an interior of a plug cover;
Figures 9(a) and 9(b) show modified terminals, respectively;
Figure 10 shows the three-core ring cord;
Figure 11 depicts an exploded perspective view of an electric plug according to another embodiment of the present invention;
Figure 12 depicts an inside face of a plug base of the plug shown in Figure 11;
Figure 13 also depicts the inside face of the plug base, with fuse clips, conductors and a two-core ring cord being mounted thereon;
Figure 14 illustrates an interior of a plug cover;
Figure 15 illustrates the two-core ring cord; and
Figure 16 is a perspective view of conventional clip, rivet and link strap.
Now, a first preferred embodiment of the present invention will be described with reference to Figures 1 to 10 of the accompanying drawings.
Referring first to Figures 1-3, an electric plug 1 includes a three-core cord 2 (this has a round shape n section), a plug base 3, a cover 4, a live pin 5 standing on "e plug base 3, a neutral pin 6 standing on the plug base 3 and (,rl earth pin 7 standing on the plug base 3. The plug base 3 and the cover 4 are one-piece elements, respectively, each being formed from an insulating material such as glass-containing polyamide, flame-retardant polybutylene telephthalete, polyphenylene oxide (PPO) and modified polyphenylene ether. The plug base 3 may he made from a modified polyphenylene ether resin. The live pin r, the neutral pin 6 and the earth pin 7 are respectively formed from brass. These pins 5, 6 and 7 may be either solid or hollow as long as they have sufficient strength.
As illustrated in Figures 2 and 4, the plug base 3 integrally has a fuse receiving box 8 at its center. The live pin 5, the neutral pin 6 and the earth pin 7 stand around the fuse receiving recess 8. These pins 5, 6 and 7 are formed when the plug base 3 is molded so that they are integral with the plug base 3. As shown in Figures 1 and 5, bottom er s (terminals) or root portions 5a, 6a and 7a of the live pin 5, tne neutral pin 6 and the earth pin 7 respectively project from .n inner surface of the plug base 3. The plug base 3 has a groove 9 along its periphery for faucet joint with the cover 4. The plug base 3 also integrally has a half bushing receptacle 11 for a cord bushing 10 of the cord 2.
As depicted in Figures 1 and 6, the bushing receptacle 11 defines a first recess 12, a second recess 14, a conductor exit 15 and a conductor entrance 16. The first recess 12 is shaped to receive a square front end 2a of the bushing 10. The second recess 14 is continuous from the first recess 12 and shaped to receive a reduced portion 2b after the front end 2.
The first recess 12 is open toward the fuse box 8 and the conductor exit 15 is defined by this opening. The second recess 14 is open in a direction opposite the fuse box 8 and the conductor entrance 16 is defined by this opening.
The bushing 10 is made from a flexible PVC (low molecular polyvinyl chloride) and integrally molded with the cord 2.
Therefore, when the front end 2a and the reduced portion 2b of the bushing 10 are fitted into the first recess 12 and the second recess 14 as illustrated in Figure 6, the cord 2 is fixed to the plug 3.
As shown in Figures 1, 5 and 6, the fuse box 8 has a positioning groove 17 centrally extending in a back surface of its bottom 8a. A partition wall 18 extends over the bottom 8a of the fuse box 8 along the groove 17 on the live pin side -o prevent short circuit between the fuse clip 28 and the conduct.r 19.
The positioning groove 17 linearly extends in thins illustrated embodiment, with one end thereof being open to the terminal 7a of the earth pin 7 and the other end being open to the bushing receptacle 11. As shown in Figure 6, part of an earth conductor 19 of the cord 2 is received in the groove 17. A ring terminal 20 which is integrally crimped on a free end of the earth conductor 19 engages with the terminal 7a of the earth pln 7 and then the terminal 7a is riveted to firmly join the earth conductor 19 with the terminal 7a. Accordingly, the earth conductor 19 and the earth pin 7 are electrically connected with each other. It should be noted that the terminal 7a and tne ring terminal 20 may be welded or fused to eacXh other.
As illustrated in Figures 1 and 5, the plug base 3 has rectangular or square portions 21 to support the terminals 5a alld 6a. The protrusion 21 for the terminal 6a has a ring terminal receiving area 22, which is defined by an annular recess around the terminal 6a. The same protrusion 21 also has a positioning groove 24 to receive a neutral conductor 23 of the cord 2. The positioning groove 24 is open to the ring terminal receiving area 22 at one end thereof and is open to the opening 15 of the bushing receptacle 11 at the other end.
