Method for manufacture of a cold-gas pyrotechnic generator

• US 5,199,155 A
• Filed: 04/30/1992
• Issued: 04/06/1993
• Est. Priority Date: 07/05/1989
• Status: Expired due to Term

• Current Assignee: Snc Livbag
• Original Assignee: Snc Livbag
• Inventors: Vavalidis, Kyriakos, Perotto, Christian, Cord, Paul-Philippe, Morner, Bengt
• Primary Examiner(s): Eley, Timothy V.
• Application Number:
  US07/876,468
• Time in Patent Office: 341 Days
• Field of Search: 29/463, 102/531, 149/2, 222/3, 280/740, 280/741, 280/737
• US Class Current: 29/463
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: F42B 3/04 for producing gas under pressure generators of inflation fluid especially adapted for vehicle air bags B60R21/26
• CPC Class Codes: Y10T 29/49893 Peripheral joining of opposed mirror image parts to form a hollow body

Abstract

A method of manufacturing a cold-gas pyrotechnic generator of the type having a casing including a base and a cover with an internal chamber accessed by a central opening for the reception of pyrotechnic elements includes the steps of placing the cover on the base with filtering material inserted, rotating the casing while introducing the pyrotechnic elements through the central opening and then inserting an ignition device in the central opening.

Claims

1. A method of manufacturing a cold-gas pyrotechnic generator of the type having a casing of revolution having a central axis, said casing being provided with outer orifices and including a base and a cover fastened together transversely, said base and said cover together forming:

an inner ignition channel for receiving an ignition device;

an annular intermediate chamber employed as a combustion chamber or containing elements of a gas-generating pyrotechnic composition;

an annular peripheral chamber employed as a cooling and filtering chamber, said peripheral chamber containing filtering means;

wherein said intermediate chamber and said peripheral chamber are in communication through intermediate orifices therebetween, and said peripheral chamber is in communication with the outside through said outer orifices, and wherein said casing defines, between said inner central ignition channel and said intermediate chamber, a lateral opening whose height is greater than the largest dimension of said elements of gas-generating pyrotechnic composition, wherein said lateral opening is continuous about said central axis, the method comprising the steps of

a) placing the filtering means in the chamber and assembling the cover with the base,

b) rotating the casing about the central axis thereof,

c) pouring the pyrotechnic composition into the lateral opening of the chamber while rotating the casing, and

d) introducing an ignition device into the inner central channel.

2. The method according to claim 1, wherein, in step a), assembling of the cover with the base is carried out by welding.

3. Method according to claim 2, characterized in that the welding is obtained by friction.

4. The method as claimed in claim 1, wherein step b) is carried out by fastening the casing on a horizontal-spindle lathe.

5. Method according to claim 4, characterized in that the speed of rotation of the casing (2) during loading is greater than 100 revolutions per minute.

6. Method according to claim 5, characterized in that, during loading, the casing (2) is subjected to vibrations.