JP2004270801A - Fastener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastener capable of mounting a ceiling material to a folding roof material in an easy and speedy manner. <P>SOLUTION: The fastener for fastening a panel part 11a of a mounting member 11 to a steel plate A includes a hexagon head bolt 1 and a locking nut 3 for screwing and fitting to a male screw 3 of a shaft 2 of the bolt 1. A cutting edge 7 for self-drilling is provided at a tip end of the shaft 2 of the bolt 1. Its dimensions are set so that relation of W1≤W2 is satisfied in the case that an outer diameter of the cutting edge 7 is W1 and a thread root diameter of the male screw 3 is W2. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fastener including a self-drilling bolt screwed into a plate material such as a steel plate.
[0002]
[Prior art]
Self-drilling screws are frequently used when screwing various members to each other or to steel plates. According to this, the screwing operation is easy, but since a lock nut or the like cannot be screwed into the screw after fastening, it is difficult to prevent loosening.
[0003]
In this regard, in the case of a normal headed bolt, the loosening after fastening can be achieved by screwing the lock nut to the male screw of the protruding bolt shaft. However, a through-hole is formed in a target steel plate or the like, and a bolt shaft is inserted into the through-hole. Therefore, it takes time and effort to provide the through-hole.
[0004]
For example, there is Patent Document 1 as a conventional example of attaching a ceiling material to a roof material. As shown in FIG. 9, this mounting structure includes a long suspension bolt 31 suspended on the mountain of the folded steel sheet roofing 15, and a lower end of the suspension bolt 31 via a hanger 17 and a field support 18. And a ceiling material 16 to be fixed. The suspension bolt 31 has external threads 32 and 33 at the upper and lower ends.
[0005]
[Patent Document 1]
JP-A-07-229232 (FIG. 1)
[0006]
[Problems to be solved by the invention]
There, first, a through hole is drilled from the outside of the upper surface of the crest of the folded roof material 15, a suspension bolt 31 is passed through the through hole, and a male screw 32 at the upper end of the through hole is formed outside the crest of the folded roof material 15. From above, and the suspension bolts 31 are hung downwardly from the hills in a retaining shape. Next, the hanger 17 is attached to the male screw 33 at the lower end of the suspension bolt 31 with lock nuts 35, 35, and the field support 18 is fixed to the hanger 17, and the ceiling material 16 is fixed to the field support 18.
[0007]
The problem is that a through hole is previously formed in the folded roof material 15 from the outside of the upper surface thereof, and the suspension bolt 31 is passed through the through hole. Therefore, at the time of forming the through hole, the arrangement state of the steel frame and the partition plate existing below the folded roof material 15 cannot be visually recognized, and even if the bent through hole is provided, the hanging bolt 31 is obstructed by the steel frame or the like. It can lead to situations where you can't hang down.
[0008]
Therefore, an object of the present invention is to obtain a fastener having a self-drilling function while being a headed bolt. In addition, a proposition of the present invention is to reliably exert a function of preventing loosening after fastening.
[0009]
[Means for Solving the Problems]
As shown in FIG. 1, the fastener according to the present invention includes a headed bolt 1 and a nut 5 screwed into a male screw 3 of a shaft 2 of the bolt 1 from a distal end side. Has a cutting blade 7 for self-drilling. Then, as shown in FIG. 2, when the outer diameter of the cutting blade 7 is W1 and the root diameter of the thread of the male screw 3 is W2, the dimensions are set so as to satisfy the relationship of W1 ≦ W2. Features. The plate to be cut through the bolt shaft 2 is not limited to the steel plate A in FIG. 1 and may be a plastic molded product.
[0010]
More specifically, a fastener for screwing a plate portion 11a of a mounting member 11 having a through hole 12 to a steel plate A, wherein a bolt with a head 1 and a male screw 3 of a shaft 2 of the bolt 1 are screwed. And a cutting blade 7 for self-drilling at the tip of the shaft 2 of the bolt 1, the outer diameter of the cutting blade 7 is W1, and the root diameter of the thread of the male screw 3 is W2. In this case, the dimensions are set so that W1 ≦ W2. As the steel plate A, a steel plate having a thickness of 0.25 to 1.0 mm is preferably used.
