TW201716697A - Self-tapping screw drilling tail structure for enhancing drilling capability and speed of drill/cut edges to achieve high screwing speed and labor saving - Google Patents
Self-tapping screw drilling tail structure for enhancing drilling capability and speed of drill/cut edges to achieve high screwing speed and labor saving Download PDFInfo
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Description
本發明係有關於一種螺絲結構，尤指一種可快速省力鎖入工件之自攻螺絲鑽尾結構。 The invention relates to a screw structure, in particular to a self-tapping screw tail structure which can quickly and effortlessly lock into a workpiece.
按，螺絲係一種相當基本且普遍應用於生活中之五金產品，廣泛地應用於固定或結合物品之用途上，其中有一種自攻螺絲可在工作無法預先設置螺孔的場合下，作為快速攻入工件並螺鎖之用。 Press, the screw is a fairly basic and commonly used hardware product in life, widely used in the purpose of fixing or combining articles. There is a self-tapping screw which can be used as a fast attack in the case where the screw hole cannot be preset. Into the workpiece and screw lock.
如公告第M380396號「自攻螺絲之鑽頭結構改良」新型專利，即為一種習知自攻螺絲結構，該自攻螺絲，沿軸向依序設有帽頭、外螺紋段、及鑽頭所組成，該鑽頭末端形成有尖錐柱，沿其中心軸向對稱縱向刮面，於縱向刮面鄰邊形成有排屑面，而縱向刮面之外邊緣分別形成側刀鋒口及下刀鋒口；其特徵在於：該鑽頭位在其中一縱向刮面或兩縱向刮面之下刀鋒口外緣向下一體延伸有凸刮面，該凸刮面係向後延伸有曲弧段，俾以藉由在刮面之下刀鋒口外側增設之凸刮面，以達到增加刀刃利度功能，及位在下刀鋒口與鄰接凸刮面之間自然形成一排屑導孔，可快速將刮出之殘屑經由排屑導孔排出。 For example, the new patent No. M380396 "Modification of the bit structure of self-tapping screws" is a conventional self-tapping screw structure. The self-tapping screws are provided with a cap head, an external thread section and a drill bit in the axial direction. The tip end of the drill bit is formed with a pointed cone column, and the longitudinal longitudinal direction of the longitudinal scraping surface is formed with a chip discharging surface, and the outer edge of the longitudinal scraping surface respectively forms a side blade edge and a lower blade edge; The utility model is characterized in that the drill bit is integrally extended downwardly with a convex scraping surface on a longitudinal edge of the longitudinal scraping surface or the two longitudinal scraping surfaces, and the convex scraping surface is extended backward with a curved arc, by means of the scraping surface The convex scraping surface is added on the outer side of the blade edge to increase the blade edge function, and a chip guiding hole is naturally formed between the lower blade edge and the adjacent convex scraping surface, so that the scraped scrap can be quickly passed through the chip discharging. The guide holes are discharged.
惟，該習知自攻螺絲結構，由於其凸刮面係設置於縱向刮面下刀鋒口外緣，因而當該自攻螺絲鎖入工件時，係利用鑽頭末端之尖錐柱抵觸於工件表面上作定位，並於工具帶動自攻螺絲旋轉的狀態下，使得 該尖錐柱磨損或***工件內，直到設置於縱向刮面下刀鋒口外緣之凸刮面接觸工件表面方可進行後續鑽削動作，因而一開始鑽入的切削效果差，致使螺鎖速度慢並且費力，此外，該鑽頭在鑽削工件過程中，所產生之屑料將會成長條狀，該長條狀之屑料極容易纏繞於鑽頭及螺牙而阻塞於工件之間，該長條狀之屑料若無法有效被快速排出工件之外，不僅會阻礙自攻螺絲之鑽削動作，至使自攻螺絲之攻速不穩定，造成自攻螺絲鑽削旋入工件所費時間加長，嚴重者甚至會令自攻螺絲產生斷毀之情形。 However, the conventional self-tapping screw structure has a convex scraping surface disposed on the outer edge of the lower blade edge of the longitudinal scraping surface, so that when the self-tapping screw is locked into the workpiece, the tip end of the drill bit is used to abut against the surface of the workpiece. Positioning, and in the state that the tool drives the self-tapping screw to rotate, The tapered cone is worn or inserted into the workpiece until the convex scraping surface of the outer edge of the lower cutting edge of the longitudinal scraping surface contacts the surface of the workpiece for subsequent drilling, so that the cutting effect at the beginning of drilling is poor, resulting in a slow screw locking speed. Moreover, it is laborious. In addition, during the drilling of the workpiece, the generated scraps will grow into strips, and the long strips are easily entangled in the drill bit and the thread to block between the workpieces. If the scraps of the shape cannot be effectively discharged quickly, it will not only hinder the drilling of the self-tapping screws, but also make the attack speed of the self-tapping screws unstable, which will cause the self-tapping screws to be screwed into the workpiece for a long time. In severe cases, the self-tapping screws may even be broken.
