초록 ▼

A quick opening manhole cover including a clamping flange (16) which captures the ears (48) of a locking ring (46) upon rotation of the locking ring with respect to a manhole cover (40). The manhole cover has an O.D. less than the I.D. of the manhole for axial movement into the manhole. A gasket (42

A quick opening manhole cover including a clamping flange (16) which captures the ears (48) of a locking ring (46) upon rotation of the locking ring with respect to a manhole cover (40). The manhole cover has an O.D. less than the I.D. of the manhole for axial movement into the manhole. A gasket (42) about the manhole cover is clamped between the locking ring (46), manhole cover (40) and against the manhole surface upon axial movement of the manhole cover towards the locking ring.

대표청구항 ▼

A quick opening manhole cover assembly for closing the manhole of a pressure vessel or the like comprising: (a) a collar on said vessel about the manhole opening thereof, said collar having at least two spaced vertical slots and horizontal grooves in the inner periphery thereof, each slot communicat

A quick opening manhole cover assembly for closing the manhole of a pressure vessel or the like comprising: (a) a collar on said vessel about the manhole opening thereof, said collar having at least two spaced vertical slots and horizontal grooves in the inner periphery thereof, each slot communicating with one of said horizontal grooves; (b) a manhole cover having an O.D. smaller than the I.D. of the manhole opening; (c) a locking ring carried by and supported on said manhole cover, said locking ring being rotatably movable between defined limits with respect to said collar and manhole cover; (d) at least two spaced ears extending radially from said locking ring, said ears adapted for reception first into said vertical slots and thereafter into a locked position in said horizontal grooves upon rotation of said locking ring with respect to said collar and manhole cover; (e) first means extending from said collar and connected to said manhole cover for moving said manhole cover and locking ring as a unit axially into and out of the manhole opening and for carrying said ears axially into and out of said vertical slots; (f) second means carried by said manhole cover and connected to said locking ring for moving said manhole cover axially within the manhole opening with respect to said locking ring when said ears are in said locked position; (g) an annular seal member about the periphery of said manhole cover; and (h) an annular lip extending axially from said locking ring and about said manhole cover, said annular lip providing a seal seat for said annular seal member upon axial movement of said manhole cover towards said locking ring.