Abstract: A pneumatic pulverizer comprises an accelerating pipe for conveying and accelerating powder by a high pressure gas, a pulverizing chamber and an impinging member which pulverizes the powder jetted out from the accelerating pipe through impinging force. The impinging member is provided in the pulverizing chamber as opposed to the accelerating pipe outlet and the impinging member has an impinging surface with a tip portion having a conical shape with an apex angle of 110.degree. to 175.degree.. In this way, powder is pulverized at the impinging surface of the impinging member and dispersed substantially in the entire circumferential direction after impinging and the powder dispersed may impinge secondarily on the wall of the pulverizing chamber.

Abstract: A toner for producing electrostatic latent images is produced by classifying a pulverized feed material into a coarse powder and a fine powder in a first classifying means, pulverizing and recycling the coarse powder to the first classifying means, introducing the fine powder into a multi-division classifying chamber divided into at least three sections where the fine powder is classified into at least a coarse powder fraction, a medium powder fraction and a fine powder fraction. The medium powder fraction is recovered to provide a toner. The coarse powder fraction is recycled to the first classifying means.

Abstract: A process for classifying toner particles supplied through a supply nozzle into at least three fractions in a classifying chamber divided into at least three sections and placed under a reduced pressure under the action of the inertia force of the toner particles supplied together with a gas stream and the centrifugal force of the curved gas stream due to Coanda effect. A first gas introduction pipe and a second gas introduction pipe are disposed above the classifying chamber so as to provide a first inlet and a second inlet opening with the first inlet being disposed closer to the supply nozzle than the second inlet. The absolute values of the static pressures P.sub.1 and P.sub.2 in the first and second gas introduction pipes are controlled so as to satisfy the relations of: .vertline.P.sub.1 .vertline..gtoreq.150 mm.aq., .vertline.P.sub.2 .vertline..gtoreq.40 mm.aq. and .vertline.P.sub.1 .vertline.-.vertline.P.sub.2 .vertline..gtoreq.100 mm.aq.

Abstract: A gas generator including a combustible composition is covered with a guard member, which is adapted in shape to the gas generator and has slits, notches or folds arranged such that the member is locally extended outwards upon actuation of the gas generator to prevent contact of the bag with the heated gas generator.

Abstract: A gas generator including a combustible composition is covered with a guard member, which is adapted in shape to the gas generator and has slits, notches or folds aranged such that the member is locally extended outwards upon actuation of the gas generator to prevent contact of the bag with the heated gas generator.