Abstract:
A universal adapter including two electrically conductive pins which are electrically connected with an output socket of an adapter body, in which the pins are releasably engageable with an oblong ring for insertion into holes of a wall socket in order to establish electrical contact with the wall socket, in which the pins are movable relative to the ring when the pins are engaged with the ring in order to vary the distance and/or orientation between the pins.

Description:
This invention relates to a universal adapter and, in particular, such an adapter which can be used in various countries in the world in which the wall sockets are differently structured. 
     BACKGROUND OF THE INVENTION 
     There are now various portable electrical appliances which can be operated by the user during travelling in other countries. Such appliances may include portable computers, mobile phones and facsimile machines. In order to adapt to the differences in the voltage of municipal power supply, many such products are installed with built-in voltage converter, which allows the user to step up or step down the voltage of municipal power supply, as desired. 
     Another problem associated with the use of such appliances in various countries is that the shape and arrangement of the holes in wall sockets may vary from country to country. There are now four types of wall-socket arrangements in the world. In Great Britain, Hong Kong, Singapore, etc., the wall sockets are of BS type, and include three rectangular holes. In such countries as the US, Canada, Japan and Taiwan, the wall sockets are of UL type, and include two flat holes. In other European countries, the wall sockets are of VDE type, and include two round holes. In Australia and New Zealand, the wall sockets are of SAA type, and include two inclined flat holes. 
     DESCRIPTION OF THE PRIOR ART 
     In view of the above situation, various electrical adapters have been devised for allowing the many electrical appliances to be used around the world. For example, U.S. Pat. Nos. 4,579,410, 4,978,318, 5,159,545 and 5,716,219, Japanese Patent Publication Nos. 02253578A, 07296898A, 09147959A, and Chinese Patent Publication Nos. 87207492U, 1053147A, 2078049U, 2132295Y and 2271046Y disclose various plugs and adapters which may be used in conjunction with more than one type of wall socket. However, most such adapters are very bulky, at least when compared with conventional electric plugs or sockets. In additional, a relative high amount of metal is required for making the components in such adapters, which add to the manufacturing cost. 
     It is thus an object of the present invention to provide a universal adapter in which the aforesaid shortcomings are mitigated, or at least to provide a useful alternative to the public. 
     SUMMARY OF THE INVENTION 
     According to the present invention, there is provided a universal adapter comprising at least two electrically conductive pin members electrically connected with output socket means of a body member, wherein said pin members are releasably engageable with coupling means for insertion into holes of a wall socket for establishing electrical contact therewith, characterized in that said pin members are movable relative to said coupling means when said pin members are engaged therewith. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A preferred embodiment of the present invention will be described by way of an example, and with reference to the accompanying drawings: 
     FIG. 1 is a front perspective view of a universal adapter according to the present invention; 
     FIG. 2 is a rear perspective view of the adapter shown in FIG. 1; 
     FIG. 3 is a further rear perspective view of the adapter shown in FIG. 1; 
     FIG. 4 is a perspective view of the body member of the adapter shown in FIG. 1 in an open position; 
     FIG. 5A is a front view of the body member shown in FIG. 4; 
     FIG. 5B is a front view of the body member shown in FIG. 4 in a closed position; 
     FIG. 5C is an underneath view of the body member shown in FIG. 5B; 
     FIG. 6A is a top view of the body member shown in FIG. 4; 
     FIG. 6B is a cross-sectional view of the body member shown in FIG. 4 taken along the line I--I; 
     FIG. 6C is a cross-sectional view of the body member shown in FIG. 4 taken along the line II--II; 
     FIG. 6D is a cross-sectional view of the body member shown in FIG. 4 taken along the line III--III; 
     FIG. 7 is a further perspective view of the body member of the adapter shown in FIG. 1 in the open position; 
     FIG. 8 is a perspective view of the body member of the adapter shown in FIG. 1 in the open position, showing the connection between the pin member and the socket; 
     FIG. 9 shows in more detail the connection between the pin member and the socket shown in FIG. 8; 
     FIG. 10A shows a partial top view of the adapter shown in FIG. 1 in which the body member is in the open position; 
     FIG. 10B is a sectional view of the adapter shown in FIG. 10A in which the body member is in the closed position; 
     FIG. 11A shows engagement between the pin members and the coupling means; 
     FIG. 11B shows a sectional view taken along the line IV--IV in FIG. 11A; 
     FIG. 11C is a side view of the pin members and coupling means shown in FIG. 11A; 
     FIG. 11D shows a sectional view taken along the line V--V in FIG. 11C; 
     FIG. 12A shows a front view of the coupling means; 
     FIG. 12B shows a sectional view of the coupling means shown in FIG. 12A taken along the line VI--VI; 
     FIGS. 13A and 13B show engagement of the pin members with a first type of adapting pin, in which FIG. 13B is a sectional view taken along the line VII--VII in FIG. 13A; 
     FIGS. 14A and 14B show engagement of the pin members with a second type of adapting pin, in which FIG. 14B is a sectional view taken along the line VIII--VIII in FIG. 14A; 
     FIG. 15A shows a front view of an earth-hole opener; 
     FIG. 15B shows a side view of the earth-hole opener shown in FIG. 15A; and 
     FIGS. 16A to 16C show orientation of the pin members for insertion into a further kind of socket holes, in which FIG. 16C is a sectional view taken along the line IX--IX in FIG. 16A. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As shown in FIGS. 1 and 2, a universal adapter according to the present invention is shown and designated as 10. The adapter 10 includes a body 12 with a top 14 and a base 16. The top 14 and the base 16 are swivellable relative to each other about two hinges 18, so that they may be closed (e.g. as shown in FIGS. 1 and 2) or opened (e.g. as shown in FIG. 10A). Extending out from the interior of the body 12 are two electric wires 20, each electrically connected with an electrically conductive pin 22 which may be inserted into a hole of a socket. 
