Abstract: A propulsion system has a substantially tubular housing having an axis, an element generating an electric current, an element generating a magnetic field substantially perpendicular to the electric current, an element forming a duct extending around the axis and arranged so that by interaction of the magnetic field and the electric current a force in a liquid accommodated in the duct is produced and the liquid is moved in the duct around the axis, and at least one insert located in the duct and fixedly connected to a part so that when the liquid is moved it applies a thrust against the insert in a direction around the axis so as to turn the insert and therefore the part around the axis to produce a rotary force which rotates the part around the axis.

Abstract: A propulsion system has a means generating an electric current, an element generating a magnetic field substantially perpendicular to the electric current, an element forming a duct arranged so that by interaction of the magnetic field and the electric current a force in a liquid accommodated in the duct is produced and the liquid is moved, and a shaped element formed so that the moved liquid passes through the shaped element and applies a thrust force to the shaped element in a forward direction and then exits the shaped element to create a reaction force in an opposite direction to provide an additional thrust force applied to the shaped element.

Abstract: A propulsion system has a unit generating electric current, a unit generating a magnetic field substantially perpendicular to the electric current, and a unit forming a duct arranged so that by interaction of the magnetic field and the electric current a force in a liquid accommodated in the duct is produced and the liquid is moved to apply a thrust. The unit forming a duct is formed as a closed duct so that the liquid circulates in the duct and does not escape from it.

Abstract: A cutting element comprises at least one cutting member, a handle arranged for holding the cutting member, and a casing surrounding the cutting member so that in an operative position a cutting blade of the cutting member is exposed while in an inoperative position it is confined in the casing, the casing being movable relative to the cutting member so as to sharpen the blade of the cutting member.

Abstract: A safety razor comprises a handle, a blade element movable relative to the handle in a direction which substantially corresponds to the direction of a working stroke, and an elastic element located between the handle and the blade element as considered in this direction.

Abstract: A vessel such as a ship, a boat and the like, comprises a main part having a hull with an inner hollow and a substantially vertical fixed support fixedly connected with the hull, and a stabilizing element located in the inner hollow and cooperating with the fixed support so that when the main part turns about a horizontal axis in a first direction under the action of waves, wind and the like, the stabilizing element urges to turn the main part back about the same horizontal axis in a second direction which is opposite to the first direction so as to stabilize the ship.

Abstract: A safety razor, comprises a handle element, a blade-carrying head element provided with at least one blade, a rotatable element having an axis and connected with the head element so as to rotate relative to the head element but jointly move in an axial direction, and a unit for imparting to the rotatable element a movement in the axial direction in response to contact of the rotatable element with a surface to be shaven, so that when user moves the handle element and therefore the head element in a predetermined direction during shaving, the rotatable element and therefore the head element of the blade is displaced in a direction which is tranverse to the predetermined direction in response to rotation of the rotary element, the imparting unit including a shaped grove provided in the rotary element and a spherical member arranged between the handle element and their rotatable element and movably engageable in the groove of the rotatable element.

Abstract: A safety razor comprises a handle, at least one blade, a head element arranged to carry the blade, and a rotary element arranged to rotate in response to contact with a surface to be shaven during connected with the head element so that when a user moves the handle element and therefore the element in a predetermined direction during shaving the head element and therefore the blade is displaced in a direction which is transverse to the predetermined direction in response to rotation of the rotary element.

Abstract: A vessel, such as a ship, a boat and the like, comprises an inner hull having a longitudinal horizontal axis and a transverse horizontal axis, an outer hull surrounding the inner hull and arranged movable relative to the latter about at least one of the horizontal axes, and a plurality of ball bodies arranged between the inner hull and the outer hull so as to allow the movement of the outer hull relative to the inner hull about the at least one horizontal axis.

Abstract: A vessel, such as a ship, a boat and the like, comprises a hull having an inner hollow, a movable body located in the inner hollow of the hull, and device for guiding the movable body in the inner hollow of the hull and formed so that when the hull turns about any horizontal axis in a first direction under the action of waves, wind and the like, the body urges to turn the hull back about the same any horizontal axis in a second direction which is opposite to the first direction so as to stabilize the ship.

Abstract: A ship has a whole hull with an inner hollow and a longitudinal axis, and a body which is arranged in the inner hollow of the hull so that when the wind, waves and the like turn the hull in a first lateral direction, the body urges the hull to move in a second lateral direction which is opposite to the first lateral direction so as to stabilize the ship.

Abstract: A boat has a body, a mast arranged on the body so that under the action of a wind force component acting in a first lateral direction transverse to a longitudinal axis the mast turns relative to at least a portion of the body in a first lateral direction, and an element which resists the turning of the mast in the first lateral direction and urges the mast to turn in a second lateral direction which is opposite to the first lateral direction.

Abstract: A wheel for a vehicle has an inner driving element with an outer circumferential surface and an outer driven element with an inner circumferential surface, wherein the outer circumferential surface of the inner driving element has a smaller diameter than the inner circumferential surface of the outer driven element, and thereby the outer driven element is arranged loosely on the inner driving element and has a contact with the latter over a small circumferential region.

Abstract: A mechanical pencil, especially for thin leads, in which a tubular guide projects from and is guided for movement in axial direction in one end of a tubular casing. Lead is automatically advanced through the casing as a function of pressure exerted on the tubular guide during writing or drawing by successively compressing and expanding a tubular, resilient element having a conically-shaped end. During writing or drawing, the resilient element is compressed and its conically shaped end is wedged in tight engagement into a cooperating conically shaped end of an abutment member so as to clamp lead passing through the casing, thereby preventing the lead from moving inwardly during writing. When pressure is terminated, the resilient element is restored to its expanded condition, thereby freeing the lead to advance.