Welding torch with a contact socket and a feed device

Details Welding torch with a contact socket and a feed device Welding torch with a contact socket and a feed device

1998-10-30

2001-03-13

Kastler, Scott (Department: 1742)

Metallurgical apparatus

Means for cutting solid metal with heat, e.g., blowpipes

Hand held, work riding torch

C219S136000

Reexamination Certificate

active

06200519

ABSTRACT:

The invention relates to a welding torch with a contact socket and a feed device.
Many different types of welding torches with contact sockets are known, in connection with which forced contacting of the welding wire with the contact socket is achieved through a special design of the contact socket. According to DE 44 10 370 A1, for example, forced contacting of the welding wire with the contact socket is known, where the contact socket has a recess extending over part of its length, and a contact element adapted to the recess is inserted in the latter. The contact element is pressed against the welding wire via spring tension, so that forced contact of the contact element with the welding wire takes place. The drawback in this connection is that high manufacturing expenditure and thus high costs are incurred in the manufacture of the contact socket, and that flawless contacting is not assured when the spring tension is reduced.
The present invention is based on the problem of creating a welding torch with a contact socket and a feed device in connection with which forced contacting of the welding rod with the contact socket takes place, whereby it is possible to employ commercially available contact sockets.
Said problem of the invention is solved with the a welding torch having a centrally extending longitudinal axis and comprising a contact socket defining a longitudinally extending bore having a center axis and a feed device for a welding rod extending to the contact socket. According to this invention, the feed device has a centrally extending longitudinal axis extending parallel to the centrally extending longitudinal axis of the welding torch and is offset therefrom and from the center axis of the contact socket, so that the feed device deflects the welding rod transversely to the contact socket bore, preferably being deformed obliquely relative to the center axis of the contact socket towards the centrally extending longitudinal axis of the welding torch to deflect the welding rod transversely to the contact socket bore. The surprising advantage of this apparently simple solution lies in the fact that a defined area of contact is created in the contact socket by feeding the welding wire to the bore of the contact socket at an angle, so that the welding wire is forced to come into contact with the contact socket. Another unforeseeable advantage lies in the fact that forced contacting of the welding wire with the contact socket is always assured when a welding wire with low dressing and/or spring constant is used.
Providing a transition piece is advantageous because it assures a seamless transition of the welding rod from the feed device into the contact socket.


REFERENCES:
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patent: 4410370 (1995-09-01), None
patent: 2349389 (1997-11-01), None
patent: 2074069 (1981-10-01), None

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