Clinching stud bolt

Abstract

The present invention provides a clinching stud that allows the entire head to be embedded in the member to be press-fitted. [Solution] A clinching stud bolt 1 fixed to a member to be press-fitted, comprising a head 2, a shaft 3 connected to the head, and a plurality of recesses 4 drilled circumferentially on the seating surface 2a of the head, allows the member to be press-fitted to be filled into the recesses 4, so the head 2 can be completely embedded in the member to be press-fitted, making it possible to fix in a space-saving manner.

Description

Technical Field

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[0001] The present invention relates to a clinching stud bolt that is used by press-fitting the head of a clinching stud bolt into a pilot hole previously formed in a press-fitted member.

Background Art

[0002] Conventionally, as a press-fit screw, a clinching stud shown in Patent Document 1 is known. This clinching stud has a head and a shaft portion continuously provided with this head, and a male screw is formed on this shaft portion. Further, six lobe-shaped protrusions arranged in the radial direction are formed on the seating surface of the head, and the protrusions are configured to be embedded in the press-fitted member as the head is seated. Thereby, the relative rotation of the clinching stud is inhibited. Further, an annular groove is formed in the shaft portion at the connection portion with the head, and the press-fitted member that has flowed due to plastic deformation when embedding the protrusion into the press-fitted member flows into the annular groove. Thereby, the clinching stud is fixed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a shape in which protrusions are provided on the seating surface of the head like the above-mentioned clinching stud, since the thickness of the head increases, it is difficult to embed the entire head into the press-fitted member. For this reason, there was a problem that it could not be used in places where space saving was required.

[0005] The present invention was created in view of the above problems, and an object thereof is to provide a clinching stud bolt capable of embedding the entire head into a press-fitted member. [Means for solving the problem]

[0006] The above problem can be solved by a clinching stud bolt fixed to a press-fit member, comprising a head, a shaft portion connected to the head, and a plurality of recesses drilled circumferentially on the seating surface of the head.

[0007] Furthermore, it is preferable that the recess provided on the seat surface of the head has a circular opening.

[0008] Furthermore, it is preferable that the recess provided on the seat surface of the head has an open portion in which a part of its inner wall opens to the outer surface of the head. [Effects of the Invention]

[0009] According to the present invention, since the head is configured to have a recess provided on the seating surface and the press-fit member filled into it, the head can be completely embedded in the press-fit member, making it possible to fix it in a space-saving manner. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view of the clinching stud bolt according to the present invention. [Figure 2] This is a bottom view of the clinching stud bolt according to the present invention. [Figure 3] This is a cross-sectional view showing a portion of the clinching stud bolt according to the present invention. [Figure 4] This is a cross-sectional view showing the state of use of the clinching stud bolt according to the present invention. [Modes for carrying out the invention]

[0011] The configuration of the clinching stud bolt of the present invention will be described below with reference to the drawings. In Figure 1, 1 is a clinching stud bolt, and is composed of a circular head 2 having a predetermined thickness and a shaft portion 3 connected to the head 2. The portion connecting the head 2 and the shaft portion 3 is formed into a constricted portion 3a. Furthermore, an external thread 3b that can be screwed into an internal thread formed into a nut or the like is integrally molded on the outer circumferential surface of the shaft portion 3.

[0012] A recess 4 is formed in the seating surface 2a of the head 2. This recess 4 is circular in shape and has a tapered inner wall, and is recessed in a mortar-like shape relative to the seating surface 2a of the head.

[0013] Furthermore, as shown in Figure 2, the recesses 4 of the head portion 2 are arranged at equal intervals on the same circumference of the seat surface 2a at nine locations, meaning that the nine recesses 4 are arranged in a ring shape.

[0014] Furthermore, as shown in Figure 3, the outer circumferential surface of the head 2 is formed as an inclined portion that slopes toward the centerline of the shaft portion 3, and the recess 4 has an open portion 4a in which a part of its inner wall opens to the outer circumferential surface of the head 2. In other words, the open portion 4a of the recess 4 opens to the inclined outer circumferential surface of the head 2.

[0015] Furthermore, as shown in Figure 2, when an action occurs that causes the press-fit member W, which is filled in the recess 4, to move in the radial direction of a circle centered on the seat surface 2a, the edge 4b ​​of the open portion 4a of the recess 4 is configured to catch on the press-fit member W filled in the recess 4, and thus has the function of preventing the press-fit member W from shifting due to this action.

[0016] As shown in Figure 4, in order to fix the clinching stud bolt 1 to the member to be pressed in W, the shaft portion 3 is inserted into a pre-drilled hole in the member to be pressed in W, and then the seating surface 2a of the head portion 2 is pressed onto the surface of the member to be pressed in W, and the head portion 2 is completely embedded until the surface of the head portion 2 and the surface of the member to be pressed in W are on the same plane. At this time, it is preferable that the constricted portion 3a is also completely embedded in the member to be pressed in W.

[0017] According to the above clinching stud bolt 1, since the recess 4 provided in the seating surface 2a of the head 2 is configured to be filled with the press-fitting member W, the head 2 can be completely embedded in the press-fitting member W, so that it is possible to fix it in a space-saving manner.

[0018] Moreover, since the nine recesses 4 are provided independently, each is filled with the press-fitting member W, and a rotation-preventing effect is exhibited. In particular, by forming the recess 4 in a circular shape and arranging the centers of the nine recesses 4 all on the same circumference, a higher rotation-preventing effect is exhibited.

[0019] Furthermore, since a constricted portion 3a is provided at the connecting portion between the head 2 and the shaft portion 3, when the press-fitting member W is filled here, a retaining effect is exhibited.

[0020] In addition, since the recess 4 is provided with an opening portion 4a that opens on the outer peripheral surface of the head 2, it is excellent in the flow characteristics accompanying the plastic deformation of the press-fitting member W when the head 2 is pushed into the press-fitting member W. Therefore, the head 2 is easy to embed and can be applied to press-fitting members W of various materials.

[0021] Note that the specific configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

Explanation of Reference Numerals

[0022] 1 Clinching stud bolt 2 Head 2a Seating surface 3 Shaft portion 3a Constricted portion 3b External thread 4 Recess 4a Opening portion 4b Edge W Press-fitting member

Claims

1. A clinching stud bolt that is fixed to a member to be press-fitted, The head and The shaft portion connected to this head, Multiple recesses are formed circumferentially on the seating surface of the head, A clinching stud bolt characterized by being composed of the following.

2. The clinching stud bolt according to claim 1, characterized in that the recess provided on the seating surface of the head has a circular opening.

3. The clinching stud bolt according to claim 1 or 2, characterized in that the recess provided on the seating surface of the head has an open portion in which a part of its inner wall opens to the outer surface of the head.

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