Inflow dish

Abstract

A two piece inflow dish assembly for installation in an enlarged manhole opening to prevent debris from entering the manhole to clog the sewer system and to permit the inflow dish assembly to be removed from the manhole in separate pieces.

Claims

1. A manhole system comprising: a manhole being formed with a cylindrical wall, a ledge extending interiorly from said cylindrical wall, said ledge having a slot extending radially along said ledge so as to form a ring and a manhole cover removably mounted to said ledge; an inflow dish assembly for mounting in said manhole, said inflow dish assembly comprising; an outside dish and an insert dish mounted within said outside dish, said outside dish having a circumferential flange, said circumferential flange removably disposed on said ring so as to be bound by said ledge and disposed within said manhole and below said cover, said outside dish having an offset central opening forming a second ledge surrounding said opening, said second ledge disposed on a plane beneath the circumferential flange and parallel to the circumferential flange, and said inside dish removably mounted within said opening and on said second ledge.

2. The manhole system as set forth in claim 1, wherein said circumferential flange having a planar surface and an outer edge, the planar surface resting upon said ring, the outer edge disposed within the slot.

3. The manhole system set forth in claim 1, wherein said insert dish is dimensioned to fit within a standard size manhole opening.

4. The manhole system as set forth in claim 3, wherein said outside dish is dimensioned to fit within an enlarged size manhole opening.

5. The manhole system as set forth in claim 1, wherein said insert dish and said outside dish are formed of polycarbonate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Reference will be made herein to various drawings, wherein like reference numerals refer to like parts throughout and wherein:

[0009] FIG. 1 is a fragmentary cross sectional view of the upper part of a manhole with a two-piece inflow dish assembly of the present invention shown in place;

[0010] FIG. 1a is an enlarged view of a portion of the structure shown in FIG. 1;

[0011] FIG. 2 is top perspective view of the outside dish of the present invention; and

[0012] FIG. 3 is top perspective view of the two piece dish assembly of the present invention.

DETAILED DESCRIPTION

[0013] Referring now to the drawings an inflow dish assembly 10 of the present invention is shown which includes an outside dish 14 having a central opening 13 which receives an insert dish 12 to provide the two-piece inflow dish assembly 10. The inflow dish assembly 10, as can best be seen in FIG. 1, is dimensioned to fit within a manhole opening 16 of a manhole 17 and below a manhole cover 18. The manhole opening 16 is of a diameter which is larger than the diameter of a standard manhole opening and the cover 18 is therefore larger than the standard manhole cover to fit within and close the manhole opening 16. Inflow dishes are commonly provided to be mounted below the manhole cover 18 in the manhole opening 16 to collect rainwater and debris passing the cover 18 and before the rainwater can make its way into the sanitary sewer system and thereby causing the system to overflow.

[0014] The inflow dish assembly 10 of the present invention is of a diameter to fit within an enlarged manhole opening 18 of a manhole 19 and with the insert dish assembly 10 in place within the central opening 13 it is operable to fully block the manhole opening 16 below the manhole cover 18. With the inflow dish assembly 10 in place as shown in FIG. 1, debris and rainwater that has made its way past the manhole cover 18 can, in many instances, be removed by removing the cover 18 and then removing only the insert dish 12.

[0015] The insert dish 12 is preferably dimensioned to fit within a standard manhole where it can be used without the outside dish 14.

[0016] As can best be seen in FIGS. 1 and FIG. 3 the insert dish 12 removably nests within the center of the outside dish 14 to close the central opening 13 (FIG. 2) formed within outside dish 14 to form the inflow dish assembly 10. As seen in FIG. 1 the inflow dish assembly 10 is intended to be inserted in the manhole opening 16 with an outwardly extending flange 22 of the outside dish 14 supported by a flange 20 formed in the wall 17 of the manhole 19. A slot 21 is preferably formed in the flange 20 to receive the flange 22 of the outside dish 14.

[0017] Still referring to FIGS. 1, 2 and 3 the outside dish 14 is provided with an offset internal flange 23 formed about the central opening 13 which supports an outer rim 24 (FIG. 3) of the insert dish 12 to receive a central portion 25 of the insert dish 12 within the central opening 13 to nest the insert dish 12 within the outside dish 14 to close the central opening 13.

[0018] It should be apparent that then an inflow dish assembly has been provided which includes an insert dish mounted within an outside dish to form an assembly which fits within a manhole that has been enlarged from the conventional size.

[0019] If access to the enlarged manhole is required any debris and rainwater can be removed by removing the inflow dish assembly in sections. If access through the enlarged manhole is not required it may only be necessary to remove the insert dish to gain access.

[0020] Inflow dishes have heretofore been commonly constructed of polyethylene or a similar plastic material. Applicant has found that polycarbonate and similar plastic material as well as acrylic possess the strength necessary to prevent the dish from sagging and thereby risking debris and rainwater and even the dish itself from falling into the manhole and into the sanitary system.

[0021] Having thus described the disclosed two-piece inflow dish assembly of the present invention, other embodiments for the present invention that do not depart from the scope of the claims will become apparent to those of skill in the art.