CA1285798C - Groove point screw - Google Patents
Groove point screwInfo
- Publication number
- CA1285798C CA1285798C CA000527069A CA527069A CA1285798C CA 1285798 C CA1285798 C CA 1285798C CA 000527069 A CA000527069 A CA 000527069A CA 527069 A CA527069 A CA 527069A CA 1285798 C CA1285798 C CA 1285798C
- Authority
- CA
- Canada
- Prior art keywords
- fastener
- drilling
- cutting
- pair
- cutting edge
- 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.)
- Expired - Fee Related
Links
- 238000005520 cutting process Methods 0.000 claims abstract description 33
- 238000005553 drilling Methods 0.000 claims abstract description 29
- 230000013011 mating Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000005242 forging Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010273 cold forging Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- HEMJJKBWTPKOJG-UHFFFAOYSA-N Gemfibrozil Chemical compound CC1=CC=C(C)C(OCCCC(C)(C)C(O)=O)=C1 HEMJJKBWTPKOJG-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000007567 mass-production technique Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 230000009467 reduction 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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/56—Making machine elements screw-threaded elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- 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
- F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
- F16B25/0021—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being metal, e.g. sheet-metal or aluminium
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/18—Configuration of the drill point
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/48—Chip breakers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Forging (AREA)
- Drilling Tools (AREA)
- Connection Of Plates (AREA)
Abstract
Abstract Of Disclosure A drilling and thread forming fastener is provided having a threaded shank and a pilot end.
A pair of cutting surfaces are provided on the pilot end, each surface terminating in a cutting edge having a linear groove, arcuate in cross-section disposed adjacent the cutting edge.
A pair of cutting surfaces are provided on the pilot end, each surface terminating in a cutting edge having a linear groove, arcuate in cross-section disposed adjacent the cutting edge.
Description
~as7ss 1 Groove Point Screw Back round Of The Invention The present invention relates to a rotary threaded fastener of the self-drilling and threading type and more particularly to a fastener which is manufactured by a pair of forging dies.
Self-drilling and thread forming fasteners are well known in the art. Some of these fasteners are particularly adopted for manufacturer by a milling process, others for manufacture by a forging process which employs a pair of matched dies, and some are susceptible to manufacture by either process. A typical example of a type of drilling and thread forming fastener which is preferably formed by the forging process is shown in U.S. Patent No. 3,395,603, issued August 6, 1968 to E.J. Skierski and assigned to the assignee of the present invention. Fas~eners manufactured in accordance with the teachings of the aforementioned patent have met with wide acceptance as they provide a fastener which is simple to use, requiring no pre-drilling of the structure to which it is assembled, and these fasteners have proven to be easy to manufacture by mass production techniques.
As the use of these self-drilling and thread forming fasteners has increased, the requirement for the reduction in drilling time of the fastener has become important, particularly in those instances such as 12~.~i798 automobile manufacture, metal building construction, etc.
wherein a large number of these fasteners are employed, and in particular, where mass production lines are employed to produce the product. In developing an improved threaded fastener of the self-drilling and threading type, therefore, a decrease in drilling time has become an ever important factor in the design.
It is therefore an object of the present invention to provide a drilling and thread forming fastener which exhibits a decrease in drilling time over those drilling and thread forming fasteners of the prior art.
It is a further object of the present invention to provide a drilling and -thread forming fastener wherein the fastener exhibits an improvement in drilling time, particularly in the initial stages of the drilling.
Yet another object of the inventin is to provide a drilling and thread forming fastener whlch exhibits an overall improvement in perEormance over those drilling and thread forming fasteners oE the prior art.
Summary of the Inv tion According to the above objects, from a broad aspect, the present invention provides a drilling and thread forming fastener which comprises a threaded shank and a pilot end having a pair of transverse axes intersecting at the center-line of the fastener. A pair of flutes extends longitudi-nally over the pilot end to form a pair of cutting surfaces, lZ~
in cross-section defining one of the axes and terminating in a cutting edge. The flutes further form a pair of lands concentric with the centerline of the shank. Each land has an arcuate surface extending outwardly to define the other of the axes at its radial extent on any cross-section of the pilot end. A linear groove, arcuate in cross-section, is formed in each of the cutting surfaces adjacent to the cutting edge. The groove extends over the entire length of the cutting edge and has a depth of from about 15 to about 40 percent of the distance between the cutting edges.
