Bracket structure

1. A bracket structure, comprising:

a base, comprising a base body, a first connection protrusion and a second connection protrusion, wherein the first connection protrusion and the second connection protrusion are affixed to the base body, the first connection protrusion comprises a first contact surface, the second connection protrusion comprises a second contact surface, and the first contact surface faces the second contact surface;

a connection pipe, wherein the connection pipe comprises an extending section, a fitting section and a pivot section, and the fitting section is located between the pivot section and the extending section, wherein the pivot section and the fitting section are located on different portions of the connection pipe;

at least one cascade member, pivoting on the first connection protrusion, the pivot section and the second connection protrusion, wherein the pivot section comprises a first abutting surface and a second abutting surface, the first abutting surface is opposite the second abutting surface, the first abutting surface forms a surface-to-surface contact with the first contact surface, and the second abutting surface forms a surface-to-surface contact with the second contact surface,

wherein the first connection protrusion comprises a first affixed end and a first free end, the second connection protrusion comprises a second affixed end and a second free end, the first affixed end and the second affixed end are affixed to the base body, and the first free end and the second free end are adapted to abut the fitting section,

wherein the fitting section is adapted to tightly fit the first free end and the second free end simultaneously, the pivot section comprises a pivot section diameter between the first abutting surface and the second abutting surface, the fitting section comprises a fitting section diameter, and the fitting section diameter is greater than the pivot section diameter,

wherein a first gap is formed between the first contact surface and the second contact surface, a second gap is formed between the first free end and the second free end, and the second gap is greater than the first gap.

2. The bracket structure as claimed in claim 1 , wherein a cross section of the extending section is oval or circular.

3. The bracket structure as claimed in claim 2 , wherein the first abutting surface, the second abutting surface, the first contact surface and the second contact surface are planar surfaces.

4. The bracket structure as claimed in claim 1 , further comprising an elastic element, a first positioning member and a second positioning member, the first positioning member comprises a plurality of first teeth, the second positioning member comprises a plurality of second teeth, the elastic element is sandwiched between the first positioning member and the second positioning member, the first positioning member is affixed to the base, the second positioning member is affixed to the connection pipe, wherein in a fastening state, the cascade member provides a fastening force to the first connection protrusion and the second connection protrusion, and each first tooth is wedged to a second tooth, wherein in an adjustment state, the fastening force of the cascade member is released, the elastic element separates the first teeth from the second teeth, and the first positioning member is adapted to be rotated relative to the second positioning member.

5. The bracket structure as claimed in claim 4 , wherein the first positioning member comprises a first positioning post, the base body comprises a positioning slot, and the first positioning post is inserted into the positioning slot.

6. The bracket structure as claimed in claim 4 , wherein the second positioning member comprises a second positioning post, the second positioning post is inserted into the connection pipe, and the second positioning post extends in a diametric direction of the connection pipe.

7. The bracket structure as claimed in claim 1 , wherein the connection pipe is integrally formed.

8. The bracket structure as claimed in claim 7 , wherein the fitting section and the pivot section are formed by punching, and the fitting section diameter of the fitting section is greater than an extending section diameter of the extending section.

9. The bracket structure as claimed in claim 1 , wherein the pivot section and the fitting section constitute a tapered cross section.

10. A wireless transmission apparatus, comprising:

a wireless transmission device; and

a bracket structure, comprising:

a base, comprising a base body, a first connection protrusion and a second connection protrusion, wherein the first connection protrusion and the second connection protrusion are affixed to the base body, the first connection protrusion comprises a first contact surface, the second connection protrusion comprises a second contact surface, and the first contact surface faces the second contact surface;

a connection pipe, wherein the connection pipe comprises an extending section, a fitting section and a pivot section, and the fitting section is located between the pivot section and the extending section, wherein the wireless transmission device is connected to the extending section, wherein the pivot section and the fitting section are located on different portions of the connection pipe;

at least one cascade member, pivoting on the first connection protrusion, the pivot section and the second connection protrusion, wherein the pivot section comprises a first abutting surface and a second abutting surface, the first abutting surface is opposite the second abutting surface, the first abutting surface forms a surface-to-surface contact with the first contact surface, and the second abutting surface forms a surface-to-surface contact with the second contact surface,

