. Railway mechanical engineer . oper alinement of the operating post. Tothe outer end of the post is keyed a short arm. in the upperend of which is a slot working over a hardened block on thereverse lever. The reverse lever has no fixed pivot. The initial move-ment of the lever is pivoted about its lower end, where it ispinned to the back end of the reach rod. The extent of thismovement is limited by a special tap bolt in the valve seat,the head of which extends up into the admission port in thevalve and permits the valve to move in either direction onlysufficiently to register with the admiss
. Railway mechanical engineer . oper alinement of the operating post. Tothe outer end of the post is keyed a short arm. in the upperend of which is a slot working over a hardened block on thereverse lever. The reverse lever has no fixed pivot. The initial move-ment of the lever is pivoted about its lower end, where it ispinned to the back end of the reach rod. The extent of thismovement is limited by a special tap bolt in the valve seat,the head of which extends up into the admission port in thevalve and permits the valve to move in either direction onlysufficiently to register with the admission ports in the valveseat. If the movement of the lever is forward, air is ad-mitted to the rear end of the cylinder and immediately causesa forward movement of the piston. This is communicatedto the lower end of the lever through the stroke lever F andthe reach rod, and permits the continued movement of theupper end of the lever in a forward direction. During thispart of the motion the lever is pivoted about the control valve. The Quadrant and Valve Housing with the Rotary Valve Removed connection and is retained in its proper location relative tothe quadrant by means of the reverse lever guide E. Thisguide is a sleeve mounted on the valve housing, about whichit is free to revolve. When the desired movement of thereverse lever is completed and the lever latched, the latch onthe quadrant becomes the fixed point in the further move-ment of the lever necessary to lap the valve. The quadrant is notched for 30 cut-off positions each inforward and back motion, a ven,- fine adjustment thus beingprovided. There is a spring latch D on the reverse lever 7W 708 RAILWAY MECHANICAL EXGINEER Vol. 91, No. 12 which operates underneath the quadrant to indicate when thelever is in central position. This assists the hostler in locat-ing the center of the motion with certainty. Wlien there is no air pressure on the reverse gear, thelever can be moved only slightly; it is impossible for it
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
