JPH0334426B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) This invention provides a method for attaching a non-conductive member to a non-conductive member by penetrating a metal stopper through the non-conductive member and electrically welding its tip to a metal base material. The present invention relates to a welding device that connects a metal base material and a metal base material.

(Prior Art) Floors of prefabricated houses and the like are constructed by connecting a board (non-conductive member) to an H steel (metal base material). In order to connect the above board to the H steel, the applicant developed a welding device 1' as shown in FIG.
No. 109600). To explain in detail, this welding device 1' includes a capacitor (welding machine main body) 2
and an automatic driver 3',
The automatic screwdriver 3' has a rotary bit 7'. When connecting the board 55 to the H steel 56, the board 55 is first stacked on the H steel 56.
One electrode of the capacitor 2 is connected to the H steel 56 via the contact holder 6, and the other electrode is connected to the rotary bit 7' of the automatic screwdriver 3'. Next, the tip 7a' of the rotary bit 7' is inserted into the locking hole 53b formed in the top surface 53a of the head portion 53 of the wood screw 50 (metal fastener). From this state, the wood screw 50 is rotated by the automatic screwdriver 3' and screwed into the board 55 to penetrate it. When the tip 51 of the wood screw 50 reaches the H steel 56, electricity is passed from the capacitor 2 between them and both Generate a spark between them and weld.

(Problems to be Solved by the Invention) In the welding device 1', electricity from the capacitor 2 is supplied to the wood screw 50 via the rotary bit 7'.
Since the contact area between a' and the locking hole 53b of the wood screw 50 is small, and in some cases it becomes a point contact, resulting in a large electrical resistance, sparks may occur between them and welding may occur. In addition, the tip 51 of the wood screw 50
There is not enough spark between the and H steel 56,
In some cases, reliable connections were not made.

(Means for Solving the Problems) This invention has been made to solve the above problems, and its gist is to screw a metal fastener into a non-conductive member while rotating it with an automatic screwdriver. In the apparatus for connecting a non-conductive member and a metal base material by electric welding by flowing electricity from the welding device main body between the two with the tip almost reaching the metal base material, the above-mentioned automatic The screwdriver includes a driver body, a rotary bit provided in the driver body whose tip is inserted into a locking hole formed in the head of the metal stopper to rotate, and a rotary bit that is inserted into the rotary bit and rotates. The welding device main body includes a collar that contacts the head of the metal stopper, and an elastic body that is interposed between the driver body and the collar and biases the collar toward the head of the metal stopper. The welding device is characterized in that one electrode is electrically connected to the collar.

(Function) Layer a non-conductive member on a metal base material. One electrode of the welding machine body is connected to the collar. Connect the other electrode of the welding machine body to the metal base material. Next, insert the tip of the rotary bit of an automatic screwdriver into the locking hole formed in the head of the metal stopper, bring the collar and the head of the metal stopper into contact with the force of the elastic body, and then The metal stopper is rotated by a rotary bit and screwed into the metal base from the surface of the non-conductive member. Then, when the tip of the metal stopper approximately reaches the metal base material, electricity is passed between the two. Furthermore, the solidification of the molten metal caused by this current connects the non-conductive member to the metal substrate.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on the drawings from FIG. 1 to FIG. 5.

Reference numeral 1 in FIG. 1 is a welding device, and a wood screw 50
(metal fastener) to board 55 (non-conductive member)
By electrically welding the tip 51 to the H steel 56 (metal base material) as a beam,
It connects the board 55 and the H steel 56. This welding device 1 includes a capacitor 2 (welding device main body) and an automatic driver 3.

Capacitor 2 has a pair of cables 4 and 5. A contact holder 6 is provided at the tip of one cable 4.

The automatic screwdriver 3 includes a driver body 10 that is provided with a rotary bit 7 and a switch 9 and also has a built-in clutch 8, a collar 20 that is inserted through the rotary bit 7 and comes into contact with a head portion 53 of a wood screw 50,
An annular ring 30 that is inserted into the rotary bit 7 and comes into contact with the collar 20, and a coil spring 40 (elastic body).

The rotary bit 7 has a pointed tip 7a with a cross-shaped cross section, and is similar to the head 53 of the wood screw 50.
The switch 9 is inserted into a locking hole 53b formed on the top surface 53a of the switch 9.
It is designed to rotate by electricity when it is turned on. Furthermore, collar portions 7b, 7b are formed near the tip 7a of the rotary bit 7. clutch 8
is linked to the rotating bit 7, and can be turned off when a certain torque is exceeded.

