JP2016180505A - Fastening bolt stopper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a positive prevention of loosening of a bolt on which vibration acts, enable the bolt once stopped against its loosening and fastened to be easily removed and additionally to enable a stopper to be easily assembled to the bolt.SOLUTION: This invention relates to a fastening bolt 2 including a male thread part 22 engaged in thread with a female thread hole 1a of a member 1 to be fastened, one end of a supporting member 3 with a smaller outer diameter than that of the male thread part 22 is connected to an extremity end part 23 of the fastening bolt 2 through connecting means 5, a coil spring 4 having a pitch coinciding with a pitch of the male thread part 22 of the fastening bolt 2 is arranged at an outer periphery of the supporting member 3, one end side of the coil spring 4 is applied as a free end part 4a under non-contacted state, the other end side is applied as a fixing end part 4b held at the other end of the supporting member 3 and the extremity end of the free end part 4a of the coil spring 4 is coincided with a starting point of thread machining operation for the male thread part 22 of the fastening bolt 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bolt locking device that is screwed onto a member to be fastened, and is particularly suitable for locking an implanted bolt.

  As a conventional device for preventing loosening of a bolt, it has been proposed to hold a coil spring, which is a helical elastic body, at the tip of the bolt as in Patent Document 1, and the one in Patent Document 1 has a smaller diameter than the male screw of the bolt. The small-diameter portion of the bolt is integrally provided at the tip of the bolt, a coil spring that is screwed into the female screw hole of the member to be fastened is disposed around the small-diameter portion, and this coil spring is pressed against the inner surface of the groove of the female screw, thereby The rotation is prevented and the bolt is prevented from loosening due to vibration transmitted from the fastened member.

JP 2008-298218 A

  However, in the locking structure as in Patent Document 1, when the bolt is screwed into the female screw hole of the member to be fastened, the coil spring is not arranged at the same pitch as the male screw on the extension of the male screw of the bolt. The bolts cannot be smoothly screwed together, and it is necessary to arrange them so that the pitch of the male screw of the bolt and the pitch of the coil spring do not deviate.

  The present invention has been made in view of the above, and can easily match one end of the coil spring with the starting point of threading of the male threaded portion of the fastening bolt. It is an object of the present invention to provide a fastening bolt loosening prevention device in which the coil springs can be easily arranged at the same interval as the pitch and the front end of the fastening bolt and the coil spring can be easily assembled.

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

  The invention according to claim 1 is a fastening bolt having a male screw portion screwed into a female screw hole of a member to be fastened, and is connected to a front end portion of the fastening bolt via a connecting means. One end of a support member having a diameter smaller than the diameter is connected, a coil spring having a pitch matching the pitch of the male screw portion of the fastening bolt is arranged on the outer periphery of the support member, and one end side of the coil spring is free in a non-contact state The other end side is a fixed end held by the other end of the support member, and the tip of the free end of the coil spring is made to coincide with the starting point of threading of the male screw portion of the fastening bolt. A fastening bolt loosening prevention device characterized in that.

  The invention according to claim 2 is characterized in that the distance between the front end portion of the fastening bolt and the free end portion of the coil spring is the same as the pitch of the male screw portion of the fastening bolt. The fastening bolt loosening prevention device according to claim 1, wherein the distal end portion and the one end of the support member are coupled by the connecting means.

  According to a third aspect of the present invention, the support member is provided with a locking portion with which the free end portion of the coil spring abuts when the fastening bolt is rotated in a direction opposite to the screwing direction. Item 3. The fastening bolt loosening prevention device according to Item 1 or 2.

  With the above configuration, the present invention has the following effects.

  The invention according to claim 1 is a fastening bolt having a male screw portion screwed into a female screw hole of a member to be fastened, and is connected to a front end portion of the fastening bolt via a connecting means. One end of a support member having a diameter smaller than the diameter is connected, a coil spring having a pitch matching the pitch of the male screw portion of the fastening bolt is arranged on the outer periphery of the support member, and one end side of the coil spring is free in a non-contact state The other end side is a fixed end held by the other end of the support member, and the tip of the free end of the coil spring is made to coincide with the starting point of threading of the male screw portion of the fastening bolt. Therefore, the coil spring and the support member are sub-assembled and connected by the connecting means, and the free end portion of the coil spring can be easily matched with the starting point of the threading start of the male screw portion of the bolt. so , The coil spring accuracy is often arranged as an extension of the male screw portion of the bolt, screwing of the bolt of the to-be fastened member can be smoothly.

  In the invention according to claim 2, the distance between the tip of the fastening bolt and the free end of the coil spring is the same as the pitch of the male threaded portion of the fastening bolt. Since the tip and the one end of the support member are connected by the connecting means, the distance between the tip of the bolt and the free end of the coil spring is the same as the pitch of the male screw portion of the bolt. The bolt and the coil spring can be smoothly screwed into the female screw hole.

  According to a third aspect of the present invention, when the fastening bolt is rotated in the direction opposite to the screwing direction, a locking portion that contacts the free end of the coil spring is provided on the support member. The bolt 2 can be easily removed.

