Modular screw anchor having lead point non-integral with helix plate
US4334392A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1980 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Apr 3, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D2200/1671
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A high strength, modular screw anchor is disclosed which exhibits enhanced failure resistance notwithstanding use of essentially the same amount of material as conventional anchors, and which can be installed using existing installation equipment. The preferred screw anchors of the invention include an elongated rod having one or more separate, specialized anchor members supported thereon, and an improved, obliquely oriented, beveled earth-penetrating lead to facilitate installation, particularly in rocky soils. The anchor member includes a tubular, central, rod-receiving hub presenting a polygonal in cross-section bore therethrough, and an outwardly extending helical blade affixed to and coaxial with the hub. In installation procedures the anchor rod is passed through the hub bore and the anchor member is operably coupled to the rod (as by resting it atop an outwardly extending shoulder provided on the rod); the tubular shank of a standard anchor wrench is next telescoped over the anchor rod and inserted into the hub bore such that a driving connection is established between the rod, shank and anchor member. Axial rotation of the wrench thus effects corresponding rotation of the s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.