本發明人有鑑於習知鑽尾螺絲，具有螺鎖速度慢、費力及屑料容易纏繞影響自攻螺絲鎖入工件等缺點，是以乃思及創作的意念，經多方探討與試作樣品試驗，及多次修正改良後，終推出本發明。 The inventor has the disadvantages of the conventional drill-tail screw, which has the advantages of slow screw-locking speed, laborious force and easy entanglement of the chipping material to affect the self-tapping screw locking into the workpiece, and is based on the idea of creating and testing the sample. After a number of corrections and improvements, the present invention was finally introduced.
本發明提供一種具有自攻螺絲鑽尾結構，該自攻螺絲鎖入工件的旋轉方向為正轉方向，該自攻螺絲自工件鬆退的旋轉方向為逆轉方向，該自攻螺絲包含：一螺頭、一桿體及一鑽尾，該螺頭係用以與工具相接，該桿體係由該螺頭一體延伸，周緣設有螺旋環繞之螺牙，該鑽尾係一體成型於該桿體遠離螺頭的一端，並與該螺牙銜接，該鑽尾末端設置一圓錐面，該圓錐面末端設置一鑽尖，另該鑽尾周緣設有弧形加大之兩排屑槽延伸至該圓錐面之鑽尖，該兩排屑槽與圓錐面及鑽尾周緣相接處分別形成兩鑽切刃與兩切削刃，該兩鑽切刃鄰近鑽尖處設有凸起之相對兩鑽刃部，該鑽切刃並配合鑽刃部形成弧凹狀的延伸，且該弧凹狀的鑽切刃不低於該圓錐面，令鑽切刃長度被延伸，該兩鑽刃部往正轉方向延伸設有一斷屑部，及往逆轉方向延伸設有一補強部，該兩鑽切刃與兩切削刃相接之轉角處 設有一補強用之凸部。 The invention provides a self-tapping screw tail structure, wherein the rotation direction of the self-tapping screw locked into the workpiece is a forward rotation direction, and the rotation direction of the self-tapping screw retracting from the workpiece is a reverse direction, and the self-tapping screw comprises: a screw a head, a rod body and a drill tail, the screw head is used for contacting with a tool, the rod system is integrally extended by the screw head, and a spiral surrounding screw is arranged on the periphery, and the drill tail is integrally formed on the rod body An end of the screw head is connected to the threaded end, and a taper surface is disposed at the end of the drill tail. The tip end of the taper surface is provided with a drill tip, and the periphery of the drill tail is provided with two arcuate grooves extending from the periphery of the drill tail. a taper of the conical surface, the two flutes and the conical surface and the periphery of the drill tail respectively form two drill cutting edges and two cutting edges, and the two drill cutting edges are opposite to the drill tip and have opposite protrusions The drill cutting edge and the drilling edge portion form an arc-shaped extension, and the arc-shaped concave cutting edge is not lower than the conical surface, so that the length of the cutting cutting edge is extended, and the two cutting edges are forwardly rotated. a chip breaking portion is arranged in the direction, and a reinforcing portion is extended in the reverse direction, and the two drills are cut. In contact with two of the corner cutting edge There is a convex part for reinforcement.
