TWM540937U - Self-drilling screw - Google Patents
Self-drilling screw Download PDFInfo
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- TWM540937U TWM540937U TW106200297U TW106200297U TWM540937U TW M540937 U TWM540937 U TW M540937U TW 106200297 U TW106200297 U TW 106200297U TW 106200297 U TW106200297 U TW 106200297U TW M540937 U TWM540937 U TW M540937U
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- 238000005553 drilling Methods 0.000 title claims description 36
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
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Description
本創作係有關於一種螺絲設計,特別是有關一種鑽尾螺絲。This creation is about a screw design, especially with regard to a type of self-drilling screw.
參閱圖1、圖2,習知鑽尾螺絲1包含有一螺頭11,一由該螺頭11上且向外延伸之桿體12,複數螺旋環設於該桿體12上之螺牙13,以及一相反該螺頭11且設於該桿體12上之鑽鎖單元14;其中,該鑽鎖單元14具有一與該桿體12相接之鑽體141,一成形於該鑽體141之端部的端面142,二開設於該鑽體141上且將該端面142分成兩對邊之導屑溝143,一形成於該鑽體141與該等導屑溝143相接處之二鑽刃144,以及一形成於該二鑽刃144相接處之定位端145,而前述該每一導屑溝143與該鑽體141相接處分別形成有一止擋面146、平面147與切削刃148;進行鎖合作業時,藉由該定位端145頂掣於該物件2上,並施予一旋轉力以使分設於該定位端145二側之該鑽刃144先行鑽削,以導引該鑽體141螺合進入該物件2內,而鑽削過程中產生之切屑,再利用與該二鑽刃144相接之該等導屑溝143可供該切屑容置且向外排出,如此以完成該鑽尾螺絲1的鎖合定位。Referring to FIG. 1 and FIG. 2, the conventional self-drilling screw 1 includes a screw head 11, a rod body 12 extending from the screw head 11 and extending outwardly, and a plurality of screw rings 13 disposed on the rod body 12, And a drill lock unit 14 opposite to the screw head 11 and disposed on the rod body 12; wherein the drill lock unit 14 has a drill body 141 that is in contact with the rod body 12, and is formed on the drill body 141. The end surface 142 of the end portion is formed on the drill body 141 and the end surface 142 is divided into two pairs of guiding grooves 143, and two cutting edges are formed at the joint of the drilling body 141 and the guiding grooves 143. 144, and a positioning end 145 formed at the intersection of the two cutting edges 144, and each of the guiding grooves 143 and the drilling body 141 are respectively formed with a stopping surface 146, a plane 147 and a cutting edge 148. When the lock cooperation is performed, the positioning end 145 is placed on the object 2, and a rotational force is applied to drill the cutting edge 144 disposed on two sides of the positioning end 145 for guiding. The drill body 141 is screwed into the object 2, and the chips generated during the drilling process are used to receive the chips and are arranged outwardly by the guide grooves 143 which are connected to the two drill edges 144. This is done to complete the locking positioning of the self-drilling screw 1.
惟,使用後發現,鑒於該導屑溝143係直接開設於該鑽體141上,致使該端面142與該導屑溝143呈不連通之形態設置,因此鑽切所產生之切屑便會受到該端面142的抵掣下壓及受到該止擋面146的阻擋,而無法順利進入該導屑溝143中,無形中會造成該二鑽刃144之鑽鎖阻力增加,進而導致切削速度降低,導致使用者必需再施予更大之旋轉力,才能使該切削刃148接續鑽鎖於該物件2中,如此一來更會使該等鑽刃144產生磨損,而影響初期鎖合作業的進行。However, it has been found that, since the guide groove 143 is directly opened on the drill body 141, the end surface 142 is disposed in a non-connecting manner with the guide groove 143, so that the chips generated by the drilling and cutting are subjected to the The abutting pressure of the end surface 142 is blocked by the stopping surface 146, and cannot smoothly enter the guiding groove 143, which inevitably increases the drilling resistance of the two drilling edges 144, thereby causing the cutting speed to decrease, resulting in a decrease in cutting speed. The user must apply a greater rotational force to allow the cutting edge 148 to be drilled in the object 2, which will cause the cutting edges 144 to wear and affect the initial lock cooperation.
