Post tensionable grouted anchor assembly
US4295761A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1979 |
| Grant date | Oct 20, 1981 |
| Priority date | — |
| Expiry date | Dec 10, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B37/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A resin or grout anchored rock or mine roof nut and anchor assembly including an elongated cylindrical anchor to be inserted in a bore hole in assembled relation with a nut after insertion of a destructible adhesive resin or grout containing cartridge. The anchor includes an elongated threaded rod to be received in threaded portions of the nut and the nut includes a frangible disc normally held by crimped lip portions forming a stop wall to stop rotation of the nut relative to the anchor when the nut and anchor are assembled at a first relative axial position and operative when the anchor is restrained against rotation in the bore hole by setting of the adhesive resin and torque above a selected threshold is applied to the nut to dilate the crimping and expel the disc to accommodate further threaded insertion of the nut onto the anchor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.