Temperature monitoring device containing at least one element of an alloy which memorizes its shape
First Claim
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1. A temperature monitoring device, comprising:
- a casing of a generally rectangular shape provided with two elongate chambers at right angels to one another and leading one into the other;
a motor element in said casing and comprising a spring received in a first of said chambers and composed of a shape-memorizing alloy, an end of said spring bearing against a bottom of said first chamber;
a movement transmission element operatively coupled with said motor element and including a piston against which another end of said spring bears, and a rod projecting from said piston and having an end closing an end of a second of said chambers when said spring is in a relaxed position; and
indicator means acted upon by said transmission element for irreversibly recording each overstepping of a predetermined temperature, said indicator means including balls received in said second chamber under a pressure urging said balls resiliently toward an opening of said second chamber communicating with said first chamber, said balls being adapted to be transferred to a part of said first chamber not containing said spring upon movement of said rod, said casing being formed with a transparent window over a portion thereof corresponding to said part of said first chamber to enable the presence of balls in said part to be ascertained.
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Abstract
This device comprises a casing of synthetic material containing a motor element made of at least one alloy which memorizes its shape and having associated with it a movement transmission element consisting of a piston and a rod and acting on at least one indicator element irreversibly recording each overstepping of a predetermined temperature, the casing being provided with transparent windows permitting the state of the indicator element or elements to be viewed.
18 Citations
11 Claims
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1. A temperature monitoring device, comprising:
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a casing of a generally rectangular shape provided with two elongate chambers at right angels to one another and leading one into the other; a motor element in said casing and comprising a spring received in a first of said chambers and composed of a shape-memorizing alloy, an end of said spring bearing against a bottom of said first chamber; a movement transmission element operatively coupled with said motor element and including a piston against which another end of said spring bears, and a rod projecting from said piston and having an end closing an end of a second of said chambers when said spring is in a relaxed position; and indicator means acted upon by said transmission element for irreversibly recording each overstepping of a predetermined temperature, said indicator means including balls received in said second chamber under a pressure urging said balls resiliently toward an opening of said second chamber communicating with said first chamber, said balls being adapted to be transferred to a part of said first chamber not containing said spring upon movement of said rod, said casing being formed with a transparent window over a portion thereof corresponding to said part of said first chamber to enable the presence of balls in said part to be ascertained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification