. Railway master mechanic [microform] . ried by means of thereversing rod, arm and suspension link. The lap and leadlever is attached at one end to the crosshead by means ofa radius link, and at the other end to a small crosshead onthe valve rod. The point on the lap and lead lever at whichthe radius rod, d, is attached is determined by the designerand is at the right point to give the valve enough travel toovercome lap and lead through the motion of the cross-head alone with the radius rod in mid-position. It willalso be seen that the valve is in the same position of leadat beginning of strok
. Railway master mechanic [microform] . ried by means of thereversing rod, arm and suspension link. The lap and leadlever is attached at one end to the crosshead by means ofa radius link, and at the other end to a small crosshead onthe valve rod. The point on the lap and lead lever at whichthe radius rod, d, is attached is determined by the designerand is at the right point to give the valve enough travel toovercome lap and lead through the motion of the cross-head alone with the radius rod in mid-position. It willalso be seen that the valve is in the same position of leadat beginning of stroke with full gear forward or is the main feature of this gear. The relative posi-tions of the pins during a revolution forward are pointed outin Figure 1, and in order to more thoroughly understandthis feauture let us follow the motion through one revolu-tion. In Figure 1, we have the positions at the beginningof a forward stroke moving forward. The valve crank pinis advanced ahead of the main crank pin 90° for mid-travel. Fig. 2. 482 RAILWAY MASTER MECHANIC December, 1909
Size: 2931px × 853px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
