Abstract: At least one slide block is installed on the saddle pole for optimal guiding, as far as possible free of play, of a saddle pole in a cladding tube, at the lower end of the saddle pole. The slide block(s) engage in a groove-shaped recess in the cladding tube, said groove-shaped recess of the cladding tube having at least one length, which corresponds to the requested adjustment stroke of the saddle pole. At least one contact surface of the saddle pole, on which a planar slide block is installed, is planar and the side of the planar slide block, which is installed on the saddle pole with the planar contact surface, also has a planar surface.

Abstract: A safety helmet, in particular for cyclists, includes a self-contained portable semi-shell helmet (H), on which an integral part (1) enclosing the chin and the occiput/neck area can be fixed in a detachable way. The semi-shell helmet (H) is equipped as a self-contained helmet with a chin strap fastening and all that belongs to known helmets, This hence enables, depending on the intended use, only to wear the upper helmet part or the assembled integral helmet.

Abstract: At least one slide block is installed on the saddle pole for optimal guiding, as far as possible free of play, of a saddle pole in a cladding tube, at the lower end of the saddle pole. The slide block(s) engage in a groove-shaped recess in the cladding tube, said groove-shaped recess of the cladding tube having at least one length, which corresponds to the requested adjustment stroke of the saddle pole. At least one contact surface of the saddle pole, on which a planar slide block is installed, is planar and the side of the planar slide block, which is installed on the saddle pole with the planar contact surface, also has a planar surface.

Abstract: The invention relates to a height adjustable saddle pole consisting of two tubes which are telescopically slidable into another, that is to say a cladding tube for accommodating a saddle support tube, whereas the saddle support tube is spring-loaded and is fixed in position via a locking pin. The bores into which the locking pin engages, are located in the region of the smallest stress of the saddle support tube in order to weaken the static of the saddle support tube as little as possible.