| 摘要 |
This invention relates to a chuck assembly (12) for a drill box (10) of a mine drill for releasably securing a mining tool (14) including a working end (16) and a depending rod-like member (18) for roof bolting and roof and face drilling operations and a method of using the chuck assembly. The drill box (10) includes a source of rotary power (20) and a drive member (22) operatively connected to the source of rotary power (20) to rotatably drive the chuck assembly (12). The chuck assembly (12) includes a spindle (28), a collet closer (32) and a collet (30). The spindle (28) is operatively connected to the drive member and has a sleeve (34) of a cylindrical shape including a threaded collar end (40) and a bottom end (37) and an opening (35) extending a selected distance from the collar end (40) to the bottom end (37). The collet closer (32) includes an annular housing (54) having an aperture (62) threaded for threadingly engaging the threaded collar end (40) of the spindle. The collet (30) includes a forward end portion (48) and an opposing tapered rear end portion (50) and an internal bore (56) capable of receiving the rod-like member (18) of the mining tool. The collet (30) extends a selected distance within the opening of the sleeve (34) such thae the collet (30) closes uniformly around the rod-like member (18) of the mining tool (14) as the collet (30) is compressed within the opening of the sleeve (34) by the action of the collet closer (32) threadingly engaging the threaded collar end (40).
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