Socket with rotatable socket core

1. A socket with rotatable socket core comprising:

a cover;

a base plate;

an electrode bracket disposed in between the cover and the base plate, wherein the cover, the electrode bracket and the base plate each has at least one opening which corresponds to each other longitudinally and concentrically, and the inner circumferential surfaces of the concentric openings of the electrode bracket are provided with electrically conductive members positioned separately and longitudinally, and the electrically conductive members are connected to electricity supply members which can be electrically connected to an outside electricity source;

at least one socket core that is rotatable in one full circle which is disposed inside the concentric openings of the base, the electrode bracket and the plate, wherein a plurality of apertures is disposed longitudinally inside the socket core, and a plurality of electrically conductive springs is provided inside each of the apertures, and a side portion of each of the electrically conductive springs diverges longitudinally and protrudes outwards from the outer circumferential surface of the socket core, and maintains contacts with one of the electrically conductive members correspondingly when the socket core is rotating in 360°.

2. The socket with rotatable socket core as in claim 1 , wherein the electrode bracket is divided into layers and stacked together to form one piece.

3. The socket with rotatable socket core as in claim 1 , wherein the electrically conductive members are electrically conductive rings disposed on the inner surfaces of the openings of the electrode bracket.

4. The socket with rotatable socket core as in claim 3 , wherein the socket core comprises a core pillar with ascending steps on its outer circumferential surface, a base cover with descending steps on its outer circumference which engage with the ascending steps of the core pillar, and the protruding side portions of the electrically conductive springs are connected to where the steps of the core pillar and the base cover engage with one another respectively.

5. The socket with rotatable socket core as in claim 1 , wherein the electrically conductive members are electrically conductive contacts which are disposed on the inner circumferential surfaces of the openings of the electrode bracket, and the protruding side portions of the electrically conductive soririgs of the socket core form a ring which surrounds the outer circumferential surface of the socket core and contacts the electrically conductive contacts in a sliding manner.

6. The socket with rotatable socket core as in claim 1 , wherein the bottom end of the socket core is provided with a shifting wheel; the base plate is provided with a fixation mechanism; and the fixation mechanism comprises one or more fixation members which engages with the shifting wheel and a release spring which abuts against the fixation member.

7. The socket with rotatable socket core as in any of claims 1 to 5 , wherein it also comprises a housing enclosing the assembly formed by the cover, the base plate and the electrode bracket; the top surface of the housing has at least one opening and its bottom surface is open; the base plate and the opening surface of the housing engage and are tightly assembled together; and the electricity supply members are standard socket pins electrically connecting to the electrically conductive members and protruding from the base plate.

8. The socket with rotatable socket core as in claim 1 , wherein a ratchet wheel is disposed at the bottom end of the socket core and a ratchet pawl which engages with the ratchet wheel is disposed in the base plate.