EP 0031641 B1 19830518 - REMOVABLE COVERS AND FRAMES THEREFOR
Title (en)
REMOVABLE COVERS AND FRAMES THEREFOR
Publication
Application
Priority
GB 7944480 A 19791228
Abstract (en)
[origin: EP0031641A2] A manhole cover unit 1 comprises a cover 2 which is seated in a frame 3 to cover over a pit opening 7 the mouth of which is bounded by the frame. To protect the cover 2 against the effect of effluent gases escaping from the pit opening 7 when the unit 1 is used in a sewerage system, a barrier plate 4 is seated on a base flange 10 of the frame 3 so as to extend across the mouth of the pit opening below the cover. The barrier plate 4 is of a material which is resistant to corrosion such as a glass fibre reinforced synthetic plastics. To ensure that effluent gases do not escape past the barrier plate 4, a gasket 5 is bonded around its margin to seal against the base flange 10 on a ledge 12 thereof formed by a rebate 11. The gasket 5 is urged into sealing engagement with the ledge 12 by the weight of the cover 2 when resting on the base flange 10. The cover may have a solid top braced by a honeycomb ribbed structure on its underside. The cover 2 and frame 3 may be of cast iron.
IPC 1-7
IPC 8 full level
E02D 29/14 (2006.01); E02D 29/12 (2006.01)
CPC (source: EP KR)
E02D 29/14 (2013.01 - EP KR); E02D 29/1454 (2013.01 - EP); E02D 29/1463 (2013.01 - EP); E02D 29/149 (2013.01 - EP)
Designated contracting state (EPC)
DE NL
DOCDB simple family (publication)
EP 0031641 A2 19810708; EP 0031641 A3 19810909; EP 0031641 B1 19830518; AU 528746 B2 19830512; AU 6450380 A 19810702; BE 886723 A 19810416; DE 3063373 D1 19830707; FR 2472632 A1 19810703; GB 2066335 A 19810708; GB 2066335 B 19830602; IT 8026970 A0 19801224; KR 830004504 A 19830713
DOCDB simple family (application)
EP 80304044 A 19801112; AU 6450380 A 19801119; BE 2058906 A 19801218; DE 3063373 T 19801112; FR 8027344 A 19801223; GB 7944480 A 19791228; IT 2697080 A 19801224; KR 800004847 A 19801219