Universal adapter

A universal adapter comprising:

• a casing comprised of a front cover and a rear cover;
• an input plug means having a plurality of plugs with different-shaped plug pins respectively slidably held in a plurality of grooves transversely juxtapositionally formed in an upper portion of said casing, each said plug operatively protruded frontwardly from said front cover of said casing to be plugged in a wall socket of a municipal utility power supply source;
• an output socket means having two sockets formed in said rear cover provided with two clips formed in a lower portion of said casing to be connected with two output plug pins of a user's electric appliance;
• an inner conducting means having two conducting plates respectively embedded in two opposite side portions in said casing respectively connecting two poles of the municipal power source through any two plug pins of one said plug of said input plug means having a conducting wire connected to a first clip of said output socket means;
• a converter stored in a middle portion of said casing selected from a transformer for stepping down or up a voltage of an input power source and a rectifier for rectifying an input power;
• and
• a selector switch means including a selecting knob rotatably mounted in a lower portion of said casing having a conducting lever secured with said selecting knob for selectively connecting a second clip of said output socket means through said converter or without being through said converter;
• said input plug means including:
• a first plug slidably engageable with a first groove formed in the casing having a pair of first plug pins generally formed as round pins operatively protruding frontwardly adapted for plugging in two round holes of a wall socket of a municipal power supply, a first block member formed on a rear portion of the first plug made of electrical insulative material operatively depressed by a user's finger to protrude the first plug pins frontwardly to be limited by two limiting extensions formed on a front plate of the front cover and disposed at two opposite end portions of the first groove, two first metallic protrusions disposed on two opposite side portions of the first block member electrically conducting the two first pins and operatively contacting a first and a second conducting plates of the inner conducting means embedded in two opposite end portions in the front cover of the casing, and two wedge snap members protruding frontwardly from the first block member and formed in between the two first plug pins to be expandibly retained on the front plate beyond the first groove when depressing the first plug frontwardly for plugging the first plug in a wall socket;
• a second plug including:
• a pair of second plug pins generally formed as rectangular pins and a second block member formed on a rear portion of the second plug made of insulative material slidably held in a second groove in said casing operatively depressed to protrude the second plug pins frontwardly through two pin holes formed in the front plate of the front cover to allow the second block member to be limited by the front plate, two second metallic protrusions disposed on two opposite side portions of the second block member electrically conducting the two second pins and operatively contacting the first and second conducting plates of the inner conducting means, two side extensions formed on two opposite side portions of the second plug operatively limited by a stopper protrusion of a locking member slidably held in a vertical slot formed in a side portion of the casing for stably extending the second pins frontwardly for electrical plugging operation, and a grounding plug pin which is made of electrical insulative material and made as a rectangular shape slidably held in an uppermost groove formed in the casing in cooperation with the two second plug pins to form triple pins adapted to be plugged in triple rectangular holes of a wall socket;
• and
• a third plug slidably engageable with a third groove formed in the casing including:
• a pair of third plug pins generally formed as flat blades operatively protruding frontwardly adapted to be plugged in two flat holes in a wall socket, a third block member formed on a rear portion of the third plug made of insulative material operatively protruded frontwardly through two pin holes formed in the front plate, two third metallic protrusions disposed on two opposite side portions of the third block member electrically conducting the two third pins and operatively contacting the two conducting plates of the inner conducting means, and a circumferential extension circumferentially formed on the third block member operatively limited by a stopper protrusion of a locking member slidably held in the casing for stably extending the third pins frontwardly for power connection.