CN111373162B - 易于移除的推入式弹簧螺母 - Google Patents

易于移除的推入式弹簧螺母 Download PDF

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CN111373162B
CN111373162B CN201880075065.9A CN201880075065A CN111373162B CN 111373162 B CN111373162 B CN 111373162B CN 201880075065 A CN201880075065 A CN 201880075065A CN 111373162 B CN111373162 B CN 111373162B
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fastener
resilient
assembly
pin
arms
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CN111373162A (zh
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麦可·马隆尼
强纳森·伯朗克
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Penn Engineering and Manufacturing Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/06—Releasable fastening devices with snap-action
    • F16B21/07—Releasable fastening devices with snap-action in which the socket has a resilient part
    • F16B21/073—Releasable fastening devices with snap-action in which the socket has a resilient part the socket having a resilient part on its inside
    • F16B21/075—Releasable fastening devices with snap-action in which the socket has a resilient part the socket having a resilient part on its inside the socket having resilient parts on its inside and outside
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/06—Releasable fastening devices with snap-action
    • F16B21/07—Releasable fastening devices with snap-action in which the socket has a resilient part
    • F16B21/076—Releasable fastening devices with snap-action in which the socket has a resilient part the socket having a resilient part on its outside
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2/00—Friction-grip releasable fastenings
    • F16B2/20—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening
    • F16B2/22—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material
    • F16B2/24—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal
    • F16B2/241—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal
    • F16B2/245—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal external, i.e. with contracting action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/06—Releasable fastening devices with snap-action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/06—Releasable fastening devices with snap-action
    • F16B21/07—Releasable fastening devices with snap-action in which the socket has a resilient part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/10—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
    • F16B21/20—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts for bolts or shafts without holes, grooves, or notches for locking members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/02—Nuts or like thread-engaging members made of thin sheet material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/06—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips
    • F16B5/0607—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other
    • F16B5/0621—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other in parallel relationship
    • F16B5/0642—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other in parallel relationship the plates being arranged one on top of the other and in full close contact with each other

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
  • Insertion Pins And Rivets (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

一种紧固件，其通过将轴向压力施加到诸如圆销或方形突片之类的配合部件上进行安装。该紧固件包括由弯曲的突片形成的弹簧臂，该弯曲的突片在被压到销或位于臂的卡爪之间的其它配合部件上并抓持它们时会弯曲，从而使得紧固件难以被拉出。当它们与配合部件的另一部分接触时，围绕紧固件周缘定位的面朝下的指状件挠曲。这就在紧固件和部件之间产生了剩余的夹紧载荷。可以利用类似于卡环钳或尖嘴钳的工具轻松移除该紧固件。位于紧固件相对侧上的两个孔允许零件被挤压并变形为椭圆形。该动作使臂脱离接合，并允许紧固件在没有阻力的情况下滑动离开配合部件。