Sectional drawing which shows the 1st embodiment in this invention. Sectional drawing by the AA line of FIG. Sectional drawing which shows the rotational operation state with respect to the volt | bolt in this invention. Sectional drawing which shows the 2nd Embodiment of this invention. Sectional drawing by the BB line of FIG.

  Hereinafter, embodiments of the bolt locking device according to the present invention will be described. The embodiment of the present invention shows the most preferable mode of the present invention, and the present invention is not limited to this.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an example in which a bolt locking device is implemented. What is indicated by a symbol A is a fixing member, and the fixing member A is implanted and attached to a member 1 to be fastened.

  The fastening bolt 2 includes a hexagonal head portion 21 and a male screw portion 22 that is screwed into the female screw hole 1a of the member 1 to be fastened, and the male screw portion 22 is formed from a starting point 22a of screw processing. Is done.

  One end 3 a of the support member 3 having a smaller diameter than the outer diameter of the male screw portion 22 is coupled to the tip end portion 23 of the fastening bolt 2 via a connecting means 5. The connecting means 5 connects a cylindrical convex portion 5 a provided at one end 3 a of the support member 3 to a concave portion 5 b provided at the tip portion 23 of the fastening bolt 2 so as to be rotatable.

  A coil spring 4 having a pitch matching the pitch of the male screw portion 22 is disposed on the outer periphery of the support member 3, and one end side of the coil spring 4 is a non-contact free end portion 4a, and the free end portion 4a is The locking portion 3a provided on the support member 3 is aligned with the starting point 22a of the threaded start of the male screw portion 22 of the fastening bolt 2 and rotated in the direction opposite to the screwing direction of the bolt 2. Make contact. The free end 4a may be bent at its tip so that it can easily come into contact with the locking portion 3a of the support member 3.

  The other end side of the coil spring 4 is a fixed end portion 4 b held by the other end 3 b of the support member 3. The fixed end 4b is held by a hole drilled in the support member 3, but a groove may be formed at the tip of the support member 3 to hold it.

  In order to make the free end portion 4a of the coil spring 4 coincide with the starting point 22a of the threading start of the male screw portion 22 of the fastening bolt 2, the coil spring 4 and the support member 3 are subassembled and then the assembly is performed. The projection 5a and the recess 5b of the connecting means 5 are fitted to each other, and the free end 4a of the coil spring 4 is engaged with the start of the threading of the male screw 22 while the support member 3 is rotated. Match 22a. Thereafter, the one end 3 a of the support member 3 and the tip portion 23 of the fastening bolt 2 are welded together by resistance welding or the like, and the support member 3 is fixed to the tip portion 23 of the fastening bolt 2.

  In addition, although the said connection means 5 provided the said recessed part 5b in the said front-end | tip part 23 of the said fastening bolt 2, and provided the said convex part 5a in the said supporting member 3, the said convex part in the said front-end | tip part 23 of the said fastening bolt 2 And the concave portion may be provided in the support member 3.

  When the coil spring 4 is screwed into the female screw hole 1a of the member 1 to be fastened, the fixed end 4b of the coil spring 4 is inserted into the opening side of the female screw hole 1a, and the coil spring 4 is connected to the fastening bolt. 2, the coil spring 4 is screwed into the female screw hole 1 a in the same manner as a normal bolt screwed into the female screw hole 1 a.

  Although rotation resistance is generated by contact friction with the inner surface of the female screw hole 1a with which the coil spring 4 comes into contact, when the coil spring 4 rotates in the screwing direction of the bolt 2, the fixed end portion 4b of the coil spring 4 is used. Since the coil spring 4 is stretched by leading the free end portion 4a, and the coil spring 4 is an elastic body, as shown in FIG. The diameter of the coil spring 4 is slightly reduced, the coil spring 4 is bent inward, the rotational resistance due to contact friction is reduced, and it can be screwed relatively easily.

  When the fastening bolt 2 is continuously rotated in the screwing direction when the coil spring 4 is screwed into the female screw hole 1a, the distal end portion 23 of the fastening bolt 2 follows the coil spring 4 and the female screw hole 1a. Screw in. At this time, not only the coil spring 4 is formed with substantially the same pitch of the male screw portion 22 of the fastening bolt 2, but also the tip 23 of the fastening bolt 2 and the free end 4 a of the coil spring 4. When the interval is set to the same interval as the pitch of the male screw portion 22 of the fastening bolt 2, the male screw portion 22 and the coil spring 4 form a continuous spiral, and the coil spring 4 and the coil spring 4 into the female screw hole 1a The bolt 2 can be screwed smoothly.

  By screwing the fastening bolt 2 together with the coil spring 4 into the female screw hole 1a to a predetermined depth, the fixing member A is sandwiched between the head 21 of the fastening bolt 2 and the fastened member 1. In the tightened and fixed state, the coil spring 4 expands in diameter and comes into pressure contact with the inner surface of the female screw hole 1a, and the coil spring 4 is prevented from rotating with respect to the female screw hole 1a. Thus, the fastening bolt 2 is also prevented from rotating, thereby preventing the fastening bolt 2 from loosening.

