JP7108265B2 - welding torch - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding torch that is held by a worker during welding.

In semi-automatic welding, in which a worker grips the welder by hand, a tip part that generates an arc for welding is generally crimped to the tip of the torch cable that transmits the power supplied from the welding machine. A welding torch is used in which a torch body equipped with a is connected and fastened with a tightening screw. In such a welding torch, a metal connection member is covered with a resin torch handle, and a worker can hold the torch handle for welding.

In this way, since the metallic connecting member is covered by the torch handle held by the operator, it is possible to electrically insulate the operator holding the torch handle from current flow. The torch body and the connecting member are fastened by a tightening bolt (fastening member), and the torch handle is formed with an opening through which the tightening bolt faces the outside.

By inserting a tool such as a wrench into the opening of the torch handle and loosening the tightening bolt, the torch cable can be unfastened from the torch body. It can be fastened with the torch body. In addition, when the fastening bolt is loosened, the fastening bolt can be taken out from the opening of the torch handle.

A conventional welding torch has a rubber cover attached to the opening of the torch handle, as disclosed in Patent Document 1, for example. is configured to prevent contact with the Such a lid member is made of a rubber material having electrical insulation, is adapted to be fitted into the opening, and has a notch formed in a part thereof. The cover member can be removed from the opening by inserting a tool or the like into the gap created by the notch.

Japanese Unexamined Patent Application Publication No. 2009-725

However, in the above conventional technology, since the notch is formed in the lid member, the metal powder enters through the gap formed between the cover member and the opening, and the metal powder accumulates toward the opening. There is a risk that the current may be led to the vicinity of the torch handle. Also, if there is a slight gap between the cover member and the opening other than the notch, metal powder may enter through the gap and accumulate. On the other hand, if the notch is eliminated, the problem arises that the lid member becomes difficult to remove.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances. To provide a welding torch capable of

The invention according to claim 1 comprises a torch body for generating an arc at its tip, a torch cable for supplying power to the torch body, and a base of the torch cable and the torch body fixed to the tip of the torch cable. a connecting member made of metal for connecting ends, a fastening member for fastening or unfastening the torch body to the connecting member, and a torch handle that covers the connecting member and can be gripped by an operator. an opening formed in the torch handle to expose the fastening member to the outside; The lid member can be fitted into the opening, and has an insertion portion press-fitted into the inner peripheral wall of the opening, and a side projection from the insertion portion. and a head consisting of a flange formed by a saddle , and the insertion portion and the head are made of a rubber material or resin material having electrical insulation integrally formed, and the opening is formed by the opening edge. A convex portion is integrally formed along the portion, and in a state in which the lid member is attached to the opening portion, the back surface of the head portion is in contact with the tip surface of the convex portion so that the entire circumference of the inner peripheral edge of the opening portion is formed. characterized by covering the

The invention according to claim 2 is the welding torch according to claim 1 , wherein the head has a bent portion that is bent along an outer peripheral edge of the convex portion.

According to the first aspect of the invention, the lid member has the fitting portion that can be fitted into the opening and the head portion that protrudes laterally from the fitting portion. In this state, metal powder can be prevented from entering, and the lid member can be easily removed from the opening.

Further , according to the first aspect of the invention, the cover member is made of rubber or resin material having electrical insulation in which the insertion portion and the head portion are integrally formed. It is possible to smoothly attach and detach the lid member to and from the part.

Furthermore, according to the first aspect of the invention, the fitting portion can be press-fitted into the inner peripheral wall of the opening. can be prevented from falling off carelessly.

Furthermore, according to the first aspect of the invention, the opening has a convex portion integrally formed along the edge of the opening, and the head portion is the tip of the convex portion in a state where the cover member is attached to the opening. Since it can abut on the surface, it is possible to more reliably prevent metal powder from entering and to smoothly remove the cover member from the opening.

According to the invention of claim 2 , since the head has a bent portion that is bent along the outer peripheral edge of the convex portion, the lid member can be attached to the opening more firmly, and the metal powder can be removed. Intrusion can be prevented more reliably.