本發明之主要目的，在於其兩鑽切刃鄰近鑽尖處設有凸起之相對鑽刃部，該鑽切刃並配合鑽刃部形成弧凹狀的延伸，且該弧凹狀的鑽切刃不低於該圓錐面，以鑽刃部在鑽切刃的設計並配合鑽切刃弧凹狀的延伸，該能加強鑽刃部的根部，並能夠在桿體相同的圓徑中，大幅度增加鑽切刃的長度，藉此增加鑽切刃的鑽孔能力與速度。 The main object of the present invention is that the two drill cutting edges are provided with convex corresponding edge portions adjacent to the drill tip, and the drill cutting edges cooperate with the drilling edge portion to form an arc-shaped extension, and the arc is concavely cut and cut. The blade is not lower than the conical surface, and the design of the drill cutting edge in the cutting cutting edge and the concave extension of the drilling cutting edge arc can strengthen the root of the drilling edge portion and can be large in the same circular diameter of the rod body. The amplitude increases the length of the cutting edge, thereby increasing the drilling capability and speed of the cutting edge.
本發明之主要目的，在於其自攻螺絲鎖入工件時，利用鑽尾之鑽尖抵觸於工件表面上定位，於工具帶動自攻螺絲旋轉的狀態下，使得該鑽尖稍磨損或鑽入工件表面後，兩鑽刃部立即與工件表面接觸進行鑽削動作，俾達自攻螺絲之螺鎖速度快並且省力。 The main purpose of the invention is that when the self-tapping screw is locked into the workpiece, the drill tip is used to resist the positioning on the surface of the workpiece, and the tool tip drives the self-tapping screw to rotate, so that the drill tip is slightly worn or drilled into the workpiece. After the surface, the two drilling edges immediately contact the surface of the workpiece for drilling, and the screw locking speed of the self-tapping screws is fast and labor-saving.
本發明之次一目的，在於其自攻螺絲鎖入工件時，鑽尾在鑽削工件過程中，所產生之屑料會被斷屑部截斷順利快速由弧形加大之排屑槽排出工件外，避免屑料纏繞影響自攻螺絲鑽削動作，並且該斷屑部可增加鑽刃部之結構強度。 The second object of the present invention is that when the self-tapping screw is locked into the workpiece, the chip generated during the drilling of the workpiece is cut off by the chip breaking portion, and the workpiece is discharged from the arc-shaped chip chute. In addition, avoiding the entanglement of the chip affects the self-tapping screw drilling action, and the chip breaking portion can increase the structural strength of the drill blade portion.
1‧‧‧自攻螺絲 1‧‧‧ Self-tapping screws
2‧‧‧工件 2‧‧‧Workpiece
10‧‧‧螺頭 10‧‧‧ screw head
20‧‧‧桿體 20‧‧‧ rod body
21‧‧‧螺牙 21‧‧‧ thread
30‧‧‧鑽尾 30‧‧‧Drilling tail
31‧‧‧圓錐面 31‧‧‧Conical surface
311‧‧‧鑽尖 311‧‧‧ drill tip
32‧‧‧排屑槽 32‧‧‧chip flute
33‧‧‧鑽切刃 33‧‧‧Drilling cutting edge
34‧‧‧切削刃 34‧‧‧ cutting edge
35‧‧‧鑽刃部 35‧‧‧Drilling
351‧‧‧斷屑部 351‧‧‧ chip breaking
352‧‧‧補強部 352‧‧‧Reinforcement Department
第一圖係本發明之立體圖。 The first figure is a perspective view of the present invention.
第二圖係第一圖A部分之放大圖。 The second figure is an enlarged view of the portion A of the first figure.
第三圖係本發明之平面圖。 The third figure is a plan view of the present invention.
第四圖係第三圖B部分之放大圖。 The fourth figure is an enlarged view of part B of the third figure.
第五圖係本發明鎖入工件時以鑽尖定位之示意圖。 The fifth figure is a schematic diagram of the positioning of the drill tip when the invention is locked into the workpiece.
第六圖係本發明兩鑽刃部與工件表面接觸進行鑽削之示意圖。 The sixth figure is a schematic view of the two drill cutting edges of the present invention in contact with the surface of the workpiece for drilling.
第七圖係本發明鑽尾末端對工件進行鑽削之示意圖。 The seventh figure is a schematic view of the end of the drill tail of the present invention for drilling a workpiece.
第八圖係本發明鑽尾對工件進行鑽削之示意圖。 The eighth figure is a schematic view of the drilling of the workpiece by the drill tail of the present invention.
