A corner bracket for connecting a leg with a first furniture part and a second furniture part of a piece of furniture is disclosed. The corner bracket includes an upper part and a lower part. The upper part includes a first side portion and a second side portion each having an integrally formed engaging member with an end section configured to engage an internal side of the first furniture part or the second furniture part, respectively. The upper part includes a securing member configured to receive a fastening member of the leg. The lower part includes a through opening configured to be aligned with the securing member and to receive the fastening member of the leg. In use the end section of each engaging member extends at least to some extent downwards towards the respective internal side of the first and second furniture parts.

A mattress support assembly includes a rectangular frame having side rails and footboard and headboard rails; a connector assembly in each corner of the frame internally connecting each side rail to the footboard rail and to the headboard rail; a leg disposed under each corner of the frame, each leg having three bars in a Cartesian arrangement, with an angle of 90 in the horizontal plane being defined between a first bar and a second bar, while a third bar projects in the orthogonal direction to the horizontal plane, each of the first bar and the second bar having a threaded pin, and each threaded pin projecting orthogonally in relation to the horizontal plane and in the opposite direction in relation to the third bar.