In a more detailed sense, the drilling and thread forming fastener may be provided with an axis defined by the cutting surface which is of a greater magnitude than the axis defined by the arcua-te surfaces of the lands.
A drilling and thread forming fastener may also be provided wherein the groove extends over the entire length of the cutting edge.
A pair of mating dies for forming the pilot end of a drilling fastener therebe-tween in a cold forging process is provided wherein each mating die comprises a portion disposed for forming a cuttlng surface on a workpiece by forcing the dies together against the workpiece during the forging process, the surfaces terminating at a mating surface of the dies a protruding portion arcuate in cross-section extends from the cutting surface forming portion adjacent the mating surface for forming a groove in the fastener cutting surface, during the cold forging process.
~z~5~ga 1 B 'ef Descri tion of the Drawin rl P q Reference is made to the accompanying drawing in which there is shown an illustrative embodiment of the invention from which its novel features and advantages will be apparent, wherein:
Fig. 1 is a fragmentary elevational view of a drilling and thread forming fastener constructed in accordance with the teachings of the subject invention;
Fig. 2 is an elevational view showing the fastener of Fig. 1 rotated through 90;
Fig. 3 is an end view taken on an enlarged scale, showing further details of the fastener depicted in Fig.
1 and Pig. 2;
Fig. 4 is a prospective view showing an end portion of the fastener of Fig. 1 and Fig. 2 in detail;
Fig. 5 is an enlarged sectional view taken along the line V-V of Fig. 1 in detail;
Fig. 6 is a schematic view showing a prior art fastener during application;
Fig.7 is a schematic view similar to Fig. 6 showing the fastener of Fig. 1 and Fig 2 during application; and Fig. 8 is an elevational perspective view showing one of a pair of mating dies employed in forming the fastener of Fig. 1 and Fig. 2.
1 Descr1ption Of A Pre~erred Embodiment Referring now to the drawing and in particular to ~igures 1-4 there is shown a drilling and thread forming fastener 10 having a shank 12 on which a continuous thread 14 is formed, and a pilot end 16. The fastener 10 is substantially symmetrical about the centerline of the shank 12, however, having a transverse major axis x-x and a transverse minor axis y-y intersecting at the centerline of the pilot end 16. A pair of flutes 18 and 20 are formed in the pilot end 16 and extend longitudinally over the length of the pilot end to form a pair of cutting surfaces 22, 24 extending along the major axis and in general defining the extent of the major axis of the fastener at any section thereof.
Each of the cutting surfaces 22 and 24 terminates in a cutting edge 26, 28 which forms an acute angle with the centerline of the fastener 10. The cutting edge 26, 28 is disposed for preliminary entry into the metal surface to provide a lead for the pilot end 16 of the fastener.
Each of the flutes 18, 20 further serves to define a pair of lands 30, 32 which are concentric with the centerline of the shank 12. The lands each have an arcuate surface 34, 36 projecting outwardly to define the minor axis at its radial extent on any cross-section of the pilot end 16.
lZ~5798 As shown in Figures 1-4, the fastener 10 i5 provided with a pair of linear grooves 38, 40 formed in the cutting surface 22 or 24 adj~cent the cutting edge 26 or 28 respectively. In the embodiment shown, the linear groove 38, 40 extends over the entire length of the respective cutting edge 26 or 28.
Referring to Figure 5, the groove 38 is shown to be arcuate in cross-section and is not restricted to being a true circular arc. The effect of the linear groove 38 lo or 40 is to produce a continuous chip, as best shown in Figure 7 rather than a plurality of ~mall chip segments, which are produced by fasteners of the prior art (shown in Figure 6), thereby providing a chip which will flow smoothly through the flute 18 or 20 and from the hole being drilled by the fastener.
