TWI838297B

TWI838297B - Swing tool

Info

Publication number: TWI838297B
Application number: TW112125312A
Authority: TW
Inventors: 陳國隆
Original assignee: 豐造工業股份有限公司
Filing date: 2023-07-06
Publication date: 2024-04-01

Abstract

A swing tool is provided, including a body, a driving head and a positioning mechanism. The drive head is rotatably pivoted to the body. The positioning mechanism is movably arranged on the body. The positioning mechanism includes a positioning member and a control member, wherein the control member and the positioning member are laterally abutting each other to form an interlocking relationship. The control member comprises a recessed groove and multiple protrusions. When the control member moves to accommodate a portion of the positioning member within the recessed groove, the positioning member disengages from the driving head, allowing the driving head to rotate freely. When the control member moves to push the multiple protrusions against the positioning member, the positioning member moves closer to the driving head to securely position the driving head.

Description

搖頭工具Shaking tool

本發明係與手工具有關，特別是有關於一種搖頭工具，頭部可相對身部擺動定位。The present invention relates to hand tools, and in particular to a tool with a swinging head, wherein the head can be swung and positioned relative to the body.

相對於一體式扳手來說，搖頭工具透過頭部可相對身部於一定角度內擺動，而可以靈活地伸入一體式扳手難以到達的地方進行旋動作業，常見於汽修環境、機械加工環境。而頭部相對身部之好處除了伸入難以到達的位置之外，更可隨使用者需求調整相對角度進行施力，而有省時省力之功效，如所揭露的搖頭工具即屬此類。Compared to a one-piece wrench, a swing tool can swing its head relative to the body within a certain angle, and can flexibly reach into places that are difficult for a one-piece wrench to reach for rotational operations. It is commonly seen in auto repair environments and mechanical processing environments. The advantage of the head relative to the body is that in addition to reaching into hard-to-reach locations, the relative angle can be adjusted according to the user's needs to apply force, which saves time and effort. The swing tool disclosed belongs to this category.

然而，現有的搖頭工具其用來定位住頭部的定位機構存在有瑕疵，明確地說，控制件與定位件相互接觸的推抵面通常為斜面，因此，當頭部於實際轉動過程中若受到較大阻力時，常導致定位件反向推動控制件移動至釋放位置，造成頭部非預期釋放而相對身部轉動，使用者無法順利穩定進行旋動作業。However, the positioning mechanism of the existing rocking head tool for positioning the head has defects. Specifically, the contact surfaces between the control member and the positioning member are usually inclined. Therefore, when the head encounters greater resistance during the actual rotation process, the positioning member often pushes the control member in the opposite direction to move to the release position, causing the head to be unexpectedly released and rotate relative to the body, and the user cannot perform the rotation operation smoothly and stably.

因此，有必要提供一種新穎且具有進步性之搖頭工具，以解決上述之問題。Therefore, it is necessary to provide a novel and advanced shaking head tool to solve the above-mentioned problems.

本發明之主要目的在於提供一種搖頭工具，透過階狀遞升的複數頂凸部可以有效增加控制件對定位件的推抵穩定度，於使用時定位件無法輕易反向推動控制件移動至釋放位置。The main purpose of the present invention is to provide a rocker tool, which can effectively increase the pushing stability of the control member against the positioning member through multiple stepped convex parts, so that the positioning member cannot easily push the control member in the opposite direction to move to the release position during use.

為達成上述目的，本發明提供一種搖頭工具，包括：一身部、一驅動頭及一定位機構。該驅動頭可轉動地連接該身部；該定位機構包含有一定位件及一控制件，該定位件可沿一第一方向移動地設於該身部，該控制件可沿橫向該第一方向移動於一鎖定位置及一釋放位置地設於該身部，該控制件與該定位件相互抵靠而成連動關係，該控制件於與該定位件相抵靠之一側設有一容凹槽及複數頂凸部，該容凹槽與該複數頂凸部係沿該控制件之移動方向排列，且該複數頂凸部係朝向遠離該容凹槽之方向呈階狀遞升；其中，當該控制件位於該釋放位置時，該定位件可伸入該容凹槽以遠離釋放該驅動頭，該驅動頭可自由轉動，當該控制件從該釋放位置移動至該鎖定位置時，該定位件脫離該容凹槽且受該複數頂凸部之推抵而朝向該驅動頭靠近，以定位住該驅動頭使其無法轉動。To achieve the above-mentioned purpose, the present invention provides a rocking tool, comprising: a body, a driving head and a positioning mechanism. The driving head is rotatably connected to the body; the positioning mechanism includes a positioning member and a control member, the positioning member is movably arranged on the body along a first direction, the control member is movably arranged on the body along the first direction in a locking position and a releasing position, the control member and the positioning member are mutually abutted to form a linkage relationship, the control member is provided with a receiving groove and a plurality of convex parts on one side abutting against the positioning member, the receiving groove and the plurality of convex parts are arranged along the control member. The control member is arranged in a moving direction of the workpiece, and the plurality of convex portions are stepped upward in a direction away from the receiving groove; wherein, when the control member is located at the release position, the positioning member can extend into the receiving groove to release the driving head away, and the driving head can rotate freely; when the control member moves from the release position to the locking position, the positioning member is separated from the receiving groove and is pushed by the plurality of convex portions to approach the driving head, so as to position the driving head so that it cannot rotate.

