Locomotive appliances . the engineers hand,and may readily beopened without pullingthe whistle cord. While steam pressuremay be used to operatethis and other bellringers, air pressure ismuch preferable, espec-ially in cold climates. The construction andits action are as follows,as may be seen by ref-erence to Fig. 3: Thereare two openings nearthe bottom for pipes; theupper one is the inlet,the lower is the is admittedthrough the upperopening, opposite anannular groove in valve18, through which fourholes are drilled, admit-ting the pressure underthe single acting piston LOCOMOT
Locomotive appliances . the engineers hand,and may readily beopened without pullingthe whistle cord. While steam pressuremay be used to operatethis and other bellringers, air pressure ismuch preferable, espec-ially in cold climates. The construction andits action are as follows,as may be seen by ref-erence to Fig. 3: Thereare two openings nearthe bottom for pipes; theupper one is the inlet,the lower is the is admittedthrough the upperopening, opposite anannular groove in valve18, through which fourholes are drilled, admit-ting the pressure underthe single acting piston LOCOMOTIVE APPLIANCES 309 10 ; this causes piston 10 to rise, forcing the bellto swing. Piston 10 has a stroke of one and one-fourth inches when at its extreme travel; crank 2has a stroke of four inches. The connecting rod is intwo sections, 6 and 7 , which allows the crank 2 tomake a complete revolution without causing piston 10to move. When the ringer is started to work thepiston 10 will be driven upward, causing the bell to. Fig. View of Bell Ringer. swing,.and valve stem 17 will raise valve 18, closinginlet port, and use pressure expansively by travelingthe length of the lap before the lower edge o( valve 18will open the exhaust port, The bell, having receivedan impulse, will continue its motion after the piston 10has reached the upper end of its stroke, the crank box6 sliding on rod 7. The impetus which the bellreceives being expended, it will tall; the set bolt 4 will 310 LOCOMOTIVE APPLIANCES. strike the end of rod 7, and piston 10 will be forceddownward (being open to the exhaust below), comingin direct contact with valve 18 , thereby closingexhaust port and opening inlet port after cushioningon the pressure remaining under piston 10 subsequentto the closing of the exhaust onaccount of the exhaust port beingplaced slightly above the bottom ofthe cylinder. It will be seen thatvalve 18 is only operated at theterminations of the piston 10 rings 15 on the pis
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectlocomot, bookyear1901