In for~ing the groove ~8, in order to maintain the integrity of the fastener is has been found that the groove depth D should be approximately from 15 percent to 40 percent of the web thickness W, as shown in Fig. 3.
Referring now to Figure 8, there is shown a die 50 which is one of a pair of mating dies employed to produce the fasteners shown in Figures 1-4. The die 50 is si~ilar to that shown in the aforementioned U.S.
Patent to Skierski, but incorporates the improvement providing a fastener described with references to Figures 1-7.
12~57~3 1 The die 50 comprises a portion 52 dispo~ed for forming the cutting su~face 22 on a workpiece ~nd related surface for forming the pilot end 16 of the fastener in a forging process, which is well-known in the art.
In order to accomplish the objective of the present invention, the surface 52, and its similar surface on the mating die is provided with a protruding portion 54 arcuate in cross-section, which extends from the cutting surface forming portion 52 and is effective to produce the linear groove 38 when the pilot end is formed in a fastener during the cold forging process. ln the embodiment shown, the burface 52 terminates at a mating surface of the die cooperating with the die 50 at a linear portion 56 and the protruding portion 54 extends along the line of the mating surface in order to produce the groove 38 (or groove 40) in the fastener 10 described with reference to Figures 1-4.
It has been found with the structure hereinbefore described that the linear groove 38 or 40 provided in the cutting surface 22 or 24 of the pilot en~ 16 is effective to produce a planing action due to the low lip relief angle, and thereby exhibits improved performance of faster drilling time. The cutting surface 22 or 24 having the linear groove 38 or 40 respectively formed therein creates a scooping action at the extremity of the drill tip which is extremely effective in the initial stage of drilling.
121~i~8 1 As further descrlbed with reference to Figures 6 and 7, the linear groove 3B, 40 formed in the cutting surface 22 or 24, respectively, produces a continuous chip which serves as a mechanism for drawing the point through the material being drilled, thereby exhibiting improved performance and faster drilling times
Self-drilling and thread forming fasteners are well known in the art. Some of these fasteners are particularly adopted for manufacturer by a milling process, others for manufacture by a forging process which employs a pair of matched dies, and some are susceptible to manufacture by either process. A typical example of a type of drilling and thread forming fastener which is preferably formed by the forging process is shown in U.S. Patent No. 3,395,603, issued August 6, 1968 to E.J. Skierski and assigned to the assignee of the present invention. Fas~eners manufactured in accordance with the teachings of the aforementioned patent have met with wide acceptance as they provide a fastener which is simple to use, requiring no pre-drilling of the structure to which it is assembled, and these fasteners have proven to be easy to manufacture by mass production techniques.
As the use of these self-drilling and thread forming fasteners has increased, the requirement for the reduction in drilling time of the fastener has become important, particularly in those instances such as 12~.~i798 automobile manufacture, metal building construction, etc.
wherein a large number of these fasteners are employed, and in particular, where mass production lines are employed to produce the product. In developing an improved threaded fastener of the self-drilling and threading type, therefore, a decrease in drilling time has become an ever important factor in the design.
It is therefore an object of the present invention to provide a drilling and thread forming fastener which exhibits a decrease in drilling time over those drilling and thread forming fasteners of the prior art.
It is a further object of the present invention to provide a drilling and -thread forming fastener wherein the fastener exhibits an improvement in drilling time, particularly in the initial stages of the drilling.
Yet another object of the inventin is to provide a drilling and thread forming fastener whlch exhibits an overall improvement in perEormance over those drilling and thread forming fasteners oE the prior art.