Description

易于移除的推入式弹簧螺母
相关申请
这是基于2017年11月22日提交的、题为“具有移除工具的推入式弹簧螺母”的临时申请第62/589,874号的非临时专利申请，据此要求其优先权。
技术领域
本发明涉及接纳并夹持轴的紧固件，其通过简单的轴向插到轴上而施加。更具体地，本发明涉及能施加剩余夹紧载荷的极小或微小尺寸的弹簧螺母。
背景技术
当前的微型紧固件或焊接技术在所有情况下都不能为紧固需求提供良好的解决方案。通常期望大多数紧固系统的三个主要功能方面：夹紧载荷、易于安装和可移除性。当前，没有满足所有这三个需求的微型紧固件。许多应用需要或将受益于在两个配合部件之间产生的夹紧载荷。此外，在组装操作中，采用简单的安装运动是有用的，最简单的是施加到紧固件的轴向载荷。这节省了安装工具作业的时间和成本。与使用依靠扭矩和驱动系统来转动紧固件的螺纹紧固件相比，施加轴向载荷更为简单。诸如铆接和点焊之类的面板附连方法形成了永久连接，但不允许轻易更换或维修零件。
因此，在紧固领域中，需要一种易于安装和移除、并向组装后的物体提供剩余夹紧载荷的紧固件。进一步需要具有这些特征的微小尺寸的紧固件。
发明内容
为了满足上述紧固技术的需要，已经设计出一种紧固件，该紧固件可以通过将轴向压力施加到圆销、方形突片或其它配合部件上进行安装。该紧固件包括由弯曲的突片形成的弹簧臂，该弯曲的突片在被压到销或在臂的卡爪之间的其它配合部件上并抓持它们时会弯曲，从而使得它们难以被拉出。当它们与配合部件的另一部分接触时，围绕紧固件周缘定位的面朝下的指状件挠曲。这就在紧固件和部件之间产生了剩余的夹紧载荷。可以使用类似于卡环钳或尖嘴钳的工具轻松移除该紧固件。紧固件相对侧上的两个孔允许零件被挤压并变形为椭圆形。该动作使臂与销或配合部件脱离接合，并允许紧固件在没有阻力的情况下滑动离开。
更具体地，本发明的紧固件包括由弹性材料构成的整体式本体，所述本体具有带有圆形周缘的平的顶部。穿过顶部中心的大致矩形的开口具有成对的相对的短侧和长侧，它们的中心线分别限定了紧固件的副轴和主轴。一对相对的弹性臂从平的顶部向上且向内延伸。每个臂沿着主轴附着在开口的短侧之一上。多个向外且向下延伸的弹性指状件位于顶部的周缘上。顶部具有两个通孔，每个通孔位于开口的相对侧上，沿着副轴邻近其较长侧。这些孔适于接受相反的向内指向的力的施加，以使紧固件变形，从而使臂分散开。每个臂在其远端处具有弧形卡爪，并且每个指状件沿径向渐缩。整个紧固件较佳地是由弹簧钢或不锈钢构成的整体式元件，其中整个紧固件的厚度相同。
上述本发明的紧固件可以用于各种组件中，但是特别地，它可以有效地与诸如销之类的具有头部和从头部延伸的细长杆的第二构件一起使用。紧固件围绕杆定位，使得臂与杆接合，从而将剩余的夹紧载荷施加到头部。紧固件的指状件较佳地等距地间隔开。为了易于将紧固件从销上拆下和移除，顶部具有两个通孔，每个通孔位于穿过顶部的矩形开口的相对侧上，沿着副轴邻近其较长侧。孔的内侧适于接纳相反的向内指向的力的施加，由此使紧固件变形，使得臂分散开，从而可以从销上提升紧固件。紧固件可以是由弹簧钢或不锈钢构成的一件式元件。
与使用螺母和螺栓的螺纹接头相比，利用单个轴向力将紧固件压入适当位置的能力使组装得以简化。与其它非螺纹组装方法相反，该紧固件具有在面板之间提供夹紧载荷的优点。与典型的附连方法相比，轻松移除紧固件的能力是另一个益处。
因此，本发明的目的是设计一种紧固件元件，该紧固件元件将接合第二紧固件元件的杆并且在施加之后产生剩余的夹紧载荷。本发明的另一个目的是提供一种易于通过简单的轴向压紧组装的紧固件元件。这在微型装配中特别需要。本发明的又一个目的是提供移除紧固件的能力，同时还改进了诸如铆接和焊接的已知紧固技术。
通过以下附图和较佳实施例的描述，本发明的这些和其它目的以及优点对于本领域技术人员将是显而易见的。
附图说明
图1是本发明的一个实施例的左上前等轴测视图。
图2是其前视剖视图。
图3是其俯视图。
图4是描绘安装在销上的本发明的前视剖视图。
图5A和5B是示出了本发明松弛之前和之后的俯视图，并且然后由移除工具致动。
图6和7是在图5A和5B所示的安装顺序中使用的工具的右上前等轴测视图。
具体实施方式
