Multiple building block lifting device
US6481769B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Oct 19, 2001 |
| Grant date | Nov 19, 2002 |
| Priority date | — |
| Expiry date | Oct 19, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C1/32
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A lifting device that simultaneously lifts a plurality of retaining wall blocks initially oriented in a triangular configuration on a pallet and allows them to be easily realigned in a linear configuration on a retaining wall. The lifting device comprises two pivoting lateral extending side arms with clamping units attached to their distal ends. Attached to the main planar frame is a central clamping unit. Each clamping unit includes an insert member that inserts into a large, vertically aligned hole formed in the block. When the clamping units are inserted into the hole and activated, three triangularly aligned sets of blocks on a pallet may be lifted. The side arms are designed to pivot rearward so that the front surfaces of the blocks are longitudinally aligned and the blocks are positioned in a side-by-side manner. Once properly realigned, the lifting device is lowered so that the three blocks are simultaneously placed over the top row of the retaining wall. The gripping members are then relaxed so that the blocks are released. The side arms then automatically align in their original positions so that they may be used to connect to another set of triangularly aligned blocks on …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.