Referring to Figure 6, the neutral conductor 23 s placed in the groove 24, and a ring terminal 25 which is firmly attached to a free end of the neutral conductor 23 by the crimping operation engages with the terminal 6a and fits in the ring terminal receiving space 22. After that, the terminal 6a is riveted to electrically connect the neutral pin 6 with the neutral conductor 23. It should be appreciated that the neutral terminal 6a and the ring terminal 25 may be welded or fused ;.o each other.
Referring to Figures 2 and 4, the fuse box 8 has a fuse opening or open entrance 26 in the exterior surface of the plug base 3. As shown in Figures 1 and 5, the fuse box 8 also has four slit-like openings 29 in its bottom. Two of the openings 29 are used to support or guide a pair of legs (holding portions) 27a of a fuse clip 27 (Figure 7(air and the other two are used lo support a pair of legs 28a of another fuse clip 28 (Figure 7(b)
The fuse clips 27 and 28 are attached onto the fuse box 8 from the exterior surface of the fuse box bottom, as shown in Figure 1, and their legs 27a and 28a extend or project into the fuse box 8. Figure 7(c) illustrates a modification of the fuse clip 27.
As illustrated in Figures 7(a) and 7(c), the fuse clip 27 has outwardly bent portions 27b at opposite free ends of the legs 27a for facilitating loading/unloading of a fuse 30 (Figure 2). The rounded portions 27a of the clip 27 can hold the fuse 30 due to their elasticity. The holding portions 27a are connected with each other by a connection potion 27c and the connec tion portion 27c has a crimping portion 31 for electrical connection with the conductor.
The crimping portion 31 includes a tongue 32 outwardly extending from the connection portion 27c and a pair of claws :33 extending from opposite sides of the tongue 32. As shown n
Figure 1, by bending the claws 33 simultaneously inward using a conventional crimping device, the live conductor 34 of the cord 2 placed on the tongue 32 is crimped by the claws 33. As a result, the fuse clip 27 is electrically connected with the li Je conductor 34 in a reliable mariner.
Referring to Figure 7(b), the fuse clip 28 also has a pair of holding portions 28a and their free ends 28b are befit outwardly for easier loading arid unloading of the fuse 30. Like the holding portions 27a, the holding portions 28a of the fuse clip 28 are rounded to correspond to the configuration of t'ie fuse 30. The holding portions 28a are connected by a connection portion 28c. arid the connection portion 28c has an extension 35 The cx tens ion 35 atlas a f 1 ange portion 36. s illustrated in Figure 6, when the iolding portions 28a of this clip 28 completely engage it the respective slit openings 9 and the connection portion 28c of the clip 28 contacts the ba(k surface of the fuse box 8, the flange portion 36 of the extension 35 seats on the mount 21 and an opening 37 of the flange portion 36 engages with the terminal 5a of the live pin 7).
After the fuse clip 28 is installed, the terminal 5a of the liv pin 5 is riveted onto the flange portion 36 of the fuse clip 28.
Therefore, the live pin 5 and the fuse clip 28 are now electrically connected with each other. It should be noted that the terminal 5a may be welded or fused to the flange 36.
Referring to Figures 7(a), 7(b) and 7(c), each of the fuse clips 27 and 28 has projections 38 on the holding portions 27a or 28a. The projections 38 hook on the periphery of t'le respective openings 29 of the fuse box 8 inside the fuse box 8 (.s the fuse clip is completely attached to the fuse box 8.
Referring to Figure 2, a main body of the fuse 30 's made of ceramics, and the fuse 30 is clamped at its main body by a clamping portion 40 of a fuse carrier 39 before the fuse 30 is placed in the fuse box 8. When the fuse 30 is placed into the fuse box 8, the fuse carrier 39 (or the fuse 30) is turned upside down (the fuse 30 directly faces the fuse box 8 in th. s situation) and loaded into a fuse box entrance 26, as indicated by the single-dash line. The fuse carrier 39 and the clampiitg claw 40 are adapted such that opposite ends of the fuse 30 are properly engaged in the holding portions 27a and 28a of the clips 27 and 28 when installation of the fuse carrier 39 and the fuse 30 into the fuse box 8 is completed.
