US 10,760,880 B2Granted

Igniter case

AssigneeAutoliv Development AB

InventorsPatrice Boutin, Jose Reinoso, Jesse Guymon, Matthew Erni, Mason Wayment

Life of this patent

Estimating the term…

Loading patent…

Abstract

A metallic case for a pyrotechnical igniter of a gas generator for a vehicle safety device that includes a peripheral side wall, a closed end, and a weak zone in the peripheral side wall. The weak zone extends along a continuous trace having a first end portion, a second end portion, and an intermediate portion between the first and second end portions. The first and second end portions of the continuous trace both transition from a first point having a first side wall depth to a second point having a second side wall depth. The second side wall depth is greater than the first side wall depth. The weak zone is configured for opening a vent in the peripheral side wall in response to an increase of pressure within the metallic case.

Claims23

Dependent claims

A metallic case for a pyrotechnical igniter of a gas generator for a vehicle safety device, the metallic case comprising:

a peripheral side wall;
a closed end;
and
a weak zone in the peripheral side wall, the weak zone extending along a continuous trace having a first end portion, a second end portion, and an intermediate portion between the first and second end portions, the first and second end portions of the continuous trace both transitioning from a first point, having a first side wall depth, to a second point, having a second side wall depth, the second side wall depth being greater than the first side wall depth,
wherein the weak zone is configured for opening a vent in the peripheral side wall in response to an increase of pressure within the metallic case,
wherein the first and second end portions of the continuous trace both have the first side wall depth adjacent to the intermediate portion, and both transition from the first side wall depth to the second side wall depth in a direction away from the intermediate portion,
wherein the first and second end portions of the continuous trace are first and second U-shaped portions, both having a first leg proximate the intermediate portion at the first point and a second end, the depth of both of the first and second portions of the continuous trace continuously transitioning from a minimum side wall depth at the first point to a maximum side wall depth at the second end, such that the first and second end portions function to slow tearing of the peripheral side wall, as the tearing propagates from the intermediate portion of the continuous trace along the first and second end portions to thereby retain a hinged portion defining the vent.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/555,176Filed 29 Aug 2019 · continuation
Priority: 22 Jun 2017
Published: US 2019/0383589 A119 Dec 2019
Granted: 1 Sep 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B60R 21/264
Characterised by the inflation fluid source or means to control inflation fluid flow: using instantaneous generation of gas, e.g. pyrotechnic
F42B 3/198
Manufacture: of electric initiator heads e.g., testing, machines
F42B 3/04
Blasting cartridges, i.e. case and explosive: for producing gas under pressure
F42B 3/11
Initiators therefor: characterised by the material used, e.g. for initiator case or electric leads

Family

Application15/538,755Parent of this continuation · filed 22 Jun 2017
US 2019/0383589 A1Pre-grant publication · published 19 Dec 2019
US 10,584,945 B2Parent of this continuation
US 2018/0172411 A1Published application
US 10,760,880 B2This patent

From the US filing history. Foreign family members aren’t listed.