JP2000107869A - Resistance stud welding handy puller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate excessively pulling of an electrode tip out of a recessed face of an object to be worked by fixing a porous disk to a head through a support member, freely reciprocating the electrode tip through the hole of the porous disk, making the lower part of the hole observable, passing the electrode tip through the hole and reciprocating it with a moving mechanism. SOLUTION: An electrode tip 14 is preferably formed to a welding handy puller head integrally with a power supply wire route and is turnably mounted by an electrode operation grip 15. The electrode tip 14 is passed through the hole of a porous disk 18 and is abutted on a recessed part of an object to be worked and is stud-welded. By gripping an upper hand grip 3 and a lower hand grip 10 with a hand, the electrode tip 14 is pulled up to restore the depressed recessed part to a state before being depressed. By turning the electrode operation grip 15, the electrode tip 14 is detached from the object to be worked. The porous disk 18 has a curved face corresponding to a desired curved face of the object to be worked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance stud welding handy puller which is used for implanting a stud electrode tip in a recessed portion of, for example, an automobile body and pulling out the recessed portion.

[0002]

2. Description of the Related Art Conventionally, in repairing a body of an automobile, a washer (for example, a thickness of 3 mm and a diameter of 30φ) detachably attached to a welding machine head is implanted into a recessed recess, and the welding head is detached from the washer. After that, the washer is hooked with the hook of the puller in the hole of the washer and pulled out with the puller, the dent is removed, the washer that has been planted is removed from the body, the coating is performed after polishing and repair is performed .

In addition, instead of a washer or a pin, a welding electrode tip of a welding head itself is implanted in a workpiece, and the welding head itself is mechanically pulled in a direction for manually removing the dent to repair the dent. .

In this method, when the recessed concave portion has just reached the position of the original surface, the pulling operation must be stopped. However, there is a drawback that the concave portion is excessively extended and is protruded in the opposite direction.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of observing the implantation process and the extension process without excessive pulling after the electrode tip is implanted on the concave surface of the workpiece. It is an object of the present invention to provide a resistance stud welding handy puller that prevents the pull-out of a wire and is easy to operate.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a resistance stud welding handy puller head in which a porous disk is fixedly provided at a predetermined interval by a support member, and the porous disk allows the electrode tip to freely advance and retreat. ,
The holes of the perforated disk have an arbitrary number of holes that can be observed below the perforated disk and have holes of any shape, and the electrode tip passes through one hole of the perforated disk of the resistance stud welding handy puller head. The problem is solved by providing a moving mechanism for moving back and forth.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings based on embodiments. In the drawings, members having the same or similar functions are given the same numbers.

1 to 5 show one embodiment of the resistance stud welding handy puller of the present invention. In the figure, reference numeral 1 denotes a support for the handy puller head main body, which comprises a left support plate portion and a right support plate portion which are bent and connected in a U-shape at a lower portion thereof. A notch or a through hole through which the electrode tip holder 2 can move is formed in the lower connecting portion 1 '.

Reference numeral 3 denotes an upper hand grip having a U-shaped cross section, with bolts 6, 7 and nuts 8, 9 between sleeve legs 4 and 5 with the U-shaped leg side walls facing downward.
Thus, the support 1 is fixed to the left support plate and the right support plate.

Reference numeral 10 denotes a lower hand grip having a U-shaped cross section. A coil spring 11 is interposed between the U-shaped leg side wall surface with the U-shaped leg side facing upward and facing the upper hand grip 3, thereby forming a coil of the coil spring. The bolt 12 is passed through the center hole to the left support plate and the right support plate of the support 1 using the bolt 12 and the nut 13.
Is mounted so as to be rotatable around the center. Coil spring 11
Has one leg in contact with the sleeve 5 in which the bolt 7 is inserted, and the other leg in contact with the bottom surface of the U-shaped leg side wall connecting portion of the lower hand grip 10. Of course, one of the leg portions of the coil spring 11 can be brought into contact with the U-shaped leg side wall connecting portion of the upper hand grip or by providing a protruding portion on the side wall portion. Further, the other end of the coil spring may be brought into contact with the protrusion formed on the U-shaped leg side wall instead of the U-shaped leg side wall connecting portion of the lower hand grip.

