Hydraulic jet drills

Claim 2

Apparatus for drilling a hole by means of a hydraulic jet comprising: a frame; intensifier means rotatably mounted on said frame and having high- and low-pressure sides; a shank piece having a bore therethrough operatively connected to said intensifier and adapted to have a hollow drill rod connected thereto; means for rotating said intensifier means and said shank piece; first conduit means for conducting fluid under pressure to the low-pressure side of said intensifier; second conduit means for conducting fluid to the high-pressure side of said intensifier; and third conduit means for flow connecting the high-pressure side of said intensifier and the bore in said shank piece so that fLuid under pressure will be conducted from the high-pressure side of said intensifier to the working face of a hole being drilled.

Claim 3

The apparatus of claim 1 further comprising a first reservoir and said second conduit is connected to said reservoir and check valve means positioned in said second conduit for preventing fluid from flowing from the high-pressure side of said intensifier to said first reservoir.

Claim 4

The apparatus for claim 2 further comprising check valve means for positioned in said third conduit means for permitting fluid to flow from the high-pressure side of said intensifier only when the fluid on the high-pressure side exceeds a predetermined pressure.

Claim 5

The apparatus of claim 1 further comprising swivel means for operatively connecting said first and second conduit means to said intensifier means.

Claim 6

The apparatus of claim 4 wherein said intensifier is double acting.

Claim 7

The apparatus of claim 5 further comprising a mounting; said frame being mounted on said mounting; and means for advancing said frame relative to said mounting as the hole being drilled increases in depth.

Claim 8

Apparatus for drilling a hole by means of a hydraulic jet comprising: a frame; a casing defining first and second interconnected cylinders rotatably mounted on said frame; said first cylinder having a diameter larger than said second cylinder; first and second rigidly interconnected pistons mounted for reciprocal movement in said first and second cylinders; a shank piece having a bore therethrough operatively connected to said casing; first conduit means for conducting fluid to said first cylinder for reciprocating said first and second pistons; second conduit means for conducting fluid to said second cylinder; third conduit means flow connecting said second cylinder and the bore in said shank piece; and a check valve positioned in said third conduit means for preventing fluid from flowing from the bore in said shank piece to said second cylinder and for permitting flow of fluid from said second cylinder to said bore only when the fluid in said second cylinder exceeds a predetermined pressure.

Claim 9

Apparatus for drilling a hole by means of a hydraulic jet comprising: a frame; a casing defining first and second interconnected cylinders rotatably mounted on said frame; said first cylinder having a diameter larger than said second cylinder; first and second rigidly interconnected pistons mounted for reciprocal movement in said first and second cylinders; a shank piece having a bore therethrough operatively connected to said casing; first conduit means for conducting fluid to said first cylinder for reciprocating said first and second pistons; second conduit means for conducting fluid to said second cylinder; third conduit means flow connecting said second cylinder and the bore in said shank piece; and a check valve positioned in said third conduit means for preventing fluid from flowing from the bore in said shank piece to said second cylinder and for permitting flow of fluid from said second cylinder to said bore only when the fluid in said second cylinder exceeds a predetermined pressure.

Claim 10

The apparatus of claim 7 further comprising means for rotating said casing and swivel means operatively connecting said first and second conduits to said casing.

Claim 11

The apparatus of claim 8 further comprising a mounting; said frame being slidably mounted on said mounting; and means for moving said frame relative to said mounting.

Claim 12

The apparatus of claim 9 wherein there are a pair of second cylinders and a pair of second pistons, each of said second cylinders being connected to said their conduit means.