再者,習知為有效加強該鑽鎖單元14之鑽鎖強度,一般即會在該鑽鎖單元14成型過程中進行熱處理加工,但該加工方式會導致該鑽鎖單元14產生過度硬化,也會使該等鑽刃144因硬化之因素而無法有效抵抗鎖合應力,故在鑽切初期即產生毀損與斷裂現象,導致影響該鑽尾螺絲1後續鑽鎖切削能力及降低合速度,實有待改進。Moreover, in order to effectively strengthen the drill lock strength of the drill lock unit 14, the heat treatment process is generally performed during the molding process of the drill lock unit 14, but the machining method may cause the drill lock unit 14 to be excessively hardened. The drilling edge 144 can not effectively resist the locking stress due to the hardening factor, so the damage and fracture phenomenon occurs at the initial stage of the drilling, which affects the subsequent drilling and cutting ability of the drilling screw 1 and reduces the combined speed. Improve.
因此,本新型之目的,是在提供一種鑽尾螺絲,其可增加導屑的順暢性及提高切屑的容置效果,故使用上可達到快速鎖合及降鎖合扭力等功效。Therefore, the purpose of the present invention is to provide a drill-tail screw, which can improve the smoothness of the guide chip and improve the storage effect of the chip, so that the use can achieve the effects of quick locking and lowering the locking torque.
於是,本新型鑽尾螺絲其包含有一螺頭、一桿體、複數螺牙及一鑽鎖單元;其中,該鑽鎖單元具有一與該桿體相接之鑽體,一成形於該鑽體之端部的端面,二開設於該鑽體上且將該端面分成兩對邊之導屑溝,分別形成該等端面與該等導屑溝相接處之二鑽刃,以及該二鑽刃相接形成有一定位端,而該每一導屑溝具有一止擋面,一與該止擋面相接之平面,以及一形成於該平面與該鑽體相接處並與該鑽刃連接之切削刃,同時該止擋面上形成有一凹陷弧面,且該凹陷弧面係由該端面朝該平面方向延伸,同時還向下延伸以連接至該定位端;是以,鑽鎖過程中,利用該止檔面上所形成之凹陷弧面的設置,其可令鑽切時所產生大量切屑無受阻的經由該端面、凹陷弧面以迅速進入該導屑溝中再向外排出,以免除該等鑽刃受到積存過多切屑的阻礙而造成鑽鎖扭力的增加,進而達到快速鎖合定位效果。Therefore, the drill shaft of the present invention comprises a screw head, a rod body, a plurality of thread teeth and a drill lock unit; wherein the drill lock unit has a drill body connected to the rod body, and a drill body is formed on the drill body The end surface of the end portion is formed on the drill body and the end surface is divided into two pairs of side guide grooves, respectively forming two drill edges at the end faces of the guide grooves, and the two drill edges Forming a positioning end, and each of the guiding grooves has a stopping surface, a plane contacting the stopping surface, and a surface formed at the plane contacting the drilling body and connected to the drilling edge a cutting edge, and a concave curved surface is formed on the stopping surface, and the concave curved surface extends from the end surface toward the plane direction, and also extends downward to connect to the positioning end; The arrangement of the concave curved surface formed on the stop surface can make a large amount of chips generated during drilling and cutting unimpeded through the end surface and the concave curved surface to quickly enter the guiding groove and then discharge outward. In order to prevent the drill blades from being obstructed by excessive accumulation of chips, the torque of the drill lock is increased. , So as to achieve rapid closure positioning effect.
有關本新型之前述及其他技術內容、特點與功效,在以下配合參考圖式之較佳實施例的詳細說明中,將可清楚的明白。The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.
