JP2018159424A - One-side fastening bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-side fastening bolt that allows an engagement piece to properly engage with a back face of an object to be engaged and can exert high-fastening force.SOLUTION: A one-side fastening bolt includes: an engagement piece 30 capable of engaging with a back face of an object to be engaged; a rotation shaft 40 provided inside of an outline profile at a lateral face of the engagement piece 30; and a bolt body 10 formed with a first long hole 11 capable of storing the engagement piece 30 along an axial direction and a second long hole 12 for supporting the rotation shaft 40 so as to be movable along the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a one-side fastening bolt.

  Conventionally, when fastening another member to a member that does not reach the inside or the back side, a one-side fastening bolt may be used. As such a one-side fastening bolt, in Patent Document 1 below, a bolt body having a threaded portion at one end and a long hole formed along the axial direction at the other end, and an axial direction of the bolt body. A locking piece that is accommodated in the long hole when the long side direction is matched, and the edge of the long side of the locking piece has both outer sides with respect to the width direction of the long hole. A pair of rotation protrusions projecting from the rotation protrusion is formed on the long side edge opposite to the long side on which the rotation protrusions are formed. There is disclosed a blind bolt in which a pair of drop-out preventing projections are formed protruding at both outer sides with respect to the width direction of the long hole (see FIG. 15 of Patent Document 1).

Japanese Patent No. 3532559

  The prior art has a problem that when the hole diameter of the fastening object into which the bolt body is inserted is increased, the locking piece is not properly locked to the back surface of the fastening object. That is, in the above prior art, a wedge is driven into the edge of the long side of the locking piece to form a rotation projection, and this is hooked on the opening edge of the long hole of the bolt body to rotate the locking piece. The locking piece is likely to fall into the long hole and be inclined, and for example, the lower corner of the long side of the locking piece may be caught in the hole of the fastening object. Thus, unless the locking piece is properly locked to the back surface of the fastening object, the fastening force by tightening the nut cannot be sufficiently exhibited.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a one-side fastening bolt capable of appropriately locking a locking piece on the back surface of a fastening object and exhibiting a high fastening force.

  In order to solve the above-described problems, the present invention provides a locking piece that can be locked to the back surface of a fastening object, a rotary shaft that is provided on the inner side of an outer contour of a side surface of the locking piece, and the locking A one-side fastening comprising: a first elongated hole capable of accommodating the piece along the axial direction; and a bolt main body formed with a second elongated hole supporting the rotating shaft so as to be movable along the axial direction. Adopt bolts.

  Further, in the present invention, the center of the rotation shaft is provided on a short direction center line that bisects the length of the locking piece in the short direction on the side surface of the locking piece. Adopt the configuration.

  In the present invention, the center of the rotating shaft is provided at a position separated from a longitudinal center line that bisects the length of the locking piece in the longitudinal direction of the side surface of the locking piece. The configuration is adopted.

  In the present invention, in the state where the longitudinal direction of the side surface of the locking piece intersects the axial direction of the bolt main body, the locking piece is the first elongated hole in the axial direction of the bolt main body. When contacting the end, a configuration is adopted in which the rotating shaft is not in contact with the end of the second elongated hole in the axial direction of the bolt body.

According to the present invention, the rotation shaft is provided inside the outer diameter contour on the side surface of the locking piece, and the rotation shaft communicates with the inner surface of the first long hole that accommodates the locking piece. The hole is supported so as to be movable along the axial direction of the bolt body. Thus, although the rotation shaft can move in the axial direction of the bolt main body along the second long hole, it hardly moves in the direction intersecting the axial direction, so that the locking piece has the first length. It does not fall into the hole. In addition, the locking piece can move in the axial direction of the bolt body, and the locking piece receives the fastening force due to the tightening of the nut by contacting the end of the first elongated hole. Is not applied, and the fastening piece is prevented from being damaged and a high fastening force is obtained.
Therefore, in this invention, a locking piece can be appropriately locked to the back surface of a fastening object, and a high fastening force can be exhibited.

It is an external appearance perspective view which shows the one side fastening bolt in embodiment of this invention. It is sectional drawing which shows the state which the one side fastening bolt in embodiment of this invention has fastened the fastening target object. It is a side view which shows the one-side fastening bolt in embodiment of this invention. It is a top view which shows the one-side fastening bolt in embodiment of this invention. It is a side view which shows the locking piece in embodiment of this invention. The cross-sectional view which shows the state which has exhibited the fastening force by the tightening of a nut, (a) The sectional view which shows the state in which the one side fastening bolt in embodiment of this invention was inserted in the hole of the fastening object (a). is there.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing a one-side fastening bolt 1 in an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the one-side fastening bolt 1 in the embodiment of the present invention fastens the fastening object 100.
As shown in FIG. 1, the one-side fastening bolt 1 includes a bolt body 10, a nut 20, a locking piece 30, and a rotating shaft 40.

