Pyrotechnic cut-off device

Patent metadata

Field	Value
Publication number	US-11482391-B2
Application number	US-202017597768-A
Country	US
Kind code	B2
Filing date	Jul 21, 2020
Priority date	Jul 25, 2019
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

A pyrotechnic cut-off device includes: a pyrotechnic igniter, a conductive portion and a movable piston, the piston being able to be displaced in a cavity along a direction of displacement following the actuation of the pyrotechnic igniter between a first position of passage of the current in the conductive portion and a second position of cut-off of the current, wherein the piston defines a first sealing portion having a narrowing of section along the direction of displacement, and the cavity has a wall defining a second sealing portion which extends on either side of the conductive portion and which has a narrowing of section along the direction of displacement, the first sealing portion being in contact with the second sealing portion along a contact surface extending on either side of the conductive portion when the piston is in the second position.

First claim

The invention claimed is:

1. A pyrotechnic cut-off device comprising: a pyrotechnic igniter, a conductive portion and a movable piston, the piston being able to be displaced in a cavity along a direction of displacement following the actuation of the pyrotechnic igniter between a first position of passage of the current in the conductive portion and a second position of cut-off of the current, characterized in that the piston defines a first sealing portion having a narrowing of section along the direction of displacement, and in that the cavity has a wall defining a second sealing portion which extends on either side of the conductive portion and which has a narrowing of section along the direction of displacement, the first sealing portion being in contact with the second sealing portion along a contact surface extending on either side of the conductive portion when the piston is in the second position, the first sealing portion and the second sealing portion cooperating in the second position such as to create a surface seal on either side of the conductive portion, which makes it possible to separate in a sealed manner two terminals of the device between which the conductive portion extends.

2. The device as claimed in claim 1 , wherein the sections of the piston and of the cavity are of circular or oblong shape.

3. The device as claimed in claim 1 , wherein the conductive portion is broken by impact with the piston when it passes from the first to the second position.

4. The device as claimed in claim 3 , wherein the conductive portion has at least one fragile area to facilitate the breaking of said conductive portion.

5. The device as claimed in claim 1 , wherein the first sealing portion has a first surface and the second sealing portion has a second surface, said surfaces each forming an angle between 1° and 10° with the direction of displacement of the piston.

6. The device as claimed in claim 1 , wherein a hardness of a material forming the first sealing portion and a hardness of a material forming the second sealing portion are different.

7. The device as claimed in claim 1 , wherein, in the first position, the piston defines a housing and the device further comprises a protrusion which extends from a floor of the cavity, said protrusion being housed in the housing when the piston is in the second position.

8. A secure electrical installation comprising a cut-off device as claimed in claim 1 , and an electrical circuit connected to the conductive portion of said device.

9. A vehicle comprising a secure electrical installation as claimed in claim 8 .

Assignees

• Arianegroup Sas

Inventors

• Marlin Frédéric
• Lorenzon Romain
• Brevet Lun
• Lopez Philippe

Classifications

• H01H2039/008

  using the switch for a battery cutoff · CPC title

• H01H39/006 Primary

  Opening by severing a conductor · CPC title