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A tray includes a tray body, a handle, a first gear, a second gear, a linking member and a block member. The first gear is fixed on the handle and pivotally connected to the tray body. The second gear is pivotally connected to the tray body and has an engaging portion. The linking member is connecte

A tray includes a tray body, a handle, a first gear, a second gear, a linking member and a block member. The first gear is fixed on the handle and pivotally connected to the tray body. The second gear is pivotally connected to the tray body and has an engaging portion. The linking member is connected to the first gear and the second gear. The block member is fixed on the tray body and has a resilient portion. When the handle rotates with respect to the tray body to a predetermined angle in an open direction, the resilient portion is engaged with the engaging portion, so as to restrain the handle from rotating in a close direction. When the resilient portion is disengaged from the engaging portion, the handle is capable of being operated to rotate with respect to the tray body in the close direction.

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1. An electronic device comprising: a casing comprising a support frame, the support frame having a first rack, a second rack and a rod member; anda tray comprising: a tray body;a handle;a first gear fixed on the handle and pivotally connected to the tray body;a second gear pivotally connected to th

1. An electronic device comprising: a casing comprising a support frame, the support frame having a first rack, a second rack and a rod member; anda tray comprising: a tray body;a handle;a first gear fixed on the handle and pivotally connected to the tray body;a second gear pivotally connected to the tray body, the second gear having an engaging portion;a linking member connected to the first gear and the second gear; anda block member fixed on the tray body, the block member having a resilient portion;wherein when the handle rotates with respect to the tray body to a predetermined angle in an open direction, the resilient portion is engaged with the engaging portion, so as to restrain the handle from rotating with respect to the tray body in a close direction, the close direction is opposite to the open direction; when the handle is located at the predetermined angle with respect to the tray body and the tray is placed into the casing, the rod member moves the resilient portion, such that the resilient portion is disengaged from the engaging portion; when the resilient portion is disengaged from the engaging portion, the first gear contacts the first rack, the second gear contacts the second rack, and the handle is capable of being operated to rotate with respect to the tray body in the close direction. 2. The electronic device of claim 1, further comprising: a first circuit board disposed in the casing, the first circuit board having a first connector; anda second circuit board disposed on the tray body, the second circuit board having a second connector;wherein when the handle rotates with respect to the tray body to the predetermined angle, the first connector and the second connector are separated from each other; when the handle rotates with respect to the tray body and the handle is closed with respect to the tray body, the first connector and the second connector are connected to each other. 3. The electronic device of claim 1, wherein the tray body has a block portion; when the handle rotates with respect to the tray body to the predetermined angle in the open direction, the block portion restrains the handle from continuing to rotate with respect to the tray body in the open direction. 4. The electronic device of claim 1, wherein the block member further has a press portion, the press portion extends from the resilient portion; when the resilient portion is engaged with the engaging portion and the press portion is pressed, the press portion drives the resilient portion to come off the engaging portion. 5. The electronic device of claim 1, wherein the first gear and the second gear have identical number of teeth and modules; when the handle rotates with respect to the tray body in the close direction, the first gear meshes with the first rack and rotates and the first gear drives the second gear to mesh with the second rack and rotate through the linking member, such that the tray body moves in a direction parallel to the first rack and the second rack. 6. The electronic device of claim 1, wherein the linking member is a linking bar or a reversing gear set. 7. The electronic device of claim 1, wherein the support frame further has a guiding groove, the tray body further has a guiding pillar; when the tray is placed into the casing, the guiding pillar enters the guiding groove. 8. The electronic device of claim 7, wherein the guiding groove has two end inclines, the two end inclines are opposite to each other; when the guiding pillar passes through the two end inclines, the first gear contacts the first rack and the second gear contacts the second rack. 9. The electronic device of claim 8, wherein the guiding groove has a bottom incline, the bottom incline is located between the two end inclines. 10. The electronic device of claim 1, wherein the predetermined angle is 90 degrees. 11. The electronic device of claim 1, further comprising a protection frame, a sliding groove being formed between the support frame and a side wall of the casing, the protection frame being disposed in the sliding groove and capable of sliding between a recovery position and a protection position, the support frame further having a first side wall, the protection frame having a second side wall and a protection cover, wherein when the protection frame is located at the recovery position, a guiding groove is formed between the first side wall and the second side wall; when the protection frame is located at the protection position, the first side wall and the second side wall abut against each other, the guiding groove disappears, and the protection cover covers the second rack. 12. The electronic device of claim 11, wherein the handle has a protruding portion, the protection frame further has an engaging groove; when the protection frame is located at the recovery position, the tray is placed into the casing and the handle rotates with respect to the tray body, the protruding portion passes through an opening of the engaging groove; when the handle is closed with respect to the tray body and the protection frame is located at the protection position, a side wall of the engaging groove covers the protruding portion. 13. The electronic device of claim 11, wherein the tray body further has a guiding pillar; when the protection frame is located at the recovery position and the tray is placed into the casing, the guiding pillar enters the guiding groove. 14. The electronic device of claim 13, wherein the second side wall has a block portion; when the tray is placed into the casing, the handle is closed with respect to the tray body and the protection frame is located at the protection position, the block portion covers the guiding pillar. 15. The electronic device of claim 11, wherein the support frame further has a protruding platform, the protruding platform has a first block surface and a second block surface, the protection frame further has a recess, the recess has a third block surface and a fourth block surface, the protruding platform is located in the recess, the first block surface is opposite to the third block surface, the second block surface is opposite to the fourth block surface; when the protection frame is located at the recovery position, the first block surface retains the third block surface, so as to restrain the protection frame from continuing to slide; when the protection frame is located at the protection position, the second block surface retains the fourth block surface, so as to restrain the protection frame from continuing to slide. 16. The electronic device of claim 11, further comprising a resilient member and a power box, the power box being disposed in the casing, opposite ends of the resilient member being connected to the protection frame and the power box. 17. A tray comprising: a tray body;a handle;a first gear fixed on the handle and pivotally connected to the tray body;a second gear pivotally connected to the tray body, the second gear having an engaging portion;a linking member connected to the first gear and the second gear, the first gear driving the second gear to rotate through the linking member; anda block member fixed on the tray body, the block member having a resilient portion;wherein when the handle rotates with respect to the tray body to a predetermined angle in an open direction, the resilient portion is engaged with the engaging portion, so as to restrain the handle from rotating with respect to the tray body in a close direction, the close direction is opposite to the open direction; when the resilient portion is disengaged from the engaging portion, the handle is capable of being operated to rotate with respect to the tray body in the close direction. 18. The tray of claim 17, wherein the tray body has a block portion; when the handle rotates with respect to the tray body to the predetermined angle in the open direction, the block portion restrains the handle from continuing to rotate with respect to the tray body in the open direction. 19. The tray of claim 17, wherein the block member further has a press portion, the press portion extends from the resilient portion; when the resilient portion is engaged with the engaging portion and the press portion is pressed, the press portion drives the resilient portion to come off the engaging portion. 20. The tray of claim 18, wherein the linking member is a linking bar or a reversing gear set.