. Locomotive engineering : a practical journal of railway motive power and rolling stock . ched the cable used to pull the signalto danger, the blade being made of cast-iron, which considerably overbalances theweight of the spectacle arm on the op-posite end. The slide when in its normalposition, or raised as shown in the figure,(its in a groove cut in the head of theswitch-shaft and locks it, preventing theswitch from being opened until the slide ispulled down. This is done by raising theswitch-lever handle, an arm projectingthrough the yoke and engaging with a lugon the slide, pulling it dow
. Locomotive engineering : a practical journal of railway motive power and rolling stock . ched the cable used to pull the signalto danger, the blade being made of cast-iron, which considerably overbalances theweight of the spectacle arm on the op-posite end. The slide when in its normalposition, or raised as shown in the figure,(its in a groove cut in the head of theswitch-shaft and locks it, preventing theswitch from being opened until the slide ispulled down. This is done by raising theswitch-lever handle, an arm projectingthrough the yoke and engaging with a lugon the slide, pulling it down, and with itthe signal to the danger position, when theswitch can be thrown. To interlock the T-crank operating thedistant with the home signal, the upper the distant signal cannot be cleared untilafter the slide has been raised, which oc-curs only when the home signal goes to thesafety position after the switch has beenclosed. The ingenious arrangement used at thedistant signal for automatically compen-sating the expansion and contraction ofthe wire, so as to always bring the signal. lXLOCKING SWITCH. down to the same angle with the vertical,is shown in figure 11. The two lines ofwire from the interlocked stand are at-tached to a loose lever hung on two pinsfastened in the opposite arms of a T-crank,the middle arm having attached to it thepipe connection to the signal casting, this LOCOMOTIVE ENGINEERING. 327 signal being of the usual construction andweighted to go to danger when an\ partbecomes disconnected or breaks. Shoulda wire break, the tension of the other wirewould pull the loose lever off from the T-crank and leave it free for the signal to goto danger by gravity. To take up expansion and contraction ofthe wire lines, the T-crank, instead of beingbolted to a rigid foundation, is fastened toone end of a crank, the other or longer
Size: 1438px × 1737px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
