EP0973362A1 - Sicherheitsvorrichtung für Plasmabrenner - Google Patents

Sicherheitsvorrichtung für Plasmabrenner Download PDF

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Publication number
EP0973362A1
EP0973362A1 EP99401701A EP99401701A EP0973362A1 EP 0973362 A1 EP0973362 A1 EP 0973362A1 EP 99401701 A EP99401701 A EP 99401701A EP 99401701 A EP99401701 A EP 99401701A EP 0973362 A1 EP0973362 A1 EP 0973362A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
torch
cap
protective cap
head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99401701A
Other languages
English (en)
French (fr)
Other versions
EP0973362B1 (de
Inventor
Gérard Marhic
Yannick Lepeule
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lincoln Electric Co France SA
Original Assignee
La Soudure Autogene Francaise
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by La Soudure Autogene Francaise filed Critical La Soudure Autogene Francaise
Publication of EP0973362A1 publication Critical patent/EP0973362A1/de
Application granted granted Critical
Publication of EP0973362B1 publication Critical patent/EP0973362B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3473—Safety means

Definitions

  • the present invention relates to a device for safety for electric arc work torch, especially for plasma cutting torch.
  • the electrode of a cutting torch plasma is carried, during use, at high voltages, commonly above 100 V, and sometimes up to 300 V.
  • the electrode is normally made inaccessible to the operator by the presence of the nozzle of the torch coming position around the electrode in a manner known in oneself.
  • the electrode is then cleared, that is to say accessible to the operator.
  • the document EP-A-110736 proposes a system of security based on presence control only an insulating protective skirt arranged around the torch nozzle.
  • this system does not support counts the presence of the nozzle and a distracted operator could reassemble this protective skirt by omitting replace the nozzle, which would allow access to the electrode by the operator and therefore would be susceptible to expose it to a significant risk of electric shock by contact with live parts, in particular the electrode.
  • document DE-A-3714995 describes a torch plasma equipped with a nozzle around which is arranged a protective cap and comprising a system safety device including an electric switch be actuated by a movable shaped push rod which is located in a dwelling located inside the torch body.
  • the push rod cooperates with the nozzle through a movable annular part.
  • the cap of protection is mounted on the torch body.
  • the aim of the present invention is therefore to solve the aforementioned problem by proposing a security system for electric arc work torches, especially for manual plasma cutting torch, allowing check for simultaneous presence, i.e. mounting correct, not only from the nozzle surrounding the electrode of the torch, but also of the protective skirt insulator surrounding said nozzle.
  • the present invention aims to improve known plasma torches.
  • the security system according to the invention must be easy to manufacture and inexpensive industrially acceptable.
  • the torch according to the invention can be used in any manual welding process or manual arc cutting plasma.
  • Figures 1 to 4 show diagrams, in section longitudinal and in side and partial view of a manual plasma cutting torch 1 according to a first mode of production in accordance with the present invention, comprising a torch head 1 'carrying a nozzle holder 10 and a nozzle 4, said nozzle 4 being fixed to the door nozzle 10 by means of fixing means 14, such as, for example, threading, tapping or the like.
  • the plasma torch 1 has a handle 2, partially shown here, within which are arranged electrical switch means 3 comprising a control member 9 for controlling supply and / or interruption of supply to said torch head 1 'in electric current.
  • a removable protective cap 5 preferably an insulating material, such as a polymer, is placed axially around at least part of the head torch 1 ', that is to say that this protective cap 5 surrounds part of the nozzle holder 10 and the nozzle 4 like a sleeve.
  • the cap 5 of protection consists of three parts 8, 13 and 23 likely to cooperate with all or part of elements making up the torch head 1 ′, preferably with the nozzle 4, to allow fixing and holding said protective cap 5 on said head torch 1 '.
  • the three parts 8, 13 and 23, playing the role of holding means include a rod 8, a fixed part 23 and a movable part 13 whose function is to compress the rod 8 by sliding along the substantially conical internal surface of the movable part 13 and / or the fixed part 23.
  • the rod 8 comes to cooperate with a recess 7 peripheral, like a circular groove, arranged in periphery of the upper part 12 of the nozzle 4, said rod 8 penetrating at least partially into said peripheral groove 7 when the cap 5 on the nozzle 4.
  • the nozzle 4 is positioned and fixed to the nozzle holder 10 by means of attachment 14, such as thread and internal thread, or all analogous means.
  • Correct positioning of the nozzle 4 in the nozzle holder 10 is obtained, for example, when the upper bearing surface 12 of the nozzle 4 comes in stop against the lower bearing surface 11 of the door nozzle 5, as shown in FIG. 1, where one sees that the nozzle 4 and the nozzle holder 5 are coaxial along the axis (x-x ').
