. Railway track and track work . ; Hartford Ry. putsthem alternately on the inside and outsideof its 100-lb. rails, so as net to have all thebolt necks on one side, and to prevent de-railed wheels frcm breaking all the bolts ofthe joints. A nut-lock is usually placed be-tween the. nut and the bar, to pre-vent the nut from slacking. Lock nuts, however, render these un-necessary, and thus reduce the number of parts. The. Harvey grip-threadbolt has a ratchet thread, undercut on the bearing side, or about 5° lessthan a right angle to the axis of the bolt. The nut has a similar thread, thebearing s
. Railway track and track work . ; Hartford Ry. putsthem alternately on the inside and outsideof its 100-lb. rails, so as net to have all thebolt necks on one side, and to prevent de-railed wheels frcm breaking all the bolts ofthe joints. A nut-lock is usually placed be-tween the. nut and the bar, to pre-vent the nut from slacking. Lock nuts, however, render these un-necessary, and thus reduce the number of parts. The. Harvey grip-threadbolt has a ratchet thread, undercut on the bearing side, or about 5° lessthan a right angle to the axis of the bolt. The nut has a similar thread, thebearing side of which is about 5° greater than a right angle to the axis ofthe nut. The thickness of face of thread and depth between threads is in-creased towards the outer end of the nut by flattening the angle of thethread. When the nut is hard against the splice bar, the thin sharpthreads of the bolt are upset so as to fill the space of 10° between thethreads of the bolt and the nut. The hole in the nut is enlarged at the. SectionA Section SectionB. E-F. C-D. New York Central Ry. Fig. 45.—Track Bolts. LofC. 100 TRACK. bearing face, forming a chamber 3-16-in. deep; thus ensuring good threadsto screw the nut upon in taking up any slack. The Oliver or Holdfastnut has the three outer threads of the ratchet form and cut at a slightlydifferent angle from the others, thus setting up a tight grip on the bolt. TheNational elastic nut is made from a flat strip so shaped as to form a dove-tail, scarf or halved joint when bent into a ring. The rough ring is thenpressed into hexagon form and tapped slightly smaller than the bolt, sothat when put in with a wrench it opens about 1-64-in. at its joint and ex-erts a grip on the bolt. The nut can be easily slackened or tightened, andcauses no injury to the threads of the bolt. The Automatic nut is of Tshape, the wings being slightly curved to act as a spring. The bolt is
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
