EP 0029354 A1 19810527 - Anchoring of roof bolts.
Title (en)
Anchoring of roof bolts.
Title (de)
Verankern von Firstkappen.
Title (fr)
Mise en place de boulons d'ancrage de toit.
Publication
Application
Priority
- ZA 796237 A 19791119
- ZA 796523 A 19791130
Abstract (en)
This invention relates to the anchoring of roof bolts in drill holes by the roaming of enlarged sections (3) within a preformod drill hole (2) so that a shoulder (4) of rock is formed at the junction of the drilled and reamed sections of the hole. The expansion head of a roof bolt is expanded within the hole so that the segments (42) of the expansion shell engage and positively lock against the shoulder (4). In this way an improved lock for a roof bolt in a drill hole is obtained and the roof bolt resists dislodgement under load.
IPC 1-7
IPC 8 full level
E21D 20/00 (2006.01); E21D 21/00 (2006.01)
CPC (source: EP)
E21D 20/00 (2013.01); E21D 21/008 (2013.01)
Citation (search report)
- FR 1327260 A 19630517
- US 1338345 A 19200427 - WILSON ELIHU C, et al
- US 1347469 A 19200720 - STEVEN TOTH
- US 1362513 A 19201214 - SKINNER CHARLES P
- US 1372917 A 19210329 - FRED SWAN
- US 1578482 A 19260330 - FRED SWAN
- DE 2730026 A1 19780112 - MACDONALD PNEUMATICS [GB], et al
- CH 608565 A5 19790115 - BATTELLE MEMORIAL INSTITUTE [CH]
- BE 643734 A 19640529
- CH 579207 A5 19760831 - STUMPP & KURZ
- US 2771746 A 19561127 - AUGUST FISCHER, et al
- DE 7805430 U1 19780720
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 80304087 A 19801114; AU 6420980 A 19801107