E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
85/2, 61/47
E21D 21/00 (2006.01) E21D 20/02 (2006.01)
Patent
CA 1135086
MINE ROOF BOLTING Abstract of the Disclosure Mine roof bolting using an anchoring fastener com- prising a bolt having a head at one end and screw-threaded at said one end, and a nut threaded on the bolt engageable with the head. On turning the nut in one direction, it moves along the bolt away from the head. On turning the nut in the other direction, it moves toward the head until it engages the head, at which point further rotation of the nut in said other direc- tion turns the bolt in that direction. In the use of the fas- tener, a hole is drilled up in the mine roof, a supply of a two-component resin in the unmixed, unhardened condition is in- serted in the bore, a portion of the fastener is inserted in the bore so that the headed end and the nut are outside the bore, the nut is rotated in said other direction so that it en- gages the head and is rotated further so that the bolt is ro- tated in the bore to mix the two components of the resin, the resin is allowed to harden and the nut is rotated in said one direction to move the nut into pressing relation with the mine roof.
346840
Peabody Coal Company
Smart & Biggar
LandOfFree
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