Apparatus for forming an opening with a gasket in a masonry manhole

An assembly for installing a resilient gasket having a projecting, pipe-engaging portion and an anchoring portion fixed in the peripheral wall of a circular opening in a masonry wall, said masonry wall having an inner face and an outer face, said assembly consisting of:

• (a) an inner mold disc consisting of a main, dish-shaped central circular area provided with a central aperture and defined by an annular rim, said rim being provided with a radially-inwardly extending portion, and an annular rim portion, said annular rim portion directly abutting a flat face of said resilient gasket;
• (b) an outer mold disc consisting of a main central dish-shaped circular area provided with a central aperture, said main dish-shaped central circular area of said outer mold disc coinciding with the main dish-shaped circular area of said inner mold disc, said circular area of said outer mold disc being defined by an annular rim directly abutting the annular rim of said inner mold disc;
• and
• (c) a rectangular fixing bar including a plurality of longitudinally spaced-apart holes therein, and bolts passed through aligned selected apertures in said rectangular fixing bar, in said inner mold disc and in said outer mold disc, thereby forming said assembly where said inner mold disc is temporarily secured to said outer mold disc with said elastomeric gasket locked therebetween, and means at the upper end of said rectangular fixing bar for suspending said assembly from said masonry wall.