The collar 20 is made of copper, for example, and has a large diameter head 21 and a small diameter tip 22. Also,
In the center thereof, there is provided an insertion hole 23 through which the rotary bit 7 is inserted. The distal end surface 22a of the distal end portion 22 is formed flat, and its outer diameter is approximately the same or slightly smaller than the outer diameter of the flat top surface 53a of the head portion 53 of the wood screw 50. are now in face-to-face contact. Furthermore, the insertion hole 2
A pair of vertical grooves 2 are formed on the inner circumferential surface of the tip 22 of 3.
4 and 24 are formed facing each other. Horizontal grooves 25, 25 are provided at the ends of the vertical grooves 24, 24 on the head 21 side.
are formed in series, and are adapted to lock the collar portions 7b, 7b of the rotary bit 7.

One end surface 30a of the annular ring 30 is in surface contact with the flat top surface 21a of the head 21 of the collar 20. The annular ring 30 is made of aluminum, for example, and has an insertion hole 31 in the center of which the rotary bit 7 is inserted. Further, one electrode of the capacitor 2 is electrically connected to the annular ring 30 via a cable 5.

The coil spring 40 is interposed between the annular ring 30 and the driver body 10, and one hook portion 41 of the coil spring 40 is connected to the other end surface 30b of the annular ring 30.
The other hook portions (not shown) are respectively latched to the end faces of the driver body 10.

In the welding device 1 configured as described above, the automatic driver 3 is assembled as follows. That is, the coil spring 40 to which the annular ring 30 is fixed is fixed to the driver body 10. Next, the rotating bit 7 is attached to the driver body 10, and the collar 20 is inserted into the rotating bit 7. At this time, both flanges 7b, 7b of the rotary bit 7 are inserted into the pair of vertical grooves 24, 24 of the collar 20. Then, the collar 20 is rotated as shown by arrow A in FIG. 3, and both flanges 7b, 7b of the rotary bit 7 are hooked into the pair of lateral grooves 25, 25 of the collar 20. Due to the elastic force of the coil spring 40, one end surface 30a of the annular ring 30 comes into surface contact with the top surface 21a of the head 21 of the collar 20. At this time, since the width of the flange 7b of the rotary bit 7 is smaller than the width of the lateral groove 25 of the collar 20, the collar 20 can be moved in the axial direction by a distance h relative to the rotary bit 7.

The driver body 10 is commercially available, and the driver body 10 is equipped with a coil spring 40,
The automatic screwdriver 3 can be obtained simply by assembling the annular ring 30 and collar 20. The rotary bit 7 can be obtained by crushing a commercially available bit to form the flange 7b.

A case will be described in which a floor of a prefabricated house or the like is manufactured using the automatic driver 3 assembled as described above. Note that the board 55 is made of a non-conductive and non-flammable (or flame-retardant) material such as hard wood cement material.

As shown in FIG. 1, a board 55 is stacked on the H steel 56 with a rubber vibration isolation plate 57 interposed therebetween. The other electrode of the capacitor 2 is electrically connected to the H steel 56 via the cable 4 and the contact holder 6. From this state, insert the tip 7a of the rotating bit 7 of the automatic screwdriver 3 into the locking hole 5 of the head 53 of the wood screw 50.
3b, and apply the tip 51 of the wood screw 50 to the surface 55a of the board 55. Next, the switch 9 of the automatic screwdriver 3 is turned on, and while the wood screw 50 is rotated by the rotary bit 7, it is screwed from the surface 55a of the board 55 toward the H steel 56. At this time, due to the elastic force of the coil spring 40, the annular ring 30 and the collar 20 are always urged toward the head portion 53 of the wood screw 50, and one end surface 30a of the annular ring 30 is pressed against the top surface 21 of the head 21 of the collar 20.
As shown in a, the tip surfaces 22a of the tip portions 22 of the collars 20 are in surface contact with the top surfaces 53a of the head portions 53 of the wood screws 50, respectively. Note that since the collar 20 is movable in the axial direction by a distance h with respect to the rotating bit 7, the elastic force of the coil spring 40 is applied to the wooden screw 50.
can be transmitted to.

The collar 20 rotates together with the rotating bit 7 and does not move relative to the wood screw 50. Further, since the annular ring 30 is fixed to the driver body 10 via the coil spring 40, it does not rotate but slides against the rotating collar 20.

Then, as shown in FIG. 4, the wood screw 50
When the tip 51 of passes through the board 55 and the vibration isolation plate 57 and almost reaches the H steel 56, the capacitor 2 is connected to the cable 5, the annular ring 30, the collar 20, the wood screw 50, the H steel 56, the contact holder 6, An electric circuit is formed that returns to the capacitor 2 via the cable 4, and the electricity stored in the capacitor 2 flows instantaneously and sparks between the wood screw 50 and the H steel 56, which have the highest resistance in the electric circuit. Note that the spark time is about 4/1000 seconds.