以下僅以實施例說明本發明可能之實施態樣，然並非用以限制本發明所欲保護之範疇，文中所提之名詞前冠以的「一」或「至少一」並非對數量進行限制，依據需求亦可為「複數」個，此數量上之變化亦為所欲保護之範圍，合先敘明。The following examples are merely used to illustrate possible implementations of the present invention, but are not intended to limit the scope of protection of the present invention. The "one" or "at least one" preceding the terms mentioned in the text does not limit the quantity, and it can also be "plural" according to needs. This change in quantity is also within the scope of protection, which should be explained in advance.

請參考圖1至圖9，其顯示本發明之一實施例，本發明之搖頭工具包括：一身部1、一驅動頭2及一定位機構3。Please refer to FIG. 1 to FIG. 9 , which show an embodiment of the present invention. The rocking tool of the present invention includes: a body 1 , a driving head 2 and a positioning mechanism 3 .

該驅動頭2可轉動地連接該身部1。該定位機構3包含有一定位件31及一控制件32，該定位件31可沿一第一方向6移動地設於該身部1，該控制件32可沿橫向該第一方向6移動於一鎖定位置及一釋放位置地設於該身部1，該控制件32與該定位件31相互抵靠而成連動關係，該控制件32於與該定位件31相抵靠之一側設有一容凹槽331及複數頂凸部332，該容凹槽331與該複數頂凸部332係沿該控制件32之移動方向排列，且該複數頂凸部332係朝向遠離該容凹槽331之方向呈階狀遞升。The driving head 2 is rotatably connected to the body 1. The positioning mechanism 3 includes a positioning member 31 and a control member 32. The positioning member 31 is movably disposed on the body 1 along a first direction 6. The control member 32 is movably disposed on the body 1 along the transverse first direction 6 to a locking position and a releasing position. The control member 32 and the positioning member 31 abut against each other to form a linkage relationship. The control member 32 is provided with a receiving groove 331 and a plurality of convex portions 332 on one side abutting against the positioning member 31. The receiving groove 331 and the plurality of convex portions 332 are arranged along the moving direction of the control member 32, and the plurality of convex portions 332 are stepped upward in a direction away from the receiving groove 331.

其中，當該控制件32位於該釋放位置時，該定位件31可伸入該容凹槽331以遠離釋放該驅動頭2，該驅動頭2可自由轉動；而當該控制件32從該釋放位置移動至該鎖定位置時，該定位件31脫離該容凹槽331且受該複數頂凸部332之推抵而朝向該驅動頭2靠近，以定位住該驅動頭2使其無法轉動。When the control member 32 is located at the release position, the positioning member 31 can extend into the receiving groove 331 to release the drive head 2 away, and the drive head 2 can rotate freely; and when the control member 32 moves from the release position to the locking position, the positioning member 31 is separated from the receiving groove 331 and is pushed by the multiple top protrusions 332 to approach the drive head 2, so as to position the drive head 2 so that it cannot rotate.

較佳地，該定位機構3另包含有一彈性件38，該彈性件38彈抵於該身部1與該控制件32之間，該彈性件38驅使該控制件32常態地具有朝向該鎖定位置移動之趨勢，令該控制件32未受外力作用時可自動回復至該鎖定位置，能有效提升操作安全性。Preferably, the positioning mechanism 3 further includes an elastic member 38, which elastically abuts between the body 1 and the control member 32. The elastic member 38 drives the control member 32 to normally have a tendency to move toward the locking position, so that the control member 32 can automatically return to the locking position when no external force is applied, which can effectively improve operational safety.

