Charger with a replaceable electrical plug

Claim 1

A charger comprising: a replaceable electrical plug, a casing (1) including a lower casing (11) and an upper casing (12), said casing (1) accommodating therein an electronic power supply circuit (13) for lowering the voltage of direct currents and converting the voltage of alternating currents, said casing (1) being adopted for use with a plurality of replaceable electrical plugs (14) to match different specifications of electrical sockets, said casing (1) further having a cigarette lighter plug (15) pivotally disposed thereon for obtaining the electric power of a car by fitting said cigarette lighter plug (15) into the car's cigarette lighter socket, wherein said lower casing (11) is provided with an opening (111) at a suitable position, a projecting seat (112) at a rear edge inside the opening (111), said projecting seat (112) being provided with a rectangular hole (1121) thereon, a slide groove (114) being provided inside said lower casing (11) to the rear of said projecting seat (112), said slide groove (114) being provided with an elongated slot (1141) therein and a stop block (1142) to the rear thereof, a movable fastening piece (115) and a positioning slide piece (116) being mounted above said slide groove (114), said movable fastening piece (115) having an elongated hole (1151) and said positioning slide piece (116) having a circular hole (1161), said movable fastening piece (115) being inserted into said rectangular hole (1121) of said projecting seat (1112), a curved pivot seat (113) being disposed at either end of a front edge inside said opening (111), an inner casing (16) being secured inside said lower casing (11) corresponding to said opening (111), two slots (161) being provided on the surface of the front end of said inner casing (16), and a fastening seat (163) with a fastening hole (1631) being disposed at the middle of the rear end of said inner casing (16); a slide seat (17) is fitted inside said inner casing (16) of said lower casing (11) such that it may reciprocate therein, an elastic fastening piece (172) being disposed at the middle of the rear end of said slide seat (17), and having a protrudent block (1721) thereon and a circular rod (1722) fitted thereon, said circular rod (1722) being inserted into said elongated hole (1151) of said movable fastening piece (115) and said circular hole (1161) of said positioning slide piece (116), as well as said elongated slot (1141) of said lower casing (11), such that, by means of pushing said circular rod (1722) inwardly to press said slide seat (17), said protrudent block (1721) of said elastic fastening piece (172) may disengage said fastening hole (1631) of said inner casing (16), motion of said slide seat (17) causing said movable fastening piece (115) to project outwardly to retract with the movement of said slide seat (17); either lateral side of the front end of said slide seat (17) being provided with a half pivot seat (173) which forms a pivot hole (110) with said curved pivot seat (113) of said lower casing (11) and said curved notch (162) of said inner casing (16); two electrically conductive pieces (18) dispose at the bottom of said inner casing (16), each of which having a bent portion (181) at the front end for matching said slot (161) of said inner casing (16), the rear end thereof being connected to said electronic power supply circuit (13); said replaceable electric plug (14) includes a plastic plug body (141) with a plurality of electrically conductive legs (142) for matching an electric socket, both sides of the rear end of said plug body (141) being respectively provided with a protrudent pivot (141) which may fit into the pivot hole (110) formed by said half pivot seat (173) of said slide seat (17), said curved pivot seat (113) of said lower casing (11) and said curved notch (162) of said inner casing (16), said legs (142) extending rearwardly to have two contact terminals (144) projecting from the rear edge of said plug body (141) such that said contact terminals (144) may contact said bent portions (181) of said two conductive pieces (18) when said electrical plug (14) is turned outwardly after assembly; and said upper casing (12) is provided with a tubular recess (121) at a suitable position, a pair of pivot seats (122) each having a pivot hole (123) being disposed below said recess, a plurality of elastic arms (124) being disposed in said recess (121) at suitable positions, each of said elastic arms having a boss (1241); and said cigarette lighter plug (15) is pivotally provided on said pivot seats (122), the bottom side of said cigarette lighter plug (15) being provided with a cylindrical element (151) having a short pivot (152) provided at either side thereof and a plurality of depressions (153) on its peripheral surface, said short pivots (152) capable of fitting into said pivot holes (123) of said pivot seats (122) so that said cigarette lighter plug (15) is pivotally mounted on said pivot seats (122) of said upper casing (12), and said bosses (1241) in said recess (121) may engage said depressions (153) of said cylindrical element (151).