Drill bit with suction and method of dry drilling with liquid column

Claim 2

The improved method of drilling with a bit having a drilling fluid bore from the top connected to a source of drilling fluid under pressure and at least one cone journaled for rotation at the bottom comprising: (a) jetting all the drilling fluid upward from nozzles connected with said bore, (b) jetting all said drilling fluid from the nozzles through a discharge passage in the bit, said discharge passage (c) creating a low pressure in the passage, thereby (d) sucking up chips drilled by said cone through a space between the nozzle and passage and inside the passage, and (e) discharging the chips and fluid from the passage upward and outside the bit, (f) holding the column of fluid discharged by the discharge passage up by the jet of fluid from the passage, thereby (g) maintaining the area around the cone dry and free of of drilling fluid.

Claim 3

In a drill bit having (a) at least one cone having a maximum diameter journaled for rotation at the bottom, (b) a bore for drilling fluid at the top, and (c) means for connecting said bore to a source of drilling fluid under pressure; the improved structure comprising (d) a nozzle (i) fluidly connected to the bore, (ii) having a discharge tip pointing upward, and (iii) forming means for directing all fluid in the bore upward, (e) a discharge passage through the bit in line with the discharge tip, thus pointing upward and discharging outside the bit, (f) the bottom of the discharge passage is within one-half maximum cone diameter of the bottom of the bit, (g) said discharge tip of the nozzle extending inside the discharge passage, and said discharge passage larger than the nozzle, thus forming (h) a chip clearance between the nozzle and discharge passage, (j) so that as fluid is pumped through the bore to the bit that a suction is formed at the discharge passage to suck up the chips through the discharge passage from around the cone.

Claim 4

In a drill bit having (a) at least one cone having a maximum diameter journaled for rotation at the bottom, (b) a bore for drilling fluid at the top, and (c) means for connecting said bore to a source of drilling fluid under pressure; the improved structure comprising (d) a nozzle (i) fluidly connected to the bore, (ii) having a discharge tip pointing upward, and (iii) forming means for directing all fluid in the bore upward, (e) a discharge passage through the bit in line with the discharge tip, thus pointing upward and discharging outside the bit, (f) the bottom of the discharge passage is within one-half maximum cone diameter of the bottom of the bit, (g) said discharge tip of the nozzle extending inside the discharge passage, and said discharge passage larger than the nozzle, thus forming (h) a chip clearance between the nozzle and discharge passage, (j) so that as fluid is pumped through the bore to the bit that a suction is formed at the discharge passage to suck up the chips through the discharge passage from around the cone.

Claim 5

The invention as defined in claim 2 wherein there are (k) two cones and (m) a nozzle and discharge passage for each cone.

Claim 6

The invention as defined in claim 3 with an additional limitation of (n) the nozzle is attached to the bit by a union.

Claim 7

The invention as defined in claim 4 wherein said discharge tip has three outwardly diverging ports.