It should be understood that an ultravIolet curi:ig resin (in liquid state) such as polyester-acrylate, epoxacrylate and polyurethane-acrylate may be dropped onto ttte connection between the terminal 6a of the neutral pin 6 and the ring terminal 25 and the ultraviolet ray may be irradiated onto the liquid resin to insulate the terminals 6a and 25. To accurately and smoothly join the plug base 3 with the cover 4, the plug base 3 may have a pair of ring members 41 near the fuse box 8 on its inner surface and four through bores 42 near its periphery on the bushing receptacle 11 side and the opposite side, as illustrated in Figures 1 and 5. In this case, the cover 4 may integrally have a pair of complementary guide pins 43 which engage with the ring members 41 respectively and four complementary claws 44 which engage with the bores 42 respectively, as illustrated in Figure 8.
Each guide pin 43 has a length to allow itself to start engaging with the mating ring member 41 before the periphery 5 of the cover 4 is joined with the plug base 3 by means of the faucet joint. When the cover 4 and the plug base 3 are completely joined by their own faucet joint, the guide pins 43 are completely fit in the respective ring members 41.
Each hook member 44 has a free end 48 including a wedge-shaped guide face 46 and a stop face 47, as shown in Figu-e 8. To join the cover 4 with the plug base 3, the free end 48 )f each hook member 44 is squeezed into the corresponding opening 2 of the plug base 3 and projects through the opening 42. Theft.
the stop face 47 hooks or claws the plug base 3 on the exterior surface of the plug base 3. Each hook member 44 has a length to realize tight joint between the cover 4 and the plug base 3 when the cover 4 and the plug base 3 are united by means of the faucet joint.
The cover 4 has a pair of protrusions 49 on its interior surface, as shown in Figure 8. These protrusions 49 have dimensions to abut and press the bridge portions 27c and 2Sc of the clips 27 and 28 when the periphery of the cover 4 engages with the peripheral groove 9 of the plug base 3 (faucet joint) (Figure 1). Accordingly, the clips 27 and 28 are pressed against the fuse box 8.
As understood from the above, simply inserting the guide pins 43 of the cover 4 into the ring members 41 and slightly pressing the cover 4 against the plug base 3 results in initial engagement between the locking members 44 and tf.-e openings 42, and further pressing the cover 4 against the plug base 3 till the periphery 45 of the cover 4 engages with te groove 9 of the plug base 3 results in tight engagement between the locking members 44 and the openings 42. In this manner, tne connection between the cover 4 and the plug base 3 is easily aitd accurately performed. Upon connection, the fuse clips 27 and 28 are substantially integrated with the plug base 3 and the cover 4 by the protrusions 49. Therefore, the fuse clips 27 and 28 are maintained in place even if they are subjected to vibrations.
Vibrations occur when the plug is inserted into and pulled out Jf a socket. The fuse clips 27 and 28 tended to move if they were not held by the protrusions 49.
The cover 4 has a half cylindrical member 50 extending outwardly from the periphery 45. as shown in Figure 8. This member 50 cooperates with the other half cylindrical member (bushing receptacle) 11 of the plug base 3 to conceal and protect a front reduced portion 2b of the cord bushing 10 when the cover 4 is united with the plug base 3, as shown in Figure 6.
Upon completion of electrical connection between the plug base 3 and various elements and physical engagement between the plug base 3 and the cover 4, ultrasonic welding or the like is performed to the entire physical connection between the plug base 3 and the cover 4. It should be noted that the welding may be performed to part of the physical connection if sufficient.
The physical connection between the cover 4 and the plug base 3 includes the engaging portion between the periphery 45 of the cover 4 and the groove 9 of the plug base 3 and the abutti-ig portion between the half cylindrical member 50 of the cover 4 al,d the bushing receptacle 11 of the plug base 3. This welding completes the assembling of the electric plug 1.
The electric plug 1 will undergo various electric tests after the fuse 30 is loaded into the fuse box 8.
As appreciated from the foregoing, the electric plug 1 according to the present invention has a greatly reduced number of rivetings. For example, no riveting is required when the welding is employed. This remarkably reduces a manufacturig cost of the plug 1 and improves reliability on electric:.l connection.
