Manhole lift insert locator
US6109587A · kind A · utility
7Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1997 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Sep 26, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04B1/4114
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A manhole lift insert positioning apparatus consisting of: (1) a threaded nut imbedded in a thermoplastic elastomer molding that fits snugly within a lift insert, and (2) a threaded wing bolt to engage the nut and expand the molding within the insert, thereby locking it in position and drawing the molding against the inside face of the concrete form, thus sealing the insert opening to avoid obstruction of that opening with concrete.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.