TW202111225A - Self-tapping screw for achieving the effects of preventing cracks and maintaining the anti-pulling ability - Google Patents

Self-tapping screw for achieving the effects of preventing cracks and maintaining the anti-pulling ability Download PDF

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TW202111225A
TW202111225A TW108131692A TW108131692A TW202111225A TW 202111225 A TW202111225 A TW 202111225A TW 108131692 A TW108131692 A TW 108131692A TW 108131692 A TW108131692 A TW 108131692A TW 202111225 A TW202111225 A TW 202111225A
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screw
tapping
self
shaft member
tooth
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TW108131692A
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TWI744688B (en
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顏邦修
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聚亨企業股份有限公司
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Abstract

A self-tapping screw includes a screw head, a screw rod extending from the screw head along an axis, a tapping unit extending spirally around the screw rod, and a fixing assistance unit. The tapping unit includes a plurality of cutting edges radially tapered and extended outward from the screw rod and continuously connected to each other. The fixing assistance unit includes a plurality of crest members which are spaced apart from each other, axially arranged on adjacent cutting edges, and radially tapered and extended outward; and a plurality of concave surfaces which are respectively adjacent to the crest members and recessed in the screw rod so as to define a plurality of mortise grooves radially recessed inward. By means of the crest members, the uncut part is correspondingly pushed away during the tapping process without causing severe shear changes and damages. After the crest members passes, the uncut part rebounds correspondingly and is mortised into the mortise groove, so as to achieve the effects of preventing cracks and maintaining the anti-pulling ability.

Description

自攻螺絲Self-tapping screws

本發明是有關於一種工件,特別是指一種自攻螺絲。The present invention relates to a kind of workpiece, in particular to a self-tapping screw.

參閱圖1,市面上常見之一自攻螺絲,包含一螺頭5、一由該螺頭5沿一軸線Y延伸且末端呈尖銳狀的螺桿6,及一軸向圍繞該螺桿6而呈螺旋延伸狀的攻牙單元7。該螺頭5包括一適用於供一驅動工具可脫離地卡設的起子槽51;該螺桿6包括一軸向延伸的桿身件61,及一由該桿身件61遠離於該螺頭5之一端漸縮延伸的鑽頭件62;該攻牙單元7則包括多個彼此連續地連接且由該螺桿6徑向往外漸縮延伸而截面呈三角形的切削刃71。Referring to Fig. 1, a common self-tapping screw on the market includes a screw head 5, a screw 6 extending from the screw head 5 along an axis Y and a sharp end, and an axially spiraling screw around the screw 6 Extension tapping unit 7. The screw head 5 includes a screwdriver slot 51 suitable for detachably clamping a driving tool; the screw 6 includes a shaft member 61 extending axially, and a shaft member 61 away from the screw head 5 One end of the drill piece 62 is tapered and extended; the tapping unit 7 includes a plurality of cutting edges 71 that are continuously connected to each other and extend radially outward from the screw rod 6 to form a triangular cross-section.

參閱圖2、圖3,在現行的攻牙作業中,當該螺頭5被該驅動工具卡設並驅動而圍繞該軸線Y旋轉時,將帶動該螺桿6一同旋轉,一待攻牙木板W將首先被該鑽頭件62鑽破,並被該等切削刃71逐一進入並螺旋切削而形成一與該攻牙單元7對應的螺接槽A。2 and 3, in the current tapping operation, when the screw head 5 is clamped and driven by the driving tool to rotate around the axis Y, the screw 6 will be driven to rotate together, and a wood board W to be tapped It will be first drilled by the drill piece 62, and then entered by the cutting edges 71 one by one and spirally cut to form a threaded groove A corresponding to the tapping unit 7.

