US20030231940A1 - Wood screw - Google Patents
Wood screw Download PDFInfo
- Publication number
- US20030231940A1 US20030231940A1 US10/261,924 US26192402A US2003231940A1 US 20030231940 A1 US20030231940 A1 US 20030231940A1 US 26192402 A US26192402 A US 26192402A US 2003231940 A1 US2003231940 A1 US 2003231940A1
- Authority
- US
- United States
- Prior art keywords
- shank
- radius
- screw
- segment
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002023 wood Substances 0.000 title abstract description 33
- 241000826860 Trapezium Species 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
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
- F16B25/001—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
- F16B25/0015—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 a soft organic material, e.g. wood or plastic
-
- 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
- F16B25/0078—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw with a shaft of non-circular cross-section or other special geometric features of the shaft
Definitions
- This invention relates to a wood screw, more particularly to a wood screw with a low driving torque requirement.
- a conventional wood screw 1 is shown to include a head 11 and a shank 12 extending from the head 11 and formed with a screw thread 13 . It is noted that when the conventional wood screw 1 is in use, a large driving torque is required, which can result in breaking of the same.
- the object of the present invention is to provide a wood screw with a low driving torque requirement, which can be produced at a relatively low cost, and which can maintain a sufficient holding effect with wood material.
- a wood screw includes a head part, a tapered insert part, and a shank part disposed between the head part and the tapered insert part and having a shank axis.
- the shank part has a first shank segment adjacent to the head part, and a second shank segment adjacent to the tapered insert part.
- the first shank segment has a first radius relative to the shank axis.
- the second shank segment has a surface that is formed with a screw thread.
- the screw thread includes interconnected thread sections that have a second radius relative to the shank axis and larger than the first radius.
- the surface of the second shank segment is further formed with at least one projecting element between two neighboring interconnected ones of the thread sections that are proximate to the tapered insert part.
- the projecting element has a greatest radial dimension with respect to the shank axis that is greater than the first radius and less than the second radius.
- all of the thread sections on the surface of the second shank segment have the second radius relative to the shank axis.
- the two neighboring interconnected ones of the thread sections on the surface of the second shank segment have a third radius relative to the shank axis that is greater than the first radius and less than the second radius, and remaining ones of the thread sections on the surface of the second shank segment have the second radius relative to the shank axis.
- the third radius is not less than the greatest radial dimension of the projecting element.
- FIG. 1 is a perspective view of a conventional wood screw
- FIG. 2 illustrates another conventional wood screw
- FIG. 3 is a perspective view of a first preferred embodiment of the wood screw according to the present invention.
- FIG. 4 is a schematic partly sectional view illustrating the first preferred embodiment of the present invention when driven into a wooden object
- FIG. 5 is a schematic partly sectional view illustrating a second preferred embodiment of the wood screw according to the present invention when driven into a wooden object;
- FIG. 6 is a perspective view of a third preferred embodiment of the wood screw according to the present invention.
- FIG. 7 is a cross-sectional view of the third preferred embodiment
- FIG. 8 is a cross-sectional view of a fourth preferred embodiment of the wood screw according to the present invention.
- FIG. 9 is a cross-sectional view of a fifth preferred embodiment of the wood screw according to the present invention.
- the first preferred embodiment of the wood screw 3 is shown to include a head part 30 , a tapered insert part 32 , and a shank part 31 disposed between the head part 30 and the tapered insert part 32 and having a shank axis (A).
- the shank part 31 includes a first shank segment 311 adjacent to the head part 30 , and a second shank segment 312 adjacent to the tapered insert part 32 .
- the first shank segment 311 has a non-threaded surface, and a first radius (r0) relative to the shank axis (A).
- the second shank segment 312 has a surface that is formed with a screw thread 33 .
- the screw thread 33 includes interconnected thread sections 34 .
- all of the thread sections 34 on the surface of the second shank segment 312 have a second radius (r1) relative to the shank axis (A).
- the second radius (r1) is larger than the first radius (r0).
- the surface of the second shank segment 312 is further formed with at least one projecting element 38 between two neighboring interconnected ones of the thread sections 34 that are proximate to the tapered insert part 32 .
