DK151590B - milled; SELF-ESTABLISHMENT PROTECTION AGENCY; WHO HAS A DRILL. - Google Patents
milled; SELF-ESTABLISHMENT PROTECTION AGENCY; WHO HAS A DRILL. Download PDFInfo
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- DK151590B DK151590B DK502480AA DK502480A DK151590B DK 151590 B DK151590 B DK 151590B DK 502480A A DK502480A A DK 502480AA DK 502480 A DK502480 A DK 502480A DK 151590 B DK151590 B DK 151590B
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- Prior art keywords
- fastener
- axis
- groove
- grooves
- drill
- Prior art date
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- 238000005520 cutting process Methods 0.000 claims description 38
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 description 7
- 238000005553 drilling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
- F16B25/103—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a drilling screw-point, i.e. with a cutting and material removing action
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/12—Cutters specially designed for producing particular profiles
- B23C5/14—Cutters specially designed for producing particular profiles essentially comprising curves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0084—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by geometric details of the tip
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Drilling Tools (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Milling Processes (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Forging (AREA)
- Dental Preparations (AREA)
- Dowels (AREA)
Description
i 151590in 151590
Opfindelsen angår et fræset, selvskærende fastgørelsesorgan, som har en boreende ved den ene ende af fastgørelsesorganets skaft, hvilken boreende omfatter et par spor, der strækker sig ved ens modsatte vinkler i forhold til fastgørelsesorganets 5 akse, idet de ligger på i hovedsagen hver sin side af denne, samt et par hældele, som strækker sig imellem sporene, hvilke hældele skærer hinanden til dannelse af en smal mejselspids og er tildannet med voksende tværsnit, set i planer parallelt med fastgørelsesorganets akse og med voksende afstand fra aksen, 10 idet hvert af sporene danner en skærende kant og en slæbeflade, og hvert spor har en bueformet del, som i det mindste omfatter slæbefladen og har en i hovedsagen ensartet krumningsradius, set i et plan vinkelret på sporets akse, og hvor hvert spor ud over den bueformede del har en plan fladedel, som 15 strækker sig indad fra skaftets yderside og skærer i det mindste en del af skærekanten.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a milled, self-tapping fastener having a bore end at one end of the shaft of the fastener, comprising a pair of grooves extending at equal opposite angles to the axis of the fastener 5, substantially on each side thereof. thereof, as well as a pair of pouring parts extending between the grooves, which cutting parts intersect to form a narrow chisel tip and formed with growing cross-section, seen in planes parallel to the axis of the fastener and with increasing distance from the axis, each of the grooves forming a cutting edge and a towing surface, and each groove has a curved portion which at least comprises the towing surface and has a substantially uniform radius of curvature, seen in a plane perpendicular to the axis of the groove, and each groove beyond the curved portion has a a flat face portion which extends inward from the outside of the shaft and cuts at least a portion of the cutting edge.
Indtil i dag er der blevet udviklet mange forskellige boreskrueformer. Konstruktionen af disse boreskruer har været nog-2Q et nær en eksakt videnskab med årsagerne til, hvorfor nogle af boreskruerne virker udmærket i nogle materialer, men ikke i andre, og hvorfor andre boreskruer overhovedet ikke virker, forblivende noget nær et mysterium. F.eks. er det kendt til nogle anvendelser, at en enkel sømspids er tilstrækkelig til 2g at gennemtrænge nogle materialer, f.eks. tørre vægge, når den drejes ved en tilstrækkelig stor hastighed. På den anden side kan ingen endnu fremstillet boreskrue på tilfredsstillende måde bore igennem nogle af lavlegeringsstålmaterialerne med høj styrke.To date, many different drill screw forms have been developed. The design of these drill screws has been close to an exact science with the reasons why some of the drill screws work well in some materials but not in others, and why other drill screws do not work at all, remaining somewhat near a mystery. Eg. it is known for some applications that a simple nail tip is sufficient for 2g to penetrate some materials, e.g. dry walls when turned at a sufficiently high speed. On the other hand, no yet manufactured drill screw can satisfactorily drill through some of the high strength low alloy steel materials.
