CN1758977B - Spade drill bit - Google Patents
Spade drill bit Download PDFInfo
- Publication number
- CN1758977B CN1758977B CN03826138.3A CN03826138A CN1758977B CN 1758977 B CN1758977 B CN 1758977B CN 03826138 A CN03826138 A CN 03826138A CN 1758977 B CN1758977 B CN 1758977B
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- center point
- drill bit
- screw thread
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- blade
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- 238000005520 cutting process Methods 0.000 claims abstract description 44
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 29
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 description 22
- 239000002023 wood Substances 0.000 description 9
- 230000006872 improvement Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 206010020843 Hyperthermia Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
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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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Drilling Tools (AREA)
Abstract
A spade drill bit comprises a shaft having one end configured to be engaged to a driving tool and a cutting head attached at an opposite end of said shaft. The cutting head includes a center point having threads defined thereon, including continuous threads adjacent the tip and discontinuous threads thereafter toward the base.
Description
Technical field
The present invention relates to a kind of drill bit.More specifically, the present invention relates to shovel the drill bit of shape type.
Background technology
A kind of traditional Spade drill bit is shown in Figure 1A-C.Bore 2 and have the cutting head 6 that is positioned at the slender axles end.The opposite end of axle 4 preferably is equipped with and is used to be engaged on the inner hexagon plane 5 of traditional drill chuck.As best image among Figure 1B, head 6 is flat basically and be equipped with cutting edge 22 and 24.Center top 16 is along the longitudinal axis setting of boring 2.The excircle that bores is equipped with cutting straight- tooth 26,28.
In use, top 16 of rotary drilling 2 at first thrust workpiece and serve as the centre pilot device that is used to bore.In the time of in boring further propelling workpiece, straight-tooth begins cutting material.At last, as the bit is advanced further, cutting edge 22,24 begins to scrape the thin layer of turning work piece.Bore 2 and continue to thrust workpiece till it is in position as shown in Figure 2, penetrate workpiece material in these place's straight- tooth 26,28 cuttings.When the user of drill bit prepared to exit the hole, the straight- tooth 26 and 28 that traditional shovel shape bores often pulled workpiece 30.
In case the outermost portion of straight-tooth leaves material 30, straight-tooth just makes the drill bit pulling self invade in the material backward.This is normally owing to the anterior angle 6 on the straight-tooth of shovel shape brill, and this angle is approximately 15 in typical boring ".When drill bit began to draw in the material by straight-tooth, the user will run into continually and be commonly called the wrench that pulls.Pull and can cause the explosion of wooden rear portion and split because not the last part of cutting material 31 be pushed out rather than be cut off.
Another problem relevant with the existing Spade drill bit of this type is that straight- tooth 26,28 stands localized hyperthermia and high wear rate continually.In order to address these and other problems, studied the green bit 106 shown in Fig. 3 A-C.This brill 106 comprises the axle 104 that at one end has hex drive features 105 and stop at drill bit 106 places of opposite end.Drill bit 106 comprises center point 116 and two cutting edges 122,124.
Opposite with the existing brill shown in Figure 1A-C, the cutting edge 122,124 of the brill of Fig. 3 A-C is round, and is so the edge leaves workpiece material in the substantially the same time, as shown in Figure 4.The risk that this configuration has reduced the wood workpiece explosion and split, and reduced and bore 2 relevant wearing and tearing and temperature problems.
The head of the brill among Fig. 3 A-C can that kind as shown in Figure 5 improve.More particularly, head 106 ' center point 116 ' be threaded, like this, top 116 ' lateral margin just define a series of grooves 137.It is self-feeding that threaded top 116 ' permission is bored.In other words, when the rotation of the brill of Fig. 5, threaded top engagement workpiece and drawing the bit in the material.When this characteristic has reduced to thrust workpiece institute greatly the user the thrust that must apply.
Can to brill as shown in Figure 5 top 116 ' on screw thread the different pitch or the number of threads of per inch are provided.In typical configuration, screw thread changes in the scope of 16-26 screw thread per inch (TPI).Fewer purpose screw thread makes brill more effectively thrust workpiece, and the screw thread more for number is then opposite.In a kind of improvement, threaded top 116 ' the degree of depth of the groove of arranging along top length 137 can be different.More particularly, screw thread top 116 ' the degree of depth at pedestal place can be greater than the place, tip.This characteristic makes threaded most advanced and sophisticated 116 ' more can resist the perhaps impact of the securing member of other embedding interior of bump nail.
