Manhole cover frames
US5769564A · kind A · utility
9Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 8, 1996 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | May 8, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A spacer arrangement is provided for use in raising the height of a manhole cover frame, including one or more base spacer elements and one or more upper side extension elements; said one or more base spacer elements are adapted to be located within said manhole cover frame with said one or more side extension elements extending upwardly relative thereto; the spacer arrangement is adapted to receive a manhole cover; at least an underside surface of said one or more base spacer elements includes downwardly directed projections for stabilizing at least said one or more base spacer elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.