- the projecting element 38 has a greatest radial dimension (r2) with respect to the shank axis (A) that is greater than the first radius (r0) and less than the second radius (r1).
- each projecting element 38 is formed as a plate that projects radially relative to the shank-axis (A) and that has a convex shaving edge 380 .
- the projecting elements 38 serve to enlarge the periphery of the hole formed by the tapered insert part 32 such that the torque necessary to drive the wood screw 3 into a wooden object is accordingly reduced. This low torque requirement also prevents the formation of cracks in the wooden object during the screw driving operation.
- FIG. 5 illustrates a second preferred embodiment of the wood screw 3 ′ according to the present invention.
- the two neighboring interconnected ones of the thread sections 341 on the surface of the second shank segment 312 have a third radius (r3) relative to the shank axis (A).
- the remaining ones of the thread sections 34 on the surface of the second shank segment 312 have the second radius (r1) relative to the shank axis (A).
- the third radius (r3) is greater than the first radius (r0) of the first shank segment 311 and is less than the second radius (r1).
- the third radius (r3) is not less than the greatest radial dimension (r2) of the projecting elements 38 .
- the driving torque required for the wood screw 3 ′ of the present invention is about 40% less as compared to the conventional wood screw 1 .
- each projecting element 48 is formed as a rib that extends parallel to the shank axis (A).
- each projecting element 48 has a rounded cross-section along a plane transverse to the shank axis (A) (see FIG. 7).
- each projecting element 58 has a triangular or tapering cross-section along a plane transverse to the shank axis.
- each projecting element 68 has a generally trapezium cross-section along a plane transverse to the shank axis.
- the wood screw of the present invention can be manufactured at a relatively low cost and fastened into a wooden object with a relatively low driving torque requirement and without reducing the holding effect between the wood screw and the wooden object.
- the object of the present invention is thus met.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Wood Science & Technology (AREA)
- Joining Of Building Structures In Genera (AREA)
- Connection Of Plates (AREA)
Abstract
A wood screw includes a head part, a tapered insert part, and a shank part disposed between the head part and the tapered insert part. The shank part has first and second shank segments adjacent to the head part and the tapered insert part, respectively. The first shank segment has a first radius. The second shank segment has a surface that is formed with a screw thread. The screw thread includes interconnected thread sections that have a second radius larger than the first radius. The surface of the second shank segment is further formed with at least one projecting element between two neighboring interconnected ones of the thread sections that are proximate to the tapered insert part. The projecting element has a greatest radial dimension with respect to the shank axis that is greater than the first radius and less than the second radius.
Description
- 1. Field of the Invention
- This invention relates to a wood screw, more particularly to a wood screw with a low driving torque requirement.
- 2. Description of the Related Art
- Referring to FIG. 1, a
conventional wood screw 1 is shown to include ahead 11 and ashank 12 extending from thehead 11 and formed with ascrew thread 13. It is noted that when theconventional wood screw 1 is in use, a large driving torque is required, which can result in breaking of the same. - To overcome the aforesaid drawback, another
conventional wood screw 2 has been proposed heretofore in U.S. Pat. No. 4,874,278, and includes ahead 21, ashank 22 extending from thehead 21, and a chip-removingportion 24 disposed between atip guide portion 23 and afastening screw portion 25 of theshank 22, as best shown in FIG. 2. In accordance with this design, chips produced at a time when a hole is bored are conveyed and spread toward the side of theshank 22 attached to thehead 21 by this chip-removingportion 24. Therefore, blocking by chips can be prevented, and screw driving with low torque can be achieved. - However, because the structure of the chip-removing
portion 24 is difficult to form, a high manufacturing cost cannot be avoided. Moreover, due to the configuration of the chip-removingportion 24, over-boring can occur and can reduce the holding effect between thewood screw 2 and wood material. - Therefore, the object of the present invention is to provide a wood screw with a low driving torque requirement, which can be produced at a relatively low cost, and which can maintain a sufficient holding effect with wood material.