請參閱第一圖、第二圖、第三圖及第四圖，本發明自攻螺絲鑽尾結構，該自攻螺絲1進行螺鎖的旋轉方向為正轉方向，該螺絲1進行鬆退的旋轉方向為逆轉方向，該自攻螺絲1包含：一螺頭10、一桿體20及一鑽尾30，該螺頭10係用以與工具相接，該桿體20係由該螺頭10一體延伸而成，周緣設有螺旋環繞之螺牙21，該鑽尾30係一體成型於該桿體20遠離螺頭10的一端，並與該桿體20周緣的螺牙21銜接，該鑽尾30末端設置一圓錐面31，該圓錐面31末端設置一鑽尖311，另該鑽尾30周緣設有弧形加大之對稱兩排屑槽32延伸至該圓錐面31之鑽尖311，該兩排屑槽32與圓錐面31相接處形成兩鑽切刃33，該兩排屑槽32與鑽尾30周緣相接處形成兩切削刃34，該兩鑽切刃33往自攻螺絲1正轉方向凸出，該兩切削刃34往自攻螺紋1正轉方向凸出，該兩鑽切刃33鄰近鑽尖311處設有凸起之相對兩鑽刃部35，該兩鑽刃部35為等高設置，另該鑽切刃33並配合鑽刃部35形成弧凹狀的延伸，且該弧凹狀的鑽切刃33不低於該圓錐面31，令鑽切刃33長度被延伸，該兩鑽刃部35往自攻螺絲1正轉方向延伸設有一斷屑部351，及往自攻螺絲1逆轉方向延伸設有一補強部352，該斷屑部351用以截斷屑料與增加鑽刃部35結構強度，該補強部352用以增加鑽刃部35結構強度，該兩鑽切刃33與兩切削刃34相接之轉角處設有一補強用之凸部36。 Referring to the first, second, third and fourth figures, the self-tapping screw tail structure of the present invention, the rotation direction of the self-tapping screw 1 is a forward rotation direction, and the screw 1 is retracted. The rotation direction is a reverse direction, and the self-tapping screw 1 comprises: a screw head 10, a rod body 20 and a drill tail 30, the screw head 10 is used for contacting the tool, and the rod body 20 is composed of the screw head 10 The outer periphery is provided with a spirally surrounding screw 21, and the drill tail 30 is integrally formed on one end of the rod body 20 away from the screw head 10, and is engaged with the thread 21 of the periphery of the rod body 20, the drill tail A conical surface 31 is disposed at the end of the 30, a tip 311 is disposed at the end of the conical surface 31, and a circumference of the boring tail 30 is provided with an arc-shaped symmetrical two-piece flute 32 extending to the drill 311 of the conical surface 31. A two-drill cutting edge 33 is formed at the junction of the two flutes 32 and the conical surface 31. The two flutes 32 are formed at the periphery of the drill tail 30 to form two cutting edges 34. The two cutting edges 33 are self-tapping screws 1 The two cutting edges 34 protrude toward the forward rotation direction of the self-tapping thread 1 , and the two drill cutting edges 33 are provided with convex relative diamond edge portions 35 adjacent to the drill point 311 . The two cutting edge portions 35 are disposed at an equal height, and the cutting cutting edge 33 and the drilling edge portion 35 form an arc-shaped extension, and the arc-shaped concave cutting edge 33 is not lower than the conical surface 31, so that the drilling The length of the cutting edge 33 is extended, and the two cutting edge portions 35 are extended with a chip breaking portion 351 in the forward direction of the tapping screw 1 and a reinforcing portion 352 extending in the reverse direction of the tapping screw 1 for the chip breaking portion 351 The reinforcing portion 352 is configured to increase the structural strength of the cutting edge portion 35, and the reinforcing portion 352 is provided with a reinforcing convex portion at a corner where the two cutting edges 33 are joined to the cutting edge portion 34. 36.
