Plastic fillable manhole cover with penetrating handles
US5123776A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1991 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Jan 31, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A manhole cover comprises a top having a top surface and an edge portion, a depending portion having a sidewall and a bottom surface, and an interior chamber. The manhole cover is fabricated from a first material, while the interior chamber is at least partially filled with a second material. The manhole cover preferably includes recessed handles which are recessed into the top and extend downwardly through the bottom surface. Cooperative engagement means in the form of inter-fitting indentations and protuberances are provided in the top surface and the bottom surface respectively. The bottom surface includes a first surface portion which includes a peripheral edge portion and a bracing portion. The bracing portion includes a plurality of brace members each of which have a lower brace surface and a brace sidewall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.