Summary of the Inv tion According to the above objects, from a broad aspect, the present invention provides a drilling and thread forming fastener which comprises a threaded shank and a pilot end having a pair of transverse axes intersecting at the center-line of the fastener. A pair of flutes extends longitudi-nally over the pilot end to form a pair of cutting surfaces, lZ~
in cross-section defining one of the axes and terminating in a cutting edge. The flutes further form a pair of lands concentric with the centerline of the shank. Each land has an arcuate surface extending outwardly to define the other of the axes at its radial extent on any cross-section of the pilot end. A linear groove, arcuate in cross-section, is formed in each of the cutting surfaces adjacent to the cutting edge. The groove extends over the entire length of the cutting edge and has a depth of from about 15 to about 40 percent of the distance between the cutting edges.
In a more detailed sense, the drilling and thread forming fastener may be provided with an axis defined by the cutting surface which is of a greater magnitude than the axis defined by the arcua-te surfaces of the lands.
A drilling and thread forming fastener may also be provided wherein the groove extends over the entire length of the cutting edge.
A pair of mating dies for forming the pilot end of a drilling fastener therebe-tween in a cold forging process is provided wherein each mating die comprises a portion disposed for forming a cuttlng surface on a workpiece by forcing the dies together against the workpiece during the forging process, the surfaces terminating at a mating surface of the dies a protruding portion arcuate in cross-section extends from the cutting surface forming portion adjacent the mating surface for forming a groove in the fastener cutting surface, during the cold forging process.
~z~5~ga 1 B 'ef Descri tion of the Drawin rl P q Reference is made to the accompanying drawing in which there is shown an illustrative embodiment of the invention from which its novel features and advantages will be apparent, wherein:
Fig. 1 is a fragmentary elevational view of a drilling and thread forming fastener constructed in accordance with the teachings of the subject invention;
Fig. 2 is an elevational view showing the fastener of Fig. 1 rotated through 90;
Fig. 3 is an end view taken on an enlarged scale, showing further details of the fastener depicted in Fig.
1 and Pig. 2;
Fig. 4 is a prospective view showing an end portion of the fastener of Fig. 1 and Fig. 2 in detail;
Fig. 5 is an enlarged sectional view taken along the line V-V of Fig. 1 in detail;
Fig. 6 is a schematic view showing a prior art fastener during application;
Fig.7 is a schematic view similar to Fig. 6 showing the fastener of Fig. 1 and Fig 2 during application; and Fig. 8 is an elevational perspective view showing one of a pair of mating dies employed in forming the fastener of Fig. 1 and Fig. 2.
1 Descr1ption Of A Pre~erred Embodiment Referring now to the drawing and in particular to ~igures 1-4 there is shown a drilling and thread forming fastener 10 having a shank 12 on which a continuous thread 14 is formed, and a pilot end 16. The fastener 10 is substantially symmetrical about the centerline of the shank 12, however, having a transverse major axis x-x and a transverse minor axis y-y intersecting at the centerline of the pilot end 16. A pair of flutes 18 and 20 are formed in the pilot end 16 and extend longitudinally over the length of the pilot end to form a pair of cutting surfaces 22, 24 extending along the major axis and in general defining the extent of the major axis of the fastener at any section thereof.
Each of the cutting surfaces 22 and 24 terminates in a cutting edge 26, 28 which forms an acute angle with the centerline of the fastener 10. The cutting edge 26, 28 is disposed for preliminary entry into the metal surface to provide a lead for the pilot end 16 of the fastener.
Each of the flutes 18, 20 further serves to define a pair of lands 30, 32 which are concentric with the centerline of the shank 12. The lands each have an arcuate surface 34, 36 projecting outwardly to define the minor axis at its radial extent on any cross-section of the pilot end 16.
lZ~5798 As shown in Figures 1-4, the fastener 10 i5 provided with a pair of linear grooves 38, 40 formed in the cutting surface 22 or 24 adj~cent the cutting edge 26 or 28 respectively. In the embodiment shown, the linear groove 38, 40 extends over the entire length of the respective cutting edge 26 or 28.
Referring to Figure 5, the groove 38 is shown to be arcuate in cross-section and is not restricted to being a true circular arc. The effect of the linear groove 38 lo or 40 is to produce a continuous chip, as best shown in Figure 7 rather than a plurality of ~mall chip segments, which are produced by fasteners of the prior art (shown in Figure 6), thereby providing a chip which will flow smoothly through the flute 18 or 20 and from the hole being drilled by the fastener.