雖然該自攻螺絲確實能藉由該攻牙單元7切削並卡接於對應之該螺接槽A,而螺接於該待攻牙木板W。但是在實際作業中發現該等切削刃71的頂緣與該桿身件61之徑向高度差距較大,在切削時該待攻牙木板W常因為受到劇烈的剪力變化而如圖2所示地破裂,導致該螺接槽A的結構強度減少而使螺接的強度降低,更甚者,還可能造成該待攻牙木板W的崩裂損壞,而無法進行螺接的作業。Although the self-tapping screw can indeed be cut by the tapping unit 7 and clamped to the corresponding screw groove A, and screwed to the wood board W to be tapped. However, in actual operation, it is found that the top edge of the cutting edge 71 and the shaft member 61 have a large radial height difference. The wood board W to be tapped is often subjected to severe shear changes during cutting, as shown in FIG. 2 The indication rupture results in the reduction of the structural strength of the screw groove A and the decrease of the screw connection strength. What's more, it may also cause the chipping and damage of the wood board W to be tapped, and the screw connection operation cannot be performed.

有鑑於上述問題,倘若為了防止該待攻牙木板W破裂,選擇該等切削刃71之頂緣徑向高度差距較小的自攻螺絲,又將會使切削出的螺接槽A深度降低,一樣會導致螺接的強度下降。此外,也因為該攻牙單元7與該螺接槽A相互卡接的強度不足,當該螺頭5被施加一軸向的拉力,該攻牙單元7將直接軸向脫離該螺接槽A,也就是產生了相關業界中所謂抗拉拔能力不足的缺點。In view of the above-mentioned problems, if in order to prevent the wood board W to be tapped from cracking, a self-tapping screw with a smaller radial height difference between the top edges of the cutting edges 71 is selected, and the depth of the threaded groove A will be reduced. The same will cause the strength of the screw connection to decrease. In addition, because the strength of the engagement between the tapping unit 7 and the threaded groove A is insufficient, when the screw head 5 is subjected to an axial pulling force, the tapping unit 7 will be directly separated from the threaded groove A in the axial direction. , Which is the shortcoming of the so-called insufficient pull-out resistance in the related industry.

因此,本發明之目的,即在提供一種保持良好抗拉拔能力且不會造成待攻物件產生損傷的自攻螺絲。Therefore, the purpose of the present invention is to provide a self-tapping screw that maintains good pull-out resistance and does not cause damage to the object to be tapped.

於是,本發明自攻螺絲,包含一螺頭、一由該螺頭沿一軸線延伸的螺桿、一軸向圍繞該螺桿而呈螺旋延伸狀的攻牙單元,及一設置於該螺桿上的協固單元。Therefore, the self-tapping screw of the present invention includes a screw head, a screw rod extending from the screw head along an axis, a tapping unit extending spirally around the screw shaft in the axial direction, and a cooperating screw provided on the screw head.固unit.

該螺頭包括一界定出一適用於供一驅動工具可脫離地卡設之起子槽的本體。The screw head includes a body defining a screwdriver slot suitable for detachably clamping a driving tool.

該螺桿包括一由該螺頭沿該軸線延伸的桿身件,及一由該桿身件遠離於該螺頭之一端漸縮延伸的鑽頭件。The screw includes a shaft member extending from the screw head along the axis, and a drill bit member extending from one end of the shaft member away from the screw head.

該攻牙單元包括多個由該螺桿徑向往外漸縮延伸且彼此連續地連接的切削刃。The tapping unit includes a plurality of cutting edges extending radially outward from the screw rod and continuously connected to each other.

該協固單元則包括多個彼此相間隔地沿軸向設置於相鄰的切削刃且徑向往外漸縮延伸的牙鋒件,及多個分別鄰近於該等牙鋒件並凹設於該螺桿而界定出多個徑向往內凹設之榫接槽的凹面。The cohesive unit includes a plurality of tooth tips which are arranged at adjacent cutting edges in an axial direction at intervals and extend radially outward, and a plurality of tooth tips are respectively adjacent to the tooth tips and recessed in the The screw defines a plurality of concave surfaces of the tenon grooves recessed radially inward.

