JP6382673B2 - Fastener - Google Patents

Description

  The present invention relates to a metal or resin fastener that fixes a male body and a female body by screwing, and more particularly to a fastener having a function of preventing loosening in a screwed state.

  As a fastener for fastening (stopper) when clamping a plurality of members or fixing one member to the other member, a fastener by screwing between a male screw and a female screw has been conventionally used. It has been. Typical examples of the fasteners by screwing include metal and resin bolts and nuts.

By the way, when fixing a male screw and a female screw by screwing, even if it is initially tightened, it may be loosened due to the influence of vibration or the like even if it is tightly tightened. For this reason, a fastening method provided with a mechanism for suppressing loosening has been proposed.
For example, Patent Document 1 discloses a fastening method in which a lock washer and a washer are fastened to a bolt or the like using a lock washer having a special shape.
In addition, in the holding bolt that is screwed into the female screw machined into the machine body and fastens the object to be fastened to the main body, a loosening prevention screw having a pitch larger than the pitch of the tightening screw is provided at the upper end of the fastening screw screwed into the female screw. The nut body that is screwed onto this locking screw is assembled, and when the tightening screw is screwed in, the pressing force of the nut body against the member to be fastened is greater than the pressing force of the head of the holding bolt against the nut body The structure is disclosed in Patent Document 2.

Japanese Patent No. 4710089 Japanese Patent No. 4955741

The fastener described in Patent Document 1 uses a special washer to prevent loosening, and the fastener described in Patent Document 2 includes a female screw processed into a main body and a male screw of a fastening bolt. In addition, the nut body is used to prevent loosening.
In either case, it is excellent in that it can be surely prevented from loosening, but since the parts for preventing loosening are added, the number of parts increases, which is disadvantageous in terms of cost.
It is an object of the present invention to provide a fastener that can be easily fixed with only two parts, that is, a part processed with a male screw and a part processed with a female screw, and also has a function of preventing looseness. .

  The fastener of the present invention made to solve the above problems is a fastener comprising a male body and a female body, and the male body has a male base portion having an inner surface and a smaller diameter than the male base portion. The male body comprises a male body shaft portion that is erected from the inner surface of the male base portion and has a male screw engraved at least in the vicinity of the tip thereof. The female body includes a female base portion having an inner surface and an outer surface; The male body is erected from the inner surface of the body base, and has a female body shaft having a diameter larger than that of the male body shaft, passes through the female body shaft and opens to the outer surface of the female body base, A shaft hole into which the shaft portion is inserted is formed, and a dividing groove that divides a portion from the outer surface of the female base portion to a part of the female shaft portion into at least two along the axial direction of the shaft hole. The portion of the shaft hole formed to the depth where the dividing groove is formed has a male screw thread in the male body shaft portion. When a female screw having a screw groove diameter narrower than the diameter of the mountain is engraved and the male screw of the male shaft portion is screwed into the female screw portion of the narrow diameter, the female base portion is widened. In addition, the female screw portion having the narrow diameter is configured to exert a force that presses the male screw portion.

  According to the present invention, the portion extending from the outer surface of the female base portion to a portion of the female shaft portion is divided into a plurality of division grooves so that this portion can be elastically greatly expanded outward. It has become. Therefore, the male shaft portion is inserted into the shaft hole of the female body, and the male screw formed on the male shaft portion is screwed into the female screw formed on the portion up to the depth where the dividing groove of the shaft hole is formed. . At this time, when the screws start to engage with each other, a female thread with a thread groove diameter narrower than the thread diameter of the male thread is engraved. The shaft hole of the female base is widened by the groove so that it can be screwed together. In addition, since the male screw portion receives a force that presses inward from the female screw portion in the screwed state, the screwing state prevents the screwed state from loosening.

In the above invention, the female screw formed in the portion of the shaft hole up to the depth where the dividing groove is formed includes a tapered female screw that tapers as it approaches the outer surface of the female base. Also good.
According to this, the deeper the male screw is screwed into the tapered female screw in the shaft hole, the stronger the pressure contact force is received. The pressure contact force can be adjusted according to the depth to be formed.