1 is an overall external view showing a welding torch (with a lid member attached) according to an embodiment of the present invention; FIG. Overall external view showing the same welding torch (with lid member removed) Overall view showing the internal configuration of the welding torch (with the torch handle and cover member removed) A three-sided view showing a lid member in the same welding torch The perspective view which shows the lid member in the same welding torch. Schematic diagram showing the dimensional relationship between the cover member and the opening in the same welding torch Schematic diagram showing a state in which a cover member is attached to the opening of the welding torch A cross-sectional view showing a state in which a cover member is attached to the opening of the welding torch. FIG. 4 is a cross-sectional view showing a state in which a cover member is attached to an opening of a welding torch according to another embodiment of the present invention; Schematic diagram showing a lid member in a welding torch according to still another embodiment of the present invention Schematic diagram showing a state in which the lid member of the welding torch is attached to the opening

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The welding torch according to the present embodiment is for welding while being held by an operator, and as shown in FIGS. , a torch handle 4, a cover member 5, and a lid member 6. The torch body 1 and the torch cable 2 are each covered with an insulating coating.

The torch body 1 is supplied with current through a torch cable 2 to generate an arc at the tip 1a to enable welding, and has a part that is gently curved with respect to the longitudinal direction. The torch cable 2 is connected to a welding machine (not shown) and consists of an electric wire for supplying electric power to the torch body 1. The torch cable 2 and the base end 1b of the torch body 1 are connected to the tip 2a thereof. A connecting member 3 made of metal for is fixed.

The connecting member 3 is crimped and fixed to the tip of the torch cable 2, and a tightening bolt N can be attached thereto. By tightening the tightening bolt N in a state where the base end 1b of the torch body 1 is connected to the connecting member 3, the connecting member 3 and the torch body 1 can be connected, and a welding operation can be performed. . This tightening bolt N (fastening member) is for fastening the torch body 1 to the connecting member 3 (that is, fastening the torch body 1 and the torch cable 2 via the connecting member 3) or releasing the fastening. It can be tightened with a tool such as a wrench.

Furthermore, the connecting member 3 according to this embodiment is covered with the torch handle 4 for insulation. The torch handle 4 covers the connecting member 3 and can be gripped by a worker during welding, and is formed by, for example, fitting left and right halves of an insulating member (resin member or the like). A cover member 5 is attached at a position adjacent to the torch handle 4 (on the rear end side), and the torch cable 2 is partially covered by the cover member 5 .

As shown in FIG. 2, the torch handle 4 according to this embodiment is formed with an opening 4a through which the tightening bolt N (fastening member) is exposed. The opening 4a is shaped and dimensioned such that the tightening bolt N (in particular, the head into which a tool such as a wrench is inserted) can be visually recognized from the outside and the tightening bolt N can be taken out. By inserting a tool such as a wrench into the opening 4a and loosening the tightening bolt N, the torch body 1 can be removed from the connecting member 3. 1 can be connected. Note that, instead of the tightening bolt N, another general-purpose fastening member that can be tightened with a tool or the like may be used.

A lid member 6 is attached to the opening 4a. The lid member 6 is made of an insulating material that can be attached to and detached from the opening 4a, and is configured to cover the tightening bolt N (fastening member) while attached to the opening 4a. As a result, it is possible to prevent a worker from accidentally inserting a finger, a tool, or the like into the opening 4a when performing a welding operation while gripping the torch handle 4, and it is possible to insulate the opening 4a. can.

That is, by covering the connecting member 3, which is not covered with an insulating coating, with the torch handle 4, it is possible to protect the insulation of this portion. By attaching the lid member 6 to the opening 4a, the tightening bolt N can be insulated. After the welding operation is completed, the lid member 6 is removed, so that a tool such as a wrench can be inserted through the opening 4a to loosen the tightening bolt N. As shown in FIG.

Here, as shown in FIGS. 4 to 8, the lid member 6 according to the present embodiment includes a fitting portion 6a that can be fitted into the opening portion 4a, and a head portion 6b that protrudes laterally from the fitting portion 6a. , and the insertion portion 6a and the head portion 6b are integrally formed of an electrically insulating rubber material (or resin material). A state in which the lid member 6 is attached to the opening 4a is shown in FIG.