該定位機構3另包含有複數定位槽36，該複數定位槽36環間隔環繞於該驅動頭2，該定位件31包含有一柱體311及二凸肋312，該二凸肋312分別凸設於該柱體311之相對二端，且該二凸肋312之延伸方向係相互垂直，一該凸肋312嵌入一該定位槽36以定位住該驅動頭2，另一該凸肋312抵靠於該控制件32。於本實施例中，該二凸肋312之結構形狀相同，能簡化加工複雜度，且該柱體311與各該凸肋312較佳係一體成型，而能有較強之結構強度，其中，該柱體311呈圓柱狀，各該凸肋312呈等腰直角三角柱狀，各該凸肋312遠離該柱體311的一端有進行倒角，與其他元件接觸時可以減少應力集中。The positioning mechanism 3 further includes a plurality of positioning grooves 36, which are arranged around the drive head 2 at intervals. The positioning member 31 includes a column 311 and two ribs 312, which are respectively protruded at two opposite ends of the column 311, and the extension directions of the two ribs 312 are perpendicular to each other. One of the ribs 312 is embedded in one of the positioning grooves 36 to position the drive head 2, and the other rib 312 is against the control member 32. In this embodiment, the two ribs 312 have the same structural shape, which can simplify the processing complexity, and the column 311 and each rib 312 are preferably formed as a whole, so as to have a stronger structural strength. Among them, the column 311 is cylindrical, and each rib 312 is in the shape of an isosceles right-angled triangular column. Each rib 312 has a chamfered end away from the column 311, which can reduce stress concentration when contacting other components.

具體地說，該控制件32為銷件，各該頂凸部332呈齒狀，該複數頂凸部332為沿一虛擬斜平面5延伸之齒條結構，該虛擬斜平面5與該控制件32之軸向夾設有一第一夾角41，該第一夾角41小於45度。更具體地說，該複數頂凸部332界定出複數齒槽33，各該齒槽33之形狀相同，各該齒槽33於該虛擬斜平面5之延伸方向上的相對二側分別設有一第一槽壁341及一第二槽壁342，該第一槽壁341較該第二槽壁342靠近該容凹槽331，該第一槽壁341與該第二槽壁342共同界定出該齒槽33且夾設一鈍角，以令各該齒槽33有較充足的裕度空間容納該凸肋312之部分。Specifically, the control member 32 is a pin, each of the top protrusions 332 is tooth-shaped, and the multiple top protrusions 332 are tooth structures extending along a virtual inclined plane 5. The virtual inclined plane 5 and the control member 32 are axially clamped at a first angle 41, and the first angle 41 is less than 45 degrees. More specifically, the plurality of top protrusions 332 define a plurality of tooth grooves 33, each of which has the same shape. Each of the tooth grooves 33 is provided with a first groove wall 341 and a second groove wall 342 on two opposite sides in the extension direction of the virtual inclined plane 5, respectively. The first groove wall 341 is closer to the receiving groove 331 than the second groove wall 342. The first groove wall 341 and the second groove wall 342 jointly define the tooth groove 33 and sandwich a blunt angle so that each of the tooth grooves 33 has sufficient margin space to accommodate part of the convex rib 312.

呈階狀遞升的該複數頂凸部332能強化該定位件31移動過程產生的階段感讓使用者得知，並能於該第一方向6上確實提供正向抵靠面予該定位件31之凸肋312進行壓抵，以減少分力之產生，提升保持位置定位之穩定性而不易相互滑移。值得一提的是，該第一槽壁341較佳沿翹離該控制件32之軸向的方向延伸，如此一來，當該驅動頭2反向推動該定位件31朝向該容凹槽331移動時，翹起的該第一槽壁341能阻礙該定位件31之移動，因該定位件31沿該第一槽壁341往該容凹槽331方向移動時，該定位件31反而會更伸入該定位槽36以抵禦來自該驅動頭2之作用力，而有防止反向跳脫之功效；其中，該第一槽壁341與該控制件32之軸向夾設有一第二夾角42，該第二夾角42小於15度。The multiple convex parts 332 that ascend in a stepped manner can enhance the stage sense generated during the movement of the positioning member 31 so that the user can know it, and can provide a positive abutment surface in the first direction 6 for the convex rib 312 of the positioning member 31 to press against it, so as to reduce the generation of component force, improve the stability of maintaining the position and prevent mutual slippage. It is worth mentioning that the first groove wall 341 preferably extends in the axial direction away from the control member 32. In this way, when the drive head 2 pushes the positioning member 31 in the reverse direction toward the receiving groove 331, the raised first groove wall 341 can hinder the movement of the positioning member 31. Because when the positioning member 31 moves along the first groove wall 341 toward the receiving groove 331, the positioning member 31 will extend further into the positioning groove 36 to resist the force from the drive head 2, thereby preventing reverse jumping off; wherein, the first groove wall 341 and the control member 32 are axially clamped with a second clamping angle 42, and the second clamping angle 42 is less than 15 degrees.

