E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
E21D 21/00 (2006.01)
Patent
CA 2444192
A mine roof bolt assembly for use in a bolt hole includes a rebar or rod having an externally threaded end and a nut ar other suitable fastener which is provided with an at least partially threaded opening configured to threadedly engage the threaded end of the rebar. A bore formed through the nut is configured for alignment with a position spaced a marginal distance from an outermost proximal end of the rebar when the nut is threaded on to the rebar in a first or initial position. A shear pin is inserted so as to locate partially within the bore formed in the nut to physically prevent the nut from being threaded further onto the rebar past the first position up to the application of a predetermined minimum torque. A thrust disk or other member is provided in the nut opening between the proximal end of the rebar and the pin. The disk is axially slidable, whereby when the fastener is rotated relative to the rebar under a predetermined minimum torque, the disk is moved axially to engage and cause the pin to fracture or shear at the junction between the nut and the disk periphery. The fractured pin fragment within the nut thus may be moved axially from the opening together with the disk, so as not to interfere or otherwise wedge between the bolt and nut threads as the nut is threaded onto the bolt.
Mansour Mining Inc.
Riches Mckenzie & Herbert Llp
LandOfFree
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