M393390 五、新型說明： 【新型所屬之技術領域】 本創作主要係揭示-種拆卸螺件之襯套，尤指 專用於拆却打圓螺件或生銹螺件之拆卸概套。 月匕 【先前技術】 ，’手工具能夠提供拆卸螺件之功效，#螺 用而=:後，螺件的角隅會因為往復受到手工具的： 後，手 硬度車父向的手工具磨耗，當螺件的角被磨圓 空轉而料完成_魏==的魏會魏件產生 拓# ί照巾華人民共和國專利申請號第96215962.W「可 幾何型面的扳手」，其將閉口扳手或套筒扳: ’成正12邊形’角頂上制有圓角，各條邊呈拱形上 遠齒，在相鄰角的拱邊上尖齒與角構成-近-&〆式，而具有能夠旋緊或旋鬆已磨損之螺栓。 古十，2種直接在閉°扳手上成形有特殊的驅動孔之設 ㈣用者必須重新添購新的扳手，而新的扳手又需要 尺寸的^規格尺寸皆須齊備’才能夠滿足驅動不同規格 之外敕，，而成為使用者一較大的經濟上的負擔，除此 外準備;工具又需要有存放空間’因此還需要額 驅動^ 國專利實施例為在㈣上成形有特殊的 之％叶，套筒的成本與體積小於完整的扳手，但是 3 M393390 添騰整組的套筒依然存有費用高的問題。 藉以 因1匕申請人希冀能夠提出一種拆卸螺件之襯套， 改善先前技術之缺失。 [新型内容】 亟欲解決先前技術所存在 本創作『拆卸螺件之襯套』 之缺失。 本創作首要提供的功效為，其材料用料遠低於套筒， 因此使用該襯套時，能夠有效降低材料成本，再者該襯套 能夠以^壓的方式成形，斜_套的成形費用遠低於套 筒，換言之，該襯套相較於傳統的套筒確實能夠滿足成本 本創作次要提供的功效為，該套接部第一段之第二端 與該承接緣之外凸角之_成—最大鮮，該最大壁厚能 夠有效增加該姆的結翻度，並防止_套產生變形。 本創作另-要提供的功效為，絲接部第—段與該承 接、康之間的壁厚大於該第二段與該承接緣之間的壁厚，令 該第-段能夠有效承擔受力，且當該襯套施力時 ，該第一 段能夠防止變形而具有較佳的結構強度。 本創作再一要提供的功效為’該襯套之高度高於扳手 之開口的厚度，且該襯套之高度高於打圓螺件之頭部厚 度’扳動時，打圓螺件、該襯套與扳手之橫截面位於同一 位置，令扳手的扳轉力能夠完全傳遞至該襯套，且該襯套 表父之扳轉力能夠完全傳遞至打圓螺件。 4 特性將從以下詳細的 '、 的優點和本創作的新穎 描述與相關的JI付圖a ;丨付圖更加顯明。 【實施方式】 佳實：=T=、手段及其功效，-較 一受二 =此僅供說明之用’在專利 觀與圖二，為本創作拆卸螺件錢套之立體外 圖。本創作之襯套1之外周面形成， 趣外凸角13’該邊11連接該内 :5亥外凸角13’該内凹角12的數量等於該外凸角 她乂ί ,且該内凹角12的數量與該外凸角13的數量之 :::於遠邊11的數量。本實施例該承接緣10呈二十四 2 ’ 3亥内凹角12的數量為十二個，該外凸烏13的數量 驅:：Γ接緣1Q也能夠設為六邊形或其他能供板手 該襯套1之内周緣形成一個套接孔2〇，其能夠套接螺 ，该套接孔20包括數個套接部21與數個閃避槽22，該 閃避槽22位於相鄰的兩個套接部21之間，本實施例中， 。亥套接部21與該閃避槽22的數量皆為六個。 ό亥套接部21包括—第—段Mi ------ ——段ZJL2與一階 ，連接段213，該第—段211包括第一端2ln與第二端 ⑴，該第二段212包括第—端2121與第二端2122，該 M393390 第一段211的第一端2111連接該閃避槽22,該第一段211 的第二端2112與該第二段212的第一端2121位於該階級 連接段213的兩端，該第二段212的第二端2122連接該另 一閃避槽22，該閃避槽22呈弧型而沒有應力集中的問題。 該襯套1包括一虛擬圓心0，該虛擬圓心0至該第一 段211之第二端2112的距離L1為該虛擬圓心0至該套接 孔20的最小距離。該虛擬圓心0至該閃避槽22之間的距 離L2為該虛擬圓心0至該套接孔20的最大距離。 同時參照圖三，該階級連接段213對應該外凸角13， 該閃避槽22也對應該外凸角13，該第一段211之第二端 2112與該承接緣10之外凸角13之間形成一最大壁厚D1， 該最大壁厚D1能夠有效增加該襯套1的結構強度，並防止 該襯套1產生變形。 該襯套1藉由該内凹角12的數量等於該外凸角13的 數量等於該套接部21的數量之兩倍，而能夠形成該最大壁 厚D卜 該最大壁厚D1大於該第二段212之第一端2121垂直 延伸至該承接緣10的距離D2。該第二段212之第二端2122 垂直延伸至該承接緣10的距離D4小於該第一段211之第 一端2111垂直延伸至該承接緣10的距離D3。換言之，該 第一段211與該承接緣10之間的壁厚大於該第二段212 與該承接緣10之間的壁厚，令該第一段211能夠有效承擔 受力，且當該襯套1施力時，該第一段211能夠防止變形 而具有較佳的結構強度。 6 M393390 參照圖四與圖五，為本創作襯套拆卸 =:圖。該襯套1搭配開嗜手咖能夠S |、3。製成_套！之材料用料遠低於製成相同號 太、之套筒，因此使用該襯套i時，能夠有效降低材料 成本，再者該縣〗能夠以沖_方式成形，而令該概套 的成形餘㈣遠低於㈣，射之，該襯套丨相較於 傳統的套料實能夠滿足成本低廉的要求。 、M393390 V. New description: [New technical field] This creation mainly reveals the bushing for removing the screw, especially the disassembly sleeve specially used for removing the round screw or the rust screw.月匕 [Prior Art], 'Hand tools can provide the effect of disassembling the screw. #螺用和:: After the screw, the corner of the screw will be affected by the reciprocating hand tool: After the hand hardness, the hand tool wear of the hand When the corner of the screw is rounded and idling, the material is finished. _Wei==Weihui Wei pieces produce extension # ί照巾, People's Republic of China Patent Application No. 96215962.W "Geometric wrench", which will close Wrench or sleeve wrench: 'The positive 12-sided' corner has rounded corners on the top, each side has an arched upper tooth, and the sharp teeth and corners on the adjacent side arches form a near-& Has the ability to tighten or loosen the worn bolts. Ancient ten, two kinds of special drive holes are formed directly on the closed wrench. (4) The user must re-purchase the new wrench, and the new wrench needs to be of the size and size required to be able to