• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A screw includes a cylindrical shank having an upper portion formed with spiral circular threads and a lower portion formed with spiral triangular threads, each of the spiral triangular threads having three budges having three sharp edges and three pointed tips, the pointed tips of the spiral triangular threads being located at different positions, the cylindrical shank having a pointed end at a lower portion thereof, whereby the screw can be easily and rapidly turned into a piece of hard wood.
    公开号:US20010005474A1
    申请号:US09/760,838
    申请日:2001-01-17
    公开日:2001-06-28
    发明作者:Chun-Chin Chen
    申请人:Chun Chen Screw Co Ltd；
    IPC主号:F16B25-0047
    专利说明:
    [0001] This is a continuation-in-part of U.S. patent application Ser. No. 09/451,712. [0001] BACKGROUND OF THE INVENTION
    [0002] 1. Field of the Invention [0002]
    [0003] This invention is related to an improvement in the structure of a screw and in particular to one which can be easily turned into a piece of hard wood. [0003]
    [0004] 2. Description of the Prior Art [0004]
    [0005] The conventional screw consists essentially of a solid cylinder, usually of metal, around which a thread winds spirally, either clockwise or counterclockwise. However, it is difficult to turn the screw into an object if it is made of hard wood. Hence, an improved screw as shown in UK Patent No. 2040769 (see FIGS. 1A, 1B, 1C, 1D and 1E) has been designed to obviate this drawback. As shown, the screw includes a triangular shank 1 formed with spiral triangular threads 11. The shank 1 is first processed into one with a triangular cross section and then cut with spiral threads 11. U.S. Pat. No. 5,044,855 (see FIGS. 2 and 2A) also discloses a screw 2 with a triangular shank with a smaller diameter at the lower end and formed with spiral triangular threads 21. However, although the spiral triangular threads 21 can facilitate the turning of the screw into the wood, it still requires a lot of effort to turn the screw because of the resistance produced by the rotation of the triangular shank in the wood thereby often making one feel utterly exhausted in order to fasten pieces of hard wood. [0005]
    [0006] Therefore, it is an object of the present invention to provide an improvement in the structure of a screw which can obviate and mitigate the above-mentioned drawbacks. [0006] SUMMARY OF THE INVENTION
    [0007] This invention is related to an improvement in the structure of a screw. [0007]
    [0008] According to a preferred embodiment of the present invention, a screw includes a cylindrical shank having an upper portion formed with spiral circular threads and a lower portion formed with spiral triangular threads, each of the spiral triangular threads having three budges having three sharp edges and three pointed tips, the pointed tips of the spiral triangular threads being located at different positions, the cylindrical shank having a pointed end at a lower portion thereof. [0008]
    [0009] It is the primary object of the present invention to provide an improved screw which can be easily turned into a piece of hard wood. [0009]
    [0010] It is another object of the present invention to provide an improved screw which is simple in construction. [0010]
    [0011] It is a further object of the present invention to provide an improved screw which is inexpensive to manufacture. [0011]
    [0012] The foregoing objects and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principle of the present invention is shown by way of illustrative example. [0012] BRIEF DESCRIPTION OF THE DRAWINGS
    [0013] FIG. 1A illustrates a prior art screw without threads; [0013]
    [0014] FIG. 1B is a cross sectional view of FIG. 1A; [0014]
    [0015] FIG. 1C illustrates the prior art screw with threads; [0015]
    [0016] FIG. 1D is a cross sectional view of FIG. 1C; [0016]
    [0017] FIG. 1E is a bottom view of the prior art screw; [0017]
    [0018] FIG. 2A illustrates a second prior art screw; [0018]
    [0019] FIG. 2B is a bottom view of the second prior art screw; [0019]
    [0020] FIG. 3 is a perspective view of the present invention; [0020]
    [0021] FIGS. 4A, 4B and [0021] 4C illustrate a second preferred embodiment of the present invention;
    [0022] FIG. 5 is a perspective view of a third preferred embodiment of the present invention; [0022]
    [0023] FIGS. 6A and 6B illustrate how to manufacture the present invention; [0023]
    [0024] FIGS. 7 and 8 illustrate the working principle of the present invention; and [0024]
    [0025] FIGS. 9 and 10 illustrate other preferred embodiments of the present invention. [0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
    [0026] For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings. Specific language will be used to describe same. It will, nevertheless, be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated herein being contemplated as would normally occur to one skilled in the art to which the invention relates. [0026]
    [0027] With reference to the drawings and in particular to FIG. 3 thereof, the screw according to the present invention comprises a cylindrical shank [0027] 3 formed with spiral circular threads 31 at the upper portion and spiral triangular threads 32 at the lower portion. The cylindrical shank 3 has a pointed end at a lower portion thereof. Each of the spiral triangular threads 32 has three bulges 33 each having a sharp edge and pointed tips 321. Between every two of the bulges 33 there is a ridge 331. The spiral triangular threads 32 are arranged so that the pointed tips 321 of each of the spiral triangular threads 32 are located at different positions. Hence, when the screw is turned into a piece of hard wood, the pointed tips 321 and the sharp edge of the spiral triangular threads 33 will first make a cut into the hard wood and then the bulges 33 will enlarge the cut by force thereby making it easier for the screw to turn into the hard wood.