  As shown in FIG. 2, the one-side fastening bolt 1 fastens the first member 100 </ b> A and the second member 100 </ b> B that are the fastening object 100 from the front 101 side (one side) of the fastening object 100. A hole 103 is formed in the fastening object 100 from the front surface 101 to the back surface 102, and the bolt body 10 is inserted into the hole 103.

As shown in FIG. 1, the bolt main body 10 is formed with a slit 10a1 (minus groove) on the end face of one end portion 10a. Further, the bolt main body 10 is formed with a first long hole 11 and a second long hole 12 which will be described later at the other end portion 10b.
The nut 20 is screwed into the bolt body 10 from one end portion 10a and faces the front surface 101 of the fastening object 100 as shown in FIG.

  The slot 10a1 is used to grip the one-side fastening bolt 1 with a gripping device (not shown). Specifically, a minus-shaped gripping device is inserted into the minus groove of the slot 10a1 to grip the one-side fastening bolt 1. In the present embodiment, the shape is a minus shape. However, the shape is not limited to this as long as the grasping tool can be inserted and grasped. For example, a plus shape or a round shape may be used.

The locking piece 30 is locked to the back surface 102 of the fastening object 100 and receives a fastening force by tightening the nut 20. The locking piece 30 shown in FIG. 2 is in a state where it is properly locked to the back surface 102 of the fastening object 100, and the locking piece 30 is located above and below the hole 103 on the back surface 102 of the fastening object 100. Each position is touching.
The rotating shaft 40 rotatably supports the locking piece 30. The rotating shaft 40 is formed in a columnar shape, and is fixed to the locking piece 30 in a state of penetrating the locking piece 30.

Next, each component will be described in detail with reference to FIGS.
FIG. 3 is a side view showing the one-side fastening bolt 1 in the embodiment of the present invention. FIG. 4 is a plan view showing the one-side fastening bolt 1 in the embodiment of the present invention. FIG. 5 is a side view showing the locking piece 30 in the embodiment of the present invention.
3 and 4 indicates the central axis of the bolt main body 10.

  As shown in FIG. 4, the first long hole 11 described above is formed in the other end 10 b of the bolt body 10. The first long hole 11 extends in the axial direction of the bolt body 10 (the direction along the symbol A). One end portion 11a and the other end portion 11b in the axial direction of the first long hole 11 are formed in an arc shape in a plan view shown in FIG. 4, and a pair of the first long holes 11 extending in the axial direction. Both ends of the inner surface of the are connected. The first long hole 11 has a size capable of accommodating the locking piece 30 along the axial direction.

  Further, the second long hole 12 described above is formed in the other end 10 b of the bolt body 10. As shown in FIG. 3, the second long hole 12 extends in the axial direction of the bolt body 10. One end 12a and the other end 12b in the axial direction of the second long hole 12 are formed in an arc shape in a plan view shown in FIG. 3, and a pair of second long holes 12 extending in the axial direction. Both ends of the inner surface of the are connected. The second long hole 12 supports the rotary shaft 40 so as to be movable along the axial direction.

  As shown in FIG. 4, the second long hole 12 communicates with the inner surface of the first long hole 11. In other words, the second long hole 12 penetrates the bolt body 10 in the radial direction so as to cross the first elongated hole 11 that penetrates the bolt body 10 in the radial direction. The length L1 in the axial direction of the first long hole 11 (the length from one end 11a to the other end 11b) is the length L2 in the axial direction of the second long hole 12 (one end) 12a to the other end 12b).

  As shown in FIG. 5, the locking piece 30 is obtained by cutting out a part of a substantially rectangular member in a side view, and specifically, one corner of the rectangle is cut obliquely. An inclined surface 31 is provided. The inclined surface 31 is formed at the corner between the back surface 30b of the locking piece 30 and the top surface 30d when the opposing surface of the locking piece 30 locked (opposed) to the back surface 102 of the fastening object 100 is the front surface 30a. Is formed. In addition, the corner | angular part of the front 30a and the bottom face 30c of the latching piece 30 is formed in circular arc shape.

