Angle-adjustable backrest device for a child highchair

An angle-adjustable backrest device for a chair that includes a leg frame and a seat connected to the leg frame, said angle-adjustable backrest device comprising:

• a backrest frame;
• and
• an angle-adjusting device operable for connecting said backrest frame to the chair, said angle-adjusting device including
• a mounting seat operable for mounting on the leg frame, the mounting seat having an inner side wall provided with a plurality of positioning components, said mounting seat including a first annular sleeve at said inner side wall,
• a pivot seat operable for mounting on the seat, the pivot seat being connected to said backrest frame and pivoted to said inner side wall of said mounting seat, said pivot seat including a second annular sleeve having a diameter smaller than that of said first annular sleeve, said first annular sleeve being sleeved rotatably on said second annular sleeve, and
• a locking unit including
• a slide member mounted slidably on said backrest frame, the slide member having one side formed with a positioning groove, said slide member being movable on said backrest frame from an engaging position, where said positioning groove engages a selected one of said positioning components on said mounting seat to lock said backrest frame at a desired angle relative to the leg frame, and a disengaging position, where said positioning groove is disengaged from said positioning components on said mounting seat to permit adjustment of the angle of said backrest frame relative to the leg frame,
• a first biasing member for biasing said slide member to the engaging position, and
• an actuator unit connected to said slide member, the actuator unit being operable to drive movement of said slide member from the engaging position to the disengaging position.

An angle-adjustable backrest device for a chair that includes a leg frame and a seat connected to the leg frame, said angle-adjustable backrest device comprising:

• a backrest frame;
• and
• an angle-adjusting device operable for connecting said backrest frame to the chair, said angle-adjusting device including
• a mounting seat operable for mounting on the leg frame, the mounting seat having an inner side wall provided with a plurality of positioning components,
• a pivot seat operable for mounting on the seat, the pivot seat being connected to said backrest frame and pivoted to said inner side wall of said mounting seat, and
• a locking unit including
• a slide member mounted slidably on said backrest frame, the slide member having one side formed with a positioning groove, said slide member being movable on said backrest frame from an engaging position, where said positioning groove engages a selected one of said positioning components on said mounting seat to lock said backrest frame at a desired angle relative to the leg frame, and a disengaging position, where said positioning groove is disengaged from said positioning components on said mounting seat to permit adjustment of the angle of said backrest frame relative to the leg frame,
• a first biasing member for biasing said slide member to the engaging position,
• a connecting component that has one end connected to said slide member and a second end opposite to the one end
• an actuator unit connected to said slide member, the actuator unit being operable to drive movement of said slide member from the engaging position to the disengaging position, the second end of the connecting component being connected to the actuator unit, said actuator unit including
• a casing mounted on said backrest frame,
• a drive component disposed in said casing, the drive component being connected to said opposite end of said connecting component, and pivotable between initial and releasing positions, and
• a press button mounted movably on said casing, connected to said drive component, and operable to drive movement of said drive component from the initial position to the releasing position for moving said slide member from the engaging position to the disengaging position.

A chair, comprising:

• a leg frame;
• a seat connected to the leg frame;
• and
• an angle-adjustable backrest device that includes
• a backrest frame;
• and
• an angle-adjusting device operable for connecting said backrest frame to the chair and for adjusting an angular position of the backrest frame relative to the leg frame, said angle-adjusting device including
• a mounting seat operable for mounting on the leg frame, the mounting seat having an inner side wall provided with a plurality of positioning components,
• a pivot seat operable for mounting on the seat, the pivot seat being connected to said backrest frame and pivoted to said inner side wall of said mounting seat, the adjustment of the angular position of the backrest frame relative to the leg frame resulting in rotation of the pivot seat relative to the mounting seat causing a simultaneous angular movement of the seat relative to the leg frame, and
• a locking unit including
• a slide member mounted slidably on said backrest frame, the slide member having one side formed with a positioning groove, said slide member being movable on said backrest frame from an engaging position, where said positioning groove engages a selected one of said positioning components on said mounting seat to lock said backrest frame at a desired angle relative to the leg frame, and a disengaging position, where said positioning groove is disengaged from said positioning components on said mounting seat to permit adjustment of the angle of said backrest frame relative to the leg frame,
• a first biasing member for biasing said slide member to the engaging position, and
• an actuator unit connected to said slide member, the actuator unit being operable to drive movement of said slide member from the engaging position to the disengaging position.