EP1606073A1 - Trepan en forme de pelle - Google Patents

Trepan en forme de pelle

Info

Publication number
EP1606073A1
EP1606073A1 EP03816276A EP03816276A EP1606073A1 EP 1606073 A1 EP1606073 A1 EP 1606073A1 EP 03816276 A EP03816276 A EP 03816276A EP 03816276 A EP03816276 A EP 03816276A EP 1606073 A1 EP1606073 A1 EP 1606073A1
Authority
EP
European Patent Office
Prior art keywords
threads
drill bit
center point
spade drill
bit according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03816276A
Other languages
German (de)
English (en)
Other versions
EP1606073B1 (fr
EP1606073A4 (fr
Inventor
Juergen Wiker
Gregory A. Phillips
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Credo Technology Corp
Original Assignee
Credo Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Credo Technology Corp filed Critical Credo Technology Corp
Publication of EP1606073A1 publication Critical patent/EP1606073A1/fr
Publication of EP1606073A4 publication Critical patent/EP1606073A4/fr
Application granted granted Critical
Publication of EP1606073B1 publication Critical patent/EP1606073B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G15/00—Boring or turning tools; Augers

Definitions

  • the present invention relates to a drill bit. More specifically, the present invention relates to a spade-type drill bit.
  • FIG. 1A-C One conventional spade-type drill bit is depicted in Figs. 1A-C.
  • the bit 2 has a cutting head 6 situated at the end of an elongated shaft 4.
  • the opposite end of the shaft 4 is preferably provided with hexagonal flats 5 for engagement within a conventional drill chuck.
  • the head 6 is substantially flat and is provided with cutting edges 22 and 24.
  • a central point 16 is provided along the longitudinal axis of the bit 2.
  • the outer periphery of the bit is provided with cutting spurs 26, 28.
  • the point 16 of the rotating bit 2 penetrates the workpiece first and serves as a centering guide for the bit.
  • the spurs begin cutting into the material.
  • the cutting edges 22, 24 begin to shave thin layers of the workpiece.
  • the bit 2 continues to penetrate the workpiece until it is in the position shown in FIG. 2, at which point the spurs 26, 28 cut through the workpiece material.
  • the spurs 26 and 28 of conventional spade bits tend to grab the workpiece 30.
  • the spurs cause the drill bit to pull itself aggressively back into the material. This is generally due to the hook angle 6 on the spurs of the spade bit, which can be about 15" in a typical bit.
  • the user will frequently experience a jerk, typically referred to as grabbing. Grabbing may result in a wood blowout and splintering on the backside because the last portion of the uncut material 31 is pushed out rather than cut.
  • Another problem associated with this type of prior spade drill bit is that the spurs 26, 28 frequently experience high localized temperatures and high wear rates.
  • This bit 106 includes a shaft 104 having hex drive features 105 at one end and terminating in a drill head 106 at the opposite end.
  • the head 106 includes a central point 116 and two cutting edges 122, 124.
  • the cutting edges 122, 124 of the bit 102 in FIGS. 3A-C are rounded so that the edges exit the workpiece material at essentially the same time, as shown in FIG. 4. This configuration reduces the risk of blowout and splintering of a wood workpiece, and reduces the wear and temperature problems associated with the bit 2.
  • the head of the bit in FIGS. 3A-C can be modified as shown in FIG. 5. More specifically, center point 116' of the head 106' is threaded so that the lateral edges of the point 116' define a series of grooves 137.
  • the threaded point 116' allows the bit to be self-feeding. In other words, as the bit of FIG. 5 is rotated, the threaded point engages the workpiece and draws the bit into the material. This feature greatly reduces the thrust force that must be applied by the user to penetrate the workpiece.
  • the threads on the point 116' of the bit shown in FIG. 5 can be provided in different pitches, or threads per inch. In a typical configuration, the threads will vary in the range of 16-26 TPI. A lower number of threads will cause the bit to penetrate more aggressively into the workpiece, and conversely for a greater number of threads.
  • the grooves 137 of the threaded point 116' can vary in depth along the length of the point. More particularly, the threads can have a greater depth at the base of the point 116' than at the tip. This feature makes the threaded tip 116' better able to withstand the impact of hitting a nail or other fastener embedded within the workpiece. Summary of the Invention
  • a spade drill bit in one embodiment, comprises a shaft having one end configured to be engaged to a driving tool and a cutting head attached at an opposite end of the shaft.
  • the cutting head includes a center point having a tip and a base and a pair of cutting edges extending generally radially outwardly from the base of the center point.
  • the center point is threaded and includes continuous threads adjacent the tip and discontinuous threads thereafter towards the base.
