JP2009074613A - Fastening fastener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening fastener which enables fastening by access only from one side of a member and which forms a large bearing surface, and which has a broad scope of application with respect to the thickness of the member to be fastened. <P>SOLUTION: The fastening fastener 1 is provided with a female screw member 3 and a male screw member 2 which can be screwed into the female screw member 3. A notch 35 is provided to one end of the female screw member, and is extended from the edge end in a fixed distance. The male screw member 2 has a screw head 21 constituted at one end so that its radius gradually becomes larger from the male screw part to its edge end, and a screw driver part 22 provided at the other end. The size of the cross section of the screw head is smaller than that of the cross section of the through holes A1, B1 provided to the members A, B to be fastened respectively. The female screw member part with the notch provided is brought into contact with the screw head, and is radially spread by screwing the male screw member into the female screw member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fastening fastener.

  Generally, fasteners such as bolts and nuts are used to fasten two members to be fastened. Fasteners such as bolts and nuts usually need to be accessible from both sides of the fastened members mated to each other. That is, it is necessary to hold the nut on one side of the member to be fastened and screw the bolt on the other side. On the other hand, because of the structure of the member to be fastened, it may be accessible only from one side of the member to be fastened. In such a case, access and fasten only from one side of the member to be fastened. Fastening fasteners that can be used are used.

  As such a fastening fastener, for example, a one-side bolt including a female screw member having a female screw portion therein and a male screw member that can be screwed into the female screw member is known (Patent Document 1). The one-side bolt disclosed in Patent Document 1 is inserted into a through-hole formed in the fastened member in a state where the female screw member and the male screw member are screwed together. Thereafter, when the male screw member is screwed, the core pin provided at the tip of the male screw member compresses one end portion of the female screw member in the axial direction, and accordingly, one end region of the female screw member has a diameter. Plastic deformation to spread outward in the direction. The fastened member is fastened between the annular portion formed by the plastic deformation and the nut member provided at the other end of the female screw member.

JP 2005-214334 A JP 2002-276625 A

  Incidentally, in the one-side bolt disclosed in Patent Document 1, as described above, one end region of the female screw member is expanded radially outward by plastic deformation, but the extent of the expansion is limited. is there. For this reason, in such a fastening fastener, the surface of the annular portion formed by the above-described enlargement, which comes into contact with the member to be fastened, that is, the diameter of the seating surface of this annular portion is small. When the diameter of the seating surface is small as described above, the fastening fastener may come out of the through hole formed in the fastened member.

  Moreover, in the said fastening fastener, if it is going to form the cyclic | annular part of a suitable magnitude | size, a cyclic | annular part will always be produced in the same position in the axial direction of a female screw member. Therefore, in the same fastening fastener, the position where the annular portion is formed cannot be changed according to the thickness of the fastened member. For this reason, it may be necessary to change the fastening fastener used according to the thickness of the to-be-fastened member which should be fastened.

  Accordingly, an object of the present invention is a fastening fastener that can be accessed and fastened only from one side of a fastened member, and can form a wide seating surface so as not to come out of the fastened member. An object of the present invention is to provide a fastening fastener having a wide application range with respect to the thickness of the fastening member.

In order to solve the above problems, in the first invention, a fastening fastener for fastening a plurality of fastened members from one side of the fastened members, and a hollow female screw member having a female screw portion therein In the fastening fastener having a male screw member that can be screwed into the female screw member, a cutout extending from the edge of the female screw member by a certain distance is provided at one end portion of the female screw member, and the male screw member has one end portion. Having a screw head configured so that the radius gradually increases from the male screw portion toward the edge thereof, and having a screw-turning portion at the other end, and the cross-sectional size of the screw head of the male screw member is large. This is smaller than the cross-sectional size of the through hole for the fastening fastener provided in the member to be fastened, and the female screw member provided with the notch by screwing the male screw member into the female screw member. There has been configured to expand in a radial direction of the female screw member in contact with the screw head.
According to the first aspect, the portion of the female screw member provided with the notch (hereinafter referred to as “deformable portion”) spreads radially by screwing the male screw member into the female screw member. The distance between the distal ends of the radially deformable portions changes according to the degree to which the male screw member is screwed into the female screw member. If the male screw member is screwed into the female screw member, the distance between the tips of the deformable portions can be increased, and thus the diameter of the seating surface in contact with the member to be fastened can be increased.
Further, according to the first invention, the position or the like where the deformable portion starts to expand in the axial direction of the female screw member can be changed according to the extent to which the male screw member is screwed into the female screw member. For this reason, it is possible to fasten these fastened members to a thick member to be fastened even if the degree of screwing the male screw member is small, and conversely to the extent that the male screw member is screwed to a thin member to be fastened. By doing so, these members to be fastened can be fastened.

  According to a second invention, in the first invention, an annular member having an outer diameter larger than that of the through hole is provided at an end different from the end provided with the screw head of the female screw member.

  In 3rd invention, protrusion is provided in the surface contact | abutted to the to-be-fastened member of the said cyclic | annular member in 2nd invention.

