A plastic tension bracket clamp is used to prevent the table legs from unintentionally unfolding. It allows a guided movement of the steel tension bracket and locks twice, to prevent the desk legs from unintentionallyunfolding when collapsed and from unintentionally folding down when opened. It is also fitted with an intuitive push button so that the desk can be easily handled. Whilst the table is folding out, the swivel joint ensures that the leg frames move sideways in opposite directions and align themselves symmetrically to the desktop when unfolded. When folded up, the leg frames are asymmetrical to the desktop so that the even the desks of small dimensions can be stacked in a space-saving way