Figure 9(a) illustrates a modification of the fuse clip 28. Specifically, the extension 35 of the fuse clip 28 has a rounded portion 51 at its free end. This rounded portion 51 loosely fits over the terminal 5a of the live pin 5 and s tightly crimped thereafter using a suitable device. The crimpir.g electrically connects the fuse clip 28 with the terminal 58.
The portion 51 may be curled by a known tool or machine.
Figure 9(b) illustrates a modified terminal 52 which is used as extended terminals of the neutral conductor 23 and the earth conductor 19. The terminal 52 may be crimped over the terminal 6a of the neutral pin 6 or/and the terminal 7a of tlie earth pin 7.
The terminal 52 is generally shaped to "L" and has two pair of claws 33 at opposite ends. One pair of claws 3 clinches the conductor 23 or 19 and the other pair clinches the terminal 6a of the neutral pin 6 or the terminal 7a of the earth pin 7a. These pairs of claws 33 are crimped by a suitable to)l respectively to electrically connect the conductor 23 or 19 with the terminal 6a or 7a.
If the fuse clip 28 having the rounded portion 51 ,s employed to connect the fuse clip 28 with the terminal 5a of the live pin 5 and the L-shaped terminals 52 are employed to connect the neutral conductor 23 with the neutral pin 6 and to connect the earth conductor 19 with the grounding pin 7, no riveting is required. This brings about great improvement in manufacturing cost of the plug 1 and reliability on electrical connection.
In the illustrated embodiment, the guide pins 43 aiid the locking members 44 extend from the cover 4 and the ring members 41 and the openings 42 are formed on and in the plug base 3. However, it should be noted that the guide pins 43 ard the locking members 44 may extend from the plug base 3 and tte ring members 41 and the openings 42 may be provided on and in the cover 4.
Another electric plug according to the present invention will be described with reference to Figures 11 to 15.
The same or similar elements and parts of the electric plugs in the foregoing and this embodiments have the same or similar reference numerals and explanation of these elements will be omitted here.
In Figures 11 to 15, 1-1 designates an electric plug, 2-1 a two-core cord (this cord is flat in section), 3 a plug base, 4 a cover, 5 a live pin, 5a a terminal of the live pin 5, 6 a neutral pin, 6a a terminal of the neutral pin 6, 7 an earth pin, 7a a terminal of the earth pin 7, 8 a fuse box, 23 a neutr.l conductor, 25 a ring terminal of the neutral conductor 23, 7 and 28 fuse clips, 29 an opening of the fuse box 8, and 34 a li;e conductor.
One of major features of the plug 1-1 as compared with the foregoing embodiment lies in that the cord 2-1 is a two-co e ring cord which does not have the earth conductor 19, as shown in
Figure 11. Another feature, which concerns the plug base 3, is that the terminal 7a of the earth pin 7 is completely embedded and concealed inside a projection 50 formed on an inner surface of the plug base 3, as shown in Figures ii to 13. This prevents the earth terminal 7a from being connected with the live or neutral pin and from being grounded.
Further, no groove is formed along the periphery of tlle plug base 3 (groove 9 is formed in tie First embodiment; Figure 1). Instead, as shown in Figure 14, a sty portion 9-i is formed in an inner periphery of the cover 4. The step portion 9-1 is used to join the cover 4 with the plug base 3 by means of faucet joint.
Referring back to Figure 11, a pair of guide pedestals 43-1 stands beside the bushing receptacle 11 on the plug base '3.
The cover 4 has a pair of complementary members 43-2 near the half cylindrical member 50 inside itself, as illustrated in
Figure 14. When the cover 4 is placed over the plug base 3, the pedestals 43-1 engage with the quarter cylindrical members 43-2 respectively.
The above-described structure simplifies the configuration of the electric plug and reduces the weight and manufacturing cost of the same. As depicted in Figures 11 to 14, tle electric plug 1-1 of this embodiment does not have positioning grooves 17 and 24, locking members 44, openings 42, guide pins '--3 and openings 41.
Installation of fuse clips 27 and 28 (Figures 7(a) to 7(c)) into openings 29 of a fuse box 8, electrical connection f neutral conductor 23 and live conductor 34, and welding between the plug base 3 and the cover 4 may be conducted in the same manner as the previous embodiment. Regarding the electrical connection, therefore, the same reliability as the first embodiment can be expected.
