Coupling for lift system for concrete slabs
US4204711A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1978 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Jul 20, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C1/666
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A flared tube sitting on a base is embedded in a concrete slab, and a casement on a shackle can be inserted into the tube to make up the coupling. The casement holds a plunger which can be locked into a position in which its head urges balls out of the casement for engagement with the flare tube. The plunger lock includes a fork locking the casement to the plunger at the other end. The plunger head has a conical tip so that upon retraction the balls can be retracted to release the coupling or to insert the casement to make up the coupling. The flared tube is clamped down onto the base which in turn is constructed for fastening to re-bar structure in the concrete.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.