Adjustable earth boring device

Abstract

An adjustable earth boring device for provides a strong, easy to use, adjustable mount for cutters on earth boring devices. In a preferred embodiment, the device includes a grooved, wedge-shaped pocket and matching cutter segment with means to secure the cutter segment in the pocket. The wedge shaped pocket in the boring head is axially aligned with the boring device. Each side of the pocket has deep grooves somewhat resembling bolt threads. A slot in the rear of the pocket receives a bolt to secure the segment tightly in place. Threaded holes in the bottom of the pocket receive bolts through the cutter segment for a back up securing means. The cutter segment has a rolling cone cutter or series of blades or picks for cutting earth formations on the head end and a wedge shaped mounting body supporting it. The grooves are constructed such that the segments can be mounted at differing heights from the centerline of the boring head, thus determining the diameter which the boring device will cut. In another preferred embodiment, the pocket and the segment each define substantially parallel sides having locking, angled threads separated by installation grooves.

Dependencies are inferred from the claim text.