  • the rod 8 located inside the protective cap 5 is located after correct positioning of the protective cap 5 on the torch head 1 ', opposite the groove 7 arranged in periphery of the nozzle and then it suffices, by a means suitable, such as a cone or the like, for tightening the rod 8 to force it to partially penetrate the groove 7 of the nozzle 4, so as to secure, in working position, the two parts, namely the nozzle 4 and the protective cap 5.
  • the extension or medium actuation of the cap 5 comes to cooperate with the control member 9 for the switching means electric to authorize the operation of the source power, i.e. the current generator or analogous, thereby contributing to the feeding of the head torch 1 'in electric current.
  • the means actuation or extension 6 of the cap 5 can enter the internal space of the handle 2 of the torch 1 and thus activate the electric switch 3, in this configuration, the protective cap 5 does not cannot hold in place and is automatically ejected as soon as the operator releases it, since the nozzle 4 being absent, the protective cover 5 cannot be held on the end of the torch head 1 '.
  • the device according to the present invention has an important advantage from the point of view security, insofar as the functioning of the power generator delivering electric current can only be authorized when the nozzle 4 and the protective cap 5, at a time, are properly placed on the head 1 'of the torch.
  • Figures 5 to 8 show diagrams of a second embodiment of a torch 1 manual plasma cutting in accordance with this invention; this second embodiment being prefer.
  • the torch head 1 ′ comprises a holder nozzle 10 and a nozzle 4 fixed to the nozzle holder 10 by by means of fixing means 14, for example a threading, tapping or the like.
  • the electrical switch means 3 provided with a control member 9 for controlling supply and / or interruption of supply to the torch head 1 'in electric current are arranged in the handle 2 of the plasma torch 1.
  • the cap is formed of a single piece and not of several mobile sub-parts serving as means holding as in the first embodiment.
  • the cap for example made of polymer material hung on a metal ring, consists of a unique structure carrying the rod 8 permanently inserted in a recess or a groove arranged on its wall internal device.
  • the rod 8 penetrates at least partially in the peripheral groove 7 of the nozzle 4, during fitting by clipping of the cover 5 on said nozzle 4, said rod 8 coming to be inserted in the circular groove 7.
  • the internal diameter of the rod 8 is substantially equal or slightly lower the external diameter of the nozzle 4 measured in or at the bottom circular groove 7.
  • the internal diameter of the rod 8 can be about 17mm and the outside diameter of the nozzle 4 measured at the bottom of the circular groove 7 can be a few tenths of a millimeter lower.
  • the protective cap 5 carries a ring 15 metallic integral with part of its internal wall, said ring 15 being associated with said ring 8, so as to allow better thermal and mechanical resistance of this part of the skirt.
  • the actuation means 6 formed of an axial extension of the cap 5 comes to cooperate with the control member 9 for the switching means electric to allow the supply of the head 1 ' in electric current. If nozzle 4 is omitted, the risks of electric shock for the operator are greatly diminished because, as explained above, the protective cap 5 cannot hold in place and is automatically ejected as soon as the operator releases it and the torch head 1 'cannot be supplied with electric current continuously.
  • the head 1 ' torch cannot be supplied with current electric because the actuating means 6, that is to say the axial extension of the cap 5, cannot come cooperate with the means control member 9 electrical switches to allow power from the head 1 'while running.
  • said cap protection 5 has a first support face comprising at least a first ramp, preferably two ramps 16 and 16 '.
  • the first ramps 16, 16 'of the protective cap 5 are worn by the axial extension 6 of the peripheral wall of the cap 5 and constitute the bearing faces of this axial extension 6.
  • the end of the torch head 1 ' has a second bearing face comprising at least a second ramp, preferably two ramps 14 and 14 '.
  • the ramps 16 and 16 ' have a shape, i.e. slopes, approximately equal or substantially complementary to that of ramps 14 and 14 ', respectively.
  • the ramp 14 may have a slope equal to or different from that of ramp 14 'and, from similarly, the ramp 16 can be of equal slope or different from that of the 16 'ramp.
  • the present invention improves significantly the safety of using a torch plasma, in particular manual, which is equipped with it.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Discharge Heating (AREA)
EP99401701A 1998-07-15 1999-07-07 Sicherheitsvorrichtung für Plasmabrenner Expired - Lifetime EP0973362B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9809038A FR2781328B1 (fr) 1998-07-15 1998-07-15 Dispositif de securite pour torche a plasma
FR9809038 1998-07-15
CA002281394A CA2281394A1 (en) 1998-07-15 1999-09-02 Safety device for a plasma torch

