Patent ID: 7634965

Claim:
A pyrotechnical device of ignition delay between a fuse or an igniter and a device to be ignited, comprising: a first element defining a first space receiving at least one fuse or one igniter; a second element communicating through an orifice with a second space receiving the device to be ignited, the first or second element being able to slide with respect to the second or first element; and a groove formed in the outer surface of the first element and/or the inner surface of the second element, and communicating with the first space through a communicating portion of the first space and with the second space through said orifice irrespective of relative operational positions between the first and the second elements, wherein a regularly burning flammable material is arranged on an external wall of the first element and/or on an internal wall of the second element and contained in said groove, wherein the duration of ignition delay varies according to the groove length between the communicating portion and the orifice, the groove length being defined by relative positions of the first and the second elements.