Railway and Locomotive Engineering . position Bthe elevator is at the extreme upper limitof its throw, which is J4-inch above theline of shovel travel, and the shovel hasadvanced well over its upper surface. Inorder that the two parts may not come incontact the heel or back side of the shovelis higher than the front on the under sur-face and the top of the elevator is cut awayso as to make it slightly concave. From this point the elevator is falling,and so, in order that it may not get toofar awav from the bottom of the shovel. center, the elevator has dropped to thelevel of the line of shovel
Railway and Locomotive Engineering . position Bthe elevator is at the extreme upper limitof its throw, which is J4-inch above theline of shovel travel, and the shovel hasadvanced well over its upper surface. Inorder that the two parts may not come incontact the heel or back side of the shovelis higher than the front on the under sur-face and the top of the elevator is cut awayso as to make it slightly concave. From this point the elevator is falling,and so, in order that it may not get toofar awav from the bottom of the shovel. center, the elevator has dropped to thelevel of the line of shovel action and theshovel has moved across the whole face ofthe elevator and picked up all of the coalfrom its surface. Then, as the empty elevator movesdown, the shovel advances through thedoor of the firebox, distributes the coaland returns to its stationary position, asalready described. Under ordinary working conditions, theelevator makes about 40 strokes perminute and delivers from 3 pounds to 5pounds of coal to the shovels at each. I ?// /o- POSITIONS SHOWN IN ELVIN MECHANICAL STOKER stroke, dependent upon the rate at whichit is fed into the hopper at the back ofthe screw conveyor. As all parts are geared together thereis no possibility of any variation in the October, 1921 RAILWAY AND LOCOMOTIVE ENGINEERING 263 synchronism of their action and theshovels are housed in a box which pro-tects them from accident and preventsany one from being struck by them orby chance flying particles of coal. Thisbox has a floor about J4-inch below theline of travel of the shovels, and is closedby a hinged cover by which the flow ofair through the door openings into thefirebox is cut off. One of the most interesting features ofthe stoker mechanism is the engine whichis used to drive it. It is of unique designand of a remarkably compact construction. Its working parts consist of two pistons,one working within the other and withmovements at right angles to each engrav
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyork, bookyear19