Publications (2)

Publication Number Publication Date
EP0973362A1 true EP0973362A1 (de) 2000-01-19
EP0973362B1 EP0973362B1 (de) 2004-09-22

Family

ID=25681183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99401701A Expired - Lifetime EP0973362B1 (de) 1998-07-15 1999-07-07 Sicherheitsvorrichtung für Plasmabrenner

Country Status (7)

Country Link
US (1) US6096993A (de)
EP (1) EP0973362B1 (de)
AT (1) ATE277496T1 (de)
CA (1) CA2281394A1 (de)
DE (1) DE69920343T2 (de)
ES (1) ES2229644T3 (de)
FR (1) FR2781328B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110169207A (zh) * 2017-01-13 2019-08-23 海别得公司 禁用等离子弧焊枪及相关系统和方法

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6914211B2 (en) * 2003-02-27 2005-07-05 Thermal Dynamics Corporation Vented shield system for a plasma arc torch
US6881921B2 (en) * 2003-05-22 2005-04-19 Thermal Dynamics Corporation Torch with rotational start
AT502423B1 (de) * 2005-09-09 2007-06-15 Fronius Int Gmbh Vorrichtung zum wechsel einer düse eines wasserdampfplasmabrenners
US20070138150A1 (en) * 2005-12-20 2007-06-21 Honeywell International, Inc. Hand-held laser welding wand position determination system and method
US10098217B2 (en) 2012-07-19 2018-10-09 Hypertherm, Inc. Composite consumables for a plasma arc torch
US10194516B2 (en) 2006-09-13 2019-01-29 Hypertherm, Inc. High access consumables for a plasma arc cutting system
US7989727B2 (en) * 2006-09-13 2011-08-02 Hypertherm, Inc. High visibility plasma arc torch
US9560732B2 (en) 2006-09-13 2017-01-31 Hypertherm, Inc. High access consumables for a plasma arc cutting system
US9662747B2 (en) 2006-09-13 2017-05-30 Hypertherm, Inc. Composite consumables for a plasma arc torch
DE102009048397A1 (de) * 2009-10-06 2011-04-07 Plasmatreat Gmbh Atmosphärendruckplasmaverfahren zur Herstellung oberflächenmodifizierter Partikel und von Beschichtungen
CN205021001U (zh) * 2013-04-09 2016-02-10 松下知识产权经营株式会社 等离子切割用割炬
US9609733B2 (en) 2013-11-12 2017-03-28 The Esab Group, Inc. Plasma arc torch and method for assembling and disassembling a plasma arc torch
US11432393B2 (en) 2013-11-13 2022-08-30 Hypertherm, Inc. Cost effective cartridge for a plasma arc torch
US9981335B2 (en) 2013-11-13 2018-05-29 Hypertherm, Inc. Consumable cartridge for a plasma arc cutting system
US11684995B2 (en) 2013-11-13 2023-06-27 Hypertherm, Inc. Cost effective cartridge for a plasma arc torch
US11278983B2 (en) 2013-11-13 2022-03-22 Hypertherm, Inc. Consumable cartridge for a plasma arc cutting system
