Manhole
DC
First Claim
Patent Images
1. A manhole comprising:
- a metal top ring for containing a manhole cover,a metal manhole cover for being releasably contained in said top ring,a metal skirt made of flexible sheet steel material forming a partially closed chamber and having upper and lower portions forming major openings to said chamber,said top ring being welded to said upper portion,said skirt material and top ring being deformable when said lower portion is subjected to a lateral force greater than a predetermined lateral force,a member connected to said lower portion of said skirt for providing said skirt lateral strength and stiffness to prevent said skirt and top ring deformation resulting from said predetermined lateral force and for serving as a footing at the very bottom of the entire manhole, said member comprising a laterally extending flange,said lower portion comprising a skirt bottom and said flange being positioned at said skirt bottom, and wherein said flange is rolled integrally with and of the same material as said skirt as a single unitary sheet steel piece.
0 Assignments
Litigations
0 Petitions
Accused Products
Abstract
A manhole embodiment that includes a metal top ring, metal removable cover, and a flexible sheet steel skirt welded to the top ring. The skirt has a stiffening and footing flange rolled laterally inwardly or outwardly from the bottom rim of the skirt to increase the manhole lateral strength and provide a footing for the very bottom of the manhole.
6 Citations
3 Claims
-
1. A manhole comprising:
-
a metal top ring for containing a manhole cover, a metal manhole cover for being releasably contained in said top ring, a metal skirt made of flexible sheet steel material forming a partially closed chamber and having upper and lower portions forming major openings to said chamber, said top ring being welded to said upper portion, said skirt material and top ring being deformable when said lower portion is subjected to a lateral force greater than a predetermined lateral force, a member connected to said lower portion of said skirt for providing said skirt lateral strength and stiffness to prevent said skirt and top ring deformation resulting from said predetermined lateral force and for serving as a footing at the very bottom of the entire manhole, said member comprising a laterally extending flange, said lower portion comprising a skirt bottom and said flange being positioned at said skirt bottom, and wherein said flange is rolled integrally with and of the same material as said skirt as a single unitary sheet steel piece. - View Dependent Claims (2, 3)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
Litigation Data
-
Current AssigneeUniversal Valve Company Incorporated
-
Original AssigneeUniversal Valve Company Incorporated
-
InventorsMilo, Joseph V., Pettesch, Martin C.
-
Primary Examiner(s)LISEHORA, JAMES
-
Application NumberUS09/123,014Time in Patent Office281 DaysField of Search404/25, 404/26, 52/20, 52/19, 137/363, 137/364, 137/371, 220/86.1, 138/96 R, 285/405US Class Current404/25CPC Class CodesE02D 2200/14 resilient or elasticE02D 2300/0032 in sheet form, i.e. bent or...E02D 29/14 Covers for manholes or the ...E02D 29/1409 adjustable in height or inc...
