Thermal measuring and testing – Temperature measurement – Mechanical
Patent
1990-06-01
1991-05-28
Cuchlinski, Jr., William A.
Thermal measuring and testing
Temperature measurement
Mechanical
116216, 116221, 374104, G01K 300, G01K 102
Patent
active
050188747
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application of PCT/FR89/00510 filed 3 Oct. 1989 and based, in turn, upon French national application 8813245 of October 1988.
1. Field of the Invention
The present invention relates to a temperature monitoring device containing at least one element of an alloy which memorized its shape.
2. Background of the Invention
In numerous fields it is necessary to record the temperature variations to which a product is subjected, e.g. in cases where, depending on circumstances, one or more variations or the overstepping of predetermined temperatures could make the product unsuitable for subsequent use.
One common example relates to the field of foodstuffs, where it is necessary to check continuously the quality of the cold of perishable produce: fresh, deep-frozen and frozen products, or foods which must be kept at a certain temperature.
It is however not exceptional for such products, in the course of the various manipulations to which they are subjected, to exceed a predetermined temperature above which they may be damaged.
It is also important to check continuously the quality of the cold supplied by equipment producing or maintaining cold, such as refrigerators or freezers, since an operating fault may result in a rise in temperature injurious to the products contained in them.
It is also necessary to maintain a continuous quality check on sterilization processes, in respect of both the products sterilized and the sterilization equipment.
Where health is concerned, it is necessary to maintain a continuous check on the conditions of preservation of blood or products derived from blood, biological and biogenetic products or certain pharmaceutical products for which temperatures must be strictly respected.
In the medical field, it is also necessary to maintain a continuous check on transplant organs and animal and human gametes.
In the industrial filed, it is also desirable to monitor the operating temperature of certain machine parts, the manufacturing temperature of certain components, particularly electronic components, and also the storage temperature of various materials, such as composite materials or photographic emulsions, for example.
In addition, in the industrial field, temperature variations ar in certain cases accompanied by variations of pressure which it is necessary to check continuously; for example pressure pipes monitored with the aid of instrumented values.
It is therefore important to have available a simple, reliable device capable of being attached to the product and/or machines and of indicating by direct reading the overstepping of a determined temperature.
French Patent No. 2 560 992 in the name of the Applicant relates to a device in which the overstepping of a determined temperature is indicated by an irreversible coloration triggered with the aid of an element made of an alloy which memorized its shape.
Object of the Invention
The object of the present invention is therefore to provide a device, made of an alloy which memorized its shape, which enables temperatures to be monitored:
is capable of detecting a plurality of oversteppings of the temperature, while storing the number of oversteppings;
is capable of having a variable response time ("delay time") on each of the temperature thresholds, which is at present not the case for all devices, including that of French Patent No. 2 560 992;
includes a tamper proof system for the display of each of the temperature thresholds;
operates in all positions;
is resistant to shocks, vibrations, radiation and corrosion;
can be produced and stored at ambient temperature whatever the utilization temperatures; and
is self-activating on passing through the different temperature thresholds.
SUMMARY OF THE INVENTION
To this end, the device to which the invention relates comprises a casing of synthetic material containing a motor element made of at least one alloy which memorized its shape and having associated with it a movement transmission element consisting of a pisto
REFERENCES:
patent: 3290942 (1966-12-01), Carbaugh
patent: 4634021 (1987-11-01), Davis
patent: 4664056 (1987-05-01), Jehanno
Cuchlinski Jr. William A.
Dubno Herbert
G.I.R.
Rhoa Joseph A.
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