  As shown in FIG. 5, the rotation shaft 40 is provided inside the outer diameter contour on the side surface 30 e of the locking piece 30. The outer diameter contour on the side surface 30e of the locking piece 30 refers to a contour formed by the front surface 30a, the bottom surface 30c, the back surface 30b, the top surface 30d, and the inclined surface 31 of the locking piece 30. Specifically, the center O of the rotating shaft 40 is provided on a short direction center line C1 that bisects the length of the locking piece 30 in the short direction on the side surface 30e of the locking piece 30.

  The center O of the rotating shaft 40 is provided at a position separated from the longitudinal center line C2 that bisects the length of the locking piece 30 in the longitudinal direction of the side surface 30e of the locking piece 30. The center O of the rotating shaft 40 is located on the region side (the top surface 30d side) where the inclined surface 31 exists when the side surface 30e of the locking piece 30 is divided into two regions by the longitudinal center line C2. . In addition, the inclined surface 31 is located in the area | region side in which the back surface 30b exists, when the side surface 30e of the latching piece 30 is divided into two area | regions by the transversal direction centerline C1.

  Further, in the axial direction of the bolt body 10 shown in FIG. 4, a length L3 from the other end 11b of the first long hole 11 to the other end 12b of the second long hole 12 is shown in FIG. In the short direction of the locking piece 30, it is shorter than the length L 4 from the back surface 30 b of the locking piece 30 to the peripheral surface of the rotating shaft 40. Further, the length L1 in the axial direction of the first long hole 11 shown in FIG. 4 is the length L5 in the longitudinal direction of the locking piece 30 shown in FIG. 5 (from the top surface 30d to the bottom surface 30c of the locking piece 30). Is longer than (length).

Next, with reference to FIG. 6, a fastening operation using the one-side fastening bolt 1 having the above-described configuration will be described.
6A and 6B are sectional views showing a state in which the one-side fastening bolt 1 according to the embodiment of the present invention is inserted into the hole 103 of the fastening object 100, and FIG. 6B shows the fastening force by tightening the nut 20. FIG. FIG.

  When the fastening operation using the one-side fastening bolt 1 is performed, first, as shown in FIG. 6A, the locking piece 30 is accommodated in the first long hole 11 along the axial direction (in FIG. The other end 10 b of the bolt body 10 is inserted into the hole 103 of the fastening object 100. When the other end portion 10 b of the bolt body 10 protrudes from the hole portion 103 toward the back surface 102 side of the fastening object 100, the locking piece 30 rotates around the rotation shaft 40, and the upper and lower portions of the first elongated hole 11 are moved upward and downward. It protrudes from the opening (indicated by a solid line in FIG. 6A).

  As shown in FIG. 5, the rotating shaft 40 is provided inside the outer contour of the side surface 30 e of the locking piece 30. Further, the center O of the rotating shaft 40 is provided on a short direction center line C1 that bisects the length of the locking piece 30 in the short direction on the side surface 30e of the locking piece 30. The locking piece 30 has an inclined surface 31 on the back surface 30b side when the side surface 30e is divided into two regions by the short direction center line C1. Therefore, the center of gravity of the locking piece 30 is shifted from the center O of the rotating shaft 40 and exists on the front surface 30a side in the two regions in the short direction, and the locking piece 30 is rotated by the moment due to this. To do.

  Furthermore, the center O of the rotating shaft 40 is provided at a position separated from the longitudinal center line C2 that bisects the length of the locking piece 30 in the longitudinal direction of the side surface 30e of the locking piece 30. Specifically, the center O of the rotating shaft 40 is located on the region side where the inclined surface 31 exists (the top surface 30d side) when the side surface 30e of the locking piece 30 is divided into two regions by the longitudinal center line C2. It's off. Therefore, the center of gravity of the locking piece 30 exists on the bottom surface 30c side of the two regions in the longitudinal direction, and the locking piece 30 rotates by a moment due to this. Therefore, the locking piece 30 always rotates so that the bottom surface 30c side is down.

  Next, as shown in FIG. 6B, when the nut 20 is screwed toward the other end portion 10 b of the bolt body 10, the bolt body 10 is conversely separated from the front surface 101 of the fastening object 100 ( Move in the pulling direction). When the bolt main body 10 moves in the drawing direction, the front surface 30 a of the locking piece 30 supported by the other end 10 b of the bolt main body 10 comes into contact with the back surface 102 of the fastening object 100. When the nut 20 is further screwed, the locking piece 30 is guided in the axial direction along the second long hole 12 via the rotary shaft 40, and the back surface 30 b side is the other end of the first long hole 11. 11b is contacted.

