Abstract: A demountable bracket, for holding tablet-desks on seats; that consists of a main body (1) that holds the tablet-desk (T) and with a general “L” configuration that has arranged permanently on its horizontal wing (11) a first anchorage part (2) and on its vertical wing (12) a second anchorage part (3); with the particularity that both anchorage parts (2), (3) have respective strategic shapes and are strategically oriented to mount/demount this assembly on a horizontal tube (A1) and on a vertical tube (A2) of the frame (A) of the seat without auxiliary tools or complex handling.

Abstract: A device for connection of a tube to a structure, which consists of an expandable female plug (1) whose outer surface is, at least partially, in contact with the inner surface of the tube (2), the female plug (1) having an orifice (4) in which a moveable male plug (3) is located whose outer surface (8) combines at least partially with the surface (7) of the orifice (4) in the manner of a wedge, having means of tightening by screws (5) to join the male plug (3) to the structure (6) through the female plug (1) with which the tube (2) is joined to the structure (6).