US10456855B2 (en) 2013-11-13 2019-10-29 Hypertherm, Inc. Consumable cartridge for a plasma arc cutting system
RU2693233C2 (ru) * 2014-08-12 2019-07-01 Гипертерм, Инк. Затратоэффективная головка для плазменно-дуговой горелки
CN108141948B (zh) 2015-08-04 2021-08-10 海别得公司 用于液体冷却的等离子弧焊炬的筒
US10413991B2 (en) 2015-12-29 2019-09-17 Hypertherm, Inc. Supplying pressurized gas to plasma arc torch consumables and related systems and methods
US9831070B1 (en) 2017-06-15 2017-11-28 Enercon Industries Corporation Surface treater with expansion electrode arrangement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534107A1 (fr) * 1982-10-01 1984-04-06 Soudure Autogene Francaise Torche de travail a l'arc munie d'une coiffe amovible
GB2192821A (en) * 1986-06-27 1988-01-27 Wtc Holdings Limited Air plasma arc torch
DE3714995A1 (de) * 1987-05-06 1988-11-17 Wilhelm Dinse Vorrichtung zum plasmaschneiden und -schweissen von metallischen werkstuecken
JPS6457982A (en) * 1987-08-28 1989-03-06 Hitachi Seiko Kk Plasma torch
DE4313830A1 (de) * 1993-04-28 1994-11-03 Binzel Alexander Gmbh Co Kg Lichtbogenschweiß- oder -schneidbrenner

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1191365B (it) * 1986-06-26 1988-03-16 Cebora Spa Circuito di comando per una apparecchiatura di talgio o saldatura al plasma ad arco trasferito
US4973816A (en) * 1989-03-28 1990-11-27 Delaware Capital Formation, Inc. Plasma torch with safety switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534107A1 (fr) * 1982-10-01 1984-04-06 Soudure Autogene Francaise Torche de travail a l'arc munie d'une coiffe amovible
GB2192821A (en) * 1986-06-27 1988-01-27 Wtc Holdings Limited Air plasma arc torch
DE3714995A1 (de) * 1987-05-06 1988-11-17 Wilhelm Dinse Vorrichtung zum plasmaschneiden und -schweissen von metallischen werkstuecken
JPS6457982A (en) * 1987-08-28 1989-03-06 Hitachi Seiko Kk Plasma torch
DE4313830A1 (de) * 1993-04-28 1994-11-03 Binzel Alexander Gmbh Co Kg Lichtbogenschweiß- oder -schneidbrenner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 252 (M - 836) 12 June 1989 (1989-06-12) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110169207A (zh) * 2017-01-13 2019-08-23 海别得公司 禁用等离子弧焊枪及相关系统和方法

Also Published As

Publication number Publication date
ES2229644T3 (es) 2005-04-16
FR2781328A1 (fr) 2000-01-21
ATE277496T1 (de) 2004-10-15
FR2781328B1 (fr) 2000-08-18
CA2281394A1 (en) 2001-03-02
DE69920343T2 (de) 2005-11-17
US6096993A (en) 2000-08-01
EP0973362B1 (de) 2004-09-22
DE69920343D1 (de) 2004-10-28

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