Infant chair apparatus

1. An infant chair apparatus comprising:

a support frame;

a seat pivotally connected with the support frame about a pivot axis and provided with a coupling member; and

a swing drive assembly connected with the seat and the support frame, wherein the swing drive assembly includes:

a spring having a first end affixed with the support frame and a movable second end operatively connected with the coupling member, wherein the spring is operable to apply a spring force that is converted into a driving torque applied on the coupling member to impart a swing motion to the seat; and

a torque adjusting mechanism respectively connected with the second end of the spring and the coupling member, the torque adjusting mechanism being operable to adjust a position of the coupling member relative to the seat.

2. The infant chair apparatus according to claim 1 , wherein the torque adjusting mechanism includes a flexible transmission member having a first and a second end, the first end of the transmission member being connected with the second end of the spring, the second end of the transmission member being connected with the coupling member, and a displacement of the coupling member causes a displacement of the second end of the spring and modifies a lever arm of the driving torque relative to the pivot axis.

3. The infant chair apparatus according to claim 2 , wherein the torque adjusting mechanism further includes a pulley, and the transmission member wraps around the pulley to define a first segment extending between the second end of the spring and the pulley, and a second segment that extends between the pulley and the coupling member and intersects the first segment at an angle.

4. The infant chair apparatus according to claim 3 , wherein the seat has a side portion provided with a guide slot along which the coupling member is movable relative to the seat.

5. The infant chair apparatus according to claim 4 , wherein the guide slot intersects the second segment of the transmission member at an angle.

6. The infant chair apparatus according to claim 4 , wherein the guide slot extends in a same direction as the second segment of the transmission member.

7. The infant chair apparatus according to claim 1 , wherein the torque adjusting mechanism includes a driving member connected with the seat, the driving member being formed as a screw thread that is engaged with the coupling member, a rotation of the driving member causing a sliding displacement of the coupling member relative to the seat via engagement of the coupling member with the screw thread.

8. The infant chair apparatus according to claim 7 , wherein the driving member has an end affixed with a rotary knob.

9. The infant chair apparatus according to claim 7 , wherein the torque adjusting mechanism further includes a stop member affixed with the seat, the stop member limiting a displacement of the coupling member along the driving member.

10. The infant chair apparatus according to claim 1 , wherein the torque adjusting mechanism includes:

a driving member pivotally connected with the seat and having a first and a second end opposite to each other, the first end of the driving member being connected with the coupling member; and

an actuator button connected with the second end of the driving member, the actuator button being selectively engageable with the seat.

11. The infant chair apparatus according to claim 10 , wherein the driving member is rotatable to modify the position of the coupling member relative to the seat.

12. The infant chair apparatus according to claim 10 , wherein the connection between the driving member and the coupling member allows a limited displacement of the coupling member relative to the driving member during rotation of the driving member.

13. The infant chair apparatus according to claim 10 , wherein the actuator button is movable radially relative to a rotation axis of the driving member, and has an engaging protrusion that engages with any of a plurality of grooves provided on the seat to rotationally lock the driving member.

14. The infant chair apparatus according to claim 13 , wherein the torque adjusting mechanism further includes a second spring respectively connected with the actuator button and the driving member, the second spring biasing the engaging protrusion to engage with any of the grooves.

15. The infant chair apparatus according to claim 1 , wherein the spring has a first end affixed with the support frame and a movable second end connected with the torque adjusting mechanism, the torque adjusting mechanism includes a second spring having a first end connected with the support frame and a second end connected with the coupling member.

16. The infant chair apparatus according to claim 1 , further including:

a recline adjusting mechanism connected with the seat for locking the seat with the support frame, and unlocking the seat to allow adjustment of an inclination of the seat; and

a switch disposed on the seat and operatively connected with the recline adjusting mechanism, wherein the switch is movable between a swing enabling state in which the recline adjusting mechanism is held in an unlocking state and a locking movement of the recline adjusting mechanism is blocked, and a swing disabling state in which movement of the recline adjusting mechanism is allowed to move to a locking state for locking the seat in place.

17. The infant chair apparatus according to claim 16 , wherein the recline adjusting mechanism includes:

a latch assembled with the seat, the latch being movable to engage with any of a plurality of locking openings provided in the support frame at different radial positions relative to the pivot axis;

a handle assembled with the seat, the handle being actuated to cause the latch to disengage from any of the locking openings; and

a transmission member connecting the latch with the handle.

18. The infant chair apparatus according to claim 17 , wherein the switch is assembled adjacent to the handle.

19. The infant chair apparatus according to claim 18 , wherein the switch is pivotally connected with the seat and has a radial arm, the radial arm being operable to rotate between a first position where the radial arm pushes the handle upward corresponding to the swing enabling state, and a second position where the radial arm lies substantially horizontal and allows a locking displacement of the handle.

20. The infant chair apparatus according to claim 16 , being configured as an infant high chair when the switch is in the swing disabling state.