- According to this invention, a wood screw includes a head part, a tapered insert part, and a shank part disposed between the head part and the tapered insert part and having a shank axis. The shank part has a first shank segment adjacent to the head part, and a second shank segment adjacent to the tapered insert part. The first shank segment has a first radius relative to the shank axis. The second shank segment has a surface that is formed with a screw thread. The screw thread includes interconnected thread sections that have a second radius relative to the shank axis and larger than the first radius. The surface of the second shank segment is further formed with at least one projecting element between two neighboring interconnected ones of the thread sections that are proximate to the tapered insert part. The projecting element has a greatest radial dimension with respect to the shank axis that is greater than the first radius and less than the second radius.
- In one embodiment, all of the thread sections on the surface of the second shank segment have the second radius relative to the shank axis.
- In another embodiment, the two neighboring interconnected ones of the thread sections on the surface of the second shank segment have a third radius relative to the shank axis that is greater than the first radius and less than the second radius, and remaining ones of the thread sections on the surface of the second shank segment have the second radius relative to the shank axis. Preferably, the third radius is not less than the greatest radial dimension of the projecting element.
- Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments of the present invention, with reference to the accompanying drawings, in which:
- FIG. 1 is a perspective view of a conventional wood screw;
- FIG. 2 illustrates another conventional wood screw;
- FIG. 3 is a perspective view of a first preferred embodiment of the wood screw according to the present invention;
- FIG. 4 is a schematic partly sectional view illustrating the first preferred embodiment of the present invention when driven into a wooden object;
- FIG. 5 is a schematic partly sectional view illustrating a second preferred embodiment of the wood screw according to the present invention when driven into a wooden object;
- FIG. 6 is a perspective view of a third preferred embodiment of the wood screw according to the present invention;
- FIG. 7 is a cross-sectional view of the third preferred embodiment;
- FIG. 8 is a cross-sectional view of a fourth preferred embodiment of the wood screw according to the present invention; and
- FIG. 9 is a cross-sectional view of a fifth preferred embodiment of the wood screw according to the present invention.
- Referring to FIGS. 3 and 4, the first preferred embodiment of the
wood screw 3 according to the present invention is shown to include ahead part 30, atapered insert part 32, and ashank part 31 disposed between thehead part 30 and thetapered insert part 32 and having a shank axis (A). Theshank part 31 includes afirst shank segment 311 adjacent to thehead part 30, and asecond shank segment 312 adjacent to thetapered insert part 32. Thefirst shank segment 311 has a non-threaded surface, and a first radius (r0) relative to the shank axis (A). Thesecond shank segment 312 has a surface that is formed with ascrew thread 33. Thescrew thread 33 includes interconnectedthread sections 34. In this embodiment, all of thethread sections 34 on the surface of thesecond shank segment 312 have a second radius (r1) relative to the shank axis (A). The second radius (r1) is larger than the first radius (r0). The surface of thesecond shank segment 312 is further formed with at least one projectingelement 38 between two neighboring interconnected ones of thethread sections 34 that are proximate to thetapered insert part 32. The projectingelement 38 has a greatest radial dimension (r2) with respect to the shank axis (A) that is greater than the first radius (r0) and less than the second radius (r1). - In this embodiment, the surface of the
second shank segment 312 between the two neighboring interconnected ones of thethread sections 34 is provided with a pair of theprojecting elements 38 that are diametrically opposite relative to the shank axis (A). Preferably, each projectingelement 38 is formed as a plate that projects radially relative to the shank-axis (A) and that has a convex shavingedge 380. The projectingelements 38 serve to enlarge the periphery of the hole formed by thetapered insert part 32 such that the torque necessary to drive thewood screw 3 into a wooden object is accordingly reduced. This low torque requirement also prevents the formation of cracks in the wooden object during the screw driving operation. - FIG. 5 illustrates a second preferred embodiment of the
wood screw 3′ according to the present invention. Unlike the previous embodiment, the two neighboring interconnected ones of thethread sections 341 on the surface of thesecond shank segment 312 have a third radius (r3) relative to the shank axis (A). The remaining ones of thethread sections 34 on the surface of thesecond shank segment 312 have the second radius (r1) relative to the shank axis (A). The third radius (r3) is greater than the first radius (r0) of thefirst shank segment 311 and is less than the second radius (r1). Moreover, the third radius (r3) is not less than the greatest radial dimension (r2) of theprojecting elements 38. - Referring to Table 1, a driving torque test was performed to compare the driving torque requirements of a
conventional wood screw 1 and awood screw 3′ of the present invention having the same dimensions.TABLE 1 Driving torque test Driving torque Average Test sample (Kg · f · cm) (Kg · f · cm) Conventional 31.8 38.9 35.35 Wood screw 1Wood screw 3 of the19.6 20.9 20.25 present invention - As evident from Table 1, the driving torque required for the
wood screw 3′ of the present invention is about 40% less as compared to theconventional wood screw 1. - Referring to FIG. 6, in a third preferred embodiment of the
wood screw 4 according to this invention, each projectingelement 48 is formed as a rib that extends parallel to the shank axis (A). In this embodiment, each projectingelement 48 has a rounded cross-section along a plane transverse to the shank axis (A) (see FIG. 7). - Referring to FIG. 8, in a fourth preferred embodiment of the
wood screw 5 according to this invention, each projectingelement 58 has a triangular or tapering cross-section along a plane transverse to the shank axis. - Referring to FIG. 9, in a fifth preferred embodiment of the
wood screw 6 according to this invention, each projectingelement 68 has a generally trapezium cross-section along a plane transverse to the shank axis. - By virtue of the configurations of the projecting elements, the wood screw of the present invention can be manufactured at a relatively low cost and fastened into a wooden object with a relatively low driving torque requirement and without reducing the holding effect between the wood screw and the wooden object. The object of the present invention is thus met.
- While the present invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretations and equivalent arrangements.
Claims (10)
1. A screw comprising a head part, a tapered insert part and a shank part disposed between said head part and said tapered insert part and having a shank axis, said shank part having a first shank segment adjacent to said head part and a second shank segment adjacent to said tapered insert part, said first shank segment having a first radius relative to the shank axis, said second shank segment having a surface that is formed with a screw thread, said screw thread including interconnected thread sections that have a second radius relative to the shank axis and larger than the first radius, said surface of said second shank segment being further formed with at least one projecting element between two neighboring interconnected ones of said thread sections that are proximate to said tapered insert part, said projecting element having a greatest radial dimension with respect to the shank axis that is greater than the first radius and less than the second radius.
2. The screw of claim 1 , wherein all of said thread sections on said surface of said second shank segment have the second radius relative to the shank axis.
3. The screw of claim 1 , wherein said two neighboring interconnected ones of said thread sections on said surface of said second shank segment have a third radius relative to the shank axis that is greater than the first radius and less than the second radius, and remaining ones of said thread sections on said surface of said second shank segment have the second radius relative to the shank axis.
4. The screw of claim 3 , wherein the third radius is not less than the greatest radial dimension of said projecting element.
5. The screw of claim 1 , wherein said surface of said second shank segment between said two neighboring interconnected ones of said thread sections is provided with a pair of said projecting elements that are diametrically opposite relative to the shank axis.
6. The screw of claim 1 , wherein said projecting element is formed as a plate that projects radially relative to the shank axis and that has a convex shaving edge.
7. The screw of claim 1 , wherein said projecting element is formed as a rib that extends parallel to the shank axis.
8. The screw of claim 7 , wherein said projecting element has a rounded cross-section along a plane transverse to the shank axis.
9. The screw of claim 7 , wherein said projecting element has a tapering cross-section along a plane transverse to the shank axis.
