Abstract: A drill bit (10) for drilling geophysical exploratory holes using a non-rotating drill approach is disclosed. The bit (10) includes a tubular body (12) threaded at one end for engagement with a pipe stem. The elements (16a -b) of a divided conical tip (14) are hinged to a second end (20) of the bit body (12). The wall thickness of the bit body (12) gradually increases from the first end (18) to the second end (20) to create, when the divided elements (16a-b) of the tip are closed, a generally diamond-shaped cross section facilitating burrowing when forced into the soil. An O-ring (36) installed in a groove (34) about the outer circumference of the tip (14) biases divided elements (16a-b) closed until a selected tool is loaded through the interior of the bit body (12), whereupon the divided elements (16a-b) are forced to rotate radially outward. The bit (10) can then be raised and removed from the borehole as desired.

Abstract: A vibrator yoke assembly (Y) for drill stems is moveably mounted on a drilling rig (R). A guide rail (10) is mounted to a support section (22) of the drill rig (R). Traveling along the guide rail (10) along the direction of travel for the drill string while boring the hole is a carriage (28) supporting the yoke assembly (Y). Activation of a motor moves the carriage (28) along the guide rail (10) as desired by the operator. Affixed to the carriage (28) above the upper end (12u) of the upper section (12) of the drill string (14) is the yoke assembly (Y). The yoke assembly (Y) has an upper hydraulic motor (40) coupled to an upper end (42) of a quill body (44). The quill body extends through the yoke assembly (Y) and a lower end (48) of the quill body engages the upper pipe end (12u). A pair of vibrators (52a and 52b) are attached to the yoke assembly (Y).

Abstract: A drill bit (10) for drilling geophysical exploratory holes using a non-rotating dill approach is disclosed. The bit (10) comprises a tubular body (12) threaded at one end for engagement with a pipe stem. The elements (16a-b) of a divided conical tip (14) are hinged to a second end (20) of the bit body (12). The wall thickness of the bit body (12) gradually increases from the first end (18) to the second end (20) to create, when the divided elements (16a-b) of the tip are closed, a generally diamond-shaped cross section facilitating burrowing when forced in to the soil. An O-ring (36) installed in a groove (34) about the outer circumference of the tip (14) biases divided elements (16a-b) closed until a selected tool is loaded through the interior of the bit body (12), whereupon the divided elements (16a-b) are forced to rotate radially outward. The bit (10) can then be raised and removed from the borehole as desired.