[0011]
[Action]
In FIG. 1, when the cutting blade 7 at the tip of the shaft is pressed against the steel plate A from below and rotated, the cutting blade 7 first drills a pilot hole 13 in the steel plate A. Subsequently, the inner peripheral surface of the opening of the prepared hole 13 of the steel plate A undergoes plastic deformation. Due to the relationship between the thickness and hardness of the steel plate A and the hardness of the male screw 3 of the bolt 1, the screw thread of the male screw 3 needs to be in a state where it is not deformed by being crushed. Finally, the nut 5 is passed through the cutting blade 7 to the male screw 3 at the tip of the bolt shaft 2 protruding on the steel plate A, and then screwed together. When the thickness of the steel plate A exceeds 1.0 mm, the male screw 3 acts on the inner peripheral surface of the opening of the pilot hole 13 to cause the male screw 3 to be deformed. 0.0 mm, preferably 0.8 mm or less.
[0012]
The present invention can be used only for fastening the bolts 1 and the nuts 5 in a state where two steel plates A and A are overlapped. Alternatively, it can also be used when the mounting member 11 as shown in FIG. 1 is mounted on the steel plate A. In this case, after the bolt shaft 2 is passed through the through hole 12 provided in the plate portion 11a of the mounting member 11 in advance, The bolt shaft 2 is made to penetrate one or two steel plates A by the cutting blade 7. If the through hole 12 is provided in advance in the plate portion 11a, the thickness of the plate portion 11a becomes out of the question, and it is sufficient if the length of the bolt shaft 2 is selected.
[0013]
【The invention's effect】
According to the present invention, it is possible to use the same treatment as an existing self-drilling screw without the need for a troublesome work of drilling a pilot hole such as when a tapping screw is used for a target plate member represented by the steel plate A. On the other hand, after the bolt shaft 2 is cut through the target plate member (steel plate A) with the cutting blade 7 while drilling the pilot hole 13, the nut 5 can be screwed into the male screw 3 on the protruding end side of the bolt shaft 2. Therefore, even if the locking function by the nut 5 operates and receives vibration or heat shrinkage, the fastening state of the mounting member 11 to the plate member can be reliably maintained.
[0014]
In the present invention, the outer diameter dimension W1 of the cutting blade 7 is set equal to or slightly smaller than the root diameter dimension W2 of the thread of the male screw 3 of the bolt 1 shaft 2. This prevents the external thread 3 from being crushed when the bolt shaft 2 is inserted into the steel plate A by moving the cutting blade 7 ahead. Therefore, the nut 5 can be screwed into the male screw 3 without any trouble.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 2 shows an embodiment of the fastener according to the present invention, which comprises a hexagonal head bolt 1 and a nut 5 screwed to the male screw 3 of the shaft 2 of the bolt 1. The bolt 1 has a hexagonal head 6 for rotating operation, and a cutting blade 7 for self-drilling is formed at the tip of the shaft 2.
[0016]
In FIG. 2, the bolt 1 is dimensioned so as to satisfy the relational expression of W1 ≦ W2 when the outer diameter of the cutting blade 7 is W1 and the root diameter of the thread of the male screw 3 is W2. The outer diameter dimension W3 of the thread in the female screw 9 of the nut 5 is slightly larger than the root diameter dimension W2 of the male screw 3.
[0017]
Next, a procedure for fastening the mounting member 11 to the steel plates A, A, whose ends are overlapped, using the fastener according to the present invention will be described. First, after the steel plates A and A are overlapped with each other, the plate portion 11a of the mounting member 11 is applied to the lower surface of the overlapped portion, and the cutting blade 7 of the bolt 1 is inserted into the through hole 12 of the plate portion 11a to perform cutting. The tip of the blade 7 is brought into contact with the lower surface of the steel plate A, the head 6 is gripped by the power tool, and the bolt 1 is rotated. Thus, the cutting blade 7 forms the pilot hole 13 in a penetrating manner in the two steel plates by its self-drilling function. At the same time, the bolt 1 is pushed up until the end surface of the bolt head 6 comes into contact with the lower surface of the lower steel plate A so that the tip of the male screw 3 of the bolt shaft 2 projects above the upper steel plate A. . At this time, the male screw 3 of the bolt shaft 2 engages with the inner peripheral surface of the opening of the pilot hole 13 previously drilled by the cutting blade 7 to apply plastic deformation. However, if the thickness of the steel sheet A is about 0.8 mm or less, it does not reach the point where the threading action is performed on the inner peripheral surface of the opening of the pilot hole 13.
