The Strauss Bascule Bridge Company, Inc., engineers and designers of trunnion, bascule and direct lift bridges. . upporting structural steelcolumns in line with the main trusses, and pivot-ally connected thereto by trunnions, termedcounterweight trunnions, secured to the trusses,and journal-bearings secured to the column counterweight is held in an upright positionby means of a rigid member termed the counter- about which the bascule span leaf, rotates ink, one end being pivoted to the topcounterweight and the other to a fixedr gallows frame, built up from the outsidei posts. The cen
The Strauss Bascule Bridge Company, Inc., engineers and designers of trunnion, bascule and direct lift bridges. . upporting structural steelcolumns in line with the main trusses, and pivot-ally connected thereto by trunnions, termedcounterweight trunnions, secured to the trusses,and journal-bearings secured to the column counterweight is held in an upright positionby means of a rigid member termed the counter- about which the bascule span leaf, rotates ink, one end being pivoted to the topcounterweight and the other to a fixedr gallows frame, built up from the outsidei posts. The center line of the counter-weight link is parallel and equal in length to a linejoining the main and counterweight trunnions,these two points and the two link pivots forming aparallelogram by virtue of which the counterweightis constrained to move parallel with its initialposition and so establishes one of the conditionsthat maintains the leaf in equilibrium while thebridge operates. Further details concerning con-ditions for equilibrium are demonstrated in thefollowing pages. The Strauss Bascule Bridge Company. Tke Strauss Bascule Bridge Company Tlu- span is opened and closed by two circularcurved rack and pinion drives, the prime moverbeing electric motors. The curved racks are se-cured, one to each of the bottom chords of the and are engaged by shafts mounted insymmetrical jour-rings trically interlocked with the nso that neither can be operasequence.
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Keywords: ., bookcentury1900, bookdecade1920, bookidthestraussba, bookyear1920