於本實施例中，該控制件32另包含有一開放式之凹室35，該凹室35係沿該控制件32之徑向凹陷，該容凹槽331係凹設於該凹室35之底壁，該複數頂凸部332係凸設於該凹室35之底壁；其中，該複數頂凸部332於該控制件32之徑向上未凸出該控制件32之外輪廓，以確保該複數頂凸部332不會與周遭元件產生磨耗。以另一角度觀之，該容凹槽331係凹設於一基準面37，該基準面37即為該凹室35之底壁，該複數頂凸部332係凸設於該基準面37，該容凹槽331至該基準面37最遠的垂直距離與該複數頂凸部332至該基準面37最遠的垂直距離的比值介於0.4至0.6之間，以確保該容凹槽331與該複數頂凸部332有較適當的結構比例。In this embodiment, the control member 32 further includes an open recessed chamber 35, which is recessed along the radial direction of the control member 32, the receiving groove 331 is recessed in the bottom wall of the recessed chamber 35, and the plurality of convex portions 332 are convexly disposed on the bottom wall of the recessed chamber 35; wherein the plurality of convex portions 332 do not protrude beyond the outer contour of the control member 32 in the radial direction of the control member 32 to ensure that the plurality of convex portions 332 will not generate wear with surrounding components. Viewed from another angle, the receiving groove 331 is recessed in a reference plane 37, and the reference plane 37 is the bottom wall of the recessed chamber 35. The plurality of convex portions 332 are convexly disposed on the reference plane 37. The ratio of the farthest vertical distance from the receiving groove 331 to the reference plane 37 to the farthest vertical distance from the plurality of convex portions 332 to the reference plane 37 is between 0.4 and 0.6, so as to ensure that the receiving groove 331 and the plurality of convex portions 332 have a more appropriate structural ratio.

1:身部1: Body

2:驅動頭2:Drive head

3:定位機構3: Positioning mechanism

31:定位件31: Positioning piece

311:柱體311: Column

312:凸肋312: ribs

32:控制件32: Control parts

331:容凹槽331: Recess

332:頂凸部332: Top convex part

33:齒槽33: Tooth

341:第一槽壁341: First groove wall

342:第二槽壁342: Second groove wall

35:凹室35: Alcove

36:定位槽36: Positioning slot

37:基準面37: Base plane

38:彈性件38: Elastic parts

41:第一夾角41: First angle

42:第二夾角42: Second angle

5:虛擬斜平面5: Virtual inclined plane

6:第一方向6: First Direction

圖1為本發明一實施例之立體圖。圖2為圖1之分解圖。圖3為本發明一實施例之控制件位於鎖定位置之局部剖面放大圖。圖4為本發明一實施例之控制件位於釋放位置之局部剖面放大圖。圖5為本發明一實施例之驅動頭相對身部轉動之示意圖。圖6為本發明一實施例之控制件之正視圖。圖7為圖6之局部放大圖。圖8為本發明一實施例之定位件之立體圖。圖9為圖8之正視圖。 Figure 1 is a three-dimensional diagram of an embodiment of the present invention. Figure 2 is an exploded view of Figure 1. Figure 3 is an enlarged partial cross-sectional view of a control member of an embodiment of the present invention in a locked position. Figure 4 is an enlarged partial cross-sectional view of a control member of an embodiment of the present invention in a released position. Figure 5 is a schematic diagram of the rotation of the drive head relative to the body of an embodiment of the present invention. Figure 6 is a front view of the control member of an embodiment of the present invention. Figure 7 is a partial enlarged view of Figure 6. Figure 8 is a three-dimensional view of a positioning member of an embodiment of the present invention. Figure 9 is a front view of Figure 8.

