ELECTRIC PLUG BACKGROUND OF THE INVENTION Technical Field of the Invention The present invention relates to an electric plug. More particularly, it relates to an electric plug that has a case, contact receivers held in the case, blade-shaped contacts and round-shaped contacts respectively provided to contact receivers and alternately coming in and going out of the contact receivers. The blade-shaped contacts can be turned by a given angle while being protruded, and the shape of its terminal can be various by the angle of turning of the blade-shaped contacts and by either the blade-shaped contacts'coming-in and going-out or the round-shaped contacts'coming-in and going-out so that domestic electrical appliances can be used in foreign countries without regard to the shape of plugs. In addition, the inventive plug is simple in construction, which makes it easy to use and enhances the production yield and decreases the production costs due to the reduction in volume. costs due to the reduction in volume.

Discussion of Related Art Many countries have generally used electric plugs and sockets different in shape according to their features. If a different electric plug of the other country is used at home, an electric appliance with that electric plug cannot be used since there is no socket mating with the electric plug. In order to solve this problem, electric plugs and sockets of various shapes have been proposed.

FIG. 1 depicts a conventional electric plug assembly. On the upper surface of a case 1 is formed a plug connecting part 2. Plugs 3 generally used in Europe, US, Japan, Korea, etc. are provided to the outer surface of case 1. Plug contacting part 2 is rotatably provided, and electrically connected to corresponding plugs being on the position where contacting part 2 rotates and stops.

To use a domestic electric appliance in a foreign country, in the conventional multiplug, plug contacting part 2 is turned to plug 3 the same as the foreign country's plug while the plug of the domestic electric appliance is being joined to plug contacting part 2 so that plug contacting part 2 is electrically connected to the foreign country's plug 3. Thus, if a user inserts plug 3 into the foreign country's socket, the power is applied to the electric appliance through plug 3 and plug contacting part 2 so that he or she can use the domestic electric appliance in the foreign country using

different plugs.

As shown in FIG. 1, the conventional plug assembly has a plurality of plugs formed on the outer surface of the case protruding to the outside, and it is inconvenient to carry it by the protruding plugs. Since another plugs cannot be inserted into the adjacent socket due to the protruding plugs during use, it is not efficient to use the multiplug assembly. In addition, a plurality of protruding plugs increase the plug assembly in volume, and complicates its structure and raises the production costs.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electric plug that has a case, contact receivers held in the case, blade-shaped contacts and round-shaped contacts respectively provided to contact receivers and alternately coming in and going out of the contact receivers, in which the blade-shaped contacts can be turned by a given angle while being protruded, and the shape of its terminal can be various by the angle of turning of the blade-shaped contacts and by either the blade-shaped contacts'coming-in and going-out or the round-shaped contacts'coming-in and going-out so that domestic electrical appliances can be used in foreign countries

without regard to the shape of plugs, and its simple construction makes it easy to use and enhances the production yield and decreases the production costs due to the reduction in volume.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the present invention provides an electric plug including at least two blade-shaped contacts each having on its front end blade-shaped contacting portion inserted into a socket ; at least two contact receivers each holding the blade-shaped contacts while protruding each blade-shaped contact; and a case holding the receivers so as to let any one of the receivers be moved to left and right within a predetermined range.

According to another aspect of the present invention, an electric plug includes at least two blade-shaped contacts each having on its front end blade-shaped contacting portion inserted into a socket; at least two contact receivers each holding the blade-shaped contacts so as to let them turn while protruding each blade-shaped contact; and a case holding the contact receivers. The case holds the contact receivers so as to let anyone of the receivers be moved to left and right within a predetermined range.

According to still another aspect of the present invention, an electric plug

includes at least two round-shaped contacts each having a lengthwise cut-off part formed from its front end to a given point of its body, and on the front end a round- shaped contacting portion inserted to a socket; at least two blade-shaped contacts each inserted into the cut-off parts of the respective round-shaped contacts, and having on its front end blade-shaped contacting portions inserted into a socket; at least two contact receivers each holding the round-shaped contacts respectively receiving the blade-shaped contacts; a contact outgoing and incoming operating body making each round-shaped contacting portion and each blade-shaped contacting portion selectively come in and go out of each contact receiving body; and a controller controlling the operation of the contact outgoing and incoming operating body.