[0018]
Thus, the nut 5 is screwed into the male screw 3 on the tip end side of the bolt shaft 2 protruding from the steel plate A from the cutting blade 7 side (above). Thereby, as shown in FIG. 1, both the steel plates A and A can be fastened in a superposed state by the head 6 and the nut 5 of the bolt 1, and the plate portion 11a of the mounting member 11 is fastened to both the steel plates A and A. Can be fixed.
[0019]
First Embodiment FIGS. 3 and 4 show a first embodiment of a structure for attaching a ceiling material 16 to a folded roof material 15 made of a 0.8 mm-thick painted steel plate using the fastener according to the present invention. Show. In this ceiling material mounting structure, the upper end of the vertically long ceiling suspension material 11 is bolted to the folded roof material 15 with the fastener of the present invention, and the lower end of the ceiling suspension material 11 is connected to the hanger 17 and the field support 18 through the ridge support 18. The ceiling material 16 is attached by a well-known method.
[0020]
The ceiling suspension member 11 here corresponds to the above-mentioned attachment member, and a horizontal plate portion 11a is formed at the upper end by bending at a right angle, and the through hole 12 is formed in this plate portion 11a. The folded roof material 15 here corresponds to the steel plate A described above.
[0021]
The folded roof material 15/15 bent and formed in an uneven shape is overlapped with the left and right ends vertically at the flat tops 15a / 15a, and the ceiling hanging material is placed on the flat tops 15a / 15a from below. The 11 plate portions 11a are fastened by the hexagon head bolt 1 and the nut 5 in the manner described above.
[0022]
In FIG. 4, an elastic waterproof seal 20 and a washer 21 that covers the upper surface of the waterproof seal 20 are interposed between the flat top 15 a of the upper folded roof material 15 and the nut 5.
[0023]
According to the above ceiling material mounting structure, since the bolts 1 are driven into the folded roof material 15 from the lower surface side, the arrangement of obstacles such as steel frames and partition plates below the folded roof material 15 can be improved. The ceiling hanger 11 can be attached while visually recognizing. Therefore, unlike the conventional embodiment (see FIG. 9) in which a through-hole is formed from the upper outside of the folded roof material 15 and then the suspension bolt 31 is driven in, there is no wasteful punching of the through-hole and the work efficiency of ceiling construction is improved. Can be achieved.
[0024]
Second Embodiment FIG. 5 shows a second embodiment of the present invention relating to the nut 5, wherein the nut 5 is integrally insert-molded into a hollow plastic decorative cap 22.
[0025]
That is, in the decorative cap 22, the outer surface of the upper portion 22a having the upper wall 23 is formed in a hexagonal rectangular tube shape, and the nut 5 is integrally embedded inside the cylindrical lower portion 22b whose diameter is increased. The nut 5 can be screwed onto the male screw 3 of the screw shaft 2 by engaging a tool such as a spanner with the upper portion 22a of the decorative cap 22 with respect to the screw shaft 2 of the hexagonal head bolt 1. In this fastening state, the tip end of the screw shaft 2 including the cutting blade 7 has entered the hollow interior 25 of the decorative cap 22. Reference numeral 26 denotes an elastic sealing material. The other configuration is the same as that of the first embodiment.
[0026]
According to the second embodiment, the front end of the screw shaft 2 and the entire outer periphery of the nut 5 are covered with the decorative cap 22, so that the appearance is good. The elastic sealing material 26 can also prevent rainwater from entering well. In the decorative cap 22 of the second embodiment, the outer surface of the upper portion 22a is formed in a cylindrical shape, and the outer surface of the lower portion 22b is formed in a rectangular cylindrical shape, so that a tool for rotating operation can be engaged with the lower portion 22b. You may do so.