3030
To af de fundamentale kriterier, der anvendes til at bedømme boreskruers ydeevne er·. 1) størrelsen af den endetrykbelast-ning, der kræves for, at skruen kan bore og 2) den tid i sekunder, som skruen anvender til at gennemtrænge det specielle materiale, der bores i. Under samlebåndsagtige forhold, hvor 35 der skal monteres et stort antal af fastgørelsesorganer af en arbejder inden for én time, vil en reduktion af både størrelsen af den krævede endetrykbelastning og boretiden være en fordel for både den enkelte arbejder og dennes arbejdsgiver.Two of the fundamental criteria used to judge the performance of drill screws are ·. 1) the amount of end pressure load required for the screw to drill and 2) the time in seconds that the screw uses to penetrate the special material being drilled. Under assembly-like conditions, where a large one is to be fitted number of fasteners of a worker within one hour, a reduction in both the size of the required end pressure load and the drilling time will be advantageous to both the individual worker and his employer.
2 1515902 151590
Fra US-patentskrift nr. 1.294.268 kendes et skrue 1ignende fastgørelsesorgan, som er forsynet med to spiralformede spor, som skærer igennem fastgørelsesorganets gevind. Disse spor er sammensat af en bueformet flade og en plan flade.US Patent No. 1,294,268 discloses a screw-like fastener provided with two helical grooves which cut through the threads of the fastener. These tracks are composed of a curved surface and a flat surface.
55
Fastgørelsesorganet ifølge den foreliggende opfindelse er ejendommeligt ved, at hældelene har stort set ingen krumning i retning parallelt med mejselspidsen, men en konveks krumning vinkelret på mejselspidsen.The fastener according to the present invention is characterized in that the pouring parts have virtually no curvature in the direction parallel to the chisel tip, but a convex curvature perpendicular to the chisel tip.
10 Herved opnås, at der tilvejebringes et fastgørelsesorgan, som udviser en forholdsvis hurtigt virkende og mere ensartet virkende boreevne. Dette skyldes især, at fastgørelsesorganet har en forholdsvis kraftig spids med hældele, som i kombination med den specielle form for spor har vist sig at muliggøre en bedre strømning af afskåret materiale.Hereby it is obtained that a fastener is provided which exhibits a relatively fast and more uniform drilling ability. This is mainly due to the fact that the fastener has a relatively strong tip with pouring parts which, in combination with the special form of groove, has been shown to enable a better flow of cut material.
Opfindelsen forklares nedenfor under henvisning til tegningen, hvor 20 fig. 1 viser en selvborende, selvskærende skrue ifølge opfindelsen set fra siden, fig. 2 en udførelsesform for en boreskrue ifølge opfindelsen set fra enden langs linien 2-2 i fig. 1, 25 fig. 3 den i fig. 2 viste borespids set i større målforhold, fig. 4 borespidsen set fra siden i retning vinkelret på mejslen eller langs linien 4-4 i fig. 3, 30 fig. 5 en afbildning set fra siden parallelt med den skærende kant eller langs linien 5-5 i fig. 3, fig. 6 en afbildning set fra siden efter linien 6-6 i fig. 3, 35 dvs. en linie parallelt med mejslen, fig. 7 en afbildning set fra siden efter linien 7-7 i fig. 3, 3 151590 fig. 8 et snit efter linien 8-8 i fig. 7, dvs. en linie der er vinkelret på den ene af sporenes akse, 5 fig. 9 en lidt anden udførelsesform for opfindelsen, hvori de skærende kanter ligger på den anden side af midten (dvs. begge strækker sig på den