Slide rail assembly

1. A slide rail assembly, comprising:

a first rail arranged with an engaging part;

a second rail movable relative to the first rail;

a slide assisting device movably mounted between the first rail and the second rail, wherein the slide assisting device comprises a main body, a plurality of slide assisting members and a fastening member, the plurality of slide assisting members are arranged on the main body and configured to rollingly contact the first rail and the second rail, and the fastening member is movably mounted to the main body;

a blocking member movably arranged on the first rail;

an elastic member configured to provide an elastic force to the blocking member; and

a first working member movably mounted to the second rail;

wherein the second rail is movable relative to the first rail from a retracted position to an extension position along a first direction;

wherein when the second rail is moved from the extension position along the first direction, the slide assisting device is configured to be engaged with the engaging part of the first rail through the fastening member being in a predetermined state; and

wherein when the second rail is located at the extension position relative to the first rail, the second rail is blocked by the blocking member through the first working member being in a first working state, in order to prevent the second rail from being moved along the first direction.

2. The slide rail assembly of claim 1 , further comprising an elastic feature configured to provide an elastic force to the fastening member in order to hold the fastening member in the predetermined state.

3. The slide rail assembly of claim 1 , wherein the fastening member is pivoted to the main body of the slide assisting device.

4. The slide rail assembly of claim 1 , wherein after the second rail is moved from the extension position along the first direction to be detached from the first rail, the second rail is configured to drive the fastening member to detach from the engaging part of the first rail through a guiding feature during a process of the second rail being moved along a second direction opposite to the first direction to be mounted into the first rail.

5. The slide rail assembly of claim 1 , wherein the first working member is pivoted to the second rail.

6. The slide rail assembly of claim 5 , further comprising a second working member movably mounted to the second rail; wherein when the second rail is located at the extension position, the second rail is blocked by the blocking member through the second working member being in the first working state, in order to prevent the second rail from being moved along a second direction opposite to the first direction.

7. The slide rail assembly of claim 6 , wherein the second working member is pivoted to the second rail.

8. The slide rail assembly of claim 7 , further comprising a first elastic part and a second elastic part configured to provide elastic forces to the first working member and the second working member respectively in order to hold the first working member and the second working member in the first working state.

9. The slide rail assembly of claim 8 , further comprising a first operating member and a second operating member configured to be operated to respectively switch the first working member and the second working member from the first working state to a second working state.

10. The slide rail assembly of claim 1 , further comprising a third rail, wherein the first rail is movably mounted between the third rail and the second rail.

11. The slide rail assembly of claim 10 , further comprising a slide assisting kit movably mounted between the third rail and the first rail.

12. The slide rail assembly of claim 11 , wherein the slide assisting kit comprises a plurality of slide assisting members rollingly contacting the third rail and the first rail.

13. A slide rail assembly, comprising:

a first rail arranged with an engaging part;

a second rail movable relative to the first rail;

a third rail, wherein the first rail is movably mounted between the third rail and the second rail; and

a slide assisting device movably mounted between the first rail and the second rail, wherein the slide assisting device comprises a main body a plurality of slide assisting members and a fastening member, the plurality of slide assisting members are arranged on the main body and configured to rollingly contact the first rail and the second rail, and the fastening member is movably mounted to the main body;

wherein the second rail is movable relative to the first rail from a retracted position to an extension position along a first direction;

wherein when the second rail is moved from the extension position along the first direction, the slide assisting device is configured to be engaged with the engaging part of the first rail through the fastening member being in a predetermined state; and

wherein the third rail is arranged with a functional member, and the first rail is arranged with a synchronization member; wherein when the second rail is moved relative to the first rail from the retracted position along the first direction, the second rail is configured to drive the first rail to synchronously move along the first direction through the synchronization member; wherein a guiding structure of the functional member is configured to move the synchronization member to allow the first rail to be no longer synchronously moved with the second rail when the second rail is moved a predetermined distance from the retracted position along the first direction.

14. The slide rail assembly of claim 13 , wherein the synchronization member is made of a flexible material.

15. The slide rail assembly of claim 14 , wherein the functional member comprises a positioning part, and the synchronization member comprises an engaging section elastically extended toward the third rail; wherein when the first rail is moved relative to the third rail along the first direction to an open position, the first rail is configured to be engaged with the positioning part of the functional member through the engaging section of the synchronization member, in order to hold the first rail at the open position.

16. The slide rail assembly of claim 14 , wherein the synchronization member is pivoted to the first rail.

17. The slide rail assembly of claim 16 , wherein the synchronization member comprises an elastic leg abutting against the first rail.