. A practical treatise on natural and artificial concrete; its varieties and constructive adaptations . equently complained of, such as thehigh cost of renewal of jaws, and the difficulty of dealingwith materials in a wet or slippery condition. Fig. 12 shows the simple, single-action Goodmanscrusher, which differs from the Blake by being direct inaction, without the intervention of the middle or motion-transferring jaw. The crushing movement is derived fromthe eccentric of the driving shaft impinging on the fixedjaw, as in the Blake. The adjustment for different sizes iseffected through the ag
. A practical treatise on natural and artificial concrete; its varieties and constructive adaptations . equently complained of, such as thehigh cost of renewal of jaws, and the difficulty of dealingwith materials in a wet or slippery condition. Fig. 12 shows the simple, single-action Goodmanscrusher, which differs from the Blake by being direct inaction, without the intervention of the middle or motion-transferring jaw. The crushing movement is derived fromthe eccentric of the driving shaft impinging on the fixedjaw, as in the Blake. The adjustment for different sizes iseffected through the agency of wedges regulated by attachedscrews. The speed at which this machine requires to bedriven is much greater than that of the Blake, and objectionis raised by some to the large amount of friction which thisinvolves, but the writer has not in his experience found anyinsuperable difficulty from this cause. The simple character MACHINERY FOR REDUCING THE AaGREGATES. 133 of the * Goodmans crusher, its comparatively low cost, andextreme portability, render it a most useful aggregatereducer. Fig. Goodmans Single-action Stone Crusher, Fig. 13 is an illustration of a double-acting Goodmanscrusher, into the scheme of which is introduced a togglearrangement, differing, however, from the Blake, because itis not intended to regulate the size of the produce from themachine, but to facilitate the action of the movable ormiddle jaw; the desired size of reduced material being, asin No. 12 machine, controlled by the regulating wedgesattached to the fixed jaws. The patent specification describesthis somewhat novel machine as follows:— 134 A PRACTICAL TREATISE ON CONCRETE. The extent of the motion of different parts of the block(movable jaw) is controlled by the fulcrum levers, each ofwhich abuts on one of its sides in a cavity prepared for it inthe upper end of the block, and on the other side each leverabuts in recesses formed in the two side-cheeks of the fulcrum levers al
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1879