  • the continuous threads include a tapered root, and therefore an increasing thread depth toward the tip of the center point.
  • the tapered root arises in a side projection of the drill bit.
  • the threads have a substantially constant thread depth when viewed in a plan view projection.
  • the center point includes opposite flat surfaces that are contiguous with the discontinuous threads. These flat surfaces define the plan view projection in which the thread depth is constant.
  • the center point includes opposite side edges interposed between the opposite flat surfaces.
  • the discontinuous threads are defined on these opposite side edges.
  • the cutting head preferably includes a spur defined at an outboard end of each of the cutting edges, so that the drill bit includes a pair of radially outwardly disposed spurs.
  • the cutting head includes opposite flat surfaces and opposite sides interposed between the flat surfaces. These opposite flat surfaces are contiguous with the flat surfaces of the center point.
  • the cutting head can include exterior thread defined in the opposite sides. The threads of said center point and the exterior threads of the cutting head preferably have substantially the same thread pitch. However, in certain embodiments, the exterior threads have a thread depth less than a thread depth of the threads of the center point.
  • the continuous threads extend a predetermined distance form the tip of the center point. In certain embodiments, the continuous threads extend about two revolutions from the tip.
  • the discontinuous threads continue from the continuous threads and terminate above the base of the center point. In embodiments that include the outboard spurs, the discontinuous threads terminate at a line extending between the spurs.
  • FIGS. 1A, 1 B and 1C are respectively a top view and a side and edge projection view of a conventional spade drill bit.
  • FIG. 2 illustrates the conventional spade bit of FIGS. 1A-C exiting a wooden workpiece.
  • FIGS. 3A, 3B and 3C are respectively a top view and a side and edgewise view of an improved spade drill bit design.
  • FIG. 4 illustrates the improved spade bit of FIGS. 3A-C exiting a wooden workpiece.
  • FIG. 5 is a depiction of the improved spade bit of FIGS. 3A-C with a threaded center point.
  • FIG. 6 is a top view of a spade drill bit in accordance with one embodiment of the present invention.
  • FIG. 7 is an enlarged view of the threaded point of the spade drill bit designated as area 7 in FIG. 6.
  • FIG. 8 is an enlarged side view of the threaded point depicted in FIG. 7.
  • FIG. 9 is a perspective view of a spade drill bit in accordance with an alternative embodiment of the invention.
  • FIG. 10 is a representation of the drill it shown in FIG. 9 with the side edges substantially parallel.
  • FIG. 11 is a representation of the drill it shown in FIG. 9 with the side edges converging toward the shaft of the bit.
  • FIG. 12 is a representation of the drill it shown in FIG. 9 with the side edges diverging toward the shaft of the bit. Detail Description of the Invention
  • a spade-type drill bit 202 includes a shaft 204 terminating in a driving end 205.
  • a cutting head 206 is formed at the opposite end of the shaft.
  • These components of the drill bit 202 can be similar to the like components of the bits 2 and 102 in FIGS. 1A-c and 3A-C, respectively.
  • the driving end 204 can have a hex configuration to mate with a drill chick and the head 206 can have a flat, spade profile.
  • the head 206 includes a center point 216 and cutting edges 222 and 224, like both prior drill bits described above.
  • the head 206 of the present embodiment can include spurs 226 and 228, similar to the spurs 26 and 28 of the bit shown in FIGS. 1A-C.
  • the cutting head 206 includes angled surfaces 223 and 225 corresponding to the cutting edges 222 and 224, as shown in FIG. 9. These surfaces are angled in the direction of rotation of the drill bit.
  • the side edges 220 can include a rake angle at the upper end of the edges adjacent the angled surfaces 223, 225.
  • the head 206 is not identical to the prior drill bits of FIGS. 1-5.
  • the center point 216 is threaded, as shown in the enlarged detail views of FIGS. 7 and 8.
  • the center point 216 includes a series of threads 240 extending substantially along the length (or height) of the point 216.
  • the threads 240 extend from the tip of the center point 216 nearly to its base 217, at least where the bit 202 is a large drill bit (i.e., about 7/16 and larger).
  • the threads preferably terminate above the base the tip 218 of the center point.
  • the threads 240 preferably terminate before reaching the outer diameter of the head 206. In other words, the threads terminate at a height above the cutting edges 222, 224 that is approximately equal to the height of the spurs 226, 228 above the edges.
  • the center point 216 includes opposite flat surfaces 230 that coincide with the flat surfaces 218 of the head 206 (FIG. 6).