现在参考图1，本发明被实施为大致圆形的弹簧螺母紧固件10。该紧固件具有相对平的顶部14和矩形中心开口12，该中心开口12具有成对的相对的长侧和短侧，它们的中心线限定紧固件的主轴和副轴，如分别明确地描绘在图3中的。紧固件的中心由主轴和副轴的交点限定。成对的一体化相对的弹性突片形成弹簧臂11，该弹簧臂11从开口12的两个较短侧的每一个沿着主轴向上延伸。如在此和在图3中所见的，每个突片可包括弧形的顶端。多个弹性指状件13从顶表面14的周缘向外且向下延伸。指状件13是锥形的，但也能够尖锐地指向或以最适合其特定应用的任何特定方式构造。两个竖直孔15穿过顶表面14，并且在副轴上位于中心开口12的较长侧附近。这些孔适于接纳工具的尖齿，该尖齿在施加到顶表面14上的挤压力的作用下通过紧固件的变形使相对的臂11移动分开得更远。
图2示出了正视图的横截面，其示出了面朝上的突片11的构造，该突片防止紧固件从诸如图4所示的销之类的配合部件掉落或被推出。臂11被设计成使得它们将由配合部件强制打开而不会在安装期间屈曲。这就产生了作用在诸如图4所示的销之类的配合部件上的弹簧附连力。由于臂11以更大的抓持力反作用抵抗由于抵抗配合部件的向内楔入作用而产生的拉出力，因而臂11的弯曲所得的角度使得其对配合部件的保持力难以克服。该作用增加了臂抵靠部件的力和静摩擦。
现在参考图3，本发明的另一个主要特征是紧固件的顶表面中的通孔15。孔15提供了能插入工具以施加向内挤压力的位置。线A-A和B-B分别代表紧固件的主轴和副轴。挤压力沿着副轴B-B朝向所捕获的销17作用，并使整个紧固件的形状变形。如以下在图5A和5B中更详细地解释的，由此迫使紧固件从其圆形自由状态成为椭圆形状。这种变形迫使臂11从销17周围打开，从而允许紧固件与销脱离并向上移除。
在图4中，我们看到了紧固件的视图，该紧固件安装在具有头部19和杆16的销17上。在此，面朝下的弹性指状件13的挠曲在销头19和销杆16之间产生夹紧载荷。当首先将紧固件压靠头部19时，指状件13被压缩。指状件13被构造成使得它们弯曲而不屈曲，因而这就在紧固件中留下了所得的力，从而产生了作用抵抗销头19的向下的力。臂11形成与销杆17接合的夹持卡爪18。卡爪18之间的自由空间被适当地选择成小于销的直径或被接合的部件的宽度。卡爪18可具有弧形轮廓以匹配销杆的直径，以增加用于更多的抓持力的接触面积。由于通过以锐角抓持销杆16的面朝上的臂11防止了紧固件在相反的方向上向上移动，因此保持了夹紧载荷。
在图4中看到的本发明的这种结构可以起到类似于螺母和螺栓的作用，它们可以用于将元件在紧固件的头部和指状件之间夹紧在一起。例如，可以将面板捕获在紧固件和销头19之间，并且可以添加其它面板或材料，并且将它们面对面地夹紧在一起。此处所示的销杆16光滑且没有特征，但可以包括其它特征，比如圆形脊以增加杆的静摩擦特性。而且，销杆16可以进一步向上延伸超过第一紧固件，以根据可能的情况接合其它类似的紧固件或其它结构。从该附图和其它附图中，对于本领域技术人员将显而易见的是，存在可以采用本发明的紧固件的许多可能的用途和修改。
图5A和5B描绘了紧固件如上所述被挤压时之前和之后的状态。为了清楚起见，在此仅示出了移除工具的末端21。随着紧固件被挤压，孔移动更靠近在一起，这使紧固件如上所述变形，并迫使臂11分开更远。紧固件的这些状态分别对应于在图6和7中所见的工具23的施加顺序。紧固件的这种变形使突片远离捕获的销17移动，从而释放保持力。一旦臂11不再与销接触，紧固件就可以在没有阻力的情况下自由地滑动离开销。
图6和7描绘了一种利用两个突出销21的工具，该两个突出销21附连到工具手柄(未示出)的可移除尖齿23。销装配到紧固件10的通孔中，以随着将尖齿迫到一起将挤压力传递到孔的内侧，如图7中的箭头所示。结果是紧固件从被捕获的部件释放，如上文关于图5A和5B所述的。挤压力还通过工具在紧固件上施加抓持力，因此工具可以从销上提升紧固件。为了易于插入通孔中，该工具可以具有尖的末端以帮助与接纳孔对准。
有助于紧固件的整体功能的至少三个主要特征是：
1.面朝上的臂11，其可以挠曲并抓持到插入中心开口中的圆销或矩形突片上。
2.面朝下的指状件13，其在已经安装紧固件后提供夹紧载荷。
3.紧固件中的竖直孔，其允许施加挤压力。此动作使安装在销上的突片脱离接合，以易于移除。
适用于上述推入式螺母的构成的材料是具有高拉伸强度和高屈服拉伸强度比的主要特性的材料。示例包括301全硬不锈钢和1095弹簧钢。本发明的螺母特别适用于微型组件，其中，例如，螺母所具有的直径约为3mm，厚度为0.13mm。
根据前述内容，对于本领域技术人员而言显而易见的是，已经实现了本发明的目的。还应当理解，在不脱离本发明的范围的情况下，可能存在许多可能的变型和改型，本发明的范围仅应由权利要求及其合法等同物来限制。