Further, in the shaft hole of the female shaft portion where the split groove is not formed, a female screw made of a parallel screw having a screw diameter matching the male screw of the male shaft portion is engraved, It may be formed so as to be continuous with the tapered female screw.
According to this, the male body and the female body can be stably screwed together, and the guide from the parallel screw to the taper screw is smoothly performed. Is possible.

Sectional drawing which shows an example of the use condition of the fastener which concerns on this invention. The figure which shows the male part of the fastener of FIG. The figure which shows the female body part of the fastener of FIG. Sectional drawing which shows the female body of other embodiment of this invention.

The details of the present invention will be described below with reference to the drawings showing embodiments thereof.
FIG. 1 is a cross-sectional view showing a use state of a fastener 1 according to an embodiment of the present invention. The fastener 1 is composed of a pair of members including a male body 10 and a female body 20. The material of the fastener 1 is preferably made of metal, but may be made of resin. 2A is a front view of the male body 10, FIG. 2B is a plan view, FIG. 3A is a front view of the female body 20 (viewed from the direction of the dividing groove 26), and FIG. Is a plan view, and (c) is a cross-sectional view.

The male body 10 includes a disk-shaped male base portion 13 having a flat inner surface 11 and a convex outer surface 12, and a male shaft portion 14 erected from the inner surface 11.
The male body shaft portion 14 is engraved with a parallel screw male screw 15 having a constant diameter from the tip to the male body base portion 13.

  The female body 20 includes a disk-shaped female base 23 having a flat inner surface 21 and a convex outer surface 22, and a female shaft 24 erected from the inner surface 21. The shaft diameter of the female body shaft portion 24 is larger than the outer diameter of the male body shaft portion 14, and a shaft hole 25 that penetrates the female body shaft portion 24 in the axial direction and opens to the outer surface 22 is formed. .

  Further, the female body 20 extends from the outer surface 22 of the female body base 23 to a part of the female body shaft portion 24 (the depth indicated by the line SS ′ in FIGS. 1 and 3C). A dividing groove 26 for dividing the female body 20 is formed along the axial direction, and the female base portion 23 is divided into three by the dividing groove 26. By forming such a dividing groove 26, the female base 23 can be elastically deformed and can be greatly widened in the radial direction.

  The shaft hole 25 has an inner diameter that matches the outer diameter of the male body shaft portion 14 so that the male body shaft portion 14 can be inserted. A female screw 28 having a screw groove 27 narrower than the diameter of the thread 16 of the male screw 15 in a portion where the shaft hole 25 can be widened, that is, a portion from the outer surface 22 to a depth where the dividing groove 26 is formed. Is engraved.

Next, an operation when the male body 10 and the female body 20 are engaged and used will be described. Here, as a specific example, a case where the plate-like first member A and the second member B shown in FIG. 1 are clamped will be described.
First, the female body 20 is inserted into the through holes formed in the first member A and the second member B from the second member B side. Subsequently, the male shaft portion 14 of the male body 10 is inserted into the shaft hole 25 of the female body 20 from the first member A side. At this time, when the male screw 15 is pushed in until the tip of the male screw 15 comes into contact with the tip of the female screw 28, the diameter of the thread 16 of the male screw 15 is larger than the diameter of the screw groove 27 of the female screw 28. receive. When the male screw 15 is further screwed in, the shaft hole 25 from the outer surface 22 of the female body 20 to the depth (SS ′) of the portion where the dividing groove 26 is formed is widened and is screwed into the female screw 28. become. As the screw is further screwed in, the male screw 15 comes into pressure contact with the female screw 28 by the reaction of the widened portion. Therefore, the screwing portion is strongly fixed, and the loosening of the screw is suppressed.