meet the different driving requirements. Beyond the specifications, it becomes a large economic burden for the user, except for the preparation; the tool needs to have a storage space. Therefore, the amount of the drive is required. The patent example is a special % formed on (4). The cost and volume of the sleeve and sleeve are smaller than the full wrench, but the 3 M393390 has a high cost problem. Therefore, it is hoped that the applicant can propose a bushing for removing the screw to improve the lack of prior art. [New content] I want to solve the problem of the prior art. The creation of the "Blade for removing screws" is missing. The primary function of this creation is that the material used is much lower than the sleeve, so when the bushing is used, the material cost can be effectively reduced, and the bushing can be formed by pressing, and the forming cost of the oblique sleeve Far less than the sleeve, in other words, the bushing can indeed meet the cost of the present invention compared to the conventional sleeve. The second end of the first section of the socket is lobed outside the bearing edge. The maximum thickness is such that the maximum wall thickness can effectively increase the knot degree of the dam and prevent the _ sleeve from being deformed. The effect of the present invention is to provide that the wall thickness between the first section of the wire joint and the socket and the wall is greater than the wall thickness between the second section and the bearing edge, so that the first section can effectively bear the force And when the bushing is applied, the first segment can prevent deformation and has better structural strength. The effect of the creation of the creation is that the height of the bushing is higher than the thickness of the opening of the wrench, and the height of the bushing is higher than the thickness of the head of the round screw member, and the screw is screwed. The bushing and the cross-section of the wrench are in the same position, so that the wrench's pulling force can be completely transmitted to the bushing, and the bushing table parent's turning force can be completely transmitted to the rounding screw. 4 The characteristics will be more apparent from the following detailed ', advantages and novel descriptions of this creation and related JI diagrams; [Embodiment] Good: =T=, means and its effect, - one is more than two = this is for illustrative purposes only. In the patent view and Figure 2, it is a three-dimensional external view of the dismantling screw. The outer peripheral surface of the bush 1 of the present invention is formed, and the outer corner 13' is connected to the inner side: 5 outer convex corner 13', the number of inner concave corners 12 is equal to the outer convex angle, and the inner concave angle The number of 12 and the number of the outer lobes 13::: the number of the far side 11. In this embodiment, the receiving edge 10 has twelve concave numbers 12 in the shape of twenty-two 2'3, and the number of the outer convex portions 13 is driven: the connecting edge 1Q can also be set as a hexagon or other can be provided. The inner periphery of the bushing 1 defines a sleeve hole 2 〇 which can be sleeved with a screw. The sleeve hole 20 includes a plurality of socket portions 