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US 6,385,913 B1Granted
Steel manhole
OwnerByung Moo Ahninventor
Life of this patent
Estimating the term…
Abstract
A steel manhole is provided which includes a steel box having a hole having a bolt hole and formed at an upper portion of the same, a height control pipe having a vertical longitudinal hole inserted into an inner diameter portion of the hole, a multi-hole lid for covering an upper portion of the height control pipe, a male screw formed at left and right portions of the steel box and having a male screw portion, and a female screw having a thread portion for being threaded with the male screw pipe.
Claims7
A steel manhole, comprising:
- a steel box having an integral hollow casing formed at an upper portion of the steel box;
- a height control pipe secured in said casing in a height adjusted position therein;
- a multi-hole lid covering an upper portion of the height control pipe;
- male pipes having external male threads projecting at left and right portions of the steel box;
- and
- connection pipes having female threads threaded on said male threads.
3 more elements
A steel manhole, comprising:
- a wave form steel pipe;
- a hollow casing projecting upwardly at an intermediate upper surface portion of the wave form steel pipe and having a plurality of holes at a side surface thereof;
- a height control pipe inserted into said casing and having a plurality of height control holes at positions corresponding to the holes in the casing,
- a multi-hole lid inserted into an upper portion of the casing to cover the upper portion of the casing, and
- a gathering chamber formed at a lower portion of the wave form steel pipe opposite the casing on the upper surface of the wave form steel pipe.
2 more elements
Dependencies are inferred from the claim text.