200936897 九、發明說明： 【發明所屬之技術領域】 本發明係為-種自攻螺栓，尤指__種可提高鑽頭之切口應 力’避免切口磨損頓化’並可降低切口延伸面與物件之接觸面 積，使攻切過程更為順利之自攻螺栓。 【先前技術】 如第—、二圖所示，習用之自攻螺栓1G，主要係於一螺桿 © 1卜端設有一頭部12’另—端設有一鑽頭13所構成；使用時， 可藉由鑽頭13之切削刃131於物件上先攻切—圓孔，然後藉由 螺桿11疑鎖於物件上，以達到方便螺鎖之目的。 上述習用自攻螺栓10 ,雖然可藉由鑽頭13達到方便螺鎖之 —目的；惟，由於該鑽頭13之切削刃13i係成一直線之平口狀， 因此該_刃131絲易磨_化，且由於細π延伸面132 亦成平整面’因此在攻切時該切口延伸自將會與物件形 ❹成面之接觸磨擦產生阻力，而造成攻切過程之不順，同時亦會 因回速疑轉練產生高溫，而造成切肖㈤31加速磨損頓化者。 【發明内容】 、 _ 本^月之目的’即在於改善上述習用自攻螺栓所存在之缺 失，提供-種可提高鐵頭之切口應力，避免切口磨損頓化，並 餅低切口延伸面與物件之_面積，使攻切過程更為順利之 200936897 日為達到上述目的，本發明之自攻螺栓，包含有—螺桿，螺 扣一端形成-頭部，螺桿另一端形成一鑽頭，該綱具有兩對 稱之切口及切口延伸面；其特徵乃在於： 該切口上形成有若干道浮凸之圓弧狀切齒，該切齒並以漸收欽 狀浮凸延伸至切口延伸面表面者； .藉由上述構造’利用在切.口及切口延伸面上形成若干道浮凸之 切齒設置’而提供-種可提高_之切口應力，避免切口磨損 頓化，並可降低切口延伸面與物件之接觸面積，使攻切過程更 為順利之自攻螺栓。 【實施方式】 冑關本發明為達到目的所運用之技術手段’紐再配合第 二圖至第四圖所示之實施彳列，詳細說明如下： 如第二、四圖所示，實施例中之自攻螺栓2〇，包含有一螺 桿21 ’螺桿21-卿成-頭部22，螺桿21另—端形成—鑽頭23， ® 該鑽頭23具有兩對稱之切口 231及切口延伸面232者。 惟，上述之構造乃與習用自攻螺栓大同小異，且由於並非 本發明為達到目的所運用之技術手段及其構造特徵所在，因此 恕於此不再進一步贅述；㊣，本發明之技術特徵乃在於·· 如第三、四圖所示，該切口231上形成有若干道浮凸之圓孤 狀切齒233，該切齒233並以漸收歛狀浮凸延伸至切口延伸面2犯 表面者；較佳之實施例是，該切齒233係成交錯狀分佈設置於兩 200936897 對稱之切口 231及切口延伸面232上者。 藉由上述之構造’利用該若干道切齒233浮凸於切口 231 及切口延伸面232上之設置，可提高切口 231之應力，避免切 口 231在攻切過程中磨損頓化，並可降低切口延伸面2兕與物 件之接觸面積，降低攻切過程中與物件之接觸磨擦產生阻力， •使攻切過程更為糊’同時亦可避免因高速旋轉磨擦產生高 狐’而可避免切口 231加速磨損頓化，進而可達到使攻切過程 ❽更為順利進行者。 由是’從以上所述及圖示所示之實施例可知，本發明確巧 藉由在切口 231及切口延伸面232上形成若干道浮凸之切齒战 設置，而提供-種可提高鑽頭23之切口 231應力，避免切口 23] 磨補化’並可降低切口延伸面挪與物件之接觸面積，使攻 切過程更為糊之自攻職；因此，本發_具錢著之進步 性，且其確為未曾有過，★成 ❹ 。付5备明專利之要件，爰依法提 出專利申Μ，並祈賜專利為禱，至感德便。 在於述’僅為本發明之可行實施例，該實施例主要僅 :於==明本發明為達到目的所運用之技術手 这因此並不此以之限定本發 明書及申請專利顧所為之等效’舉凡依本發明說 所涵蓋之保護範圍者。 < 或修飾’皆應仍屬本發明 【圖式簡單說明】 200936897 第一圖係習用自攻螺栓之立體圖。 第二圖係習用自攻螺;f全之侧視構造示意圖 第三圖係本發明之立體圖。 第四圖係本發明之侧視構造示意圖。 【主要元件符號說明】 <習用> 10 自攻螺栓 ❹ 11 螺桿 、 12 頭部 13 鑽頭 131 切口 132切口延伸面 <本發明> 20 自攻螺栓 21 螺桿 ' 22 頭部 23 鑽頭 231 切口 232切口延伸面 233切齒200936897 IX. INSTRUCTIONS: [Technical Field] The present invention is a self-tapping bolt, especially a __ type which can improve the notch stress of the drill bit, avoiding the wear of the slit, and can reduce the extension surface of the slit and the object. Self-tapping bolts that contact the area to make the cutting process smoother. [Prior Art] As shown in the first and second figures, the conventional self-tapping bolt 1G is mainly composed of a screw 12 with a head 12' at the other end and a drill bit 13 at the other end. The cutting edge 131 of the drill bit 13 is first tapped on the object to form a round hole, and then the screw 11 is suspected to be locked on the object to achieve the purpose of facilitating the screw lock. The above-mentioned conventional self-tapping bolt 10 can be easily screwed by the drill bit 13; however, since the cutting edge 13i of the drill bit 13 is in the shape of a straight line, the _blade 131 is easy to be grounded, and Since the thin π-extended surface 132 is also a flat surface, the slit extends from the contact friction with the surface of the object shape during the cutting, which causes the cutting process to be unsatisfactory and also causes a slow return. Practice to produce high temperatures, and cause the Xiao (5) 31 to accelerate the wear and tear. [Summary of the Invention], _ The purpose of this month is to improve the lack of the above-mentioned self-tapping bolts, to provide a kind of increase in the cutting stress of the iron head, to avoid the incision wear, and the low-cut extension surface and the object In order to achieve the above objectives, the self-tapping bolt of the present invention comprises a screw, one end of which forms a head, and the other end of the screw forms a drill bit. The symmetrical slit and the slit extending surface are characterized in that: the slit is formed with a plurality of embossed arc-shaped cutting teeth, and the cutting teeth extend to the surface of the slit extending surface by the gradual embossing; The construction 