21 and a plurality of evasing grooves 22, and the evasing grooves 22 are located adjacent to each other. Between the two socket portions 21, in this embodiment. The number of the flushing portion 21 and the dodging groove 22 is six. The 套 套 21 21 includes a first segment, a segment Z L —— a segment ZJL2, and a first segment, a connecting segment 213, the first segment 211 includes a first end 2ln and a second end (1), the second segment The first end 2111 of the first segment 211 of the M393390 is connected to the dodging slot 22, and the second end 2112 of the first segment 211 and the first end 2121 of the second segment 212 are connected to the second end 2121. Located at both ends of the class connecting section 213, the second end 2122 of the second section 212 is connected to the other dodging groove 22, and the dodging groove 22 has an arc shape without a problem of stress concentration. The bushing 1 includes a virtual center 0, and the distance L1 from the virtual center 0 to the second end 2112 of the first segment 211 is the minimum distance from the virtual center 0 to the socket 20. The distance L2 between the virtual center 0 and the dodge slot 22 is the maximum distance from the virtual center 0 to the socket hole 20. Referring to FIG. 3 at the same time, the class connecting section 213 corresponds to the outer corner 13 , and the dodging groove 22 also corresponds to the outer corner 13 . The second end 2112 of the first section 211 and the outer corner 13 of the receiving edge 10 A maximum wall thickness D1 is formed, which can effectively increase the structural strength of the bushing 1 and prevent deformation of the bushing 1. The bushing 1 can form the maximum wall thickness D by the number of the inner concave corners 12 equal to the number of the outer convex corners 13 being equal to twice the number of the socket portions 21, and the maximum wall thickness D1 is greater than the second The first end 2121 of the segment 212 extends perpendicularly to the distance D2 of the receiving edge 10. The distance D4 of the second end 2122 of the second section 212 extending perpendicularly to the receiving edge 10 is less than the distance D3 of the first end 2111 of the first section 211 extending perpendicularly to the receiving edge 10. In other words, the wall thickness between the first section 211 and the receiving edge 10 is greater than the wall thickness between the second section 212 and the receiving edge 10, so that the first section 211 can effectively bear the force, and when the liner When the sleeve 1 is applied, the first segment 211 can prevent deformation and has better structural strength. 6 M393390 Refer to Figure 4 and Figure 5 for the removal of the creative bushing =: diagram. This bushing 1 can be used with S-, and 3. Made into _ sets! The material used is much lower than the sleeve made of the same number. Therefore, when the bushing i is used, the material cost can be effectively reduced, and the county can be formed in a punching manner to form the jacket. Yu (4) is far lower than (4), shot, the bushing can meet the low cost requirements compared with the traditional nesting. ,
