Manhole closure assembly with support ring

Claim 2

The combination of a manhole closure assembly for preventing drainage and storm water from entering into a manhole opening, an annular manhole frame surrounding the upper portion of the manhole including means for supporting a lid in covering relationship over the manhole, and a separate support ring for the closure assembly adjacent the inside of the annular manhole frame including a closure supporting flange and means for placing the ring in compression against the inside of the annular manhole frame to thereby secure the ring to the frame, the closure assembly including a substantially circular cover plate the arcuate edge portions of which engage the closure supporting flange of the support ring, a first valve member secured to the cover plate constructed and arranged to relieve pressure inside the manhole when the pressure therein exceeds a predetermined amount, and a second valve member secured to the cover plate arranged to relieve vacuum inside the manhole when the vacuum therein exceeds a predetermined amount, and wherein the cover plate comprises a pair of semicircular segments, and a connector strip that seals and connects the semicircular segments together along their diametral edges.

Claim 3

The combination of a manhole closure assembly for preventing drainage and storm water from entering into a manhole opening, an annular manhole frame surrounding the upper portion of the manhole including means for supporting a lid in covering relationship over the manhole, and a separate support ring for the closure assembly adjacent the inside of the annular manhole frame including a closure supporting flange and means for placing the ring in compression against the inside of the annular manhole frame to thereby secure the ring to the frame, the closure assembly including a substantially circular cover plate the arcuate edge portions of which engage the closure supporting flange of the support ring, a first valve member secured to the cover plate constructed and arranged to relieve pressure inside the manhole when the pressure therein exceeds a predetermined amount, and a second valve member secured to the cover plate arranged to relieve vacuum inside the manhole when the vacuum therein exceeds a predetermined amount, and wherein the cover plate comprises a pair of semicircular segments and a connector strip that seals and connects the semicircular segments together along their diametral edges, the connector strip having an S-shaped cross section the openings of which are constructed and arranged to snugly receive the diametral edge portions of the semicircular segments of the cover plate.

Claim 4

The combination of a manhole closure assembly for preventing drainage and storm water from entering into a manhole opening, an annular manhole frame surrounding the upper portion of the manhole including means for supporting a lid in covering relationship over the manhole, and a separate support ring for the closure assembly adjacent the inside of the annular manhole frame including a closure supporting flange and means for placing the ring in compression against the inside of the annular manhole frame to thereby secure the ring to the frame, the closure assembly including a substantially circular cover plate the arcuate edge portions of which engage the closure supporting flange of the support ring, a first valve member secured to the cover plate constructed and arranged to relieve pressure inside the manhole when the pressure therein exceeds a predetermined amount, and a second valve member secured to the cover plate arranged to relieve vacuum inside the manhole when the vacuum therein exceeds a predetermined amount, and wherein the cover plate comprises a pair of semicircular segments and a connector strip that seals and connects the semicircular segments together along their diametral edges, the connector strip having an S-shaped cross section the openings of which are constructed and arranged to snugly receive the diametral edge portions of the semicircular segments of the cover plate.

Claim 5

The combination of claim 2 in which the first valve member is secured to one of the semicircular segments of the cover plate and the second valve member is secured to the other semicircular segment of the cover plate.