wherein the first connection protrusion comprises a first affixed end and a first free end, the second connection protrusion comprises a second affixed end and a second free end, the first affixed end and the second affixed end are affixed to the base body, and the first free end and the second free end are adapted to abut the fitting section,

wherein the fitting section is adapted to tightly fit the first free end and the second free end simultaneously, the pivot section comprises a pivot section diameter between the first abutting surface and the second abutting surface, the fitting section comprises a fitting section diameter, and the fitting section diameter is greater than the pivot section diameter,

wherein a first gap is formed between the first contact surface and the second contact surface, a second gap is formed between the first free end and the second free end, and the second gap is greater than the first gap.

11. The wireless transmission apparatus as claimed in claim 10 , wherein a cross section of the extending section is oval or circular.

12. The wireless transmission apparatus as claimed in claim 11 , wherein the first abutting surface, the second abutting surface, the first contact surface and the second contact surface are planar surfaces.

13. The wireless transmission apparatus as claimed in claim 10 , wherein the bracket structure further comprises an elastic element, a first positioning member and a second positioning member, the first positioning member comprises a plurality of first teeth, the second positioning member comprises a plurality of second teeth, the elastic element is sandwiched between the first positioning member and the second positioning member, the first positioning member is affixed to the base, the second positioning member is affixed to the connection pipe, wherein in a fastening state, the cascade member provides a fastening force to the first connection protrusion and the second connection protrusion, and each first tooth is wedged to a second tooth, wherein in an adjustment state, the fastening force of the cascade member is released, the elastic element separates the first teeth from the second teeth, and the first positioning member is adapted to be rotated relative to the second positioning member.

14. The wireless transmission apparatus as claimed in claim 13 , wherein the first positioning member comprises a first positioning post, the base body comprises a positioning slot, and the first positioning post is inserted into the positioning slot, the second positioning member comprises a second positioning post, the second positioning post is inserted into the connection pipe, and the second positioning post extends in a diametric direction of the connection pipe.

15. A bracket structure, comprising:

a base, comprising a base body, a first connection protrusion and a second connection protrusion, wherein the first connection protrusion and the second connection protrusion are affixed to the base body, the first connection protrusion comprises a first contact surface, the second connection protrusion comprises a second contact surface, and the first contact surface faces the second contact surface;

a connection pipe, wherein the connection pipe comprises an extending section, a fitting section and a pivot section, and the fitting section is located between the pivot section and the extending section;

at least one cascade member, pivoting on the first connection protrusion, the pivot section and the second connection protrusion, wherein the pivot section comprises a first abutting surface and a second abutting surface, the first abutting surface is opposite the second abutting surface, the first abutting surface forms a surface-to-surface contact with the first contact surface, and the second abutting surface forms a surface-to-surface contact with the second contact surface, wherein the first connection protrusion comprises a first affixed end and a first free end, the second connection protrusion comprises a second affixed end and a second free end, the first affixed end and the second affixed end are affixed to the base body, and the first free end and the second free end are adapted to abut the fitting section, wherein the fitting section is adapted to tightly fit the first free end and the second free end simultaneously, the pivot section comprises a pivot section diameter between the first abutting surface and the second abutting surface, the fitting section comprises a fitting section diameter, and the fitting section diameter is greater than the pivot section diameter;

an elastic element;

a first positioning member; and

a second positioning member, wherein the first positioning member comprises a plurality of first teeth, the second positioning member comprises a plurality of second teeth, the elastic element is sandwiched between the first positioning member and the second positioning member, the first positioning member is affixed to the base, the second positioning member is affixed to the connection pipe, wherein in a fastening state, the cascade member provides a fastening force to the first connection protrusion and the second connection protrusion, and each first tooth is wedged to a second tooth, wherein in an adjustment state, the fastening force of the cascade member is released, the elastic element separates the first teeth from the second teeth, and the first positioning member is adapted to be rotated relative to the second positioning member.