A coupling device and method for removably coupling frames of a modular panel system includes a first coupling body fixedly and rotatably connected to a first panel frame of a first panel and a second coupling body fixedly and rotatably connected to a second panel frame of a second panel. The first and second coupling bodies are removably coupled to one another in a coupled state to thereby couple the first panel and the second panel together and are decoupled from one another in a decoupled state to thereby decouple the first panel and the second panel from one another.

A coupling device and method for removably coupling frames of a modular panel system includes a first coupling body fixedly and rotatably connected to a first panel frame of a first panel and a second coupling body fixedly and rotatably connected to a second panel frame of a second panel. The first and second coupling bodies are removably coupled to one another in a coupled state to thereby couple the first panel and the second panel together and are decoupled from one another in a decoupled state to thereby decouple the first panel and the second panel from one another.

A mounting structure of a vacuum-formed backrest board of a folding chair is provided. Edges of a left side and a right side of the vacuum-formed backrest board are folded rearward to form a fixed flange, a surface of the fixed flange comprises one or more inverted buckling protruding teeth, the vacuum-formed backrest board is disposed between two leg tubes of the folding chair symmetrically disposed in a left and right direction, the two leg tubes comprises a mounting buckling groove corresponding to the fixed flange, the fixed flange is disposed in the mounting buckling groove, a lower edge of the vacuum-formed backrest board comprises a vacuum-formed bent edge extending rearward, two ends of an edge banding strip are respectively connected to the two leg tubes, and the vacuum-formed bent edge is wrapped by the edge banding strip.

A mounting structure of a vacuum-formed backrest board of a folding chair is provided. Edges of a left side and a right side of the vacuum-formed backrest board are folded rearward to form a fixed flange, a surface of the fixed flange comprises one or more inverted buckling protruding teeth, the vacuum-formed backrest board is disposed between two leg tubes of the folding chair symmetrically disposed in a left and right direction, the two leg tubes comprises a mounting buckling groove corresponding to the fixed flange, the fixed flange is disposed in the mounting buckling groove, a lower edge of the vacuum-formed backrest board comprises a vacuum-formed bent edge extending rearward, two ends of an edge banding strip are respectively connected to the two leg tubes, and the vacuum-formed bent edge is wrapped by the edge banding strip.

A multi-functional backpack frame system that has a backpack frame configuration and a portable chair configuration. The backpack frame system includes: a first U-shaped subframe with an open end constructed by a pair of upright members connected to a cross member, a second tubular generally U-shaped subframe with an open end constructed by a pair of upright members connected to a cross member, a pair of subframes that can be mechanically fastened such that both are nested to be coplanar in a fixed relation as the backpack configuration, a pair of subframes that can be mechanically fastened such that the planes of each subframe are generally normal with a flexible seat cover as the chair configuration. The conversion into the chair configuration relies on a minimalist, self-intersecting tubular joint method, referred to as a thru joint that does not require additional parts, fasteners, or tools necessary for its use.

A multi-functional backpack frame system that has a backpack frame configuration and a portable chair configuration. The backpack frame system includes: a first U-shaped subframe with an open end constructed by a pair of upright members connected to a cross member, a second tubular generally U-shaped subframe with an open end constructed by a pair of upright members connected to a cross member, a pair of subframes that can be mechanically fastened such that both are nested to be coplanar in a fixed relation as the backpack configuration, a pair of subframes that can be mechanically fastened such that the planes of each subframe are generally normal with a flexible seat cover as the chair configuration. The conversion into the chair configuration relies on a minimalist, self-intersecting tubular joint method, referred to as a thru joint that does not require additional parts, fasteners, or tools necessary for its use.

A convertible platform for supporting a user in a standing or seated position is presented. In some embodiments, the convertible platform presents a set of front legs and a set of back legs that pivot about a pivot hinge to a preferred angle. The set of front legs and the set of back legs provide a base for supporting various attachment devices. The various attachment devices may comprise attachment members for attaching to base members for supporting the attachment device. The various attachment devices may be configured for supporting infants, toddlers, children, and adults in both standing and sitting positions. Furthermore, various attachments may be connected between the sets of legs for providing steps, platforms, shelves, and seats for the various users and/or objects.

A convertible platform for supporting a user in a standing or seated position is presented. In some embodiments, the convertible platform presents a set of front legs and a set of back legs that pivot about a pivot hinge to a preferred angle. The set of front legs and the set of back legs provide a base for supporting various attachment devices. The various attachment devices may comprise attachment members for attaching to base members for supporting the attachment device. The various attachment devices may be configured for supporting infants, toddlers, children, and adults in both standing and sitting positions. Furthermore, various attachments may be connected between the sets of legs for providing steps, platforms, shelves, and seats for the various users and/or objects.

A seat including a frame and a cover and having a seat surface and a backrest. The frame includes two side profiles lying at a mutual distance and delimiting the seat surface, two side profiles lying at a mutual distance and delimiting the backrest, and an upper profile extending between the side profiles. The seat surface and the backrest are defined by a cloth tensioned between the profiles. This cloth has at an end a folded-back part enclosing the upper profile, and a strap folded round the side profiles for the seat surface. A method for forming such a seat, and a frame and a cloth which are both intended for application in such a seat.

A seat including a frame and a cover and having a seat surface and a backrest. The frame includes two side profiles lying at a mutual distance and delimiting the seat surface, two side profiles lying at a mutual distance and delimiting the backrest, and an upper profile extending between the side profiles. The seat surface and the backrest are defined by a cloth tensioned between the profiles. This cloth has at an end a folded-back part enclosing the upper profile, and a strap folded round the side profiles for the seat surface. A method for forming such a seat, and a frame and a cloth which are both intended for application in such a seat.