Contact start plasma arc torch and method of initiating a pilot arc
First Claim
1. A plasma arc torch comprising:
- an electrode;
a tip; and
an initiator in electrical contact with the electrode and in contact with the tip, the initiator being movable to separate from the tip and establish a pilot arc between the initiator and the tip.
11 Assignments
0 Petitions
Accused Products
Abstract
A contact start plasma arc torch is provided that comprises an electrode, a tip, and an initiator that is resiliently biased into contact with the tip, the initiator being movable against the resilient bias to separate from the tip and establish a pilot arc between the initiator and the tip. The initiator is disposed within a start cartridge, which preferably comprises a coil spring that biases the initiator into contact with the tip. The plasma arc torch further comprises a plurality of head vent holes to vent gas from within the start cartridge during operation of the torch. Additionally, the tip defines a plurality of swirl holes and secondary gas holes to generate and control a plasma stream that is subsequently blown from a central exit orifice in the tip.
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Citations
99 Claims
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1. A plasma arc torch comprising:
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an electrode;
a tip; and
an initiator in electrical contact with the electrode and in contact with the tip, the initiator being movable to separate from the tip and establish a pilot arc between the initiator and the tip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A plasma arc torch comprising:
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an electrode;
a tip; and
a start cartridge disposed between the electrode and the tip, the start cartridge further comprising;
a cartridge assembly;
a biasing member disposed within the cartridge assembly; and
an initiator disposed within the cartridge assembly, the initiator being resiliently biased into contact with the tip by the biasing member, the initiator being movable against the resilient bias to separate from the tip and establish a pilot arc between the initiator and the tip. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A start cartridge for use in initiating a pilot arc in a plasma arc torch comprising:
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a cartridge assembly;
a biasing member disposed within the cartridge assembly; and
an initiator disposed within the cartridge assembly, the initiator being resiliently biased such that the initiator is movable against the resilient bias to establish a pilot arc between the initiator and a tip within the plasma arc torch. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A start cartridge for use in initiating a pilot arc in a plasma arc torch comprising:
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a cartridge body;
a tip seat secured to a distal portion of the cartridge body;
a biasing member disposed within the cartridge body; and
an initiator disposed within the cartridge body, the initiator being resiliently biased such that the initiator is movable against the resilient bias to establish a pilot arc between the initiator and a tip within the plasma arc torch. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A start cartridge for use in initiating a pilot arc in a plasma arc torch comprising:
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a cartridge assembly; and
an initiator disposed within the cartridge assembly, the initiator being resiliently biased such that the initiator is movable against the resilient bias to establish a pilot arc between the initiator and a tip within the plasma arc torch. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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- 70. An initiator for initiating a pilot arc in a plasma arc torch, the initiator being movable against a resilient bias to establish a pilot arc between the initiator and a tip within the plasma arc torch.
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75. An initiator for initiating a pilot arc in a plasma arc torch, the initiator being movable against a resilient bias to establish a pilot arc between the initiator and a tip within the plasma arc torch, the initiator comprising:
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a proximal face;
a recessed proximal face;
an annular wall formed between the proximal face and the recessed proximal face; and
a plurality of vent holes are formed through the annular wall, wherein the vent holes vent a working gas from the initiator.
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76. A plasma arc torch head for use with a fixed electrode, a fixed tip, and a source of gas and electric power for initiating a pilot arc comprising:
head vent holes disposed at a proximal section of the torch head, wherein the vent holes vent at least a portion of the gas from the torch head. - View Dependent Claims (77)
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78. A plasma arc torch comprising:
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a torch head comprising;
a housing;
a cathode disposed within the housing and connected to a supply of gas and electric power;
an anode disposed within the housing and connected to the supply of gas and electric power;
an insulating body disposed between the cathode and the anode;
an electrode removably engaged with the cathode;
a tip in a spaced relationship with the electrode;
a shield cup removably engaged with the anode; and
an initiator resiliently biased into contact with the tip, the initiator being movable against the resilient bias to separate from the tip and establish a pilot arc between the initiator and the tip. - View Dependent Claims (79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92)
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93. A plasma arc torch comprising:
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an electrode;
a tip; and
a start cartridge disposed between the electrode and the tip, the start cartridge further comprising;
a cartridge body;
a tip seat secured to a distal portion of the cartridge body;
a biasing member disposed within the cartridge body; and
an initiator disposed within the cartridge body, the initiator being resiliently biased into contact with the tip by the biasing member, the initiator being movable against the resilient bias to separate from the tip and establish a pilot arc between the initiator and the tip.
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94. A method of initiating a pilot arc in a plasma arc torch, the method comprising the steps of:
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biasing an initiator into contact with a tip;
providing a source of gas and electric power; and
directing at least a portion of the gas to overcome the bias to separate the initiator from the tip, wherein the pilot arc is drawn between the initiator and the tip as the bias is overcame. - View Dependent Claims (95, 96)
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97. A method of venting gas from a plasma arc torch comprising a fixed electrode and a fixed tip, the method comprising the steps of:
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providing a source of gas and electric power;
directing the gas and electric power to initiate a pilot arc; and
venting at least a portion of the gas through head vent holes. - View Dependent Claims (98)
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99. A method of initiating a pilot arc in a plasma arc torch, the method comprising the steps of:
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providing a source of gas to move an initiator into contact with a tip;
providing a source of electric power; and
moving the initiator away from contact with the tip to draw an arc between the initiator and the tip.
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Specification