    [0028] As shown in FIGS. 4A, 4B and [0028] 4C, the pointed tips 321 of the spiral triangular threads 32 may be arranged in alignment as required. As the screw is turned into a piece of wood, the pointed tips 321 of the triangular threads 32 of the screw 2 will cut the wood and the bulge 33 will enlarge the cut to facilitate the turning of the screw into the wood. In addition, the triangular threads 32 may be arranged in different positions as shown in FIG. 5.
    [0029] Referring to FIGS. 6A and 6B, the present invention is simply made by cutting a cylindrical embryo [0029] 4 into a cylindrical shank 3 with triangular spiral threads 32 with pointed tips 321. The manufacturing method is very simple and low in cost.
    [0030] FIGS. 7 and 8 illustrate the working principle of the present invention. As shown, when the screw [0030] 3 is turned into a piece of wood 5, the pointed tips 321 of the triangular threads 32 will make a cut in the wood 3 and then the bulge 33 will enlarge the cut by force thereby reducing the friction between the screw 2 and the wood 3. Then, a spiral passage will be formed as soon as the pointed tips 321 of the triangular threads 32 are turned into the wood 5 so that the circular threads 21 can be easily turned into the wood 5 along the spiral passage.
    [0031] It will be understood that the threads may be of other shapes such as pentagons [0031] 34 (see FIG. 9) arranged in alignment or different positions (see FIG. 10), and each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.
    [0032] While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention. [0032]
    权利要求:
    Claims (3)
    [1" id="US-20010005474-A1-CLM-00001] 1. A screw comprising a cylindrical shank having an upper portion formed with spiral circular threads and a lower portion formed with spiral triangular threads, each of said spiral triangular threads having three budges having three sharp edges and three pointed tips, said pointed tips of said spiral triangular threads being located at different positions, said cylindrical shank having a pointed end at a lower portion thereof.
    [2" id="US-20010005474-A1-CLM-00002] 2. The screw as claimed in
    claim 1 , wherein said spiral triangular threads are replaceable with spiral polygonal threads arranged in alignment or in different positions.
    [3" id="US-20010005474-A1-CLM-00003] 3. The screw as claimed in
    claim 1 , wherein said spiral triangular threads are formed from a cylindrical embryo.
    类似技术:
    公开号 | 公开日 | 专利标题
    US6254327B1|2001-07-03|Screw with spiral triangular threads
    US6468014B2|2002-10-22|Screw with spiral triangular threads
    US5897280A|1999-04-27|Self perforating and thread forming connecting element
    CN101360922B|2010-08-25|Self-tapping and thread-forming screw
    US5356253A|1994-10-18|Sheet metal screw
    AU2004200203B2|2005-12-15|Screw anchor for friable material
    US5516248A|1996-05-14|Low torque wood screw
    AU678933B2|1997-06-12|Wall anchor accommodating fasteners of varying thread diameters
    KR950013670A|1995-06-15|Stone drills with hard metal punching heads
    US9494179B2|2016-11-15|Schraubelement—screw element
    US20060147295A1|2006-07-06|Screw with two types of threads
    US6273656B1|2001-08-14|Push pin fastener
    US6402448B1|2002-06-11|Self-drilling and self-tapping screw
    US4161132A|1979-07-17|Self-tapping screw
    US327296A|1885-09-29|William t
    US4222689A|1980-09-16|Drilling and tapping screw
    US5074729A|1991-12-24|Drill screw having cutting edges each forming an arc curving to a head side
    US6390400B1|2002-05-21|Blade of paper shredder
    CA1110092A|1981-10-06|Entering end portion of drill screw
    EP0373223B1|1996-04-24|Bolting device
    JP4661283B2|2011-03-30|How to attach a weight to a movable member
    US11125262B2|2021-09-21|Thread forming and thread locking fastener
    JP6301537B1|2018-03-28|Screw extraction tool
