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A platform for research: civil engineering, architecture and urbanism
Plastic moulded man hole cover and method
A method of manufacture of a cover 10, such as a manhole cover, comprising a cover plate 12 and a series of strengthening formations 24 integrally formed with the cover plate, comprising supplying a plastics material to a mould cavity shaped to define a cover plate section and a strengthening formation section, where an injection inlet is spaced from the strengthening formation section. The cover plate section may increase in thickness with distance from the inlet; or it may have uniform thickness. Preferably the plastics material is a fibre reinforced material. Preferably, the strengthening section may comprise a series of walls defining a hexagonal honeycomb structure. A slip or skid resistant surface may be integrally moulded on the cover plate. The inlet position helps prevent weld lines causing weakness in the cover. A cover is further provided.
Plastic moulded man hole cover and method
A method of manufacture of a cover 10, such as a manhole cover, comprising a cover plate 12 and a series of strengthening formations 24 integrally formed with the cover plate, comprising supplying a plastics material to a mould cavity shaped to define a cover plate section and a strengthening formation section, where an injection inlet is spaced from the strengthening formation section. The cover plate section may increase in thickness with distance from the inlet; or it may have uniform thickness. Preferably the plastics material is a fibre reinforced material. Preferably, the strengthening section may comprise a series of walls defining a hexagonal honeycomb structure. A slip or skid resistant surface may be integrally moulded on the cover plate. The inlet position helps prevent weld lines causing weakness in the cover. A cover is further provided.
Plastic moulded man hole cover and method
RONALD FRANCIS CLARK (author)
2021-12-08
Patent
Electronic Resource
English
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