Engineering and Contracting . t. line, the rail-way company had to do a considerable amount of excava-tion for which it employed the electrically driven Thewautomatic shovel illustrated herewith. This shovel is of the horizontal crowding motion typeand has several other features of interest. It weighs , has a dipper with a capacity of % cu. yd. and aclearance height over the house of 12 ft. 2 in. It ismounted on regular car wheels on which it travels on thecar tracks and in addition is equipped with a set of aux-iliary traction wheels, 33 in. in diameter, and 15-in. tread,which permits
Engineering and Contracting . t. line, the rail-way company had to do a considerable amount of excava-tion for which it employed the electrically driven Thewautomatic shovel illustrated herewith. This shovel is of the horizontal crowding motion typeand has several other features of interest. It weighs , has a dipper with a capacity of % cu. yd. and aclearance height over the house of 12 ft. 2 in. It ismounted on regular car wheels on which it travels on thecar tracks and in addition is equipped with a set of aux-iliary traction wheels, 33 in. in diameter, and 15-in. tread,which permits it to run under its own power over theground, pavement, or wherever it is desired to take it. The horizontal dipper crowding motion utilized is saidto be particularly adapted to the application of electricdrive because of the ease of control and povver material with a shovel it is necessary firstto crowd the dipper forward into the material, then tohoist it upward through the material. In this case, the. Thew Shovel Excavating for Street Railway Track. first motion is made horizontally, being obtained as fol-lows: The dipper is suspended by an adjustable arm, hingedto a carriage or trolley moving horizontally along a suit-able trackway. This enables the shifting of the pointof rotation for dipper, so that the hoisting force is at alltimes exerted in the most effective manner, while thecrowding force is applied horizontally. The combina-tion of the horizontal trackway and the boom channelsresults in a structure braced and reinforced to withstandthe severe strains which the boom is called upon to en-dure. The trolley motion is controlled by a lever. Thislever is further connected to a trip rod which is operatedautomatically when the trolley reaches the limit of itsmotion in either direction. The crowding motion enablesthis type of shovel to be advantageously employed forvery shallow excavating operations. The entire motive power for traction, hoisting andsw
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
