Lift insert assembly and fabrication assembly method therefore
US5884438A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1997 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | Feb 27, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C1/666
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A lift pin insert assembly is releasably mounted upon a mold member for casting a manhole section. The mold is filled with concrete, which surrounds and embeds the insert assembly in the cast member. The insert is configured to receive a lift pin, which is automatically moved to a locked position when a lifting force is applied. The insert assembly includes a reinforcing support assembly having at least a face plate and a metal rod of suitable thickness engaging the insert, and anchored either to the face plate or an additional support plate. The support assembly distributes the forces applied by the lifting force to the cast member substantially uniformly over a large surface area, significantly increasing the weight load capable of being lifted by a given lift pin without increasing the size and/or diameter of the lift pin and blocks the lift pin from sliding out of the insert when the cast member is lifted by the lift pin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.