本實施例中，该襯套！之高度高於開口型板手2的厚 又’且該概套1之高度高於打圓螺件3之頭部的厚度。扳 手2之開口 200套接該襯套！之承接緣1〇，該襯套i之套 接孔20套接於打圓螺件3，因此扳動時，打圓螺件3、該 襯套1 ”扳手2位於同一虛擬橫截面β，令扳手2的扳轉 力能夠完全傳遞至該概套卜且該襯套1承受之扳轉力能 夠完全傳遞至打圓螺件3。In this embodiment, the bushing! The height is higher than the thickness of the open type wrench 2 and the height of the set 1 is higher than the thickness of the head of the round screw 3. The opening of the wrench 2 200 sleeves the bushing! The socket hole 20 of the bushing i is sleeved on the rounding screw 3, so when the wrench is turned, the round screw 3 and the bushing 1 "wrench 2 are located on the same virtual cross section β, The turning force of the wrench 2 can be completely transmitted to the set and the pulling force of the bushing 1 can be completely transmitted to the rounding screw 3.
立爹照圖六，為本創作扳手藉由襯套驅動打圓螺件之示 意圖。該襯套1之承接緣10設有十二個内凹角12與十二 個外&角13時，開口型扳手2之開σ調具有相對的兩個 叹合面210，每一咬合面21〇能夠咬合有兩個外凸角a， 因此扳手2能夠確實驅動該襯套1轉動。 ό玄襯套1之套接孔2〇套接打圓螺件3，該襯套1之套 接部21對應於打圓螺件3之邊31〇，該閃避槽22對應於 打圓螺件3之角320 ’該套接部21之第一段2π接觸於打 圓螺件3之邊310，且該第一段211之第二端2112咬合於 邊310。該套接部21之第二段212未接觸於打圓螺件3之 7 M393390 邊 310。 該閃避槽22能夠容納打圓螺件3之角320，而能夠避 免扳轉打圓螺件3時，扳轉力量過大而使打圓螺件3之角 320產生更嚴重的打圓或崩牙。 當開口型扳手2扳轉而拆卸打圓螺件3時，該襯套1 之六個套接部21的第一段211之第二端2112咬合著邊310 而形成六個咬合點A，藉由該六個咬合點A咬合於打圓螺 件3，而令該襯套1確實的咬合打圓螺件3，且持續扳轉開 口型扳手2，而能夠順利拆卸打圓螺件3。 參照圖七，為本創作概套驅動生錄螺件之動作圖。該 襯套1也能夠驅動生銹螺件4，一般螺件的硬度小於扳動 工具，因此扳動工具驅動螺件時，才會發生螺件受到過大 的扳轉力量，而讓螺件形成打圓。 生銹螺件4因為遭受到繡蝕，因此生銹螺件4的表面 形成繡蝕面，而讓生銹螺件4表面的硬度低於一般螺件。 當開口型扳手2套接該襯套1，且該襯套1之套接孔20套 接生銹螺件4，該襯套1之套接部21對應於生銹螺件4之 邊410，該閃避槽22對應於生銹螺件4之角420，該套接 部21之第一段211接觸於生銹螺件4之邊410，且該第一 段211之第二端2112咬合於邊410。 當開口型扳手2扳轉而拆卸生銹螺件4時，該襯套1 之六個套接部21的第一段211之第二端2112咬合著邊 41Ϊ)，且第一段211之第二端2112並伸入於邊410，而形 成六個咬合點A，藉由該六個咬合點A咬合於生錄螺件4， 8 M393390 而令該襯套1確實的咬合生錄螺件4，且持續扳轉開口型 扳手2，能夠順利拆卸生銹螺件4。 麥照圖A ’為本創作襯套驅動打圓螺件之示意圖。該 襯套1也能夠配合使用於梅花型扳手5，梅花型扳手5之 驅動孔具有十二個内凹咬合面51()與十二個外凸咬合 面520，梅花型扳手5之驅動孔5〇〇套接該襯套工之承接 緣10 ’梅花型扳手5之内凹咬合面51〇對應於該概套ι之 外凸角13梅匕型扳手5之外凸咬合面52〇對應於該概套 1之内凹肖12’每-咬合面51〇、52()能夠咬合於外凸角 13與内凹角12，因此扳手5能夠碟實驅動該襯套}轉動。 就以上所述可以歸納出本創作具有以下之優點： 〜1.本創作『拆卸螺件之襯套』’其材料用料遠低於套 甸’因此使用該襯套時，能夠有效降低材料成本，再者該 襯套=夠以㈣的方式成形’而令該襯套的成形費用遠低 於套筒才奐。之’该襯套相較於傳統的套筒確實能夠滿足 成本低廉的要求。 z.本創作拆卸螺件之襯套 ,,食』，砂-去1任部弗一权之第二 ^與該承接緣之外凸肖之間形成—最大壁厚，該最大壁厚 句有放曰加。亥襯套的結構強度，並防止該襯套產生變形。 3. 本創作『拆卸螺件之概套』，該套接部第一段與該承 ^之間的鮮大於該第二段無承接緣之間的壁厚，人 =第一段能夠有效承擔受力，且當該襯套施力時，該第— &能夠防止變形而具有較佳的結構強度。 4. 本創作『拆卸螺件之襯套』，該襯套之高度高於扳手 9 的厚度，且該襯套之高度高於螺件之頭部厚声， 1圓螺件、該襯套與扳手之橫截面位於同反動時’ 的扳轉力能夠完全傳遞至該襯套，a該襯套f ’令板手 能夠完全傳遞至打圓螺件。 又文扳轉力 丨地有，里两个剧忭之較佳實施例 . ^限定本創作m圍，故舉域值二二不射 件之置換，或依本創作申請專利範 === 飾，皆應㈣柄型專獅蓋H乍之^變化與修 【圖式簡單說明】 圖一 圖二 圖三 圖izg 圖五 圖六 圖〇 .為本創作拆卸螺件之襯套之立體外觀圖。 .為本創作拆卸螺件之襯套之剖面圖。 :為本創作由ϋ二所取之細部放大圖。 ..為本創作襯鱗卸螺件之立體外觀圖。 .為本創作轉拆卸螺件之剖面圖。 :為本創作開口型扳手藉_套驅動打圓螺件之示意 圖七：為本創作開 圖。 垔扳手藉由襯套驅動生銹螺件之動作 圖八：為本創作梅 圖。 - 化型扳手藉由襯套驅動打 圓螺件之示意 【主要元件符號說明】 1 襯套 M393390According to Figure 6, the design of the wrench is driven by a bushing to drive the screw. When the receiving edge 10 of the bushing 1 is provided with twelve concave corners 12 and twelve outer & angles 13, the opening yoke of the open-ended wrench 2 has two opposite slanting faces 210, and each occlusal surface 21 The cymbal can be engaged with two outer lobes a, so that the wrench 2 can surely drive the bush 1 to rotate. The sleeve hole 2 of the ό bushing 1 is sleeved with the round screw member 3. The sleeve portion 21 of the bushing 1 corresponds to the side 31〇 of the round screw member 3, and the dodge groove 22 corresponds to the round screw member The first segment 2π of the socket portion 21 is in contact with the side 310 of the rounding screw 3, and the second end 