anden side af samme diametrale plan), set fra enden, fig. 10 en anden udførelsesform for opfindelsen, hvori de skærende kanter er i hovedsagen koaksiale (dvs. på midten), fig. 11 en fjerde udførelsesform for opfindelsen, som har et spånbrydende træk, ligeledes set fra enden, 15 fig. 12 den i fig. 11 viste udførelsesform set fra siden efter linien 12-12, fig. 13 et snit efter linien 13-13 i fig. 12, og som viser 20 den riffelskæreindretning, hvormed den pågældende udførelsesform fremstilles, fig. 14A et råemne uden spor, men med en 90°1 s spidsvinkel, 25 fig. 14B en standardspidsvinkel på 105°i»set frå siden, fig. 14C en udførelsesform for en i hovedsagen konveks spids samt den form for skæreindretning, der anvendes til at frem-^ stille denne, set fra siden, og fig. 14D en afbildning set fra siden af en anden udførelsesform for en i hovedsagen konveks spids, hvis sider hver er tildannet af et par vinkeldannende flader, og hvilken afbild-^ ning viser tandformen på den skæreindretning, der anvendes til fremstilling af denne spids.The invention is explained below with reference to the drawing, in which: FIG. 1 is a side view of a self-drilling, self-tapping screw according to the invention; FIG. 2 shows an embodiment of a drill screw according to the invention seen from the end along the line 2-2 in FIG. 1, FIG. 3 shows the one shown in FIG. 2 in larger target conditions, FIG. 4 is a side view of the drill bit in the direction perpendicular to the chisel or along line 4-4 of FIG. 3, 30 FIG. 5 is a side view parallel to the cutting edge or along line 5-5 of FIG. 3, FIG. 6 is a side view along line 6-6 of FIG. 3, 35 ie. a line parallel to the chisel; 7 is a side view along line 7-7 of FIG. 3, 3 FIG. 8 is a sectional view taken along line 8-8 of FIG. 7, i.e. a line perpendicular to one of the axis of the grooves; 9 is a slightly different embodiment of the invention in which the intersecting edges lie on the other side of the center (i.e., both extend on the other side of the same diametrical plane), seen from the end; FIG. Fig. 10 shows another embodiment of the invention in which the cutting edges are substantially coaxial (i.e. in the middle); 11 shows a fourth embodiment of the invention having a chip-breaking feature, also seen from the end; FIG. 12 is the one shown in FIG. 11 is a side view taken along line 12-12; FIG. 13 is a sectional view taken along line 13-13 of FIG. 12, showing the rifle cutting device by which the embodiment in question is made; Fig. 14A shows a blank without groove but with a 90 ° 1 s tip angle; Fig. 14B shows a standard tip angle of 105 ° in side view; 14C is a side view of an embodiment of a generally convex tip as well as the form of cutting device used to make it, and FIG. 14D is a side view of another embodiment of a generally convex tip, the sides of which are each formed by a pair of angular surfaces, and which image shows the tooth shape of the cutting device used to make this tip.
4 151S904 151S90
Det selvborende, selvskærende fastgørelsesorgan ifølge opfindelsen er vist ved det generelle henvisningstal 10. Fig. 1-8 viser flere afbildninger af den foretrukne udførelsesform hvorved den nøjagtige form af boreenden fremgår tydeligt. Det selv-5 skærende gevind 14 kan have en hvilken so helst passende form.The self-tapping, self-tapping fastener of the invention is shown by the general reference numeral 10. FIG. 1-8 show several views of the preferred embodiment whereby the exact shape of the drill end is clearly indicated. The self-cutting thread 14 may be of any suitable shape.