本發明之功效在於:藉由該等彼此相間隔地設置於該等切削刃間的牙鋒件,及該等分別鄰近該等牙鋒件的凹面,使得每一切削刃進入並螺旋切削該待攻物件時,鄰近而未被切削的部分將順勢被鄰近且徑向高度相近之該牙鋒件進一步推離,而不會因為該牙鋒件與該桿身件的徑向高度落差所產生的劇烈剪力變化而受損。待該牙鋒件通過後,鄰近而未被切削的部分也將順勢回彈並嵌入該榫接槽而榫接,達成防止不可預期地裂損,還能夠保持良好抗拉拔能力的效果。The effect of the present invention is that by the cutting edges spaced apart between the cutting edges, and the concave surfaces adjacent to the cutting edges, each cutting edge enters and spirally cuts the cutting edge. When attacking an object, the adjacent but uncut part will be further pushed away by the adjacent and similar radial height of the front part, and will not be caused by the radial height difference between the front part and the shaft part. Damaged by severe shear changes. After the tooth tip passes through, the adjacent but uncut part will also rebound homeopathically and be inserted into the mortise groove to be mortise joint, so as to prevent unpredictable cracks and maintain good pull-out resistance.

參閱圖4~6,本發明自攻螺絲之一實施例,包含一螺頭1、一由該螺頭1沿一軸線C延伸的螺桿2、一軸向圍繞該螺桿2而呈螺旋延伸狀的攻牙單元3,及一設置於該螺桿2上的協固單元4。Referring to Figures 4 to 6, an embodiment of the self-tapping screw of the present invention includes a screw head 1, a screw rod extending from the screw head 1 along an axis C 2, an axially surrounding the screw rod 2 in a spirally extending shape The tapping unit 3, and a co-fixing unit 4 arranged on the screw 2.

該螺頭1包括一界定出一適用於供一驅動工具可脫離地卡設之起子槽11的本體12。雖然圖1上描繪之該起子槽11是適用於六角螺絲起子,但實際上該起子槽11可依據市面上常見的驅動工具進行改變,例如一字、十字,或是米字等,只要能夠供該螺絲起子卡設並被驅動而圍繞該軸線C旋轉,即可提升適用性以及並達成其功能。The screw head 1 includes a body 12 defining a screwdriver slot 11 suitable for detachably clamping a driving tool. Although the screwdriver slot 11 depicted in FIG. 1 is suitable for a hexagonal screwdriver, in fact the screwdriver slot 11 can be changed according to common driving tools on the market, such as a character, a cross, or a rice character, etc., as long as it can provide The screwdriver is clamped and driven to rotate around the axis C, which can improve the applicability and achieve its function.

該螺桿2包括一由該螺頭1沿該軸線C延伸的桿身件21,及一由該桿身件21遠離於該螺頭1之一端漸縮延伸的鑽頭件22。The screw 2 includes a shaft member 21 extending from the screw head 1 along the axis C, and a drill member 22 extending from one end of the shaft member 21 away from the screw head 1.

該攻牙單元3包括多個由該螺桿2徑向往外漸縮延伸且彼此連續地連接的切削刃31。實務上來說,該攻牙單元3即為熟知的螺牙,為了方便說明,該等切削刃31以通過位於該螺桿2之一側且平行該軸線C之一參考線R區分,也就是說,以下說明之每一切削刃31即是指通過該參考線R並圍繞該螺桿2一圈為準。另外,為了提供接下來將描述的該協固單元4設置,每一切削刃31之彼此間隔距離以寬間距為較佳。The tapping unit 3 includes a plurality of cutting edges 31 that extend radially outward from the screw 2 and are continuously connected to each other. In practice, the tapping unit 3 is a well-known thread. For the convenience of description, the cutting edges 31 are distinguished by a reference line R located on one side of the screw 2 and parallel to the axis C, that is, Each cutting edge 31 described below means that it passes through the reference line R and surrounds the screw 2 once. In addition, in order to provide the configuration of the co-fixing unit 4 which will be described next, the spacing distance between each cutting edge 31 is preferably a wide spacing.

