. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . BUTTERFLY FIRE DOOR. door is fully open. Baffle plates are fittedto the door plates, and protect the doorplates from the intense heat of the fire-box. They also serve to heat the air thatpasses through the openings in the doorplates. This not only aids combustion, buthelps to maintain a more uniform fire-boxtemperature. It will be observed in thefirst illustration there is a hand lever, thepurpose of which is for operating thedoors in the roundhouse when there is noair pressure on the engine.
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . BUTTERFLY FIRE DOOR. door is fully open. Baffle plates are fittedto the door plates, and protect the doorplates from the intense heat of the fire-box. They also serve to heat the air thatpasses through the openings in the doorplates. This not only aids combustion, buthelps to maintain a more uniform fire-boxtemperature. It will be observed in thefirst illustration there is a hand lever, thepurpose of which is for operating thedoors in the roundhouse when there is noair pressure on the engine. When thedoor is operated by air pressure this lever does not move. In general service, as wehave already stated, the door is operatedby air pressure, the air being admittedthrough a strainer valve and an adjustablevalve into the operating valve. When thefoot of the operator is placed upon thetread, a valve is opened at the lower partof the door, being raised from its seat,. DETAILS OF1 FRANKLIN PNEUMATICAL-LY OPERATED FIRE DOOR. allowing the air pressure to pass througha pipe which connects the valve to thecylinder head. The enclosed piston is car-ried forward by the action of this airpressure, and transmits its movement tothe doors through a link which is at-tached to the left hand door plate. Theplates are connected by intermeshing gearteeth. As the piston moves forward the doorplates are rotated around the fulcrumpins until they have uncovered the open-ing in the door frame. In this positionthe link is centered, and it is impossibletor the piston to travel any the momentum of the door platesbe such as to carry the doors beyond thefull opening position the piston would ln-pulled back against the air pressure inthe cylinder. This would act as a cushionand bring the doors to a stop withoutany jar or noise. When the foot of the, operator is re-moved from tread the valve closes, cuttingoff air pressure to the cylinder, at thesame time permit
Size: 1628px × 1534px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
