Abstract: A cover for a utility trench includes upper and lower surfaces enclosing a hollow cavity, which is subdivided by multiple, transverse channels recessed into an extending transversely across the lower surface. The channels form fused engagements or “kiss offs” with the upper surface, which increase the transverse rigidity of the cover for enhanced load-bearing capacity spanning across the opening formed by the trench. The hollow construction of the cover, which can comprise a suitable plastic, tends to minimize its weight A pair of flanges extend along respective sides of the cover and are bolted to the trench sidewall top edges in overlying relation. A pair of shoulders are formed inside the flanges and are adapted to extend into the trench with the cover positioned thereover. A method of manufacturing a utility trench cover includes rotary molding a hollow cover with kiss offs.

Abstract: A cover for a utility trench includes upper and lower surfaces enclosing a hollow cavity, which is subdivided by multiple, transverse channels recessed into an extending transversely across the lower surface. The channels form fused engagements or “kiss offs” with the upper surface, which increase the transverse rigidity of the cover for enhanced load-bearing capacity spanning across the opening formed by the trench. The hollow construction of the cover, which can comprise a suitable plastic, tends to minimize its weight A pair of flanges extend along respective sides of the cover and are bolted to the trench sidewall top edges in overlying relation. A pair of shoulders are formed inside the flanges and are adapted to extend into the trench with the cover positioned thereover. A method of manufacturing a utility trench cover includes rotary molding a hollow cover with kiss offs.

Abstract: A marker post comprising an embodiment or aspect of the invention includes a body with upper and lower ends, a bore extending between the ends and a sidewall enclosing the bore. A top panel is mounted on the body upper end and encloses the bore thereat. A base is mounted on the body lower end and includes a perimeter positioned outwardly from the sidewall. An embodiment or aspect of the mold assembly for rotary molding the marker post includes first and second mold halves enclosing a mold cavity with body and base subcavities. In one embodiment or aspect of a marker post manufacturing method of the invention, the body and base are integrally rotary molded in first and second mold halves, which are separated for extracting the rotary-formed marker post.