JPS6233075A - Metallic stopper for linking hard member - Google Patents

Abstract

PURPOSE:To subject the metallic stopper which is penetrated to a non-conductive hard member with its rotating to electric welding to a base metal surely by forming the flange part passing the approximate center of the tip face on the tip face of the shank part of the metallic stopper. CONSTITUTION:Non-conducting hard member 30 is overlapped on a metal base 31. By rotating a metallic stopper 1 the hard member 30 is penetrated with being cut by the flange part 7a thereof. The coat 32 of the base metal 31 is then cut off with the flange part 7a at the tip face side of the metallic stopper 1. The tip part 7a, 7b, 5 of the metallic stopper 1 and one part of the base metal 31 are melted by passing electricity between the metallic stopper 1 and base metal 31 at the time when the flange part 7a at the tip face side of the metallic stopper 1 almost reaches to the metallic ground of the base metal 31. After starting the electrification the gap in the tip face 5 and base metal 31 is narrowed by advancing the stopper 1 further and a molten metal 35 is filled up without any gap between those. The shank part 4 of the stopper 1 can thus be welded electrically to the base metal 31 surely.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a metal stopper used when connecting a non-conductive hard member to a metal base material.

(Prior Art) The present applicant has developed a welding device 20 as shown in FIG. body)
21 and an automatic driver 24, and the automatic driver 24 has a rotating bit 25. Then, welding is performed using a metal fastener 40 in the shape of a wood screw as shown in FIGS. 8 and 9. For example, when connecting a board (non-conductive hard member) to a steel plate (metal base material), first, the board 30 is stacked on the steel plate 31.

One electrode of the capacitor 21 is connected to the steel plate 31 via the contact holder 29, and the Ikekata electrode is connected to the rotating bit 25 of the automatic screwdriver 24. Next, the tip portion 2Sa of the rotary bit 25 is inserted into the locking hole 41b formed in the top surface 41a of the head portion 41 of the metal stopper 40. From this state, remove the metal stopper 40 with the automatic screwdriver 2.
4, screw it through the board 30 while rotating it, and when the tip 42 of the metal stopper 40 almost reaches the steel plate 31, electricity is passed from the capacitor 21 between them to generate a spark between them, The tip 42 of the metal stopper 40 and a part of the steel plate 31 are melted. This molten metal 3
6 solidifies, the tip 42 of the metal stopper 40 becomes the steel plate 3.
1 and connected to the steel plate 31 (board 301).

(Problems to be Solved by the Invention) When the steel plate 31 is covered with a coating 32 such as paint or galvanization for preventing corrosion, the metal stopper 40 has the following problems:
Since the tip portion 42 was tapered and sharp, the coating 32 could not be scraped off, and this coating 32 caused welding defects. As a result, the welding between the two was insufficient, and the board 30 could not be reliably connected to the steel plate 31, leaving room for further improvement.

(Means for Solving the Problems) This invention has been made to solve the above problems, and its gist is to penetrate a non-conductive hard member while rotating and connect the tip to a metal base material. In the metal fastener that connects the hard member and the metal base material by electric welding, from the head portion to the shank portion (t'), the tip surface of the shank portion has approximately the center of the tip surface. A metal fastener for connecting a hard member, characterized in that it has a flange that can be passed through.

(Function) A non-conductive hard member is layered on a metal base material. The metal stopper is rotated and the hard member is penetrated while being cut by its flange. Then, the coating on the metal base material is scraped off with the flange on the tip side of the metal stopper. When the flange on the tip side almost reaches the fabric of the metal base material, electricity is passed between the two to melt the tip of the metal stopper and part of the metal base material. Solidification of this molten metal connects the hard member to the metal base material.

(Example) Hereinafter, an example of the present invention will be described based on the drawings of FIGS. 1 to 7.