本發明自攻螺絲1鎖入工件2時，如第五圖所示，利用自攻螺絲1鑽尾30之鑽尖311抵觸於工件2表面上定位，以工具與螺絲1螺頭10套 合或夾持相接，而由該工具帶動自攻螺絲1往正轉方向旋轉，使得該鑽尖311稍磨損或鑽入工件2表面後，如第六圖所示，兩鑽刃部35立即與工件2表面接觸進行鑽削動作，提高自攻螺絲1的鑽孔能力，以便鑽尾30之鑽切刃33及切削刃34順利鑽削動作，快速、省力完成自攻螺絲1之螺鎖作業。 When the self-tapping screw 1 of the present invention is locked into the workpiece 2, as shown in the fifth figure, the drill tip 311 of the self-tapping screw 1 is used to be positioned against the surface of the workpiece 2, with 10 sets of tools and screws 1 When the clamping or the clamping is connected, the self-tapping screw 1 is rotated by the tool in the forward rotation direction, so that the drill tip 311 is slightly worn or drilled into the surface of the workpiece 2, as shown in the sixth figure, the two drilling edge portions 35 are immediately The drilling operation is performed in contact with the surface of the workpiece 2, and the drilling capability of the self-tapping screw 1 is improved, so that the drilling cutting edge 33 and the cutting edge 34 of the drilling tail 30 are smoothly drilled, and the screw locking operation of the self-tapping screw 1 is completed quickly and labor-savingly. .
並且，如第七圖及第八圖所示，當兩鑽刃部35與工件2表面接觸進行鑽削動作時，屑料會被斷屑部351所截斷，使原成長條狀之屑料變成為小片段狀，該成小片段狀之屑料即沿弧形加大之兩排屑槽32向上推擠而對外排出，而因該屑料已成小片段之狀即不會發生纏繞現象，故可輕易由兩排屑槽32排出，使本發明之自攻螺絲1之鑽削動作得以保持其順暢，而有助其鑽削功能之表現。 Further, as shown in the seventh and eighth figures, when the two drill blade portions 35 are in contact with the surface of the workpiece 2 for the drilling operation, the chips are cut by the chip breaking portion 351, and the original strip-shaped chips are turned into In the form of a small segment, the small fragment-shaped chip material is pushed upward by the two chip flutes 32 which are enlarged in an arc shape, and is discharged to the outside, and the entanglement phenomenon does not occur because the chip material has been formed into a small segment. Therefore, it can be easily discharged from the two flutes 32, so that the drilling operation of the self-tapping screw 1 of the present invention can be kept smooth, and the performance of the drilling function can be improved.
又，當自攻螺絲1之兩鑽切刃33與兩切削刃34相接之轉角處接觸工件時，可藉由該轉角處設置之凸部36達到補強作用，以避免該轉角處崩裂影響自攻螺絲1螺鎖能力。 Moreover, when the two drill cutting edges 33 of the tapping screw 1 contact the workpiece at the corners where the two cutting edges 34 meet, the reinforcing portion 36 provided at the corner can be used to achieve the reinforcing effect to avoid the cracking effect at the corner. Tighten the screw 1 screw lock ability.
由上述具體實施例之結構，可得到下述之效益： From the structure of the above specific embodiment, the following benefits can be obtained:
1.本發明的兩鑽切刃33鄰近鑽尖處設有凸起之相對鑽刃部35，該鑽切刃33並配合鑽刃部35形成弧凹狀的延伸，且該弧凹狀的鑽切刃33不低於該圓錐面31，以鑽刃部35在鑽切刃33的設計並配合鑽切刃33弧凹狀的延伸，該能加強鑽刃部35的根部，並能夠在桿體相同的圓徑中，大幅度增加鑽切刃33的長度，藉此增加鑽切刃33的鑽孔能力與速度。 1. The two-drill cutting edge 33 of the present invention is provided with a raised opposite cutting edge portion 35 adjacent to the drill tip, the drilling cutting edge 33 and the drilling edge portion 35 forming an arc-shaped concave extension, and the arc-shaped concave drill The cutting edge 33 is not lower than the conical surface 31, so that the cutting edge portion 35 is designed in the cutting edge 33 and cooperates with the arcuate extension of the cutting edge 33, which can strengthen the root of the cutting edge portion 35 and can be in the rod body In the same circular diameter, the length of the cutting edge 33 is greatly increased, thereby increasing the drilling ability and speed of the cutting edge 33.
