US4592661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat stress monitor
Assignee: Dobbie Instruments Australia Pty Ltd
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Filing: 1984-11-16
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Granted: 1986-06-03
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Expires: 2004-11-16
Abstract
Abstract A heat stress monitor comprised of a thermometer tube having at least a black globe-bulb and a wet-bulb therein and adapted to provide a direct reading of wet-bulb globe temperature (WBGT). The inclusion in the tube of a dry-bulb makes the monitor particularly adapted to measuring WBGT outdoors. The thermometer tube is in the form of a single tube and the bulbs are disposed in series therein with an extension part extending beyond the bulbs to permit a direct reading to be taken of the position of a thermally responsive medium in the tube.
Inventors
- 👤 Bruce L. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:31
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/56; G01N25/62; G01W; G01W1/00; G01W1/17
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
197 words
A heat stress monitor comprising a thermometer tube shaped generally in a shallow U configuration and having a black globe-bulb on one free arm thereof and a wet-bulb on the other free arm thereof, there being an interconnection across the base of the U between the bulbs so as to connect said bulbs in series, a black globe for receiving the black globe-bulb and means capable of moistening the surface of the wet-bulb, the thermometer tube being adapted to provide a direct reading of wet-bulb globe temperature, and a common thermally responsive medium in the tube which medium extends from the wet-bulb through the tube into the black globe-bulb and beyond said black globe-bulb into an extension part of the tube which extends substantially parallel with the base of the U and is provided to permit a reading to be taken of the position of the thermally responsive medium, the internal volumes of the black globe-bulb and the wet-bulb being respectively proportional to the percentages of the black globe temperature and of the wet-bulb temperature required for determining the wet-bulb globe temperature whereby the position of the thermally responsive medium is indicative of the wet-bulb globe temperature.
Claim 2
Dependent Claim
197 words
A heat stress monitor comprising a thermometer tube shaped generally in a shallow U configuration and having a black globe-bulb on one free arm thereof and a wet-bulb on the other free arm thereof, there being an interconnection across the base of the U between the bulbs so as to connect said bulbs in series, a black globe for receiving the black globe-bulb and means capable of moistening the surface of the wet-bulb, the thermometer tube being adapted to provide a direct reading of wet-bulb globe temperature, and a common thermally responsive medium in the tube which medium extends from the wet-bulb through the tube into the black globe-bulb and beyond said black globe-bulb into an extension part of the tube which extends substantially parallel with the base of the U and is provided to permit a reading to be taken of the position of the thermally responsive medium, the internal volumes of the black globe-bulb and the wet-bulb being respectively proportional to the percentages of the black globe temperature and of the wet-bulb temperature required for determining the wet-bulb globe temperature whereby the position of the thermally responsive medium is indicative of the wet-bulb globe temperature.
Claim 3
Dependent Claim
44 words
A heat stress monitor according to claim 1 wherein the thermometer tube is secured in a housing from which the wet-bulb and black globe-bulb project respectively inside the moistening means and the black globe and the extension part is visible externally of the housing.
Claim 4
Dependent Claim
21 words
A heat stress monitor according to claim 2 wherein the extension part is mounted on an external surface of the housing.
Claim 5
Dependent Claim
31 words
A heat stress monitor according to claim 2 wherein the moistening means comprises a cup mounted in the housing and a liquid absorbent sheath extending from the cup around the wet-bulb.
Claim 6
Dependent Claim
185 words
A heat stress monitor comprising a thermometer tube having a black globe-bulb, a dry-bulb and a wet-bulb therein, a black globe for receiving the black globe-bulb, means protecting the dry-bulb from direct solar radiation and means capable of moistening the surface of the wet-bulb, the thermometer tube being adapted to provide a direct reading of wet-bulb globe temperature, and wherein the thermometer tube comprises a single tube with the bulbs disposed in series therein and a common thermally responsive medium in the tube which medium extends from the wet-bulb, serially through the tube, through the dry-bulb and into the black globe-bulb and beyond said black globe-bulb into an extension part of the tube which is provided to permit a reading to be taken of the position of the thermally responsive medium, the internal volumes of the black globe-bulb, the dry-bulb and the wet-bulb being respectively proportional to the percentages of the black globe temperature, of the dry-bulb temperature and of the wet-bulb temperature required for determining the wet-bulb globe temperature whereby the position of the thermally responsive medium is indicative of the wet-bulb globe temperature.
Claim 7
Dependent Claim
185 words
A heat stress monitor comprising a thermometer tube having a black globe-bulb, a dry-bulb and a wet-bulb therein, a black globe for receiving the black globe-bulb, means protecting the dry-bulb from direct solar radiation and means capable of moistening the surface of the wet-bulb, the thermometer tube being adapted to provide a direct reading of wet-bulb globe temperature, and wherein the thermometer tube comprises a single tube with the bulbs disposed in series therein and a common thermally responsive medium in the tube which medium extends from the wet-bulb, serially through the tube, through the dry-bulb and into the black globe-bulb and beyond said black globe-bulb into an extension part of the tube which is provided to permit a reading to be taken of the position of the thermally responsive medium, the internal volumes of the black globe-bulb, the dry-bulb and the wet-bulb being respectively proportional to the percentages of the black globe temperature, of the dry-bulb temperature and of the wet-bulb temperature required for determining the wet-bulb globe temperature whereby the position of the thermally responsive medium is indicative of the wet-bulb globe temperature.
Claim 8
Dependent Claim
98 words
A heat stress monitor according to claim 5 wherein the thermometer tube is shaped generally in a shallow U configuration, with the wet-bulb being on one free arm thereof and the black globe-bulb being on the other free arm thereof, there being an interconnection across the base of the U between said bulbs and incorporating the dry-bulb, and wherein said extension part of the thermometer tube for providing the wet-bulb globe temperature measurement extends substantially parallel with the base of the U and is an extension of the free arm of the U which contains the black globe-bulb.
Claim 9
Dependent Claim
44 words
A heat stress monitor according to claim 5 wherein the thermometer tube is secured in a housing from which the wet-bulb and black globe-bulb project respectively inside the moistening means and the black globe and the extension part is visible externally of the housing.
Claim 10
Dependent Claim
21 words
A heat stress monitor according to claim 7 wherein the extension part is mounted on an external surface of the housing.
Claim 11
Dependent Claim
31 words
A heat stress monitor according to claim 7 wherein the moistening means comprises a cup mounted in the housing and a liquid absorbent sheath extending from the cup around the wet-bulb.
Claim 12
Dependent Claim
36 words
A heat stress monitor according to claim 7 which includes an enlarged opening in the housing and adapted to receive the dry-bulb therein and air permeable closure means preventing entry of incipient radiation to the opening.
Claim 13
Dependent Claim
20 words
A heat stress monitor according to claim 10 in which the closure means comprises a pair of overlying louvered panels.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |