. American engineer and railroad journal . Fig. \. material clogging the doors or from freezing. These requisitesall appear to be provided for in this door, with the furtherrecommendation that the parts are not liable to damage whendoors are left open on the road. Instead of being hinged to the hopper these doors are swungfrom it by straps, shown in the engravings, the pivots beingthe hopper irons, and the effect of its construction is to bindthe doors and the hopper together, insuring tightness whenclosed. The doors are not different from those used withhinged connections to the hopper direct
. American engineer and railroad journal . Fig. \. material clogging the doors or from freezing. These requisitesall appear to be provided for in this door, with the furtherrecommendation that the parts are not liable to damage whendoors are left open on the road. Instead of being hinged to the hopper these doors are swungfrom it by straps, shown in the engravings, the pivots beingthe hopper irons, and the effect of its construction is to bindthe doors and the hopper together, insuring tightness whenclosed. The doors are not different from those used withhinged connections to the hopper direct. The two doors are connected by a pair of toggle levers ofdifferent lengths. The shorter of these two arms is fastenedto its door by a bracket. The longer arm is bent into a shaft. Fig. 2. running across the bottom of its door to the other side and isbent around again to form the longer arm on the other sideof the hopper. The arrangement of each side being the sameit is possible to open or close the doors from either side. Theoperation is shown in the three views given. Pig. 1 shows thedoors in the open position. In order to close them the operatorgrasps the hand-hold and lifts it to the position shown In From that point he pushes the toggles in front of him,folding the two levers upon one another and laying them downupon a bracket placed upon the outer edge of left hand side ofthe hopper. In folding the toggles he has rotated the levers until the line of the longer lever has passed the dead center ofthe pivot of the shorter lever. When the load comes upon thedoors there is then a compression strain on the shorter leverand a tensile strain on the longer, the two forces counteractingone another and preventing any movement of the doors. Thenatural tendency
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