The electric plug may further include an angle controller controlling the angle of turning of the respective blade-shaped contacting portions.

The electric plug may further include a contact moving part moving the contact receivers to left or right within a predetermined range to control an interval between the contact receivers.

BRIEF DESCRIPTION OF THE ATTACHED DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the drawings: In the drawings: FIG. 1 depicts a conventional electric plug; FIG. 2 is a perspective view of an electric plug according to a first preferred embodiment of the present invention; FIG. 3 is a sectional view of the electric plug according to the first preferred embodiment of the present invention; FIG. 4 is a sectional view of the operating state of the electric plug according to the first preferred embodiment of the present invention; FIG. 5 shows the operating relation of round-shaped contacts and blade- shaped contacts applied to the first preferred embodiment of the present invention; FIG. 6 is a perspective view of the protruding blade-shaped contacts according to the first preferred embodiment of the present invention; FIG. 7 is a front view of the operating state of the electric plug according to the first preferred embodiment of the present invention; FIG. 8 depicts terminals in various shapes embodied by the electric plug of the first preferred embodiment of the present invention; FIG. 9 is a cross-sectional view of an electric plug with blade-shaped contacts protruding and being fixed according to a second embodiment of the present 5 invention; FIG. 10 is a longitudinal sectional view as taken along line of FIG. 9's A- A; FIG. 11 is a cross-sectional view of the electric plug with round-shaped contacts protruding and being fixed according to the second embodiment of the 10 present invention; FIG. 12 is a longitudinal sectional view as taken along line of FIG. 11's B- B ; FIG. 13 is a perspective view showing the relation of a contact receiver's contact through hole and the blade-shaped contacts protruding from the electric plug 15 of the second preferred embodiment of the present invention; FIG. 14 is a longitudinal sectional view as taken along line of FIG. 13's C- C; rating body; FIG. 15 is a perspective view showing the relation of a contact receiver's

contact through hole and the round-shaped contacts protruding from the electric plug of the second preferred embodiment of the present invention; FIG. 16 is a perspective view of FIG. 9's blade-shaped contact outgoing and incoming operating body; FIG. 17 is a perspective view of FIG. 11's round-shaped contact outgoing and incoming operating body; FIG. 18 is a partially cut-away perspective view of the rear end of FIG. 12's contact receiver; FIG. 19 is a perspective view of FIG. 12's contact selecting member; FIG. 20 is a rear view of the electric plug according to the second preferred embodiment of the present invention; and FIG. 21 is a front view showing the various positions of various blade- shaped contacts according to the second preferred embodiment of the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT Reference will now be made in detail to a first preferred embodiment of the present invention, examples of which are illustrated in FIGS. 1 to 8.

As depicted in the drawings, an electric plug of the first preferred embodiment includes a case 110, contact receivers 120a and 120b, round-shaped contacts 140a and 140b, blade-shaped contacts 130a and 130b, and a supporting plate 132. Case 110 constitutes the outer shape of the inventive electric plug, and has a 5 guide hole 111 on one side of its front surface, and a guide race 112 of a given length along which a press button 133 of supporting plate 132 that will be described later) is moved forward and backward at both sides of its rear end. Round-shaped contacts 140a and 140b and blade-shaped contacts 130a and 130b are seated in contact receivers 120a and 120b. Each of contact receivers 120a and 120b is tube shaped 10 with a hollow inside, and almost of its body is held in case 110 and its front end protrudes to the outside of case 110. Each of contact receivers 120a and 120b has a circular opening 122 on its front surface, and round-shaped contacts 140a and 140b and blade-shaped contacts 130a and 130b go in and come out through these openings 122.

15 Round-shaped contacts 140a and 140b protrude to the front of contact receivers 120a and 120b to form a round terminal. Round-shaped contact 140a's semicircular body faces with that of round-shaped contact 140b, thus forming a round terminal. Each of round-shaped contacts 140a and 140b has a jaw 143 on its

front portion to mate with a race 135 of respective blade-shaped contacts 130a and 130b.

A guide baton 141 is provided to the rear end of each of round-shaped contacts 140a and 140b to move forward and backward in each contact receiver 120a and 120b. Guide batons 141 respectively support round-shaped contacts 140a and 140b, being supported by springs 142 in contact receivers 120a and 120b. Round- shaped contacts 140a and 140b are moved forward by the elasticity of springs 142 so long as openings 122 are not closed, and are protruding to the outside of contact receivers 120a and 120b.

