Hinge

1. A hinge comprising:

a base seat;

two slide seats mounted on said base seat and arranged along a first axis that extends in a first direction, said slide seats being movable relative to each other along the first axis between an inner position and an outer position, a distance between said slide seats when said slide seats are at the inner position being shorter than that when said slide seats are at the outer position, each slide seat having a slide rail portion that extends about a rotary axis, the rotary axes about which said slide rail portions of said slide seats respectively extend being parallel to each other in the first direction and extending in a second direction that is perpendicular to the first direction;

two rotary members, each having a slide portion that is in sliding contact with said slide rail portion of a respective one of said slide seats, said rotary members being respectively rotatable relative to said slide seats and being respectively rotatable about the rotary axes; and

two pairs of coupling mechanisms connected respectively to said rotary members and connected respectively to said slide seats, such that rotations of said rotary members drive said slide seats to move between the inner position and the outer position.

2. The hinge as claimed in claim 1 , wherein:

said rotary members are respectively rotatable about the rotary axes among a folded position, an unfolded position, and an intermediate position between the folded position and the unfolded position;

when said rotary members are at the unfolded position, said slide seats are at the outer position; and

movement of said rotary members from the unfolded position to the intermediate position drives said slide seats to move, via said coupling mechanisms, from the outer position to the inner position.

3. The hinge as claimed in claim 2 , wherein movement of said rotary members from the intermediate position to the folded position drives said slide seats to move, via said coupling mechanisms, from the inner position to the outer position.

4. The hinge as claimed in claim 1 , wherein:

each coupling mechanism includes

a shaft member extending in the second direction, and

a coupling member interconnecting said shaft member and a respective one of said rotary members, such that movement of said rotary members between the folded position and the unfolded position drives said coupling members to rotate;

for each coupling mechanism, said shaft member is co-rotatable with said coupling member; and

each coupling mechanism further includes

a coupling wheel sleeved co-rotatably on said shaft member, and formed with a curved groove that extends therethrough in the second direction, and

a coupling block having one end that is inserted into and slidable along said curved groove of said coupling wheel, and another end that is connected to the respective one of said slide seats.

5. The hinge as claimed in claim 4 , wherein:

each rotary member further has a slide groove; and

for each coupling mechanism, said coupling member is sleeved on said shaft member, and has a slide block inserted into and slidable along said slide groove of the respective one of said rotary members.

6. The hinge as claimed in claim 4 , wherein:

for each coupling mechanism, said coupling member is sleeved on said shaft member and has a gear portion surrounding said shaft member; and

said hinge further comprises a gear member disposed between and meshing with said gear portions of said coupling members of said coupling mechanisms so that said coupling members of said coupling mechanisms rotate synchronously during the movement of said rotary members between the folded position and the unfolded position.

7. The hinge as claimed in claim 1 , wherein:

said base seat has a receiving space; and

said slide seats are disposed movably in said receiving space.

8. The hinge as claimed in claim 7 , wherein:

said base seat further has a guide recess being in spatial communication with said receiving space and elongated in the first direction; and

each slide seat has a guide protrusion being elongated along a second axis that is parallel to the first axis, engaging said guide recess of said base seat, and slidable along the second axis.

9. The hinge as claimed in claim 7 , wherein:

said base seat includes a base segment, and two side segments that are connected respectively to opposite ends of said base segment in the second direction, and that cooperate with said base segment to define said receiving space thereamong; and

said hinge further comprises two limit rods that extend in the second direction, that are connected between said side segments of said base seat, and that are respectively disposed at opposite outer sides of said slide seats in the first direction for arresting movement of said slide seats when said slide seat is moved to the outer position.

10. The hinge as claimed in claim 9 , wherein:

each slide seat further has a rod groove; and

said limit rods are disposed respectively in said rod grooves of said slide seats.