. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fig. 2.—Cushion tire. 1,000 miles, or only ^.^ gr. per ball, an actual surface wear of only j-^q,,^ in. The frame of a bicycle is gcnerallv constructed of weldless steel tube, and consistsessential jiarts. the frf)nt fork and the backbone. )f two In order to give extra strength to the fork, to enable it to resist the torsional strain pro- CYCLES. 169 duced by the riders pulling upon the steering-handles, i
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fig. 2.—Cushion tire. 1,000 miles, or only ^.^ gr. per ball, an actual surface wear of only j-^q,,^ in. The frame of a bicycle is gcnerallv constructed of weldless steel tube, and consistsessential jiarts. the frf)nt fork and the backbone. )f two In order to give extra strength to the fork, to enable it to resist the torsional strain pro- CYCLES. 169 duced by the riders pulling upon the steering-handles, it is generally drawn and tapered intoan oval section, wliile the backbone is of circular section, although somewhat tapered toward. Fig. 3.—Ball-hearing. the point where it is usually brazed to the backbone. This latter is bent and blocked intoshape from a blank of sheet-steel, the sides being usually of a half-round section. Frequently,however, the back fork is simply a prolongation of tlie backbone [troper. The front fork ismade rigid between the axle and front end of the backbone. liearing in mind tiiat the front wheel is the steering-wheel, and that this is carried in thevertical front fork, the method of mounting and controlling the wheel must be considered. At the top of the fork is a socket or head pivotally connected by a sliort spindle with thefront end of the backbone, coned bearings being [)rovi(ied at each end of the spindle. A trans-verse bar having handles at both ends, and fixed upon the head just mentioned, serves to con-trol the steering-wluei. and affords also asteadiment for the rider. A brake-liandie is pivotedto the handle-bar in such way as to be easily grasped by the rider without releasin
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
