Child booster seat with a height-adjustable armrest

1. A child booster seat, comprising:

a seat base;

an armrest support coupled to said seat base and formed with an installation space that opens upward, said armrest support having a wall confronting said installation space and formed with a plurality of restraining parts located at different heights of said armrest support; and

an armrest assembly including

a latching component including a tongue board that extends into said installation space and that is movable vertically within said installation space, and a stop piece that projects from said tongue board for engaging selectively said restraining parts, and

an armrest component coupled to said tongue board and vertically co-movable with said tongue board relative to said armrest support, said armrest component being supported at a selected height of said armrest support when said stop piece engages one of said restraining parts;

wherein said tongue board is operable to move said stop piece relative to said armrest component for disengaging said restraining parts and permitting height adjustment of said armrest assembly relative to said armrest support;

wherein said armrest component is formed with a slot that opens upward and an access opening in spatial communication with said slot, said tongue board being received in said slot, said stop piece protruding through said access opening when said stop piece engages one of said restraining parts.

2. The child booster seat as claimed in claim 1 , wherein said restraining parts include a first stop opening and a second stop opening that are formed in said armrest support and that are vertically spaced apart from each other.

3. The child booster seat as claimed in claim 1 , wherein said armrest assembly further includes a pressing component that is installed on said armrest component, and that has a pressing side and a pushing side, said pushing side abutting against said tongue board of said latching component such that a horizontal force on said pressing side is transmitted to said tongue board to move said stop piece relative to said armrest component for disengaging said restraining parts.

4. The child booster seat as claimed in claim 3 , wherein said pressing component is located at a height position between said stop piece and a coupling junction between said tongue board and said armrest component.

5. The child booster seat as claimed in claim 3 , further comprising a position limiting mechanism provided on said armrest support and said armrest component for limiting vertical movement of said armrest component relative to said armrest support.

6. The child booster seat as claimed in claim 5 , wherein said position limiting mechanism includes a hole-defining portion that is provided on one of said wall of said armrest support and said armrest component and that defines a position limiting hole, and a position limiting block that is provided on the other one of said wall of said armrest support and said armrest component and that extends into said position limiting hole to limit the vertical movement of said armrest component relative to said armrest support.

7. The child booster seat as claimed in claim 3 , wherein said armrest assembly further includes a return spring located between said tongue board and said armrest component for biasing said tongue board to move said stop piece toward said restraining parts.

8. The child booster seat as claimed in claim 7 , wherein said tongue board has one end that is opposite to said stop piece and that is pivotable relative to said armrest component about a horizontal axis.

9. The child booster seat as claimed in claim 8 , wherein:

one of said tongue board and said armrest component is formed with an indentation;

the other one of said tongue board and said armrest component is formed with a protrusion; and

said return spring has a first spring end sleeved on said protrusion and a second spring end received in said indentation.

10. The child booster seat as claimed in claim 1 , wherein said restraining parts include vertically spaced apart upper and lower arc edges on said wall of said armrest support, and said stop piece has a peripheral contour conforming with those of said upper and lower arc edges.

11. The child booster seat as claimed in claim 10 , wherein said armrest component includes a vertical board portion that is formed with said access opening, and a horizontal board portion that is connected to a top end of said vertical board portion and that is formed with said slot;

said tongue board having a top portion that is connected to said horizontal board portion, and an extension portion that extends downwardly from said top portion, that is received in said slot, and that is formed with said stop piece.

12. The child booster seat as claimed in claim 11 , further comprising a position limiting mechanism provided on said armrest support and said armrest component for limiting vertical movement of said armrest component relative to said armrest support.

13. The child booster seat as claimed in claim 12 , wherein said position limiting mechanism includes a limit block protruding from said vertical board portion, and a stop block protruding from said armrest support into said installation space and vertically aligned with said limit block, and wherein engagement between said limit block and said stop block prevents said armrest assembly from separating from said armrest support when said armrest assembly is moved vertically upward relative to said armrest support.

14. The child booster seat as claimed in claim 11 , wherein said extension portion is deformable by a horizontal force to move said stop piece relative to said armrest component for disengaging said restraining parts.

15. The child booster seat as claimed in claim 14 , wherein said extension portion is resilient and biases said stop piece toward said restraining parts.

16. The child booster seat as claimed in claim 14 , wherein said armrest assembly further includes a pressing component that is installed on said armrest component, and that has a pressing side and a pushing side, said pushing side abutting against said extension portion such that the horizontal force on said pressing side is transmitted to said extension portion to move said stop piece relative to said armrest component for disengaging said restraining parts.

17. The child booster seat as claimed in claim 16 , wherein said pressing component is located at a height position between said top portion and said stop piece.

18. A child booster seat, comprising:

a seat base;

an armrest support coupled to said seat base and formed with an installation space that opens upward, said armrest support having a wall confronting said installation space and formed with a plurality of restraining parts located at different heights of said armrest support; and

an armrest assembly including

a latching component including a tongue board that extends into said installation space and that is movable vertically within said installation space, and a stop piece that projects from said tongue board for engaging selectively said restraining parts, and

an armrest component coupled to said tongue board and vertically co-movable with said tongue board relative to said armrest support, said armrest component being supported at a selected height of said armrest support when said stop piece engages one of said restraining parts;

wherein said tongue board is operable to move said stop piece relative to said armrest component for disengaging said restraining parts and permitting height adjustment of said armrest assembly relative to said armrest support;

wherein said armrest assembly further includes a pressing component that is installed on said armrest component, and that has a pressing side and a pushing side, said pushing side abutting against said tongue board of said latching component such that a horizontal force on said pressing side is transmitted to said tongue board to move said stop piece relative to said armrest component for disengaging said restraining parts.