Patent ID: 7726903
Filing Date: 2010-06-01
Classification: E02D

Abstract:
1. A manhole system comprising: a manhole frame defining an manhole opening; a manhole cover mounted to said frame covering said manhole opening, said manhole cover having an outer circumferential edge; and a locking mechanism mounted to said frame and selectively movable between a locked position operatively engaging said outer circumferential edge of said cover and an unlocked position operatively disengaged from said outer circumferential edge of said cover, said locking mechanism securing said cover on said frame when in said locked position, said locking mechanism permitting removal of said cover from said frame when in said unlocked positions; said locking mechanism comprising: wherein said frame further includes locking mechanism seats for receiving said locking mechanism, said locking mechanism seats being recessed within said frame; and wherein said outer circumferential edge has recessed annular flanges for receiving said locking mechanisms.