參閱圖3、圖4,本新型之第一較佳實施例之鑽尾螺絲3包含有一螺頭31,一設於該螺頭31上且向外延伸之桿體32,複數螺旋環設於該桿體32上之螺牙33,以及一相反該螺頭31且設於該桿體32另一端之鑽鎖單元34;其中,該鑽鎖單元34具有一與該桿體32相接之鑽體341,一成形於該鑽體341之端部的端面342,二開設於該鑽體341上且將該端面342分成兩對邊之導屑溝343,分別形成於該等端面342與該等導屑溝343相接處之二鑽刃344,以及二鑽刃344相接形成有一定位端345,前述該每一導屑溝343具有一止擋面346,一與該止擋面346相接之平面347,以及一形成於該平面347與該鑽體341相接處之切削刃348,而前述該定位端345係呈一向外凸出之尖狀,且形成有一夾角α設置。Referring to FIG. 3 and FIG. 4, the self-drilling screw 3 of the first preferred embodiment of the present invention includes a screw head 31, a rod body 32 disposed on the screw head 31 and extending outwardly, and a plurality of spiral rings are disposed thereon. a thread 33 on the rod body 32, and a drill lock unit 34 opposite to the screw head 31 and disposed at the other end of the rod body 32; wherein the drill lock unit 34 has a drill body connected to the rod body 32 341, an end surface 342 formed at an end of the drill body 341 is formed on the drill body 341, and the end surface 342 is divided into two pairs of side guide grooves 343 formed on the end surfaces 342 and the guide The two drill edges 344 at the junction of the ditch 343 and the two drill edges 344 are connected to each other to form a positioning end 345. Each of the guiding grooves 343 has a stopping surface 346, and the stopping surface 346 is connected thereto. A plane 347, and a cutting edge 348 formed on the plane 347 at the intersection of the drill body 341, and the positioning end 345 is formed in an outwardly convex shape and formed with an angle α.
仍續前述,該止擋面346上形成有一凹陷弧面349,且該凹陷弧面349係由該端面342延伸至該平面347處,即如圖4所示,以使該凹陷弧面349係延伸於該端面342與該止擋面346的相接處至該止檔面346與該平面347的相接處之間,同時該凹陷弧面349更向下延伸以連接至該定位端345,因而能增加導屑的順暢性及擴大該每一導屑溝343的整體空間。Continuing the foregoing, the stop surface 346 is formed with a concave curved surface 349, and the concave curved surface 349 extends from the end surface 342 to the plane 347, as shown in FIG. 4, so that the concave curved surface 349 is Extending from the end of the end surface 342 and the stop surface 346 to the junction of the stop surface 346 and the plane 347, while the concave curved surface 349 extends downward to connect to the positioning end 345, Therefore, the smoothness of the guide chips can be increased and the overall space of each of the guide grooves 343 can be enlarged.
參閱圖3至圖5,進行鎖合作業時,可先藉由該定位端345抵掣於鎖合物件4上,由於該定位端345呈凸出尖狀,故頂掣於該鎖合物件4時會產生一穩固定位且不會形成任意偏移滑動現象,而後利用一鎖合工具(圖中未示出)在該螺頭31上施予一旋轉扭力,以連動該二鑽刃344產生旋轉鑽切,以逐步鑽攻進入該鎖合物件4中,而該鑽體341之切削刃348便會緊接進行鑽切,進而產生複數切屑,此時,在該端面342與該導屑溝343所形成之該凹陷弧面349的配合下,由該等鑽刃344鑽切時產生之切屑會先行進入該每一凹陷弧面349中,故可使切屑不會受到該端面342 壓掣,也不會受到該止擋面346的阻擋,同時該切削刃348鑽切所形成之切屑亦得以有效且快速被導引進入該導屑溝343中,如此一來該等鑽刃344及該切削刃348所切削的切屑便可由該導屑溝343向外排出,因而可使該等鑽刃344與該切削刃348的切削阻力大幅降低,再者,更鑒於形成於該止擋面346上之該凹陷弧面349係在該端面342、平面347及定位端345之間做延伸擴展,故可使該端面342因該凹陷弧面349的設置而得以與該平面347呈連通,不但能增加導屑的順暢性,且更可擴大該導屑溝343的整體容屑空間,進而具有足夠空間可供部分之切屑留置於其中,進一步而言,在鑽切初期時該鑽鎖單元34得以利用該凹陷弧面349的設計來提高切屑的容置,進而達到具有較佳與快速之切削效果,藉以有效降低鎖合扭力及提升鎖合效率。