  • the threads 240 then form edge-wise threads 242 along the tapered side edges of the center point, as shown in FIG. 7. These threads continue to the tip 218 of the center point.
  • the threads 240 include a root 244 and crest 245 which define a thread depth d.
  • this depth is constant with respect to this plan view projection of the drill bit 206.
  • This constant depth d makes the drill bit 206 a fast starting bit that requires only minimal pressure to start in most types of wood. In a specific embodiment, this thread depth d is about 0.05 inches.
  • the side view of the threaded center point 216 presents a different impression.
  • the threads 240 include a tapered root 246 near the tip 218 of the center point, as shown in FIG. 8.
  • the root is tapered at an angle A, which in a preferred embodiment is essentially the same as the angle of taper of the center point in its plan view projection shown in FIG. 7.
  • this angle A is an included angle of about 28-45 degrees depending upon the size of the drill bit 206. For a 1 Vz inch bit, the angle A can be about 33 degrees.
  • the crest 247 of the threads 240 in this portion of the center point preferably fall at the same crest diameter as the crest 245 for the lower portion of the threads 240.
  • the threads 240 exhibit an increasing depth toward the tip 218 of the center point.
  • the threads 240 commence at a leading edge 248 which facilitates initial penetration of the threaded center point 216 into the workpiece.
  • the threads 240 of the center point 216 combine a self-starting feature with a self-driving feature. In other words, with the exposed leading edge 248 of the threads, the bit can easily penetrate the workpiece.
  • the continuation of the threads along the center point 216 draws the bit toward the workpiece with only minimal thrust pressure being exerted by the user on the drill.
  • These features of the threads 240 combine to reduce the wear experienced by the center point.
  • the resulting spade drill bit provides a smoother drilling action at a quicker rate than conventional prior drill bits.
  • the smoother drilling action and feed rate generates a better quality drilled hole in the workpiece, particularly is the workpiece material is wood.
  • the threads 240 can be provided in different pitches depending upon the particular application for the bit. In general, lower pitch bits drill faster into the workpiece, while higher pitches result in slower drilling rates.
  • the threads 240 can have a pitch of 16 TPI, which is particularly well-suited for softer wood materials. On the other end of the spectrum, a pitch of 26 TPI is ideal for hard woods. It has been found that a pitch of 20 TPI is optimum for most woods used in building and construction. This thread pitch works well in both soft and hard woods, with an acknowledged decrease in drilling speed when used in hard woods.
  • the center point is threaded only on the side edges of the point.
  • This threading represents an improvement over earlier drill bits because it provided a self- feeding characteristic to the bit.
  • the present invention represents an improvement over this feature by the inclusion of substantially continuous threads 247 at the tip 218 of the center point 216. These threads continuously penetrate the workpiece as the bit drives deeper into the material, which reduces the thrust force that must be maintained on the drill over the prior drill bits.
  • the exposed leading edge 248 of the threads 240 allows the center point 216 to initially penetrate the workpiece than the prior bit designs.
  • the center point 216 of the illustrated embodiment includes a further feature in the form of a flute 250 defined on the opposite flat surfaces 230 of the center point. These flutes 250 improve removal of chips generated by the center point 216 as it drills into the workpiece. As shown best in FIG. 7, this flute 250 begins just below the lower end of the continuous threads 247 and continues into the flat surface 218 of the head 206, just below the cutting edges 222, 224.
  • the continuous threads pump the chip material upward through the brief extent of the continuous threads 247. As the center point penetrates further nto the workpiece, the chip volume increases.
  • the increasi ng chip volume would tend to clog the initial bored hole formed by the center poi nt, thereby increasing the required thrust force, increasing the heat build-up in the bore, and decreasing the life of the threaded center portion 216.
  • the flute 250 relieves the drilled hole of the chip material as quickly as possible, while still preserving the beneficial features of the continuous threads 247.
  • the drill bit 202 includes smooth sides 220.
  • a drill bit 202' includes threads 260 defined in the comparable sides 220'.
  • the drill bit 202' can include similar features to the bit 202 shown in FIG. 6.
  • the sides include a series of grooves 260 substantially along the entire extent of the sides 220'. These grooves 260 can be formed in lathe machine configured to turn threads.
