초록 ▼

A resilient annular transition collar is provided for roadway structures, including manholes and catch basins, which acts as a flexible transition between the rigid structure or frame of the manhole and the semi-rigid structure of the asphalt paving. The resilient transition collar absorbs any movem

A resilient annular transition collar is provided for roadway structures, including manholes and catch basins, which acts as a flexible transition between the rigid structure or frame of the manhole and the semi-rigid structure of the asphalt paving. The resilient transition collar absorbs any movement of the pavement during expansion and contraction and this absorption avoids the prior art problems of break-up, cracking and separation between manhole and pavement. Risers or adjusting rings may be employed in conjunction with the transition collar to ensure a flush fit between the pavement surface and the upper surface of the transition collar. A mold structure for forming the collars includes heat transfer studs to provide an increased production rate.

대표청구항 ▼

A resiliently-flexible riser ring for use in a roadway construction comprising a self-supporting rigid frame structure and a resilient transition collar structure, said riser ring being formed from scrap rubber from automobile tires, said riser ring being one element of a set of resiliently-flexible

A resiliently-flexible riser ring for use in a roadway construction comprising a self-supporting rigid frame structure and a resilient transition collar structure, said riser ring being formed from scrap rubber from automobile tires, said riser ring being one element of a set of resiliently-flexible riser rings comprising first and second risers of different uniform thickness to effect height adjustment of said transition collar structure in said roadway construction and a third riser of wedge shape in elevation, varying uniformity from a minimum dimension at one side thereof to a maximum dimension at the other side thereof to effect orientation adjustment of said transition collar.