JP5388290B2 - Fastening member - Google Patents

Description

  The present invention relates to a fastening member that can fasten a first member and a second member that are located apart from each other while maintaining a distance between the two members.

  For example, in an assembly process of an automobile or the like, a fastening member is used that fastens the first member and the second member that are located apart from each other while maintaining the distance therebetween. As shown in Patent Document 1, an example of this type of fastening member is a nut fixed to the first member in a non-rotatable manner, and a hollow collar bolt (movable collar) screwed to the nut with a reverse screw. ) And a fastening bolt inserted into the inside of the color bolt from the second member side.

  Torque transmission means such as special threads are formed between the fastening bolt and the inner peripheral surface of the collar bolt. When the fastening bolt is rotated in the tightening direction (right direction), torque is transmitted by the torque transmission means. The collar bolt thus rotated also rotates. However, since the collar bolt is screwed to the nut with a reverse screw, the collar bolt moves so as to protrude from the nut toward the second member. When the flange at the end of the color bolt comes into contact with the second member, further movement is impossible. In this state, when the fastening bolt is further rotated in the tightening direction, the connection with the collar bolt by the torque transmitting means is released, the fastening bolt is detached from the collar bolt, and advances alone to the first member side. Since it is provided on the one-member side, it can be screwed together with the screw member, and the first member and the second member can be fastened while maintaining the distance therebetween.

  A similar fastening member is also disclosed in Patent Document 2. 8 to 11 of Patent Document 2 disclose that a nut is attached to the first member side with a resin clip having a plurality of clip legs. If such a resin clip is used, the nut can be attached to the first member side at a lower cost than by welding.

  Since the fastening member as described above is used by advancing the color bolt according to the interval between the first member and the second member, the collar bolt is completely accommodated in the nut in the initial state. It is desirable to be in a state farthest from the second member. However, the color bolt generally has a large-diameter flange at the end on the second member side in order to ensure a contact area with the second member. For this reason, if another member contacts or collides with the flange before the fastening member is assembled to the vehicle body or the like, the collar bolt may rotate and loosen from the initial position and protrude from the nut. When such looseness occurs, it causes a mounting failure.

Japanese Patent No. 3764420 JP-A-2005-61613

  Therefore, the object of the present invention is to solve the above-mentioned conventional problems, and the color bolt does not rotate due to contact with other members or the like before being assembled and loosen from the initial position, and there is a risk that a mounting failure may occur. It is providing the fastening member which does not have.

The present invention made to solve the above problems is a fastening member for fastening the first member and the second member while maintaining the distance between the two members,
A clip body fixed to the first member by a plurality of clip legs;
A nut that is non-rotatably held in the center of the clip body;
A hollow collar bolt that is screwed into the inside of the nut via a reverse screw and has a flange at the end on the second member side,
It consists of a fastening bolt that has a male thread portion that extends through the second member and contacts the inner surface of the collar bolt via a torque transmission means,
The collar bolt is rotated by a fastening bolt through a torque transmission means, and is moved by the reverse screw to a position where the flange comes into contact with the second member,
A projecting piece for protecting the outer periphery of the flange of the color bolt is formed on the end surface portion of the clip body ,
A contact claw bent inward is formed on a part of the protruding piece, and is elastically brought into contact with the outer peripheral surface of the non-circular flange .

Note as in claim 2, it is preferable that the structure in which the circular plate spring as a torque transmission means to the inner surface of the collar Boruto. Further as in claim 3, the inner peripheral surface of the collar bolt flange, it is preferable that a structure forming a tool-engaging portion.

In the fastening member of the present invention, since the projecting piece for protecting the outer periphery of the flange of the color bolt is formed on the end surface portion of the clip body, other members may come into contact with or collide with the flange before assembling to the vehicle body or the like. This prevents the color bolt from rotating and loosening from the initial position. For this reason, the mounting defect resulting from the looseness of the color bolt does not occur. In addition, since a contact claw bent inward is formed on a part of the projecting piece and is elastically brought into contact with the outer peripheral surface of the non-circular flange , the color bolt does not easily rotate and is difficult to loosen. Needless to say, since a large rotational torque is applied by the tool during the fastening operation, the collar bolt rotates and exhibits its intended function.

