. American engineer . rcpcl. I he smallest bore of the cup is large enough to go over theeiil:irged end of the piston rod. The carrying rings are madein halves when the piston rod has an enlarged crosshead lit, butin nihcr cases they are in one piece. Of the three packing rings,two are alike, but may be of ditTerent thickness to facilitate as-sembling. Packing ring / consists of two symmetrical pieceswith a flattened portion as shown, the flat part covering thejoint or opening. These flat parts form the two bridge seats;liesides being flattened on the outside the halves are cut out Ynin. to al
. American engineer . rcpcl. I he smallest bore of the cup is large enough to go over theeiil:irged end of the piston rod. The carrying rings are madein halves when the piston rod has an enlarged crosshead lit, butin nihcr cases they are in one piece. Of the three packing rings,two are alike, but may be of ditTerent thickness to facilitate as-sembling. Packing ring / consists of two symmetrical pieceswith a flattened portion as shown, the flat part covering thejoint or opening. These flat parts form the two bridge seats;liesides being flattened on the outside the halves are cut out Ynin. to allow an opening and closing movement. On the twobridge seats are placed bridges of exactly the same width as thering, and having an outside radius corresponding to the ringitself. Each bridge has a lug to engage in the slot in the cupand prevent the ring from turning. The bridge extends almostacross the flattened seat wdien the ring is closed, but each halfring can slide under the seat t the small extent allowed bv the. Assembled / and Bridge Pieces. Smith Metallic Packing as Applied to a Wabash Locomotive. cup. When steam is admitted through the slots in the cupagainst this ring, it will close around the piston, the ends ofthe two halves approaching each other. Rings 3 and S are alsomade in halves, with 3/16 in. cut out to allow for opening andclosing. Each of these halves has a half round cut in its outsidecircumference to correspond with two of the slots in the cup,so that a simple round bridge piece engaging the slots in thecup and these half rings holds them from turning in the two round bridges fit loosely and should be slightlyshorter tlian the combined width of the two rings, so as not tohold the rings apart. Rings 2 and $ are placed in the cup soas to break joints with each other, and also with ring /. Thereis no pressure on the rings when steam is shut off and the cupand rings as a whole float about the rod, the carrying rings sup-porting the cup
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
