Tool driving or impacting – Advance causing or controlling means
Patent
1996-04-29
1998-07-14
Smith, Scott A.
Tool driving or impacting
Advance causing or controlling means
173 4, 173147, 173154, E02F 518, E21B 720
Patent
active
057789886
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a drilling apparatus which has an advancing unit comprising a drilling pipe rotating and pushing unit the height of which latter unit is adjustable in relation to guide tracks of the base frame in accordance with the diameter of the drilling pipe. Such adjustment permits the lower surface of the drilling pipe to be positioned at the same height in relation to the guide tracks of the base frame irrespective of the pipe diameter.
Previously known drilling apparatus which drill in a horizontal direction have a support for rotating and pushing a drilling pipe into soil at the front end of the guide tracks of which there are provided height adjustable supports for different pipe diameters, and the rotating and pushing units supports the drilling pipe such that the pipe center is always located at the same height above the guide tracks in spite of different pipe diameters.
When several side by side holes are drilled with this previously known construction, the support at the front end of the guide tracks has to be adjusted to different heights when changing the pipe diameter in order to align the drilling pipe with the guide tracks. Also in the rotating and pushing unit, the rotating center has to be positioned according to the largest pipe diameter. This causes maximum strain against the base construction because the lever arm of the pushing force is always of the same maximal length when using all sizes of the pipe diameter. This causes bending strain on the base guide tracks and hard strain on the bearing surface between the advancing unit and guide tracks.
These disadvantages can be avoided according to the invention.
The most important advantage for the invention is that there is in the advancing unit a supporting construction for the various sizes of drilling pipes which can be easily mounted at an appropriate level corresponding to a particular pipe diameter. The lower surface can always be positioned at the same height above the guide tracks. Accordingly, it is not necessary to adjust the position of the guide tracks even though the pipe diameter size changes. Also the lever arm which strains the advancing unit and the base frame when a drilling pipe is pushed is always the shortest possible.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention is described more closely referring the enclosed drawing where:
FIG. 1 is a diagrammatic perspective view of drilling apparatus in accordance with the invention;
FIG. 2 is a diagrammatic top view of the drilling apparatus of FIG. 1;
FIG. 3 is a diagrammatic side elevation view of the drilling apparatus of FIG. 2.
DESCRIPTION OF PREFERRED EMBODIMENTS
In FIG. 1 there are guide tracks 4 mounted on an adjustable frame 50 on which tracks an advancing unit 51 is moved during drilling. Cylinders 5 are provided for adjusting the height of crosswise beam 52 in the frame. The advancing unit 51 comprises a housing 10 which is partly like a box, having a bottom and side walls. Supports 9 are fixed to the inner surfaces of the side walls of the housing 10 at different heights. A rotating and pushing unit 53 is mounted on supports 9 by sideways-directed lever plates 11 inserted between supports 9 with a clearance which allowing gliding. The rotation and pushing unit 53 has a hydraulic motor 12 as a rotating device which motor rotates by means of a herringbone gear a pipe coupling 7 which is located in the center of a pushing part 8. In use, a drilling pipe 1 comprising conveyor spiral 2 and center pipe 3 is fixed to pipe coupling 7 as shown in FIG. 2. Pressurized air is lead via center pipe 3 to a drill bit (not shown) in the drill head (not shown). The pipe 1 is pushed by means of pushing part 8 when the whole advancing unit is moved in the drilling direction (shown by arrow "X") on the guide tracks 4. A hydraulic motor 13 and a chain 6 is used for moving the advancing unit.
In general, only certain pipe sizes are used in drilling. The height level of the supports 9 is selected according to the size of a
REFERENCES:
patent: 2143105 (1939-01-01), Curtis
patent: 2665117 (1954-01-01), Ivey
patent: 3612195 (1971-10-01), Rich
patent: 3682261 (1972-08-01), Bird
patent: 4161990 (1979-07-01), Forsberg et al.
patent: 5050688 (1991-09-01), Patterson
patent: 5355965 (1994-10-01), Rozendaal
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