Claims (25)
1. An electric plug to be connected with a cord having a live conductor, a neutral conductor and an earth conductor, comprising:
a plate-like plug base integrally having a live pin, a neutral pin and an earth pin, the live, neutral and earth pins standing on an outside surface of the plug base respective-ly and having terminals projecting from an inside surface of t plug base respectively;
a fuse box integrally molded to the inside surface of the plug base, the fuse box having a first pair of slit-like openings in its bottom for receiving a pair of holding portions of a first fuse clip and a second pair of slit-like openings in its bottom for receiving a pair of holding portions of a second fuse clip, the first and second fuse clips being attached oni'.) the bottom of the fuse box from the inside surface side of title plug base respectively, the first fuse clip having a portion for crimping the live conductor of the cord, the second fuse clip, having an extension, the extension having an opening for engagement with the terminal of the live pin, the neutral conductor having a ring terminal which is riveted onto the terminal of the neutral pin, the earth pin having a ring terminal which is riveted on the terminal of the earth pin, the extension of the second fuse clip being riveted onto the terminal of the live pin; and
a cover engageable with the plug base along respective peripheries for enclosing an inside of the plug base, the covering being at least partially fused to the plug base.
2. The electric plug of claim 1, wherein the cover has a pair of projections on its inner surface to press the first and second fuse clips respectively against the bottom of the fuse box when the cover engages with the plug base, each fuse clip being pressed at a portion connecting the holding portions.
3. The electric plug of claim 1 or 2, wherein the cord has a bushing made from a flexible insulating resin at its free ends and the cord is firmly connected to the plug base via tee bushing.
4. The electric plug of claim 1, 2 or 3, wherein the plug base has a partition wall for electrically separating the extension of the second fuse clip from the conductors of the cord.
5. The electric plug of any preceding claim, wherein the plug base has a groove along its inner periphery so that the cover and tie plug base engage with each other by means of faucet joint.
6. An electric plug to be connected with a cord having a live conductor, a neutral conductor and an earth conductor, comprising:
a plate-like plug base integrally having a live pin, a neutral pin and an earth pin, all the pins standing on an outside surface of the plug base and having terminals projecting from an inside surface of the plug base;
a fuse box integrally molded to the inside surfac2 of the plug base, the fuse box having a first pair of slit-like openings in its bottom for receiving a pair of holding portions of a first fuse clip and a second pair of slit-like openings in its bottom for receiving a pair of holding portions of a second fuse clip, the first and second fuse clips being attached onto the bottom of the fuse box from the inside surface side of th plug base respectively, the first fuse clip having a portion for crimping the live conductor of the cord, the second fuse clip having an extension to be crimped or welded onto the terminal of the live pin, the neutral conductor being crimped or welded onto the terminal of the neutral pin, the earth pin being crimped or welded onto the terminal of the earth pin; and
a cover engageable with the plug base along respective peripheries for enclosing an inside of the plug base, the covering being at least partially fused to the plug base.
7. The electric plug of claim 6, wherein the cover has a pair of projections on its inner surface to press the first and second fuse clips respectively against the bottom of the fuse box when the cover engages with the plug base, each fuse clip being pressed at a portion connecting the holding portions.
8. The electric plug of claim 6 or 7, wherein the cord has a bushing made from a flexible insulating resin at its free end, and the cord is firmly connected to the plug base via the bushing.
9. The electric plug of claim 6,7 or 8, wherein the plug base has a partition wall for electrically separating the extensi-on of the second fuse clip from the conductors of the cord.
10. The electric plug of any of claims 6 to 9, wherein the plug base has a groove along its inner periphery so that the cover and the plug base engage with each other by means of faucet joint.
11. An electric plug to be connected with a cord having a live conductor and a neutral conductor, comprising:
a plate-like plug base integrally having a live pin, a neutral pin and an earth pin, the live, neutral and earth pins standing on an outside surface of the plug base respective-ly and the live and neutral pins having terminals projecting from an inside surface of the plug base respectively;
a fuse box integrally molded to the inside surface of the plug base, the fuse box having a first pair of slit-like openings in its bottom for receiving a pair of holding portions of a first fuse clip and a second pair of slit-like openings in its bottom for receiving a pair of holding portions of a second fuse clip, the first and second fuse clips being attached on the bottom of the fuse box from the inside surface side of tte plug base respectively, the first fuse clip having a portion for crimping the live conductor of the cord, the second fuse clip having an extension, the extension having an opet) i ng four engagement wi th the terminal of the live pir), tile rleutral conductor having a ring terminal which is riveted otito the terminal of the neutral pin, the extension of the secon(i fuse clip being riveted onto the terminal of the live pin; and
a cover engageable with the plug base along respective peripheries for enclosing an inside of the plug base, the covering being at least partially fused to the plug base.