Boreenden 12 ifølge opfindelsen er tildannet ved brug af afrundede skæreindretninger til både rifling og spidsning i stedet for konventionelle save, hvoraf nogle til dels.er kendt fra 10 USA patentskrift 3.933.075. Riffelskæreindretningerne (ikke vist) placeres på begge sider af skrueråemnet med deres længdeakser. placeret ved ens modsatte vinkler (generalt i størrelsesordenen 15°) i forhold til råemnets akse. I modsætning til den teknik, der er beskrevet i USA patentskrift nr. 3.933.075, 15 hvor skæreindretningerne stikkes ind i råemnet med deres akser strækkende sig radialt i forhold hertil, føres skæreindretningerne med henblik på dannelse af et ensartet afrundet spor under fremstillingen af sporene 16 og 18 i skruen 10 ifølge opfindelsen således ind i råemnet, at deres sidekanter 20 bibringer hver af sporene en lige dél 20 og 22 (se fig. 8). Hvert spor har således en sammensat form som omfatter en lige del 20, 22 og en afrundet del 24, 26. I den foretrukne udførelsesform omfatter de lige dele 20, 22 skærekanter 28 og 30, medens de afrundede dele 24 og 26 danner 25 bag- eller slæbeflader 32 og 34. Skæreindretningernes midterlinier ligger over enden af råemnet, så at den tyndeste del af kroppen vil være tilbage ved spidsen.The drill end 12 of the invention is formed by using rounded cutting devices for both rifling and pointing instead of conventional saws, some of which are known in part from US Patent 3,933,075. The rifle cutting devices (not shown) are placed on both sides of the screw blank with their longitudinal axes. positioned at equal opposite angles (generally on the order of 15 °) relative to the axis of the blank. Contrary to the technique described in U.S. Patent No. 3,933,075, wherein the cutting devices are inserted into the blank with their axes extending radially relative thereto, the cutting devices are formed to form a uniformly rounded groove during the manufacture of the grooves. 16 and 18 of the screw 10 according to the invention into the blank so that their lateral edges 20 impart to each of the grooves an equal portion 20 and 22 (see Fig. 8). Thus, each groove has a composite shape comprising a straight portion 20, 22 and a rounded portion 24, 26. In the preferred embodiment, the straight portions 20, 22 comprise cutting edges 28 and 30, while the rounded portions 24 and 26 form 25 rear ends. or tow surfaces 32 and 34. The center lines of the cutting devices are above the end of the blank so that the thinnest part of the body will be left at the tip.
På det sted, hvor hældele 38 og 40 skærer hinanden dannes en 30 mejsel 36. Mejslen 36 danner en spids·vinkel med hver af de skærende kanter 28 og 30 på i størrelsesordenen 30°. Formen af de skærende kanter 28 og 30 og slæbefladerne 32 og 34, således som disse ses i fig. 2 og 3 7er nødvendigvis summatio-nen af virkningerne af sporene 16 og 18 og planeringen af 35 hældelene 38 og 40.At the point where pouring parts 38 and 40 intersect, a chisel 36 is formed. The chisel 36 forms an acute angle with each of the cutting edges 28 and 30 of the order of 30 °. The shape of the cutting edges 28 and 30 and the drag surfaces 32 and 34 as seen in FIG. 2 and 37 are necessarily the summation of the effects of the grooves 16 and 18 and the leveling of the 35 slopes 38 and 40.
5 1515905 151590
For at vise den aktuelle form af sporet uden tilstedeværelsen af virkningerne af spidsen, er der i fig. 8 vist en afbildning af et tværsnit efter linien 8-8 i fig. 7, dvs. en linie der er vinkelret på sporets 16 akse. Den plane flade 20 er forbi g eller under den radiale midterlinie (herefter "under midten"), som er parallel med de to skærende kanter 28 og 30. Dette skyldes hældningen af sporene 16 og 18 i forhold til skruens længdeakse. Den afrundede del 24 har en ensartet krumningsradius i dette plan svarende til krumningsradien på den skære-indretning, som blev anvendt til fremstillingen. Linien 8-8 er naturligvis ikke vinkelret på sporets akse, men hælder snarere 30° i forhold hertil. Fig. 8 tjener som en dramatisk indikation af den virkning aflejringen af spidsen kan have på fastgørelsesorganets endebillede.In order to show the current shape of the track without the presence of the effects of the tip, FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 7, i.e. a line perpendicular to the axis of the groove 16. The flat surface 20 is past g or below the radial center line (hereinafter "below the center") which is parallel to the two cutting edges 28 and 30. This is due to the inclination of the grooves 16 and 18 relative to the longitudinal axis of the screw. The rounded portion 24 has a uniform radius of curvature in this plane corresponding to the radius of curvature of the cutting device used in the manufacture. The line 8-8 is, of course, not perpendicular to the axis of the track, but rather inclines 30 ° to it. FIG. 8 serves as a dramatic indication of the effect the tip deposition can have on the end image of the fastener.