  Thus, in the state where the longitudinal direction (the direction along the short direction center line C1 shown in FIG. 6) of the side surface 30e of the locking piece 30 intersects the axial direction of the bolt body 10, the locking piece 30 is In the axial direction of 10, the rotating shaft 40 is not in contact with the end portion 12 b of the second long hole 12 in the axial direction of the bolt body 10 when contacting the end portion 11 b of the first long hole 11. This is because the length L3 shown in FIG. 4 is shorter than the length L4 shown in FIG. 5, so that the fastening force due to tightening of the nut 20 is not locally applied to the rotary shaft 40. Can be.

  Thus, according to the present embodiment, the rotation shaft 40 is provided inside the outer diameter contour on the side surface 30 e of the locking piece 30, and the rotation shaft 40 is a first long hole that accommodates the locking piece 30. 11 is supported by the second elongated hole 12 communicating with the inner side surface of the bolt body 10 so as to be movable along the axial direction of the bolt body 10. The rotary shaft 40 can move in the axial direction of the bolt body 10 along the second long hole 12, but hardly moves in the direction intersecting the axial direction. Therefore, the locking piece 30 can be appropriately locked to the back surface 102 of the fastening object 100 as shown in FIG. 6B without falling into the first long hole 11. Further, the locking piece 30 is movable in the axial direction of the bolt body 10, and the locking piece 30 comes into contact with the other end portion 11 b of the first long hole 11, so A fastening force due to the tightening of the nut 20 can be received, a local load is not applied to the locking piece 30, and the locking piece 30 is prevented from being damaged, and a high fastening force is obtained.

  Therefore, according to the above-described embodiment, the locking piece 30 that can be locked to the back surface 102 of the fastening object 100, the rotary shaft 40 provided inside the outer contour of the side surface 30e of the locking piece 30, A bolt body 10 formed with a first elongated hole 11 capable of accommodating the locking piece 30 along the axial direction, and a second elongated hole 12 supporting the rotary shaft 40 movably along the axial direction; The one-side fastening bolt 1 capable of appropriately locking the locking piece 30 to the back surface 102 of the fastening object 100 and exhibiting a high fastening force can be obtained.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above embodiment, the inclined surface 31 is provided on the locking piece 30, but as described above, the center O of the rotating shaft 40 is in the longitudinal direction on the side surface 30 e of the locking piece 30. Since the moment acts as described above, it is not always necessary to provide the inclined surface 31 on the locking piece 30.

  Further, for example, in the above-described embodiment, the back surface 30b of the locking piece 30 has a curved surface shape in plan view so as to come into contact with the other end portion 11b (see FIG. 4) of the first elongated hole 11 in a wide area. It may be formed. Further, the back surface 30b of the locking piece 30 may be planar, and the other end 11b of the first elongated hole 11 may be planar as well.

DESCRIPTION OF SYMBOLS 1 One side fastening bolt 10 Bolt main body 11 1st long hole 11a End part 11b End part 12 2nd long hole 12a End part 12b End part 30 Locking piece 30e Side surface 40 Rotating shaft 100 Fastening object 101 Front surface 102 Back surface A Axis line C1 Center line in the short direction C2 Center line in the long direction

Claims (4)

A locking piece that can be locked to the back of the object to be fastened;
A rotating shaft provided inside the outer contour on the side surface of the locking piece;
A first elongated hole capable of accommodating the locking piece along the axial direction, and a bolt body formed with a second elongated hole supporting the rotating shaft so as to be movable along the axial direction. A one-side fastening bolt characterized by that.   The center of the rotating shaft is provided on a short-direction center line that bisects the length of the locking piece in the lateral direction on the side surface of the locking piece. The one-side fastening bolt described in 1.   The center of the rotating shaft is provided at a position separated from a longitudinal center line that bisects the length of the locking piece in the longitudinal direction of the side surface of the locking piece. Item 3. The one-side fastening bolt according to item 1 or 2. When the longitudinal direction of the side surface of the locking piece intersects the axial direction of the bolt body, the locking piece contacts the end of the first long hole in the axial direction of the bolt body.
The one-side fastening bolt according to any one of claims 1 to 3, wherein the rotation shaft is not in contact with an end portion of the second elongated hole in the axial direction of the bolt body.

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