Summary of the invention
In one embodiment of the invention, a kind of Spade drill bit is provided, it comprises that having an end is designed to and the axle of driven tool engagement and the cutting head at the place, opposite end that is connected axle.Cutting head comprises the center point and the common a pair of cutting edge that extends radially outward from the pedestal of center point with most advanced and sophisticated and pedestal.In a characteristic of the present invention, center point is threaded and comprises the continuous thread at contiguous most advanced and sophisticated place and thereafter towards the discontinuous screw thread of pedestal.
In certain embodiments, continuous screw thread comprises tapered root, and has therefore increased the depth of thread towards the tip of center point.Tapered root occurs in the side projection figure of drill bit.On the other hand, when in plane figure, observing, screw thread has the depth of thread of substantial constant.More particularly, center point comprises the relative plane with discontinuous screw thread adjacency.These planes define the wherein constant plane figure of the depth of thread.
In a preferred embodiment, center point comprises the relative lateral margin that inserts between the relative plane.Discontinuous screw thread is limited on these relative lateral margins.Cutting head is preferably included in the straight-tooth of the outboard end place qualification of each cutting edge, and like this, drill bit comprises a pair of radially outwardly disposed straight-tooth.
In another embodiment, cutting head comprises relative plane and inserts the opposed side edges between the plane.The plane adjacency of plane that these are relative and center point.Cutting head can comprise the external screw thread that is limited in the opposed side edges.The screw thread of said center point and the external screw thread of cutting head preferably have substantially the same thread pitch.Yet in certain embodiments, the externally threaded depth of thread is less than the depth of thread of center point.
Continuous screw thread extends predetermined distance from the tip of center point.In certain embodiments, continuous screw thread extends about two revolutions from the tip.Discontinuous screw thread continues and above the pedestal of center point, stops from continuous screw thread.In comprising the embodiment of outboard spurs, discontinuous screw thread stops at the line place of between straight-tooth, extending.
An object of the present invention is to provide a kind of energy-conservation drill bit for this reason.Another object of the present invention provides a kind of drill bit design, and wherein smear metal more is easy to from the hole that gets out, remove.Another object of the present invention provides a kind of drill bit design, and it has reduced the vibration of boring and can produce the higher hole of quality.
Another object of the present invention provides a kind ofly to be had lower rate of depreciation and the time avoids the drill bit of too high local temperature in boring.Another object of the present invention provides a kind of drill bit, and when leaving the hole, this drill bit can leave wood workpiece under the situation that does not pull workpiece.
Another object of the present invention provides a kind of thread tapping and self-running drill bit.Through following explanation with accompanying drawing of writing, of the present invention these will become more apparent with other purpose.
To achieve these goals, the present invention proposes a kind of drill bit, comprising: the drive end part; Be connected to the handle of said drive end part; Be connected to the blade of said handle, said blade has the opposite face of pair of parallel, and said opposite face is coupled together by a pair of lateral surface that is parallel to said handle usually; A pair of side shoulder, thus extend internally and partly assemble the front end that forms said blade in center point from said lateral surface; The cutting edge part of forging along the front end of said blade; The part of wherein said blade along direction of rotation to front curve; And wherein each said side shoulder from said each lateral surface to said center point part to front curve; Wherein, said center point partly has a plurality of discontinuous first screw thread that is limited to wherein.
Preferably; Said center point part also has a plurality of continuous screw thread that is limited to wherein; Wherein: said center point partly comprises tip and pedestal; Said a plurality of continuous screw thread is positioned near the said tip of said center point part, and said a plurality of discontinuous first screw thread inserts between said a plurality of continuous screw threads and the said center point said pedestal partly.
Preferably, said a plurality of continuous screw thread comprises tapered root.
Preferably, said center point partly comprises the relative plane with said a plurality of discontinuous first screw thread adjacency.
Preferably, said center point partly comprises the relative lateral margin that inserts between the said relative plane, and the said a plurality of first discontinuous screw thread is limited in the said relative lateral margin.
Preferably, first degree of depth of said a plurality of discontinuous first screw threads is constant.
Preferably, second degree of depth of the part of said a plurality of continuous threads is constant, and said first degree of depth equals said second degree of depth.