On the left and right support plate portions of the support 1,
A guide portion 1 '' for guiding the slider 21 so as to be slidable between the two support plates is formed by bending. The slider 21 is formed of a U-shaped cross-section member which is bent upward so as to abut at least a part of the upper surface of the U-shaped leg side wall of the lower hand grip 10. A hole through which the electrode tip holder 2 passes is formed on the surface, and the electrode tip holder 2 is rotatably mounted thereon with a nut via a washer. The slider 21 has cutouts 21 ′ formed on both side walls of the U-shaped cross section of the slider 21. The cut-out portion serves as a stopper for preventing the lower hand grip 10 from further expanding downward by the coil spring 11.

Reference numeral 14 denotes an electrode tip fixed to the electrode tip holder 2. Reference numeral 15 denotes an electrode operation grip for supplying a welding current to the electrode tip 14 and simultaneously operating the welding electrode tip holder 2 so as to be rotatable together with the electrode tip 14. A power supply cable can be detachably attached to the electrode operation grip 15.

Reference numerals 16 and 17 denote support legs fixed to the left and right support plate portions of the support plate of the support 1, for example, by welding. A perforated disk 18 is fixed to these support legs 16 and 17.
The perforated disk 18 is made of a rigid metal plate or an insulating plate. The outer peripheral edge of the perforated disk 18 is covered with a rubber ring or a plastic ring 19. This rubber ring or plastic ring is suitable for stable seating and arrangement on the workpiece surface in addition to the insulating action. Of course, this rubber or plastic ring can be omitted.

The hole at the center of the perforated disk 18 is sized so that the electrode tip can advance and retreat without contact. Other holes are drilled through this hole for viewing under the disk. In the figure, the hole is circular, but it can be elliptical or rectangular.

In the case of repairing a dent in the surface of a workpiece having a curvature that is not a flat surface, the porous disk may be configured so that the porous disk also has a corresponding curved surface. Therefore, it is possible to prepare a large number of perforated disks corresponding to the repaired surface of the workpiece, and to detachably attach the disk to the welding handy puller so that the disk can be replaced as needed and used. Of course, in this case as well, a rubber ring or the like can be attached to the outer periphery.

Next, the operation of the resistance stud welding handy puller constructed as described above will be described.

First, in FIG.
And the lower hand grip 10 is expanded by the spring force of the coil spring 11, and the slider 21 hits the cutout 21 ′ of the slider 21, and the lower hand grip 10
The electrode tip 14, which is pushed down by the slider 21 and attached to the slider 21 via the electrode tip holder 2, passes through the center hole of the porous disk 18 and protrudes below the porous disk.

The protrusion size can be adjusted by turning the lower hand grip 10 upward about the bolt 12. As shown in FIG. 4b, the protrusion dimension is set to be large enough to be able to butt against a concave portion 20 of a workpiece, for example, a body of an automobile, and the electrode tip 14 is pressed against the concave portion 20. Then, a welding current is passed between the electrode tip 14 and a ground terminal (not shown) of the workpiece, and the electrode tip 14 is recessed into the recess 20 of the workpiece.
(See FIG. 3b).

After the planted portion has cooled and hardened, the upper hand grip 3 and the lower hand grip 10 are squeezed by hand, thereby pulling up the electrode tip 14 as shown in FIG. Return to the state. At this return position, by manually applying a turning force to the electrode operating grip 15 as shown by a double arrow, a torsional force is applied to the site where the electrode tip 14 is implanted into the concave recess 20, and the electrode tip 14 is covered. It can be removed from the place where the workpiece is implanted.

According to the present invention, in this case, the perforated disk can be seated astride the recessed portion, and the restoration of the recessed portion can be performed while monitoring through the hole of the perforated disk.
In addition, by pressing the upper hand grip 3 downward with the thumb and palm, the workpiece is processed by the left support plate and the right support plate of the head body support 1 and the porous disk fixed to the support legs attached thereto. Pressing the lower hand grip 10 with four fingers while pressing it against the peripheral edge of the concave recessed portion, pulls it up. At this time, it is possible to pull up while seeing the concave recessed portion 20 through the hole of the porous disc, and the porous disc can be used as a pulling stopper surface of the recessed portion 20, so that the concave recessed portion 20 is excessively pulled up and is moved in the opposite direction. Overhang can be prevented. Further, it is easy to apply a turning force to the electrode tip 15 in the circumferential direction with the other hand to the electrode operation grip 15, and it is easy to take out the electrode tip from the workpiece.

FIG. 6 shows a second embodiment of the present invention.
The difference from the embodiment of FIG. 5 is that the electrode tip and the electrode holder are non-rotatably mounted on the slider and the power supply cable to the electrode tip is guided into the U-shaped recess of the upper hand grip. is there. In FIG.
Reference numeral 22 denotes a power supply cable, reference numeral 23 denotes a holding band for holding the power supply cable in the U-shaped cross-section concave portion,
Is a power cable connector plug.