Blade-shaped contacts 130a and 130b form a blade-shaped terminal. The bodies of blade-shaped contacts 130a and 130b are inserted into round-shaped contacts 140a and 140b and guide batons 141. Ends of extending batons 11 extending along to the rear end of blade-shaped contacts 140a and 140b are joined to supporting plate 132 that will be described later.

A spring 134 is provided to the outer surface of each of extending batons 131 and generates an elasticity pushing blade-shaped contacts 130a and 130b to the outside of contact receivers 120a and 120b. Blade-shaped contacts 130a and 130b rush out to the front by the elasticity of springs 134 as a user pushes round-shaped

contacts 140a and 140b with fingers to open openings 122 to a certain degree. Race 135 is formed in the middle of each of blade-shaped contacts 130a and 130b to prevent contacts 130a and 130b from being moved backward when contacts 130a and 130b are moved forward.

As a user slightly turns blade-shaped contacts 130a and 130b while blade- shaped contacts 130a and 130b are moved forward, races 135 respectively mate with jaws 143 as shown in FIG. 5, and blade-shaped contacts 130a and 130b are not moved back anymore so there is no problem in inserting blade-shaped contacts 130a and 130b into a socket. As shown in FIGS. 8b and 8c, various shaped terminals can be embodied according to angles of turning blade-shaped contacts 130a and 130b.

Supporting plate 132 to which extending batons 131 of blade-shaped contacts 130a and 130b are joined has a sectional shape of F and includes a press button 133 formed on both sides of case 110 protruding to the outside. Once a user pushes press button 133 while blade-shaped contacts 130a and 130b are protruding to the front of contact receivers 120a and 120b, extending batons 131 are moved back along with supporting plate 132, so blade-shaped contacts 130a and 130b go back to the inside of receivers 120a and 120b. Thus, round-shaped contacts 140a and 140b are moved forward by the elasticity of spring 142.

According to the present invention, a distance between contact receivers 120a and 120b can be easily controlled. As shown in FIG. 3, a handle 121 is formed on one side of contact receiver 120a inserted into guide hole 111 formed on the front surface of case 110, and as a user pulls handle 121, contact receiver 120a of one side 5 is moved to the left and right in guide hole 111.

As contact receiver 120a of one side is moved to the left and right, a distance between round-shaped contacts 140a and 140b or that of blade-shaped contacts 130a and 130b can be controlled regardless of the size of intervals of plug insertion holes of a socket.

10 The operation of the present invention is now described in detail.

Referring to FIG. 2, blade-shaped contacts 130a and 130b are each in contact receivers 120a and 120b, and round-shaped contacts 140a and 140b are protruding to the outside of contact receivers 120a and 120b.

In order to protrude blade-shaped contacts 130a and 130b to the outside of 15 receivers 120a and 120b, a user pushes protruding round-shaped contacts 140a and 140b against a desk and the like. If round-shaped contacts 140a and 140b are each completely introduced to the inside of contact receivers 120a and 120b, openings 122 are opened to make a space in each opening 122 so that blade-shaped contacts 130a

and 130b spring forth through these spaces. At this point, blade-shaped contacts 130a and 130b are moved forward by the elasticity of spring 134 out of contact receivers 120a and 120b, as shown in FIG. 4.

As blade-shaped contacts 130a and 130b are moved forward, a user turns those contacts 130a and 130b slightly by a given angle with the hand to make races 135 with jaws 143 so that blade-shaped contacts 130a and 130b cannot be moved back.

In this state, blade-shaped contacts 130a and 130b are used as a blade terminal. Various terminals, as depicted in FIGS. 8A, 8B, and 8C, can be embodied according to an angle by which blade-shaped contacts 130a and 130b are turned which blade-shaped contacts 130a and 130b are being moved forward.

In order to put protruding blade-shaped contacts 130a and 130b in contact receivers 120a and 120b and to move round-shaped contacts 140a and 140b in receivers 120a and 120b forward, a user pulls press buttons 133, each provided to both sides of case 110, back with the hand.

When pulling press buttons 133 back, since extending batons 131 are moved back along supporting plate 132, round-shaped contacts 140a and 140b are completely moved back to the inside of contact receivers 120a and 120b. When round-shaped contacts 140a and 140b each pass through openings 122 and completely enter receivers 120a and 120b, openings 122 are opened and round- shaped contacts 140a and 140b protrude to the front of receivers 120a and 120b by the elasticity of spring 142 so that round-shaped contacts 140a and 140b can be used 5 as a round terminal.

FIG. 9 is a cross-sectional view of an electric plug with blade-shaped contacts protruding and being fixed according to a second embodiment of the present invention.

FIG. 10 is a longitudinal sectional view as taken along line of FIG. 9's A-A.

10 As shown in FIGS. 9 and 10, the electric plug of the second preferred embodiment includes a case 200, a pair of contact receivers 210 arranged running parallel with each other within case 200, and a pair of blade-shaped contacts 250 partially going out of and coming in respective receivers 210 while being seated in contact receives 210.

15 The plug also includes a pair of round-shaped contacts 230 partially going out of and coming in respective receivers 210, blade-shaped contact outgoing and incoming operating body 260 controlling outgoing and incoming of blade-shaped contacts 250, a protruding contact selecting member 280, and a feed lever 290

transferring contact selecting member 280 forward and backward. Case 200 includes an upper case 201 and a lower case 202. A lead hole 205 is formed on a given place of case 200, e. g. case 200's rear end, through which a leas is out. A fixed bush 206 is tightly fitted into lead hole 205 and serves to hold the lead not to be easily off by an external force.

FIG. 20 is a rear view of the electric plug of the second preferred embodiment.

As depicted in FIG 20, a guide hole 207 is lengthwise provided to a given point of lower case 202's lower side to guide and limit a movement of a pulling lug (that will be described later). A guide hole is widthwise provided to the front surface of case 200 to control an interval between contacts 230 and 250.

Respective contact receivers 210, a hollow body, are provided to the right and left of case 200. Left contact receiver 210 (lower one in FIG. 9) is fixedly installed in case 200, and right contact receiver 210 is installed to be moved to the right and left for controlling an interval between contacts 230 and 250.

In order to do this, a race 203 is provided to lower case 201, and a set protrusion 219a is provided to right contact receiver 210 to mate with race 203.

FIG. 13 is a perspective view showing the relation of a contact receiver's contact through hole and the blade-shaped contacts protruding from the electric plug of the second preferred embodiment.

As shown in FIG. 13, contact through hole 211 includes outgoing and incoming allowance holes 212 allowing round-shaped contacts 230 and blade-shaped 5 contacts 250 to come in and go out of each contact receiver, and keeping rims 213 each adjacent to ends of outgoing and incoming allowance holes 212 and protruding to the front.

The angle of formation of outgoing and incoming allowance holes 212 and keeping rims 213 can be properly set up with regard to blade-shaped contact 250's 10 set angle. Rims 213 are each in tapered shape and have a rear part with a larger diameter. Thus, blade-shaped contacts 250 are not moved back by such tapered portions 217 when inserting the electric plug into a socket. A position set pin 215 is provided to an upper part of each contact receiver 210's hollow portion passing through respective contact receivers 210. Such a position set pin 215 mates with a 15 position set race (that is described later), and fixes each round-shaped bar 230 to a protruding (moving-forward) position and a receiving (moving-back) position. A conductive cylindrical body 214 preferably made of copper is forced into each contact receiver 210's rear portion to create an electrical path by contacting respective contacts 230 and 250.

FIG. 18 is a cut-away perspective view of the contact receiver's rear end depicted in FIG. 12. As depicted in FIG. 18, a guide hole 216 is provided to each contact receiver 210's lower part and serves to guide and limit a movement of 5 keepers 271 holding and moving round-shaped contacts 230 forward and backward.

Reference numeral 218 designates a lid provided to each contact receiver 210's rear end to support a spring that will be described later. Reference numerals 218a and 219 denote an extending baton through hole and a lead connector interposed between lead 218 and conductive cylindrical body 214. The lead being connected with 10 connector 219 may be drawn out of case 200 passing through bush 206.

Blade-shaped contact 250 has a blade-shaped contacting portion 251, and a position setting groove 255 formed widthwise on both sides of blade-shaped contacting portion 251's outer surface and serving to set blade-shaped contact 250 not to be moved back by the mutual action with contact receiver 210's keeping rim 15 213 when protruding blade-shaped contacting portion 251.