Preferably; Said blade has a pair of cutting straight-tooth that upwards stretches out from the said side shoulder of said blade; Said cutting straight-tooth is positioned on a pair of position that said side shoulder and said lateral surface intersect; Wherein each said cutting straight-tooth along direction of rotation to front curve, thereby partly form coplanar relation with said cutting edge.
Preferably, said paired parallel opposite face is designed to flat.
Preferably, a plurality of second discontinuous screw thread is limited in the said paired lateral surface of said blade.
Preferably, said a plurality of discontinuous first screw thread and the said a plurality of second discontinuous screw thread have the thread pitch that equates basically.
Preferably; The said a plurality of first discontinuous screw thread of said center point part has first depth of thread; The said a plurality of second discontinuous screw thread of said blade has second depth of thread, and said first depth of thread is greater than said second depth of thread.
Preferably, the said paired lateral surface of said blade is configured to the expanded form away from said handle.
Preferably, the said paired lateral surface of said blade is configured to the form towards said handle convergence.
Preferably, said a plurality of continuous screw thread extends about two revolutions from the said tip of said center point part.
Preferably, said a plurality of discontinuous first screw thread of said center point part stops above the pedestal of said center point part.
Preferably, said center point partly comprise be limited to wherein with isolated at least one chip area of said a plurality of continuous threads.
Preferably, said center point comprises that partly at least one is limited to the chip area in each said opposing flat surfaces, and said at least one chip area begins between said a plurality of continuous threads of said center point part and said pedestal.
Preferably, said cutting edge partly forms along said side shoulder with respect to an axial rake of extending with about 15 degree perpendicular to the plane of the said parallel opposite face of said blade.
Preferably, said cutting edge partly has the cutting edge of bevel.
Description of drawings
Accompanying drawing has shown various embodiment of the present invention and has been used for explaining principle of the present invention together with explanation.In the accompanying drawings:
Figure 1A, 1B and 1C are respectively top view, side view and the edge projection figure of traditional Spade drill bit.
Fig. 2 has shown that traditional shovel shape of Figure 1A-C bores the view that leaves wooden workpiece.
Fig. 3 A, 3B and 3C are respectively top view, side view and the end-views of improved Spade drill bit design.
Fig. 4 has shown that improved shovel shape bores the view that leaves wooden workpiece among Fig. 3 A-C.
Fig. 5 is the view that bores through the shovel shape that has threaded center point after improving among Fig. 3 A-C.
Fig. 6 is the top view according to the Spade drill bit of one embodiment of the present of invention.
Fig. 7 is the threaded top enlarged drawing of the Spade drill bit in the zone 7 of Fig. 6.
Fig. 8 is the threaded top enlarged side view that shows among Fig. 7.
Fig. 9 is the perspective view according to the Spade drill bit of optional embodiment of the present invention.
Figure 10 is the view of brill as shown in Figure 9, that side is parallel substantially.
The view of Figure 11 brill that to be as shown in Figure 9, side assemble towards auger spindle.
Figure 12 is as shown in Figure 9, the side view towards the brill of auger spindle expansion.
The specific embodiment
In detail with reference to the current various preferred embodiments of the present invention, wherein the instance of the preferred embodiments of the present invention shows in the accompanying drawings now.In different patterns, some structure uses similar reference number to come mark.
Referring to Fig. 6, wherein shown one embodiment of the present of invention, the drill bit 202 that wherein shovels the shape formula is included in the axle 204 that drive end 205 stops.Bit 206 forms at the place, opposite end of axle.These parts of drill bit 202 respectively with Figure 1A-C and 3A-C in brill 2 and 102 like similar.In other words, drive end 204 can have the hexagon-shaped configuration that cooperates with drill chuck, and head 206 can have flat shovel shape profile.Head 206 comprises center point 216 and cutting edge 222,224, just as aforesaid two existing drill bits.In addition, the head 206 of the embodiment of the invention can comprise straight-tooth 226 and 228, and is similar with the straight- tooth 26 and 28 of brill shown in Figure 1A-C.
Yet head 206 is inequality with the existing drill bit of Fig. 1-5.For example, in a characteristic of the present invention, center point 216 is threaded, shown in the detailed view that amplifies in Fig. 7 and 8.Especially, center point 216 comprises a series of screw threads 240 that extend along top 216 length (perhaps height) basically.In a preferred embodiment, screw thread 240 almost extends to its pedestal 217 from the tip of center point 216, and boring 202 at least herein is bigger drill bits (being about 7/16 and bigger).For littler brill (being about 3/8 and littler), screw thread preferably stops above the pedestal 217 of center point 216, and most preferably only extends about 4.7625 millimeters (3/16 inches) in the most advanced and sophisticated 218 ' below of center point.For big or less brill, screw thread 240 preferably stopped before the external diameter that arrives head 206.In other words, the height place of screw thread above cutting edge 222,224 stops, and promptly stops at the height place that approximates the straight-tooth 226,228 above the edge greatly.