  • the grooves 260 on the opposite sides 220' of the head 206' essentially constitute segments of a helical thread running the length of the head 206'.
  • outer threads 260 pick up where the threads 240 of the center point 216 leave off.
  • the threads 260 of the head 206' engage the workpiece material and help drive the bit into the workpiece.
  • the threads 260 continue to draw the bit into the workpiece as the cutting edges 222, 224 begin shaving workpiece material.
  • One benefit provided by the outer threads 260 is realized when the spurs 226, 228 reach the end of the workpiece bore. As explained in the PCT publication WO 98/05459 discussed above, one problem with spurs on spade drill bits is that the spurs tend to cause grabbing near the end of the cut. It has been found that the addition of the threads 260 to the sides 220' of the bit head 206' helps maintain a smooth advance of the drill bit through the material, even as the bit breaks through the opposite side of the workpiece.
  • the threads 260 follow the same thread pitch as the threads 240 of the center point 216.
  • the threads 260 preferably have a shallower thread depth than the threads of the center point.
  • the threads 260 have a depth about half the depth d of the center point threads 240.
  • the threads 260 have a depth of about 0.20-0.25 inches. This shallower thread depth is preferable because the threads 260 are sweeping through a larger circumferential path than the threads of the tapered center point 216.
  • the extent of the continuous threads can be varied depending upon the particular drill application. In the most preferred embodiment, the continuous threads 240 extend for about two revolutions for a standard thickness drill bit (i.e., about 0.080 inches thick). The extent of the continuous threads 247 can also depend upon the length (or height) of the center point. In the typical spade bit, the center point 216 projects about 0.50 inches above the cutting edges 222, 224 of the head 206. In this typical case, the continuous threads 247 extend about 0.10 inches from the tip 218.
  • the sides 220' of the drill bit 202' are substantially parallel, as shown in FIG. 10.
  • the sides bearing the threads 260 can be arranged at alternative orientations, as shown in FIGS. 11 and 12.
  • the sides 220" can converge toward the bit shaft 204 at an angle M " . This convergence can commence at the spurs or can begin downstream of the cutting edges 222, 224.
  • the sides 220'" can diverge toward the bit shaft 204, as shown in FIG. 12.
  • the sides 220'" can diverge at an angle M + . (It is understood that the threads 260 are also present on the sides 220" and 220'").
  • both the converging and diverging angles are on the order of about 1 degree.
  • the diverging sides 220'" can help stabilize the drill bit as it drives deeper into the workpiece.
  • the converging sides 220" can reduce the force required for the rotating drill bit to penetrate into the workpiece.
  • the threaded diverging sides 220'" can also produce a smoother or "cleaner” bore through the workpiece as the increasing diameter of the diverging threads gradually widen the bore.
  • the selection of the parallel 220', converging 220", or diverging 220'" sides can depend upon the nature of the workpiece material and on the driving torque of the drill to which the drill bit is engaged.
  • the drill is a portable electric drill
  • the diverging drill bit of FIG. 12 may be desirable.
  • the drill bits of the illustrated embodiments can be formed according to known processes, such as the process described in U.S. Patent No. 5,433,561 , which has been incorporated by reference.
  • the outer threads 260 on the sides 220 of the drill head 206 are preferably formed using a lathe configured for producing helical threads.
  • the threads 240 on the center point are preferably formed using a tapered thread cutting die. It is understood that the tapered die will not cut threads in the flat surfaces 230 of the center point, since these surfaces reside below the tapered diameter of the center point. On the other hand, the portion of the center point adjacent the tip 218 will maintain its circular tapered configuration since the tapered diameter at this portion is less than the thickness of the bit head 206.
  • the outer threads 260 may be used alone, in combination with the threads 240 of the center point, or not at all, depending upon the requirements of the drill bit. In smaller bits, it is preferable to use only the threaded center point, without the threads on the sides of the bit head.
  • one constant among the contemplated embodiments is the provision of the continuous threads at the tip 218 of the center point that merge into the discontinuous threads at the flat surface portion of the center point.
  • the illustrated embodiments are best suited for drilling through wood materials.
  • the wood materials can range from soft to hard woods, with appropriate changes to the various dimensions, as mentioned above. It is contemplated that these bits can have application for boring through other materials having similar properties to wood materials.

