Abstract: A gas generator for air bags is provided which includes a first outer shell and a second outer shell, each having a circular part and an outer wall formed along the outer periphery of the circular part. A gas generating device is installed in the hollow portion formed within the outer shells. Openings for communicating the hollow portion with an air bag are provided. A plurality of concentric wall members axially extending from the circular part of the first outer shell and a plurality of concentric wall members axially extending from the circular part of the second outer shell, located at positions corresponding to the outer wall members of the first outer shell define circumferential chambers within the gas generator. Gaps are formed between terminal end surfaces of opposing outer wall members whereby gases produced by the gas generating device on receiving impacts flow through the generator and are introduced into the air bag to protect a passenger from impacts.

Abstract: In a system for measuring torque, torsional vibrations and power, emitters and sensors are arranged on at least one rotating shaft. From one of the frequencies (f.sub.1 or f.sub.2) of the signals (S.sub.1 or S.sub.2) of the sensors, a new signal (S.sub.3) is generated whose frequency (f.sub.3) corresponds to the sum or difference frequency of the frequencies (f.sub.1, f.sub.2), and which is phase-locked to the signal (S.sub.1 or S.sub.2) from which it is generated. The relation of the initial phase of the new signal (S.sub.3) with the frequency-generating signal (S.sub.1 or S.sub.2) is determined also by the other signal (S.sub.2 or S.sub.1). The signals (S.sub.1, S.sub.2) and the new signal (S.sub.3) are fed to a multiplier. The measure of the torsion-dependent twist of the emitters with respect to each other, from which the torsional vibration signal can be derived, is determined by integration of the signal (S.sub.1.S.sub.2.S.sub.

Abstract: An arrangement for the production of straight-line symmetrical signals from at least two signal generators, which have a periodic structure and which are movable relative to one another, by means of sensors that generate signals corresponding to the position of the signal generators, wherein at least two sensors are provided for at least one of the two signal generators with the output signals of the two sensors being combined in a subtraction or addition stage. The two sensors are positioned to be offset with respect to each other by one half period of the structure of signal generator or by an integer multiple of such period.