Patents Assigned to Park Rubber Company
  • Patent number: 4368845
    Abstract: A railroad crossing structure for providing an improved devil strip. In particular, the invention proposes to bridge the span between adjacent sets of tracks with bridge members of steel or other like material of sufficient strength and rigidity. These bridge members preferably correspond in number to the ties supporting the rails in the area of the crossing, and are secured to them in any suitable fashion. The bridge members may be leveled to provide a flat horizontal surface by notching the ties to receive the ends of the bridge members. The space between the ends of the bridge members and the rails are filled with shims. Thereafter, an elastomeric surface is provided atop the bridge members, using elastomeric pads preferably of the type disclosed in the above-mentioned U.S. Pat. No. 4,093,120. Elastomeric pads of the type disclosed in this patent are preferred since the pads can be easily affixed atop the bridge members because no spikes are required.
    Type: Grant
    Filed: March 2, 1981
    Date of Patent: January 18, 1983
    Assignee: Park Rubber Company
    Inventors: John A. Perry, Frank M. Perry, Gerald P. Konczyk
  • Patent number: 4093120
    Abstract: A railroad crossing structure comprising one or more elastomeric pads which preferably have a flexible plate of a concave cross-section imbedded within them. The elastomeric pads are abutted together side-by-side and/or end-to-end to form the crossing, and the abutting edges thereof are formed with interlocking means to provide moisture-proof seams between them. The elastomeric pads are secured in place by means of rods extended longitudinally through them, with the ends of the rods being secured to anchor means.
    Type: Grant
    Filed: January 24, 1977
    Date of Patent: June 6, 1978
    Assignee: Park Rubber Company
    Inventor: David L. Canfield