  FIG. 4 is a cross-sectional view of a female body 30 which is another embodiment of the present invention. In addition, about the same part as the female body 20 of FIG. 3, a part of description is abbreviate | omitted by attaching | subjecting the same code | symbol. It is assumed that the same male body 10 as that of the previous embodiment is also screwed in the female body 30.

  A shaft hole 25 is formed in the female body 30, but a portion closer to the female body base portion 23 of the shaft hole 25 in which the dividing groove 26 is formed has a tapered shape that tapers toward the outer surface 22. Female screw 31 is formed. A female screw 32 of a parallel screw that can be screwed onto the male screw 15 is formed on the female body shaft 24 side, and the thread and groove of the female screw 31 and the female screw 32 are continuous with each other. Yes.

  When the female body 30 is used, the male screw 15 can be screwed into the tapered female screw 31 as it is by simply screwing the male screw 15 into the female screw 32. When the male screw 15 is screwed deeply to the depth of the female screw 31, the shaft hole 25 is widened, and the male screw 15 is pressed by reaction, and the press contact force becomes stronger as it is screwed deeper. Is prevented.

  In this embodiment, the female screw 32 of a parallel screw is formed, but only the tapered female screw 31 may be provided in the portion where the dividing groove 26 is formed. In that case, if the diameter of the thread groove of the part into which the male screw 15 is screwed at the beginning of the female screw 31 is a taper screw having a diameter that can be screwed with the male screw 15, the screw can be screwed in without receiving a large resistance. it can.

  The exemplary embodiments of the present invention have been described above. However, the present invention is not necessarily limited to the above-described embodiments, and may be appropriately modified within the scope of achieving the object of the present invention and not departing from the scope of the claims. It is possible to change.

For example, in the above-described embodiment, an example in which the female body 20 is divided into three by the dividing groove 26 is shown. In other words, the effect of the present invention can be obtained if it is at least two or more.
Further, the male screw 15 does not need to be processed as a whole as long as it is processed at least near the tip of the male shaft portion 14.

  The present invention can be used as a fastener for inserting and screwing the male body side into the female body side.

DESCRIPTION OF SYMBOLS 1 Fastener 10 Male body 11 Inner surface 12 Outer surface 13 Male base part 14 Male shaft part 15 Male screw 16 Screw thread 20 Female body 21 Inner surface 22 Outer surface 23 Female body base part 24 Female body axial part 25 Shaft hole 26 Division | segmentation Groove 27 Thread groove 28 Female screw 30 Female body 31 Female screw (tapered screw)
32 Female thread (parallel thread)

Claims (3)

A fastener comprising a male body and a female body,
The male body includes a male base portion having an inner surface, and a male shaft portion that is smaller in diameter than the male base portion and is erected from the inner surface of the male base portion and in which a male screw is engraved at least near the tip. Become
The female body comprises a female body base portion having an inner surface and an outer surface, and a female body shaft portion that is erected from the inner surface of the female body base portion and has a larger diameter than the male body shaft portion. A shaft hole is formed through the part and opening on the outer surface of the female body base to insert the male body shaft part,
A dividing groove is formed to divide a portion from the outer surface of the female body base portion to a part of the female body shaft portion into at least two along the axial direction of the shaft hole,
In the portion of the shaft hole up to the depth at which the divided groove is formed, a female screw having a thread groove diameter narrower than the diameter of the thread of the male screw in the male shaft portion is engraved,
When the male screw of the male shaft portion is screwed into the female screw portion having the narrow diameter, the female base portion is widened and the female screw portion having the narrow diameter presses the male screw portion. A fastener characterized by being configured to exert force.   2. The fastening according to claim 1, wherein the female screw formed in the portion of the shaft hole up to the depth where the dividing groove is formed includes a tapered female screw that tapers as it approaches the outer surface of the female base. Ingredients.   In the shaft hole of the female shaft portion where the dividing groove is not formed, a female screw made of a parallel screw having a screw diameter matching that of the male screw of the male shaft portion is engraved, and the taper The fastener according to claim 2, wherein the fastener is formed so as to be continuous with the internal female screw.

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