1515
Et andet trask ved sporformen er vist i fig. 6. Skæringen af de vinkelstillede skæreindretninger med skaftets cylindriske periferi resulterer i, at sporene 16 og 18 får bueformede forkanter 42 og 44. Dette i forbindelse med skæreindretningens 20 cirkulære form, frembringer en øselignende form i nærheden af skærekanterne 28 og 30. Denne øseform kan resultere i, at fastgørelsesorganet trækker sig selv ind i det borede hul, hvilket i det mindste delvis kan være forklaringen på dette fastgørelsesorgans gode boreegenskaber.Another feature of the groove shape is shown in FIG. 6. The cutting of the angular cutting devices with the cylindrical periphery of the shaft results in the grooves 16 and 18 having arcuate leading edges 42 and 44. This, in conjunction with the circular shape of the cutting device 20, produces a shaft-like shape in the vicinity of the cutting edges 28 and 30. result in the fastener pulling itself into the drilled hole, which may at least partly be the explanation for the good drilling properties of this fastener.
2525
Selv om den foretrukne udførelsesform for opfindelsen er en form, hvori de skærende kanter er over midten, kan der naturligvis også fremstilles både en under midten og en på midten værende tilstand ved at reducere skæreindretningernes ind-30 trængningsdybde og bevæge skæreindretningerne sideværts. Dis se forskellige udførelsesformer er vist i fig. 9 henholdsvis 10. I disse udførelsesformer omfatter de bueformede dele 32 og 34 af sporene en del af de skærende kanter 28 og 30, hvorved disse får en sammensat form, I disse alternative udførel-35 sesformer er det vigtigt at opretholde en kort mejsellængde for at sikre,' at der kræves lavere endetryk til at igangsætte boringen.Of course, although the preferred embodiment of the invention is a shape in which the cutting edges are above the middle, both a below-center and a middle-state can also be produced by reducing the penetration depth of the cutting devices and moving the cutting devices laterally. Dis see different embodiments are shown in FIG. 9 and 10. In these embodiments, the arcuate portions 32 and 34 of the grooves comprise a portion of the cutting edges 28 and 30 thereby providing a composite shape. In these alternative embodiments, it is important to maintain a short chisel length to ensure that lower end pressure is required to initiate drilling.
6 1515906 151590
Fig. 11-13 viser endnu et aspekt ved den foreliggende opfindelse. Hidtil har der kun været tilføjet spånbrydende trade til boreskruer med smedet spids. Ved den foreliggende opfin-5 delse, strækker der sig mindre dybe render 46 og 48 sig på langs i hvert fræset spor 16 og 18. Dette spånbrydende træk er fræset ved hjælp af en skæreindretning 50 (fig. 13). Denne skæreindretning 50 har flere tænder 52 (der anvendes fortrinsvis en skæreindretning med 20 eller 32 tasnder). Hver tand 52 I® har et profil, der omfatter en ensartet første afrundet del 54 og en bueformet ribbe 56 med en anden kortere krumningsradius. Denne ribbe 56 kan være forsat fra den aksiale midterlinie i den ene eller den anden retning afhængig af den ønskede sporform. Selv om der kun er vist formen over midten kan 1^ naturligvis den spånbrydende rende også tilknyttes de under midten eller på midten værende tilstande, der er afbildet i fig. 9 og 10. Endvidere kan skæreindretningens form ændres således, at ribberne bevæges tværs henover overfladen af den afrundede tand, så at rendens placering ændres inden for spo- 20 ret, så at spånbryderen placeres på den ene eller den anden side af mejslen.FIG. 11-13 illustrate yet another aspect of the present invention. So far, only chip-breaking trade has been added to forged-head drill screws. In the present invention, smaller deep grooves 46 and 48 extend longitudinally in each milled groove 16 and 18. This chip breaking feature is milled by a cutting device 50 (Fig. 13). This cutting device 50 has several teeth 52 (preferably a cutting device having 20 or 32 teeth) is used. Each tooth 52 I® has a profile comprising a uniform first rounded portion 54 and an arcuate rib 56 having a second shorter radius of curvature. This rib 56 may be offset from the axial center line in one direction or another depending on the desired groove shape. Of course, even though the shape is shown above the middle, the chip breaking channel can of course also be associated with the below or middle states depicted in FIG. 9 and 10. Furthermore, the shape of the cutting device can be changed such that the ribs move across the surface of the rounded tooth so that the position of the groove changes within the groove so that the chip breaker is placed on one or the other side of the chisel.