Blade-shaped contact 250 also has a tapered portion 253 formed adjacent to position setting groove 255 and serving to prevent blade-shaped contact 250 from being moved forward too far from contact receiver 210 with its relatively broader width than blade-shaped contacting portion 251's, a root 254 formed at the rear of tapered portion 253 and relatively thicker than blade-shaped contacting portion 251 to prevent blade-shaped contact 250 from being moved up and down in round-shaped contact 230's central cut-off part 237, and an extending baton 256 provided to root 5 254's rear end and having a keeping protrusion 257 at its rear end and a spring 258 provided to a part of extending baton 256's outer surface.

FIG. 16 is a perspective view of FIG. 9. As shown in FIG. 1 16, blade-shaped outgoing and incoming operating body 260 includes a vertical plate 261 and a horizontal plate 262 extending from vertical plate 261's end. More specifically, 10 vertical plate 262 has extending baton insertion races 264 and 263 formed at given left and right points and receiving left and right extending batons, and an extending baton moving race 265 laterally communicating with left extending baton insertion race 264.

Reference numerals 266 and 267 denote a jaw catching the pulling lug and a 15 pulling lug pass-through race through which the pulling lug is moved.

FIG. 11 is a cross-sectional view of the electric plug with round-shaped contacts protruding and being fixed according to the second embodiment of the present invention, and FIG. 12 is a longitudinal sectional view as taken along line of FIG.

11's B-B.

FIG. 15 is a perspective view showing the relation of a contact receiver's contact through hole and the round-shaped contacts protruding from the electric plug of the second preferred embodiment of the present invention.

5 As shown in FIGS. 11,12 and 15, round-shaped contact 230 includes a round-shaped contacting portion 231 contacting while being inserted into a socket, a tapered portion 232 having a diameter larger from the rear end of round-shaped contacting portion 231 by a given length to prevent the rest of round-shaped contact 230 from being removed from contact receiver 210 when protruding round-shaped 10 contacting portion 231, a round-shaped hollow cylindrical body 233 provided to the rear end of tapered portion 232 and having a central cut-off portion so as to receive and move blade-shaped contact 250 in the hollow center, a spring 238 extending from round-shaped cylindrical body 233 and elongated when removing an external force to push round-shaped contacting portion 231 out of contact receiver 210, and a 15 spring supporting portion 234 supporting spring 238.

Round-shaped contacting portion 21 has front ends with a schematically semicircular section cross divided and facing each other when viewed from the front.

Position set races 235 and 236 are each formed to a given depth on the outer surface of cylindrical body 233's front end and rear end to fix round-shaped contact 230 on its protruding (moving-forward) and received (moving-back) position by mutually acting with position set pins 215 each provided in contact receivers 210.

As shown in FIG. 14, a portion without race 233a is formed to a depth of 5 each of position set races 236 and 235 on a part of the outer surface between moving- forward position set race 236 and moving-backward position set race 235. This round-shaped contact 230 goes out and comes in receiver 210 while it is turned to let non-race 233a mate with a portion with race 233b (used as a relative concept with respect to portion without race 233a mate with position set pin 215, and fixed. A race 10 239 is formed on the outer surface of moving-forward position set race 236's rear part to receive keeper 271's upper end.

FIG. 17 is a perspective view of round-shaped outgoing and incoming operating body. As depicted in FIG. 17, round-shaped outgoing and incoming operating body 270 includes a latch insertion groove 272 formed across its front end 15 and receiving keeper 271's lower end, and a pulling lug pass-through groove 277 formed lengthwise to pass pulling lug. Reference numeral 276 denotes a jaw catching the pulling lug.

FIG. 17 is a perspective view of a contact selecting member of FIG. 12.

As depicted in FIG. 21, a guide hole 204 is provided to the front of case 200 to control an interval of the left contact.

Respective outgoing and incoming allowance holes 212 of left and right contact receivers 210 are formed to be in symmetry on the basis of a vertical shaft so 5 that blade-shaped contacts 250a and 250b are in a shape of \/. In the second preferred embodiment of the present invention, the angle of blade-shaped contact 250 can be fixed to be the same as that of the first preferred embodiment of FIG. 8, as indicated by the solid line, one-dotted chain line and two-dotted chain line.

The following description concerns the operation of the electric plug 10 according to the second preferred embodiment of the present invention.

