 DC power switch with inrush prevention |
| OF THE PREFERRED EMBODIMENTS Referring now to FIG. 1, the circuitry for a DC power switch 10 is ... |
|
| Voltage reference circuit |
| The present invention resides in one aspect in using a bandgap reference circuit to generate the ... |
|
| Self adjusting data detector |
| Accordingly, it is an object of the present invention to provide an improved data detector which ... |
|
| Method and apparatus for calibrating a multi-bit delta-sigma modular |
| The present invention disclosed and claimed herein comprises a method and apparatus for ... |
|
| Digital to analog converter for sigma delta modulator |
| In accordance with the present invention, a digital to analog converter is provided which ... |
|
| Digital-to-analog converter with digital linearity correction |
| In accordance with a basic aspect of the present invention, there is provided a method of operating ... |
|
| Pulse generating circuit for dynamic random access memory device |
| Accordingly, the present invention is directed to a pulse generating circuit for dynamic random ... |
|
| Low voltage latch with uniform stack height |
| According to one embodiment of the invention, latch components are comprised of low threshold ... |
|
| Remote controlled thermostat |
| OF THE PREFERRED EMBODIMENT The present invention is a method and apparatus for remotely adjusting ... |
|
|
Device for detecting the exceeding of a temperature threshold
| Details |
Inventors: Toupin, Joseph F.; Douesnel, Xavier;
Assignee:
Primary Examiner: Swann, III; Glen R.
Assistant Examiner: Mullen, Jr.; Thomas J.
Attorney, Agent or Firm: Meller; Michael N.
Device for detecting the exceeding of a temperature threshold incorporating a first mobile part (5) in a sealed chamber (4) containing a material melting at the temperature of the threshold and a second mobile part (8) outside the chamber. In the armed position, the two parts exert forces on one another tending to move them apart, but the first part is blocked by the solidified material and the second is immobilized by the combination of shapes (12, 13) in case (9). The melting of the material frees the first part, whose displacement frees the second part, which then operates an alarm system (18). This displacement leads to the return of the first part to the initial position, which permits rearming when the material has resolidified. |
|
DETAILED DESCRIPTION In order to obtain this result the invention provides a device for detecting the exceeding of a temperature threshold having a first part, which can move within a sealed chamber containing a temperature which melts or softens at the temperature of the threshold and a second part able to exert on the first part a magnetic force, at least when said first part is in a first position, so that a melting of said material leads to the displacement of the first part towards a second position.
This device has the special feature that the displacement of the first part during the melting of the material leads to a correlative displacement of the second part from a third to a fourth position, said displacement causing the actuation of alarm means and in the fourth position the second part exerts on the first part a magnetic force returning the first part to its initial position.
Advantageously, the first and second parts, when they are both in their initial position, exert magnetic forces on one another, the force being exerted on the second part immobilizing the latter in the third position by the combination of shapes with a fixed support.
Moreover, when the first part passes into its second position, the magnetic force to which the second part has been subject decreases and enables said second part to pass into the fourth position under the effect of the elastic means and when the second part is in the fourth position, it exerts on the first part a magnetic force in the reverse direction, which tends to bring said first part into said first position.
It is clear that if, by a specific voluntary operation, the second part is moved towards the third position, two cases can occur.
Thus, the material of the sealed chamber is still liquid and in this case the first part will pass again to its second position and it will be impossible to immobilize the second part, or the material has resolidified and in this case the first part remains in its first position and the device is rearmed in the manner of a multi-shot pistol
|
|
Coded 
