Parts in place torch structure

• US 4,940,877 A
• Filed: 09/15/1989
• Issued: 07/10/1990
• Est. Priority Date: 09/15/1989
• Status: Expired due to Fees

• Current Assignee: Clore Automotive, LLC (C3 Holdings LLC)
• Original Assignee: Century Manufacturing Co. (Pentair Plc (Ireland))
• Inventors: Broberg, Daniel M.
• Primary Examiner(s): PASCHALL, MARK H
• Application Number:
  US07/407,873
• Time in Patent Office: 298 Days
• Field of Search: 219/121.48, 219/121.5, 219/121.51, 219/121.52, 219/121.54, 219/75, 313/231.21-231.41
• US Class Current: 219/121.5
• CPC Class Codes: H05H 1/34 Details, e.g. electrodes, nozzles
• CPC Class Codes: H05H 1/3468 Vortex generators
• CPC Class Codes: H05H 1/3473 Safety means

Abstract

A plasma arc cutting torch embodying an electrode having a swirl tube and a nozzle thereabout, a spring mechanism bearing on the swirl tube and nozzle being caused by them to complete a circuit, the circuit not becoming completed in the absence of one of or both the swirl tube and nozzle.

Claims

1. A plasma torch, comprising

a torch housing,

a pair of electrical contacts in said housing in different planes, said contacts being included in an operating circuit,

an electrode supported in said housing,

a nozzle in operative association with the lower portion of said electrode,

nozzle supported means forming an upward extension thereof,

resilient means, disposed between said last mentioned means and said contacts, being of such a length as to require being urged by said last mentioned means to the extent of becoming deformed to engage both of said contacts,

whereby in the absence of said nozzle supported means or said nozzle, said resilient means does not engage said contacts, thus making said torch inoperative.

2. The structure of claim 1, wherein

said resilient means is formed as a coil spring.

3. The structure of claim 1, wherein

said contacts are included in the actuating circuit in said torch housing,

4. The structure of claim 1, wherein

said nozzle includes a nozzle cap.

5. The structure of claim 1, wherein

said resilient means is adapted to engage one of said contacts, and

said last mentioned means in operating position urges said resilient means to deform to engage the second of said contacts.

6. A plasma torch, comprising

a torch housing,

means secured in said housing having a pair of electrical contacts in different planes, said contacts being included in an operating circuit,

a tubular member depending from said means,

means disposed within said tubular member having an electrode depending therefrom,

a swirl tube about the lower portion of said tubular member and said electrode,

a nozzle operatively associated with said tubular member and supporting said swirl tube, and

a coil spring supported by said swirl tube, said coil spring being of such a length as to require said support to engage said contacts and in the absence of said swirl tube or said nozzle, said contacts are not engaged and said torch is inoperative.

7. The structure of claim 6, wherein

said nozzle includes a nozzle cap.

8. A plasma torch, comprising

a torch housing,

a plunger housing having a head portion secured in said housing,

a pair of electrical contacts in said head portion in different planes, said contacts being included in an operative circuit,

a pair of concentric tubular members depending from said head portion,

a plunger disposed in the inner of said tubular members having an electrode depending therefrom,

a nozzle in operative association with said electrode,

a swirl tube about said tubular member supported by said nozzle,

a coil spring supported by said swirl tube,

said coil spring being of such a length as to require its uppermost coil to become sufficiently deformed to engage both of said contacts,

whereby in the absence of said support of said nozzle or said swirl tube, said uppermost coil would not engage both of said contacts, thus causing said torch to be inoperative.

9. The structure of claim 8, wherein said plunger is a fixed conducting means to the electrode.