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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
ratable tables K K, which are moved out of the way to allow the rail to rest upon intermediate bearings in straightening short bends. Drop-press for straightening Railroad-rails. Fig. 5942 has grooved vertical rollers I′ L fitting the head of the rail, and flat rollers corresponding to its bottom; horizontal rollers above and below are grooved to correspond with its sides. As it passes between these its curvatures are rectified. See also patents: — Anderson, Au 29, 1848.85,917.Downing, Jan. 19, 1869. 39,876.Bolton, Sept. 15, 1863.124,867.White et al. March 19, 1872. 47,208.Johnston, Apr. 11, 1865.125,055.Knizel, March 26, 1872. 62,669.Nelson, March 5, 1867. Fig. 5943 is for straightening shafts or bending iron of round or other section. The shaft is supported on two rests, and pressure applied by means of a lever and screw mounted on a carriage, which may be traversed on the bed of the machine, so as to act at either extremity as well as in the center. Machine