# US 7,743,647 B1 · Orifice test device for protective mask testers

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- Number: US 7,743,647 B1
- Document ID: US7743647B1
- Status: Granted
- Kind: B1
- Application number: 12/195,814
- Filed: 2008-08-21
- Granted: 2010-06-29
- Earliest claimed: 2006-08-31
- Assignees: The United States of America as represented by the Secretary of the Army
- Inventors: Joshua D. Israel; Corey L. Piepenburg; Malcolm D. Goodman
- Web page: https://patentgrep.com/patent/US7743647B1

## CPC

- G01N 15/06: Investigating concentration of particle suspensions (by weighing G01N5/00; investigating sedimentation of particle suspensions G01N15/04; investigating individual particles G01N15/10)
- A62B 27/00: Methods or devices for testing respiratory or breathing apparatus {for high altitudes}(apparatus for testing gastightness in general G01M)
- G01N 15/075: by optical means
- G01N 2001/2223: {aerosol sampling devices}
- G01N 2015/019: {Biological contaminants; Fouling}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00)

## Abstract

An orifice test calibration device tests the functionality of protective mask testers. The orifice test calibration device has a semi-rigid tubular channel with one end for sealing the flow outlet port of the protective mask tester and a second end for sealing the vacuum inlet port of the protective mask tester. The device also includes a sealable opening within the tubular channel and an insertable orifice plug having a set diameter for insertion into the sealable opening in order to calibrate the protective mask tester.

## Claims

### Claim 1

An orifice test calibration device for testing the functionality of a protective mask tester, comprising:
a semi-rigid tubular channel having a first end effective for sealing a mask head piece flow port and a second end effective for sealing a mask head piece vacuum port of said protective mask tester;
a sealable opening within the tubular channel;
an insertable orifice plug for insertion into the sealable opening, wherein the orifice plug has a set opening diameter; and
wherein said first end is sealably inserted into the flow port of said protective mask tester, and said second end is sealably inserted into the vacuum port of said protective mask tester.

### Claim 2 (depends on 1)

The orifice test calibration device of claim 1, wherein the semi-rigid tubular channel flexes across a range of from about 1 inch to about 3 inches.

### Claim 3 (depends on 1)

The orifice test calibration device of claim 1, further comprising rubber stopper inserts at the first end and the second end of said tubular channel.

### Claim 4 (depends on 1)

The orifice test calibration device of claim 1, wherein the semi-rigid tubular channel comprises a longitudinally rigid composition effective for inserting the first end and second end into fixed holes for an air-tight seal.

### Claim 5 (depends on 1)

The orifice test calibration device of claim 1, wherein said orifice plug comprises a blank orifice plug having no opening and insertable into the sealable opening.

### Claim 6 (depends on 1)

The orifice test calibration device of claim 1, wherein the set opening diameter ranges from about 20 microns to about 150 microns.

### Claim 7 (depends on 1)

The orifice test calibration device of claim 1, wherein the set opening diameter ranges from about 30 microns to about 40 microns.

### Claim 8 (depends on 1)

The orifice test calibration device of claim 1, wherein the sealable opening further comprises a cap device for sealing said opening.

### Claim 9 (depends on 8)

The orifice test calibration device of claim 8, wherein the cap device has an opening large enough to insert the orifice plug therein.

### Claim 10 (depends on 1)

The orifice test calibration device of claim 1, further comprising an o-ring within the sealable opening.

### Claim 11 (depends on 10)

The orifice test calibration device of claim 10, wherein the o-ring seals the area between the insertable orifice plug and the tubular channel.