Method of providing a gasket seal between sewer pipe and manhole opening

Claim 1

The method of using an extruded tubular gasket having the cross-sectional configuration of a capital A to form a seal between the inner surface of an opening in a masonry wall and the outer surface of a pipe adapted to pass through said opening, which method comprises the steps of positioning a gasket of said cross-sectional configuration in a recess formed between the mating edges of a pair of oppositely tapered mold forms, said recess being configured to receive and hold only that portion of said gasket which corresponds to the apex of the A, but to leave the webs which correspond to the legs of the A projecting outwardly from said mold; bolting the mold forms together, to consolidate them with said gasket; mounting the mold forms in the opening in said masonry wall; infilling the space between the mold form and the inner surfaces of said opening with settable material, so as to fill that space and embed the outwardly projecting webs corresponding to the legs of the capital A in said settable material; and removing the mold parts after the settable material has set, so as to leave that portion of the gasket which was not embedded in the settable material projecting into the space intended to receive the pipe.

Claim 2

The method of using an extruded tubular gasket having the cross-sectional configuration of a capital A to form a seal between the inner surface of an opening in a masonry wall and the outer surface of a pipe adapted to pass through said opening, which method comprises the steps of positioning a gasket of said cross-sectional configuration in a recess formed between the mating edges of a pair of oppositely tapered mold forms, said recess being configured to receive and hold only that portion of said gasket which corresponds to the apex of the A, but to leave the webs which correspond to the legs of the A projecting outwardly from said mold; bolting the mold forms together, to consolidate them with said gasket; mounting the mold forms in the opening in said masonry wall; infilling the space between the mold form and the inner surfaces of said opening with settable material, so as to fill that space and embed the outwardly projecting webs corresponding to the legs of the capital A in said settable material; and removing the mold parts after the settable material has set, so as to leave that portion of the gasket which was not embedded in the settable material projecting into the space intended to receive the pipe.

Claim 4

The method of constituting a resilient seal between an opening in a masonry wall and a pipe which passes through said opening, which method includes the use of extruded tubing of elastomeric material having a shape in cross section analogous to that of a capital A and which method includes the steps of positioning and clamping a length of such tubing which is less than the outer circumference of such pipe between the rims of a pair of interconnectible mold parts which are configured to receive and retain the apex-shaped portion of said tubing but to allow the divergent webs which constitute the legs of the A to project outwardly beyond the circumference of said mold parts, said mold being mounted within the opening in the said wall; casting a mass of settable material between the inner surfaces of said opening and the outer surface provided by the peripheral contours of said mold parts, thus embedding the webs which project beyond the mold in said settable material; allowing the material to set; and separating and removing the mold parts so as to leave exposed the portion of said gasket which corresponds to the apex of the A, so that inserting such a pipe in the opening so provided will impose compressive stress on the exposed portion of said tubing.

Claim 5

The method of constituting a resilient seal between an opening in a masonry wall and a pipe which passes through said opening, which method includes the use of extruded tubing of elastomeric material having a shape in cross section analogous to that of a capital A and which method includes the steps of positioning and clamping a length of such tubing which is less than the outer circumference of such pipe between the rims of a pair of interconnectible mold parts which are configured to receive and retain the apex-shaped portion of said tubing but to allow the divergent webs which constitute the legs of the A to project outwardly beyond the circumference of said mold parts, said mold being mounted within the opening in the said wall; casting a mass of settable material between the inner surfaces of said opening and the outer surface provided by the peripheral contours of said mold parts, thus embedding the webs which project beyond the mold in said settable material; allowing the material to set; and separating and removing the mold parts so as to leave exposed the portion of said gasket which corresponds to the apex of the A, so that inserting such a pipe in the opening so provided will impose compressive stress on the exposed portion of said tubing.