It is an external appearance perspective view which shows embodiment of this invention. It is a top view which shows embodiment of this invention. It is a center longitudinal cross-sectional view which shows embodiment of this invention. It is the top view and expansion | deployment figure of a leaf | plate spring. It is sectional drawing of a clip main body. It is a front view which shows the state which the color volt | bolt protruded. It is sectional drawing which shows a fastening state.

Hereinafter, preferred embodiments of the present invention will be described.
As shown in FIGS. 1 to 3, the fastening member of the present invention is screwed into the clip body 1, a nut 2 that is non-rotatably held at the center of the clip body 1, and the nut 2. And a hollow color bolt 3. In addition, a fastening bolt 4 is necessary, but since a normal bolt may be used, it is shown only in FIG. 7 and omitted in other drawings.

  The clip main body 1 is a resin molded product having a plurality of clip legs 5 as shown in FIGS. 3 and 5. In this embodiment, the clip body 1 includes two clip legs 5, and these clip legs 5 are inserted into the two holes 7 formed through the first member 6 and elastically deformed outward. It is fixed to the first member 6. The clip main body 1 has a hexagonal cylindrical shape, and holds the nut 2 in a non-rotatable manner therein. In addition, vertical protrusions 8 for preventing the nut 2 from falling off are formed on the inner surface of the clip body 1 at predetermined intervals.

  The shape of the nut 2 is a normal hex nut, but the screw on the inner surface is a reverse screw 9 (left screw). The nut 2 is non-rotatably fixed to the first member 6 by the hexagonal cylindrical clip body 1.

  The collar bolt 3 is screwed into the nut 2, and a reverse screw 10 corresponding to the reverse screw 9 of the nut 2 is formed on the outer peripheral surface of the cylindrical portion. A large-diameter flange 12 is formed at the end of the color bolt 3 on the second member 11 side. This flange 12 is for ensuring a large contact area when the collar bolt 3 abuts against the second member 11. In the initial state, the collar bolt 3 is in a position where the back surface of the flange 12 contacts the upper end surface of the nut 2, and protrudes toward the second member 11 during fastening.

  On the inner peripheral surface of the color bolt 3, torque transmission means for transmitting the rotational torque from the fastening bolt 4 to the color bolt 3 is provided. In this embodiment, the torque transmission means is a circular leaf spring 13 as shown in FIG. The whole has a shape in which a part of a circle is notched in a plan view, and is elastically fitted in a spring accommodating portion 14 formed on the inner peripheral surface of the collar bolt 3. A plurality of elastic claws 15 are cut and raised inside the leaf spring 13, and a plurality of locking claws 16 protrude from the outside of the leaf spring 13. These locking claws 16 are for ensuring the engagement with the inner peripheral surface of the collar bolt 3. A small protrusion 17 is provided at the lower part of the inner peripheral surface of the collar bolt 3 to prevent the leaf spring 13 from falling off.

  When the fastening bolt 4 penetrating the second member 11 is inserted into the collar bolt 3 and rotated in the fastening direction, the plurality of elastic claws 15 come into close contact with the outer periphery of the threaded portion of the fastening bolt 4, and the fastening bolt Rotational torque from 4 is transmitted to the color bolt 3. As a result, the collar bolt 3 rotates in the right direction, but since the reverse screws 9 and 10 are formed between the collar bolt 3 and the nut 2, the collar bolt 3 rotates upward as shown in FIG. It protrudes and contacts the second member 11. When this state is reached, the collar bolt 3 can no longer rotate. Therefore, when the fastening bolt 4 is further rotated, slippage occurs in the torque transmission means, and only the fastening bolt 4 faces the first member 6. And move forward. As shown in FIG. 7, a fastening nut 18 is welded to the first member 6 in advance, and the fastening bolt 4 is screwed into the fastening nut 18 to be in a final fastening state. The fastening nut 18 can be variously modified. For example, a female screw can be cut directly on the first member 6.

