Abstract: A star-delta contactor in which a traveling contact is provided with a pair of contact bases which are formed as a slide metal. The contact bases perform a seesaw movement in a direction where their mutual end portions are engaged and are bent at the connection portion in a direction where their mutual end portions are separated, and each of traveling iron cores of two electromagnets m1, m2 has an operation frame for respectively operating a pair of the traveling contact bases, and a spring is provided for respectively separating the traveling iron core when the electromagnet is deenergized.

Abstract: A contactor assembly is disclosed comprising a case having a plurality of serially and vertically sectioned pole chambers, each provided with a traveling contact and a pair of operation frames. A traveling contact bar having right and left arm portion is pivotally fixed on a support frame. The operation frames are installed at right and left positions of the traveling contact, and each frame is provided with a window and a leg portion extending from a lower surface of the frame. A pair of upper and lower contact springs are provided in the window, and the adjacent arm portion of the traveling contact extends through the window and is sandwiched by the pair of contact springs. The pair of right and left operation frames are interlockingly connected at the lower ends of both the legs. An electromagnet is connected to each leg and a return spring is provided on the lower surface of the frame.

Abstract: A switch for shifting between neutral, a delta three phase connection and a star three phase connection that includes three pole chambers, each pole chamber having two separate contact mechanisms, each contact mechanism being activated by means of plate springs, said plate springs being in turn activated by connection to a lever through a cross bar, control plate and bearing arrangement.

Abstract: A high speed switching device constructed in such a way that the casing is formed with a hollow chamber in its inside of the partition wall for separating the poles, and a runner is slidably provided in the hollow chamber, and the runner is made to operate by a lever and plate springs, and the runner is provided with two pieces of projecting elements, and the plate spring is sandwiched, and two pieces of engaging members are provided at a predetermined interval to make the lever engageable, and the plate spring is made to have length sufficient to curve in bow shape with a predetermined degree of arc circle and its both ends are fixed and installed on the upper wall and bottom wall of the hollow chamber by means of the pressure spring, and the runner is shifted in such a way that the lever is engaged with one engaging member and the plate spring is extended in straight condition and exceeds the opposite side slightly from the straight condition and exceeds the opposite side slightly from the straight conditio

Abstract: A process of producing a high molecular weight alkenylphenol polymer which comprises cationically polymerizing an alkenylphenol, such as vinylphenol, in the presence of a nitrile using a cationic polymerization initiator in a homogeneous reaction system. The resulting alkenylphenol polymer is useful as a starting material for preparing a thermosetting resin, a high molecular weight electrolytic substance, an ion exchange membrane, adhesives, glass-fiber-reinforced composite materials, etc.