Abstract: Process of producing front commutators for the rotors of direct current machines. A linear shaped copper strip is formed, the shaped strip incorporating a plurality of serially connected commutator segment halves. After the formation of the shaped strip it is alternately bent in an upward direction and in a downward direction to form a intermediate product in which the upper surfaces of the segment halves of each pair thereof are pressed together. The resulting intermediate product is then bent into a circle so that there is formed a commutator ring with a plurality of confronting pairs of segment halves disposed in radial directions. Between the bent, initially upper shaped parts of the shaped strip there are formed slots for the reception of the rotor winding between confronting segment halves; and between the bent, initially lower linear parts of the shaped strip there are formed air gaps between the consecutive segments of the commutator.

Abstract: A body for a container or for a road or rail vehicle. The body comprises an inner tube formed of a wound laminate of synthetic resin impregnated material; an outer tube formed of a wound laminate of synthetic resin impregnated material and spaced from the inner tube, an insulation material and reinforcing material in the space between the tubes, the tubes insulation material, and reinforcing material all being securely interconnected. The synthetic resin impregnated material preferably comprises filaments and/or fabric.