12. The electric plug of claim 11, wherein the cover has a pair of projections on its inner surface to press the first and second fuse clips respectively against the bottom of the fuse box when the cover engages with the plug base, each fuse clip being pressed at a portion connecting the holding portions.
13. The electric plug of claim 11, wherein the cord has a bushing made from a flexible insulating resin at its free end, and the cord is firmly connected to the plug base via the bushing.
14. The electric plug of claim 11 or 12, wherein the cover has a groove along its inner periphery so that the cover and the plug base engage with each other by means of faucet joint.
15. An electric plug to be connected with a cord having a live conductor and a neutral conductor, comprising:
a plate-like plug base integrally having a live pin, a neutral pin and an earth pin, all the pins standing on an outside surface of the plug base and the live and neutral pins having terminals projecting from an inside surface of the plug base;
a fuse box integrally molded to the inside surface of the plug base, the fuse box having a first pair of slit-like openings in its bottom for receiving a pair of holding portions of a first fuse clip and a second pair of slit-like openings in its bottom for receiving a pair of holding portions of a second fuse clip, the first and second fuse clips being attached onto the bottom of the fuse box from the inside surface side of the plug base respectively, the first fuse clip having a portion for crimping the live conductor of the cord, the second fuse cli;r having an extension to be crimped or welded onto the terminal of the live pin, the neutral conductor being criin)cd or welded onto the terminal of the neutral pin; and
a cover engageable with the plug base along respective peripheries for enclosing an inside of the plug base, the covering being at least partially fused to the plug base.
16. The electric plug of claim 15, wherein the cover has a pair of projections on its inner surface to press the first and second fuse clips respectively against the bottom of the fuse box when the cover engages with the plug base, each fuse clip being pressed at a portion connecting the holding portions.
17. The electric plug of claim 15 or 16, wherein the cord has a bushing made from a flexible insulating resin at its free end, and the cord is firmly connected to the plug base via t bushing.
18. The electric plug of claim 15, 16 or 17, wherein the cover has a groove along its inner periphery so that the cover and the plug base engage with each other by means of faucet joint.
19. An electric plug to be connected with a cable having a live conductor and a neutral conductor, comprising:
a plug base;
a live pin and a neutral pin projecting on the outside surface of the plug base, each pin having a connection terminal accessible from the inside surface of the plug base;
a fuse box integrally formed in the plug base for receiving a fuse from the outside surface of the plug base;
fuse connection means for electrically connecting a fuse placed within the fuse box with first and second connection terminals accessible from the inside surface of the plug base, the first connection terminal being electrically connected to the connection terminal of the live pin; and
a plug cover engageable with the plug base, the engagement between the plug cover and the plug base being such as to allow the plug to be sealed so as to render it non-rewirable by a user; wherein:
the connection between the live pin connection terminal and the first connection terminal of the fuse connection means is formed by a non-riveting method, or at least one of the neutral pin connection terminal and the second connection terminal of the fuse connecting means is adapted to receive a conductor by a non-riveting method.
20. A plug base for use in a plug according to claim 19, comprising:
a live pin and a neutral pin projecting on the outside surface of the plug base, each pin having a connection terminal accessible from the inside surface of the plug base;
a fuse box integrally formed in the plug base for receiving a fuse from the outside surface of the plug base; and
fuse connection means for electrically connecting a fuse placed within the fuse box with first and second connection terminals accessible from the inside surface of the plug base, the first connection terminal being electrically connected to the connection terminal of the live pin; wherein:
the connection between the live pin connection terminal and the first connection terminal of the fuse connection means is formed by a non-riveting method, or at least one of the neutral pin connection terminal and the second connection terminal of the fuse connecting means is adapted to receive a conductor by a non-riveting method.
