Abstract: A roof-cleaning device for moving side windows of a convertible vehicle an appropriate distance clear of a roof hinged to the vehicle body, and capable of detecting an event in or in the surroundings of the vehicle, includes: a first motion detector designed to occupy a first operational state and a second standby state, and a second detector coupled to the first detector and of lower power consumption, wherein I. with the first detector in the standby state, if the second detector detects an event to which it is sensitive, then the first detector switches into the operational state so that it can play a part in moving the window clear of the roof, II. and if, while in this operational state, the first detector detects the presence, intervention or action of the individual, then the windows are rolled down before the door is, or can be, opened.

Abstract: A roof-cleaning device for moving side windows of a convertible vehicle an appropriate distance clear of a roof hinged to the vehicle body, and capable of detecting an event in or in the surroundings of the vehicle, includes: a first motion detector designed to occupy a first operational state and a second standby state, and a second detector coupled to the first detector and of lower power consumption, wherein I. with the first detector in the standby state, if the second detector detects an event to which it is sensitive, then the first detector switches into the operational state so that it can play a part in moving the window clear of the roof, II. and if, while in this operational state, the first detector detects the presence, intervention or action of the individual, then the windows are rolled down before the door is, or can be, opened.

Abstract: A sensor system includes a coil positioned on a thin substrate sandwiched to a layer of mumeta, a high magnetic permeability material. The mumetal acts as an amplifier for the inductance L measured at the terminals of the coil. When a magnet passes in front a sheet of mumetal, its magnetic field locally saturates the mumetal whose magnetic permeability collapses on the saturated surface. The result is a reduction of the inductance factor (L) in proportion with that area of the coil covered by the saturated mumetal. This reduction in inductance is measured at the coil terminals to provide an estimation of that area of the coil that has been covered. By determining a particular layout of the coil, mumetal, and magnet, a predetermined electrical signal of inductance or coupling variations corresponding to movement of the magnet is provided.

Abstract: A method of folding an air-bag is disclosed. The air-bag is initially located in a substantially flat condition. Two side portions of the air-bag are rolled inwardly towards the gas generator and are then folded back (9, 10) towards the centre of the air-bag, thus releasing tension in the upper layer of fabric between the two rolls. The rolled regions are then themselves rolled inwards form the opposed ends thereof and are again finally turned back, again to release any tension in the central region of the fabric. Consequently, the central region of the fabric, which is located opposite the gas generator, is slack, enabling that part of the fabric to move away from the gas generator relatively easily when the gas generator is activated.