Som tidligere nævnt, vil endebilledet af boreskruen 10 (som er vist i fig. 3, 9 og 10) og skruens ydeevne variere i afhængighed af den specielle spids, der bibringes råemnet. Således kan det være at en spids vil overgå en anden i et første materiale, men ikke i et andet materiale. Foreløbige forsøg viser imidlertid, at den generelle konvekse spids, der er af-bildet i den foretrukne udførelsesform og vist i fig. 14C, konsekvent overgår andre spidsformer, når den kombineres med den tidligere omtalte sporform. Til fremstillingen af denne generelle konvekse spids. anvendes der en første skæreindret- 35 7 151590 ningen (ikke vist), som har en konkav tand til at fjerne en i hovedsagen triangulær del af råemnet efterfulgt af riflingen med henblik på at danne hælområdet 40, og derpå anvendes der en anden skæreindretning 58 med konkave tænder 60 til at danne 5 en hældel 38 og mejslen 36.As previously mentioned, the end view of the drill screw 10 (shown in Figures 3, 9 and 10) and the performance of the screw will vary depending on the particular tip provided with the blank. Thus, it may be that a tip will outperform another in a first material, but not in a second material. However, preliminary tests show that the general convex tip depicted in the preferred embodiment shown in FIG. 14C, consistently outperforms other tip shapes when combined with the previously mentioned track shape. For the manufacture of this general convex tip. a first cutting device (not shown) having a concave tooth is used to remove a substantially triangular portion of the blank followed by the groove to form the heel region 40, and then a second cutting device 58 with concave teeth 60 to form a pitch 38 and the chisel 36.
En anden i hovedsagen konveks spidsform er vist i fig. 14D.Another generally convex tip shape is shown in FIG. 14D.
I denne udførelsesform for opfindelsen, er hældelene hver dannet af et par plane flader 62 og 64, som tilsammen danner en stump vinkel. Den i hovedsagen konvekse spids i denne udførel-10 sesform er også her tildannet ved hjælp af et par skæreindretninger 66 (hvoraf der er vist en), og som har tænder 68, der har en periferi, der er tildannet af to vinkeldannende dele 70 og 72. Disse vinkeldannende dele afgrænser en stump vinkel 0, som er i hovedsgen lig med den vinkel, der skal dannes 15 på boreskruen. Begge disse stumpe vinkler er fortrinsvis lig med 172 1/2° (målt indvendigt på boreskruen og udvendigt på skæreindretningen). På denne måde, vil spidsen, der dannes af fladerne 62 danne en vinkel, som er 15° større end den, der dannes af de plane flader 64, nemlig f.eks. 105° i forhold til 20 90°. Der kan naturligvis også anvendes enkle vinkelformede spidser såsom spidser på 90° (fig. 14A) og 105° (fig. 14B) på skruen, og disse spidser kan under visse omstændigheder vise sig at være fordelagtige.In this embodiment of the invention, the pouring portions are each formed by a pair of planar faces 62 and 64 which together form a blunt angle. The generally convex tip in this embodiment is also formed here by a pair of cutting devices 66 (one of which is shown) and having teeth 68 having a periphery formed by two angular forming parts 70 and 72. These angular parts define a blunt angle 0 which is generally equal to the angle to be formed 15 on the drill screw. Both of these blunt angles are preferably equal to 172 1/2 ° (measured internally on the drill screw and externally of the cutting device). In this way, the tip formed by the faces 62 will form an angle 15 ° greater than that formed by the planar faces 64, e.g. 105 ° to 20 90 °. Of course, simple angular tips such as 90 ° (Fig. 14A) and 105 ° (Fig. 14B) tips can also be used on the screw, and these tips may prove advantageous in certain circumstances.