In the embodiment shown in FIG. 6, the electrode tip 14 is implanted in the recessed portion of the workpiece, the upper and lower hand grips are squeezed to pull out the recessed portion to the original surface.
As in the embodiment, the electrode tip is removed from the implantation site by holding the upper hand grip 3 and the lower hand grip 10 while holding the upper hand grip 3 and the lower hand grip 10 such that a twisting force acts on the electrode tip 14 and the contact of the porous disc 18 is made. This is performed by applying a turning force to the entire welding handy puller below.

[0023]

As is apparent from the above description, according to the present invention, the resistance stud welding handy puller is arranged so that the perforated disk is positioned across the concave portion of the workpiece, for example, the automobile body, and the concave is formed. Since it is possible to confirm whether or not the welding electrode tip has come to an appropriate position while observing the recessed portion, the welding head can be easily and reliably positioned. Also, after the electrode tip is implanted, when the electrode tip is pulled out through the welding head, the perforated disk serves to support the peripheral portion of the body that is not dented, so that the effect of preventing deformation around the dented dent is effective. is there.

Further, when the implanted electrode tip is separated from the body surface, the welding handy puller is turned while the porous disc is kept on the body surface, so that the electrode tip is implanted between the implanted electrode tip and the body surface. There is an advantage that a torsional force is easily applied.

Moreover, the perforated disk has an advantage that it serves as a stopper for the body surface when the implanted electrode tip is pulled by the puller mechanism including the upper and lower hand grips and the concave body surface is returned to the original surface.

[Brief description of the drawings]

FIG. 1 is a perspective view of a resistance stud welding handy puller according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the resistance stud welding handy puller of the first embodiment shown in FIG. 1 when upper and lower hand grips are gripped.

3 shows a schematic longitudinal section through the first embodiment shown in FIG. 1;

FIG. 4 is a perspective view of a perforated disk applied to the present invention,
FIG. 2 is a schematic cross-sectional view showing a state where an electrode tip is implanted in a workpiece and a state where the implanted electrode tip is pulled up.

FIG. 5 is a schematic sectional view showing attachment of an electrode tip and an electrode tip holder to a slider and attachment of an electrode operation grip.

FIG. 6 shows a perspective view of a second embodiment of the resistance stud welding handy puller of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handy puller head main body 2 Electrode tip holder 3 Upper hand grip 4,5 Sleeve 6,7,12 Bolt 8,9,13 Nut 10 Lower hand grip 11 Coil spring 14 Electrode tip 15 Electrode operation grip 16,17 Support Leg 18 Perforated disk 19 Plastic ring 20 Depressed portion 21 Slider 22 Power supply cable 23 Retention band 24 Power supply cable connector plug 1 'Lower connecting portion 1 "Guide portion 21' Cut-out portion

Claims (6)

[Claims] 1. A resistance stud welding handy puller head is provided with a perforated disk fixedly provided at a predetermined interval by a support member. The perforated disk allows the electrode tip to freely advance and retreat, and the perforated disk has a perforated hole. An arbitrary number of holes that can be observed below the disk, having holes of any shape, and a moving mechanism that advances and retreats the electrode tip through one hole of the porous disk of the resistance stud welding handy puller head. A resistance stud welding handy puller, characterized in that: 2. The resistance stud welding handy puller according to claim 1, wherein the electrode tip is non-rotatably fixed to the resistance stud welding handy puller head. 3. The resistance stud welding handy according to claim 1, wherein the electrode tip is rotatably attached to the resistance stud welding handy puller head by an electrode operation grip formed integrally with a power supply line to the electrode tip. Pula. 4. The resistance stud welding handy puller according to claim 1, wherein the perforated disk is made of a rigid metal plate or an insulating plate having a circular, elliptical or polygonal shape. 5. The resistance stud welding handy puller according to claim 1, wherein the perforated disk has a curved surface corresponding to a desired curved surface of the workpiece. 6. A mechanism for moving an electrode tip provided on a resistance stud welding handy puller head so as to advance and retreat,
An upper hand grip fixed to the support, a lower hand grip rotatably fixed to the support, a coil spring interposed between the two hand grips, and sliding up and down by the lower hand grip. The resistance stud welding handy puller according to any one of claims 1 to 5, comprising a slider and means for attaching an electrode tip to the slider.