Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1990-08-01
1992-06-09
Noland, Tom
Measuring and testing
Sampler, sample handling, etc.
Capture device
7386303, 7386325, 7386333, 7386434, G01N 124
Patent
active
051196824
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention concerns personal samplers for detecting the presence of hazardous materials in a working environment, in order to ensure occupational hygiene and safety.
Stringent environmental control in the working environment is imposed to ensure that hazardous materials or conditions such as poisonous gases, micro-organisms or radioactivity, can be detected without delay. Devices to detect such hazards, known as personal samplers, usually consist of a sampling head fixed to the lapel of the user and connected by flexible tubing to a pump and battery pack carried on the back or on a belt at the waist.
These devices are cumbersome to the wearer, expensive to produce and often produce a false reading of the environmental contents at chest level which may be different from those collected in the immediately adjacent breathing zone around the nose and mouth.
An object of the present invention is to provide a personal sampler which is considerably more compact and less expensive to produce and is designed to sample the atmospheric contents as near as possible to the nose and mouth.
SUMMARY OF THE INVENTION
According to the present invention there is provided a face level sampling device comprising a suction pump, a power pack electrically connection to the suction pump, a sample head connected to the suction pump by a reformable and non-flexible tubular stalk, and means for supporting at least the suction pump and stalk on the wearer's head such that the sample head is disposed in use close to the wearer's nose and mouth thus to sample the atmospheric conditions within the breathing zone.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings in which:
FIG. 1 is a plan view of a face level sampling device as worn;
FIG. 2 is a partly cross-sectional side view of a suction pump to be supported on a headband and forming part of the device;
FIG. 3 is a part sectional side view of a sampling head forming part of the device;
FIG. 4 is a partially cut away side view of a power pack also forming part of the device.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, the sampling device comprises an adjustable headband 10 worn at forehead level and carrying a small suction pump 11 from which extends a rigid of semi-rigid tubular stalk 12 which is configured to extend past the cheek to the breathing zone immediately adjacent the wearer's nose and mouth.
Electrically connected to the suction pump is a power pack 13 to be described in further detail and adapted to drive the pump 11.
As can be seen in FIG. 2 the pump 11 in further detail consists of a motor driven impeller or fan 14 mounted in a casing 15. An electrical connector 16 (See FIGS. 1 and 4) and lead 17 supplies power from the power pack 13 to drive the pump. An inlet tube 18 for the pump is connected to a body 19 which receives a plug 20 with the interposition of a sealing ring 21. The plug 20 is held in place by a locking ring 22 and receives, coaxially as a push fit, one end of the stalk 12.
The stalk 12 is of a reformable material such as polycarbonate which can be heated and then configured or tailored to suit a particular wearer so that the free end of the stalk which carries the sample head will be positioned as close as possible to the immediate breathing zone of the wearer. This accurate location is further enhanced by the ability to rotate the plug 20 and stalk 12 after releasing locking ring 22 thus slightly to raise or lower the sampling head to bring it as close as possible to the nose and mouth.
Referring now to FIG. 3, the free end of the stalk 12 carries the sampling head which consists of a head carrier 23 into which is screwed an adaptor 24 with the interposition of a sealing ring 25. The adaptor receives as a resistance fit a sampling head 26 having a central bore coaxial with that of carrier 23 and stalk 12. The other end of head 26 where the central bore is enlarged, has removably he
REFERENCES:
patent: 3956940 (1976-05-01), Guild
patent: 4080832 (1978-03-01), Moody et al.
patent: 4589292 (1986-05-01), Delhaye et al.
patent: 4721517 (1988-01-01), Cloutier
patent: 4858476 (1989-08-01), Tobin
patent: 4961916 (1990-10-01), Lesage et al.
Noland Tom
The Victoria University of Manchester
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