    EP1158186A1|2001-11-28|Polygonal rivet with an internal threading
    TH29567B|1998-08-14|Male screw piece
    同族专利:
    公开号 | 公开日
    US6468014B2|2002-10-22|
    GB0101153D0|2001-02-28|
    AU733414B3|2001-05-10|
    FR2820471B3|2003-01-03|
    GB2371343A|2002-07-24|
    FR2820471A3|2002-08-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20070071576A1|2005-09-29|2007-03-29|Romano Mark J|Hybrid screw for composite lumber and wood|
    WO2007036081A1|2005-09-28|2007-04-05|AironwareCo., Ltd.|Self-tapping screw|
    US11204055B2|2017-08-31|2021-12-21|The Hillman Group, Inc.|Sheet metal screw|GB957675A|1959-06-09|1964-05-13|Res Eng & Mfg|Self-tapping screws|
    US3104161A|1960-07-05|1963-09-17|Textron Ind Inc|Metal blank with extruded portion of non-circular cross section|
    US3683437A|1971-08-26|1972-08-15|Eugene R Larson|Method of making a self-thread forming fastener with easy thread pickup|
    US4069730A|1976-06-03|1978-01-24|Wales-Beech Corporation|Thread-forming screw|
    US4259889A|1979-08-22|1981-04-07|The Lamson & Sessions Co.|Thread tapping form|
    JPS6253728B2|1980-12-26|1987-11-11|Nitsusan Jidosha Kk||
    GB8819820D0|1988-08-20|1988-09-21|Tucker Fasteners Ltd|Anchors for fixing to dense concrete masonry &c|
    US5044855A|1990-08-31|1991-09-03|Nitto Seiko Co., Ltd.|Thread-forming fasteners|
    US5795120A|1996-05-13|1998-08-18|Hurdle; Donald R.|Reduced-friction thread forming or thread cutting screw|
    FR2784722A1|1998-10-19|2000-04-21|Vynex Sa|Self tapping wood screw with milled head for cutting a countersunk hole in hard material to accommodate the head|US7326014B2|2004-04-21|2008-02-05|Illinois Tool Works, Inc|Interactive fit screw thread|
    TWM294585U|2006-01-09|2006-07-21|Easylink Ind Co Ltd|Screw structure|
    US20080095594A1|2006-10-24|2008-04-24|Ching-Guei Lin|Screw|
    US7963732B2|2008-04-24|2011-06-21|Triangle Fastener Corporation|Threaded fastener|
    US9433454B2|2013-03-14|2016-09-06|Amei Technologies, Inc.|Variable angle screws, plates and systems|
    US8926249B2|2013-04-19|2015-01-06|Fushang Co., Ltd.|Screw|
    DE102013106758A1|2013-06-27|2014-12-31|Aesculap Aktiengesellschaft|Unround pedicle screw|
    DE102018008291A1|2018-01-04|2019-07-04|Petra Bernard-Schöpf|Fastening element with polygonal external thread, process for its production and composite element and its use|
    US11199214B2|2019-09-20|2021-12-14|Essence Method Refine Co., Ltd.|Quick fastening screw|
    法律状态:
    2001-01-17| AS| Assignment|Owner name: CHUN CHEN SCREW CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHEN, CHUN-CHIN;REEL/FRAME:011464/0403 Effective date: 20010112 |
    2006-05-10| REMI| Maintenance fee reminder mailed|
    2006-10-23| LAPS| Lapse for failure to pay maintenance fees|
    2006-11-22| STCH| Information on status: patent discontinuation|Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
    2006-12-19| FP| Lapsed due to failure to pay maintenance fee|Effective date: 20061022 |
    优先权:
    申请号 | 申请日 | 专利标题
    US09/451,712|US6254327B1|1999-12-01|1999-12-01|Screw with spiral triangular threads|
    GB0101153A|GB2371343A|2001-01-17|2001-01-17|Screw having triangular or polygonal thread turns|
    US09/760,838|US6468014B2|1999-12-01|2001-01-17|Screw with spiral triangular threads|
    FR0101395A|FR2820471B3|2001-01-17|2001-02-02|IMPROVEMENT TO THE STRUCTURE OF A SCREW|
    AU24844/01A|AU733414B3|2001-01-17|2001-03-02|Improvement in the structure of a screw|GB0101153A| GB2371343A|2001-01-17|2001-01-17|Screw having triangular or polygonal thread turns|
    US09/760,838| US6468014B2|1999-12-01|2001-01-17|Screw with spiral triangular threads|
    FR0101395A| FR2820471B3|2001-01-17|2001-02-02|IMPROVEMENT TO THE STRUCTURE OF A SCREW|
    AU24844/01A| AU733414B3|2001-01-17|2001-03-02|Improvement in the structure of a screw|
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