  The fastening method described above is basically the same as that of the conventional fastening member, but the configuration unique to the present invention will be described below.

  In the present invention, the large-diameter flange 12 of the collar bolt 3 is non-circular as shown in FIG. In this embodiment, it is an octagon. A projecting piece 19 for protecting the outer periphery of the flange 12 of the collar bolt 3 is provided on the end face portion of the clip body 1. The projecting piece 19 is formed by projecting the end surface of the clip body 1 outward and upward, and is a hexagon in this embodiment. The diameter of the hexagonal circumscribed circle is substantially the same as the diameter of the octagonal inscribed circle. Therefore, the projecting piece 19 prevents other members from coming into contact with the side surface of the large-diameter flange 12 of the collar bolt 3 but allows the large-diameter flange 12 of the collar bolt 3 to rotate.

As described above, since the projecting piece 19 does not have a function of directly preventing the rotation of the color bolt 3, there is a possibility that the color bolt 3 rotates due to vibration during transportation. Therefore, in the present invention, a contact claw 20 bent inward is formed on a part of the projecting piece 19 and is elastically brought into contact with the outer peripheral surface of the non-circular flange 12 of the collar bolt 3. This prevents the rotation of the color bolt 3 due to vibration during transportation. However, the contact claw 20 does not hinder the rotation of the color bolt 3 at the time of fastening.

  A tool engaging portion 21 is formed on the inner peripheral surface of the flange 12 of the collar bolt 3. If a tip such as a hexagon wrench is inserted into the non-circular tool engaging portion 21 and rotated, the collar bolt 3 can be easily screwed to the initial position shown in FIG. 3 before fastening.

  As described above, the fastening member of the present invention has the protruding piece 19 that protects the outer periphery of the flange 12 of the color bolt 3 on the end surface portion of the clip body 1, so that the color bolt 3 and the other members are assembled before assembly. The fastening operation can be started in a state where the color bolt 3 is in the initial position without rotating by the contact or the like and being loosened from the initial position.

DESCRIPTION OF SYMBOLS 1 Clip main body 2 Nut 3 Color bolt 4 Fastening bolt 5 Clip leg part 6 1st member 7 Hole 8 Projection 9 Reverse screw 10 Reverse screw 11 2nd member 12 Flange 13 Leaf spring 14 Spring accommodating part 15 Elastic nail 16 Locking Claw 17 Small protrusion 18 Fastening nut 19 Projection piece 20 Contact claw 21 Tool engaging portion

Claims (3)

A fastening member for fastening the first member and the second member while maintaining a distance between the two members,
A clip body fixed to the first member by a plurality of clip legs;
A nut that is non-rotatably held in the center of the clip body;
A hollow collar bolt that is screwed into the inside of the nut via a reverse screw and has a flange at the end on the second member side,
It consists of a fastening bolt that has a male thread portion that extends through the second member and contacts the inner surface of the collar bolt via a torque transmission means,
The collar bolt is rotated by a fastening bolt through a torque transmission means, and is moved by the reverse screw to a position where the flange comes into contact with the second member,
A projecting piece for protecting the outer periphery of the flange of the color bolt is formed on the end surface portion of the clip body ,
A fastening member characterized in that a contact claw bent inward is formed on a part of the projecting piece and is elastically brought into contact with an outer peripheral surface of a non-circular flange .   The fastening member according to claim 1, wherein a circular leaf spring is disposed on the inner surface of the color bolt as torque transmitting means.   The fastening member according to claim 1, wherein a tool engaging portion is formed on an inner peripheral surface of the flange of the color bolt.

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