10. The screw of claim 7 , wherein said projecting element has a generally trapezium cross-section along a plane transverse to the shank axis.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW091209034U TW539066U (en) | 2002-06-17 | 2002-06-17 | Wooden screw with low twisting torque |
TW091209034 | 2002-06-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20030231940A1 true US20030231940A1 (en) | 2003-12-18 |
US6672812B1 US6672812B1 (en) | 2004-01-06 |
Family
ID=29547329
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/261,924 Expired - Fee Related US6672812B1 (en) | 2002-06-17 | 2002-09-30 | Wood screw with different shank radii |
Country Status (2)
Country | Link |
---|---|
US (1) | US6672812B1 (en) |
TW (1) | TW539066U (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012098139A1 (en) * | 2011-01-21 | 2012-07-26 | Swg Schraubenwerk Gaisbach Gmbh | Particleboard screw |
EP3392513A1 (en) * | 2017-04-18 | 2018-10-24 | Adolf Würth GmbH & Co. KG | Wood screw with curved supernatant between thread passages |
USD885874S1 (en) * | 2018-08-01 | 2020-06-02 | Integral Building Products Incorporation | Screw |
EP3379092B1 (en) * | 2017-03-20 | 2020-11-11 | Fushang Co., Ltd. | Screw with cutting teeth |
USD908476S1 (en) * | 2016-12-20 | 2021-01-26 | Avvio Gmbh & Co Kg | Screw |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005163834A (en) * | 2003-11-28 | 2005-06-23 | Yamaha Corp | Screw member, and connector using the same |
SE529577C2 (en) * | 2005-12-22 | 2007-09-25 | Essve Produkter Ab | Screw |
DE202006000479U1 (en) * | 2006-01-12 | 2006-03-16 | Abc Verbindungstechnik Gmbh & Co. Kg | Self-piercing and thread-forming screw |
TWM466982U (en) * | 2013-05-30 | 2013-12-01 | Shuenn Chang Fa Entpr Co Ltd | Screw |
DE102016203864A1 (en) * | 2016-03-09 | 2017-09-14 | Schmid Schrauben Hainfeld Gmbh | screw |
JP2018144701A (en) * | 2017-03-07 | 2018-09-20 | 株式会社ジェイテクト | Rack guide device |
TWM598349U (en) * | 2020-03-05 | 2020-07-11 | 緯紘精密工業股份有限公司 | Arc spiral screw |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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DE253960C (en) * | ||||
US2263137A (en) * | 1940-03-02 | 1941-11-18 | Parker Kalon Corp | Fastener device |
US2371365A (en) * | 1942-12-07 | 1945-03-13 | American Screw Co | Locking screw and method of making |
JPS5597513A (en) * | 1979-01-17 | 1980-07-24 | Topura Kk | Selffdrilling screw |
JPH041371Y2 (en) | 1987-02-16 | 1992-01-17 | ||
CA1288980C (en) * | 1987-06-19 | 1991-09-17 | Seiichiro Takasaki | Tapping screw |
GB8721048D0 (en) * | 1987-09-08 | 1987-10-14 | Itw Ltd | Screw threaded fastener |
JPH0716090Y2 (en) * | 1989-09-12 | 1995-04-12 | 山喜産業株式会社 | Tapping screw |
DE19532874A1 (en) * | 1995-09-06 | 1997-03-13 | Az Ausruest Zubehoer Gmbh | Thread forming connector |
-
2002
- 2002-06-17 TW TW091209034U patent/TW539066U/en unknown
- 2002-09-30 US US10/261,924 patent/US6672812B1/en not_active Expired - Fee Related
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012098139A1 (en) * | 2011-01-21 | 2012-07-26 | Swg Schraubenwerk Gaisbach Gmbh | Particleboard screw |
EP2665941B1 (en) | 2011-01-21 | 2016-04-27 | SWG Schraubenwerk Gaisbach GmbH | Particleboard screw |
USD908476S1 (en) * | 2016-12-20 | 2021-01-26 | Avvio Gmbh & Co Kg | Screw |
EP3379092B1 (en) * | 2017-03-20 | 2020-11-11 | Fushang Co., Ltd. | Screw with cutting teeth |
EP3392513A1 (en) * | 2017-04-18 | 2018-10-24 | Adolf Würth GmbH & Co. KG | Wood screw with curved supernatant between thread passages |
TWI689668B (en) * | 2017-04-18 | 2020-04-01 | 瑞士商伍爾特國際股份有限公司 | Wood screw having an arc-shaped protrusion between thread turns and the use and manufacturing methods thereof |
EP3640487A1 (en) * | 2017-04-18 | 2020-04-22 | Adolf Würth GmbH & Co. KG | Wood screw with curved supernatant between thread passages |
US10859107B2 (en) | 2017-04-18 | 2020-12-08 | Würth International Ag | Wood screw having a crescent-shaped protrusion between thread turns |
USD885874S1 (en) * | 2018-08-01 | 2020-06-02 | Integral Building Products Incorporation | Screw |
Also Published As
Publication number | Publication date |
---|---|
US6672812B1 (en) | 2004-01-06 |
TW539066U (en) | 2003-06-21 |
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