The distal end surface 22a of the distal end portion 22 of the collar 20 and the top surface 53a of the head portion 53 of the wood screw 50 have a sufficient contact area and are in contact in a relatively stationary state, so there is no spark between these surfaces. rarely occurs. Further, one end surface 3 of the annular ring 30
0a and the top surface 21a of the head 21 of the collar 20 rub against each other, but because they are in surface contact over an area larger than the contact area between the collar 20 and the wood screw 50, almost no spark is generated. Even if a slight spark occurs, no welding will occur between the annular ring 30 and the collar 20 because they are made of aluminum and the collar 20 is made of copper, which are metals that cannot be welded together.

In addition, an annular ring 30, a collar 20, a wood screw 5
0, most of the current flows through these members, and almost no current flows between the rotating bit 7 and the wood screw 50, which have a poorer contact state than these, and sparks are generated. Since there is no spark, the inconvenience of welding due to this spark can be avoided.

After the spark starts, the automatic screwdriver 3 continues to screw in the wood screw 50 for a certain period of time, thereby melting the tip 51 of the wood screw 50 and a part of the H steel 56. When this molten metal 58 solidifies, a torque above a certain level is applied and the clutch is disengaged.
Rotation bit 7 of automatic screwdriver 3 stops turning. After this, turn off switch 9. the result,
As shown in FIG. 5, the tip 51 of the wood screw 50 is welded to the H steel 56, so that the board 55 can be easily connected to the H steel 56.

In this way, since the wood screws 50 are screwed in even after the spark starts, a predetermined amount of molten metal 58 is secured, and the connection between the board 55 and the H steel 56 can be made strong. Further, when the molten metal 58 cools to room temperature, the molten metal 58 and the wood screw 50 contract, and the board 55 is crimped by the head portion 53 of the wood screw 50, thereby making the connection stronger.

This invention is not limited to the above-mentioned embodiments, and various embodiments are possible. For example, the vibration isolation plate 57 may be omitted, and the rotating bit 7 of the automatic screwdriver 3 may be rotated by compressed air instead of electricity. Further, plywood or the like can be used as the hard non-conductive member. Even in this case, sparks are generated locally and there is little air, so no combustion occurs. moreover,
It can also be applied when manufacturing walls by connecting panels (non-conductive members) to crosspieces (metallic base materials).

(Effects of the Invention) As explained above, in this invention, the collar inserted through the rotary bit is used as an electrical path from the welding device main body, and moreover, the collar and the head portion of the metal stopper are connected. The elastic force of the elastic body allows reliable contact and a sufficient contact area. As a result, a spark is reliably generated between the tip of the metal stopper and the metal base material, welding them together, and the metal stopper securely connects the non-conductive member and the metal base material. can. Furthermore, since the rotary bit does not form an electrical path, no spark is generated between the rotary bit and the metal stopper, thereby preventing the inconvenience of welding the two together. Since the collar only needs to be inserted through the rotating bit, a commercially available driver body can be used.

[Brief explanation of drawings]

The drawings from FIG. 1 to FIG. 5 show an embodiment of the present invention, and FIG. 1 is a partial cross-section of the state immediately after the welding device has started to connect non-conductive members. Figure 2 is an enlarged sectional view of the tip of the automatic screwdriver, Figure 3 is a bottom view of the tip of the automatic screwdriver, and Figure 4 shows the tip of the metal stopper reaching the metal base material. FIG. 5 is a cross-sectional view showing the sparked state, FIG. 5 is a cross-sectional view showing the state after the connection is completed, and FIG. 6 is a partial cross-sectional view showing the connection work using a conventional welding device. 1... Welding device, 2... Capacitor (welding device main body), 3... Automatic screwdriver, 7... Rotating bit, 7a... Tip part, 10... Driver main body,
20...Collar, 22a...Tip surface, 40...Coil spring (elastic body), 50...Pin (metal stopper), 51...Tip portion, 53...Head portion, 53
a... Top surface, 53 b... Locking hole, 55... Board (non-conductive member), 56... H steel (metal base material).

Claims (1)

[Claims] 1 Screw the metal stopper through the non-conductive member while rotating it with an automatic screwdriver, and with the tip almost reaching the metal base material, conduct electric welding by flowing electricity from the welding device main body between the two. In the apparatus for connecting a non-conductive member and a metal base material, the automatic screwdriver includes a driver body and a locking hole provided in the driver body and formed in the head portion of the metal stopper. A rotary bit whose tip is inserted into the screwdriver and rotates; a collar that is inserted into the rotary bit and comes into contact with the head of the metal stopper; and a collar that is interposed between the driver body and the collar and the collar is made of metal. A welding device comprising: an elastic body that urges a head portion of the stopper; one electrode of the welding device main body is electrically connected to the collar.