More specifically, as shown in FIGS. 6 and 8, the fitting portion 6a has a shape and dimensions that follow the opening shape of the opening 4a, and when the cover member 6 is attached to the opening 4a, It can be inserted and fitted into the opening 4a. In addition, the insertion portion 6a according to the present embodiment has an outer contour dimension set slightly larger than an inner circumference contour dimension of the opening 4a. is configured to be press-fitted against the inner peripheral wall of the

The head portion 6b is composed of a flange integrally extending laterally from one end of the fitting portion 6a, and as shown in FIGS. , to cover the inner peripheral edge of the opening 4a. As a result, even if a gap occurs between the outer peripheral surface of the fitting portion 6a and the inner peripheral surface of the opening portion 4a, the gap can be covered with the head portion 6b. The lid member 6 can be easily removed from the opening 4a by pinching it with fingers.

Therefore, according to the present embodiment, the cover member 6 has the fitting portion 6a that can be fitted into the opening 4a and the head portion 6b that protrudes laterally from the fitting portion 6a. Intrusion of metal powder can be prevented with the cover member 6 attached to the opening 4a, and the cover member 6 can be easily removed from the opening 4a. In addition, since the cover member 6 is made of a rubber material or a resin material having an electrical insulating property in which the insertion portion 6a and the head portion 6b are integrally formed, insulation can be reliably achieved, and the cover member 6 with respect to the opening portion 4a can be secured. can be installed and removed smoothly.

Furthermore, as shown in FIG. 8, the opening 4a according to the present embodiment has a protrusion 4b integrally formed along the edge of the opening, and the lid member 6 is attached to the opening 4a. The rear surface of the portion 6b can come into contact with the tip surface 4ba of the convex portion 4b. As a result, the cover member 6 can be stably attached to the opening 4a, so that it is possible to more reliably prevent metal powder from entering, and the cover member 6 can be removed smoothly from the opening 4a.

Although the present embodiment has been described above, the present invention is not limited to this. For example, as shown in FIG. It may have ba. In this case, the fitting portion 6'a and the head portion 6'b are integrally formed, and the head portion 6'b is folded along the outer peripheral edge 4bb of the convex portion 4b. The lid member 6' can be attached more firmly, and the intrusion of metal powder can be more reliably prevented.

Further, instead of the lid member 6, for example, as shown in FIGS. 10 and 11, a lid member 6'' having a circular head portion 6''b in plan view may be used. In this case, the fitting portion 6''a and the head portion 6''b are integrally formed, and the fitting portion 6''a fits into the opening 4a while the circular head portion 6''b protrudes laterally. Become. The head 6''b may be replaced by a head of another shape (rectangular or irregular in plan view).

It has a fitting part that can be fitted into the opening and is press-fitted against the inner peripheral wall of the opening, and a head that is formed by a flange part that protrudes laterally from the fitting part, and the fitting part and the head. The opening is integrally formed with an electrically insulating rubber or resin material, and the opening has a convex portion integrally formed along the edge of the opening, and a lid member is attached to the opening. If it is a welding torch that covers the entire inner peripheral edge of the opening by contacting the back surface of the head with the tip surface of the convex part in the state, it can be applied to those with different external shapes or other functions added. can do.

1 torch body 1a tip 1b base end 2 torch cable 2a tip 3 connecting member 4 torch handle 4a opening 4b projection 4ba tip surface 4bb outer peripheral edge 5 cover member 6 lid member 6a fitting portion 6b head N tightening bolt (fastening member)

Claims (2)

A torch body that generates an arc at the tip,
a torch cable for powering the torch body;
a metallic connecting member fixed to the distal end of the torch cable for connecting the torch cable and the proximal end of the torch body;
a fastening member for fastening or unfastening the torch body to the connecting member;
a torch handle that covers the connecting member and can be gripped by an operator;
an opening formed in the torch handle and exposing the fastening member to the outside;
a lid member made of an insulating material that can be attached to and detached from the opening and capable of covering the fastening member while attached to the opening;
In a welding torch equipped with
The lid member is
a fitting portion that can be fitted into the opening and is press-fitted into the inner peripheral wall of the opening ;
a head composed of a collar formed to protrude laterally from the fitting;
and is made of an electrically insulating rubber or resin material in which the insertion portion and the head are integrally formed, and the opening is integrally formed with a convex portion along the opening edge and a welding torch characterized in that, in a state in which the lid member is attached to the opening, the rear surface of the head is in contact with the tip end surface of the protrusion to cover the entire inner peripheral edge of the opening . 2. The welding torch according to claim 1 , wherein said head has a bent portion that is bent along an outer peripheral edge of said projection.

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