Der kan foretages mange ændringer uden, at man herved afviger 25 fra opfindelsens ide. F.eks. kan den generelle konvekse spids, der er vist i fig. 140 få en mindre eller større vinkel ved at forskyde skæreindretningens 58 akse i forhold til råemnets akse. Med hensyn til borespidsen ifølge opfindelsen, er det endvidere tænkeligt, at den viste form kan fremstilles ved smed-30 ning.Many changes can be made without departing from the idea of the invention. Eg. For example, the general convex tip shown in FIG. 140 to obtain a smaller or larger angle by displacing the axis of the cutting device 58 relative to the axis of the blank. In addition, with respect to the drill tip of the invention, it is conceivable that the mold shown can be made by forging.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9746079A | 1979-11-26 | 1979-11-26 | |
| US9746079 | 1979-11-26 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK502480A DK502480A (en) | 1981-05-27 |
| DK151590B true DK151590B (en) | 1987-12-14 |
| DK151590C DK151590C (en) | 1988-05-30 |
Family
ID=22263470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK502480A DK151590C (en) | 1979-11-26 | 1980-11-26 | FRAESET, SELF-RETURNING PROPERTY BODY, WHICH HAS A DRILL |
Country Status (24)
| Country | Link |
|---|---|
| JP (1) | JPS5686217A (en) |
| AR (1) | AR224552A1 (en) |
| AT (1) | AT380733B (en) |
| AU (1) | AU539311B2 (en) |
| BE (1) | BE886331A (en) |
| BR (1) | BR8007606A (en) |
| CA (1) | CA1175688A (en) |
| CH (1) | CH640318A5 (en) |
| DE (1) | DE3044001A1 (en) |
| DK (1) | DK151590C (en) |
| ES (1) | ES263215Y (en) |
| FI (1) | FI77094C (en) |
| FR (1) | FR2470281B1 (en) |
| GB (3) | GB2063731B (en) |
| IE (1) | IE51184B1 (en) |
| IT (1) | IT1134443B (en) |
| LU (1) | LU82954A1 (en) |
| MX (2) | MX152777A (en) |
| NL (1) | NL8006295A (en) |
| NO (1) | NO158554C (en) |
| NZ (1) | NZ195635A (en) |
| PT (1) | PT72081B (en) |
| SE (1) | SE8007945L (en) |
| ZA (1) | ZA806860B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4565475A (en) * | 1979-11-26 | 1986-01-21 | Illinois Tool Works Inc. | Drill point milling machine and method |
| GB2100628B (en) * | 1981-06-25 | 1985-04-11 | Shinjo Seisakusho Yk | A drill screw |
| US4395173A (en) * | 1981-06-30 | 1983-07-26 | Illinois Tool Works Inc. | Drill screw with protective burrs |
| JP2865823B2 (en) * | 1990-07-23 | 1999-03-08 | 国分化学工業株式会社 | Drill screw |
| CH686637A5 (en) * | 1992-06-18 | 1996-05-15 | Mungo Befestigungstech Ag | Schraubhulse. |
| DE102016222937A1 (en) * | 2016-11-21 | 2018-05-24 | Swg Schraubenwerk Gaisbach Gmbh | Wood screw and method of making a wood screw |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1294268A (en) * | 1915-08-26 | 1919-02-11 | Edward C Holmes | Screw-spike. |
| SE345504B (en) * | 1966-05-10 | 1972-05-29 | Illinois Tool Works | |
| GB1283834A (en) * | 1970-04-23 | 1972-08-02 | Le Metallichesky Zd Im Xxii Si | Milling cutters |
| DE2306010A1 (en) * | 1972-02-29 | 1973-09-20 | Athoze | CUTTERS FOR THE PRODUCTION OF CONVEX SURFACES |
| US3786713A (en) * | 1971-10-15 | 1974-01-22 | Illinois Tool Works | Chip breaker drill screw |
| US3933075A (en) * | 1973-08-08 | 1976-01-20 | Elco Industries, Inc. | Self-drilling fastener and method of making same |
