Abstract: The invention comprises a trolley with an frame (1) with wheels (10, 11) and at least one handle (5), which is characterized in that the frame (1) comprises: a main supporting rod (2), equipped with the handle (5) at the upper end, and at least one wheel (11) at the lower end; a sub-supporting rod (7), fastened at its upper end to the main supporting rod (2) between the extreme ends of the main supporting rod, and equipped with at least one wheel (10) at the lower end; and wherein the wheels (11) are fastened to the main supporting rod via a first crosspiece (4) and/or where the wheels (10) are fastened to the sub-supporting rod via a second crosspiece (9).

Abstract: Device (1) for height adjustment of a module, such as a children's seat (3) on a stem (2) in a trolley or a chair, characterized in that the locking device (1) comprises a movable casing (4) which partly or completely surrounds the stem (2), a friction element (5) and a handle (6) which rotates eccentrically in order to tighten the friction element (5) against the stem (2) and providing friction between the locking device (1) and the stem (2). The children's seat (3) may comprise a footrest (20) characterized in that two rails (21) are received in guides (22) integrated in the seat, such that the footrest (20) may be displaced telescopically in relation to the seat (3).

Abstract: Locking device for a telescopic stem for a trolley wherein the stem comprises an inner stem and an outer stem, which may glide into each other, characterized in that a friction element is arranged in the outer stem and that the inner stem is equipped with the blocking element grasping into the friction element and locking the movement of the inner stem in relation to the outer stem, in that the blocking element presses against the friction element of housing with a conical groove linked to a rod stretching from the housing to the upper end of the inner stem and connected to a handle which influences the position of the housing.