參閱圖5~7,該協固單元4包括多個彼此相間隔地沿軸向設置於相鄰的切削刃31且徑向往外漸縮延伸的牙鋒件41,及多個分別鄰近於該等牙鋒件41並凹設於該螺桿2而界定出多個徑向往內凹設之榫接槽42的凹面43。其中,每一牙鋒件41均是呈一由鄰近該鑽頭件22之一側往鄰近該螺頭1之一側漸縮延伸的四面體,並具有一頂緣徑向往該軸線C延伸並與該凹面43相連的沉降區411、一位於該沉降區411另一側並適用於推抵一待攻物件I的推升區412,及二分別一體連接於該桿身件21及鄰近之該切削刃31的連接區413。準確地說,每一牙鋒件41之頂緣相對於該桿身件21之徑向距離D1大小為每一切削刃31之頂緣相對於該桿身件21之徑向距離D2大小的50%至70%,較佳為50%。而每一榫接槽42之底緣相對於該桿身件21之徑向距離D3大小為每一牙鋒件41之頂緣相對於該桿身件21之徑向距離D1大小的30%至50%。Referring to Figures 5-7, the co-fixing unit 4 includes a plurality of tooth tips 41 which are spaced apart from each other and axially arranged on the adjacent cutting edges 31 and extend radially outwardly, and a plurality of tooth tips 41 respectively adjacent to the The tooth blade 41 is recessed in the screw 2 to define a plurality of concave surfaces 43 of the tenon groove 42 recessed radially inward. Wherein, each tooth element 41 is a tetrahedron that tapers and extends from a side adjacent to the drill bit 22 to a side adjacent to the screw head 1, and has a top edge extending radially to the axis C and in line with The sinking area 411 connected to the concave surface 43, a pushing-up area 412 located on the other side of the sinking area 411 and suitable for pushing against an object I to be attacked, and two are respectively integrally connected to the shaft member 21 and the adjacent cutting The connecting area 413 of the blade 31. To be precise, the radial distance D1 between the top edge of each tooth 41 and the shaft 21 is 50 of the radial distance D2 between the top edge of each cutting edge 31 and the shaft 21. % To 70%, preferably 50%. The radial distance D3 between the bottom edge of each mortise groove 42 and the shaft member 21 is 30% to 30% of the radial distance D1 between the top edge of each tooth front member 41 and the shaft member 21 50%.

參閱圖6、圖7,並配合圖2、3,以下將說明使用該實施例相對於該待攻物件I進行攻牙的實際情形,使用者將該螺絲起子卡設於該起子槽11並圍繞該軸線C以順時針方向旋轉時,將帶動該桿身件21上的該攻牙單元3及該協固單元4及該鑽頭件22一同旋轉。該待攻物件I將先行被該鑽頭件22鑽出小孔,並被位於前端之該切削刃31攻牙而形成螺牙槽S,該待攻物件I之中鄰近該螺牙槽S而沒被攻牙的部分(以下定義為榫合部T)將會如圖7所示地被鄰近且徑向高度相近之該牙鋒件41的該推升區412進一步推離,而不會因為該牙鋒件41與該桿身件21的徑向高度落差,相對於該螺牙槽S及該榫合部T之間產生的劇烈剪力變化而受損。待該沉降區411通過後,該榫合部T也將順勢回彈並嵌入該榫接槽42。Referring to Figures 6 and 7, in conjunction with Figures 2 and 3, the actual situation of using this embodiment to tap the object to be tapped I will be described below. The user clamps the screwdriver in the screwdriver slot 11 and surrounds it. When the axis C rotates in a clockwise direction, the tapping unit 3 and the co-fixing unit 4 and the drill bit 22 on the shaft member 21 will rotate together. The object I to be tapped will first be drilled with a small hole by the drill piece 22, and tapped by the cutting edge 31 at the front end to form a screw socket S. The object I to be tapped is adjacent to the screw socket S but not The tapped part (defined as the tenon part T hereinafter) will be further pushed away by the push-up area 412 of the tooth front 41 that is adjacent and has a similar radial height as shown in FIG. The radial height difference between the tooth front member 41 and the shaft member 21 is damaged due to the severe change in the shear force generated between the screw socket S and the tenon part T. After the settlement area 411 passes, the tenon joint T will also rebound and fit into the tenon groove 42.

