Manhole cover and sound arresting vibration-proof structure of cover frame

摘要

(57) Abstract Objective Generation and the man hoe of the noise with vehicle passing and the likeThe fact that the ru cover breaks off from the cover frame is prevented almost completely. Constitution The manhole cover and the man who possess the inclined condition outer part surfaceIt possesses the inclined condition inside surface which is matched on the inclined condition outer part surface of the hole coverThe ru cover frame the empty are constituted in those which, the manhole cover the coverThe underside and the cover frame which contact the framework contact the manhole coverAmong the surfaces, in each case at least on 1 aspects 1 where concave facilities it doesInterposing in the mounting hole and this mounting hole, to be locked, at the same time takingAt least the cushioning 1 canning the aperture marginal part of the attaching holeSudden facilities it did on the inclined condition outer part surface of the pad and the manhole cover, it is littleAlso the ku corresponds to 1 rotary prevention lug pieces and this rotary prevention lug pieceDoing, on the inclined condition inside surface of the cover frame concave facilities the rotary prevention earhole which is done toolPreparation it does.