. Journal of electricity, power, and gas . cting between contact and operation of this spring secures the initial contactat the point of removable contact tips, and the final orresting position further along the surface, giving awiping and rocking motion of the fingers, maintaininga positive contact upon which deterioration is a mini-mum. The piston of each cylinder is connectedthrough an insulated joint to the switch arm. On thepiston rod there is an arm holding an interlock seg-ment, securing simultaneous movement of interlockand piston. The air cylinders are bolted to the cylin-der
. Journal of electricity, power, and gas . cting between contact and operation of this spring secures the initial contactat the point of removable contact tips, and the final orresting position further along the surface, giving awiping and rocking motion of the fingers, maintaininga positive contact upon which deterioration is a mini-mum. The piston of each cylinder is connectedthrough an insulated joint to the switch arm. On thepiston rod there is an arm holding an interlock seg-ment, securing simultaneous movement of interlockand piston. The air cylinders are bolted to the cylin-der head, which also forms a shell for valve magnet,this casting having a channel connected with the airchamber to which it is bolted. The-switches are boltedto a substantial base plate bolted to the air chamberframe, the switch bolts forming terminals for motorleads and inter-connections between switches, all con-nections being thoroughly insulated by vulcabestonsleeves and washers. A section of the individual switch units is shownby Fig. Fig. 3. The interlocking switches consist of spring contactfingers sliding on segments and are electrically con-nected with the magnet valve in such manner that theclosing of one switch energizes the magnet of the nextsucceeding one, thus producing automatic progressiveaction. An exterior view of a single unit magnet valveis shown by Fig. 4. When the magnet is energized its armature Isattracted and opens valve from air reservoir to thecylinder. The air reservoir is supplied with air at 70pounds pressure per square inch from the supplement-ary control reservoir. The piston making its strokecompresses the piston spring and closes the switch atthe same time closing or opening- the interlock con- tacts. When the magnet circuit is open the cylinderexhausts to atmosphere and switch opens through theaction of the piston spring. It will be noted that thenormal position of the switch is open, and the failure ofthe air supply or interruption of the cir
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
