Foldable highchair

Abstract

A foldable highchair includes a chair frame, a seat unit mounted on the chair frame, and a latch unit provided on the chair frame. The chair frame is in a form of a four-link mechanism, and is convertible between upright and collapsed states. The chair frame includes a base, a front leg unit, a coupling link unit, and a rear leg unit. The latch unit is operable to prevent pivoting movement of the front leg unit, the coupling link unit and the rear leg unit relative to the base, thereby locking the chair frame in the upright state. The latch unit is further operable to unlock the chair frame and permit pivoting movement of and collapsing of the front leg unit, the coupling link unit and the rear leg unit together with the seat unit on the base, thereby converting the chair frame to the collapsed state.

1 . A foldable highchair comprising:
 a chair frame in a form of a four-link mechanism, said chair frame being convertible between upright and collapsed states and including   a base,   a front leg unit having a pivot end part connected pivotally to said base, extending upwardly from said base when said chair frame is in the upright state, and further having a coupling end part opposite to said pivot end part,   a coupling link unit connected pivotally to said coupling end part of said front leg unit and extending rearwardly and inclining upwardly relative to said front leg unit when said chair frame is in the upright state, and   a rear leg unit having a pivot end portion connected pivotally to said base, said rear leg unit being spaced apart from and being disposed rearwardly of said front leg unit, said rear leg unit extending upwardly from said base and inclining forwardly when said chair frame is in the upright state, said rear leg unit further having a coupling end portion opposite to said pivot end portion and connected pivotally to said coupling link unit;   a seat unit mounted on said chair frame; and   a latch unit provided on said chair frame and operable to prevent pivoting movement of said front leg unit, said coupling link unit and said rear leg unit relative to said base, thereby locking said chair frame in the upright state, said latch unit being further operable to unlock said chair frame and permit pivoting movement of and collapsing of said front leg unit, said coupling link unit and said rear leg unit together with said seat unit on said base, thereby converting said chair frame from the upright state to the collapsed state.   
   
   
       2 . The foldable highchair as claimed in  claim 1 , wherein said coupling link unit has a leg coupling end, and said front leg unit includes left and right front leg rods that are spaced apart from each other, each of said front leg rods being connected pivotally to said base and to said leg coupling end of said coupling link unit, and extending upwardly from said base and inclining forwardly when said chair frame is in the upright state. 
   
   
       3 . The foldable highchair as claimed in  claim 1 , wherein said rear leg unit further has left and right rear leg rods that extend from said pivot end portion, that are spaced apart from each other, and that have terminating ends opposite to said pivot end portion, said terminating ends of said left and right rear leg rods being disposed at left and right sides of said coupling link unit and serving as said coupling end portion of said rear leg unit, said coupling link unit being disposed between said left and right rear leg rods when said chair frame is in the collapsed state. 
   
   
       4 . The foldable highchair as claimed in  claim 1 , wherein said rear leg unit includes a rear leg rod that is connected pivotally to said base and to said coupling link unit, and a latch seat that is mounted on one end of said rear leg rod opposite to said base and that is disposed in front of said coupling link unit,
 said latch unit being provided on said coupling link unit to engage releasably said latch seat.   
   
   
       5 . The foldable highchair as claimed in  claim 4 , wherein said latch unit includes a hook member mounted to said coupling link unit for engaging releasably said latch seat, and an operating component operable to drive said hook member to disengage from said latch seat. 
   
   
       6 . The foldable highchair as claimed in  claim 5 , wherein said latch seat is formed with a latch hole to engage releasably said hook member. 
   
   
       7 . The foldable highchair as claimed in  claim 1 , wherein said seat unit includes:
 a backrest plate mounted on one side of said coupling link unit;   a seat member connected pivotally to said backrest plate;   a dish tray connected pivotally to said backrest plate and disposed above and spaced apart from said seat member;   a link rod mechanism connected pivotally to said seat member and said dish tray; and   at least one pull rod connected pivotally to said seat member and said chair frame;   wherein said backrest plate, said seat member, said dish tray and said link rod mechanism cooperate to form a second four-link mechanism; and   wherein said coupling link unit and said pull rod cooperate to collapse said backrest plate, said seat member, said dish tray and said link rod mechanism toward said base when said chair frame is converted from the upright state to the collapsed state.   
   
   
       8 . The foldable highchair as claimed in  claim 7 , wherein said seat unit further includes a footrest mounted to said link rod mechanism.