[0027]
Third Embodiment FIG. 6 shows a third embodiment of the present invention, which is a modification of the second embodiment (FIG. 5). In this case, the decorative cap 22 is a cap nut 5 in which a screw hole having a female screw 9 is formed, and is entirely formed of a plastic material. The upper portion 22a of the decorative cap 22 has an upper wall 23 and an outer peripheral surface is formed in a circular cylindrical shape, and the enlarged lower portion 22b has a hexagonal outer peripheral surface and has a rectangular cylindrical shape to which a tool can be engaged. Is formed. According to this, when the screw hole of the decorative cap 22, that is, the nut 5 is fitted to the bolt shaft 2 from the tip end side, the female screw 9 is screwed with the male screw 3. The other configuration is substantially the same as that of the first embodiment.
[0028]
Fourth Embodiment FIG. 7 shows a fourth embodiment of the present invention, which is a modification of the third embodiment (FIG. 6). In this case, the decorative cap 22 is formed in a vertically long cylindrical shape having an upper wall 23, and a fin-shaped engaging piece 29 is formed on the inner peripheral surface of the internal cylindrical hole 27 in a vertically multi-stage shape. This decorative cap 22 also corresponds to the nut 5 in the present invention. According to this, when the decorative cap 22, that is, the nut 5 is fitted to the bolt shaft 2 from the distal end side and rotated, the engaging piece 29 acts as the female screw 9 and engages with the male screw 3. Since the other configuration is the same as that of the first embodiment, the same members are denoted by the same reference numerals and description thereof will be omitted.
[0029]
(Fifth Embodiment) FIG. 8 shows a fifth embodiment of a structure for attaching an eaves front door 30 that closes a substantially triangular opening surface to the folded roof material 15 using the fastener according to the present invention. Show. The eaves front door 30 is made of a painted steel plate having a thickness of 0.5 mm, and is formed of a press-formed product having a plate portion 30a bent at a right angle on an upper end thereof, and an end portion where the folded roof materials 15 overlap each other. The plate portion 30a is attached to the flat tops 15a, 15a with the fastener of the present invention.
[0030]
In order to attach the eaves front door 30 to the folded roof material 15 using the fastener of the present invention, the plate portion 30a of the face door 30 is applied to the flat top 15a of the folded roof material 15 from the lower surface side, and a hexagonal head is attached. The cutting blade 7 of the bolt 1 is abutted against the plate portion 30a from below, and the bolt 1 is rotated to cause the bolt shaft 2 to penetrate the plate portion 30a and then to the folded roof material 15 so that the tip end of the bolt shaft 2 is It is made to protrude above the folded roof material 15. Next, the nut 5 is screwed into the male screw 3 at the tip of the bolt shaft 2 protruding from the folded roof material 15 and fastened. The details of this fastening procedure are as described in the first embodiment. The eaves front door 30 in the fifth embodiment corresponds to the mounting member 11 according to the present invention.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view for explaining a method of using a fastener according to the present invention. FIG. 2 is an exploded view of components shown in FIG. 1. FIG. 3 is a sectional view of a first embodiment. FIG. FIG. 5 is a longitudinal sectional view of a second embodiment. FIG. 6 is a longitudinal sectional view of a third embodiment. FIG. 7 is a longitudinal sectional side view of a fourth embodiment. FIG. 8 is a fifth embodiment. FIG. 9 is a longitudinal sectional view showing a conventional example.
DESCRIPTION OF SYMBOLS 1 Bolt 2 Shaft 3 Male screw 5 Nut 9 Female screw 7 Cutting blade 11 Mounting member 11a Plate portion A of mounting member Steel plate W1 Outer diameter dimension of cutting blade W2 Root diameter dimension of male screw

Claims (2)

Including a headed bolt 1 and a nut 5 screwed into an external thread 3 of a shaft 2 of the bolt 1;
At the tip of the shaft 2 of the bolt 1, there is a cutting blade 7 for self-drilling,
A fastener characterized in that when the outer diameter of the cutting blade 7 is W1 and the root diameter of the thread of the male screw 3 is W2, the relationship W1 ≦ W2 is satisfied. A fastener for screwing a plate portion 11a of a mounting member 11 having a through-hole 12 to a steel plate A, comprising a headed bolt 1 and a nut 5 screwed to a male screw 3 of a shaft 2 of the bolt 1. Including
At the tip of the shaft 2 of the bolt 1, there is a cutting blade 7 for self-drilling,
A fastener characterized in that when the outer diameter of the cutting blade 7 is W1 and the root diameter of the thread of the male screw 3 is W2, the relationship W1 ≦ W2 is satisfied.

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