Quantcast

Drilling machine having a feed cable tensioner

Imported: 24 Feb '17 | Published: 06 Jan '04

Donald W. Smith

USPTO - Utility Patents

Abstract

The drilling machine includes a frame that is supported for movement over the ground and a tower that is mounted on the frame. A rotary head is movable along the tower and engageable with a drill string for rotating the drill string. A pull down cable is connected to the rotary head for pulling the rotary head downward for pushing the drill string into the ground. A pull back cable is connected to the rotary head for pulling the rotary head upward for pulling the drill string out of the ground. The pull back cable is subject to a slack condition in response to elastic stretch of the pull down cable. A slack take-up device is connected to the pull back cable to remove the slack created in the pull back cable by the elastic stretch of the pull down cable.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view illustrating a drilling machine embodying the present invention.

FIG. 2 is an enlarged perspective view illustrating the rotary head guides of the drilling machine shown in FIG.

1.

FIG. 3 is a an enlarged view illustrating the rotary head guide shown in FIG. 2 partially disassembled.

FIG. 4 is a cross section view taken along line

4

4 in FIG.

3.

FIG. 5 is a perspective view illustrating a feed cable system of the drilling machine shown in FIG. 1 with the rotary head in the raised position.

FIG. 6 is a perspective view illustrating the feed cable system shown in FIG. 5 with the rotary head in the lowered position.

FIG. 7 is an enlarged perspective view illustrating an upper portion of the feed cable system shown in FIG.

6.

FIG. 8 is an enlarged perspective view illustrating a lower portion of the feed cable system shown in FIG.

6.

FIGS. 9-13 are schematic views illustrating a slack take-up device of the feed cable system shown in FIG.

5.

FIG. 14 is an enlarged top perspective view illustrating a non-impact breakout system of the drilling machine shown in FIG.

1.

FIG. 15 is a plan view illustrating the operation of the non-impact breakout system shown in FIG.

14.

FIG. 16 is a cross section view taken along line

16

16 in FIG.

15.

FIGS. 17-21 are enlarged perspective views illustrating the non-impact breakout system shown in FIG.

14.

Claims

1. A drilling machine for use with a drill string, the drilling machine comprising

2. A drilling machine as set forth in claim 1 wherein the frame is supported by crawlers.

3. A drilling machine as set forth in claim 1 wherein the tower is movable relative to the frame between a substantially vertical position and a non-vertical position.

4. A drilling machine as set forth in claim 1 and further comprising an operator station on the frame.

5. A drilling machine as set forth in claim 1 wherein the pull down and pull back cables have respective first ends connected to the tower and respective second ends connected to the rotary head, and wherein the pull down and pull back cables are reeved around respective pulleys movable relative to the tower to cause movement of the rotary head.

6. A drilling machine as set forth in claim 5 wherein the pulleys are mounted on a pulley support member, and further comprising a linear motor for moving the pulley support member relative to the tower to cause movement of the rotary head.

7. A drilling machine as set forth in claim 6 wherein movement of the pulley support member in one direction creates tension in the pull down cable to pull the rotary head downward, and wherein movement of the pulley support member in the opposite direction creates tension in the pull back cable to pull the rotary head upward.

8. A drilling machine as set forth in claim 6 wherein the linear motor is a cylinder/piston assembly.

9. A drilling machine as set forth in claim 5 wherein the slack take-up device is connected between the tower and the first end of the pull back cable.

10. A drilling machine as set forth in claim 5, wherein the slack take-up device is a cylinder/piston assembly.

11. A drilling machine as set forth in claim 10, wherein the cylinder/piston assembly is supplied with constant pressure to remove the slack in the pull back cable by providing the pull back cable with constant tension.

12. A drilling machine as set forth in claim 11 wherein the pull down cable has a stretched condition when a first pulling force is applied to the pull down cable and an unstretched condition when the first pulling force is removed from the pull down cable, and wherein the constant tension provided by the cylinder/piston assembly allows the pull down cable to return to the unstretched condition from the stretched condition.

13. A drilling machine as set forth in claim 12, wherein the cylinder/piston assembly extends to an equilibrium position when the first pulling force is removed from the pull down cable and locks in the equilibrium position when a second pulling force is applied to the pull back cables.

14. A drilling machine as set forth in claim 12 further comprising a take up device connected between the tower and the first end of the pull down cable, wherein the pull back cable has a stretched condition when a second pulling force is applied to the pull back cable and an unstretched condition when the second pulling force is removed from the pull back cable, the take up device adapted to remove the slack caused by permanent stretch of the pull down and pull back cables when the pull down and pull back cables are in the unstretched condition.

15. A drilling machine as set forth in claim 14 wherein the take up device is one of a hydraulic and an electric jackscrew.

16. A drilling machine as set forth in claim 1 wherein the slack take up device automatically returns the slack to the pull back cable when the pull down cable returns to an unstretched condition.

17. A drilling machine for use with a drill string, the drilling machine comprising

18. A drilling machine for use with a drill string, the drilling machine comprising