Rotating assembly and universal ball joint assembly

1. A rotating assembly, adapted to be assembled on a foot stand, wherein the rotating assembly comprises:

a limit ring, adapted to be fixed on the foot stand;

a base, assembled on the limit ring and capable of moving along an axis, wherein the base and the limit ring form a space;

a spherical friction part, rotatably disposed in the space between the limit ring and the base; and

a pressing module, adapted to be fixed on the foot stand, wherein the pressing module is assembled on one side of the base along the axis, and pushes the base to a direction towards the limit ring to compress the space formed by the base and the limit ring so the spherical friction part is in contact with the limit ring and the base to generate friction, and the spherical friction part is temporarily maintained at a specific angle due to the friction between the spherical friction part and the limit ring and the friction between the spherical friction part and the base,

wherein the pressing module comprises:

a pressing part, adapted to be fixed on the foot stand, wherein the base is located between the pressing part and the spherical friction part; and

an elastic part, disposed between the base and the pressing part,

wherein the foot stand comprises a tube body and a plurality of first engaging portions protruding from an inner wall of the tube body, there is a plurality of notches among the first engaging portions, the pressing part further comprises a baseplate and a plurality of second engaging portions disposed on a part of an outer edge of the baseplate, and the pressing part is adapted to be limited by the first engaging portions after the second engaging portions pass through the notches and then rotates an angle to align the second engaging portions with the first engaging portions, and therefore to be fixed on the foot stand.

2. The rotating assembly according to claim 1 , wherein the second engaging portions protrude from the baseplate and the elastic part is located in a space formed by the baseplate and the second engaging portions.

3. The rotating assembly according to claim 1 , wherein the pressing part has an external thread, the foot stand has an internal thread corresponding to the external thread, and the pressing part is adjustably fixed on the foot stand.

4. The rotating assembly according to claim 1 , further comprising:

an assembly part, fixed on the spherical friction part and going through the limit ring.

5. The rotating assembly according to claim 1 , wherein the spherical friction part comprises a sphere head and a contact layer wrapping the sphere head, and the contact layer is in contact with the limit ring and the base.

6. The rotating assembly according to claim 5 , wherein the contact layer comprises a plurality of ribs or a plurality of bumps that protrudes from an outer surface of the contact layer and is uniformly distributed.

7. A universal ball joint assembly, adapted to assemble with an object, comprising:

a foot stand, and

a rotating assembly according to claim 1 , wherein the limit ring and the pressing module are fixed on the foot stand.

8. The universal ball joint assembly according to claim 7 , wherein the foot stand comprises a lower pedestal, an upper pedestal, a first magnetic piece, and a second magnetic piece corresponding to the first magnetic piece, the first magnetic piece is disposed on the upper pedestal, the second magnetic piece is disposed on the lower pedestal, and the upper pedestal is detachably assembled on the lower pedestal by the first magnetic piece and the second magnetic piece.

9. The universal ball joint assembly according to claim 7 , wherein the foot stand comprises a lower pedestal and an upper pedestal, the lower pedestal comprises a first fastening portion, the upper pedestal comprises a second fastening portion corresponding to the first fastening portion, and the upper pedestal is detachably assembled on the lower pedestal by the first fastening portion and the second fastening portion.