Strap assembly and fastening unit thereof

1. A fastening unit, comprising:

a base;

a fixing seat disposed on the base;

two shaft seats arranged side by side and disposed on the base in such a way that the two shaft seats are spaced apart from each other in a second direction, wherein each of the two shaft seats is spaced from the fixing seat along a first direction by a distance, and the first direction is perpendicular to the second direction;

a main body having two shafts in cylindrical shape respectively formed at two sides thereof, wherein each of the two shaft seats comprises a shaft hole and a guiding groove connecting the shaft hole, the two shafts are pivotably disposed on the two shaft holes of the two shaft seats, the guiding groove is formed at a side of the shaft seat that is away from the fixing seat;

an engaging member connected to a side of the main body that is away from the two shaft seats; and

an abutting member projecting from a bottom surface of the main body;

wherein when the fastening unit is in a closed state, the engaging member engages with the fixing seat, and the bottom surface faces the base such that the abutting member is adjacent to the base, and the two shafts of the main body are capable of being released from the two shaft seats in the first direction via the guiding groove when an external force is applied in the closed state; and

when the fastening unit is transferred from the closed state to an opened state, the engaging member disengages from the fixing seat, and the main body pivots relative to the two shaft seats.

2. The fastening unit as claimed in claim 1 , wherein the engaging member comprises:

an elastic compression portion connected to the main body; and

an engaging portion connected to the main body via the elastic compression portion and configured to engage with the fixing seat;

wherein when the fastening unit is transferred from the closed state to an opened state, the elastic compression portion is deformed so as to facilitate the disengagement of the elastic compression portion from the fixing seat.

3. The fastening unit as claimed in claim 2 , wherein the elastic compression portion comprises an extending segment enabling the engaging portion to have a degree of freedom along the first direction and/or a degree of freedom in a third direction perpendicular to the first and second directions.

4. The fastening unit as claimed in claim 3 , wherein the elastic compression portion further comprises a flexible segment connecting the extending segment to the engaging portion and enabling the engaging portion to have a degree of freedom along the first direction.

5. The fastening unit as claimed in claim 1 , wherein a channel penetrates the fixing seat along the first direction, and the channel enables a strap to pass therethrough.

6. The fastening unit as claimed in claim 5 , wherein a through hole is formed on the fixing seat at a side of the channel that is away from the base, and when the fastening unit is in the closed state, the engaging member is connected to the fixing seat via the through hole.

7. The fastening unit as claimed in claim 1 , wherein a through passage is formed at a side of the main body that is opposite to a side of the main body at which the engaging member is connected, and the through passage is configured to facilitate a strap passing therethrough.

8. A fastening unit, comprising:

a fastening unit as claimed in claim 1 , wherein a through passage is formed at a side of the main body that is opposite to a side of the main body at which the engaging member is connected, and a channel is arranged passing through the fixing seat along the first direction; and

a strap, wherein a first end of the strap is fixed on the through passage, and a second end of the strap passes through the channel and the interspace between the two shaft seats in order;

wherein when the fastening unit is in the closed state, the second end of the strap is abutted by the abutting member so as to position the strap on the base.