Abstract: Apparatus for manipulating a tool which is particularly suited for use in drilling and inserting bolts into thin seams of mine workings. The apparatus (100) comprises a reaction support member (4) to support the tool, a chuck (1) for holding the tool, mounting member (12) in which the chuck (1) is mounted, and a lever linkage (13) connected between the mounting member (12) and the support member (4). The lever linkage (13) comprises parallel chuck orienting members (5, 10) connecting the mounting member to a control member (9), said control member being adapted to manipulate the chuck orienting members and to control the orientation of the chuck. The lever linkage further comprises first and second links (14, 15) each having first and second ends. The links are pivotally attached to each other at the first ends thereof. The first link is pivotally attached at the second end thereof to the mounting member and the second link is pivotally attached at the second end thereof to the support member.

Abstract: The arrangement is especially intended for mining equipment for driving a winning machine 20 along a face conveyor 11, on which the machine rides. The conveyor sections carry corresponding rack sections 30 having formations 40 each comprising two laterally spaced teeth 40a,40b, defining a channel 41 therebetween. The pinion has a disc-shaped body 43 having apertures 45 loosely mounting bands 44 of the type provided in a round-link chain. The bands engage with the teeth and the loose-mounting allows slight vertical and horizontal articulation of the bands. This reduces wear, especially at the joints between rack sections.

Abstract: A track-mounted vehicle having legs which can be retracted or extended, so that the vehicle can be raised to permit advancement of the track and then lowered, the vehicle either being raisable off the track to permit advancement, or having captivating means by which the track is raised, together with the vehicle, the track and the vehicle having rack-and-pinion or rack-and-chain drive means so that, in the raised position, the track can be advanced by said drive means and, in the lowered position, the vehicle is movable along the track by said drive means.