# US 8,772,668 B2 · Plasma torch and torch handle having ergonomic features

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- Number: US 8,772,668 B2
- Document ID: US8772668B2
- Status: Granted
- Kind: B2
- Application number: 13/213,910
- Filed: 2011-08-19
- Published: 2013-02-21
- Granted: 2014-07-08
- Earliest claimed: 2011-08-19
- Assignees: Illinois Tool Works Inc.
- Applicants: Nathan Gerald Leiteritz; Stefan Giessler; David Paul Marcusen
- Inventors: Nathan Gerald Leiteritz; Stefan Giessler; David Paul Marcusen
- Web page: https://patentgrep.com/patent/US8772668B2

## CPC

- H05H 1/26: Plasma torches
- B23K 9/28: Supporting devices for electrodes
- H05H 1/34: Details, e.g. electrodes, nozzles
- H05H: PLASMA TECHNIQUE (apparatus or processes specially adapted for producing X-rays H05G2/00); PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

A plasma torch having a torch handle is provided. The plasma torch handle may be formed from a soft material and a hard material. Additionally, the plasma torch handle includes a thumb contour formed from the soft material and a finger contour formed from the soft material. In one embodiment, the plasma torch handle forms an angle of about 80° with the torch head. Plasma cutting systems having the plasma torch and handle are also provided.

## Claims

### Claim 1

A plasma torch, comprising:
a torch handle having a central longitudinal axis and being configured to be gripped by a hand of an operator during operation, comprising:
an enclosure having a bottom portion disposed below the central longitudinal axis and a top portion disposed above the central longitudinal axis, wherein the enclosure is formed from a first material and a second material harder than the first material;
a first contour disposed in the top portion of the enclosure and comprising a curved indentation configured to receive a thumb of the operator, wherein the first contour is formed from the first material; and
a second contour disposed in the bottom portion of the enclosure and comprising one or more curved indentations configured to receive a plurality of fingers of the operator, wherein the second contour is formed from the first material.

### Claim 2 (depends on 1)

The plasma torch of claim 1, wherein the second contour comprises a first curved indentation, a second curved indentation, and a third curved indentation, each configured to receive a finger of the operator.

### Claim 3 (depends on 1)

The plasma torch of claim 1, comprising a torch head coupled to the torch handle in a fixed position relative to the torch handle.

### Claim 4 (depends on 1)

The plasma torch of claim 1, wherein the first material comprises a thermoplastic elastomer.

### Claim 5 (depends on 1)

The plasma torch of claim 1, comprising a trigger adjacent to the second contour and formed from the second material.

### Claim 6 (depends on 3)

The plasma torch of claim 3, wherein the torch head comprises a drag shield, a retaining cup, and a torch body extending into the torch handle.

### Claim 7 (depends on 1)

The plasma torch of claim 1, wherein the first contour comprises a flared end configured to abut the thumb of the operator when the thumb of the operator is received in the curved indentation of the first contour.

### Claim 8 (depends on 1)

The plasma torch of claim 1, comprising a moveable electrode comprising a frustoconical end portion.

### Claim 9 (depends on 8)

The plasma torch of claim 8, comprising a moveable plunger configured to receive a portion of the moveable electrode, wherein the moveable plunger is biased to a first position closer to a tip of the plasma torch when the plasma torch is non-operational and moved to a second position further from the tip when the plasma torch is operational.

### Claim 10 (depends on 9)

The plasma torch of claim 9, comprising a spring configured to bias the moveable plunger to the first position.

### Claim 11 (depends on 3)

The plasma torch of claim 3, wherein the torch head includes a central longitudinal axis, and an angle between the central longitudinal axis of the torch handle and the central longitudinal axis of the torch head is fixed between approximately 71° and approximately 89°.

### Claim 12 (depends on 3)

The plasma torch of claim 3, wherein the torch head includes a central longitudinal axis, and an angle between the central longitudinal axis of the torch handle and the central longitudinal axis of the torch head is fixed at approximately 80°.

### Claim 13 (depends on 6)

The plasma torch of claim 6, wherein the drag shield is removably coupled to the retaining cup and the retaining cup is removably coupled to the torch body.

### Claim 14 (depends on 1)

The plasma torch of claim 1, comprising a strain relief component coupled to an end of the torch handle.