Abstract: A mine roof anchor assembly usable with a quick-setting resin cartridge inserted into a mine roof opening including an elongated bolt having a first end and a second end, the bolt being threaded for a portion of its length at the second end. A mechanical anchor is carried on the threaded portion of the bolt and extends along a longitudinal axis in a longitudinal direction. The anchor assembly further includes a resin mixer attached to the bolt extending below the mechanical anchor toward the first end. The resin mixer includes an open-ended hollow sleeve having flared ends integral with a tube-like section positioned therebetween. The sleeve also includes at least one outwardly extending integral fin extending in the longitudinal direction and having a maximum radial distance from the central longitudinal axis less than the mine roof opening radius. A frangible element may also be carried on the elongated bolt between the mechanical anchor and the resin mixer.

Abstract: A mine roof anchor assembly usable with a quick-setting resin cartridge inserted into a mine roof opening is disclosed and includes a partially threaded elongated bolt having a first end, a mechanical anchor, such as a bail-type or mechanical expansion type, at a threaded end, and a mixing element, such as a coil, having an upper end attached to the bolt and positioned external of and surrounding a length along the bolt. The bolt receives a frangible hollow plastic sleeve which is positioned about the threaded portion and extends below the mechanical anchor toward the bolt head. A stopping element attaches to the bolt below the mechanical anchor toward the first end, whereby the frangible sleeve is sandwiched between the stopping element and the mechanical anchor. A shaft can also be coupled to the first end extending the length of the anchor assembly.

Abstract: A mine roof anchor assembly usable with a quick-setting resin cartridge inserted into a mine roof opening includes a partially threaded elongated bolt having a head at one end, a bail-type mechanical anchor at the threaded end, and an elongated helical coil having an upper end attached to the bolt and positioned external of and surrounding a substantial length along the bolt. A bearing plate and a two-faced washer can be positioned on the bolt head. Both sides of the washer may be coated with a dry lubricant such as graphite suspended in a resin base.

Abstract: The anchor bolt assembly is of the type used in mine roofs and the like in which the anchor bolt assembly is positioned in a bore hole of a rock formation. The bolt assembly includes an elongated shaft having a frustoconical shaped plug at the upper end of the shaft and a head on the lower end of the shaft. A quick-setting resin cartridge is positioned in the bore hole above the plug of the bolt shaft and the bolt assembly is secured to the rock formation by at least the resin. The anchor assembly includes a helical coil external of, surrounding and connected to the bolt shaft for mixing the resin and urging it upward toward the plug end while the bolt shaft is rotated in one continuous direction. The helical coil is disposed below the conical plug and extends a substantial length along the bolt shaft to achieve the mixing.

Abstract: The anchor bolt assembly is of the type used in mine roofs and the like in which the anchor bolt assembly is positioned in a bore hole of a rock formation. The bolt assembly includes an elongated bolt shaft with a head on one end and is threaded on the other end and has a mechanical expansion anchor on the threaded end. A quick-setting resin cartridge is positioned in the bore hole above the threaded end of the bolt shaft and the bolt assembly is secured to the rock formation by both the expansion anchor and the resin. The anchor assembly includes a helical coil surrounding the bolt shaft for mixing the resin and urging it upwardly toward the threaded end while the bolt shaft is rotated in one continuous direction to secure the mechanical anchor to the rock formation. A method of anchoring such a bolt assembly is also disclosed.

Abstract: The anchor bolt assembly is of the type used in mine roofs where the anchor bolt is assembled and positioned in a drill hole in a rock formation and in which quick-setting adhesives secure the assembly to the rock formation. The assembly includes an elongated reinforcing rod, an elongated bolt, and a coupling internally threaded at each end and connected to the rod and bolt. A cylindrical plug of aluminum is positioned within the bore of the coupling and frictionally engaged by the threads so as to permit the entire assembly to turn in a first position and to disengage from its frictional engagement to permit turning of only the elongated bolt in a second position.