Combined rigid profile and stretching roof bolt with expansion element
US5018919A · kind A · utility
39Cited by
8References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1990 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Mar 12, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0026
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In rock or roof bolts, in particular combined rigid profile and stretch or strain roof bolts, the bolt bar, except for the bar tip is surrounding by a sheathing tube and the end thereof projecting out of the drillhole mouth is made tensionable with respect to the rock by means of an anchor plate and a screw means. To ensure the immediate loadbearing capability of such a roof or rock bolt, in particular in the filling mortar method, at least one portion (5) of the sheathing tube (3) is provided as expansion element with cutouts (7) distributed into slots (8) and the bolt tip (2) is formed as abutment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.