     Each pin 22 is fixedly secured to an engagement member 24 with a cube-like portion 26, a narrow cylindrical portion 28 and a frusto-conical portion 30. On the outer major surface 32 of the top 14 are two half-rings 34, each for receiving and engaging the narrow cylindrical portion 28 of a respective engagement member 24. As shown in FIG. 1, the engagement members 24 may be releasably coupled to an oblong ring 36 in a manner to be discussed below. When the engagement members 24 are disengaged from the oblong ring 36, they may be received by the two half-rings 34, as shown in FIG. 2. 
     As can be seen in FIGS. 2 and 3, the top 14 and the base 16, when closed, combine to form on an end 38 of the body 12 apertures 40a, 40b and 40c, thus forming a socket, adapted for receiving an electric plug 42 of an electrical appliance (not shown). As shown in FIGS. 4, 5A to 5C and 6A to 6D, the top 14 and the base 16, when open, reveal cavities which may be used for storing various component parts of the adapter 10. In particular, as shown in FIG. 7, the base 16 includes a recess 44a for receiving a metal socket clip 46a and metal platelet 48a assembly, and a recess 44b for receiving a metal socket clip 46b and metal platelet 48b assembly. The socket clip 46a, 46b and the respective platelet 48a, 48b are fixedly secured to each other, e.g. by welding or being formed integrally. When assembled, the plug 42 of the electrical appliance may be plugged into the apertures 40a, 40b, 40c for establishing electrical contact with the clips 46a, 46b. The base 16 also includes a recess 50 for receiving the oblong ring 36, a pair of a first type of adapting pins 52, a pair of a second type of adapting pins 54 and an earth pin 56. While the socket clips 46a, 46b and the platelets 48a, 48b are made of an electrically conductive metal, e.g. copper, the ring 36, the adapting pins 52, 54 and the earth pin 56 are all made of an electrically insulating material, e.g. plastics. 
     It can be seen from FIGS. 8 and 9 that while one end of the electric wire 20 leads to and is in electrical connection with the pin 22, another end of the electric wire 20 is connected with the platelet 48b, which is in contact with the socket clip 46b. By way of such an arrangement, when the pins 22 are inserted into holes of a wall socket, an electrical appliance whose plug 42 is plugged into the apertures 40a, 40b, 40c may obtain electric power from the wall socket. 
     FIGS. 10A and 10B show the way the ring 36, the adapting pins 52, 54 and the earth pin 56 are stored in the body 12. It can be seen that such provides a very neat, compact and easily portable adapter arrangement. The arrangement of the pins 22, the engagement members 24 and the ring 36 as shown in these two figures allow the pins 22 to be inserted into wall sockets of the UL type. 
     It can be seen in FIGS. 12A and 12B that the ring 36 includes a wider central hollow portion 58 and two narrower side hollow portions 60. The size of these hollow portions 58, 60 are such that while the cube-like portion 26 of the engagement member 24 can pass through the central hollow portion 58 but not the side hollow portions 60, the cylindrical portion 28 of the engagement member 24 is of a length l (see FIG. 8) of at least the thickness t of the ring 36 (see FIG. 12B). By way of such an arrangement, when the engagement member 24 is coupled to the ring 36, it can slide relative to the ring 36 in the direction of the arrows A, and can also rotate along its own longitudinal axis. It can thus be seen that it is possible to adjust the distance d between the two pins 22 (see FIG. 11A). 
     In order to enable the adapter 10 to be plugged into wall sockets of the VDE type, the first type of adapting pins 52 may be engaged with the pin 22 and the cube-like portion 26 of the engagement member 24, as shown in FIGS. 13A and 13B. It can be seen from FIG. 7 that the adapting pin 52 includes a substantially cylindrical part 62 for insertion into a hole of the wall socket and a clip part 64 for engaging the cube-like portion 26. The cylindrical part 62 includes a slit 66 through which the pin 22 extends, so that the pin 22 can be in contact with the electrically-conductive elements in the wall socket. 
     In order to enable the adapter 10 to be plugged into wall sockets of the BS type, the pin 22 may be engaged with the second type of adapting pins 54, as shown in FIGS. 14A and 14B. The adapting pin 54 includes an essentially rectangular prism 68 and a clip part 70. It can be seen in FIG. 14B that when the pin 22 is engaged with the adapting pin 54, a major surface of the pin 22 is exposed so that it may be in contact with the electrically-conductive elements in the wall socket. In this connection, an earth pin 56 is provided which may be used for insertion into the earth hole of the wall socket in order to enable the pins 22 to be inserted into the remaining holes. 
     In order to enable the adapter 10 to be plugged into wall sockets of the SAA type, the two engagement members 24 are rotated to the orientation as shown in FIGS. 16A to 16C.