. Railway mechanical engineer . OLWORK The pillar crane, the details of which are shown in the en-graving, was designed especially for serving machine tools. It is»ery simple in construction and is easily rotated in the base. Thepillar is a piece of 6 in. extra heavy pipe into the lower end ofwhich is fitted a bottom bearing of cast iron. Into the upperend is fitted a cast steel post cap to which the end of the tensionrod is secured. The jib member is a 7 in., 15-Ib. I-beam securedto the post by a special cast steel connection which is rivetedboth to the beam and the post. The pillar is suppor
. Railway mechanical engineer . OLWORK The pillar crane, the details of which are shown in the en-graving, was designed especially for serving machine tools. It is»ery simple in construction and is easily rotated in the base. Thepillar is a piece of 6 in. extra heavy pipe into the lower end ofwhich is fitted a bottom bearing of cast iron. Into the upperend is fitted a cast steel post cap to which the end of the tensionrod is secured. The jib member is a 7 in., 15-Ib. I-beam securedto the post by a special cast steel connection which is rivetedboth to the beam and the post. The pillar is supported in a cast iron base 3 ft. square and 3ft. 9 in. high bored slightly larger than the pillar. A bottombearing block is bolted to the base, in the upper face of which isa babbit-lined hemispherical recess. In this and a similar recessin the pillar bearing runs a tool steel ball lyi in. in top of the base is counterbored to receive a housing \0% in-in diameter, which contains a roller liearing running on the Cc75/ /ron of Self-Contained Pillai BoHom Bearing Block. Roller She I. the opposite end of the valve chamber, a train of gearing and an air motor. The gear train is assembled in a casing, an air motor is attached to the driving shaft and the hollow driven shaft is designed to slip over the nut on the threaded rod. The gear train is very powerful and enables one man to attend to the pulling in of the bushings. The pitch diameters of the gears and the number of teeth are as follows: Gear / 11^ in. pitch diam., 115 teeth Gear / 2 in. pitch diam., 18 teeth Gear K 8 in. pitch diam., 80 teeth Spindle XA in. pitch diam., 13 teeth Xo tests have been made, either prior to or after the inaugura-tion of the practice of maintaining piston valves herein de-scribed, to determine its effect upon leakage. There is, there-fore, no specific data as to the amount of reduction effected,but general observations have shown that it is
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
