WO2010025500A1 - Pilot bit - Google Patents
Pilot bit Download PDFInfo
- Publication number
- WO2010025500A1 WO2010025500A1 PCT/AU2009/001137 AU2009001137W WO2010025500A1 WO 2010025500 A1 WO2010025500 A1 WO 2010025500A1 AU 2009001137 W AU2009001137 W AU 2009001137W WO 2010025500 A1 WO2010025500 A1 WO 2010025500A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting
- pilot bit
- elongate body
- blades
- cutting edges
- Prior art date
Links
- 238000005520 cutting process Methods 0.000 claims abstract description 105
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 238000009412 basement excavation Methods 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 230000036346 tooth eruption Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 241000288140 Gruiformes Species 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 206010037833 rales Diseases 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/06—Dredgers; Soil-shifting machines mechanically-driven with digging screws
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
Definitions
- This invention relates generally to an earth excavation device, such as an earth boring device, and in particular, to a pilot bit for an earth boring device.
- Earth boring or excavation devices such as augers, generally comprise a rotating shaft having a cutting head mounted at a distal end thereof that acts to bore into the earth.
- the shaft typically comprises a spiral vane that extends behind the cutting heat! to convey dislodged or loosened earth away from a cutting head to the soil surface.
- a spiral vane that extends behind the cutting heat! to convey dislodged or loosened earth away from a cutting head to the soil surface.
- the cutting head of a conventional auger generally comprises shank plates or cutting blades forcutting through and boring into the earth.
- a pilot bit is also typically attached to the putting head so as to provide initial contact with the earth to initiate the hole such that it is sufficient to admit the following larger portions of the auger cutting head. Pilot bits also function to guide the auger and keep U boring in the desired direction. Tn this regard, pilot bits may assume a variety of configurations depending upon the type of earth being excavated.
- pilot bits typically comprise a first end portion for coupling to the rotating shaft of the cutting head of the auger and a second end portion having blades or cutting teeth formed thereon for breaking the earth.
- the number of blades and/or cutting teeth provided on the pilot bit significantly influences the drilling rate of the pilot bit, at> overcrowded bits impede (he How of earth being removed from (he blades. Hence, whilst a pilot bit with a number of blades and cutting teeth may cut through the earth more easily, if there is not sufficient capability to remove the loosened earth from the cutting blades, the drilling rate will be poor.
- pilot bits having a number of teeth or cutting blades may experience significant forces during use resulting in the need for continual replacement and/or repair of the bits, particularly when used to excavate rock and other hard material.
- lliere is a need to provide a pilot bit for an earth excavating device that provides tor improved drilling rates and reduced wear.
- a pilot bit for an earth excavating device comprising: an elongate body having a proximal end adapted for coupling to a rotating shaft of the earth excavating device and a distal end; and a plurality of blades extending radially from and being substantially cquidistantly spaced about the elongate body such that each blade extends in a spiral at least partially along a length of the elongate body; wherein, at least one of said blades has a plurality of cutting faces formed therein at predetermined distances along a length thereof, each cutting face having a cutting edge that extends substantially perpendicular to a longitudinal axis of the elongate body so as to define a plurality of cutting planes.
- each blade has a plurality of cutting faces formed therein at corresponding predetermined distances along a length thereof such that the corresponding cutting edges of the blades define the plurality of cutting planes.
- I Tic cutting edges of adjacent cutting faces formed in the blade may be each laterally displaced from the longitudinal axis of the elongate body.
- the cutting edges of adjacent cutting faces formed in the blade may be each laterally displaced from the longitudinal axis of (he elongate body such that they do not substantially overlap.
- the cutting edges of cutting faces located towards the distal end of the body may be laterally displaced closer to the longitudinal axis of the elongate body than the cutting edges of cutting faces located towards the proximal end of the elongate body.
- he distal end oflhe elongate body may comprise a spike member.
- lTie spike member may have a substantially triangular wedge shape terminating at a pointed end.
- llie spike member may further comprise one or more angular cutting edges configured to remove earth as the elongate body rotates.
- the proximal end of the body may have an internal recess formed therein lor receiving at least a portion of lhe rotating shaft of the earth excavating device to facilitate coupling thereto.
- One or more holes may be provided through the proximal end of the body to receive one or more fasteners to facilitate removable coupling with the rotating shaft and the body.
- the proximal end of the body may comprise at least two shoulder portions, each shoulder portion may have a cutting edge that extends substantially perpendicular to a longitudinal axis of the elongate body so as to del ⁇ ne a further cutting plane.