'utilizes a plurality of embossing teeth on the cutting surface and the slit extending surface to provide a kind of cutting stress which can improve the notching, and can reduce the contact area between the slit extending surface and the object. Self-tapping bolts that make the cutting process smoother. [Embodiment] The technical means used in the present invention to achieve the purpose is to cooperate with the implementation diagrams shown in the second to fourth embodiments, and the details are as follows: As shown in the second and fourth figures, in the embodiment The self-tapping bolt 2〇 includes a screw 21 'screw 21-clear-head 22, and the other end of the screw 21 is formed with a drill bit 23, which has two symmetrical slits 231 and a slit extending surface 232. However, the above-mentioned structure is similar to the conventional self-tapping bolt, and since it is not the technical means and structural features of the present invention for achieving the purpose, it will not be further described herein; the technical feature of the present invention is that As shown in the third and fourth figures, the slit 231 is formed with a plurality of embossed circular orthographic teeth 233 which extend in a tapered shape to the surface of the slit extending surface 2; preferably. In the embodiment, the cutting teeth 233 are arranged in a staggered manner on the two symmetrical slits 231 and the slit extending faces 232 of 200936897. By the above configuration 'the use of the plurality of cutting teeth 233 to emboss on the slit 231 and the slit extending surface 232, the stress of the slit 231 can be increased, the slit 231 can be prevented from being worn during the cutting process, and the slit extension can be reduced. The contact area between the surface and the object reduces the contact friction with the object during the cutting process, and makes the cutting process more sloppy. It also avoids the high fox's high-speed rotary friction to avoid the accelerated wear of the slit 231. It will be able to achieve a smoother attack process. It can be seen from the above description and the illustrated embodiment that the present invention provides a plurality of embossing tangential warping arrangements on the slit 231 and the slit extending surface 232 to provide a drill bit 23 The incision 231 stress, to avoid the incision 23] grinding complement 'can reduce the contact area of the incision extension surface and the object, so that the attack process is more self-scoring; therefore, the hair is progressive with money, And it really has never been, ★ Cheng Yu. Pay 5 to specify the requirements of the patent, and file a patent application in accordance with the law, and pray for the patent as a prayer. It is to be understood that the present invention is only a possible embodiment of the present invention. The embodiment is mainly used only for the purpose of the present invention. Therefore, the present invention is not limited thereto, and thus the invention and the patent application are not limited thereto. The effect of the scope of protection covered by the invention. < or modification ‘ should still belong to the invention. [Simplified illustration] 200936897 The first picture is a perspective view of a self-tapping bolt. The second figure is a self-tapping snail; a schematic view of the side view of the whole figure. The third figure is a perspective view of the present invention. The fourth drawing is a schematic view of the side view of the present invention. [Main component symbol description] <conventional> 10 Self-tapping bolt ❹ 11 screw, 12 head 13 drill bit 131 slit 132 slit extension surface <present invention> 20 self-tapping bolt 21 screw '22 head 23 drill bit 231 slit 232 slit extension surface 233 incisor