According to the aspect of this embodiment, center point 216 comprises the relative plane 230 (Fig. 6) that overlaps with the plane 218 of head 206.Screw thread 240 forms edge screw thread 242 along the tapered side of center point then, and is as shown in Figure 7.These screw threads proceed to the tip 218 ' of center point.In this top projection (promptly for the plane in the plane 218 and 230), screw thread 240 comprises the root 244 and tooth top 245 that defines depth of thread d.In this preferred embodiment, be constant with respect to this degree of depth of plane figure of drill bit 206.This constant depth d makes drill bit 206 have sharp initial sword, and this sword only needs minimum pressure for big eurypalynous wood.In specific embodiment, this depth of thread d is approximately 0.127cm (0.05 inch).
The side view of threaded center point 216 has presented another view.Especially because top 216 major part comprises relative plane 230, so top contiguous it tip 218 ' partly be taper.In other words, screw thread 240 comprises the tapered root 246 at the tip 218 ' that adjacent central is top, and is as shown in Figure 8.Root is tapered with angle A, and in a preferred embodiment, the angle of this angle A and the center point taper in its plane figure as shown in Figure 7 is basic identical.In specific embodiment, angle A is according to the size of drill bit 206 and the angle of fixed about 28-45 degree.For the brill of 3.81cm (1.5 inches), angle A is approximately 33 degree.
In this part of center point, preferably the tooth top 247 of screw thread 240 drops on identical tooth top diameter place at the tooth top 245 with screw thread 240 bottoms.Therefore, in the lateral plan of threaded center point 216, screw thread 240 demonstrates the degree of depth of increase towards the tip 218 ' of center point.Screw thread 240 begins at leading edge 248 places, and wherein leading edge impels threaded center point 216 at first to penetrate into workpiece.
The screw thread 240 of center point 216 combines the self-starting characteristic with advancing characteristic automatically.In other words, the leading edge 248 of using screw thread to expose, brill can thrust workpiece at an easy rate.Only on boring, apply minimum thrust through the user, screw thread just continues to thrust and can brill be pulled to workpiece along center point 216.These characteristics of screw thread 240 have reduced the wearing and tearing that center point stands.In addition, the Spade drill bit of acquisition provides a kind of steady boring action that has faster rate than traditional existing drill bit.Boring action stably and feed rate can produce higher-quality hole in workpiece, when particularly workpiece material is wood.
Can be that screw thread 240 provides different pitch according to the application-specific of boring.Generally speaking, the brill that has than fine pitch can pierce workpiece quickly, though and bigger pitch can produce slower bore rate.In specific embodiment, screw thread 240 can have the pitch of 16 screw thread per inch (TPI), and this is especially suitable for softer wood material.On the other hand, the pitch of 26 screw thread per inch (TPI) is more satisfactory for hard timber.The pitch of 20 screw thread per inch (TPI) is most wooden best for what use in building and the structure.This thread pitch is all effective in more soft harder wood, and wherein penetration rate descends when being used for hardwood, and this point is that everybody is total to knowledge.
In existing drill bit, for example in the open PCT application that is numbered WO98/05459 that its disclosure is hereby incorporated by in the disclosed drill bit, center point is only threaded on top side.This screw thread has been represented to the more improvement of the drill bit of morning, because it provides a kind of self-feeding characteristic to brill.Through locating to comprise continuous basically screw thread 247 in center point 216 most advanced and sophisticated 218 ', the present invention has made improvement on this characteristic.When boring when deeper promoting to get into workpiece, these screw threads thrust workpiece continuously, this make on existing drill bit the thrust that must keep reduce.In addition, as stated, compare with the existing meter that is drilled with, the leading edge 248 of the exposure of screw thread 240 allows center point 216 to thrust workpiece at first.