- Ilic cutting edges of the shoulder portions may be each lateral Iy displaced from the • longitudinal axis of the elongate body so as to project beyond the cutting edges of the blades.
- the cutting edges of the shoulder portions may be each laterally displaced from the longitudinal axis of the elongate body such that they do not substantially overlap with the cutting edges of the blades.
- Figure 1 is a side view of an auger assembly employing a pilot bit in accordance with one embodiment ol ' the present invention
- Figure 2 is a perspective view of the pilot bit of Figure 1 ;
- Figure 3 shows a bottom view of the pilot bit of Figure 1;
- Figure 4 shows a side view of the pilot bit of Figure 1 ;
- Figure 5 shows an end view of the pilot bit of Figure 1
- Figure 6 shows a top view of the pilot bit of Figure 1.
- the assembly 10 comprises an auger 12 having a pilot bit 20 attached to a distal end thereof.
- the auger assembly 10 may be mounted to a vehicle, such as a tractor or earth moving vehicle, having an auger drive system for rotating the auger assembly 10 and for applying a downward force to the auger assembly 10 to facilitate boring into the earth.
- Ilic auger 12 includes a shall 11 that is typically driven hy the nugcr drive system to rotate about its longitudinal axis.
- the shaft 11 has a pair of flutes 13 that are arranged in a double helix or spiral configuration about the shaft to function as flighting.
- the llules 13 define two paths for earth, loosened by the action of the auger assembly 10, to 5 flow as the shaft 1 1 is rotated to penetrate into the earth, These flow paths act to remove loosened earth away from the boring head 14 and pilot bit 20, during excavation.
- the distal end or boring head 14 of the auger 12 hai a pair of plates 15 attached thereto.
- the plates 15 extend from the llutes 13 of the auger 12 and arc attached to the flutes 13 io by way of bolts or the like, such that they can be replaced where necessary.
- the plates ] 5 may assume a variety of forms and may include teeth or the like to aid in cutting the earth as the shall 11 rotates.
- the plates 15 extend radially from the shaft 1 1 to ensure that a clearance is cut into the earth to enable passage of the following auger 12.
- a pilot bit 20 in accordance with one embodiment of the present invention is configured 15 to be fitted to the shaft 1 1 of the boring head 14 in the manner as shown in Hgurc I.
- the pilot bit 20 comprises a conical main body 25 having a proximal end 27 that tapers towards a distal end 23.
- the proximal end 27 has an internal recess 29 formed in the surface thereof that receives a male portion (not shown) of the shaft 1 1.
- pilot tip 20 19 are formed through opposing side walls of the body 25, adjacent the proximal end 27, so as to communicate with the internal recess 29.
- the holes 19 arc aligned so as to receive a boll 18, or similar fastening member, which passes through a corresponding hole (jiot shown) formed in the male portion of the shaft 11, to secure the pilot bit 20 to the shaft 11.
- a boll 18, or similar fastening member which passes through a corresponding hole (jiot shown) formed in the male portion of the shaft 11, to secure the pilot bit 20 to the shaft 11.
- pilot bit 20 can be readily removed from the shall 11 by removing the bolt 18, as necessary. It will be appreciated that other mechanisms may also be employed to releasably secure the pilot bit 20 to the boring head 14 of Hie auger 12 and still fall within the spirit of the present invention.
- the rotational axis of the pilot bit 20 is substantially colHncar with the rotational axis of the
- the distal end 23 of the pilot bit 20 has a spike member 22 projecting therefrom.
- the spike member 22 is in the form of a triangular wedge that tapers to a point 22a.
- the point 22a of the spike member 22 forms a leading tip that provides initial contact with the earth to create fin initial hole in the earth.
- the 35 spike member 22 is initially brought into contact with the earth being drilled under force, to break the surface of the earth for the commencement of excavation.
- the spike member 22 is caused Io rotate. Rotation of the spike member 22 resulLs in (he spike member 22 performing a drilling function.
- the leading edges of the member 22 act to shave away the earth to provide a hole in the earth of gradually increasing diameter.
- Rotation of the spike member 22 also functions to centre the pilot bit 20 thereby reducing the likelihood of the pilot bit 20 drifting or laterally shifting under rotational-motion. This is particularly important where the assembly is being used to excavate earth of varying density and hardness, where lateral shilling of the auger is more likely.
- the main body 25 of the pilot bit 20 has a pair of radially extending blades 21 formed integral therewith, llie blades 21 are spaced equidislanlly about the longitudinal axis of (he main body 25 and extend from adjacent the proximal end 27 to adjacent the base of the spike member 22 in a helical or spiral manner, as shown. Kach of the blades 21 have a substantially identical configuration as shown. ⁇ s is shown more clearly in Figure 4, the extent to which the blades 21 project from the central axis of the body 25 reduces as the blades 21 approach the spike member 22 such that the pilot bit 20 has an overall conical shape.
