MUNICIPAL CASTING FRAME AND METHOD OF MANUFACTURING SAME

摘要

A municipal casting frame with cast nut retainers that allow the frame to be used with or without a bolt-down cover. The frame defines at least one bolt hole to allow free passage of the cover bolts. The undersurface of the frame defines a cast nut retainer adapted to receive a nut. In one embodiment, the nut retainer includes protrusions that permit the nut to be soap-fitted into the nut retainer. In another embodiment, the nut retainer is configured to frictionally receive the nut in a wedging interaction. The present invention also provides a method for manufacturing a frame with integral cast nut retainers. The method includes the steps of providing a core corresponding in shape to the bolt hole and the cast nut retainer, casting a frame in a mold about the core, removing the cast frame from the mold and the core from the cast frame.