In for~ing the groove ~8, in order to maintain the integrity of the fastener is has been found that the groove depth D should be approximately from 15 percent to 40 percent of the web thickness W, as shown in Fig. 3.
Referring now to Figure 8, there is shown a die 50 which is one of a pair of mating dies employed to produce the fasteners shown in Figures 1-4. The die 50 is si~ilar to that shown in the aforementioned U.S.
Patent to Skierski, but incorporates the improvement providing a fastener described with references to Figures 1-7.
12~57~3 1 The die 50 comprises a portion 52 dispo~ed for forming the cutting su~face 22 on a workpiece ~nd related surface for forming the pilot end 16 of the fastener in a forging process, which is well-known in the art.
In order to accomplish the objective of the present invention, the surface 52, and its similar surface on the mating die is provided with a protruding portion 54 arcuate in cross-section, which extends from the cutting surface forming portion 52 and is effective to produce the linear groove 38 when the pilot end is formed in a fastener during the cold forging process. ln the embodiment shown, the burface 52 terminates at a mating surface of the die cooperating with the die 50 at a linear portion 56 and the protruding portion 54 extends along the line of the mating surface in order to produce the groove 38 (or groove 40) in the fastener 10 described with reference to Figures 1-4.
It has been found with the structure hereinbefore described that the linear groove 38 or 40 provided in the cutting surface 22 or 24 of the pilot en~ 16 is effective to produce a planing action due to the low lip relief angle, and thereby exhibits improved performance of faster drilling time. The cutting surface 22 or 24 having the linear groove 38 or 40 respectively formed therein creates a scooping action at the extremity of the drill tip which is extremely effective in the initial stage of drilling.
121~i~8 1 As further descrlbed with reference to Figures 6 and 7, the linear groove 3B, 40 formed in the cutting surface 22 or 24, respectively, produces a continuous chip which serves as a mechanism for drawing the point through the material being drilled, thereby exhibiting improved performance and faster drilling times
Claims (3)
1. A drilling and thread forming fastener comprising a threaded shank and a pilot end having a pair of transverse axes intersecting at the centerline of said fastener, a pair of flutes extending longitudinally over said pilot end to form a pair of cutting surfaces, in cross-section defining one of said axes and terminating in a cutting edge, said flutes further forming a pair of lands concentric with the centerline of said shank, each land having an arcuate surface extending outwardly to define the other of said axes at its radial extent on any cross-section of said pilot end, and a linear groove arcuate in cross-section formed in each said cutting surface adjacent to said cutting edge, wherein said groove extends over the entire length of said cutting edge and has a depth of from about 15 to about 40 percent of the distance between said cutting edges.
2. A drilling and thread forming fastener as set forth in claim 1 wherein said axis defined by said cutting surfaces is of greater magnitude than said axis defined by said arcuate surfaces of said lands.
