Patent EP0106702A2 successfully refreshed from Google Patents.
EP0106702A2
Expired / Lapsed
EP
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Drill bit assembly having improved operational life
Assignee: DRUMCO
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Filing: 1983-10-18
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Granted: —
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Expires: 2003-10-18
Abstract
Abstract A drill bit assembly has an elongated housing in which a drill is provided with a generally cylindrical shape for receiving an enlarged tool end with somewhat greater diameter, the tool having cutting cones for cutting a drill hole in material to be drilled. Air is fed to a plenum chamber within the housing out of which are fed two air flows. The first flow is directed to the region of the cutting cones and is of reduced magnitude sufficient only for removing dust and cuttings away from the bit assembly up along the sides of the bit. A plurality of vanes are provided on the housing to direct the first flow into a helical path the general pitch of the vanes. The vanes are caused to overlap one another in the direction of flow. A plurality of jet nozzles are provided from the plenum chamber at the side of the housing intermediate each pair of vanes and aligned so that the second flow will be in line with the first flow and generally parallel to the vanes in the general direction of the drill end and away from the cutting cones. Centrifugal force thus imparted keeps particles away from the drill bit and the pipe extensions and thereby reduces wear.
Inventors
- 👤 Donald David Drummond
- 👤 Roy Wilbert Wood
- 👤 Walter Frank Johnsey
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 16:40
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/44; E21B10/08; E21B10/18; E21B17/00; E21B17/22; E21B21/00; E21B21/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
238 words
A drill bit assembly for attachment to a rotary drill for drilling into a hard material and comprising: an elongated housing having a drill end adapted for attachment to extension means driven by a rotary drill and a tool end for receiving a tool having at least one cutting cone for engaging and cutting a drill hole into the material to be drilled; a plenum chamber within the housing for receiving pressurized-fluid from a fluid source; first conduit means for directing a first flow of fluid from the plenum chamber out of the housing adjacent the at least one cutting cone and into impingement upon material being drilled to pick up and remove along the housing dust and cuttings from the vicinity of the cutting cone; flow redirecting means supported on the housing for diverting the first fluid flow and the entrained dust and cuttings into a generally helical path around the housing; second conduit means for discharging a second flow of fluid out of the plenum chamber away from the cutting cone; and the first fluid flow being of sufficient magnitude for conveying the dust and cuttings from the vicinity of the cutting cone and into the second fluid flow for conveying the dust and cuttings away from the bit assembly and out of the drill hole and the fluid flows being directed as necessary in movement by the flow redirecting means into the generally helical path.
Claim 2
Dependent Claim
238 words
A drill bit assembly for attachment to a rotary drill for drilling into a hard material and comprising: an elongated housing having a drill end adapted for attachment to extension means driven by a rotary drill and a tool end for receiving a tool having at least one cutting cone for engaging and cutting a drill hole into the material to be drilled; a plenum chamber within the housing for receiving pressurized-fluid from a fluid source; first conduit means for directing a first flow of fluid from the plenum chamber out of the housing adjacent the at least one cutting cone and into impingement upon material being drilled to pick up and remove along the housing dust and cuttings from the vicinity of the cutting cone; flow redirecting means supported on the housing for diverting the first fluid flow and the entrained dust and cuttings into a generally helical path around the housing; second conduit means for discharging a second flow of fluid out of the plenum chamber away from the cutting cone; and the first fluid flow being of sufficient magnitude for conveying the dust and cuttings from the vicinity of the cutting cone and into the second fluid flow for conveying the dust and cuttings away from the bit assembly and out of the drill hole and the fluid flows being directed as necessary in movement by the flow redirecting means into the generally helical path.
Claim 3
Dependent Claim
31 words
The bit assembly as recited in claim 1 wherein the second conduit means is oriented to direct the second fluid flow generally parallel to and between adjacent pairs of redirecting means.
Claim 4
Dependent Claim
34 words
The bit assembly as recited in claim 1 wherein the flow redirecting means comprises guide vanes which extend around the outer surface of the housing in a general path to provide a helical segment.
Claim 5
Dependent Claim
31 words
The bit assembly as recited in claim 3 wherein the guide vanes at their opposite ends overlap one another along elements of the housing in a plane with the housing axis.
Claim 6
Dependent Claim
39 words
The bit assembly as recited in claim 4 wherein the guide vanes are fixed to a cylindrical wall surface of the elongated housing over essentially their entire length, the cylindrical surface being smaller in diameter than the tool end.
Claim 7
Dependent Claim
46 words
The bit assembly of claim 5 in which the guide vanes extend the outer diameter of the cylindrical wall of the housing to approximately the outer diameter of the tool and are of heavy duty construction to aid in stabilizing the bit in a drill hole.
Claim 8
Dependent Claim
80 words
The bit assembly as recited in claim 5 wherein the second means for discharging a flow of fluid out of the plenum chamber includes a plurality of jet nozzles positioned intermediate the vanes to discharge the second flow of fluid in the general direction of the first flow as directed by the vanes, wherein the axis of said nozzle is tilted from a plane in line with the axis of the housing into a line generally parallel to the vanes.
Claim 9
Dependent Claim
57 words
The bit assembly as recited in claim 7 wherein each of the second conduit means terminates in a jet nozzle at the opening of an elbow providing a channel through the housing wall, said nozzle and elbow being oriented to direct the second flow of fluid in line with the general path as determined by the vanes.
Claim 10
Dependent Claim
42 words
The bit assembly of claims 6, 7, or 8 in which there are three vanes employed with separate second conduit means intermediate each pair of said vanes and wherein the vanes extend around the housing more than 120° of the housing circumference.
References Cited (Backward Citations)
No citation records indexed.
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