Abstract: A portable earth boring machine for the horizontal boring of shafts and the insertion of pipeline casing sections in installations where excavation from the surface is undesirable. The machine is characterized by frame means adapted for movement along a track means, which frame means supports an engine which drives an earth boring auger as well as casing pusher apparatus for pushing casing sections into the earth fill as the boring operation progresses. The machine is further characterized by a fluid actuated pusher cylinder means for advancing the auger into the earth fill and associated automatic auger feed control means for automatically maintaining a constant fluid flow rate to said pushing cylinder means under variations in resistance to auger penetration of said earth fill during a boring operation.

Abstract: This invention relates to conduit training means and more particularly an elongated, tensioned training means for training conduits in a predetermined path.

Abstract: In a drill rig, a device for exchanging a drill bit is mounted on a feed bar and is arranged movably to and from the drill axis. The bit exchanging device comprises means for holding a bit being brought thereinto non-rotatively during rotation of the drill string. Furthermore, there are means for providing an anvil to the bit when delivering impacts against the drill string.

Abstract: A portable earth boring machine for the horizontal boring of shafts and the insertion of pipeline casing sections in installations where excavation from the surface is undesirable. The machine is characterized by a steering head particularly adapted for rock drilling operations which head is positioned at the front of the casings and remotely controlled by the machine operator so as to directionally control the direction of extension of the pipeline as the drilling operation progresses.