KR20100120562A - Torch handle including torch safety means for use in hand-operated welding torch - Google Patents

Abstract

PURPOSE: A torch handle for a manual welding torch, including a torch safety device for preventing unnecessary operation of the torch, is provided to prevent the feed of welding wire and the emission of protective gas when the torch is not in operation. CONSTITUTION: A torch handle for a manual welding torch comprises a housing, a trigger switch(108), a limit switch(110), a changeover switch(124), a compression ring(114), and a deformed bar(116). The housing accepts a part of a welding cable(18) and a torch head. The trigger switch is pivoted on a part of the housing. The limit switch is operated with the trigger switch. The changeover switch is connected to the limit switch. The compression ring compresses a gas pipe extended inisde the welding cable. The deformed bar connects the welding cable to a torch body(12).

Description

TORCH HANDLE INCLUDING TORCH SAFETY MEANS FOR USE IN HAND-OPERATED WELDING TORCH}

The present invention relates to a manual welding torch, in which a worker performs a welding by feeding a welding wire while activating a trigger switch installed at a lower portion of the torch handle to discharge a protective gas for welding. A torch handle having a switch and a limit switch configured to interlock with each other and having torch safety means for preventing the torch from operating unnecessarily.

In general, gas welding or arc welding is mainly used for welding carbon steel, alloy steel, and colored metal, and supplies current to the wire while supplying a consumable electrode wire serving as a welding rod to a molten weld pool at a constant speed. To generate an arc between the wire and the base metal. The carbon dioxide arc welding is a welding torch to perform welding in a protective gas for welding, such as carbon dioxide, hydrogen, nitrogen, helium, argon.

Welding torch is generally divided into automatic welding torch and manual welding torch. A torch for automatic welding means a torch attached to an automatic welding device that automatically performs a welding operation, and a manual welding torch means that a welding operation is performed by an operator holding the torch handle by hand.

In more detail, the torch for manual welding is described in detail. After a worker grabs the torch handle and approaches the torch head by welding, the welding protective gas filled in the gas cylinder by pressing the torch switch installed on the handle with a finger is a gas nozzle of the torch head. At the same time as blowing through, a wire feeder pushes the electrode wire to feed it to a position adjacent to the substrate. An arc is generated at an end of the electrode wire adjacent to the base material by electricity supplied through the welder, and the base material is welded while the electrode wire is melted.

The torch handle of the conventional manual welding torch is merely a means for the worker to grip and perform welding by hand to perform a welding operation. In more detail, the torch handle of the torch for manual welding includes a release rod for connecting the welding cable to the torch body, a pressing ring for pressing the gas pipe of the welding cable, and a housing for accommodating the release rod and the welding cable.

The welding cable includes an exterior material for protecting the cable from external impact, a control cable for operation control, a conductor through which a welding current flows, that is, a power line, and a gas pipe for feeding a welding protective gas.

In the case of welding by using the torch handle of the manual welding torch, no particular problem occurs in the process of feeding the welding wire and releasing the protective gas for welding. However, during the pre-welding and post-welding work, the torch head for manual welding is left on the site adjacent to the worker so that the worker can use it at any time. In this case, the trigger switch may be operated by a slight physical collision, which may cause unnecessary welding wires to cause poor welding, and often cause a safety accident by releasing welding protective gas into a closed space.

In order to solve this problem, locking / unlocking devices capable of securing the trigger switch to the torch handle are known in the art. The locking / unlocking device includes a switching lever disposed outside the torch handle, a trigger pressing plate extending downward of the switching lever, and a direction switching plate formed under the trigger pressing plate. When the lock / unlock device is in the locked state, the trigger switch does not operate by an external shock, thereby preventing a safety accident.

However, since the above-described locking / unlocking device is configured to prevent only the operation of the trigger switch, there is a disadvantage in that the operation of the limit switch cannot be prevented.

In addition, the lock / unlock device is made of metal, while the torch handle supporting the lock / unlock device is made of plastic. Therefore, if the lock / unlock device is repeatedly driven, the portion of the torch handle supporting the lock / unlock device is worn, and there is play between the trigger switch and the lock / unlock device, so that the trigger switch cannot be securely locked. There is also.