It is the part of chip area 250 that the center point 216 of illustrated embodiment also is included in the form that limits on the relative plane 230 of center point.When central authorities top 216 pierced workpiece, these chip areas 250 improved the situation of removing of the smear metal of center point 216 generations.As best image goes out among Fig. 7, this chip area 250 be close to continuous thread 247 lower ends below beginning, and continue to get into the plane 218 of the head 206 that is close to cutting edge 222,224 belows.Top initial during with the workpiece engagement when central authorities, the shorter scope that continuous screw thread makes chip material pass through continuous thread 247 is upwards sent.Along with center point is further thrust workpiece, chip volume increases.If there is not chip area 250, the chip volume of increase tends to block the initial bore hole that forms of center point, thereby increases required thrust, has improved the heat accumulation in the bore hole and has reduced life-span of threaded core 216.Therefore, chip area 250 discharges the boring of chip material as soon as possible, still keeps the useful characteristic of continuous thread 247 simultaneously.
In the embodiment of Fig. 6, drill bit 202 comprises smooth side 220.In optional embodiment of the present invention as shown in Figure 9, drill bit 202 ' the be included in screw thread 260 of relative side 220 ' middle qualification.As shown in Figure 9, drill bit 202 ' can comprise and brill as shown in Figure 6 202 similar characteristics.Yet, seen like Fig. 9, the side comprise a series of basically along the side 220 ' the groove 260 of gamut.These grooves 260 can form in the machined into that is used for cutting thread.Therefore, head 206 ' opposed side edges 220 ' on groove 260 constitute basically extend head 206 ' a plurality of sections of screw of length.
These external screw threads 260 occur at screw thread 240 stopping places of center point 216.In other words, in case straight-tooth 226,228 contact workpieces, head 206 ' screw thread 260 just with workpiece material engagement and impel and drill into workpiece.When cutting edge 222,224 beginning scraping workpiece materials, screw thread 260 continues to draw into workpiece.
When straight-tooth 226,228 arrives the end of workpiece bore, just realized the benefit that external screw thread 260 is provided.As illustrated during the PCT that is numbered WO98/05459 that discusses in the above announces, the problem that the straight-tooth on the Spade drill bit exists is that straight-tooth tends to pull in the cut end vicinity.Have been found that to bit head 206 ' side 220 ' augment screw thread 260 help to make drill bit to pass advancing of material held stationary, even when boring when breaking through the workpiece opposed side edges.
The scope of continuous thread can be used and difference according to specific drill bit.In most of preferred embodiments, for the drill bit (it is thick promptly to be approximately 0.2032cm (0.080 inch)) of standard thickness, continuous thread 240 approximately extends two revolutions.The scope of continuous thread 247 also can be decided according to the length (perhaps height) of center point.In typical shovel shape bored, center point 216 reached the about 1.27cm in cutting edge 222,224 tops (0.50 inch) of head 206.In this typical situation, continuous thread 247 approximately extends 0.254cm (0.10 inch) from most advanced and sophisticated 218 '.
In a preferred embodiment, drill bit 202 ' side 220 ' substantially parallel, shown in figure 10.Yet the side that can estimate to have screw thread 260 can be according to selectable towards arranging, shown in Figure 11 and 12.Especially, as shown in Figure 11, side 220 " can be assembled towards auger spindle 204 with angle M-.This convergence can begin at the straight-tooth place or begin at cutting edge 222,224 downstream parts.
Perhaps the side 220 " ' can expand towards auger spindle 204, shown in figure 12.Therefore, the side 220 " ' can be with angle M
+Expansion.(should be appreciated that, screw thread 260 also side 220 " with 220 " ' on).Preferred convergence and expansion angle are all on the magnitude of about 1 degree.When drill bit deeper advances in the workpiece, the side 220 of expansion " ' so that drill bit is stable.On the other hand, the side 220 of convergence " can reduce to be used for rotary drilling-head and thrust the required power of workpiece.When the screw thread of the expansion that increases when diameter is widened bore hole gradually, threaded expansion side 220 " ' also can produce penetrate workpiece smooth perhaps " " the bore hole of cleaning.Parallel side 220 ', the side 220 " or side 220 of expansion " assembled ' the driving torque of the selection brill that can mesh according to the character of workpiece material and drill bit decide.For example, when brill is electric portable drill, hope driving force and drilling time are reduced to minimum, so the convergence of preferred Figure 11 brill.On the other hand, when obtaining stronger brill, just hope to use the expansion drill bit of Figure 12.
Drill bit in the illustrated embodiment can for example form being numbered in the process of describing in 5,433,561 the United States Patent (USP) according to known procedures, and wherein this patent is incorporated herein by reference.External screw thread 260 on the side 220 of drill head 206 preferably is used to produce the lathe formation of screw.The screw thread 240 preferred tapered thread blanking dies that use on the center point form.Should be appreciated that tapered die can not cut out screw thread in the plane 230 of center point, because these surfaces are positioned at the tapered diameter below of center point.On the other hand, contiguous most advanced and sophisticated 218 ' partly keeps its taper shape to dispose in the center point, because the tapered diameter of this part is less than the thickness of bit head 206.
Showing and choosing these embodiment is for principle of the present invention and application thereof are described best; Thereby make others skilled in the art in various embodiment, can use the present invention best and carry out various improvement, wherein these improvement are applicable to the special-purpose of expection.Scope of the present invention is intended to limit through the claim of enclosing.
For example, external screw thread 260 can use separately, combine with the screw thread 240 of center point or not use, and this requirement according to drill bit is decided.In less brill, preferably only use threaded center point, and on the side of bit head, do not have screw thread.Yet according to the present invention, constant in the embodiment of expection a bit is to have located to provide continuous screw thread at the tip 218 ' of center point, and this continuous screw thread partly locates to become gradually discontinuous screw thread on the plane of center point.
The embodiment that shows is best suited for the boring that penetrates wood material.The scope of wood material to harder material, and has been carried out suitable change to different sizes from softer material as stated.Can expect that these brills can be applied to drill other material that has similarity with wood material.
Claims (17)
1. drill bit comprises:
The drive end part;
Be connected to the handle of said drive end part;
Be connected to the blade of said handle, said blade has the opposite face of pair of parallel, and said opposite face is coupled together by a pair of lateral surface that is parallel to said handle usually;
A pair of side shoulder, thus extend internally and partly assemble the front end that forms said blade in center point from said lateral surface;
Along the cutting edge part that the front end of said blade forges, the part of wherein said blade along direction of rotation to front curve, and wherein each said side shoulder from said each lateral surface to said center point part to front curve,
Wherein, said center point partly has a plurality of discontinuous first screw thread and a plurality of continuous screw thread that is limited to wherein, wherein:
Said center point partly comprises tip and pedestal,
Said a plurality of continuous screw thread is positioned near the said tip of said center point part, and
Said a plurality of discontinuous first screw thread inserts between said a plurality of continuous screw threads and the said center point said pedestal partly,
Said paired parallel opposite face is designed to flat,
A plurality of discontinuous second screw threads are limited in the said paired lateral surface of said blade.
2. drill bit as claimed in claim 1 is characterized in that, said a plurality of continuous screw threads comprise tapered root.
3. drill bit as claimed in claim 1 is characterized in that, said center point partly comprises the relative plane with said a plurality of discontinuous first screw thread adjacency.
4. drill bit as claimed in claim 3 is characterized in that, said center point partly comprises the relative lateral margin that inserts between the said relative plane, and said a plurality of discontinuous first screw thread is limited in the said relative lateral margin.
5. drill bit as claimed in claim 4 is characterized in that, first degree of depth of said a plurality of discontinuous first screw threads is constant.
6. drill bit as claimed in claim 5 is characterized in that:
Second degree of depth of the part of said a plurality of continuous threads is constant, and
Said first degree of depth equals said second degree of depth.
7. drill bit as claimed in claim 1; It is characterized in that; Said blade has a pair of cutting straight-tooth that upwards stretches out from the said side shoulder of said blade; Said cutting straight-tooth is positioned on a pair of position that said side shoulder and said lateral surface intersect, wherein each said cutting straight-tooth along direction of rotation to front curve, thereby partly form coplanar relation with said cutting edge.
8. brill as claimed in claim 1 is characterized in that, said a plurality of discontinuous first screw threads and said a plurality of discontinuous second screw thread have the thread pitch that equates basically.
9. drill bit as claimed in claim 1 is characterized in that:
Said a plurality of discontinuous first screw thread of said center point part has first depth of thread,
Said a plurality of discontinuous second screw thread of said blade has second depth of thread, and
Said first depth of thread is greater than said second depth of thread.
10. drill bit as claimed in claim 1 is characterized in that, the said paired lateral surface of said blade is configured to the expanded form away from said handle.
11. drill bit as claimed in claim 1 is characterized in that, the said paired lateral surface of said blade is configured to the form towards said handle convergence.