21. An electric plug to be connected with a cable having a live conductor, a neutral conductor and an earth conductor, comprising:
a plug base;
a live pin, a neutral pin and an earth pin projecting on the outside surface of the plug base, each pin having a connection terminal accessible from the inside surface of the plug base;
a fuse box integrally formed in the plug base for receiving a fuse from the outside surface of the plug base;
fuse connection means for electrically connecting a fuse placed within the fuse box with first and second connection terminals accessible from the inside surface of the plug base, the first connection terminal being electrically connected to the connection terminal of the live pin; and
a plug cover engageable with the plug base, the engagement between the plug cover and the plug base being such as to allow the plug to be sealed so as to render it non-rewirable by a user; wherein:
the connection between the live pin terminal and the first connection terminal of the fuse connection means is formed by a non-riveting method, or at least one of the neutral pin connection terminal, the earth pin connection terminal and the second connection terminal of the fuse connecting means is adapted to receive a conductor by a non-riveting method.
22. A plug base for use in a plug according to claim 21, comprising:
a live pin, a neutral pin and an earth pin projecting on the outside surface of the plug base, each pin having a connection terminal accessible from the inside surface of the plug base;
a fuse box integrally formed in the plug base for receiving a fuse from the outside surface of the plug base; and
fuse connection means for electrically connecting a fuse placed within the fuse box with first and second connection terminals accessible from the inside surface of the plug base, the first connection terminal being electrically connected to the connection terminal of the live pin; wherein:
the connection between the live pin terminal and the first connection terminal of the fuse connection means is formed by a non-riveting method, or at least one of the neutral pin connection terminal, the earth pin connection terminal and the second connection terminal of the fuse connecting means is adapted to receive a conductor by a non-riveting method.
23. A plug or plug base according to any of claims 19 to 22, wherein said non-riveting technique is one of crimping, welding and fusing.
24. A plug substantially as described hereinbefore with reference to, or as shown in, the accompanying drawings.
25. A plug base substantially as described hereinbefore with reference to, or as shown in, the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23166793 | 1993-09-17 | ||
| JP6025274A JPH07135050A (en) | 1993-09-17 | 1994-02-23 | Electric power supply plug |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9418670D0 GB9418670D0 (en) | 1994-11-02 |
| GB2282713A true GB2282713A (en) | 1995-04-12 |
| GB2282713B GB2282713B (en) | 1997-12-10 |
Family
ID=26362872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9418670A Expired - Fee Related GB2282713B (en) | 1993-09-17 | 1994-09-16 | Power supply plugs |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH07135050A (en) |
| GB (1) | GB2282713B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2293500A (en) * | 1994-09-20 | 1996-03-27 | Powerbreaker Plc | Plug body for electric plug |
| GB2299716A (en) * | 1995-04-05 | 1996-10-09 | On Tat Bakelite Electric Works | Non-rewirable plug |
| GB2383201A (en) * | 2001-12-14 | 2003-06-18 | Packway Ind Ltd | Electrical power plug with eye end piece connectors |
| US7019612B2 (en) * | 2003-12-16 | 2006-03-28 | Chia Ho Lin | Fuse seat for filter |
| WO2011029605A1 (en) * | 2009-09-09 | 2011-03-17 | Thomas Waible | Plug connector and method for producing a plug connector |
| GB2479992A (en) * | 2010-04-28 | 2011-11-02 | Gem Terminal Ind Co Ltd | Inner frame for an electrical plug |
| WO2012060869A1 (en) * | 2010-11-03 | 2012-05-10 | Tyco Electronics Corporation | In-line fused connector |
| DE102011103108A1 (en) * | 2011-05-25 | 2012-11-29 | Taller Gmbh | Plug bridge for electrical appliance plug to attach household appliance to socket of alternating current system, has phase-, neutral- and/or earth conductor pins, chamfer and insulation part provided with surfaces made of metal sheet |
