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A child seat comprises a seat part, a backrest operable to rotate relative to the seat part, a backrest adjusting mechanism and a safety lock movably mounted on the backrest. The backrest adjusting mechanism comprises a positioning element mounted stationary relative to the seat part, and a latch el

A child seat comprises a seat part, a backrest operable to rotate relative to the seat part, a backrest adjusting mechanism and a safety lock movably mounted on the backrest. The backrest adjusting mechanism comprises a positioning element mounted stationary relative to the seat part, and a latch element mounted on the backrest and movable to engage with the positioning element. The positioning element comprises a channel that delimits a range of adjustable angular positions of the backrest relative to the seat part. In addition, the safety lock has a lock position adapted to restrict displacement of the latch element relative to the channel, and an unlock position enabling the latch element to move out of the channel when the backrest is moved out of the range of adjustable angular positions toward a position lying substantially parallel with the seat part.

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1. A child seat comprising: a seat part;a backrest operable to rotate relative to the seat part;a backrest adjusting mechanism, comprising a positioning structure provided stationary relative to the seat part, and a latch element mounted on the backrest, wherein the positioning structure comprises a

1. A child seat comprising: a seat part;a backrest operable to rotate relative to the seat part;a backrest adjusting mechanism, comprising a positioning structure provided stationary relative to the seat part, and a latch element mounted on the backrest, wherein the positioning structure comprises a channel that delimits a range of first positions of the backrest relative to the seat part, the latch element engaging with the positioning structure to hold the backrest in any of the first positions; anda safety lock movably mounted on the backrest and operable independently from the latch element, wherein the safety lock has a lock position adapted to restrict displacement of the latch element relative to the channel such that an adjustment range of the backrest is limited to the first positions, and an unlock position enabling the latch element to move out of the channel as the backrest is adjusted toward a second position lying substantially parallel with the seat part. 2. The child seat according to claim 1, wherein the channel comprises a plurality of slots, and the latch element is movable relative to the backrest to engage with any one of the slots for holding the backrest at an angle relative to the seat part. 3. The child seat according to claim 2, wherein the safety lock is provided on a rear side of the backrest, and the latch element moves toward the safety lock for disengaging from any one of the slots in the positioning structure. 4. The child seat according to claim 2, wherein the lock position of the safety lock delimits a maximum course of the latch element relative to the backrest in a direction for disengaging from any one of the slots. 5. The child seat according to claim 4, wherein the unlock position of the safety lock enlarges the maximum course of the latch element relative to the backrest. 6. The child seat according to claim 1, wherein the safety lock comprises a rotary knob. 7. The child seat according to claim 6, wherein the safety lock further includes a torsion spring operable to bias the rotary knob from the unlock position to the lock position. 8. The child seat according to claim 1, wherein at least one end of the channel comprises a movable abuttal element coupled with a spring element, the latch element pushing against and causing displacement of the abuttal element to enter the channel when the backrest is adjusted from the position lying substantially parallel with the seat part to any of the first positions. 9. A child seat comprising: a seat part;a backrest operable to rotate relative to the seat part;a backrest adjusting mechanism, comprising a positioning element mounted stationary relative to the seat part, and a latch element mounted on the backrest and movable to engage with the positioning element, wherein the positioning element comprises a channel that delimits a range of adjustable angular positions of the backrest relative to the seat part; anda safety lock movably mounted on the backrest, wherein the safety lock has a lock position adapted to restrict displacement of the latch element relative to the channel, and an unlock position enabling the latch element to move out of the channel when the backrest is moved out of the range of adjustable angular positions toward a position lying substantially parallel with the seat part;wherein the backrest includes a headrest portion that rotates toward a rear side of the backrest when the backrest is adjusted to the position lying substantially parallel with the seat part. 10. A child seat comprising: a seat part;a backrest operable to rotate relative to the seat part;a backrest adjusting mechanism, comprising a positioning structure provided stationary relative to the seat part, and a latch element mounted on the backrest, wherein the positioning structure comprises a channel along which the latch element moves as the backrest is adjusted between multiple first positions relative to the seat part, and the latch element is operable to engage with the positioning structure to hold the backrest in any of the first positions; anda safety lock movably mounted on the backrest, wherein the safety lock has a lock position and an unlock position, the safety lock when in the lock position restricts movements of the latch element within boundaries of the channel such that an adjustment range of the backrest is limited to the first positions, and the safety lock when in the unlock position allows the latch element to move outside the channel as the backrest is adjusted toward a second position lying substantially parallel with the seat part. 11. The child seat according to claim 10, wherein the channel comprises a plurality of slots, and the latch element is movable relative to the backrest to engage with any one of the slots for holding the backrest at any of the first positions relative to the seat part. 12. The child seat according to claim 11, wherein the safety lock is provided on a rear side of the backrest, and the latch element moves toward the safety lock for disengaging from any one of the slots in the positioning structure. 13. The child seat according to claim 11, wherein the lock position of the safety lock delimits a maximum course of the latch element relative to the backrest in a direction for disengaging from any one of the slots. 14. The child seat according to claim 13, wherein the unlock position of the safety lock enlarges the maximum course of the latch element relative to the backrest in the direction for disengaging from any one of the slots. 15. The child seat according to claim 10, wherein the safety lock comprises a rotary knob, and a torsion spring operable to bias the rotary knob toward the lock position. 16. The child seat according to claim 10, wherein at least one end of the channel comprises a movable abuttal element coupled with a spring element, the latch element pushing against and causing displacement of the abuttal element to enter the channel when the backrest is adjusted from the second position lying substantially parallel with the seat part to any of the first positions. 17. A child seat comprising: a seat part;a backrest operable to rotate relative to the seat part;a backrest adjusting mechanism, comprising a positioning structure provided stationary relative to the seat part, and a latch element mounted on the backrest and movable to engage with the positioning structure to hold the backrest in multiple first positions inclined relative to the seat part; anda safety lock operable between a lock state and an unlock state independently from the latch element, wherein the safety lock when in the lock state limits an adjustment range of the backrest to the first positions, and the safety lock when in the unlock state allows movements of the backrest outside the adjustment range of the first positions. 18. The child seat according to claim 17, wherein the safety lock when in the unlock state allows adjustment of the backrest to a second position that is outside the adjustment range of the first positions and substantially parallel to the seat part. 19. The child seat according to claim 17, wherein the safety lock comprises a rotary knob having a first edge portion that is oriented toward the latch element when the safety lock is in the lock state, and a second edge portion that is oriented toward the latch element when the safety lock is in the unlock state. 20. The child seat according to claim 19, wherein the first and second edge portion respectively delimit a first and a second maximum course of the latch element in a direction that disengages the latch element from the positioning structure for allowing adjustment of the backrest, the second maximum course being greater than the first maximum course. 21. The child seat according to claim 17, wherein the positioning structure includes a movable abuttal element coupled with a spring element, and the latch element pushes and causes displacement of the abuttal element as the backrest is adjusted from the second position to any of the first positions.