The Strauss Bascule Bridge Company, Inc., engineers and designers of trunnion, bascule and direct lift bridges. . addi setting thor brakes ; ated emergency brake isprovided. Emer-gency hand-opera-tion is also pro-vided, consistingprimarily of a handcrank geared to themachinery at the ay When closed the bridge i> locked to the rest pier bymean-- of a motor-driven latch bar moving inguides attached to the front end of the bridge andengaging a suitable casting anchored to the pier,the lock motor and gear train being mounted on theend of tin- leal beneath the flex the < irs hot lid i short d
The Strauss Bascule Bridge Company, Inc., engineers and designers of trunnion, bascule and direct lift bridges. . addi setting thor brakes ; ated emergency brake isprovided. Emer-gency hand-opera-tion is also pro-vided, consistingprimarily of a handcrank geared to themachinery at the ay When closed the bridge i> locked to the rest pier bymean-- of a motor-driven latch bar moving inguides attached to the front end of the bridge andengaging a suitable casting anchored to the pier,the lock motor and gear train being mounted on theend of tin- leal beneath the flex the < irs hot lid i short distance backof the trunnion, is employed to effect 3 illustrates the conditions that main-tain the leaf in equilibrium—(g) is the center ofgravitv of the moving leaf, whose moment is(Px), about the main trunnion (A), in which (P)is the weight of moving leaf considered concen-trated at point (g). Point (g1) is the center of The Strauss Bascule Bridge Company. The, Strauss Bascule Bridge Company gravity of the counterweight whose moment is(Wy), about (A), in which (W) is the weight ofcounterweight considered concentrated at (g).and applied vertically at (B). The moment(Wy) is made equal and opposite to the moment(Px), which condition balances all vertical forcesabout (A), and the structure is thus in equilibriumfor the closed position of the bridge. For anyother position of the bridge, such as indicated indotted lines, it can be seen that the forces are alsoin equilibrium by virtue of the fact that thethree points, (g), (A), (B), lie in a straight line,thus establishing a constant relation between thehorizontal lever arms, about (A), of leaf andcounterweight, and furthermore because the coun-terweight is pivotally attached to the leaf andmoves parallel to its initial position as explainedabove. From the foregoing it will be seen that themain trunnions support the weight of leaf andcounterweight, and that this weight, termed the deadload, th
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Keywords: ., bookcentury1900, bookdecade1920, bookidthestraussba, bookyear1920