Reference numeral 1 in FIGS. 1 and 2 is a metal stopper, which connects a board 30 (a non-conductive hard member) and a steel plate 31 (a metal base material). This metal fastener 1 is composed of a head portion 2 and a shank portion 4. The head portion 2 has an inverted conical shape, and a cross-shaped locking hole 2b is formed on the top surface 2a, and a stepped portion 3 is formed on the conical surface. The distal end surface 5 of the shank portion 4 is not sharp and is substantially flat over a wide area. A flange portion 7 a continuous from the tip surface 5 of the shank portion 4 to a part of the circumferential surface 6;
7c is formed. The flange portion 7a on the side of the tip surface 5 passes approximately through the center of the tip surface 5 and extends linearly in the radial direction.
A convex portion 7b having a sharp tip is formed in the center thereof. Further, the collar portion 7c on the peripheral surface 6 side extends linearly along the ring direction of the metal stopper 1.

Reference numeral 20 in FIG. 3 is a welding machine, which electrically welds the metal fastener 1 and the steel plate 31. This welding I! 20
are the capacitor (welding machine body) 21 and the capacitor 21
It is composed of a pair of cables 22 and 23 extending from the main body, and an automatic screwdriver 24. The automatic driver 24 includes a rotating bit 25° clutch 26. It has an interlock switch 27 and is connected to a near compressor 28.

Bit 25 indicates timer +/FF1I-';? when interlock switch 27 is ON. + Sudo +, 1tQ) - G convex M Shita Sufuno 1. It is connected to one electrode of the capacitor 21 via a fitting (not shown), and at the same time is rotated by the compression force of the near compressor 28. The clutch 26 includes a rotating bit 25
It can be cut in conjunction with. Other cable 2
A contact holder 29 is provided at the tip of 3.

The board 30 is attached to the steel plate 3 using the metal stopper 1 configured as described above.
1 will be explained with reference to FIGS. 3 to 6. Note that the board 30 is made of a non-conductive and non-flammable (or flame-retardant) material such as hard wood cement material. Further, the steel plate 31 is coated with a coating 32 by galvanizing or painting.
is provided. The metal stopper 1 is made of a material softer than the steel plate 31.

As shown in FIG. 3, a board 30 is stacked on a steel plate 31.

One cable 22 of the capacitor 21 is connected to the rotating bit 25 of the automatic screwdriver 24 as described above, and the other electrode of the capacitor 21 is connected to the steel plate 31 via the cable 23 and the contact holder 29. From this state, insert the tip 25a of the rotary bit 25 of the automatic screwdriver 24 into the locking hole 2 of the head 2 of the metal stopper 1.
b, and push the protrusion 7b of the collar 7 of the metal stopper 1 into the surface 30a of the board 30. The position of the metal stopper 1 can be easily determined by simply pushing the convex portion 7b into the surface 30a of the board 30.

Next, the interlocking switch 27 of the automatic screwdriver 24 is turned on, and the metal stopper 1 is screwed from the surface 30a of the board 30 toward the steel plate 31 while being rotated by the rotary bit 25. At this time, the convex part of the metal stopper 1? Since the board 30 is cut by the flanges 7 a and 7 e with b acting as an id, the shank part 4 of the metal stopper 1 passes through the board 30 smoothly. Further, as shown in FIG. 7, the stepped portions 3 of the head portion 2 form dish-shaped recesses 30b on the surface 30a of the board 30, so the head portion 2 is accommodated in these four portions 30b.