12. drill bit as claimed in claim 1 is characterized in that, said a plurality of continuous screw threads extend about two revolutions from the said tip of said center point part.
13. drill bit as claimed in claim 1 is characterized in that, said a plurality of discontinuous first screw thread of said center point part stops above the pedestal of said center point part.
14. drill bit as claimed in claim 1 is characterized in that, said center point partly comprise be limited to wherein with isolated at least one chip area of said a plurality of continuous threads.
15. drill bit as claimed in claim 3 is characterized in that:
Said center point partly is included at least one chip area that limits at least one said relative plane, and
Said at least one chip area begins between said a plurality of continuous threads of said center point part and said pedestal.
16. drill bit as claimed in claim 1 is characterized in that, said cutting edge partly forms along said side shoulder with respect to an axial rake of extending with about 15 degree perpendicular to the plane of the said parallel opposite face of said blade.
17. brill as claimed in claim 1 is characterized in that, said cutting edge partly has the cutting edge of bevel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2003/007184 WO2004080632A1 (en) | 2003-03-11 | 2003-03-11 | Spade drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1758977A CN1758977A (en) | 2006-04-12 |
| CN1758977B true CN1758977B (en) | 2012-12-05 |
Family
ID=32986329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03826138.3A Expired - Lifetime CN1758977B (en) | 2003-03-11 | 2003-03-11 | Spade drill bit |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1606073B1 (en) |
| CN (1) | CN1758977B (en) |
| AU (1) | AU2003225722A1 (en) |
| WO (1) | WO2004080632A1 (en) |
Families Citing this family (11)
| 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 |
| GB2431368B (en) * | 2005-10-20 | 2010-03-03 | Irwin Ind Tool Co | Spade bit |
| US7473056B2 (en) | 2005-10-20 | 2009-01-06 | Irwin Industrial Tool Company | 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 (en) * | 2007-08-10 | 2009-02-19 | Qi Zhang | Flat drill for drilling through wood material |
| US7887269B2 (en) | 2007-10-10 | 2011-02-15 | Robert Bosch Gmbh | Spade bit with improved cutting geometry |
| US8366357B2 (en) | 2007-10-10 | 2013-02-05 | Robert Bosch Gmbh | Spade bit having reamer feature |
| US8262325B2 (en) | 2007-10-10 | 2012-09-11 | Robert Bosch Gmbh | Spade bit having threaded conical tip portion |
| WO2015109485A1 (en) * | 2014-01-23 | 2015-07-30 | 杭州巨星工具有限公司 | Flat drill bit |
| USD863384S1 (en) * | 2018-04-30 | 2019-10-15 | Disston Company | Spade drill bit |
Citations (5)
| 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 |
| US5221166A (en) * | 1991-07-31 | 1993-06-22 | Enderes Tool Co., Inc. | Spade-type drill bit apparatus and method |
| US5433561A (en) * | 1992-05-20 | 1995-07-18 | Vermont American Corporation | Wood bit and method of making |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998005459A1 (en) * | 1996-08-08 | 1998-02-12 | Vermont American Corporation | Spade bit |
| DE10007736A1 (en) * | 2000-02-02 | 2001-08-16 | Giebmanns Karl Heinz | Wood drill |
-
2003
- 2003-03-11 EP EP03816276A patent/EP1606073B1/en not_active Expired - Lifetime
- 2003-03-11 WO PCT/US2003/007184 patent/WO2004080632A1/en not_active Application Discontinuation
- 2003-03-11 CN CN03826138.3A patent/CN1758977B/en not_active Expired - Lifetime
- 2003-03-11 AU AU2003225722A patent/AU2003225722A1/en not_active Abandoned
Patent Citations (5)
| 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 |
| US5221166A (en) * | 1991-07-31 | 1993-06-22 | Enderes Tool Co., Inc. | Spade-type drill bit apparatus and method |
| US5433561A (en) * | 1992-05-20 | 1995-07-18 | Vermont American Corporation | Wood bit and method of making |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1606073B1 (en) | 2012-11-21 |
| AU2003225722A1 (en) | 2004-09-30 |
| WO2004080632A1 (en) | 2004-09-23 |
| EP1606073A4 (en) | 2011-04-20 |
| CN1758977A (en) | 2006-04-12 |
| EP1606073A1 (en) | 2005-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121205 |
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| CX01 | Expiry of patent term |