Abstract:
A drilling tool (10) incorporating first and second ends, a shaft (13, 90) extending between the ends. The first end has a drill bit (15) to penetrate rock. The drill hit and the shaft have complementary threads. The drill bit and the shaft comprise a relative rotation stop means (82, 83) that ensures that the drill bit remains loose during drilling in a first direction. The invention further relates to a self drilling rock bolt (10), a drill bit (15), drill shaft (13,90) and shaft coupling (94), an anchoring device (23), and an end coupling (95) per se.
Abstract:
A tool kit including a clamping structure formed of dual clamping bodies that define a cylindrical projecting member when the clamping bodies are united, a force transfer adapter, a substantially cylindrical force applying member having a tapered end and an elongated yoke having a longitudinal bore defined therein, wherein the first end of the yoke and the cylindrical projecting member have cooperating features for facilitating a non-permanent engagement with one another when the dual clamping bodies are united, and wherein the second end of the yoke and the force applying member include cooperating features for facilitating the gradual application of force to the force transfer adapter.
Abstract:
A rock bolt comprising a shaft having first and second ends, and an anchoring device operative to retain the bolt when located in a drilled hole and comprising a mandrel mounted to, or integrally formed with, the shaft and at least one expansion element overlaying the mandrel, at least one of the mandrel or the at least one expansion element being a movable member and being able to rotate relative to, and move axially along, the shaft, the at least one expansion element being arranged to be displaced radially outwardly on a predetermined relative movement between the mandrel and the at least one expansion element, wherein when disposed on a first portion of the shaft, rotation of the movable member relative to the shaft causes axial movement of that member along the shaft, and when disposed on a second portion of the shaft, the movable member is able to rotate on the shaft without being biased to move axially along the shaft.
Abstract:
A rock bolt comprising a shaft having first and second ends, and an anchoring device operative to retain the bolt when located in a drilled hole and comprising a mandrel mounted to, or integrally formed with, the shaft and at least one expansion element overlaying the mandrel, at least one of the mandrel or the at least one expansion element being a movable member and being able to rotate relative to, and move axially along, the shaft, the at least one expansion element being arranged to be displaced radially outwardly on a predetermined relative movement between the mandrel and the at least one expansion element, wherein when disposed on a first portion of the shaft, rotation of the movable member relative to the shaft causes axial movement of that member along the shaft, and when disposed on a second portion of the shaft, the movable member is able to rotate on the shaft without being biased to move axially along the shaft.
Abstract:
A cutting pick comprising an elongate shank and a cutting tip which is mounted to one end of the shank to project from that end. At least two sleeve segments are provided and those segments are circumferentially fixed about the shank to form a substantially annular sleeve. The sleeve can be fixed about the shank in non-contacting relationship with the trailing end of the cutting tip. Moreover, the cutting tip can have a portion of maximum diameter which is of greater diameter than the inner diameter of the sleeve so that the portion of maximum diameter overlies the sleeve radially.
Abstract:
A tool kit including a clamping structure formed of dual clamping bodies that define a cylindrical projecting member when the clamping bodies are united, a force transfer adapter, a substantially cylindrical force applying member having a tapered end and an elongated yoke having a longitudinal bore defined therein, wherein the first end of the yoke and the cylindrical projecting member have cooperating features for facilitating a non-permanent engagement with one another when the dual clamping bodies are united, and wherein the second end of the yoke and the force applying member include cooperating features for facilitating the gradual application of force to the force transfer adapter.
Abstract:
The present invention relates to a rock bolt comprising first and second ends, a shaft extending between the ends, and an anchoring device extending along a first part of the shaft adjacent the first end. The anchoring device comprises a mandrel, and at least one expansion element overlaying the mandrel. The expansion element is displaced radially outwardly on a predetermined relative movement between the mandrel and the expansion element. The expansion element is joined to a connector to form an anchor assembly. The anchor assembly is keyed to the mandrel. The anchor assembly comprises relative rotation actuator means active during rotation of the anchoring device. The invention further relates to an anchoring device per se.
Abstract:
A drilling tool incorporating first and second ends, a shaft extending between the ends. The first end has a drill bit to penetrate rock. The drill bit and the shaft have complementary threads. The drill bit and the shaft comprise a relative rotation stop means that ensures that the drill bit remains loose during drilling in a first direction. The invention further relates to a self drilling rock bolt, a drill bit, drill shaft and shaft coupling, an anchoring device, and an end coupling per se.