隨著該等切削刃31、該等牙鋒件41及該等凹面43逐一進入並連續地螺旋切削,該螺牙槽S將螺旋延伸並形成螺孔,該榫合部T則會因為該切削刃31與該等牙鋒件41之間的徑向距離小於該切削刃31與該桿身件21之間的徑向距離,而不會在切削過程中產生劇烈的剪力變化,進而避免如圖2所示之來自剪力變化產生的裂損。也因為該等牙鋒件41是彼此相間隔設置而不是完全覆蓋該桿身件21,而不會因為每一牙鋒件41的厚度,增加該桿身件21的直徑,導致了圖2所示地每一切削刃71的徑向距離較小而減少抗拉拔能力。As the cutting edges 31, the tooth elements 41 and the concave surfaces 43 enter one by one and continue to spirally cut, the thread groove S will spirally extend and form a screw hole, and the tenon part T will be cut due to the cutting The radial distance between the edge 31 and the tines 41 is smaller than the radial distance between the cutting edge 31 and the shaft member 21, and will not produce drastic changes in the shearing force during the cutting process, thereby avoiding such Figure 2 shows the cracks caused by changes in shear. It is also because the teeth 41 are spaced apart from each other instead of completely covering the shaft 21, and the thickness of each of the teeth 41 does not increase the diameter of the shaft 21, resulting in the result shown in FIG. 2 It shows that the radial distance of each cutting edge 71 is small, which reduces the pull-out resistance.

參閱圖8,有關抗拉拔能力,依照該實施例受到外力拉動的狀態,可區分為圍繞該軸線C逆時針方向旋轉的軸向旋出,或是直接沿該軸線C脫離該螺牙槽S。當該實施例被較為趨緩的力拉拔時,該實施例將傾向於順著該螺牙槽S圍繞該軸線C逆時針方向旋出,該等榫合部T將分別相對於該等沉降區411產生一反向的推抵力F,進而如圖8所示地阻止該實施例以逆時針方向旋出該待攻物件I,藉此提升該實施例的抗拉拔能力。Referring to Figure 8, regarding the pull-out resistance, according to the state of the embodiment being pulled by an external force, it can be classified as being screwed out in a counterclockwise direction around the axis C, or directly out of the screw socket S along the axis C. . When the embodiment is pulled out by a slower force, the embodiment will tend to be screwed out counterclockwise along the thread socket S around the axis C, and the tongue-and-groove portions T will respectively settle relative to the The area 411 generates a reverse pushing force F, thereby preventing the embodiment from rotating out the object I to be attacked in a counterclockwise direction as shown in FIG. 8, thereby improving the pull-out resistance of the embodiment.

另一方面,藉由該等凹面43所形成之榫接槽42,在該實施例被拉拔而軸向脫離該螺牙槽S時,回彈並嵌入該榫接槽42之該榫合部T將相對於該凹面43產生榫接作用,進一步加強相對於該等凹面43的頂抵力,也提升該實施例的抗拉拔能力。On the other hand, the mortise groove 42 formed by the concave surfaces 43, when the embodiment is pulled out of the thread groove S in the axial direction, it springs back and engages in the mortise groove 42 of the mortise groove 42 T will produce a tenoning effect with respect to the concave surface 43, further strengthen the pushing force with respect to the concave surface 43, and also improve the pull-out resistance of this embodiment.

最後,以上有關順時針旋入及逆時針旋出之施用狀況說明,是為了方便讀者了解,因此針對主流螺絲設計進行說明。但需要強調的是,該實施例亦可針對市面上因應不同用途而逆時針旋入、順時針旋出的反牙螺絲,進行該攻牙單元3螺旋方向的轉置、該牙鋒件41之該沉降區411及該推升區412的相反設置,以及改變該等凹面43的相對應位置,進而達成同樣的功效。Finally, the above description of the application status of clockwise screwing in and counterclockwise screwing out is for the convenience of readers to understand, so the main screw design is explained. However, it should be emphasized that this embodiment can also be used for counterclockwise screwing in and clockwise screwing out of counter-thread screws for different purposes on the market to perform the transposition of the tapping unit 3 in the spiral direction, and the threading element 41 The opposite arrangement of the settling zone 411 and the pushing up zone 412, and changing the corresponding positions of the concave surfaces 43 can achieve the same effect.

