JPS628935Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a gun arm device for a portable resistance welding gun.

Conventionally, this type of device has a gun arm body that has an electrode holder at the tip and a support member at the tail end.
A type equipped with a conductor for connecting the holder to a secondary conductor terminal at the rear thereof and a water passage for cooling is known;
- As seen in Publication No. 24455, the main body is formed into a cylindrical body made of bent plate material, and a copper pipe is arranged inside the body so that the pipe serves both as a conductor and as a water passage. It is also known that
In such a device, it is difficult to obtain sufficient strength for the main body, it is difficult to obtain sufficient current capacity for the pipe, and furthermore, the structure as a whole is complicated and requires time and effort to manufacture.

The purpose of the present invention is to obtain a device free of such inconveniences, and includes a gun arm body 3 having an electrode holder 1 at the tip and a support member 2 at the tail end.
In a type comprising a conductor 5 for connecting the holder 1 to the secondary conductor terminal 4 at the rear thereof and a water passage 6 for cooling, the water passage 6 is constituted by a copper pipe 6a extending in the front-rear direction. The main body 3 and the conductor 5 are composed of plate-like bodies that are overlapped and bonded to both sides thereof.

In the illustrated example, there are two copper pipes 6a, one on the inflow side and one on the outflow side, upper and lower, and the above-mentioned plate-like bodies 3 and 5 are superimposed on both sides and bonded together by welding or other means. In general, the main body 3 is made of magnetic carbon steel, for example, and the conductor 5 is made of a copper alloy with high electrical conductivity.

In this way, according to the present invention, the main body 3 made of plate-shaped bodies and the conductor 5 are bonded together on both sides of the copper pipe 6a constituting the water passage 6.
The main body 3 is reinforced with the copper pipe 6a and the conductor 5, and has a relatively large strength as a whole, and the conductor 5 cooperates with the copper pipe 6a to obtain a relatively large current capacity. Overall, the structure is simple and has the advantage of being inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of one example of the device of the present invention, Fig. 2 is a top view thereof, and Fig. 3 is the same as Fig. 1.
FIG. DESCRIPTION OF SYMBOLS 1... Electrode holder, 2... Support member, 3... Gun arm main body, 4... Secondary conductor terminal, 5... Conductor, 6... Water passage, 6a... Copper pipe.

Claims (1)

[Scope of utility model registration request] A gun arm main body 3 having an electrode holder 1 at the tip and a support member 2 at the tail end, a conductor 5 connecting the holder 1 to a secondary conductor terminal 4 at the rear thereof, and a water passage 6 for cooling. In the resistor, the water passage 6 is constituted by a copper pipe 6a extending in the front-rear direction, and the body 3 and the conductor 5 are constituted by plate-like bodies overlapped and bonded to both sides thereof. Gun arm device for welding gun.