PLASMA TORCH

WIPO Patent Application WO/1998/034441

A1

A plasma torch which enables the improvement of the reliability of electrical connections between a torch main part and a cartridge side electrode and between a torch main part and a torch nozzle. In addition to a female screw part (69) which is formed on the small diameter part of a socket part (67), fin-shaped flat springs (71) made of conductive material such as metal are provided on the inner circumference of the large diameter part of the socket part (67). When the cartridge is coupled with the torch main part (55), the female screw part (69) is screwed with the male screw part of a body to form a 1st current path through which a power from an external power supply is supplied to the electrode of the cartridge. When the cartridge is coupled with the torch main part (55), the flat springs (71) are contracted and brought into contact with the plug part of the cartridge while they hold the outer circumference of the plug part to form 2nd current paths through which a power from the external power supply is supplied to the electrode. A spring washer is provided on the tip side surface of the radial inward flange (61a) of a feeding sleeve (61) or the radial outward flange of a nozzle. Even if the radial outward flange and the radial inward flange (61a) are separated from each other, the electrical contact between both the flanges can be kept through both the tip parts by the action of the spring washer.

SHINTANI TOSHIYA (JP)
NIIGAKI YOSHITAKA (JP)

PCT/JP1998/000341

August 06, 1998

January 28, 1998

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KOMATSU MFG CO LTD (JP)
SHINTANI TOSHIYA (JP)
NIIGAKI YOSHITAKA (JP)

H05H1/34; (IPC1-7): H05H1/34; B23K10/00

JPH01118374A	1989-05-10
JPH0670971U	1994-10-04

Kamimura, Teruyuki (Kotobashi 1-chome Sumida-ku, Tokyo 130, JP)

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