Abstract

Trépan en forme de pelle (202) composé d'une tige (204) dont une extrémité (205) est conçue pour être accouplée à un outil d'entraînement, ainsi que d'une tête coupante (206) fixée à l'extrémité opposée de ladite tige (204). Cette tête coupante (206) comprend un point central (216) sur lequel sont définis des filets (240), y compris des filets continus (247) contigus à la pointe et des filets discontinus (242) en direction de la base.
EP03816276A 2003-03-11 2003-03-11 Trepan en forme de pelle Expired - Lifetime EP1606073B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2003/007184 WO2004080632A1 (fr) 2003-03-11 2003-03-11 Trepan en forme de pelle

Publications (3)

Publication Number Publication Date
EP1606073A1 true EP1606073A1 (fr) 2005-12-21
EP1606073A4 EP1606073A4 (fr) 2011-04-20
EP1606073B1 EP1606073B1 (fr) 2012-11-21

Family

ID=32986329

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03816276A Expired - Lifetime EP1606073B1 (fr) 2003-03-11 2003-03-11 Trepan en forme de pelle

Country Status (4)

Country Link
EP (1) EP1606073B1 (fr)
CN (1) CN1758977B (fr)
AU (1) AU2003225722A1 (fr)
WO (1) WO2004080632A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7246976B2 (en) * 2003-10-21 2007-07-24 Textron Innovations Inc. Spade bit
US7416371B2 (en) 2004-05-04 2008-08-26 Irwin Industrial Tool Company Wood boring bit with increased speed, efficiency and ease of use
US7473056B2 (en) * 2005-10-20 2009-01-06 Irwin Industrial Tool Company Spade bit
GB2431368B (en) * 2005-10-20 2010-03-03 Irwin Ind Tool Co Spade bit
US8979444B2 (en) 2007-06-07 2015-03-17 Robert Bosch Gmbh Cutting bit adapted to cut metal and wood and associated method
WO2009021384A1 (fr) * 2007-08-10 2009-02-19 Qi Zhang Mèche plate destinée à percer à travers un matériau en bois
US8262325B2 (en) 2007-10-10 2012-09-11 Robert Bosch Gmbh Spade bit having threaded conical tip portion
US7887269B2 (en) 2007-10-10 2011-02-15 Robert Bosch Gmbh Spade bit with improved cutting geometry
WO2009049069A1 (fr) 2007-10-10 2009-04-16 Robert Bosch Gmbh Trépan ayant une caractéristique d'alésoir
EP3098042B1 (fr) * 2014-01-23 2018-04-04 Hangzhou Great Star Tools Co., Ltd. Mèche plate
USD863384S1 (en) * 2018-04-30 2019-10-15 Disston Company Spade drill bit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5291806A (en) * 1991-07-31 1994-03-08 Enderes Tool Company, Inc. Spade-type drill bit apparatus and method
WO1998005459A1 (fr) * 1996-08-08 1998-02-12 Vermont American Corporation Foret a langue d'aspic
DE10007736A1 (de) * 2000-02-02 2001-08-16 Giebmanns Karl Heinz Holzbohrer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US248854A (en) * 1881-11-01 Auger
US2627292A (en) * 1947-09-08 1953-02-03 United Drill And Tool Corp Auger bit
US2883888A (en) * 1951-08-17 1959-04-28 Arthur H Stewart Boring tool and method for making same
US5286143A (en) * 1992-05-20 1994-02-15 Vermont American Corporation Wood bit and method of making

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5291806A (en) * 1991-07-31 1994-03-08 Enderes Tool Company, Inc. Spade-type drill bit apparatus and method
WO1998005459A1 (fr) * 1996-08-08 1998-02-12 Vermont American Corporation Foret a langue d'aspic
DE10007736A1 (de) * 2000-02-02 2001-08-16 Giebmanns Karl Heinz Holzbohrer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2004080632A1 *

Also Published As

Publication number Publication date
WO2004080632A1 (fr) 2004-09-23
CN1758977A (zh) 2006-04-12
CN1758977B (zh) 2012-12-05
EP1606073B1 (fr) 2012-11-21
EP1606073A4 (fr) 2011-04-20
AU2003225722A1 (en) 2004-09-30

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