| WO2013016897A1 (en) * | 2011-08-03 | 2013-02-07 | Ying Wugang | British type plug |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100349330C (en) * | 2005-07-29 | 2007-11-14 | 刘锦泰 | Plug assembly for preventing short circuit between plug inner pole |
| TW200937776A (en) * | 2008-02-19 | 2009-09-01 | Gem Terminal Ind Co Ltd | Inner frame of plug capable of holding a fuse |
| CN108233034A (en) * | 2018-02-26 | 2018-06-29 | 深圳市大塑实业有限公司 | Safety plug and electrical equipment |
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| GB2003676A (en) * | 1977-09-05 | 1979-03-14 | Nettle Accessories Ltd | Non-rewirable connector |
| GB2004707A (en) * | 1977-09-05 | 1979-04-04 | Nettle Accessories Ltd | Wire-terminal connections |
| GB2043031A (en) * | 1979-02-15 | 1980-10-01 | Sterilin Ltd | Container and method for sampling |
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| GB1581663A (en) * | 1977-08-17 | 1980-12-17 | Ward Goldstone Ltd | Internal insulating cover for incorporation in an electrical plug |
| GB1595782A (en) * | 1976-10-08 | 1981-08-19 | Lucas Industries Ltd | Electrical plug and lead assembly |
| GB1604426A (en) * | 1977-06-16 | 1981-12-09 | Bicc Ltd | Method of manufacturing an electric plug assembly |
| GB2092836A (en) * | 1981-02-05 | 1982-08-18 | Lucas Industries Ltd | Electrical plugs |
| GB2152301A (en) * | 1983-12-13 | 1985-07-31 | Irish Driver Harris Company Li | A non-rewirable electrical plug and a method of moulding therefor |
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- 1994-02-23 JP JP6025274A patent/JPH07135050A/en active Pending
- 1994-09-16 GB GB9418670A patent/GB2282713B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1595782A (en) * | 1976-10-08 | 1981-08-19 | Lucas Industries Ltd | Electrical plug and lead assembly |
| GB1604426A (en) * | 1977-06-16 | 1981-12-09 | Bicc Ltd | Method of manufacturing an electric plug assembly |
| GB1581663A (en) * | 1977-08-17 | 1980-12-17 | Ward Goldstone Ltd | Internal insulating cover for incorporation in an electrical plug |
| GB2003676A (en) * | 1977-09-05 | 1979-03-14 | Nettle Accessories Ltd | Non-rewirable connector |
| GB2004707A (en) * | 1977-09-05 | 1979-04-04 | Nettle Accessories Ltd | Wire-terminal connections |
| GB2043031A (en) * | 1979-02-15 | 1980-10-01 | Sterilin Ltd | Container and method for sampling |
| EP0016269A1 (en) * | 1979-03-19 | 1980-10-01 | BICC Public Limited Company | An improved electric plug assembly |
| GB2092836A (en) * | 1981-02-05 | 1982-08-18 | Lucas Industries Ltd | Electrical plugs |
| GB2152301A (en) * | 1983-12-13 | 1985-07-31 | Irish Driver Harris Company Li | A non-rewirable electrical plug and a method of moulding therefor |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2293500A (en) * | 1994-09-20 | 1996-03-27 | Powerbreaker Plc | Plug body for electric plug |
| GB2299716A (en) * | 1995-04-05 | 1996-10-09 | On Tat Bakelite Electric Works | Non-rewirable plug |
| GB2383201A (en) * | 2001-12-14 | 2003-06-18 | Packway Ind Ltd | Electrical power plug with eye end piece connectors |
| US7019612B2 (en) * | 2003-12-16 | 2006-03-28 | Chia Ho Lin | Fuse seat for filter |
| 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 |
| TWI403034B (en) * | 2010-04-28 | 2013-07-21 | ||
| GB2479992A (en) * | 2010-04-28 | 2011-11-02 | Gem Terminal Ind Co Ltd | Inner frame for an electrical plug |
| GB2479992B (en) * | 2010-04-28 | 2014-11-12 | Gem Terminal Ind Co Ltd | Inner frame for plug |
| WO2012060869A1 (en) * | 2010-11-03 | 2012-05-10 | Tyco Electronics Corporation | In-line fused connector |
| US8328581B2 (en) | 2010-11-03 | 2012-12-11 | Tyco Electronics Corporation | In-line fused connector |
| DE102011103108B4 (en) * | 2011-05-25 | 2012-12-06 | Taller Gmbh | Connector bridge with closed folding pins |
| DE102011103108A1 (en) * | 2011-05-25 | 2012-11-29 | Taller Gmbh | Plug bridge for electrical appliance plug to attach household appliance to socket of alternating current system, has phase-, neutral- and/or earth conductor pins, chamfer and insulation part provided with surfaces made of metal sheet |
| WO2013016897A1 (en) * | 2011-08-03 | 2013-02-07 | Ying Wugang | British type plug |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2282713B (en) | 1997-12-10 |
| JPH07135050A (en) | 1995-05-23 |
| GB9418670D0 (en) | 1994-11-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19980916 |