2112 of the first segment 211 is engaged with the edge 310. The second section 212 of the socket portion 21 is not in contact with the 7 M393390 side 310 of the rounding screw member 3. The dodging groove 22 can accommodate the corner 320 of the rounding screw 3, and can avoid the excessively large pulling force when the rounding screw 3 is turned over, so that the corner 320 of the rounding screw 3 produces a more serious rounding or disintegration. . When the split wrench 2 is turned to disassemble the round screw 3, the second end 2112 of the first segment 211 of the six sleeve portions 21 of the bushing 1 engages the edge 310 to form six bite points A, The six occlusal points A are engaged with the round screw member 3, so that the bushing 1 is surely engaged with the round screw member 3, and the open-type wrench 2 is continuously turned, and the round screw member 3 can be smoothly removed. Referring to FIG. 7 , an action diagram of the driving and recording screw of the creation set is provided. The bushing 1 can also drive the rusting screw member 4. Generally, the hardness of the screw member is smaller than that of the pulling tool. Therefore, when the tool is driven to drive the screw member, the screw member is subjected to excessive pulling force, and the screw member is formed. circle. Since the rust screw 4 is subjected to embroidering, the surface of the rust screw 4 forms an embedding surface, and the surface of the rust screw 4 has a lower hardness than the general screw. When the open type wrench 2 is sleeved with the bushing 1 and the sleeve hole 20 of the bushing 1 is sleeved with the rust screw 4, the sleeve portion 21 of the bushing 1 corresponds to the side 410 of the rust screw 4, The doffing slot 22 corresponds to the corner 420 of the rusting screw 4, the first segment 211 of the socket portion 21 is in contact with the side 410 of the rusting screw 4, and the second end 2112 of the first segment 211 is engaged with the edge 410. . When the split wrench 2 is turned to disassemble the rust screw 4, the second end 2112 of the first segment 211 of the six socket portions 21 of the bushing 1 engages the edge 41Ϊ), and the first segment 211 is The two ends 2112 extend into the side 410 to form six occlusal points A, and the six occlusal points A are engaged with the recording screw 4, 8 M393390 so that the bushing 1 is surely engaged with the raw screw 4 And the open type wrench 2 is continuously turned, and the rust screw 4 can be smoothly removed. Mai Zhaotu A ' is a schematic diagram of the creative bushing driving round screw. The bushing 1 can also be used in combination with a Phillips wrench 5, and the driving hole of the Phillips wrench 5 has twelve concave occlusal faces 51() and twelve convex occlusal faces 520, and the driving hole 5 of the Phillips wrench 5 〇〇 该 该 衬套 衬套 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' The inner visor 12's occlusal surfaces 51A, 52() can be engaged with the outer lobes 13 and the inner concave corners 12, so that the wrench 5 can drive the bushing} to rotate. As far as the above is concerned, it can be concluded that the creation has the following advantages: ~1. The creation of the "claw for removing the screw" is much lower than that of the plastic material. Therefore, when