As shown in FIG. 4, the convex portion 7b of the metal stopper 1
If it hits 1, the detection circuit closes and starts the timer. Further, when the convex portion 7b penetrates the coating 32 of the steel plate 31 and hits the fabric of the steel plate 31, the metal stopper 1
This steel plate 31 is made of a softer material.
worn out by When the convex portion 7b is worn away, the flange portion 7a
approaches the steel plate 31, and the coating 32 is scraped off over a wide range by the flange 7a. A predetermined period of time elapses after the protrusion 7b of the metal stopper 1 contacts the steel plate 31 until the flange 7a completely scrapes off the coating 32 and contacts the fabric of the steel plate 31 over its entire length. With the above timer,
The electrode of the capacitor 21 and the rotating bit 25 are electrically connected, and a cable 22. Rotating bit 2
5. Metal stopper 1. Steel plate 31. Contact holder 29. An electric circuit returning to the capacitor 21 via the cable 23 is closed, and the electricity stored in the capacitor 21 flows instantaneously, causing a spark between the collar 7a and the steel plate 31, as shown in FIG. At this moment, due to the rotation of the metal stopper 1, the center part of the flange part 7a is closer to the steel plate 3 than the both sides thereof.
Since there is little relative movement with respect to flange 7a, sparks can always be generated at the center of flange 7a. Note that the spark time is approximately 4/100 seconds. This spark melts the flange portion 7a and tip surface 5 of the shank portion 4 of the metal stopper 1 and a portion of the steel plate 31. After the spark starts, the metal stopper 1 further advances to narrow the distance between the tip surface 5 and the steel plate 31, and the molten metal 35 is placed between them.
Fill it without any gaps. When this molten metal 35 solidifies, the rotational torque of the metal stopper 1 increases, the clutch 26 is disengaged, and the rotation bit 25 of the automatic screwdriver 24 no longer rotates.

After that, the interlocking switch 27 is turned OFF. As a result, as shown in FIG. 6, as the molten metal 35 solidifies, the tip of the shank portion 3 of the metal stopper 1 is welded to the steel plate 31, and the board 30 can be easily connected to the steel plate 31. .

Since the collar portion 7a of the metal stopper 1 completely scrapes off the coating 32 of the steel plate 31, the tip of the shank portion 4 of the metal stopper 1 can be reliably welded and fixed.

This invention is not limited to the above-mentioned embodiments, and various embodiments are possible. For example, it can be applied to the case where plywood (a non-conductive hard member) is connected to a steel plate.

(Effects of the Invention) As explained above, in the present invention, the flange on the tip side of the metal stopper can completely scrape off the film coated on the metal base material, and the film does not get in the way of welding. It never becomes. As a result, the tip of the metal stopper can be reliably welded to the metal base material, and the non-conductive hard member can be reliably connected to the metal base material. Moreover, since the metal stopper is penetrated while the flange is cutting the hard member, the hard member will not be cracked.

[Brief explanation of the drawing]

The drawings from FIG. 1 to FIG. 7 show an embodiment of the present invention, and FIG. 1 is a front view of the metal stopper, FIG. 2 is a side view of the metal stopper, and FIG. 3 is a side view of the metal stopper. Hard w1 flv article + ha brutality all ±1 佼 ← front bar Amu 1 n, punch 〒4gen M
J Honkai Shi na - A view shown in vertical V side, Figure 4 is a partially enlarged sectional view showing the state where the coating of the metal base material is scraped off with the tip of the metal stopper, and Figure 5 is the metal stopper. A partially enlarged sectional view showing the state in which the tip of the tool reaches the fabric of the metal base material and sparks, Figure 6 is a partially enlarged sectional view showing the state after the connection is completed, and Figure 7 shows the state after the connection is completed Figure, Figure 8,
Fig. 9 shows a conventional example, Fig. 8 is a partial cross-sectional view of the state immediately after starting the connection work of hard members using metal fasteners, and Fig. 9 shows the state after the connection is completed. FIG. DESCRIPTION OF SYMBOLS 1... Metal stopper, 2... Head part, 4... Shank part, 5... Tip surface, 7a... Flange part, 30...
- Board (non-conductive hard member), 31... steel plate (metal base material).

Claims (1)

[Claims] (1) In a metal fastener that connects the hard member and the metal base material by rotating and penetrating the non-conductive hard member and electrically welding the tip to the metal base material, the head portion and the shank are connected to each other. A metal fastener for connecting a hard member, characterized in that the shank portion has a flange formed on the distal end surface passing approximately through the center of the distal end surface.