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Portable bridge system

  • US 5,603,134 A
  • Filed: 06/27/1995
  • Issued: 02/18/1997
  • Est. Priority Date: 06/27/1995
  • Status: Expired due to Term
First Claim
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1. In a portable bridge system formed from at least a pair of substantially rectangular bridge platforms, each of said bridge platforms defining substantially parallel sides and substantially parallel ends, said bridge platforms positioned in side-by-side relationship and connected to each other to form a bridge span, each of said bridge platforms comprising a plurality of laminates sandwiched between two side channel members and having an end plate channel members at each of said ends, said side channel members substantially perpendicular to each said end plate channel member, and wherein said laminates form a substantially planar top surface of each of said bridge platforms, wherein the improvement comprises:

  • each of said bridge platforms including at least a pair of substantially flat locking plates, each of said locking plates having opposed parallel plate faces with an opening extending through the plate faces, wherein one of said pair of locking plates is affixed to a first corner of said bridge platform and another of said pair of locking plates is affixed to a second corner of said bridge platform along the same side of the bridge platform, wherein said opposed parallel plate faces are substantially parallel to said bridge platform sides;

    at least one of said pair of bridge platforms including a plurality of shear plates each of which are integral with one of said two side channel members and spaced apart along the length of said side channel member, each said shear plate having an outer perimeter substantially complementary to a profile of said side channel member and having a shear plate engagement surface for engaging a surface of a side channel member;

    coupling means for coupling said pair of bridge platforms together in side-by-side relationship with the locking plates of one bridge platform substantially in alignment with the locking plates of the other of said pair of bridge platforms, including a bolt sized for insertion through the openings of said locking plates and means for securing the bolt to the locking plates, and wherein the outer perimeter of each said shear plate of one bridge platform is received within the side channel member of the adjacent bridge platform so that the shear plate engagement surface engages a surface of said side channel member.

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