the bushing is used, the material cost can be effectively reduced. Furthermore, the bushing = enough to be formed in the manner of (4) makes the forming cost of the bushing much lower than that of the sleeve. The bushing does meet the low cost requirements of conventional bushings. z. The sleeve of the creation of the screw, the food, the sand-to-one part of the second part of the Fu-the right and the convex edge of the bearing edge formed - the maximum wall thickness, the maximum wall thickness sentence Let go. The structural strength of the bushing and the deformation of the bushing. 3. The creation of the "assembly of the screw", the gap between the first section of the socket and the bearing is greater than the thickness of the second section without the bearing edge, the person = the first paragraph can effectively bear Forced, and when the bushing is applied, the first & can prevent deformation and have better structural strength. 4. The creation of the "screw bushing", the height of the bushing is higher than the thickness of the wrench 9, and the height of the bushing is higher than the thickness of the head of the screw, 1 round screw, the bushing and When the cross section of the wrench is in the same reaction state, the turning force can be completely transmitted to the bushing, and the bushing f' enables the wrench to be completely transmitted to the rounding screw. There is also a better example of the two dramas in the text. ^There is a limit on the creation of the creation, so the domain value is not replaced by the second or second, or the patent application is based on this creation === , all should be (four) shank type lion cover H 乍 ^ change and repair [schematic description] Figure 1 Figure 2 Figure 3 izg Figure 5 Figure 6 〇. This is the creation of the disassembly of the bushing of the three-dimensional appearance . A cross-sectional view of the bushing for the creation of the screw. : This is an enlarged view of the details taken by Yu Er. .. is a three-dimensional appearance of the lining of the scale. A cross-sectional view of the dismantling screw of the original creation. : For the creation of the open-end wrench borrowing _ set drive to screw the screw figure Figure 7: for the creation of the map. The action of the 垔 wrench to drive the rusted screw by the bushing Figure 8: The original meditation. - Schematic diagram of the wrench to drive the round screw by the bushing [Main component symbol description] 1 Bushing M393390
10 承接緣 11 邊 12 内凹角 13 外凸角 20 套接孔 21 套接部 211 第一段 2111第一端 2112第二端 212 第二段 2121第一端 2122第二端 213 階級連接段 22 閃避槽 2 扳手 200 開口 210 咬合面 3 打圓螺件 310 邊 320 角 4 生錄螺件 410 邊 420 角 5 板手 500 驅動孔 510 内凹咬合面 520 外凸咬合面 0 虛擬圓心 L1 距離 L2 距離 D1 最大壁厚 D2 距離 D3 距離 D4 距離 A 咬合點 B 虛擬橫截面10 receiving edge 11 edge 12 inner concave corner 13 outer lobe 20 socket 21 ferrule 211 first section 2111 first end 2112 second end 212 second section 2121 first end 2122 second end 213 class connection section 22 dodge Slot 2 Wrench 200 Opening 210 Occluding surface 3 Rounding screw 310 Edge 320 Angle 4 Raw screw 410 Side 420 Angle 5 Wrench 500 Drive hole 510 Concave occlusal surface 520 External occlusal surface 0 Virtual center L1 Distance L2 Distance D1 Maximum wall thickness D2 distance D3 distance D4 distance A occlusal point B virtual cross section