  According to a fourth aspect, in the second or third aspect, the outer diameter of the annular member is a shape that can be engaged with a screwdriver tool.

  ADVANTAGE OF THE INVENTION According to this invention, the fastening fastener which can enlarge the diameter of the seat surface contact | abutted to a to-be-fastened member is provided so that it may not come off from a to-be-fastened member. In addition, the position where the deformable portion starts to expand in the axial direction of the female screw member can be changed according to the degree of screwing the male screw member into the female screw member, and thus a fastening fastener having a wide application range with respect to the thickness of the member to be fastened is provided. Is done.

  Hereinafter, embodiments of a fastening fastener of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of one embodiment of a fastening fastener of the present invention.

  As shown in FIG. 1, the fastening fastener 1 has two members, a male screw member 2 and a female screw member 3. The male screw member 2 has a male screw head 21 at one end thereof and a hexagonal screw portion (screw turning portion) 22 at the other end thereof. A male screw portion 23 is provided between the male screw head 21 and the hexagonal screw portion 22. The male screw head 21 is configured such that the radius gradually increases from the male screw portion 23 toward the edge of the male screw member 3. That is, the male screw head 21 is configured to expand in a tapered shape from the male screw part 23 toward the end of the male screw member 2. In the following description, this tapered portion is referred to as a tapered portion 24.

  On the other hand, the female screw member 3 is provided with a cylindrical hole 31 capable of receiving the male screw member 2 therein, and a female screw portion 32 that can be engaged with the male screw portion 23 of the male screw member 2 is provided at a part of the inner surface thereof. . A hexagonal screw portion (annular member) 33 is provided at one end of the female screw member 3, and the outer diameter of the hexagonal screw portion 33 is larger than the outer diameter of the cylindrical portion 34 of the female screw member 3. It is supposed to be.

  Further, at the end opposite to the end of the female screw member 3 provided with the hexagonal screw portion 33, the female screw member 3 extends from the edge of the cylindrical member 34 toward the end provided with the hexagonal screw portion 33. A plurality of slits 35 extending in the axial direction are provided. These slits 35 define a deformable portion 36 between adjacent slits 35. In the female screw member 3 of the present embodiment, one or a plurality of protrusions 37 are provided on the surface (hereinafter referred to as “opposing surface”) 38 of the hexagonal screw portion 33 on the side where the cylindrical portion 34 is provided. .

  The male screw member 2 and the female screw member 3 of this embodiment are formed of a metal material or a resin material. In particular, the members 2 and 3 are formed of a material that can deform the deformable portion 36 when the male screw member 2 is screwed into the female screw member 3 as described later.

  In the present embodiment, the hexagonal screw portion 22 is provided at the end of the male screw member 2 on the side opposite to the male screw head 21, but such a portion does not necessarily have to be hexagonal. For example, it is only necessary that the male screw member 2 can be screwed with some kind of tool such as a plus or minus screw hole or a hexagonal hole.

  Similarly, in the present embodiment, the hexagonal screw portion 33 is provided at the end of the female screw member 3 on the side opposite to the side where the slit 35 is provided, but such a portion is not necessarily hexagonal. Also good. For example, it is only necessary that the female screw member 3 can be screwed or held so as not to rotate with any tool, such as a plus or minus screw hole or a hexagonal hole. Furthermore, when the protrusion 37 is provided on the opposing surface of the hexagonal screw portion 33, the male screw member 3 may not be held by a tool. Conversely, when the male screw member 3 can be held by a tool, the projection 37 on the facing surface 38 may not be provided.

  Next, with reference to FIG. 2, the usage method of the fastening fastener 1 comprised in this way is demonstrated. FIG. 2 is a diagram illustrating a coupling procedure by the fastening fastener 1 when the fastened members A and B are coupled by the fastening fastener 1.

  First, as shown in FIG. 2A, the fastening fastener 1 is inserted into the through-holes A1 and B1 formed in the fastened members A and B with the male screw member 2 screwed into the female screw member 3 to some extent. Inserted. At this time, the male screw member 2 is at least capable of screwing the male screw member 2 with respect to the female screw member 3 by the hexagonal screw portion 22, that is, the hexagonal screw portion 22 of the male screw member 2 from the end of the female screw member 3. It is screwed into the female screw member 3 to the extent that it protrudes.

  Further, as can be seen from FIG. 2A, the male screw head 21 of the male screw member 2 needs to pass through the through holes A1 and B1 formed in the fastened members A and B. The outer diameter D1 of the portion 21 is smaller than the inner diameter D2 of the through holes A1 and B1. Further, the outer diameter D3 of the cylindrical portion 34 is also smaller than the inner diameter D2 of the through holes A1 and B1 so that the cylindrical portion 34 of the female screw member 3 can be inserted into the through holes A1 and B1. . On the other hand, the outer diameter D4 of the hexagonal screw portion 33 of the female screw member 3 is larger than the inner diameter D2 of the through holes A1 and B1 so that the hexagonal screw portion 33 does not enter the through holes A1 and B1. It is supposed to be. Accordingly, when the fastening fastener 1 is inserted into the through holes A1 and B1, the facing surface 38 of the hexagonal screw portion 33 comes into contact with the surface of the member B to be fastened.