綜上所述,本發明自攻螺絲,在進行攻牙過程中,藉由該等牙鋒件41減少該等切削刃31與該桿身件21之間的徑向距離,進而減少因劇烈剪力變化所產生的裂損;並配合該等榫合部T分別相對於該等沉降區411產生阻止該實施例旋出的推抵力F;再藉由該等凹面43所形成之榫接槽42,與該等榫合部T相配合形成抵抗軸向脫離該螺牙槽S的榫接作用,提升該實施例的抗拉拔能力,故確實能達成本發明之目的。To sum up, the self-tapping screw of the present invention reduces the radial distance between the cutting edges 31 and the shaft member 21 by using the tooth blades 41 during the tapping process, thereby reducing severe shearing. The cracks caused by the force change; and cooperate with the tenon joints T to generate the thrust force F to prevent the embodiment from being unscrewed with respect to the settlement areas 411 respectively; and then the tenon grooves formed by the concave surfaces 43 42. Cooperating with the mortise parts T to form a mortise function that resists axial separation from the screw alveolar S, which improves the pull-out resistance of this embodiment, so it can indeed achieve the purpose of the invention.

惟以上所述者,僅為本發明之實施例而已,當不能以此限定本發明實施之範圍,凡是依本發明申請專利範圍及專利說明書內容所作之簡單的等效變化與修飾,皆仍屬本發明專利涵蓋之範圍內。However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

C:軸線 R:參考線 I:待攻物件 S:螺牙槽 T:榫合部 F:推抵力 D1:距離 D2:距離 D3:距離 1:螺頭 11:起子槽 12:本體 2:螺桿 21:桿身件 22:鑽頭件 3:攻牙單元 31:切削刃 4:協固單元 41:牙鋒件 411:沉降區 412:推升區 413:連接區 42:榫接槽 43:凹面 71:切削刃C: axis R: reference line I: Object to be attacked S: Thread socket T: Tenon joint F: Pushing force D1: distance D2: distance D3: distance 1: Screw head 11: Screwdriver slot 12: body 2: screw 21: Shaft 22: Drill bits 3: Tapping unit 31: cutting edge 4: Associated solid unit 41: Teeth 411: Settlement Zone 412: Push Up Zone 413: connection area 42: Tenon groove 43: concave 71: cutting edge

本發明之其他的特徵及功效,將於參照圖式的實施方式中清楚地呈現,其中: 圖1是一立體圖,說明現有之一自攻螺絲; 圖2是一示意圖,說明該自攻螺絲於攻牙過程中所產生的裂損; 圖3是一示意圖,說明該自攻螺絲抗拉拔能力不足; 圖4是一立體圖,說明本發明自攻螺絲之一實施例; 圖5是一示意圖,說明該實施例的實際施用情形; 圖6是一示意圖,說明該實施例的實際施用情形; 圖7是一示意圖,以另一角度說明該實施例的實際施用情形;及 圖8是一示意圖,說明該實施例抗拉拔的機制。Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a perspective view illustrating one of the existing self-tapping screws; Figure 2 is a schematic diagram illustrating the cracks generated during the tapping process of the self-tapping screw; Figure 3 is a schematic diagram illustrating that the self-tapping screw has insufficient pull-out resistance; Figure 4 is a perspective view illustrating an embodiment of the self-tapping screw of the present invention; Figure 5 is a schematic diagram illustrating the actual application of this embodiment; Figure 6 is a schematic diagram illustrating the actual application of this embodiment; Figure 7 is a schematic diagram illustrating the actual application of the embodiment from another perspective; and Fig. 8 is a schematic diagram illustrating the anti-pull mechanism of this embodiment.

1:螺頭1: Screw head

11:起子槽11: Screwdriver slot

12:本體12: body

2:螺桿2: screw

21:桿身件21: Shaft

22:鑽頭件22: Drill bits

3:攻牙單元3: Tapping unit

31:切削刃31: cutting edge

4:協固單元4: Associated solid unit

41:牙鋒件41: Teeth

Claims (6)