Referring to FIG. 3 to FIG. 5, when the lock cooperation is performed, the positioning end 345 can be firstly engaged with the lock member 4. Since the positioning end 345 is convexly pointed, the top member is attached to the lock member 4. A stable fixed position is generated and no offset slip phenomenon is formed, and then a rotational torque is applied to the screw head 31 by a locking tool (not shown) to interlock the two drill edges 344 to rotate. Drilling and cutting, to gradually drill into the lock member 4, and the cutting edge 348 of the drill body 341 is drilled and cut, thereby generating a plurality of chips, at this time, the end face 342 and the guide groove 343 With the formation of the concave curved surface 349, the chips generated by the cutting edges 344 will enter the concave curved surface 349 first, so that the chips will not be crushed by the end surface 342, It is not blocked by the stop surface 346, and the chips formed by the cutting edge 348 are also effectively and quickly guided into the guide groove 343, so that the cutting edge 344 and the cutting edge The chips cut by 348 can be discharged outward from the guide groove 343, thereby enabling the cutting edges 344 and the cut The cutting resistance of the cutting edge 348 is greatly reduced. Further, in view of the extension of the concave curved surface 349 formed on the stop surface 346 between the end surface 342, the plane 347 and the positioning end 345, the The end surface 342 is in communication with the plane 347 due to the arrangement of the concave curved surface 349, which not only increases the smoothness of the guide chip, but also enlarges the overall chip space of the guide groove 343, thereby having sufficient space for the portion. The chip is left in the mold. Further, the drilling lock unit 34 can utilize the design of the concave curved surface 349 to improve the storage of the chip during the initial drilling, thereby achieving a better and faster cutting effect, thereby effectively reducing the cutting effect. Locking torque and lifting lock efficiency.
參閱圖6,本新型鑽尾螺絲3之第二較佳實例,仍包含有前一實施例所述之構件,且要件與要件間的連結關均與前一實施例所述相同,恕不贅述;特別的是,在本實施例中,該鑽鎖單元之該每一端面342係由第一、第二傾斜段3421、3422相接而成,而該第一傾斜段3421係與該鑽體341相接,而該第二傾斜段3422係由該第一傾斜段3421延伸至該定位端345,同時該等端面342之第一傾斜段3421所相接形成之夾角α1係大於該等端面342之第二傾斜段3422所相交組成之夾角α2,以使該端面342結合定位端345以形成一整體具有二段式且更向外凸出之尖狀設計;再者,於本實施例中,該每一切削刃348可由該等鑽刃344朝該桿體32呈傾斜設置,同時該等鑽刃344向外延伸所形成之最大外徑r2大於該桿體32之外徑r1,即該等鑽刃與該等切削刃348之相接處所形成為最大外徑r2,該最大外徑r2係大於該桿體之外徑r1;鎖合時,可利用該定位端345所形成之特殊尖狀設計,以達到初步不偏移之定位作用,俾當該二鑽刃344進入該鎖合物件4內時,即得以利用前述最大外徑r2大於該外徑r1之特性,以使該二鑽刃344頂掣於該鎖合物件4上,故該二鑽刃344與該定位端呈現三點式的支撐定位效果,俾使該定位端345與該二鑽刃344於鑽切時,得以有效抵抗鑽鎖應力且不有斷裂之情事產生,並以進一步帶動該鑽體341進行快速之鑽切,同時再藉由該凹陷弧面349之設置,可令切屑無受阻地進入該導屑溝343中向外排出,進而增加該鑽尾螺絲3的鎖合速度與緊固力。Referring to FIG. 6, the second preferred embodiment of the present type of self-drilling screw 3 still includes the components described in the previous embodiment, and the connection between the element and the element is the same as that described in the previous embodiment, and will not be described again. In particular, in the embodiment, each end surface 342 of the drill lock unit is formed by the first and second inclined sections 3421, 3422, and the first inclined section 3421 is connected to the drill body. 341 is