  As shown in FIG. 2B, after the fastening fastener 1 is inserted into the through holes A1 and B1 until the facing surface 38 of the hexagonal screw portion 33 of the female screw member 3 comes into contact with the surface of the fastened member B. The hexagonal screw portion 22 of the male screw member 2 is rotated in the arrow R direction by a screwdriver such as a spanner. At this time, since the protrusion 37 is provided on the facing surface 38 of the hexagonal thread portion 33 of the female screw member 3, the female screw member 3 remains stationary even when the male screw member 2 is rotated. Even if the protrusion 37 is not provided, the female screw member 3 can be kept stationary by holding the hexagonal screw portion 33 of the female screw member 3 so as not to rotate with the screwdriver. . Accordingly, the male screw member 2 is moved downward in the axial direction of the female screw member 3 in FIG. 2 by the action of the male screw portion 23 and the female screw portion 32 that are screwed together.

  When the male screw member 2 is moved downward in the axial direction, the tapered portion 24 of the male screw member 2 contacts the tip of the deformable portion 36 of the female screw member 3. Thereafter, when the male screw member 2 is further moved downward in the axial direction, the deformable portion 36 of the female screw member 3 is radially expanded toward the radially outer side of the female screw member 3 by the tapered portion 24 of the male screw member 2, and eventually As shown in FIG. 2 (c), the deformable portion 36 that has been spread out contacts the surface of the fastened member A. Thereby, the to-be-fastened members A and B are fixed with respect to each other by the fastening fastener 1.

  At this time, since the deformable portion 36 is plastically deformed, even if the male screw member 2 is later loosened, the deformable portion 36 that has already been deformed does not largely return to the original, and the fastened members A and B It can hold | maintain in the state which couple | bonded together.

  As can be seen from the above description, the axial length of the slit 35 is such that when the deformable portion 36 is expanded, the diameter between the tips of the deformable portion 36 is at least the inner diameter of the through holes A1 and B1. The deformable deformable portion 36 is in contact with the upper surface of the fastened member B or the edge between the upper surface and the inner surface of the through hole B1 to join the fastened members A and B. The length is such that it can be held in a closed state.

  Further, in the above embodiment, the deformable portion 36 is formed by providing the slit 35. However, instead of the slit 35, for example, a notch 35 ′ as shown in FIGS. 35 ″ may be used. That is, in the present invention, if the deformable portion that extends outward in the radial direction can be formed by screwing the male screw member 2 into the female screw member 3, the deformable portion may be formed by any shape of cutout. Good.

  In the above description, D1, D2, D3, and D4 are the outer diameter or inner diameter of the screw head 21, the through holes A1 and B1, the cylindrical portion 34, and the hexagonal screw portion 33. It is assumed that the cross-sectional shape of the element is almost circular. Therefore, when the cross-sectional shape of these components is not circular, the explanation that the outer diameter D1 of the screw head 21 is smaller than the inner diameter D2 of the through hole A1 and B1 is that the cross section of the screw head 21 is the through hole A1, This means that it is within the cross section of B1, that is, the cross section size of the screw head 21 is smaller than the cross section sizes of the through holes A1 and B1.

1 is a side view of one embodiment of a fastening fastener of the present invention. It is a figure which shows the coupling | bonding procedure by the fastening fastener at the time of couple | bonding a to-be-fastened member with a fastening fastener. It is a side view which shows another embodiment of the internal thread member of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fastening fastener 2 Male thread member 3 Female thread member 22 Hexagon screw part (screwdriver part)
23 Male thread part 24 Tapered part 32 Female thread part 33 Hexagon screw part (annular part)
35 Slit (Notch)
36 Deformable part A, B Fastened member A1, B1 Through hole

Claims (4)

A fastening fastener for fastening a plurality of members to be fastened from one side of the members to be fastened, comprising: a hollow female screw member having a female screw portion therein; and a male screw member that can be screwed into the female screw member. In the fastening fastener to
One end of the female screw member is provided with a notch extending a certain distance from the edge, and the male screw member is configured so that the radius gradually increases from the male screw portion toward the edge at one end. The screw head has a screw-turned portion at the other end, and the cross-sectional size of the screw head of the male screw member is the cross-section of the through hole for the fastening fastener provided in the member to be fastened. The portion of the female screw member provided with the notch is in contact with the screw head and spreads in the radial direction of the female screw member by screwing the male screw member into the female screw member. Fastening fastener.   The fastening fastener according to claim 1, wherein an annular member having an outer diameter larger than that of the through hole is provided at an end portion different from an end portion where the screw head portion of the female screw member is provided.   The fastening fastener according to claim 2, wherein a protrusion is provided on a surface of the annular member that contacts the fastened member.   The fastening fastener according to claim 2 or 3, wherein an outer diameter of the annular member is configured to be engageable with a screwdriver tool.

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