一種自攻螺絲,包含: 一螺頭,包括一界定出一適用於供一驅動工具可脫離地卡設之起子槽的本體; 一螺桿,包括一由該螺頭沿一軸線延伸的桿身件,及一由該桿身件遠離於該螺頭之一端漸縮延伸的鑽頭件; 一攻牙單元,軸向圍繞該螺桿而呈螺旋延伸狀,並包括多個由該螺桿徑向往外漸縮延伸且彼此連續地連接的切削刃;及 一協固單元,包括多個彼此相間隔地沿軸向設置於相鄰的切削刃間且徑向往外漸縮延伸的牙鋒件,及多個分別鄰近該等牙鋒件並凹設於該螺桿而界定出多個徑向往內凹設之榫接槽的凹面。A self-tapping screw, including: A screw head, including a body defining a screwdriver slot suitable for detachably clamping a driving tool; A screw, including a shaft member extending from the screw head along an axis, and a drill bit member extending from an end of the shaft member away from the screw head; A tapping unit, which axially surrounds the screw and extends in a spiral shape, and includes a plurality of cutting edges that extend radially outward from the screw and are continuously connected to each other; and A cohesive unit includes a plurality of tooth blades which are axially arranged between adjacent cutting edges at intervals and extend radially outwardly, and a plurality of tooth blades respectively adjacent to the tooth blades and recessed in the The screw defines a plurality of concave surfaces of the tenon grooves recessed radially inward. 如請求項1所述的自攻螺絲,其中,每一牙鋒件之頂緣相對於該桿身件之徑向距離大小為每一切削刃之頂緣相對於該桿身件之徑向距離大小的50%至70%。The self-tapping screw according to claim 1, wherein the radial distance between the top edge of each tooth edge and the shaft member is the radial distance between the top edge of each cutting edge and the shaft member 50% to 70% of the size. 如請求項1所述的自攻螺絲,其中,每一榫接槽之底緣相對於該桿身件之徑向距離大小為每一牙鋒件之頂緣相對於該桿身件之徑向距離大小的30%至50%。The self-tapping screw according to claim 1, wherein the radial distance between the bottom edge of each mortise groove and the shaft member is the radial distance between the top edge of each tooth and the shaft member 30% to 50% of the distance. 如請求項1所述的自攻螺絲,其中,每一牙鋒件具有一與該凹面相連的沉降區,及一位於沉降區另一側並適用於推抵一待攻物件的推升區。The self-tapping screw according to claim 1, wherein each of the threaded elements has a settlement area connected to the concave surface and a pushing area located on the other side of the settlement area and suitable for pushing against an object to be tapped. 如請求項4所述的自攻螺絲,其中,該沉降區是徑向往該軸線延伸。The self-tapping screw according to claim 4, wherein the settlement area extends radially toward the axis. 如請求項1所述的自攻螺絲,其中,該協固單元之每一牙鋒件是呈一由鄰近該鑽頭件之一側往鄰近該螺頭之一側漸縮延伸的四面體。The self-tapping screw according to claim 1, wherein each of the tooth elements of the co-fixing unit is a tetrahedron that tapers and extends from a side adjacent to the drill bit to a side adjacent to the screw head.
TW108131692A 2019-09-03 2019-09-03 Self-tapping screws TWI744688B (en)

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US2263137A (en) * 1940-03-02 1941-11-18 Parker Kalon Corp Fastener device
JPH0747965B2 (en) * 1990-07-09 1995-05-24 株式会社ヤマヒロ Metal fastener and its driving tool
US5273383A (en) * 1991-04-04 1993-12-28 Research Engineering & Manufacturing, Inc. Threaded fastener for use in thermoplastics and roll die for producing same
JP2003042122A (en) * 2001-07-27 2003-02-13 Yao Seibyou Kk Wood screw
TW560584U (en) * 2003-02-18 2003-11-01 Fong Prean Ind Co Ltd Improvement of screw
SE529577C2 (en) * 2005-12-22 2007-09-25 Essve Produkter Ab Screw
US20070224019A1 (en) * 2006-03-27 2007-09-27 Troy Hale Tapping screw
US8057147B2 (en) * 2008-07-03 2011-11-15 Illinois Tool Works Inc Self-drilling anchor
TWM350622U (en) * 2008-08-06 2009-02-11 Channg Chin Industry Corp Anti-cracking screw
TWM392886U (en) * 2010-06-25 2010-11-21 Essence Method Refine Co Ltd Self-tapping fastener
PT2806174E (en) * 2013-05-24 2015-10-29 Spax Int Gmbh & Co Kg Screw element

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