connected, and the second inclined section 3422 extends from the first inclined section 3421 to the positioning end 345, and the first inclined section 3421 of the end faces 342 is formed to meet an angle α1 which is larger than the end faces 342. The second inclined section 3422 intersects to form an angle α2, so that the end surface 342 is combined with the positioning end 345 to form a tip-shaped design having a two-stage and more outward convex shape. Further, in this embodiment, Each of the cutting edges 348 can be inclined toward the rod body 32 by the drilling edges 344, and the outer diameter r2 formed by the outwardly extending edges of the drilling edges 344 is greater than the outer diameter r1 of the rod body 32, that is, the same The junction of the cutting edge and the cutting edges 348 is formed to have a maximum outer diameter r2, which is greater than the maximum outer diameter r2 The outer diameter r1 of the body; when locking, the special pointed design formed by the positioning end 345 can be utilized to achieve the initial non-offset positioning function, when the two drilling edges 344 enter the lock member 4, That is, the characteristic that the maximum outer diameter r2 is greater than the outer diameter r1 is utilized, so that the two drill edges 344 are placed on the lock member 4, so that the two drill edges 344 and the positioning end have a three-point support positioning effect. When the positioning end 345 and the two drilling edges 344 are drilled and cut, the drilling lock stress is effectively resisted and no breakage occurs, and the drill body 341 is further driven to perform rapid drilling and cutting, and at the same time The recessed arc surface 349 is disposed to allow the chip to be discharged into the guide groove 343 without any hindrance, thereby increasing the locking speed and the fastening force of the self-drilling screw 3.
歸納前述,本新型鑽尾螺絲藉由鑽鎖單元之止擋面上形成有一凹陷弧面的設計,以將導屑空間予以擴大,避免鎖設速度因切屑受該止擋面的阻擋而影響,故不僅能有效增加導屑的順暢性外,同時該凹陷弧面的設計更可大大提高切屑的容置的效果,以免除該等鑽刃受到積存過多切屑的阻礙而降低鎖合扭力,進而達到快速鎖合等功效,故確實能達到本新型之目的。In summary, the new type of self-drilling screw has a recessed curved surface formed on the stop surface of the drill lock unit to enlarge the guide vane space, so as to prevent the lock speed from being affected by the blockage of the stop surface. Therefore, not only can the smoothness of the guide vanes be effectively increased, but also the design of the concave curved surface can greatly improve the effect of the storage of the chips, so as to prevent the drill edges from being obstructed by accumulating excessive chips and reducing the locking torque, thereby achieving Quickly lock and other effects, it can indeed achieve the purpose of this new type.
惟以上所述者,僅為說明本新型之較佳實施例而已,當不能以此限定本新型實施之範圍,即大凡依本新型申請專利範圍及新型說明書內容所作之簡單的等效變化與修飾,皆應仍屬本新型專利涵蓋之範圍內。However, the above description is only for the purpose of illustrating the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the present patent application and the contents of the new specification. All should remain within the scope of this new patent.