| GB1574126A (en) * | 1977-02-21 | 1980-09-03 | Grinding Aids Ltd | Cutting tool for a mchine tool |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2479730A (en) * | 1944-05-10 | 1949-08-23 | Lockheed Aircraft Corp | Screw |
| GB788745A (en) * | 1955-05-18 | 1958-01-08 | Ronald Fredrick Cox | Improved twist drill |
| GB911025A (en) * | 1959-10-30 | 1962-11-21 | Gunther Claas | Method for the production of cutting tools |
| US3789725A (en) * | 1971-10-06 | 1974-02-05 | B Lindstrom | Self-drilling and self-tapping fastener and method of manufacture thereof |
| US4147088A (en) * | 1977-03-16 | 1979-04-03 | Nl Industries, Inc. | Drill screw |
| JPS61567Y2 (en) * | 1978-01-18 | 1986-01-10 | ||
| JPS6128886Y2 (en) * | 1978-02-20 | 1986-08-27 | ||
| US4295768A (en) * | 1979-09-21 | 1981-10-20 | Usm Corporation | Chip breaker screws |
-
1980
- 1980-11-04 CA CA000363978A patent/CA1175688A/en not_active Expired
- 1980-11-06 ZA ZA00806860A patent/ZA806860B/en unknown
- 1980-11-10 AU AU64220/80A patent/AU539311B2/en not_active Ceased
- 1980-11-12 SE SE8007945A patent/SE8007945L/en unknown
- 1980-11-17 MX MX184800A patent/MX152777A/en unknown
- 1980-11-17 MX MX203144A patent/MX171209B/en unknown
- 1980-11-18 NL NL8006295A patent/NL8006295A/en not_active Application Discontinuation
- 1980-11-20 PT PT72081A patent/PT72081B/en not_active IP Right Cessation
- 1980-11-20 FR FR8024643A patent/FR2470281B1/en not_active Expired
- 1980-11-20 DE DE19803044001 patent/DE3044001A1/en active Granted
- 1980-11-21 BR BR8007606A patent/BR8007606A/en not_active IP Right Cessation
- 1980-11-24 AT AT0572880A patent/AT380733B/en not_active IP Right Cessation
- 1980-11-25 LU LU82954A patent/LU82954A1/en unknown
- 1980-11-25 NO NO803548A patent/NO158554C/en unknown
- 1980-11-25 IT IT26206/80A patent/IT1134443B/en active
- 1980-11-25 FI FI803666A patent/FI77094C/en not_active IP Right Cessation
- 1980-11-25 NZ NZ195635A patent/NZ195635A/en unknown
- 1980-11-25 CH CH871880A patent/CH640318A5/en not_active IP Right Cessation
- 1980-11-25 BE BE2/58871A patent/BE886331A/en not_active IP Right Cessation
- 1980-11-25 IE IE2443/80A patent/IE51184B1/en not_active IP Right Cessation
- 1980-11-25 AR AR283359A patent/AR224552A1/en active
- 1980-11-25 ES ES1980263215U patent/ES263215Y/en not_active Expired
- 1980-11-26 GB GB8037945A patent/GB2063731B/en not_active Expired
- 1980-11-26 JP JP16543980A patent/JPS5686217A/en active Granted
- 1980-11-26 GB GB8223181A patent/GB2100157B/en not_active Expired
- 1980-11-26 DK DK502480A patent/DK151590C/en active
- 1980-11-26 GB GB08223182A patent/GB2101022B/en not_active Expired
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1294268A (en) * | 1915-08-26 | 1919-02-11 | Edward C Holmes | Screw-spike. |
| SE345504B (en) * | 1966-05-10 | 1972-05-29 | Illinois Tool Works | |
| GB1283834A (en) * | 1970-04-23 | 1972-08-02 | Le Metallichesky Zd Im Xxii Si | Milling cutters |
| US3786713A (en) * | 1971-10-15 | 1974-01-22 | Illinois Tool Works | Chip breaker drill screw |
| DE2306010A1 (en) * | 1972-02-29 | 1973-09-20 | Athoze | CUTTERS FOR THE PRODUCTION OF CONVEX SURFACES |
| US3933075A (en) * | 1973-08-08 | 1976-01-20 | Elco Industries, Inc. | Self-drilling fastener and method of making same |
| GB1574126A (en) * | 1977-02-21 | 1980-09-03 | Grinding Aids Ltd | Cutting tool for a mchine tool |
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