Vibration dampening device and infant carrier therewith

1. A vibration dampening device used in an infant carrier which has a carrier frame and a wheel, the vibration dampening device being disposed between the carrier frame and the wheel, the vibration dampening device comprising:

a first vibration dampening part disposed between the carrier frame and the wheel;

a second vibration dampening part disposed between the carrier frame and the wheel; and

an actuator movably disposed on one of the carrier frame and the wheel;

wherein the actuator has a releasing position and an enabling position for adjusting an action range of the second vibration dampening part moving to the actuator, the actuator is separated from the second vibration dampening part by a first movement distance when the actuator is located at the releasing position, the first movement distance is longer than zero, the second vibration dampening part is movable relative to the actuator within the first movement distance, the actuator is separated from the second vibration dampening part by a second movement distance when the actuator is located at the enabling position, the second movement distance is longer than or equal to zero, the second movement distance is shorter than the first movement distance, and the second vibration dampening part is movable relative to the actuator within the second movement distance or contacts the actuator.

2. The vibration dampening device of claim 1 , further comprising a mount and a rotational base, wherein the mount is disposed on the carrier frame, the rotational base is pivotally connected to the mount, the wheel is disposed on the rotational base, the first vibration dampening part and the second vibration dampening part are disposed between the mount and the rotational base, and the actuator is movably disposed on the mount.

3. The vibration dampening device of claim 2 , wherein a limitation post is disposed on one of the rotational base and the mount, the limitation post is parallel to a rotation axis of the rotational base, the other one of the rotational base and the mount has an arc limitation slot extending about the rotation axis of the rotational base, and the limitation post slidably passes through the arc limitation slot.

4. The vibration dampening device of claim 2 , wherein the first vibration dampening part is disposed perpendicular to a rotation axis of the rotational base, and the second vibration dampening part is disposed parallel to the first vibration dampening part.

5. The vibration dampening device of claim 2 , further comprising an upper base and a lower base, wherein the upper base is disposed on the mount, the lower base is disposed on the rotational base, an upper end of the first vibration dampening part abuts against the upper base, and a lower end of the first vibration dampening part abuts against the lower base.

6. The vibration dampening device of claim 5 , wherein a lower end of the lower base is pivotally connected to the rotational base, and a rotation axis of the lower base is parallel to a rotation axis of the rotational base.

7. The vibration dampening device of claim 6 , wherein the rotational base has a pivotal connection portion protruding outward, the lower base is pivotally connected to the pivotal connection portion.

8. The vibration dampening device of claim 5 , wherein the upper base has a first ring recess with a downward opening, the lower base has a second ring recess with an upward opening, the upper end of the first vibration dampening part abuts against the first ring recess, and the lower end of the first vibration dampening part abuts against the second ring recess.

9. The vibration dampening device of claim 5 , wherein a lower end of the second vibration dampening part abuts against the lower base, and an upper end of the second vibration dampening part slidably passes through the upper base.

10. The vibration dampening device of claim 9 , wherein the lower base has a socket slot, the lower end of the second vibration dampening part is inserted in the socket slot, the upper base has a through hole, and the upper end of the second vibration dampening part slidably passes through the through hole.

11. The vibration dampening device of claim 9 , wherein the second vibration dampening part passes through the first vibration dampening part.

12. The vibration dampening device of claim 9 , wherein the mount has a protruding installation portion, the actuator is movably disposed in the installation portion, and the upper base is disposed in the installation portion.

13. The vibration dampening device of claim 12 , wherein the installation portion has an accommodating recess, the actuator is partially slidably disposed in the accommodating recess, the actuator is rotatable in the accommodating recess, at least two protrusive steps are disposed on a recess wall of the accommodating recess in a rotational direction of the actuator, a release passageway is formed between adjacent two of the at least two protrusive steps, at least one blocked rib is disposed on a side wall of the actuator in the rotational direction of the actuator, when the actuator is located at the releasing position, the blocked rib is aligned with the release passageway, and when the actuator is located at the enabling position, the blocked rib is aligned with one of the at least two protrusive steps and is against the aligned protrusive step.

14. The vibration dampening device of claim 13 , wherein the protrusive step has a curved transition portion and a limitation protrusion, and when the actuator is located at the enabling position, the blocked rib is located between the curved transition portion and the limitation protrusion.

15. The vibration dampening device of claim 13 , further comprising a manipulation part disposed on the actuator.

16. The vibration dampening device of claim 15 , wherein the installation portion has a through hole, and the actuator partially passes through the through hole and is connected to the manipulation part.

17. The vibration dampening device of claim 12 , further comprising an elastic restoring part, wherein an upper end of the elastic restoring part abuts against the actuator, a lower end of the elastic restoring part abuts against one of the installation portion and the upper base, and the elastic restoring part always urges the actuator to move in a direction away from the second vibration dampening part.

18. The vibration dampening device of claim 13 , wherein at least one supporting protrusion is disposed on the recess wall of the accommodating recess, and the upper base abuts against the at least one supporting protrusion.

19. The vibration dampening device of claim 1 , wherein the first vibration dampening part is a vibration dampening spring.

20. The vibration dampening device of claim 1 , wherein the second vibration dampening part is an elastic vibration dampening core.

21. An infant carrier, comprising:

a carrier frame having a rear supporting leg;

a wheel; and

a vibration dampening device disposed between the carrier frame and the wheel and on the rear supporting leg, the vibration dampening device comprising:

a first vibration dampening part disposed between the carrier frame and the wheel;

a second vibration dampening part disposed between the carrier frame and the wheel; and

an actuator movably disposed on one of the carrier frame and the wheel;

wherein the actuator has a releasing position and an enabling position for adjusting an action range of the second vibration dampening part moving to the actuator.