Infant swing

1. An infant swing comprising:

a carrier for holding an infant;

a first foot having a first pivot base;

at least one arm connected to the first foot and the carrier;

a second foot having a second pivot base, the second pivot base being connected the first pivot base, and the second foot being used for supporting the carrier above a supporting surface cooperatively with the first foot and the arm;

a pivotal positioning mechanism disposed between the first pivot base and the second pivot base, the pivotal positioning mechanism comprising:

an engaging part movably disposed at a position where the first pivot base is pivotally connected to the second pivot base, for engaging with the first pivot base and the second pivot base to fix a position of the first pivot base relative to the second pivot base, wherein at least one first positioning groove is formed on the first pivot base, a plurality of second positioning grooves are formed on the second pivot base, the engaging part is axially movable between the first pivot base and the second pivot base, the engaging part has at least one tooth, the tooth is simultaneously engaged with the first positioning groove and at least one of the second positioning grooves so as to fix a position of the first pivot base relative to the second pivot base when the engaging part is located at a locking position, and the tooth is separate from at least one of the second positioning grooves so as to make the first pivot base capable of rotating relative to the second pivot base when the engaging part is located at a releasing position;

a driving device for connecting to and driving the arm; and

a power supply device partially disposed in a containing space formed on a side of the first pivot base of the first foot opposite to the pivotal positioning mechanism for providing electric power to the driving device so as to make the carrier capable of swinging relative to the first foot.

2. The infant swing of claim 1 , wherein the pivotal positioning mechanism further comprises:

an operating part movably disposed on the second pivot base for driving the engaging part to move to the releasing position.

3. The infant swing of claim 2 , wherein the operating part is a button, and the button is axially movable on the second pivot base.

4. The infant swing of claim 1 , wherein the pivotal positioning mechanism further comprises:

an elastic part pressing the engaging part for providing an elastic force to drive the engaging part to move to the locking position.

5. The infant swing of claim 4 , wherein the elastic part is a spring, and the spring is disposed between the engaging part and the first pivot base.

6. The infant swing of claim 1 , wherein the engaging part is one of a plastic gear and a pin.

7. The infant swing of claim 1 , wherein the power supply device comprises:

a battery disposed in the containing space; and

a cover disposed on the first pivot base for covering the battery.

8. The infant swing of claim 7 , wherein the battery is a rechargeable battery.

9. The infant swing of claim 8 , wherein the power supply device further comprises:

a plug disposed on the first pivot base and electrically connected to the battery.

10. The infant swing of claim 9 , wherein the plug is located at the first pivot base and tilted downward relative to a horizontal direction by a specific angle.

11. The infant swing of claim 10 , wherein the specific angle is substantially equal to 45 degrees.

12. The infant swing of claim 1 , wherein the driving device is disposed on a top portion of the first foot.

13. The infant swing of claim 1 , wherein the pivotal positioning mechanism comprises:

at least one stopper formed on the first pivot base; and

at least one sliding block formed on the second pivot base, for abutting against the stopper so as to constrain the rotation range of the second foot relative to the first foot when the second pivot base rotates relative to the first pivot base.

14. The infant swing of claim 13 , wherein the stopper comprises two limiting blocks, and the sliding block abuts against one of the two limiting blocks when the second pivot base rotates relative to the first pivot base.