As shown in FIGS. 9 and 10, in order to put blade-shaped contacts 250 in contact receivers 210 and protrude round-shaped contacts 230 at the same time while blade-shaped contacts 250 are being protruded, a user has to hold each blade-shaped contacting portion 251 of blade-shaped contacts 250 with the hand and turn it to 15 position each contacting portion 251 in respective outgoing and incoming allowance races 212, as indicated by the dotted line in FIG. 20. Subsequently, the use has to turn pulling lug 281 as indicated by the dotted line in FIG. 10 by manipulating 282 so as to mate pulling lug 281 with jaw 266 of blade-shaped contact outgoing and incoming operating body 260. After that, as feed lever 290 is moved back, pulling lug 281 connected to lever 290 mates with jaw 266 thereby moving blade-shaped contacts 250 back.

The front end of blade-shaped contacting portion 251 is received in central 5 cut-off part 237, and simultaneously, the pressure applied to left and right round- shaped contacts 230 by blade-shaped contacts 250 is instantaneously removed. Thus, round-shaped contacts 250 are moved forward to the outside of contact receivers 210 by spring 238's tensile force, clinging round-shaped contact outgoing and incoming operating body 270, and position set pin 215 faces to round-shaped cylindrical body 10 233's portion without race 233a. If the user turns round-shaped contacts 230 with the hand to make round-shaped cylindrical body 233's portion with race 233b face to position set pin 215, round-shaped contacts 230 are fixed not to be moved back, as depicted in FIGS. 11 and 12.

In order to protrude blade-shaped contacts 250 simultaneously with inserting 15 round-shaped contacts 230 in respective contact receivers 210, the user has to turn round-shaped contacting portions 231 of respective round-shaped contacts 230.

The user then turns pulling lug 281 as indicated by the dotted line in FIG. 11 by knob 282 so as to let pulling lug 281 mate with jaw 276 of round-shaped contact outgoing and incoming operating body 270 while feed lever 290 is being fully moved forward. After that, as feed lever 290 is moved back, jaw 276 mates with pulling lug 281 connected with lever 290 thereby moving round-shaped contact outgoing and incoming operating body 270 back. The pressing force, applied to blade-shaped 5 contacts 250 by round-shaped contacts 230, is removed at the point of inserting the front ends of round-shaped contacting portions 231 into rims 213 of respective receivers 210 so the blade-shaped contacts 250 are moved forward to the outside of receivers 210 by spring 258's tensile force, clinging blade-shaped contact outgoing and incoming operating body 260.

10 Both the ends of respective blade-shaped contacting portions 251 come to face respective outgoing and incoming allowance holes 212, as indicated by the dotted line in FIG. 21. As a user turns each blade-shaped contact 250 with the hand to let position set race 255 of each blade-shaped contact 250 mate with rims 213, as shown in FIG. 21, while blade-shaped contacting portions 251 of respective blade- 15 shaped contacts 250 are being completely protruded, blade-shaped contacts 250 are fixed not to be moved back, thus returning to the state of FIGS. 9 and 10.

When positioning the angle of blade-shaped contacts 250 as indicated by the one-dotted chain line and two-dotted chain line in the drawings, blade-shaped contacts 250 can be operated as described above. Round-shaped contacts 230 and blade-shaped contacts 250 of the above-described construction can be constructed by assembling components properly separated from each other as in the first preferred embodiment of the present invention.

5 The electric plug of the present invention being directly connected to the lead of electrical appliances can be sold.

For example, the present invention can be embodied just with blade-shaped contacts and by controlling the angle of turning. In addition, the present invention may be embodied with round-shaped contacts only and by controlling an interval 10 between the contacts.

As described above, the present invention encompasses an electric plug having a case, contact receivers held in the case, blade-shaped contacts and round- shaped contacts respectively provided to contact receivers and alternately coming in and going out of the receivers. The blade-shaped contacts can be turned by a given 15 angle while being protruded, and the terminal's shapes can be various by the angle of turning of the blade-shaped contacts and by either the blade-shaped contacts' coming-in and going-out or the round-shaped contacts'coming-in and going-out so that domestic electrical appliances can be used in foreign countries without regard to

the shape of plugs. In addition, the inventive plug is simple in construction, which makes it easy to use and enhances the production yield and decreases the production costs due to the reduction in volume.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.