- the base of the spike member 22 is formed to blend into the body 25 so as to provide a relatively smooth transition between the blades 21 and the spike member 22.
- ⁇ first cutting face 28 is provided in the most distal region of the blades 21, namely that region of the blades 21 immediately adjacent the base of the spike member 22. ⁇ s is shown more clearly in Figure 6, the first cutting face 28 of the blades 21 has a cutting edge 28a that extends substantially orthogonal to the central longitudinal axis of the main body 25. Tn such an arrangement, the laterally extending first cutting edge 28a projects beyond the central axis of the body 25 a distance greater than the width of the base of the spike member 22.
- the cutting edges 28a of the first cutting faces 28 act to cut away the earth in a chisel-like manner to form a hole having a diameter substantially equivalent to the combined distance of lateral projection of the opposing first cutting edges 28a of the blades 21 from the central axis of the body 25.
- the first cutting edges 28a of the blades 21 follow behind the spike member 22, the first cutting edges 28a act U) form a hole in the earth having a greater diameter than the hole formed by the spike member 22. ⁇ s the hole formed by the first cutting edges 28a of the blades is only marginally wider in diameter than the hole formed by the rotating spike member 22, (he amount of work performed by the l ⁇ rst cutting edges 28a is reduced. Tn this regard, the first cutting edges 28a define a first cutting plane of the pilot bit 20.
- the helical or spiral region ol ' lhe blades 21 extend away from the first cutting face 28 towards the proximal end 27.
- Each of the blades 21 have a leading edge formed therein that is disposed in advance of the zone of connection of the blade 21 with the body 25,
- each blade 21 projects beyond the central axis of Uie body 25 a distance greater than the most lateral region of first cutting edges 28a, and progressively increases as the blades 21 travel away from the first cutting edge 28a towards the proximal end 27. In (his arrangement, the leading edge of the blades 21 acts to further remove a portion of (he earth as the bit 20 rotates by shaving away the
- the portion of earth removed by the leading edges of the blades 21 is significantly less that that removed by the first cutting edges 28a, due to the gradual increase in the projection of the blades 21 from the central axis of the body 25 with respect to the lateral projection of the first cutting edges 28a.
- the thickness of the blades 21 also increases as the blades 21 travel from lhe
- the helical nature of the blades 21 functions to provide a path for removal of the loosened earth away from first cutting edges 28a and the leading edges of the blades 21.
- a second cutting face 26 is formed in the blades 21 at a point intermediate the distal end 20 23 and the proximal end 27 of the body 25.
- Lhe second cutting face 26 has a laterally extending cutting edge 26a that extends substantially orthogonal to the central longitudinal axis of the main body 25.
- the second culling edges 26a arc configured such that they arc located beyond the lateral projection of the first cutting edges 28a.
- the second cutting edges 26a define a second cutting plane of the pilot bit 20 that cuts a hole having a wider diameter to the hole cut by (he preceding portion of the bit 20.
- the second cutting edges 26a form a hole in the earth having a diameter * x' of between around 70 90 mm, preferably around 81 mm.
- the proximal end of the body 25 has a pair of opposed cutting shoulders 24 formed therein.
- the cutting shoulders 24 define the widest portion of the pilot bit 20, spanning a distance *y' of between around 85mm- 125mm, preferably around 105 mm.
- the 35 cutting shoulders 24 each have a cutting edge 24a that extends substantially orthogonal to the central longitudinal axis of the main body 25.
- Cutting edges 24a are configured to contact the earth as the pilot bit 20 rotates, thereby excavating a greater diameter of earth than the preceding bit 20.
- the cutting shoulders 24 are configured such thai the cutting edges 24a arc located beyond the lateral projection of the second culling edges 28a.
- the culling shoulders 24 define a third cutting plane of the pilot bit 20 that forms a hole having a wider diameter to that cut by the preceding portion of the pilot bil 20.
- the pilot hit 20 provides at least a three stage cutting process for excavating a hole in the earth for providing a passage for the auger 12.
- first cutting edges 28a, second cutting edges 26a, and the cutting shoulders 24 of the pilot bit 20 each work together to loosen and remove the earth in three distinct steps or stages.
- the leading edges of the blades 21 are also able to perform an earth cutting function as well as a removal function to aid in penetration of the pilot bil 20 into the earth.