(習知)
1‧‧‧鑽尾螺絲
11‧‧‧螺頭
12‧‧‧桿體
13‧‧‧螺牙
14‧‧‧鑽鎖單元
141‧‧‧鑽體
142‧‧‧端面
143‧‧‧導屑溝
144‧‧‧鑽刃
145‧‧‧定位端
146‧‧‧止擋面
147‧‧‧平面
148‧‧‧切削面
2‧‧‧物件
(本創作)
3‧‧‧鑽尾螺絲
31‧‧‧螺頭
32‧‧‧桿體
33‧‧‧螺牙
34‧‧‧鑽鎖單元
341‧‧‧鑽體
342‧‧‧端面
343‧‧‧導屑溝
344‧‧‧鑽刃
345‧‧‧定位端
346‧‧‧止擋面
347‧‧‧平面
348‧‧‧切削刃
349‧‧‧凹陷弧面
3421‧‧‧第一傾斜段
3422‧‧‧第二傾斜段
α‧‧‧定位端夾角
α1‧‧‧第一傾斜段之夾角
α2‧‧‧第二傾斜段之夾角
r1‧‧‧桿體外徑
r2‧‧‧鑽刃之最大的外徑
4‧‧‧鎖合物件(known)
1‧‧‧Drilling screws
11‧‧‧ screw head
12‧‧‧ rod body
13‧‧‧ thread
14‧‧‧Drill lock unit
141‧‧‧ drill body
142‧‧‧ end face
143‧‧‧Guiding ditch
144‧‧‧Drill
145‧‧‧ Positioning end
146‧‧‧ stop surface
147‧‧‧ plane
148‧‧‧cutting surface
2‧‧‧ objects
(this creation)
3‧‧‧Drilling screws
31‧‧‧ screw head
32‧‧‧ rod body
33‧‧‧ threaded teeth
34‧‧‧Drill lock unit
341‧‧‧ drill body
342‧‧‧ end face
343‧‧‧Guiding ditch
344‧‧‧Drill
345‧‧‧ Positioning end
346‧‧‧ stop surface
347‧‧‧ plane
348‧‧‧ cutting edge
349‧‧‧ concave curved surface
3421‧‧‧First inclined section
3422‧‧‧Second inclined section α‧‧‧Angle angle α1‧‧‧An angle between the first inclined section α2‧‧‧An angle of the second inclined section
R1‧‧‧ rod outer diameter
The largest outer diameter of the r2‧‧‧ cutting edge
4‧‧‧Lock fittings
圖1是習知鑽尾螺絲之示意圖。 圖2是該習知之鎖合狀態示意圖。 圖3是本新型之第一較佳實施態樣示意圖。 圖4是該較佳實施例之局部構件放大示意圖。 圖5是該較佳實施例之鎖合狀態示意圖。 圖6是本新型之第二較佳實施之局部構件放大示意圖。Figure 1 is a schematic view of a conventional drill tail screw. Figure 2 is a schematic view of the conventional lock state. Figure 3 is a schematic view of a first preferred embodiment of the present invention. Figure 4 is an enlarged schematic view of a portion of the preferred embodiment. Figure 5 is a schematic view of the locked state of the preferred embodiment. Figure 6 is an enlarged schematic view of a partial member of a second preferred embodiment of the present invention.
3‧‧‧鑽尾螺絲 3‧‧‧Drilling screws
31‧‧‧螺頭 31‧‧‧ screw head
32‧‧‧桿體 32‧‧‧ rod body
33‧‧‧螺牙 33‧‧‧ threaded teeth
34‧‧‧鑽鎖單元 34‧‧‧Drill lock unit
341‧‧‧鑽體 341‧‧‧ drill body
342‧‧‧端面 342‧‧‧ end face
343‧‧‧導屑溝 343‧‧‧Guiding ditch
344‧‧‧鑽刃 344‧‧‧Drill
345‧‧‧定位端 345‧‧‧ Positioning end
346‧‧‧止擋面 346‧‧‧ stop surface
347‧‧‧平面 347‧‧‧ plane
348‧‧‧切削刃 348‧‧‧ cutting edge
349‧‧‧凹陷弧面 349‧‧‧ concave curved surface
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016003660U JP3206871U (en) | 2016-07-28 | 2016-07-28 | Drill screw |
Publications (1)
Publication Number | Publication Date |
---|---|
TWM540937U true TWM540937U (en) | 2017-05-01 |
Family
ID=57047693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW106200297U TWM540937U (en) | 2016-07-28 | 2017-01-06 | Self-drilling screw |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP3206871U (en) |
TW (1) | TWM540937U (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6928955B2 (en) * | 2017-10-31 | 2021-09-01 | 若井ホールディングス株式会社 | Drill screw |
-
2016
- 2016-07-28 JP JP2016003660U patent/JP3206871U/en not_active Expired - Fee Related
-
2017
- 2017-01-06 TW TW106200297U patent/TWM540937U/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
JP3206871U (en) | 2016-10-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4K | Annulment or lapse of a utility model due to non-payment of fees |