Claims (15)

1.一种整体式紧固件，包括：
由弹性材料构成的整体式本体，所述本体具有带有圆形周缘的平的顶部；
穿过所述顶部中心的矩形的开口，所述开口具有成对的相对的短侧和长侧，它们的中心线分别限定了所述紧固件的副轴和主轴，
从所述顶部向上且向内延伸的成对相对的弹性臂，每个弹性臂沿所述主轴附着到所述开口的所述短侧之一；以及
向外且向下延伸的多个弹性指状件，所述弹性指状件位于所述顶部的周缘上；以及
其特征在于，所述顶部具有两个通孔，每个通孔位于所述开口的相对侧上，沿着所述副轴邻近其较长侧，所述通孔具有向内的侧部，适于接受向内指向的力的施加，由此所述紧固件变形，使得所述弹性臂分散开。
2.如权利要求1所述的紧固件，其特征在于，每个弹性臂在其远端处具有弧形的卡爪。
3.如权利要求2所述的紧固件，其特征在于，每个弹性指状件沿径向渐缩。
4.如权利要求3所述的紧固件，其特征在于，整个紧固件是由弹簧钢构成的整体式元件。
5.如权利要求3所述的紧固件，其特征在于，整个紧固件是由不锈钢构成的整体式元件。
6.如权利要求4或5所述的紧固件，其特征在于，整个所述紧固件的厚度相同。
7.如权利要求1所述的紧固件，其特征在于，所述弹性指状件围绕所述周缘均匀地间隔开。
8.如权利要求1所述的紧固件，其特征在于，只存在两个弹性臂。
9.一种组件，包括：
第一紧固构件，所述第一紧固构件具有头部和从所述头部延伸的细长杆；以及
如权利要求1所述的紧固件，所述紧固件围绕所述细长杆定位，使得所述弹性臂与所述细长杆接合，并使剩余的夹紧载荷施加到所述头部。
10.如权利要求9所述的组件，其特征在于，每个弹性臂在其远端处具有弧形的卡爪。
11.如权利要求10所述的组件，其特征在于，每个弹性指状件沿径向渐缩。
12.如权利要求11所述的组件，其特征在于，整个紧固件是由不锈钢构成的整体式元件。
13.如权利要求11所述的组件，其特征在于，整个紧固件是由弹簧钢构成的整体式元件。
14.如权利要求12或13所述的组件，其特征在于，整个所述紧固件的厚度相同。
15.如权利要求9所述的组件，其特征在于，所述紧固件的直径为3mm。
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