Manhole cover stop mechanism
US7891904B2 · kind B2 · utility
23Cited by
9References
15Claims
0Family size
Inventor
Key dates
| Filing date | Jun 11, 2009 |
| Grant date | Feb 22, 2011 |
| Priority date | — |
| Expiry date | Oct 13, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/1436
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A stop mechanism advantageously combined with a manhole cover includes a holder body having a passage which slidably receives a stop member able to be cammed in and out upon advance or retraction of a threaded drive member having an enlarged tip engaged with a down sloping channel formed in the stop member. Upper sides of the channel engage the tip upon reversal of the drive member to cam the stop member back into the holder body. The stop member when extends prevents removal of the cover from being blown completely free of the manhole vault structure in the event of an explosion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.