2.本發明自攻螺絲鑽尾結構，其自攻螺絲1鎖入工件2時，係利用鑽尾30之鑽尖311抵觸於工件2表面上定位，於工具帶動自攻螺絲1旋轉的狀態下，使得該鑽尖311稍磨損或鑽入工件2表面後，兩鑽刃部35立 即與工件2表面接觸進行鑽削動作，以便鑽尾30之鑽切刃33及切削刃34順利鑽削動作，俾達自攻螺絲之螺鎖速度快並且省力。 2. The self-tapping screw tailing structure of the present invention, when the self-tapping screw 1 is locked into the workpiece 2, the drill tip 311 of the drill tail 30 is used to be in contact with the surface of the workpiece 2, and the tool drives the self-tapping screw 1 to rotate. After the drill tip 311 is slightly worn or drilled into the surface of the workpiece 2, the two drilled edges are 35 That is, the drilling operation is performed in contact with the surface of the workpiece 2, so that the drilling cutting edge 33 and the cutting edge 34 of the drilling tail 30 are smoothly drilled, and the screw locking speed of the self-tapping screw is fast and labor-saving.
3.本發明自攻螺絲鑽尾結構，其自攻螺絲1鎖入工件2時，鑽尾30在鑽削工件2過程中，所產生之屑料會被斷屑部351截斷成為小片段狀，以便順利快速由弧形加大之兩排屑槽32排出工件2外，避免屑料纏繞影響自攻螺絲1鑽削動作，並且該斷屑部351可增加鑽刃部35之結構強度，使鑽刃部35具有更佳之鑽削能力。 3. The self-tapping screw tail structure of the present invention, when the self-tapping screw 1 is locked into the workpiece 2, during the drilling of the workpiece 2, the generated scrap material is cut off by the chip breaking portion 351 into a small segment shape. In order to smoothly and quickly exit the workpiece 2 from the two increased flutes 32, the chip winding is prevented from affecting the drilling action of the tapping screw 1, and the chip breaking portion 351 can increase the structural strength of the cutting edge portion 35, so that the drilling The blade portion 35 has better drilling ability.
1‧‧‧自攻螺絲 1‧‧‧ Self-tapping screws
30‧‧‧鑽尾 30‧‧‧Drilling tail
31‧‧‧圓錐面 31‧‧‧Conical surface
311‧‧‧鑽尖 311‧‧‧ drill tip
32‧‧‧排屑槽 32‧‧‧chip flute
33‧‧‧鑽切刃 33‧‧‧Drilling cutting edge
34‧‧‧切削刃 34‧‧‧ cutting edge
35‧‧‧鑽刃部 35‧‧‧Drilling
351‧‧‧斷屑部 351‧‧‧ chip breaking
352‧‧‧補強部 352‧‧‧Reinforcement Department
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW104137272A TW201716697A (en) | 2015-11-11 | 2015-11-11 | Self-tapping screw drilling tail structure for enhancing drilling capability and speed of drill/cut edges to achieve high screwing speed and labor saving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW104137272A TW201716697A (en) | 2015-11-11 | 2015-11-11 | Self-tapping screw drilling tail structure for enhancing drilling capability and speed of drill/cut edges to achieve high screwing speed and labor saving |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TWI563182B TWI563182B (en) | 2016-12-21 |
| TW201716697A true TW201716697A (en) | 2017-05-16 |
Family
ID=58227435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW104137272A TW201716697A (en) | 2015-11-11 | 2015-11-11 | Self-tapping screw drilling tail structure for enhancing drilling capability and speed of drill/cut edges to achieve high screwing speed and labor saving |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TW201716697A (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0136912B1 (en) * | 1983-10-04 | 1989-12-20 | W.A. Deutsher Pty. Ltd. | Self-drilling screw |
| GB2185915B (en) * | 1986-01-09 | 1989-11-22 | Usm Corp | Groove point screw |
| US5046905A (en) * | 1989-07-06 | 1991-09-10 | Emhart Inc. | Winged drill screw |
| TW200936897A (en) * | 2008-02-20 | 2009-09-01 | shi-zhong Huang | Self tapping screw |
-
2015
- 2015-11-11 TW TW104137272A patent/TW201716697A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TWI563182B (en) | 2016-12-21 |
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