A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Here's metcalfe roof bolt
Description of recently patented roof bolt designed to obtain maximum anchorage with minimum of installation time gives promise of reducing roof bolt failures, due to improved anchorage; invention uses opposing cam surfaces to advance expander into segmented expansible piece or shell so it will grip borehole wall and provide anchorage; advantages of new design are stressed. (51556)
Here's metcalfe roof bolt
Description of recently patented roof bolt designed to obtain maximum anchorage with minimum of installation time gives promise of reducing roof bolt failures, due to improved anchorage; invention uses opposing cam surfaces to advance expander into segmented expansible piece or shell so it will grip borehole wall and provide anchorage; advantages of new design are stressed. (51556)
Here's metcalfe roof bolt
Coal Mining Process
1968
2 pages
Article (Journal)
English
© Metadata Copyright Elsevier B. V. All rights reserved.
| Engineering Index Backfile | 1953
Tema Archive | 1990
Special roof bolt applications
| Engineering Index Backfile | 1954
Pull tests as measure of roof bolt efficiency and of roof bolt design
| Engineering Index Backfile | 1963