- the spike member 22 also provides another stage of earth removal. Due to the progressive stages of earth removal to form a hole of a particular diameter, the amount of work performed by the pilot bit 20 to form such a hole in the earth is reduced, particularly in comparison to a pilot bit having a single cutting plane.
- pilot bil 20 of the present invention is able to more aggressively penetrate into the earth to provide improved boring rales and better control of the overall process.
- the blades 21 of the pilot bit 20 are arranged to have an attack angle O of between 120° - 160 u .
- the attack angle ⁇ is lhe angle formed between the rotational axis of the blades 21 and the work surface, defining the helix angle of the blades 21 .
- H has been found thai such an attack angle also provides for more aggressive penetration of the pilot bit through the earth, thereby greatly increasing drilling rates of the auger 12.
- the spike member 22, first and second cutting edges 28, 26, cutting shoulders 24 and blades 21 may be provided with one or more tiles to aid in earlli removal.
- ITie tiles may be welded or otherwise attached to the surface of the body 25 of the pilot bit 20 and may be in the form of conventional tungsten tiles.
- the surfaces of the pilot bit 20 may include granules of tungsten welded therein so as to be integrally formed with the body 25 to facilitate improved penetration of the pilot bit 20 into the earth during use.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ592774A NZ592774A (en) | 2008-09-04 | 2009-09-03 | Pilot bit |
AU2009290128A AU2009290128B2 (en) | 2008-09-04 | 2009-09-03 | Pilot bit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2008904590 | 2008-09-04 | ||
AU2008904590A AU2008904590A0 (en) | 2008-09-04 | Pilot bit for an auger |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010025500A1 true WO2010025500A1 (en) | 2010-03-11 |
Family
ID=41796633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2009/001137 WO2010025500A1 (en) | 2008-09-04 | 2009-09-03 | Pilot bit |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2009290128B2 (en) |
NZ (1) | NZ592774A (en) |
WO (1) | WO2010025500A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2489085A (en) * | 2011-03-15 | 2012-09-19 | Brian Peter Dunn | Cutting tool for repairing pot holes by creating a circular area of repair in damaged road |
US9163382B2 (en) | 2013-01-16 | 2015-10-20 | King Kutter, Inc. | Gearbox lock mechanism |
US9834999B2 (en) | 2011-07-13 | 2017-12-05 | King Kutter, Inc. | Post hole digger |
USD1009105S1 (en) * | 2021-09-08 | 2023-12-26 | Apex Brands, Inc. | Tri-paddle bit |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2639122A (en) * | 1949-11-01 | 1953-05-19 | Gerald A Petersen | Pilot bit for earth augers |
US3557887A (en) * | 1967-09-19 | 1971-01-26 | Watson Mfg Co | Auger-type pilot bit |
US3667559A (en) * | 1970-11-19 | 1972-06-06 | Pengo Corp | Pilot bit with multiple cutting edges |
US5476149A (en) * | 1994-04-18 | 1995-12-19 | Pengo Corporation | Pilot bit |
-
2009
- 2009-09-03 NZ NZ592774A patent/NZ592774A/en not_active IP Right Cessation
- 2009-09-03 AU AU2009290128A patent/AU2009290128B2/en not_active Ceased
- 2009-09-03 WO PCT/AU2009/001137 patent/WO2010025500A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2639122A (en) * | 1949-11-01 | 1953-05-19 | Gerald A Petersen | Pilot bit for earth augers |
US3557887A (en) * | 1967-09-19 | 1971-01-26 | Watson Mfg Co | Auger-type pilot bit |
US3667559A (en) * | 1970-11-19 | 1972-06-06 | Pengo Corp | Pilot bit with multiple cutting edges |
US5476149A (en) * | 1994-04-18 | 1995-12-19 | Pengo Corporation | Pilot bit |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2489085A (en) * | 2011-03-15 | 2012-09-19 | Brian Peter Dunn | Cutting tool for repairing pot holes by creating a circular area of repair in damaged road |
US9834999B2 (en) | 2011-07-13 | 2017-12-05 | King Kutter, Inc. | Post hole digger |
US9163382B2 (en) | 2013-01-16 | 2015-10-20 | King Kutter, Inc. | Gearbox lock mechanism |
USD1009105S1 (en) * | 2021-09-08 | 2023-12-26 | Apex Brands, Inc. | Tri-paddle bit |
Also Published As
Publication number | Publication date |
---|---|
AU2009290128A1 (en) | 2011-07-28 |
NZ592774A (en) | 2013-10-25 |
AU2009290128B2 (en) | 2016-03-10 |
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