. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . this opens the smallpoppet valve, referred to above. Air therefore flows into the M-in. pipe lead-ing to the air end of the spring case. Theair pressure so introduced moves thesmall piston and compresses the springin its case. In consequence of this, thebolt from the spring case moves back andthrough its connections, loosens the pivot-ed locking bar under the crosshead. The hinged lock bar or guide mustclear the pivoted shoe on the crossheadby % in. in its parellel position with themain guide
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . this opens the smallpoppet valve, referred to above. Air therefore flows into the M-in. pipe lead-ing to the air end of the spring case. Theair pressure so introduced moves thesmall piston and compresses the springin its case. In consequence of this, thebolt from the spring case moves back andthrough its connections, loosens the pivot-ed locking bar under the crosshead. The hinged lock bar or guide mustclear the pivoted shoe on the crossheadby % in. in its parellel position with themain guide, so that it takes an inclined motion through the floating lever, shownvertically in central position in our il-lustration, with the crosshead connectionto it as a fulcrum, and this movementopens the operating valve. The motionof the crosshead which follows, trans-mits motion through the floating leverwith the handlever connection as a ful-crum, and closes the valve when the gearis stopped and gripped by the lock at thecorresponding position of the any movement in either direction of. MELLIN PNEUMATIC GEAR. position when locked; giving more in-clination when the crosshead is at theinner end of the stroke, and any slightvariation in leverage action which existson the crosshead by the locking guide inand between these positions, is compen-sated for by the variations in tension ofthe locking spring, thus securing an ap-proximately uniform locking pressure onthe crosshead for any position of itsstroke. The operating valve, placed in thecentre, below the cylinder, is of the rotarytype, having lap and passages like an or-dinary slide valve but without any stuf-fing box. In raising the handlever latch in theusual way, the latch valve automaticallyadmits air into the locking cylinder andreleases the lock by compressing thespring and remains so until the latch isagain dropped and the lock becomes movement of the handlever transmits the handlever this action
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Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
