Molded pleated gasket and device for installing same on pipe
AssigneeA-Lok Corporation
InventorJohn Ditcher
Life of this patent
Estimating the term…
Abstract
A gasket for resiliently supporting a sewer pipe in a manhole opening, while sealing the opening against fluid flow, which gasket is a molded annulus of elastomeric material having a peripheral flange of substantial width and thickness connected by a radially extending web to an inner concentric rib of greater width than said web, and adapted to be embedded in concrete to its radially inward face, said rib having an integral circular skirt extending inwardly therefrom in a non-radial direction, and united at its rim with a second circular skirt oriented thereto at a reverse angle, said second skirt merging throughout its periphery into an O-ring of slightly smaller diameter than the diameter of the sewer pipe it is adapted to surround.
Claims9
A molded elastomeric gasket for resiliently supporting a sewer pipe in a manhole opening and sealing the space between the wall of the opening and the surface of the pipe, said gasket having an outer cylindrical flange member extending axially on both sides of a mid-plane which is normal to the axis of the pipe;
- a first web of substantial thickness extending radially inwardly from a mid-region of the inner surface of said cylindrical flange member and integral therewith, said web and said flange being adapted for embedment in settable material lining the manhole opening;
- an intermediate web, integral with said first web and extending at an obtuse angle radially inwardly from the mid-plane and at its inner edge being united with a third web, which extends from the juncture line at a reverse angle towards the pipe, said third web terminating in a rim portion of toroidal form, integral with said web and having an inner diameter substantially less than the outer diameter of said pipe.
A molded elastomeric gasket of circular shape having an inner toroidal portion adapted to closely embrace a pipe, said portion being of substantially smaller inner diameter than the outer diameter of said pipe, and said gasket having an outer peripheral flange, T-shaped in section, adapted to be fixedly anchored in settable material lining an opening in a manhole wall, with the base of the T lying radially inward of its head portion, said toroidal portion merging tangentially with an integral inner skirt portion and said outer flange merging, at the base of the T, with an outer skirt portion, the inner edge of the outer skirt being integrally joined to the outer edge of the inner skirt, the whole being characterized in that the combined width of said skirt portions is greater than the distance between the toroidal portion and the base of the T-shaped flange.
Dependencies are inferred from the claim text.