Sidewalk lifter
US4982930A · kind A · utility
Inventor
Key dates
| Filing date | Sep 16, 1988 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Sep 16, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S254/01
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A device for realignment of sidewalk sections displace by settling or tree root lifting, where a hazardous step exists at a joint or crack. A rigid beam is laid longitudinally on the sunken section, with cross beams reaching to the section sides. Hooks are suspended from the ends of the cross beams, and hooked under the edges of the slab. The hooks are shaped for stability, not requiring clamping on, or boring into, the slab. A jack lifts one end of the main beam, raising the hooks, and lifting one end of the slab, with evenly distributed force to avoid cracking the concrete. Fill-dirt is thrown under the raised section to restore vertical alignment. The device is operable by one person. It pivots the slab in a vertical plane, guiding accurate return to position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.