Therefore, the present invention is to solve the problems of the conventional torch torch handle of the conventional manual welding torch, when the welding operation is not performed, the welding wire is supplied by the external impact and the welding protective gas is released. It is an object of the present invention to provide a torch handle having a torch safety means which can reliably prevent the damage.

It is a further object of the present invention to provide a torch handle having a torch safety means configured to interlock a limit switch and a changeover switch.

In order to achieve the above and other objects of the present invention, according to one embodiment of the present invention, in the torch handle of the torch for manual welding disposed between the torch head and the welding cable, to accommodate a part of the torch head and the welding cable A torch handle is provided that includes a housing, a trigger switch having one end rotatably provided in a part of the housing, a limit switch driven by the trigger switch, and a switching switch connected to the limit switch.

A compression ring for pressing the gas pipe extending from the inside of the welding cable, and a release rod for connecting the welding cable to the torch body.

The changeover switch has a changeover lever protruding out of the housing, the changeover lever being selectively set between a locked position and an unlocked position.

The limit switch is in contact with the trigger switch and has a push-pull switch that is turned on / off by driving the trigger switch.

One of the terminals of the limit switch is connected with one of the terminals of the changeover switch, the other terminal is connected with the controller, and the other terminal of the changeover switch is connected with the controller.

According to still another embodiment of the present invention, in the torch handle of a manual welding torch disposed between the torch head and the welding cable, a housing for accommodating a portion of the torch head and the welding cable, and one end thereof rotates to a portion of the housing. A trigger switch provided to be possible, a sliding lever slidably provided on an outer surface of the housing, and a locking block installed inside the housing and coupled to the sliding lever, wherein the locking block is coupled to a part of the trigger switch. And a torch handle having a locking member for limiting the drive of the trigger switch.

According to the above configuration, when the operator sets the switching lever to the locked position, the welder does not operate even if an external force is applied to the trigger switch. Therefore, the welding wire is fed and the protective gas for welding such as carbon dioxide is prevented from being released, which not only protects the worker but also improves safety.

In particular, since the welding wire is not fed unnecessarily, unnecessary waste of the welding wire can be reduced. In addition, it is possible to contribute to preventing global warming by suppressing the emission of carbon dioxide which is mainly used as a protective gas for welding.

Hereinafter, a torch handle of a manual welding torch according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view schematically showing a torch handle of a manual welding torch according to a preferred embodiment of the present invention, Figure 2 is an exploded perspective view of the torch handle of the manual welding torch shown in FIG.

The torch handle 10 of the torch for manual welding according to the present invention is disposed between the torch head and the welding cable 18, the torch head being bent at a straight line or at an angle, and the welding protection. It is common to have a gas nozzle 16 for injecting gas into the base material and an insulator 14 for electrically insulating the gas nozzle 16 and the torch body 12.

The torch handle 10 of the present invention has a lower housing 102 and an upper housing 104 fixed by a plurality of screws 132. In the lower housing 102 or the upper housing 104, a trigger switch 108 for driving the torch head, a limit switch 110 driven by the trigger switch, and a switch connected to the limit switch 110. The switch 124 is mounted.

The changeover switch 124 is actuated by a changeover lever 106 protruding out of the upper housing 104 in this embodiment. The switching lever 106 is selectively switchable between the locked position and the unlocked position.

The torch handle 10 also includes a crimping ring 114 for crimping gas pipes (not shown) extending inside the welding cable 18 and a release rod 116 for connecting the welding cable 18 to the torch body 12. In the present embodiment, the pressing ring 114 and the release bar 116 are mounted in corresponding grooves formed in the lower housing 102, respectively. The lower housing 102 has a cable support 122 that projects rearward to support the welding cable 18.

3 is a diagram schematically showing a configuration in which the limit switch 110 and the switching switch 124 are connected by wires.

The push-pull switch of the limit switch 110 is placed in contact with a portion of the trigger switch 108. The trigger switch 108 is inserted into a hinge 138, one end of which protrudes from a portion of the lower housing 102, and is pivotable about the hinge 138. In addition, the other end of the limit switch 110 is elastically supported by the coil spring 134.