  Further, when the fastening bolt 2 is turned in the direction opposite to the screwing direction in a state where the turning of the fastening bolt 2 is prevented by the coil spring 4, the coil spring 4 is pressed against the inner surface of the female screw hole 1a. Therefore, although the fastening bolt 2 cannot be easily turned manually, when the fastening bolt 2 is turned strongly with a tool or the like, the free end 4a of the coil spring 4 is gradually turned to When the bolt 2 is rotated by a predetermined angle, the free end 4 a of the coil spring 4 comes into contact with the locking portion 3 c of the support member 3.

  In this state, when the fastening bolt 2 is continuously rotated in the same direction, the free end portion 4a of the coil spring 4 is rotated in the same direction via the locking portion 3c of the support member 3, and the coil spring 4 is rotated. 3 is gradually tightened, the diameter is reduced as shown in FIG. 3, the contact friction with the female screw hole 1 a is reduced, and the fastening bolt 2 is moved together with the coil spring 4 in the direction opposite to the screwing direction. It can be rotated and removed.

  Next, a second embodiment will be described with reference to FIGS. In this embodiment, the same components as those in the first embodiment will be described with the same reference numerals.

  In the second embodiment, the concave-convex fitting is the same as that of the connecting means 5 described in the first embodiment, but in addition to the concave-convex fitting, the serration 7 is formed. The one end 3a of the support member 3 is fixed to the distal end portion 23 of the male screw portion 22 so as not to rotate.

  In this second embodiment, the match between the starting point 22a of the threading start of the male screw portion 22 of the fastening bolt 2 and the free end portion 4a of the coil spring 4 is the same as that of the male screw of the fastening bolt 2. The position of the serration 6 where the starting point 22a of the processing start of the portion 22 coincides with the free end 4a is determined in advance, the concave portion 5a and the convex portion 5b are fitted by press-fitting, and the support member 4 is The bolt 2 is fixed to the tip portion 23. When the concave / convex fitting is performed through the serration 6, there is a slight deviation in the match between the starting point 22 a of the screw threading start of the male screw portion 22 of the fastening bolt 2 and the free end portion 4 a of the coil spring 4. Even if it is allowed, there is no problem. In addition, you may make it not the uneven | corrugated fitting via the said serration 6 but the fitting by a spline.

  In the fastening bolt retaining device having the above-described configuration, the coil spring 4 that is in frictional contact with the groove of the female screw 1a can be sub-assembled to the support member 3 and then coupled by the connecting means 5. It is easy to match the free end portion 4a with the starting point 22a of the screw processing start of the male screw portion 22, and the male screw portion 22 and the coil spring 4 serving as an extension thereof are continuously connected with high screw accuracy. Then, the fastening bolt 2 can be smoothly screwed into the fastened member 1.

  Since the distal end portion 23 of the male screw portion 22 and the one end 3 a of the support member 3 are coupled by the connecting means 5, the distal end portion 23 of the male screw 22 and the free end portion 4 a of the coil spring 4. Can be easily adjusted so as to be the same as the pitch of the male screw portion 22 of the fastening bolt 2, and the fastening bolt 2 and the coil spring 4 are smoothly screwed into the female screw 1a.

  When the fixing member A is removed from the fastened member 1, when the fastening bolt 2 is rotated in a direction opposite to the screwing direction, the free end portion 4 a of the coil spring 4 is provided on the support member 3. Since it abuts against 3c, the diameter of the coil spring 4 can be easily reduced, and the fastening bolt 2 can be easily removed.

  The present invention is capable of reliably preventing loosening due to vibration of a fastened member and is easy to manufacture, and can be applied to fastening bolts that are screwed into various fastened members.

DESCRIPTION OF SYMBOLS 1 Fastened member 1a Female screw hole 2 Fastening bolt 21 Head 22 Male screw part 22a Starting point 23 of a screw processing start End part 3 Support member 3a One end 3b Other end 3c Locking part 4 Coil spring 4a Free end (one end side)
4b Fixed end (other end side)
5 Connection means 5a Convex part 5b Concave part 6 Serration A Fixing member

Claims (3)

  A fastening bolt having a male screw portion screwed into a female screw hole of a member to be fastened, wherein one end of a support member having a smaller diameter than the outer diameter of the male screw portion is connected to a distal end portion of the fastening bolt via a connecting means. A coil spring having a pitch matching the pitch of the male screw portion of the fastening bolt is disposed on the outer periphery of the support member, one end side of the coil spring is a non-contact free end portion, and the other end side is the Loosening of a fastening bolt, characterized in that a fixed end portion held at the other end of the support member is used, and a tip of the free end portion of the coil spring is matched with a starting point of threading of the male screw portion of the fastening bolt. Stop device.   The front end portion of the bolt and the one end of the support member so that the distance between the front end portion of the fastening bolt and the free end portion of the coil spring is the same as the pitch of the male screw portion of the fastening bolt. The fastening bolt loosening prevention device according to claim 1, wherein:   The fastening bolt according to claim 1 or 2, wherein when the fastening bolt is rotated in a direction opposite to the screwing direction, a locking portion with which the free end portion of the coil spring abuts is provided on the support member. Anti-loosening device.

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