32:控制件 32: Control parts

331:容凹槽 331: Recessed groove

332:頂凸部 332: Top convex part

35:凹室 35: Alcove

37:基準面 37: Baseline

41:第一夾角 41: First angle

5:虛擬斜平面 5: Virtual inclined plane

Claims

一種搖頭工具，包括：一身部；一驅動頭，可轉動地連接該身部；及一定位機構，包含有一定位件及一控制件，該定位件可沿一第一方向移動地設於該身部，該控制件可沿橫向該第一方向移動於一鎖定位置及一釋放位置地設於該身部，該控制件與該定位件相互抵靠而成連動關係，該控制件於與該定位件相抵靠之一側設有一容凹槽及複數頂凸部，該容凹槽與該複數頂凸部係沿該控制件之移動方向排列，且該複數頂凸部係朝向遠離該容凹槽之方向呈階狀遞升；其中，當該控制件位於該釋放位置時，該定位件可伸入該容凹槽以遠離釋放該驅動頭，該驅動頭可自由轉動，當該控制件從該釋放位置移動至該鎖定位置時，該定位件脫離該容凹槽且受該複數頂凸部之推抵而朝向該驅動頭靠近，以定位住該驅動頭使其無法轉動。 A waving tool comprises: a body; a driving head rotatably connected to the body; and a positioning mechanism, comprising a positioning member and a control member, the positioning member being movable along a first direction and arranged on the body, the control member being movable transversely to the first direction and arranged on the body to a locking position and a releasing position, the control member and the positioning member being mutually abutted to form a linkage relationship, the control member being provided with a receiving groove and a plurality of top protrusions on one side abutting against the positioning member, the receiving groove and the multiple top protrusions being interlocked with each other, The plurality of convex parts are arranged along the moving direction of the control member, and the plurality of convex parts are stepped upward in the direction away from the receiving groove; wherein, when the control member is located at the release position, the positioning member can extend into the receiving groove to release the driving head away, and the driving head can rotate freely; when the control member moves from the release position to the locking position, the positioning member is separated from the receiving groove and is pushed by the plurality of convex parts to approach the driving head, so as to position the driving head so that it cannot rotate.

如請求項1所述的搖頭工具，其中該定位機構另包含有複數定位槽，該複數定位槽環間隔環繞於該驅動頭，該定位件包含有一柱體及二凸肋，該二凸肋分別凸設於該柱體之相對二端，且該二凸肋之延伸方向係相互垂直，一該凸肋嵌入一該定位槽以定位住該驅動頭，另一該凸肋抵靠於該控制件。 As described in claim 1, the positioning mechanism further comprises a plurality of positioning grooves, the plurality of positioning grooves are arranged around the driving head at intervals, the positioning member comprises a column and two ribs, the two ribs are respectively provided at two opposite ends of the column, and the extension directions of the two ribs are perpendicular to each other, one rib is embedded in one positioning groove to position the driving head, and the other rib abuts against the control member.

如請求項2所述的搖頭工具，其中該二凸肋之結構形狀相同。 A shaking tool as described in claim 2, wherein the two ribs have the same structural shape.

如請求項3所述的搖頭工具，其中該柱體呈圓柱狀，各該凸肋呈等腰直角三角柱狀。 As described in claim 3, the oscillating tool, wherein the column is cylindrical, and each of the ribs is in the shape of an isosceles right-angled triangular prism.

如請求項1所述的搖頭工具，其中該控制件為銷件，各該頂凸部呈齒狀，該複數頂凸部為沿一虛擬斜平面延伸之齒條結構，該虛擬斜平面與該控制件之軸向夾設有一第一夾角，該第一夾角小於45度。 As described in claim 1, the control member is a pin, each of the top protrusions is tooth-shaped, and the plurality of top protrusions are tooth structures extending along a virtual inclined plane. The virtual inclined plane and the control member are axially clamped at a first angle, and the first angle is less than 45 degrees.

如請求項5所述的搖頭工具，其中該複數頂凸部界定出複數齒槽，各該齒槽於該虛擬斜平面之延伸方向上的相對二側分別設有一第一槽壁及一第二槽壁，該第一槽壁較該第二槽壁靠近該容凹槽，該第一槽壁與該第二槽壁共同界定出該齒槽且夾設一鈍角。 As described in claim 5, the plurality of top protrusions define a plurality of tooth grooves, each of the tooth grooves is provided with a first groove wall and a second groove wall on two opposite sides in the extension direction of the virtual inclined plane, the first groove wall is closer to the receiving groove than the second groove wall, the first groove wall and the second groove wall jointly define the tooth groove and sandwich a blunt angle.