According to the above configuration, the trigger switch 108 is always pressed in the direction away from the limit switch 110 by the spring 134, so that the push-pull switch 128 is kept in the OFF state. However, when the trigger switch 108 is pressed by the operator in a direction against the elastic force of the spring 134, the push-pull switch 128 is switched to the ON state, and the limit switch 110 is also turned on.

At this time, one of the terminals 132 of the limit switch 110 is connected to one of the terminals 126 of the changeover switch 124 through the line (L1), the other terminal is connected to the controller through the line (L3) It is. The other terminal of the changeover switch 124 is also connected to the controller via the line L2.

Therefore, when the switching lever 106 is in the locked position, since the switching switch 124 is turned off, even if the limit switch 110 is turned on by the trigger switch 108, the welding start signal is not transmitted to the controller. Do not.

However, when the switching lever 106 is in the unlocked position, since the switching switch 124 is turned on, when the limit switch 110 is turned on by the trigger switch 108, a welding start signal is transmitted to the controller. .

According to the above-described configuration, even if the operator leaves the torch handle around the operator in a state where the switch lever 106 is set to the locked position, the welder does not operate by the operation of the trigger switch 108. Therefore, the welding wire is fed and the protective gas for welding such as carbon dioxide is prevented from being released, which not only protects the worker but also improves safety.

According to a variant of the invention, the torch handle of the torch for manual welding, as shown in Figure 4, the upper housing 204 is provided with a sliding lever 206, the sliding lever 206 is a trigger switch ( It is coupled by the bolt and the fastening portion 210 of the locking block 208 in contact with the 108. Thus, when the sliding lever 206 moves to the locked position or the released position, the locking block 208 also moves to the locked position or the released position.

When the sliding lever 206 moves to the locked position, the locking member 212 of the locking block 208 engages with the top surface of the trigger switch 108 to prevent the trigger switch from operating.

Although the present invention has been described with reference to the above embodiments, the protection scope to be protected is not limited by the above embodiments. The protection scope of the present invention is determined by the following claims.

1 shows schematically a torch handle of a torch for manual welding according to a preferred embodiment of the present invention;

Figure 2 is an exploded perspective view of the torch handle of the torch for manual welding shown in FIG.

3 is a diagram schematically showing a configuration in which a limit switch and a switching switch are connected by a wire;

4 is a view schematically showing a torch handle according to a modification of the present invention, FIG. 4A is a perspective view schematically showing an upper housing provided with a sliding lever, and FIG. 4B is a view schematically showing a locking block and a trigger switch. Perspective view.

<Explanation of symbols for the main parts of the drawings>

10: Torch handle of the torch for manual welding

12: torch body

14: Insulator

16: gas nozzle

18: welding cable

102: housing

106: switching lever

108: trigger switch

110: limit switch

124: changeover switch

Claims (6)

In the torch handle of the torch for manual welding disposed between the torch head and the welding cable, A housing for receiving a portion of the torch head and a welding cable; A trigger switch having one end rotatably provided in a part of the housing; A limit switch driven by the trigger switch; And a changeover switch connected to the limit switch. The method of claim 1, And a release ring for pressing the gas pipe extending inside the welding cable, and a release rod for connecting the welding cable to the torch body. The method according to claim 1 or 2, And the changeover switch has a changeover lever protruding out of the housing, the changeover lever being selectively set between a locked position and an unlocked position. The method of claim 3, wherein And the limit switch is in contact with the trigger switch and has a push-pull switch that is turned on / off by driving the trigger switch. The method of claim 4, wherein One of the terminals of the limit switch is connected to one of the terminals of the changeover switch, the other terminal is connected to the controller, and the other terminal of the changeover switch is connected to the controller. In the torch handle of the torch for manual welding disposed between the torch head and the welding cable, A housing for receiving a portion of the torch head and a welding cable; A trigger switch having one end rotatably provided in a part of the housing; A sliding lever slidably provided on an outer surface of the housing; Is installed inside the housing, and includes a lock block coupled to the sliding lever, And the locking block includes a locking member coupled with a portion of the trigger switch to limit driving of the trigger switch.

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