Back to results
US 4,772,154 AGranted
Sealing gasket for a roadway manhole
AssigneePont-A-Mousson S.A.
InventorDidier Caroulle
Life of this patent
Estimating the term…
Abstract
A sealing gasket for an unlocked roadway manhole accessing a municipal sewage system is interposed between a cover 2 and a frame 1, and has an inverted L or hook-shaped cross-section including two spaced and parallel outwardly extending upper lips 18, 19 and two lower, oppositely extending lips 17, 20.
Claims7
An unlocked roadway manhole assembly, comprising:
- (a) a frame (1) defining a generally horizontally oriented, continuous closed figure having a generally vertical axis (X--X) and a radially inwardly extending frame collar (6),
- (b) a cover (2) configured to be seated within the frame, and
- (c) a continuous, closed figure sealing gasket (3) interposed between the frame and the cover, disposed in a generally horizontal plane when interposed therebetween, and comprising:
- (1) a vertical branch (15) extending around the vertical axis of the frame,
- (2) a generally horizontal branch (16) extending radially outwardly from an upper end of the vertical branch and disposed between a bearing surface (13) of the cover and an upper surface (7) of the frame collar, and
- (3) a first pair of spaced frustoconical lips (18,19) having conicities converging towards a lower, base portion of the gasket and extending upwardly and radially outwardly from an upper surface of the horizontal branch.
3 more elements
Dependencies are inferred from the claim text.