如請求項6所述的搖頭工具，其中該第一槽壁沿翹離該控制件之軸向的方向延伸，該第一槽壁與該控制件之軸向夾設有一第二夾角，該第二夾角小於15度。 A shaky head tool as described in claim 6, wherein the first groove wall extends in a direction away from the axial direction of the control member, and the first groove wall and the axial direction of the control member are provided with a second angle, and the second angle is less than 15 degrees.

如請求項5所述的搖頭工具，其中該控制件另包含有一開放式之凹室，該凹室係沿該控制件之徑向凹陷，該容凹槽係凹設於該凹室之底壁，該複數頂凸部係凸設於該凹室之底壁；其中，該複數頂凸部於該控制件之徑向上未凸出該控制件之外輪廓。 As described in claim 5, the control part further comprises an open recessed chamber, the recessed chamber is recessed along the radial direction of the control part, the receiving groove is recessed in the bottom wall of the recessed chamber, and the plurality of convex portions are convexly disposed on the bottom wall of the recessed chamber; wherein the plurality of convex portions do not protrude from the outer contour of the control part in the radial direction of the control part.

如請求項1至8其中任一項所述的搖頭工具，其中該容凹槽係凹設於一基準面，該複數頂凸部係凸設於該基準面，該容凹槽至該基準面最遠的垂直距離與該複數頂凸部至該基準面最遠的垂直距離的比值介於0.4至0.6之間。 A shackle tool as described in any one of claims 1 to 8, wherein the receiving groove is concavely disposed on a reference surface, the plurality of convex portions are convexly disposed on the reference surface, and the ratio of the farthest vertical distance from the receiving groove to the reference surface to the farthest vertical distance from the plurality of convex portions to the reference surface is between 0.4 and 0.6.

如請求項7所述的搖頭工具，其中該定位機構另包含有複數定位槽，該複數定位槽環間隔環凹於該驅動頭，該定位件包含有一柱體及二凸肋，該二凸肋分別凸設於該柱體之相對二端，且該二凸肋之延伸方向係相互垂直，一該凸肋嵌入一該定位槽以定位住該驅動頭，另一該凸肋抵靠於該控制件；該二凸肋之結構形狀相同；該柱體呈圓柱狀，各該凸肋呈等腰直角三角柱狀；該控制件另包含有一開放式之凹室，該凹室係沿該控制件之徑向凹陷，該容凹槽係凹設於該凹室之底壁，該複數頂凸部係凸設於該凹室之底壁；其中，該複數頂凸部於該控制件之徑向上未凸出該控制件之外輪廓；該容凹槽係凹設於一基準面，該複數頂凸部係凸設於該基準面，該容凹槽至該基準面最遠的垂直距離與該複數頂凸部至該基準面最遠的垂直距離的比值介於0.4至0.6之間；該基準面即為該凹室之底壁；各該齒槽之形狀相同；該柱體與各該凸肋係一體成型，各該凸肋遠離該柱體的一端有進行倒角；該定位機構另包含有一彈性件，該彈性件彈抵於該身部與該控制件之間，該彈性件驅使該控制件常態地具有朝向該鎖定位置移動之趨勢。As described in claim 7, the positioning mechanism further comprises a plurality of positioning grooves, the plurality of positioning grooves are recessed in the driving head with annular intervals, the positioning member comprises a column and two ribs, the two ribs are respectively convexly arranged at two opposite ends of the column, and the extension directions of the two ribs are perpendicular to each other, one rib is embedded in one positioning groove to position the driving head, and the other rib is against the control member; the two ribs have the same structural shape; the column is cylindrical, and each rib is in the shape of an isosceles right triangle; the control member further comprises an open recessed chamber, the recessed chamber is recessed along the radial direction of the control member, the receiving groove is recessed in the bottom wall of the recessed chamber, and the plurality of top protrusions are convexly arranged on the bottom of the recessed chamber. wall; wherein the plurality of convex portions do not protrude from the outer contour of the control member in the radial direction of the control member; the receiving groove is concavely arranged on a reference plane, the plurality of convex portions are convexly arranged on the reference plane, and the ratio of the farthest vertical distance from the receiving groove to the reference plane to the farthest vertical distance from the plurality of convex portions to the reference plane is between 0.4 and 0.6; the reference plane is the bottom wall of the recessed chamber; the shapes of the tooth grooves are the same; the column and the ribs are integrally formed, and the end of each rib away from the column is chamfered; the positioning mechanism further includes an elastic member, which is elastically pressed between the body and the control member, and the elastic member drives the control member to normally have a tendency to move toward the locking position.