Versatile threaded construction stake usable to anchor and/or support construction forms, including concrete slab foundation forming devices
US6367764B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Nov 3, 1998 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Nov 3, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D2220/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A stake suitable for use in construction is formed from an elongate threaded metal member, typically of length between 0.45 meter and 1.8 meter, having two ends. A first end region, tapered to a sharp point over typically 3 centimeters, is suitable to be plunged into earth. A middle region has threads that are both deeply cut, typically at a ratio of root diameter to outside diameter less than 0.80, and steeply inclined, typically at least 1 in 20. A second end region has a feature in the shape of a regular prism suitable to be engaged by a torquing tool for rotation of the entire stake. The second end region feature may be a prism of regular cross section, normally a hexagonal prism, of a diameter everywhere less than the minor diameter of the middle region's threads. The second end region feature is preferably (i) a continuation of the middle region's threads in combination with (ii) several, normally two, nuts of 9 mm nominal internal diameter threaded onto the feature and tightly jammed together. The stake is readily screwed into and extracted even from even hard earth by forcible rotation with power tools. The threaded stake readily mounts devices and fixtures, and is particul…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.