Abstract: A tire pressure sensor to be fastened to a rim of a vehicle wheel for sensing an inflation pressure of a tire mounted on the rim, the tire pressure sensor comprising a reference pressure chamber having a gas filled reference pressure volume, an electrically conductive diaphragm for sealingly separating the reference pressure chamber at a tire interior, a sensor electric circuit, a contact pin located in the reference pressure chamber and cooperating with the electrically inductive diaphragm for closing the sensor electric circuit when the tire inflation pressure is at a predetermined value, and an additional pressure chamber communicating with the reference pressure chamber and deformable to change the reference pressure volume therein to thereby establish a predetermined reference pressure in the reference pressure chamber.

Abstract: The slats which are disposed at the bottom of the air outlet are rotatably mounted and have vanes which define an angle therebetween of other than 180.degree.. The slats can be adjusted to a desired angular position and fixed by threaded screw connections. The adjustment of the slats permits the direction of the discrete air streams issuing from the outlet to be controlled.

Abstract: A filter for cleaning large quantities of contaminated gas, wherein the gas to be cleaned is passed through a filter medium which is spanned onto a drum. The retained contaminants are removed by a device which wipingly passes over the filter medium. The drum is fixedly connected with a conduit or line through which there is conducted the contaminated gas. The removal device comprises a compressed gas-blast device equipped with at least one jet nozzle and movable over at least part of the outer surface of the drum surrounds the periphery of such drum. The jet nozzle is directed towards the surface of the filter medium. Means serve for the withdrawal of the separated contaminants from the internal hollow space or compartment of the drum.