3. A drilling and thread forming fastener as set forth in claim 1 wherein each said cutting edge is disposed at an arcuate angle with said centerline.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US81730386A | 1986-01-09 | 1986-01-09 | |
| US817,303 | 1986-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1285798C true CA1285798C (en) | 1991-07-09 |
Family
ID=25222773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000527069A Expired - Fee Related CA1285798C (en) | 1986-01-09 | 1987-01-09 | Groove point screw |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS62242111A (en) |
| AU (1) | AU586060B2 (en) |
| CA (1) | CA1285798C (en) |
| CH (1) | CH672171A5 (en) |
| DE (1) | DE3700499C2 (en) |
| FR (1) | FR2592693B1 (en) |
| GB (1) | GB2185915B (en) |
| IT (1) | IT1215326B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4802807A (en) * | 1988-04-14 | 1989-02-07 | Illinois Tool Works Inc. | Threaded fastener |
| EP1764519A1 (en) * | 2005-09-20 | 2007-03-21 | Taiwan Shan Yin International Co., Ltd. | Screw with multiple cutting ridges in end section |
| DE102007052152A1 (en) | 2007-10-31 | 2009-05-07 | Robert Bosch Gmbh | navigation system |
| TW201350690A (en) * | 2012-06-12 | 2013-12-16 | Yuan-Qi Li | Screw drill tail structure |
| JP6282160B2 (en) * | 2014-04-07 | 2018-02-21 | 北村精工株式会社 | Drill screw |
| TW201716697A (en) * | 2015-11-11 | 2017-05-16 | xiao-wen Huang | Self-tapping screw drilling tail structure for enhancing drilling capability and speed of drill/cut edges to achieve high screwing speed and labor saving |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD72426A (en) * | ||||
| GB940206A (en) * | 1960-06-14 | 1963-10-23 | Brooke Tool Mfg Company Ltd | Improvements relating to drills |
| US3199381A (en) * | 1963-03-04 | 1965-08-10 | Bruce A Mackey | Twist drill |
| US3463045A (en) * | 1966-05-10 | 1969-08-26 | Illinois Tool Works | Drilling screw |
| US3395603A (en) * | 1966-09-13 | 1968-08-06 | Parker Kaion Corp | Rotary threaded fasteners |
| FR1536635A (en) * | 1966-09-13 | 1968-08-16 | Parker Kalon Corp | Rotary threaded fastener or screw |
| US3550255A (en) * | 1968-07-05 | 1970-12-29 | Parker Kalon Corp | Method of making rotary threaded fasteners |
| AT350334B (en) * | 1977-01-19 | 1979-05-25 | Sfs Stadler Ag | SELF-DRILLING SCREW |
| JPS61567Y2 (en) * | 1978-01-18 | 1986-01-10 | ||
| US4295768A (en) * | 1979-09-21 | 1981-10-20 | Usm Corporation | Chip breaker screws |
| GB2100628B (en) * | 1981-06-25 | 1985-04-11 | Shinjo Seisakusho Yk | A drill screw |
| NZ202991A (en) * | 1982-02-05 | 1985-11-08 | Usm Corp | Rotary threaded drilling and thread-forming screw with radiused drag surfaces in drilling portion |
| JPS597046A (en) * | 1982-07-03 | 1984-01-14 | 日東紡績株式会社 | Synthetic-resin laminated board enabling sharp cutting by laser beam |
| JPS6024981U (en) * | 1983-07-27 | 1985-02-20 | 小島 隆男 | intake and exhaust valve |
-
1987
- 1987-01-06 AU AU67160/87A patent/AU586060B2/en not_active Ceased
- 1987-01-06 CH CH17/87A patent/CH672171A5/fr not_active IP Right Cessation
- 1987-01-06 GB GB8700157A patent/GB2185915B/en not_active Expired
- 1987-01-08 JP JP62002576A patent/JPS62242111A/en active Pending
- 1987-01-08 FR FR878700120A patent/FR2592693B1/en not_active Expired - Fee Related
- 1987-01-08 IT IT8719016A patent/IT1215326B/en active
- 1987-01-09 DE DE3700499A patent/DE3700499C2/en not_active Expired - Fee Related
- 1987-01-09 CA CA000527069A patent/CA1285798C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62242111A (en) | 1987-10-22 |
| FR2592693A1 (en) | 1987-07-10 |
| CH672171A5 (en) | 1989-10-31 |
| FR2592693B1 (en) | 1991-05-31 |
| AU586060B2 (en) | 1989-06-29 |
| DE3700499C2 (en) | 1996-07-11 |
| GB2185915B (en) | 1989-11-22 |
| IT8719016A0 (en) | 1987-01-08 |
| DE3700499A1 (en) | 1987-07-16 |
| GB8700157D0 (en) | 1987-02-11 |
| AU6716087A (en) | 1987-07-16 |
| GB2185915A (en) | 1987-08-05 |
| IT1215326B (en) | 1990-02-08 |
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